<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0535-5133</journal-id>
<journal-title><![CDATA[Investigación Clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. clín]]></abbrev-journal-title>
<issn>0535-5133</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Investigaciones Clínicas "Dr. Américo Negrette", Facultad de Medicina, Universidad del Zulia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0535-51332008000400011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[P53 y su papel en el epitelio superficial del ovario: Revisión]]></article-title>
<article-title xml:lang="en"><![CDATA[p53 and its role in the ovarian surface epithelium: A review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chuaire-Noack]]></surname>
<given-names><![CDATA[Lilian]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Corredor]]></surname>
<given-names><![CDATA[Magda Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Clavijo]]></surname>
<given-names><![CDATA[Sandra]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Rosario Facultad de Medicina Departamento de Ciencias Básicas]]></institution>
<addr-line><![CDATA[Bogotá DC]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2008</year>
</pub-date>
<volume>49</volume>
<numero>4</numero>
<fpage>561</fpage>
<lpage>593</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0535-51332008000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0535-51332008000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0535-51332008000400011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El epitelio superficial del ovario (ESO), tejido formado por una sola capa de células, está sujeto a una elevada tasa de renovación en el sitio de la ruptura provocada por la ovulación, lo que ha sido asociado con un mayor riesgo de desarrollar cáncer como consecuencia de la transformación maligna de sus células. El hallazgo de un 90% de tumores ováricos derivados del epitelio superficial, así como de mutaciones del gen p53 en la gran mayoría de ellos, constituyen la justificación para revisar la estructura y la histogénesis de dicho tejido con referencia a p53. Igualmente se consideran algunos aspectos relacionados con la estabilización de la proteína, su regulación, su participación en eventos claves como detención del ciclo celular, inducción de apoptosis, la etiología y patogénesis del cáncer ovárico epitelial y por último, algunos de los más recientes avances farmacogenéticos que utilizan a p53 como blanco terapéutico contra el cáncer.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The ovarian surface epithelium (OSE) is a single layer of cells subject to a high rate of turnover at the site of follicular rupture at ovulation and this results in a higher risk of malignant cell transformation. Findings like cancer derived from OSE, that accounts for approximately 90% of all human ovarian malignancies and the frequent mutations of the p53 gen in most of them, are the basis for reviewing OSE structure and histogenesis related to p53, as well as some aspects associated with p53 stabilization and regulation, its involvement in key events like cell cycle arrest, induction of apoptosis, etiology and pathogenesis of epithelial ovarian cancer. Finally, this review takes into account recent farmacogenetics advances in order to use p53 as a target in the therapy against cancer.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Señalización celular]]></kwd>
<kwd lng="es"><![CDATA[histogénesis]]></kwd>
<kwd lng="es"><![CDATA[ciclo celular]]></kwd>
<kwd lng="es"><![CDATA[apoptosis]]></kwd>
<kwd lng="es"><![CDATA[patogénesis]]></kwd>
<kwd lng="es"><![CDATA[quimioterapia]]></kwd>
<kwd lng="es"><![CDATA[cáncer ovárico epitelial]]></kwd>
<kwd lng="en"><![CDATA[Cell signaling]]></kwd>
<kwd lng="en"><![CDATA[histogenesis]]></kwd>
<kwd lng="en"><![CDATA[cell cycle]]></kwd>
<kwd lng="en"><![CDATA[apoptosis]]></kwd>
<kwd lng="en"><![CDATA[pathogenesis]]></kwd>
<kwd lng="en"><![CDATA[chemotherapy]]></kwd>
<kwd lng="en"><![CDATA[epithelial ovarian cancer]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <BASEFONT SIZE="3"> <MULTICOL GUTTER="31" COLS="2">     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><font color="#1f1a17" face="Verdana" size="3">p53 y su papel en el epitelio superficial del ovario. Revisi&#243;n.&nbsp;</font></B> </P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><b><font face="Verdana" size="2"><FONT COLOR="#1f1a17"> Lilian Chuaire-Noack </FONT><font color="#1F1A17"><sup>1</sup></font><FONT COLOR="#1f1a17">, Magda Carolina S&#225;nchez-Corredor </FONT><font color="#1F1A17"><sup>1</sup></font><FONT COLOR="#1f1a17"> y Sandra Ram&#237;rez-Clavijo </FONT><font color="#1F1A17"><sup>1</sup></font><FONT COLOR="#1f1a17">.&nbsp; </FONT></font></b></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2" color="#1F1A17"><sup>1</sup></font><FONT COLOR="#1f1a17" size="2" face="Verdana">  Departamento de Ciencias B&#225;sicas, Facultad de Medicina, Universidad del  Rosario, Bogot&#225; DC, Colombia.</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font color="#1f1a17" face="Verdana" size="2">Autor de correspondencia: Lilian Chuaire-Noack. Facultad de Medicina, Universidad del Rosario, Carrera 24 63C-69 Quinta Mutis. Bogotá DC, Colombia. Tel: 571- 3474570 ext 276/503. Correo electrónico: lchuaire@urosario.edu.co&nbsp;</font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> Resumen</FONT></B></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana">El epitelio superficial del ovario (ESO), tejido formado por una  sola capa de c&#233;lulas, est&#225; sujeto a una elevada tasa de renovaci&#243;n en el  sitio de la ruptura provocada por la ovulaci&#243;n, lo que ha sido asociado  con un mayor riesgo de desarrollar c&#225;ncer como consecuencia de la transformaci&#243;n  maligna de sus c&#233;lulas. El hallazgo de un 90% de tumores ov&#225;ricos derivados  del epitelio superficial, as&#237; como de mutaciones del gen p53 en la gran  mayor&#237;a de ellos, constituyen la justificaci&#243;n para revisar la estructura  y la histog&#233;nesis de dicho tejido con referencia a p53. Igualmente se consideran  algunos aspectos relacionados con la estabilizaci&#243;n de la prote&#237;na, su  regulaci&#243;n, su participaci&#243;n en eventos claves como detenci&#243;n del ciclo  celular, inducci&#243;n de apoptosis, la etiolog&#237;a y patog&#233;nesis del c&#225;ncer  ov&#225;rico epitelial y por &#250;ltimo, algunos de los m&#225;s recientes avances farmacogen&#233;ticos  que utilizan a p53 como blanco terap&#233;utico contra el c&#225;ncer.</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Palabras clave:&nbsp;</FONT></B><FONT COLOR="#1f1a17">Se&#241;alizaci&#243;n celular, histog&#233;nesis, ciclo celular, apoptosis, patog&#233;nesis,  quimioterapia, c&#225;ncer ov&#225;rico epitelial&nbsp; </FONT></font></P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> p53 and its role in the ovarian surface epithelium. A review.</FONT></B></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> Abstract</FONT></B></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana">The ovarian surface epithelium (OSE) is a single layer of cells  subject to a high rate of turnover at the site of follicular rupture at  ovulation and this results in a higher risk of malignant cell transformation.  Findings like cancer derived from OSE, that accounts for approximately  90% of all human ovarian malignancies and the frequent mutations of the  p53 gen in most of them, are the basis for reviewing OSE structure and  histogenesis related to p53, as well as some aspects associated with p53  stabilization and regulation, its involvement in key events like cell cycle  arrest, induction of apoptosis, etiology and pathogenesis of epithelial  ovarian cancer. Finally, this review takes into account recent farmacogenetics  advances in order to use p53 as a target in the therapy against cancer.</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"><B><FONT COLOR="#1f1a17">Key words:&nbsp;</FONT></B><FONT COLOR="#1f1a17">Cell signaling, histogenesis, cell cycle, apoptosis, pathogenesis, chemotherapy,  epithelial ovarian cancer</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"><b><FONT COLOR="#1f1a17"> Recibido:</FONT></b><FONT COLOR="#1f1a17">  12-11-2007. <b> Aceptado:</b> 24-04-2008.</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> INTRODUCCI&#211;N&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> p53 es quiz&#225;s el gen m&#225;s estudiado en las &#250;ltimas d&#233;cadas, desde cuando  en 1979 fue identificado y descrito en c&#233;lulas transformadas por el virus  SV40, donde se encontr&#243; que su prote&#237;na formaba un complejo con el ant&#237;geno  T oncog&#233;nico producido por el virus (1). Con el advenimiento de la era  de la biolog&#237;a molecular, qued&#243; demostrado su papel como inhibidor de la  proliferaci&#243;n y como promotor de la muerte celular bajo condiciones de  estr&#233;s (2, 3).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las mutaciones de p53 constituyen el cambio gen&#233;tico m&#225;s frecuente en el  c&#225;ncer, lo que hace que la alteraci&#243;n de sus funciones como regulador del  ciclo celular y de la apoptosis favorezca el crecimiento descontrolado  de las c&#233;lulas tumorales (4). Las mutaciones est&#225;n presentes en la mitad  de las neoplasias humanas (5) y, en particular, en 40-80% de los tumores  malignos de origen epitelial ov&#225;rico (6-8). Si se tiene en cuenta que en  un 90-95%, &#233;stos se originan a partir del epitelio superficial del ovario  y son adem&#225;s responsables de cerca de la mitad de las muertes asociadas  con neoplasias ginecol&#243;gicas (9-11), p53 emerge con un papel protag&#243;nico  dentro del contexto normalidad-malignidad del tejido. Este hecho, sumado  a la pobre comprensi&#243;n de la biolog&#237;a del epitelio superficial del ovario,  as&#237; como de la etiolog&#237;a y los eventos moleculares tempranos de la progresi&#243;n  tumoral, ha determinado en gran parte el curso tomado en tal sentido por  la investigaci&#243;n en el campo de la oncog&#233;nesis ov&#225;rica en los &#250;ltimos a&#241;os.&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El objetivo de la presente revisi&#243;n est&#225; por tanto centrado en la recolecci&#243;n,  an&#225;lisis y discusi&#243;n de algunos de los principales hallazgos relacionados  con la participaci&#243;n de p53 en procesos como la proliferaci&#243;n y diferenciaci&#243;n  del epitelio superficial del ovario, su transformaci&#243;n hacia la malignidad  y los sistemas de se&#241;alizaci&#243;n que intervienen en todos ellos.&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> HISTOG&#201;NESIS DEL EPITELIO SUPERFICIAL DEL OVARIO Y p53&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El epitelio superficial del ovario surge en una etapa temprana del desarrollo  embrionario, a partir del epitelio de origen mesod&#233;rmico que recubre a  la futura g&#243;nada. All&#237; prolifera, se diferencia y, conjuntamente con el  mes&#233;nquima subyacente, hacia la s&#233;ptima semana de desarrollo da origen  al blastema ov&#225;rico (12).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Hasta el quinto mes de la vida prenatal, su estructura es la de un epitelio  simple plano o c&#250;bico. A partir de ese instante, cambia a uno estratificado  hasta el momento del nacimiento, cuando es reemplazado por un epitelio  simple (10, 12). Este proceso parece depender de est&#237;mulos intragonadales  hormonales de tipo esteroide, pues ocurre en forma simult&#225;nea con la diferenciaci&#243;n  esteroidea de las c&#233;lulas del estroma ov&#225;rico (10). De manera semejante  a lo que ocurre con otros tejidos, la expresi&#243;n de p53 en la histog&#233;nesis  de ESO est&#225; correlacionada en forma inversa con el grado de diferenciaci&#243;n  alcanzado (13, 14), de modo que, si bien se expresa en las primeras semanas  del primer trimestre de desarrollo gonadal, hacia las semanas 6 a 12 su  expresi&#243;n disminuye en forma considerable, en simultaneidad con un aumento  en la expresi&#243;n de la prote&#237;na Bcl-2 antiapopt&#243;tica. Este hecho posiblemente  contribuye a una r&#225;pida proliferaci&#243;n de las c&#233;lulas epiteliales, las que  al rodear a las oogonias constituyen un entorno apropiado para el desarrollo  ulterior de los fol&#237;culos (15, 16).</FONT></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Con una participaci&#243;n crucial de la v&#237;a de se&#241;alizaci&#243;n en la que interviene  la mol&#233;cula Wnt-4, aparece en el embri&#243;n el epitelio superficial del ovario,  originado a su vez a partir del epitelio cel&#243;mico que reviste tambi&#233;n a  los conductos de M&#252;ller, precursores de oviducto, endometrio y endoc&#233;rvix  (17). As&#237;, ESO no s&#243;lo comparte id&#233;ntico origen embrionario con el resto  del mesotelio extraov&#225;rico, sino que est&#225; expuesto al mismo medio ambiente  p&#233;lvico, lo que puede explicar la asociaci&#243;n de ambos tejidos con el carcinoma  epitelial ov&#225;rico (10). De hecho, las neoplasias derivadas de ESO contienen  c&#233;lulas de tipo m&#252;lleriano, como por ejemplo c&#233;lulas serosas, mucinosas,  endometrioides y claras, lo que aporta evidencia a la hip&#243;tesis de un origen  embrionario com&#250;n (18). No obstante, los dos tejidos difieren en algunas  caracter&#237;sticas, como la expresi&#243;n de ciertos marcadores de diferenciaci&#243;n  en el peritoneo m&#252;lleriano, ausentes en el epitelio superficial normal  del ovario. Esto ha llevado a pensar que ESO retiene la capacidad del reborde  epitelial mesod&#233;rmico, lo que le permite diferenciarse bajo ciertas condiciones  patol&#243;gicas, y determina adem&#225;s que en el carcinoma derivado de este tejido  se expresen marcadores de diferenciaci&#243;n epitelial propios de neoplasias  tanto ov&#225;ricas, como derivadas del conducto de M&#252;ller. Es el caso de la  glicoprote&#237;na CA125, caracter&#237;stica de la superficie de las c&#233;lulas de  todas las serosas y de las c&#233;lulas epiteliales de oviducto, endometrio  y endoc&#233;rvix, pero no de ESO normal, en donde no se ha identificado, ya  sea porque su expresi&#243;n es un evento muy temprano en el desarrollo o simplemente  no se expresa (19-22). Al respecto, se ha detectado la expresi&#243;n de CA125  en cultivos de c&#233;lulas epiteliales ov&#225;ricas con da&#241;o del ADN y expresi&#243;n  deficiente de p53 (23). Otro marcador de diferenciaci&#243;n raramente expresado  en ESO normal, pero com&#250;n en el epitelio m&#252;lleriano y en los carcinomas  primarios derivados de ESO, es la E-cadherina, prote&#237;na transmembranal  dependiente de calcio que act&#250;a como inductora del fenotipo epitelial,  durante la histog&#233;nesis y la estabilizaci&#243;n de los tejidos (24, 25). Gracias  a la uni&#243;n entre sus dominios extracelulares hom&#243;logos, la E-cadherina  promueve la adhesi&#243;n de c&#233;lulas adyacentes, mientras que a trav&#233;s de su  dominio intracelular se acopla con las cateninas <FONT COLOR="#1f1a17">a, b y g, prote&#237;nas de  adhesi&#243;n que tambi&#233;n se unen a la F-actina, para formar uniones intercelulares  adherentes en la membrana plasm&#225;tica lateral (24).&nbsp;</FONT> </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> A medida que transcurre la diferenciaci&#243;n de ESO, disminuye la expresi&#243;n  de la E-cadherina, al parecer debido a la regulaci&#243;n hormonal ejercida  por estr&#243;genos y progesterona (26), hasta su inhibici&#243;n total en el ovario  postnatal. La disminuci&#243;n se inicia por la acci&#243;n de se&#241;ales de tipo morfog&#233;nico  que no s&#243;lo promueven la translocaci&#243;n de la <FONT COLOR="#1f1a17">b-catenina al n&#250;cleo sino  que tambi&#233;n inducen la transici&#243;n mes&#233;nquima-epitelio, necesaria para que  ocurran la migraci&#243;n y la reorganizaci&#243;n tisular propia de la embriog&#233;nesis.  En presencia de mutaciones de p53 en ESO, se ha demostrado que la b-catenina  se acumula en el n&#250;cleo, y esto se asocia no s&#243;lo con la expresi&#243;n aberrante  de la E-cadherina y la aparici&#243;n de un fenotipo mesenquim&#225;tico, sino tambi&#233;n  con una mayor capacidad de invasi&#243;n del carcinoma primario (27-29), eventos  que tambi&#233;n pueden ocurrir cuando existen mutaciones en los genes que codifican  para E-cadherina o b-catenina (24). Por este motivo, se encuentran niveles  elevados de E-cadherina en ESO metapl&#225;sico y en carcinomas primarios derivados  de ESO, pero no en ESO normal ni en carcinomas metast&#225;sicos, donde su expresi&#243;n  es indetectable (29, 30).</FONT></FONT></P> <MULTICOL GUTTER="31" COLS="2">     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las c&#233;lulas del epitelio superficial del ovario tienen forma aplanada o  c&#250;bica y se disponen en un solo estrato que descansa sobre una l&#225;mina basal.  Esta a su vez, separa al epitelio de la t&#250;nica albug&#237;nea, gruesa capa de  tejido conectivo denso colagenoso (12). En forma paralela con el envejecimiento,  el ovario tiende a adoptar un contorno irregular que determina que en la  corteza del &#243;rgano aparezcan invaginaciones y quistes de inclusi&#243;n de origen  epitelial. Estos eventos est&#225;n acompa&#241;ados por cambios metapl&#225;sicos, como  la sustituci&#243;n del epitelio c&#250;bico por uno cil&#237;ndrico (31). En las c&#233;lulas  epiteliales de los quistes de inclusi&#243;n se han identificado formas mutantes  de p53, as&#237; como inhibici&#243;n de la expresi&#243;n de BRCA1, usualmente debida  a metilaci&#243;n del promotor (32). Por estos hallazgos se ha postulado que  los quistes de inclusi&#243;n est&#225;n asociados con metaplasias y neoplasias,  en consideraci&#243;n a que se presentan en mujeres con historia familiar de  c&#225;ncer ov&#225;rico, y a que por otra parte, las c&#233;lulas epiteliales involucradas  expresan CA125 y E-cadherina, marcadores propios del epitelio m&#252;lleriano  (33).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> ESTRUCTURA Y FUNCI&#211;N DE LA PROTE&#205;NA p53&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La prote&#237;na humana p53 est&#225; involucrada en un amplio espectro de eventos  celulares que van desde la regulaci&#243;n de glic&#243;lisis y autofagia, reparaci&#243;n  del da&#241;o del ADN, supervivencia celular y regulaci&#243;n del estr&#233;s oxidativo,  angiog&#233;nesis, diferenciaci&#243;n, proliferaci&#243;n, muerte y senescencia celular,  hasta la remodelaci&#243;n &#243;sea (34-42). Para ello, interact&#250;a directamente  con el ADN (como factor de transcripci&#243;n) y con una panoplia de prote&#237;nas,  adem&#225;s de ser el blanco de variadas v&#237;as de se&#241;alizaci&#243;n, a trav&#233;s de las  cuales se regula su actividad.</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La prote&#237;na p53 tiene cinco dominios (<a href="#fig1">Fig. 1</a>):</FONT></P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><a name="fig1"><img border="0" src="/img/fbpe/ic/v49n4/art11fig1.jpg" align="center" width="506" height="318"></a></P>     
<P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font SIZE="2" COLOR="#231f20" face="Verdana"><b>Fig. 1. </b>Estructura de p53.</font></P> <UL>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Dominio de transactivaci&#243;n, entre los amino&#225;cidos 1 y 42 del extremo amino-terminal,  a trav&#233;s del cual interact&#250;a con la prote&#237;na mdm2. Contiene una regi&#243;n  de alta conservaci&#243;n evolutiva HCDI.</FONT></LI> <MULTICOL GUTTER="31" COLS="2">     ]]></body>
<body><![CDATA[<LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Dominio rico en prolina, conservado en la mayor&#237;a de las especies. Localizado  entre los amino&#225;cidos 40 y 92, contiene a su vez un segundo dominio de  transactivaci&#243;n.&nbsp; </FONT></LI>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Dominio de uni&#243;n al ADN, entre los amino&#225;cidos 101 y 306. Comprende las  regiones de alta conservaci&#243;n evolutiva (HCD) II, III, IV y V, lo que explica  similaridad de funciones entre especies. Es el sitio de ocurrencia del  90% de las mutaciones halladas en los tumores cancerosos humanos.&nbsp; </FONT></LI>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Dominio de oligomerizaci&#243;n, entre los amino&#225;cidos 307 y 355. Contiene una  regi&#243;n llamada TET, con secuencias amino&#225;cidos se&#241;alizadoras de la localizaci&#243;n  nuclear (NLS) o citos&#243;lica (NES) de la prote&#237;na. Su estructura secundaria  corresponde a una l&#225;mina <FONT COLOR="#1f1a17">b, seguido por una a-h&#233;lice, necesaria para la  dimerizaci&#243;n de p53.&nbsp;</FONT> </FONT></LI>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Dominio carboxi-terminal, extendido entre los amino&#225;cidos 356 y 393. Con  tres se&#241;ales NLS y un dominio que reconoce sitios de da&#241;o del ADN, este  dominio tambi&#233;n est&#225; implicado en la actividad de regulaci&#243;n negativa del  dominio de uni&#243;n con el ADN localizado entre los amino&#225;cidos 101 y 306.&nbsp; </FONT></LI>     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La regulaci&#243;n negativa efectuada por p53 en respuesta al da&#241;o del ADN,  consiste en detener el ciclo celular tanto en seres humanos como en otros  mam&#237;feros, para dar paso a los procesos de reparaci&#243;n. De esta manera se  protege al organismo de la proliferaci&#243;n de c&#233;lulas con el ADN da&#241;ado o  bien, se activa el proceso de muerte programada o apoptosis en la c&#233;lula  afectada cuando la reparaci&#243;n no ha sido posible. Se honra as&#237; la designaci&#243;n  de p53 como &#147;guardi&#225;n del genoma&#148; y supresor tumoral (43).&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Bajo condiciones normales, la prote&#237;na p53 est&#225; presente en muy baja cantidad  en las c&#233;lulas, debido a que su alta tasa de recambio le confiere una vida  media de unos pocos minutos, lo que significa que el nivel de degradaci&#243;n  es mayor que el de formaci&#243;n de la prote&#237;na. La degradaci&#243;n depende de  la interacci&#243;n con las enzimas ubiquit&#237;n E3 ligasas hdm-2 (hom&#243;logo humano  de murine double minute 2 o mdm2), pirh2 (prote&#237;na inducida por p53, con  un dominio dedos de zinc llamado RING-H2), COP1 (fotomorfog&#233;nico 1 constitutivo)  y ARF-BP17HectH9 con las que forma complejos estables, lo que bloquea su  acci&#243;n como factor de transcripci&#243;n, pues impide su uni&#243;n con las secuencias  blanco de ADN y adem&#225;s favorece su ubiquitinaci&#243;n y posterior prote&#243;lisis  (44-46).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Mdm2 es una prote&#237;na de 90 kD codificada por un oncog&#233;n cuya sobreexpresi&#243;n  inhibe la activaci&#243;n de genes de la v&#237;a supresora tumoral asociada a p53.  Cuando gracias a la actividad kinasa de ATM, ATR, ChK1, ChK2 o ADN-PK,  la prote&#237;na p53 es fosforilada en las serinas 15 y 20 y en la treonina  18 del extremo N-terminal, cambia su conformaci&#243;n espacial, lo que hace  que pierda afinidad por la prote&#237;na mdm2 y se disocie de ella (47, 48).  La peptidilprolilisomerasa PIN1 tambi&#233;n facilita la disociaci&#243;n de mdm2  cuando p53 es fosforilada en la serinas 33 y 315 y en la treonina 81 (49,  50). Numerosas prote&#237;nas con funci&#243;n inhibidora o activadora pueden actuar  sobre mdm2 para modificar su afinidad por p53 y llevar por tanto a su degradaci&#243;n  o bien, a su estabilizaci&#243;n (51) (<a href="#fig2">Fig. 2</a>).</FONT></P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><a name="fig2"><img border="0" src="/img/fbpe/ic/v49n4/art11fig2.jpg" align="center" width="444" height="309"></a></P>     
<P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"><b>Fig. 2. </b>Reguladores de la interacción p53-mdm2. ARF y las proteínas ribosomales L5, L11 y L23 actúan como inhibidoras de la actividad ubiquitín E3 ligasa de mdm2 (hdm2 en humanos) y por tanto promueven la estabilización de p53. La oncoproteína gankyrina, la proteasa específica asociada al herpes virus (HAUSP) y la proteína asociada a queratina KAP1 por su parte, potencian la ubiquitinación y subsiguiente degradación de p53.</font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> ESTABILIZACI&#211;N Y ACTIVACI&#211;N DE p53&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Diversos agentes f&#237;sicos como la radiaci&#243;n ionizante (rayos <FONT COLOR="#1f1a17">g, X y ultravioleta),  qu&#237;micos como hipoxia, aumento de la concentraci&#243;n de radicales libres,  cambios metab&#243;licos o en el pH, producen da&#241;o en el ADN (52-54) que se  manifiesta como formaci&#243;n de d&#237;meros de timidina, p&#233;rdida o ganancia de  nucle&#243;tidos, cambios en la secuencia de nucle&#243;tidos, entre otros. A estas  alteraciones la c&#233;lula responde generando se&#241;ales de estr&#233;s que conducen  al aumento en la cantidad de la prote&#237;na p53 de manera directamente proporcional  a la extensi&#243;n del da&#241;o, como resultado de su estabilizaci&#243;n y activaci&#243;n  a trav&#233;s de diferentes v&#237;as de se&#241;alizaci&#243;n. As&#237;, cuando la se&#241;al inicial  se origina por causa de una ruptura de la doble cadena del ADN, se activan  prote&#237;nas sensoras de da&#241;o entre las que se encuentran ATM, ATR o ADN-PK  (Fig. 3).</FONT></FONT></P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><a name="fig3"><img border="0" src="/img/fbpe/ic/v49n4/art11fig3.jpg" align="center" width="416" height="325"></a></P>     
<p ALIGN="center"><font face="Verdana" size="2"><font COLOR="#231f20"><b>Fig. 3. </b>Estabilización de p53 a través de las vías de señalización ATM, ATR y ADN-PK, activadas como</font> <font COLOR="#231f20">consecuencia del daño al ADN.</font></font></p> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> ATM-ChK2-p53&nbsp; </FONT></B> </P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Esta v&#237;a se activa en respuesta no s&#243;lo al da&#241;o del ADN, sino tambi&#233;n en  presencia de errores durante la replicaci&#243;n del ADN en el ciclo celular  (55). El producto de ATM (gen mutado en la ataxia-telangiectasia) miembro  de la familia de las PI3 kinasas (PI3K), act&#250;a fosforilando directamente  a la prote&#237;na p53 en la serina 15 y de manera indirecta, en las serinas  15 y 37, mediante la fosforilaci&#243;n de la prote&#237;na kinasa ChK2 (checkpoint  kinase 2) (56-58). La fosforilaci&#243;n cambia la conformaci&#243;n estructural  de p53, lo que disminuye su afinidad por mdm2 y facilita la disociaci&#243;n  del complejo. Mdm2 puede entonces manifestar su potencial de transactivaci&#243;n,  antes inhibido por p53. Si como consecuencia del da&#241;o del ADN, la fosforilaci&#243;n  se efect&#250;a en la serina 20, tambi&#233;n se estabiliza p53. En este caso, p53  pierde su afinidad por mdm2, se inhibe la formaci&#243;n del complejo y por  consiguiente disminuye su tasa de degradaci&#243;n (47, 48).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La v&#237;a ATM-ChK2-p53 puede tambi&#233;n ser activada en respuesta a estr&#233;s genot&#243;xico  asociado con la deficiencia de BRCA-1, gen de susceptibilidad al c&#225;ncer  de mama que participa en procesos de reparaci&#243;n del ADN. Los resultados  obtenidos por Cao y col. en 2006 (59) demuestran que en ausencia de BRCA-1,  hay una importante formaci&#243;n de focos <FONT COLOR="#1f1a17">gH2AX (variante de la histona H2A)  que constituyen evidencia de la acumulaci&#243;n de ADN da&#241;ado y no reparado.  Los focos </FONT></FONT> <FONT COLOR="#1f1a17" face="Symbol" size="2">g</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">H2AX ser&#237;an entonces los responsables de la activaci&#243;n de la  se&#241;alizaci&#243;n ATM-ChK2-p53. Mientras en la vida embrionaria dicha v&#237;a constituye  un mecanismo de selecci&#243;n natural que elimina las mutaciones presentes,  en la vida adulta previene la transformaci&#243;n tumoral. No obstante, su hiperactivaci&#243;n  causa envejecimiento prematuro, y compromete por tanto la supervivencia  del individuo (59).</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> ATR-ChK1-p53&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Cuando el ADN sufre un da&#241;o, la prote&#237;na ATR (gen mutado en la ataxia-telangiectasia,  relacionado con Rad 3) lo reconoce e interact&#250;a con &#233;l. Como resultado,  su actividad de kinasa aumenta, lo que en conjunto con ATM favorece la  formaci&#243;n de un complejo de mayor peso molecular con prote&#237;nas presentes  en el n&#250;cleo, como BRCA-1, H2AX y MDC1 (prote&#237;na 1 mediadora del punto  de control de da&#241;o del ADN), entre otras (60).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> ADN-PK-p53</FONT></B></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Al igual que ATM y ATR, ADN-PK es una kinasa nuclear de serina-treonina,  constituida por dos subunidades, una catal&#237;tica y otra de uni&#243;n con el  ADN, llamada tambi&#233;n Ku70/80. Participa en la reparaci&#243;n de la ruptura  de la doble cadena del ADN, mediante la uni&#243;n de los extremos hom&#243;logos  (HR) o no hom&#243;logos (NHEJ) (60). p53 establece una estrecha relaci&#243;n con  la ADN-PK, bien sea formando un complejo sensor para detectar la interrupci&#243;n  de la replicaci&#243;n del ADN cuando se han incorporado an&#225;logos de nucle&#243;sidos  (61) o bien, actuando como regulador corriente arriba en la v&#237;a de apoptosis  mediada por p53, en cuyo caso es fosforilado en la serina 15 (62).</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"><B><FONT COLOR="#1f1a17">ARF</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> p14<FONT COLOR="#1f1a17"><SUP>ARF </SUP>(p19<SUP>ARF</SUP> en rat&#243;n) es un gen al que se le atribuyen diversas funciones  tales como biog&#233;nesis ribosomal, regulaci&#243;n de la transcripci&#243;n, respuesta  al da&#241;o del ADN, apoptosis, autofagia, supresi&#243;n tumoral e inducci&#243;n de  senescencia (63, 64). En los seres humanos, la prote&#237;na ARF es el producto  de un transcrito alternativo del gen <I>Ink4a, </I>donde p14<SUP>ARF</SUP> comparte dos exones  con el transcrito p16<SUP>Ink4a</SUP>, tambi&#233;n supresor tumoral (58). La expresi&#243;n  de p14<SUP>ARF</SUP> est&#225; regulada por factores de transcripci&#243;n, como los miembros  de la familia E2F (65).</FONT></FONT></P> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> ARF-mdm2-p53. </FONT> </B><FONT COLOR="#1f1a17"> Bajo situaciones de estr&#233;s o senescencia, ARF estabiliza  y aumenta la actividad transcripcional de p53, mediante el &#147;secuestro&#148;  de mdm2. Este regulador negativo es una de las ubiquitin E3 ligasas que  marca a la prote&#237;na para su posterior degradaci&#243;n en el proteasoma (63,  66) (<a href="#fig4">Fig. 4</a>).</FONT></font></P>     ]]></body>
<body><![CDATA[<P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><a name="fig4"><img border="0" src="/img/fbpe/ic/v49n4/art11fig4.jpg" align="center" width="453" height="275"></a></P>     
<p ALIGN="center"><font face="Verdana" size="2"><font COLOR="#231f20"><b>Fig. 4.</b> Estabilización y activación de p53 a través e la vía ARF-mdm2 (hdm2 en humanos), en situaciones</font> <font COLOR="#231f20">de estrés o senescencia.</font></font></p>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Aunque hasta el momento se consideraba que la funci&#243;n supresora tumoral  ejercida por ARF depend&#237;a de p53, existe evidencia de que la protecci&#243;n  brindada por dicho gen contra el desarrollo tumoral es absolutamente dependiente  de ARF (67). En tal sentido Christophorou y col. en 2006 (37), demostraron  en un modelo de rat&#243;n en el que el estado de p53 pod&#237;a intercambiarse <I>in  vivo</I> entre funcional e inactivo, que la respuesta patol&#243;gica mediada por  p53 a un carcin&#243;geno genot&#243;xico como la radiaci&#243;n, era incapaz de evitar  la aparici&#243;n de linfomas inducidos por la misma radiaci&#243;n. Por el contrario,  se concluy&#243; que era la activaci&#243;n de p14<FONT COLOR="#1f1a17"><SUP>ARF</SUP> en las c&#233;lulas prelinfoma,  que ocurr&#237;a en respuesta a mutaciones oncog&#233;nicas inducidas por la radiaci&#243;n,  la que en realidad confer&#237;a protecci&#243;n contra el desarrollo tumoral (37).&nbsp;</FONT> </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> A trav&#233;s de ARF, p53 puede actuar para detener el ciclo celular o para  conducir a la c&#233;lula a un estado senescente. Sin embargo, ni la regulaci&#243;n  transcripcional del locus <I>Ink4a </I>ni las v&#237;as de se&#241;alizaci&#243;n asociadas est&#225;n  comprendidas a cabalidad. Entre otras cosas, porque no es claro qu&#233; es  lo que determina que la c&#233;lula, en respuesta al da&#241;o del ADN, escoja entre  la senescencia o la muerte, ni tampoco cu&#225;l es la participaci&#243;n de ARF  en dicha escogencia. Sobre este punto, se ha sugerido que la decisi&#243;n acerca  del destino de la c&#233;lula depende de factores tales como el tipo de modificaci&#243;n  postraduccional experimentado por p53 en respuesta a diferentes est&#237;mulos  que modulan la afinidad por las diversas prote&#237;nas con las que interact&#250;a,  as&#237; como el grupo de genes sobre los que ejerce regulaci&#243;n transcripcional.  Parece existir una preferencia de las c&#233;lulas normales hacia la senescencia,  en comparaci&#243;n con lo que ocurre en las c&#233;lulas transformadas, decisi&#243;n  posiblemente relacionada con la extensi&#243;n del da&#241;o del ADN (66, 68, 69).</FONT></P> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> ARF-ATR-p53. </FONT></B> <FONT COLOR="#1f1a17">  Adem&#225;s de actuar sobre mdm2, ARF tambi&#233;n puede activar la  v&#237;a ATR/ChK1, evento que parece constituir un requisito fundamental para  la efectividad de su funci&#243;n como supresor tumoral (<a href="#fig5">Fig. 5</a>). Con posterioridad  al da&#241;o del ADN, ARF &#147;compromete&#148; a ATR a trav&#233;s de dos mecanismos diferentes:  en el nucleoplasma, ATR activa a ChK1 y &#233;sta a su vez fosforila a NF-k</FONT></font><FONT COLOR="#1f1a17" size="2" face="Symbol">b</FONT><font face="Verdana" size="2" COLOR="#1f1a17">  en la treonina 505 de la subunidad RelA. Esta fosforilaci&#243;n bloquea el  poder transactivador ejercido por RelA sobre Bcl-xl antiapopt&#243;tico, para  reprimir su expresi&#243;n y por consiguiente sensibilizar la c&#233;lula a la apoptosis.  En consistencia con estos hallazgos, NF-kb ha sido relacionado con la estabilizaci&#243;n  de p53(70). Por otra parte, ARF puede actuar sobre ATR, tanto en el nucleoplasma  como en el nucleolo (71, 72), para inducir la formaci&#243;n de un complejo  entre ATR y BRCA1. Mediante fosforilaci&#243;n en la serina 15, dicho complejo  contribuye a la activaci&#243;n y estabilizaci&#243;n de p53 (73). Esto explica que  las mutaciones en genes supresores tumorales como BRCA1 est&#233;n implicadas  en la carcinog&#233;nesis del epitelio superficial del ovario, evento en el  que BRCA1 se caracteriza por inhibir la proliferaci&#243;n inducida por estr&#243;genos  (74).</font></P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><a name="fig5"><img border="0" src="/img/fbpe/ic/v49n4/art11fig5.jpg" align="center" width="502" height="290"></a></P>     
<p ALIGN="center"><font face="Verdana" size="2"><font COLOR="#231f20"><b>Fig. 5.</b> Estabilización y activación de p53 a través de la vía ATR/ChK1 mediada por ARF, bajo condiciones</font> <font COLOR="#231f20">de daño del ADN.</font></font></p>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> DETENCI&#211;N DEL CICLO CELULAR&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Con la estabilizaci&#243;n de p53, su vida media aumenta, lo que se refleja  en una mayor concentraci&#243;n celular de la prote&#237;na, suficiente para activar  la transcripci&#243;n de genes que participan en los puntos de control G<FONT COLOR="#1f1a17"><SUB>1</SUB>/S  o G<SUB>2</SUB>/M del ciclo celular, como p21<SUP>WAF-1</SUP>, GADD45a, 14-3-3s y B99 entre otros  (51, 75). Al respecto es interesante anotar que la desregulaci&#243;n del punto  de control G<SUB>2</SUB> es una de las caracter&#237;sticas de la transformaci&#243;n maligna,  pues constituye la &#250;ltima barrera antes de que las c&#233;lulas con el ADN mutado  puedan adquirir inmortalidad.</FONT></FONT></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"><B><FONT COLOR="#1f1a17">p21</FONT></B><FONT COLOR="#1f1a17"><SUP><B>WAF-1</B></SUP></FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana">Cuando p53 induce la expresi&#243;n de p21<FONT COLOR="#1f1a17"><SUP>WAF-1</SUP>, cuyo producto es una enzima  inhibidora universal de las kinasas dependientes de ciclinas (CDKs) (76),  se detiene el ciclo en el punto de control G<SUB>1</SUB>. Esto se debe a que la enzima  se asocia con ciclinas y con CDKs, as&#237; como con el ant&#237;geno nuclear de  proliferaci&#243;n celular (PCNA) para formar complejos cuaternarios que impiden  la progresi&#243;n del ciclo y detienen la propagaci&#243;n de mutaciones oncog&#233;nicas (<a href="#fig6">Fig. 6</a>). La actividad kinasa est&#225; inhibida cuando dos mol&#233;culas de la  prote&#237;na p21<SUP>WAF-1</SUP> se acoplan con los complejos ciclina D-CDK4/6, ciclina  E-CDK2 y ciclina A-CDK2, necesarios para que la c&#233;lula avance desde la  fase G<SUB>1</SUB> hasta la S del ciclo, o con los complejos ciclina A-CDK2 y ciclina  B-CDK2, que permiten pasar de S/G<SUB>2</SUB> y G<SUB>2</SUB>/M respectivamente (77, 78). Cuando  las CDKs est&#225;n inhibidas, la c&#233;lula no puede avanzar a lo largo del ciclo,  pero a cambio dispone del tiempo necesario para reparar el ADN da&#241;ado.  Se ha demostrado que niveles aumentados de p21<SUP>WAF-1</SUP> y de p53 fosforilado  est&#225;n relacionados con el ingreso de la c&#233;lula a un estado senescente (79).<I>  </I>Por otra parte, se comprende mejor la importancia de p21<SUP>WAF-1</SUP> cuando se  tiene en cuenta que su deficiencia o su inhibici&#243;n permite a las c&#233;lulas  escapar de la senescencia y extender por tanto su existencia, hasta un  estado en el que aparece una segunda barrera proliferativa y se detiene  la divisi&#243;n celular. En esta etapa, llamada tambi&#233;n crisis, las c&#233;lulas  mueren en forma masiva, debido a la inestabilidad cromos&#243;mica generada  (80).</FONT></FONT></P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><a name="fig6"><img border="0" src="/img/fbpe/ic/v49n4/art11fig6.jpg" align="center" width="443" height="347"></a></P>     
<P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" face="Verdana" size="2"><b>Fig. 6. </b>Papel inhibidor de p21WAF-1 sobre los complejos ciclina-CDK en los puntos de control del ciclo celular. Cuando p21WAF-1 se une al antígeno de proliferación celular (PCNA) también detiene el ciclo en G1 para permitir la reparación del ADN.</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> GADD45</FONT><FONT COLOR="#1f1a17" size="2" face="Symbol">a</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">&nbsp;</FONT></B></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El producto de este gen, llamado &#147;gen 45<FONT COLOR="#1f1a17" FACE="Symbol" SIZE="3">a de detenci&#243;n del crecimiento  e inducible por da&#241;o del ADN&#148; act&#250;a en los puntos de control G<SUB>1</SUB> y G<SUB>2</SUB>. En  G<SUB>1</SUB> detiene el ciclo mediante su interacci&#243;n con PCNA, mientras que en G<SUB>2</SUB>  inhibe al complejo ciclina B1-cdc2, tambi&#233;n llamado factor promotor de  la mitosis </FONT><FONT COLOR="#000000" FACE="Caslon224 Bk BT" SIZE="3">MPF<I>, </I>lo</FONT><FONT COLOR="#1f1a17"> que impide la transici&#243;n a la fase M. GADD45a contribuye  adem&#225;s a la estabilidad gen&#243;mica, en raz&#243;n de que participa en el mecanismo  de reparaci&#243;n por excisi&#243;n del ADN. En adici&#243;n, GADD45a toma parte en los  procesos de apoptosis, supervivencia celular e inmunidad innata (81, 82).</FONT></FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> 14-3-3</FONT><FONT COLOR="#1f1a17" size="2" face="Symbol">s</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">&nbsp;</FONT></B></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> En la fase G2 del ciclo celular act&#250;a tambi&#233;n el producto proteico del  gen 14-3-3</font><font size="2" face="Symbol">s</font><font face="Verdana" size="2">, cuando es inducido por p53 en respuesta al da&#241;o del ADN. Una  vez la prote&#237;na expresada interact&#250;a con kinasas dependientes de ciclinas (CDK</font><font size="2" face="Symbol">s</font><font face="Verdana" size="2">), puede regular el ciclo en forma negativa, pues &#147;secuestra&#148; complejos  Cdc2/CDK1-ciclina B y los transporta desde el n&#250;cleo hasta el citoplasma.  Adem&#225;s, las prote&#237;nas 14-3-3</font><font size="2" face="Symbol">s</font><font face="Verdana" size="2"> ejecutan una retroalimentaci&#243;n positiva sobre  p53, lo que aumenta su estabilidad y su actividad transcripcional. Esto  se debe a la regulaci&#243;n negativa que 14-3-3</font><font size="2" face="Symbol">s</font><font face="Verdana" size="2"> ejerce sobre mdm2, lo que  potencia la actividad de p53. Es explicable entonces su papel en el control  de la transformaci&#243;n tumoral, sobre el que existen reportes que muestran  una disminuci&#243;n en la expresi&#243;n de 14-3-3</font><font size="2" face="Symbol">s</font><font face="Verdana" size="2"> en varios tipos de c&#225;ncer (83.  84), como el carcinoma del epitelio superficial del ovario (85). La disminuci&#243;n  obedece m&#225;s a silenciamiento epigen&#233;tico por metilaci&#243;n en islas CpG que  a alteraciones gen&#233;ticas (86) y est&#225; asociada con un aumento en los niveles  de mdm2 y con la inhibici&#243;n de la actividad de p53 (51).&nbsp;</font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> INDUCCI&#211;N DE APOPTOSIS&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El impacto de p53 en el suicidio celular queda en evidencia cuando se considera  que hasta la fecha, el n&#250;mero descrito de genes mediadores de apoptosis  sobre los que act&#250;a es mayor que el de los que participan en el ciclo celular  bajo su influencia reguladora. Sin embargo, en su car&#225;cter de inductor  de la apoptosis, p53 no s&#243;lo participa como factor de transcripci&#243;n, sino  tambi&#233;n a trav&#233;s de mecanismos independientes de la transcripci&#243;n que involucran  a la v&#237;a intr&#237;nseca mitocondrial. En ambos casos, se produce permeabilizaci&#243;n  de la membrana externa de la mitocondria a trav&#233;s de la activaci&#243;n de prote&#237;nas  proapopt&#243;ticas de la familia Bcl-2, como BAX y BAK (87).&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> MECANISMOS TRANSCRIPCIONALES&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> Genes blanco&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Como factor de transcripci&#243;n, p53 act&#250;a sobre el promotor de genes como  PUMA, NOXA, bcl-2, BAX, Apaf-1, p53A1P1, IGF-BP3, DR5/KILLER, Fas/Apo-1,  PIG, PAG608, PERP, PIDD, DRAL y Scotin (88), aunque se cree que tal acci&#243;n  no es absolutamente indispensable para promover la muerte celular programada  (44).</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> NOXA y PUMA</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Los miembros NOXA y PUMA de la subfamilia de genes Bcl-2 s&#243;lo BH-3, codifican  las prote&#237;nas proapopt&#243;ticas del mismo nombre. Cuando estas son translocadas  a la mitocondria, se unen a las prote&#237;nas de supervivencia Bcl-2 y Bcl-xl  respectivamente, tambi&#233;n miembros del grupo Bcl-2. Este hecho no s&#243;lo causa  la inhibici&#243;n de Bcl-2 y Bcl-xl, sino que adem&#225;s hace que BAX y BAK puedan  ejercer su efecto proapopt&#243;tico (38) (<a href="#fig7">Fig. 7</a>). BAX y BAK a su vez, se unen  en 2-10 focos a lo largo de la membrana mitocondrial externa, los cuales  funcionan como poros que permiten la liberaci&#243;n de prote&#237;nas al citosol  (89). Los eventos antes enunciados desencadenan por una parte, la ca&#237;da  del potencial transmembranal y por otra, la liberaci&#243;n del citocromo c  (38), efectos que han sido tambi&#233;n relacionados con la activaci&#243;n funcional  de BAX y p53A1P1 (90). Es interesante que los focos BAX/BAK est&#233;n localizados  conjuntamente con sitios de fisi&#243;n mitocondrial, as&#237; como con Drp1 y Mfn2,  GTPasas relacionadas con la fragmentaci&#243;n de la mitocondria. La escisi&#243;n  mitocondrial ocurre antes de la activaci&#243;n de las caspasas, en estrecha  asociaci&#243;n con la translocaci&#243;n de BAX y la liberaci&#243;n de citocromo c (89,  91).</FONT></P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><a name="fig7"><img border="0" src="/img/fbpe/ic/v49n4/art11fig7.jpg" align="center" width="416" height="324"></a></P>     
<P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"><b>Fig. 7.</b> Participación de p53 en la vía intrínseca de la apoptosis. Como transactivador, p53 induce la expresión de PUMA, NOXA, BAX y Bid entre otros. Como transrepresor, altera la expresión de Bcl-xl y Bcl-2, con el que también puede también formar complejos.</font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Bcl-2 y BAX</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> p53 puede adem&#225;s regular en forma directa la transcripci&#243;n de bcl-2 antiapopt&#243;tico,  mediante la uni&#243;n con un elemento silenciador localizado en la regi&#243;n promotora  del gen bcl-2 (92, 93). Con relaci&#243;n a BAX, cuando p53 interact&#250;a con el  gen, la prote&#237;na generada promueve la liberaci&#243;n del citocromo c, desde  el espacio intermembranoso de la mitocondria hacia el citosol, lo que constituye  el paso previo a la activaci&#243;n de la cascada proapopt&#243;tica de las caspasas.  No obstante, cuando p53 est&#225; sobreexpresado, la apoptosis ocurre sin el  concurso de BAX (94).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Cuando la extensi&#243;n del da&#241;o del ADN no alcanza una magnitud apreciable,  y se est&#225; en presencia de Bcl-2, es factible la reparaci&#243;n antes de que  p53 pueda dar inicio al programa de suicidio celular. Por tanto, Bcl-2  no s&#243;lo inhibe el transporte subcelular de p53 sino tambi&#233;n a las mol&#233;culas  adaptadoras corriente abajo que se necesitan para activar la v&#237;a apopt&#243;tica  de las caspasas. Es explicable entonces que una elevada expresi&#243;n de bcl-2  haya sido relacionada tanto con el tejido epitelial normal como con patolog&#237;as  benignas y con tumores de tipo <I>&#147;borderline&#148;</I> ov&#225;ricos (95), con base en  el supuesto de la asociaci&#243;n del gen con una conducta maligna menos agresiva  en algunos tipos de c&#225;ncer. Esto permite pensar en la expresi&#243;n de bcl-2  como potencial predictor del control de la apoptosis.&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En un estudio efectuado por De La Torre y col. (96) en 2007, se report&#243;  una baja expresi&#243;n de bcl-2 en la mayor&#237;a de carcinomas ov&#225;ricos epiteliales  analizados, en contraste con los elevados niveles de expresi&#243;n de p53,  y con un alto &#237;ndice apopt&#243;tico (definido como n&#250;mero total de eventos  apopt&#243;ticos en un &#225;rea determinada de observaci&#243;n al microscopio). Sus  resultados indicaron que tanto la acumulaci&#243;n nuclear de p53 como el &#237;ndice  apopt&#243;tico pod&#237;an ser considerados como predictores independientes de recurrencia  de la enfermedad y de menor sobrevida. Resultados similares ya hab&#237;an sido  obtenidos para otros tipos de tumores (97), donde se demostr&#243; no s&#243;lo el  papel relevante de la apoptosis en la eliminaci&#243;n de las c&#233;lulas malignas,  sino tambi&#233;n la inducci&#243;n de muerte celular programada mediante la aplicaci&#243;n  de quimioterapia sobre c&#233;lulas cancerosas ov&#225;ricas (98). En su estudio,  De La Torre y col. determinaron un mayor &#237;ndice apopt&#243;tico para los tumores  de mayor agresividad, como son los de alto grado y los de tipo seroso,  donde no por azar se expres&#243; la proteina p53 con mayor intensidad (96).</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> Scotin&nbsp;</FONT></B></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Otro blanco transcripcional de p53 es scotin, gen que produce una prote&#237;na  localizada en la membrana del n&#250;cleo y del ret&#237;culo endopl&#225;smico. En forma  dependiente del ret&#237;culo endopl&#225;smico, se ha demostrado que act&#250;a como  mediadora de la apoptosis inducida por p53 (44, 99).</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"><B><FONT COLOR="#1f1a17">Liberaci&#243;n del citocromo c y formaci&#243;n del apoptosoma</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Por otra parte y como resultado de la liberaci&#243;n del citocromo c, mediada  a su vez por la activaci&#243;n de BAX, NOXA, PUMA o p53AIPI, se forma el apoptosoma.  En presencia del citocromo c, Apaf-1 sufre un cambio conformacional que  permite el reclutamiento de la caspasa 9 (100). Esta puede activar entonces  directamente a las caspasas 3 y 7 para dar inicio, en una forma ordenada,  al clivaje de sustratos intracelulares y a la generaci&#243;n de un fenotipo  apopt&#243;tico (101, 103). En una etapa temprana de la apoptosis, uno de los  sustratos clivados bajo la acci&#243;n de la caspasa 3 es la polimerasa poli  (ADP-ribosa) (PARP-1), enzima que en condiciones de supervivencia participa  en la reparaci&#243;n del ADN da&#241;ado. Ello explica que, en presencia de alteraciones  de p53, PARP-1 se acumule en el n&#250;cleo neopl&#225;sico de las c&#233;lulas del carcinoma  ov&#225;rico seroso (104).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Transcripci&#243;n y trimerizaci&#243;n de Fas y DR5-Killer</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En la v&#237;a extr&#237;nseca de inducci&#243;n de la apoptosis, p53 activa tanto la  transcripci&#243;n como el agrupamiento del receptor Fas y DR5-KILLER, receptores  de muerte localizados en la membrana plasm&#225;tica (105) (<a href="#fig8">Fig. 8</a>). El ant&#237;geno  Fas (Apo-1/CD95) acoplado a su receptor Fas-L-miembro de la familia de  los receptores TNF (factor de necrosis tumoral) de la superficie celular-  forman un complejo que act&#250;a como potente inductor de la apoptosis. El  ant&#237;geno Fas se expresa en el epitelio superficial del ovario, donde se  ha demostrado la muerte apopt&#243;tica subsiguiente a su uni&#243;n con FasL (106).  Por su parte, FasL es una prote&#237;na transmembranal de los linfocitos T citot&#243;xicos  que se caracteriza porque interact&#250;a con Fas, bien sea unido a la membrana  o bien, en una forma clivada soluble. La ocupaci&#243;n de los receptores Fas  y DR5-KILLER por sus respectivos ligandos resulta en su agrupamiento y  trimerizaci&#243;n (44). A continuaci&#243;n, el reclutamiento de las caspasas iniciadoras  2, 8 &#243; 10 provoca el clivaje y consiguiente activaci&#243;n de las procaspasas  efectoras 3, 6 &#243; 9 o bien, la amplificaci&#243;n de la cascada proapopt&#243;tica  (101).</FONT></P>     <P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><a name="fig8"><img border="0" src="/img/fbpe/ic/v49n4/art11fig8.jpg" align="center" width="552" height="425"></a></P>     
<P align="center" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"><b>Fig. 8. </b>p53 participa tanto en la vía extrínseca como en la vía intrínseca de inducción de la apoptosis: activa la transcripción y la trimerización de los receptores Fas/DR5, mientras que en la mitocondria permite la liberación de citocromo c.</font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> MECANISMOS NO TRANSCRIPCIONALES&nbsp; </FONT></B> </P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Mediante mecanismos independientes de la activaci&#243;n transcripcional, p53  puede ser translocado a la membrana mitocondrial (<a href="#fig8">Fig. 8</a>), donde interact&#250;a  con la prote&#237;na BAK, lo que implica la ruptura del complejo formado por  BAK y una prote&#237;na antiapopt&#243;tica del grupo Bcl-2, llamada Mcl1 (107).  BAK, libre de la inhibici&#243;n impuesta por Mcl1, puede entonces ejercer su  efecto inductor de la muerte programada.&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En la membrana mitocondrial, la prote&#237;na p53 provoca adem&#225;s la liberaci&#243;n  r&#225;pida de citocromo c y se une por medio de su dominio central con regiones  espec&#237;ficas de las prote&#237;nas Bcl-2 y Bcl-xl antiapopt&#243;ticas. Esto explica  por qu&#233; las mutaciones del gen en esa regi&#243;n alteran la uni&#243;n con Bcl-xl,  aunque la translocaci&#243;n a la mitocondria permanece intacta (108). Se ha  demostrado que la localizaci&#243;n mitocondrial de p53 depende de la abundancia  de la forma pleiotr&#243;pica p53Arg72, que act&#250;a como fuerte inductora de la  apoptosis (44). Dicha forma se relaciona con el polimorfismo del cod&#243;n  72 de la prote&#237;na, que consiste en la presencia de una citocina o una guanina  en el nucle&#243;tido 347 del gen, para generar tripletas CCC o CGC. La secuencia  CCC se traduce en el amino&#225;cido prolina y CGC en arginina. Estas variaciones  pueden afectar la funci&#243;n de la prote&#237;na. El caso de p53 es interesante,  debido a la gran cantidad de prote&#237;nas con las que interact&#250;a y los m&#250;ltiples  procesos celulares en los que interviene. Se sabe que la presencia de arginina  hace que p53 tenga no solo mayor afinidad por mdm2, sino una mayor eficiencia  para inducir la apoptosis. Adem&#225;s, los tumores son m&#225;s oncog&#233;nicos con  relaci&#243;n a lo que ocurre cuando la prolina est&#225; presente. Estudios de asociaci&#243;n  de este polimorfismo con el desarrollo de c&#225;ncer ov&#225;rico epitelial han  mostrado una tendencia hacia el aumento en su incidencia en mujeres portadoras  del alelo Arg, en poblaciones cauc&#225;sicas y surafricanas negras, para las  cuales se ha observado aparici&#243;n de la enfermedad a una menor edad en comparaci&#243;n  con las portadoras del alelo Pro (109-111). Los resultados de estos estudios  coinciden con los hallazgos reportados para otros tipos de c&#225;ncer. As&#237;  por ejemplo se demostr&#243; que la forma Arg/Arg aument&#243; en casi dos veces  m&#225;s el riesgo de desarrollar c&#225;ncer de mama en una poblaci&#243;n colombiana  (112).</FONT></P> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Dentro del grupo de genes inducidos por p53 se han identificado algunos  cuyos productos generan o responden al estr&#233;s oxidativo. Tal es el caso  de los genes que codifican enzimas reguladoras del estado redox de la c&#233;lula,  como los PIGs y la ferrodoxin-reductasa. Los primeros expresan especies  reactivas de ox&#237;geno (ROS), que alteran la integridad de la mitocondria  y dan inicio al programa de muerte, mientras que los segundos sensibilizan  a las c&#233;lulas a la apoptosis inducida por ROS (44). Aunque el estr&#233;s oxidativo  es el preludio cl&#225;sico de la activaci&#243;n de p53, &#233;ste puede regular la producci&#243;n  de ROS. A su vez, la actividad del gen es controlada por los cambios en  el estado redox de la c&#233;lula (113). POX, gen inducido por p53, codifica  la enzima mitocondrial que oxida a la prolina (prolinoxidasa) y genera  especies reactivas de ox&#237;geno. En el carcinoma ov&#225;rico, p53 induce a la  prolina oxidasa, lo que sumado a la generaci&#243;n de ROS, favorece la activaci&#243;n  de la calcineurina. La calcineurina a su vez, se encuentra asociada con  la calmodulina en un complejo con importantes funciones reguladoras sobre  el proceso apopt&#243;tico. Cuando ocurre la activaci&#243;n de POX por p53, no s&#243;lo  aumenta la producci&#243;n de ROS sino tambi&#233;n se produce un flujo de calcio  hacia el citosol, tanto desde el medio extracelular, como a partir de las  reservas intracelulares. La movilizaci&#243;n de calcio activa al complejo calmodulina/calcineurina  y permite que la calcineurina act&#250;e mediante defosforilaci&#243;n para modular  la actividad de diferentes fosfoprote&#237;nas involucradas en el proceso de  muerte por apoptosis, como Bcl-2 y Bad (113).&nbsp;</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> ETIOLOG&#205;A Y PATOG&#201;NESIS DEL C&#193;NCER OV&#193;RICO EPITELIAL&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Etiolog&#237;a</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Se han postulado dos hip&#243;tesis con el fin de explicar la transformaci&#243;n  maligna de las c&#233;lulas epiteliales ov&#225;ricas: la primera, llamada <I>&#147;teor&#237;a  de la ovulaci&#243;n incesante</I>&#148; (114), considera que la repetida degradaci&#243;n  y reparaci&#243;n del epitelio durante cada ovulaci&#243;n (aproximadamente 400 veces  en la vida de la mujer) son factores que favorecen la mutag&#233;nesis y la  malignidad de ESO. Es entonces factible considerar a la ovulaci&#243;n como  un evento inflamatorio agudo, provocado por la prote&#243;lisis de la superficie  ov&#225;rica, seguida por un proceso de reparaci&#243;n tisular susceptible de sufrir  desregulaci&#243;n (115). En el momento de la ovulaci&#243;n, el fol&#237;culo dominante  establece contacto con la superficie gonadal para formar el estigma, es  decir el sitio donde la ruptura del epitelio permite la expulsi&#243;n del oocito  secundario. El propio epitelio ejerce un efecto inductor sobre la ruptura,  pues participa en la prote&#243;lisis de la l&#225;mina basal y de la t&#250;nica albug&#237;nea  que lo sustentan (11). Por su parte, los leucocitos que han infiltrado  al fol&#237;culo generan la gran mayor&#237;a de radicales libres liberados durante  la ovulaci&#243;n (116), los que conjuntamente con el flujo isquemia-reperfusi&#243;n,  acompa&#241;an a la remodelaci&#243;n tisular periovulatoria (117). Las c&#233;lulas epiteliales  m&#225;s pr&#243;ximas, en raz&#243;n de su elevado grado de exposici&#243;n a la acci&#243;n de  los mediadores inflamatorios y de las especies reactivas de ox&#237;geno, sufren  apoptosis. Cuanto m&#225;s alejadas se encuentren las c&#233;lulas epiteliales del  radio de acci&#243;n de las sustancias oxidantes, la probabilidad de que mueran  es menor, lo que no significa que puedan escapar de la influencia de concentraciones  subletales de dichas sustancias (118). Como resultado de esta influencia,  el epitelio puede ser vulnerable al da&#241;o del ADN no reparado, situaci&#243;n  explicable si se tiene en cuenta que no ha estado sometido a una elevada  presi&#243;n evolutiva, lo que le permitir&#237;a responder en forma exitosa a ovulaciones  repetidas. Las c&#233;lulas que no sufrieron apoptosis pero estuvieron expuestas  a sustancias oxidantes son las que, con posterioridad a la ovulaci&#243;n, deben  proliferar y restaurar el epitelio ov&#225;rico, en por lo menos 2/3 partes.  Se ha demostrado que la reparaci&#243;n del 1/3 restante est&#225; relacionada con  el crecimiento folicular previo a la ovulaci&#243;n. En caso de que haya ocurrido  da&#241;o oxidativo del ADN, p53 puede detener el ciclo ovulatorio durante su  fase l&#250;tea o bien, seg&#250;n la extensi&#243;n del da&#241;o, reparar la lesi&#243;n mediante  el mecanismo de excisi&#243;n de bases mediado por la ADN polimerasa <FONT COLOR="#1f1a17">b (119).  En presencia de mutaciones de supresores tumorales como p53, o de defectos  en las v&#237;as de reparaci&#243;n del ADN, se podr&#237;a suponer que las c&#233;lulas epiteliales  con da&#241;o oxidativo del ADN no reparado que participan en el proceso de  regeneraci&#243;n son las responsables de la carcinog&#233;nesis del epitelio superficial  del ovario (120).</FONT></FONT></P> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La segunda hip&#243;tesis, llamada <I>&#147;estimulaci&#243;n hormonal&#148;,</I> propone a las gonadotropinas  como el principal factor que favorece la transformaci&#243;n maligna de ESO,  con base en la demostraci&#243;n de la presencia de receptores espec&#237;ficos en  las c&#233;lulas epiteliales (121, 122). <I>In vivo,</I> la estimulaci&#243;n hormonal produce  proliferaci&#243;n de dichas c&#233;lulas, mientras que <I>in vitro</I> los reportes son  variables: algunos muestran que aumentan la actividad mitog&#233;nica (123-125)<FONT COLOR="#1f1a17"><SUP>  </SUP>y otros que no la afectan en absoluto (126). Tal diferencia podr&#237;a explicarse  si se tiene en cuenta la posible regulaci&#243;n ejercida por factores promotores  de crecimiento liberados localmente. As&#237;, se ha establecido que el tratamiento  con gonadotropinas (FSH, LH, hCG) induce apoptosis en ESO normal, debido  a que reduce la cantidad de N-cadherina y activa la se&#241;alizaci&#243;n b-catenina/TCF.  Esto sugiere que dicha v&#237;a, una vez estimulada por las gonadotropinas,  puede regular el comportamiento proliferativo de las c&#233;lulas normales de  ESO (126).&nbsp;</FONT> </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La FSH ejerce un efecto dual, tanto en favor como en contra de la apoptosis  de las c&#233;lulas de ESO. As&#237;, en respuesta a los picos preovulatorios de  FSH y LH, las adhesiones intercelulares mediadas por N-cadherina sufren  ruptura, mientras que las c&#233;lulas epiteliales circundantes mueren por apoptosis.  Sin embargo, en otras fases del ciclo como la postovulatoria, con niveles  menores de FSH, ocurre proliferaci&#243;n, con el fin de facilitar la reparaci&#243;n  tisular. Si en las c&#233;lulas epiteliales sobrevivientes se acumularon mutaciones,  la posibilidad de que se forme un tumor es muy alta (125). En este orden  de ideas, es posible inferir que a mayor n&#250;mero de eventos ovulatorios  o con la ca&#237;da perimenop&#225;usica de la FSH, aumenta el riesgo de c&#225;ncer ov&#225;rico  (10). Se debe tener en cuenta adem&#225;s que las gonadotropinas pueden provocar  p&#233;rdida de la membrana basal epitelial (127), de manera semejante a lo  que ocurre durante la ovulaci&#243;n, lo que genera alteraciones, tanto en la  arquitectura tisular, como en las v&#237;as de se&#241;alizaci&#243;n asociadas al contacto  intercelular. De alguna manera, la p&#233;rdida de la membrana basal favorece  los mecanismos de supervivencia celular, lo que conduce a que se seleccionen  c&#233;lulas que son resistentes a la apoptosis. As&#237;, en ausencia o p&#233;rdida  de la membrana basal, la estimulaci&#243;n gonadotr&#243;pica repetitiva incrementa  la probabilidad de que una subpoblaci&#243;n de c&#233;lulas epiteliales con mutaciones  acumuladas, no solo sobreviva sino tambi&#233;n pueda progresar hacia la transformaci&#243;n  tumoral (128).&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Aunque las dos hip&#243;tesis, ovulaci&#243;n incesante y estimulaci&#243;n hormonal,  han sido consideradas en forma independiente, existe evidencia de que no  son mutuamente excluyentes (129).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las gonadotropinas no son las &#250;nicas hormonas con efecto demostrable sobre  las c&#233;lulas epiteliales. Tambi&#233;n los esteroides act&#250;an sobre ellas, de  modo que, cuando los estr&#243;genos se unen a los receptores ER <FONT COLOR="#1f1a17">a o b desencadenan  una se&#241;alizaci&#243;n que ha sido asociada en algunos casos con apoptosis (130)  y en otros con antiapoptosis (131). Debido a la afinidad que existe entre  el complejo estr&#243;genos-ERb y ciertos elementos de reconocimiento de la  regi&#243;n promotora de FasL, aumenta la cantidad de prote&#237;na FasL y se activa  por tanto la v&#237;a extr&#237;nseca de muerte. Tanto los niveles de expresi&#243;n de  FasL como de ERb cambian a lo largo del ciclo ov&#225;rico y esto determina  la aparici&#243;n de variaciones en el patr&#243;n de apoptosis inducida por estr&#243;genos.  En carcinomas metast&#225;sicos ov&#225;ricos se ha reportado reducci&#243;n o supresi&#243;n  de la expresi&#243;n de los receptores ERb, lo que ha llevado a proponerlos  como reguladores claves en la transformaci&#243;n metast&#225;sica y tumoral de ESO (132).</FONT></FONT></P> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las c&#233;lulas epiteliales ov&#225;ricas poseen tambi&#233;n receptores para progesterona  y para andr&#243;genos. La presencia de los primeros explica los efectos antiproliferativo  y antiinflamatorio de los progest&#225;genos, as&#237; como el papel protector que  &#233;stos ejercen en la gestaci&#243;n y la contracepci&#243;n oral contra la transformaci&#243;n  maligna (115, 123, 133), mientras que los segundos -en raz&#243;n de su efecto  antiapopt&#243;tico y a favor de la proliferaci&#243;n- apoyan la asociaci&#243;n entre  los andr&#243;genos y la etiolog&#237;a del c&#225;ncer ov&#225;rico (134).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estudios con cultivos celulares de ESO de ovejas han demostrado que, con  posterioridad a la administraci&#243;n de progesterona, no s&#243;lo disminuyen las  tasas de proliferaci&#243;n celular &#150;tanto la basal como la estimulada por 17</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">b</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">-estradiol&#150;  sino adem&#225;s aumenta la expresi&#243;n de p53 (123). Por otra parte, se ha reportado  en l&#237;neas celulares derivadas de c&#225;ncer ov&#225;rico epitelial, que la progesterona  induce apoptosis y estimula la expresi&#243;n de p53, lo que indica que el esteroide  puede trascender a la transformaci&#243;n maligna para ejercer su acci&#243;n inhibidora  del crecimiento celular (135, 136).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En todo caso, la actividad mitog&#233;nica aumentada de las c&#233;lulas epiteliales,  indispensable para la reparaci&#243;n de la &#147;herida&#148; de la superficie ov&#225;rica,  es la responsable de la formaci&#243;n de quistes de inclusi&#243;n, cuya presencia  ha sido relacionada con metaplasias y neoplasias, debido no s&#243;lo a que  aparecen en mujeres con riesgo hereditario de c&#225;ncer ov&#225;rico, sino tambi&#233;n  a que en sus c&#233;lulas se han hallado los marcadores m&#252;llerianos CA125 y  E-cadherina (33) y formas mutantes de p53, as&#237; como disfunci&#243;n de BRCA1.  A este respecto, existen reportes que asocian a los marcadores de metaplasia  m&#252;lleriana con un status de premalignidad del epitelio superficial del  ovario (137), mientras que la deficiencia de BRCA1 se conoce que se debe  a la metilaci&#243;n de la regi&#243;n promotora (32).</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><B><FONT COLOR="#1f1a17" size="2" face="Verdana">Patog&#233;nesis&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Los circuitos reguladores de la proliferaci&#243;n y la homeostasis celular  est&#225;n alterados en las c&#233;lulas cancerosas. Seg&#250;n Hanahan y Weinberg (34),  el cat&#225;logo de los cambios celulares y bioqu&#237;micos involucrados debe incluir  eventos tales como autosuficiencia en las se&#241;ales promotoras de crecimiento,  disminuci&#243;n o ausencia en la respuesta a se&#241;ales capaces de inhibirlo,  evasi&#243;n de la muerte celular programada, as&#237; como un potencial replicativo  ilimitado y una capacidad sostenida de angiog&#233;nesis y de invasi&#243;n tisular  y met&#225;stasis (34). En forma reciente fueron a&#241;adidas a este listado las  alteraciones metab&#243;licas y lo que podr&#237;a ser traducido al espa&#241;ol como  &#147;troncalidad&#148; (stem cell-ness), o sea la caracter&#237;stica que presentan algunos  tumores que los hace semejantes a c&#233;lulas madre y que se encuentra asociada  con un mal pron&#243;stico (138, 139).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En el c&#225;ncer humano, las mutaciones de p53 juegan un papel central, en  especial las missense o sin sentido. Con una frecuencia de 90%, &#233;stas se  presentan entre los exones 4 y 10 del gen, en el dominio de uni&#243;n al ADN  y son las responsables de generar consecuencias biol&#243;gicas m&#225;s acentuadas  si se las compara con las mutaciones debidas a la introducci&#243;n de codones  de parada en las secuencias codificantes, o con las mutaciones en dominios  diferentes al de uni&#243;n con el ADN (140). En la transformaci&#243;n y progresi&#243;n  del c&#225;ncer del epitelio superficial del ovario, las mutaciones o el silenciamiento  de p53 han sido relacionados en forma espec&#237;fica con la disminuci&#243;n o ausencia  en la respuesta a las se&#241;ales inhibidoras del crecimiento (109), a semejanza  de lo que ocurre con otros genes como BRCA1, BRCA2 (141), p21, p27 (142,  143), PTEN (144), ARHI (145) y caveolina-1 (146) en sus formas mutadas  o silenciadas.</FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Modelo de Kurman y Shih</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Con base en estudios previos de &#237;ndole cl&#237;nica, patol&#243;gica y de gen&#233;tica  molecular, Kurman y Shih (147) propusieron en 2008 un modelo para explicar  la patog&#233;nesis del c&#225;ncer ov&#225;rico, seg&#250;n el cual los tumores de este &#243;rgano  se pueden agrupar en dos tipos. Los tipo I son usualmente estables y de  crecimiento lento. Se forman a partir de lesiones precursoras bien definidas  conocidas como tumores <I>&#147;borderline&#148;</I> y presentan mutaciones en genes como  KRAS, BRAF, PTEN y <FONT COLOR="#1f1a17">b-catenina. Los tipo II por su parte, son los que exhiben  mayor agresividad e inestabilidad gen&#233;tica e incluyen los carcinomas indiferenciados,  los serosos de alto grado y los carcinosarcomas (MMMTs). Los tipo II, en  forma caracter&#237;stica, presentan mutaciones de p53. De aparici&#243;n muy temprana  en la transformaci&#243;n maligna, se cree que dichas mutaciones se han conservado  a lo largo de la &#147;evoluci&#243;n&#148; del c&#225;ncer, lo que explicar&#237;a su presencia  en los tumores ov&#225;ricos, tanto primarios como recurrentes.&nbsp;</FONT> </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las implicaciones del modelo, que seg&#250;n sus autores no pretende reemplazar  a la clasificaci&#243;n histopatol&#243;gica tradicional, trascienden hacia un nuevo  enfoque en la detecci&#243;n temprana y en el tratamiento de la enfermedad.  Ellos argumentaron que las t&#233;cnicas utilizadas en la actualidad, <I>vgr.</I> CA125  s&#233;rico y ultrasonido vaginal, no son efectivas en la identificaci&#243;n temprana  de los tumores tipo II, que muchas veces se originan en sitios extraov&#225;ricos  y cuando lo hacen en el propio ovario, se diseminan con rapidez fuera de  &#233;l. Por tal motivo, dichas t&#233;cnicas s&#243;lo ser&#237;an efectivas en el estad&#237;o  I de la progresi&#243;n maligna, cuando la enfermedad se encuentra confinada  al ovario, caracter&#237;stica que corresponde a los tumores tipo I. Como estrategias  v&#225;lidas para la detecci&#243;n temprana de los tumores tipo II, propusieron  en consecuencia, identificar ADN con p53 mutante y/o p&#233;ptidos provenientes  del tumor en los flu&#237;dos corporales, o bien, evaluar el volumen tumoral,  con posterioridad a la cirug&#237;a citorreductiva. La importancia del modelo  propuesto radica en el tipo de tratamiento aplicado, mediante la utilizaci&#243;n  de drogas que en forma selectiva podr&#237;an marcar las v&#237;as afectadas por  las mutaciones (147).<I>&nbsp;</I> </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> STATUS DE p53 EN EL C&#193;NCER OV&#193;RICO EPITELIAL. RELACI&#211;N CON PRON&#211;STICO, SOBREVIDA Y  RESPUESTA A LA QUIMIOTERAPIA&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En los tumores ov&#225;ricos malignos de origen epitelial, las mutaciones de  p53 constituyen el cambio gen&#233;tico m&#225;s frecuente (93, 148). Las alteraciones  son mayores que las reportadas en ovarios normales o en tumores benignos  y est&#225;n correlacionadas con la inactivaci&#243;n del gen (148-150), lo que hace  suponer que, bajo tales circunstancias, el tumor dispone de una ventaja  selectiva de crecimiento, con un mayor potencial de proliferaci&#243;n y malignidad  (93). Las alteraciones de p53 aparecen hasta en un 80% de carcinomas ov&#225;ricos,  as&#237; como en quistes de inclusi&#243;n (en presencia y en ausencia de atipia),  en endometriosis adyacente a tumores ov&#225;ricos y en ovarios removidos profil&#225;cticamente  en mujeres con historia familiar de c&#225;ncer (95, 151). El cambio m&#225;s frecuente  en el carcinoma ov&#225;rico epitelial, las mutaciones sin sentido simples (152),  se localizan en los dominios con mayor grado de conservaci&#243;n evolutiva  (II, III, IV y V) (<a href="#fig1">Fig. 1</a>) y est&#225;n acompa&#241;adas por la p&#233;rdida del alelo  normal remanente (153). Estos cambios han sido asociados con una mayor  agresividad y rapidez de la progresi&#243;n tumoral, as&#237; como con una menor  esperanza de vida, lo que se explica si se tiene en cuenta la inhibici&#243;n  resultante en la actividad transactivadora transcripcional de p53 sobre  sus genes blanco. As&#237;, la prevalencia de las mutaciones de p53 es mayor  en los estad&#237;os III y IV (40-70%) de la enfermedad, en comparaci&#243;n con  la reportada en los estad&#237;os I y II (alrededor de 30%) (154), lo que ha  llevado a pensar por una parte, que la alteraci&#243;n de p53 puede corresponder  a un evento tard&#237;o en la progresi&#243;n tumoral o bien, que la p&#233;rdida de p53  es la responsable de la mayor y m&#225;s agresiva proliferaci&#243;n de las c&#233;lulas  transformadas (109).</FONT></P> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Ante la apoptosis, las mutaciones sin sentido adoptan una conducta particular:  determinan una reducci&#243;n de la tasa de muerte inducida por ciertos f&#225;rmacos,  lo que confiere a las c&#233;lulas portadoras una ganancia selectiva de funci&#243;n  y disminuye la eficacia de la quimioterapia. Como resultado del cambio  mutacional de p53, su prote&#237;na anormal se acumula en el n&#250;cleo, evento  que ha sido demostrado en los tumores de alto grado, as&#237; como en estad&#237;os  avanzados del c&#225;ncer y en caso de quimiorresistencia, en especial a la  terapia basada en la administraci&#243;n de platino (cis y carboplatino). En  contraste, se ha determinado que los tumores ov&#225;ricos epiteliales con p53  mutado son sensibles a la terapia combinada platino-taxanes, lo que se  explica en raz&#243;n de la capacidad de los taxanes para inducir apoptosis  a trav&#233;s de mecanismos independientes de p53, como es la generaci&#243;n de  alteraciones en la funci&#243;n de los microt&#250;bulos (109, 155, 156). Al parecer,  el aumento en la sensibilidad a los taxanes resulta de la acumulaci&#243;n de  la prote&#237;na de p53 mutante en la fase G2/M del ciclo celular (157).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Existe consenso sobre la relaci&#243;n entre las alteraciones de p53 y la sobrevida  de las pacientes con c&#225;ncer ov&#225;rico epitelial. Sin embargo, no hay a&#250;n  consistencia entre los resultados de los diferentes estudios que han intentado  establecer un valor pron&#243;stico para cada mutaci&#243;n en particular sobre la  supervivencia global. Con relaci&#243;n a la prognosis del c&#225;ncer epitelial  ov&#225;rico, algunas investigaciones han otorgado valor al status de p53 como  indicador pron&#243;stico independiente (158-160), mientras que en otras no  se ha podido establecer asociaci&#243;n entre el status del gen y un mal pron&#243;stico  (161, 162). En este sentido, Hashiguchi y col. evaluaron en 2004 la correlaci&#243;n  entre las alteraciones en los componentes de las v&#237;as reguladoras del ciclo  celular p14ARF-mdm2-p53 (v&#237;a p53), p16-ciclinaD1/CDK4-pRB (v&#237;a RB) y ATM-chk2-CDC25-ciclinaB1/CDK1-RB  (v&#237;a G2) y el pron&#243;stico del c&#225;ncer epitelial ov&#225;rico humano. Seg&#250;n su  estudio, las v&#237;as RB y G2 pueden considerarse como factores pron&#243;sticos  independientes, en contraste con la v&#237;a p14ARF-mdm2-p53 a la que no fue  posible asignar un valor predictor significativo (162). Seg&#250;n Canevari  y col. (109), tal discrepancia podr&#237;a atribuirse a varias causas, entre  las que se encuentran un tama&#241;o de muestra y/o un dise&#241;o experimental sub&#243;ptimos,  la carencia de estudios prospectivos, o al hecho probable de que en forma  subyacente a la acumulaci&#243;n de p53 existan alteraciones de otros genes  reguladores de p53 que podr&#237;an provocar confusi&#243;n en la interpretaci&#243;n  de los resultados. Para Hashiguchi y col. (162), tambi&#233;n es factible que  dichos resultados obedezcan a que la relaci&#243;n entre la prognosis del c&#225;ncer  ov&#225;rico epitelial y el status de p53 est&#225; afectada por el tipo histol&#243;gico  de c&#225;ncer.</FONT></P> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Otros estudios han evaluado en forma simult&#225;nea los niveles de expresi&#243;n  de p53 y del tambi&#233;n supresor tumoral p21, con la finalidad de establecer  un adecuado pron&#243;stico del carcinoma derivado de ESO (151). De acuerdo  con sus resultados, cuando la expresi&#243;n de p21 est&#225; aumentada, es mejor  el pron&#243;stico, mientras que una baja expresi&#243;n es indicio de pobre sobrevivencia.  Si coexisten niveles bajos de p21 con una elevada expresi&#243;n de p53, la  esperanza de vida disminuye. Si por el contrario, la expresi&#243;n de p21 est&#225;  aumentada y la de p53 disminuida, ambos factores tomados en conjunto constituyen  un mejor indicador de buena prognosis y sobrevivencia de las pacientes  afectadas (151). Por otra parte, con relaci&#243;n a p53 y las prote&#237;nas de  la familia Bcl-2 en c&#233;lulas tumorales de ESO, existe evidencia de asociaci&#243;n  entre la disminuci&#243;n de Bcl-2 antiapopt&#243;tica y niveles elevados de p53,  lo que se explicar&#237;a con base en el efecto inhibitorio que &#233;ste ejerce  sobre Bcl-2 (149). Sin embargo, las pacientes con carcinoma ov&#225;rico Bcl-2  positivo tienen un mejor pron&#243;stico que aquellas con tumores p53 positivos-bcl-2  negativos (163).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Investigaciones recientes efectuadas en modelos de c&#225;ncer ov&#225;rico dan cuenta  de aproximaciones prote&#243;micas que han permitido generar an&#225;lisis proteicos  diferenciales, as&#237; como las primeras representaciones sistem&#225;ticas de la  enfermedad, lo que tendr&#225; necesaria repercusi&#243;n en cuanto a pron&#243;stico,  sobrevida y respuesta a la quimioterapia del c&#225;ncer ov&#225;rico epitelial (164-166).  Desde Hashiguchi y col. (148), pioneros en el an&#225;lisis simult&#225;neo de los  componentes de la v&#237;a p14ARF-mdm2-p53 que opera en el checkpoint G1/S del  ciclo celular, hasta Gagn&#233; y col. (167) quienes en 2007 evaluaron en forma  cuantitativa los perfiles de expresi&#243;n de prote&#237;nas involucradas en actividad  transcripcional, metabolismo celular, adhesi&#243;n o motilidad y organizaci&#243;n  del citoesqueleto, en dos l&#237;neas celulares de c&#225;ncer epitelial ov&#225;rico  -de alta y de baja malignidad- cada d&#237;a es m&#225;s claro que es el an&#225;lisis  de expresi&#243;n g&#233;nica diferencial el que ofrece mejores perspectivas en la  comprensi&#243;n de los cambios bioqu&#237;micos y moleculares asociados con la progresi&#243;n  tumoral, no s&#243;lo del epitelio superficial del ovario, sino de cualquier  otro tipo de tejido.&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> De acuerdo con las anteriores consideraciones, con el objetivo de predecir  la probable respuesta terap&#233;utica a drogas efectivas, es pertinente no  s&#243;lo establecer el status de p53, sino tambi&#233;n tomar en cuenta los niveles  de expresi&#243;n de otros genes relacionados.&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> p53 COMO BLANCO TERAP&#201;UTICO EN EL TRATAMIENTO DEL C&#193;NCER OV&#193;RICO EPITELIAL&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El estudio molecular de las c&#233;lulas cancerosas ha permitido avanzar en  el conocimiento de la complejidad de las redes de se&#241;alizaci&#243;n que hacen  posible su proliferaci&#243;n descontrolada y que, parad&#243;jicamente, constituyen  su tal&#243;n de Aquiles. Aunque debido a la p&#233;rdida de funci&#243;n de genes asociados  con la supresi&#243;n tumoral, la conexi&#243;n entre &#233;sta y la proliferaci&#243;n se  encuentra interrumpida, se trata de c&#233;lulas potencialmente vulnerables  a las terapias contra la enfermedad, pues los programas de senescencia  y apoptosis permanecen intactos y susceptibles por tanto de ser intervenidos  por el hombre.&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En este orden de ideas y en raz&#243;n de que muchos tipos de tumores han perdido  la funci&#243;n de p53, nuevas y diversas estrategias han estado orientadas  a su utilizaci&#243;n como blanco terap&#233;utico en diversos tipos de c&#225;ncer, entre  ellos el ov&#225;rico de origen epitelial.</FONT></P> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Restauraci&#243;n de la funci&#243;n normal de p53 mutante</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La b&#250;squeda de mol&#233;culas capaces de reactivar a p53 mutado est&#225; fundamentada  en la evidencia de que ellas pueden provocar un plegamiento en la prote&#237;na  alterada, para recuperar la estructura espacial requerida para interactuar  con sus pares funcionales, lo que no solo restablece la funci&#243;n normal  wild-type (WT), sino que adem&#225;s aumenta la actividad transactivadora del  gen, con la ventaja de no generar una respuesta inmune (138, 152). Esto  hace posible la apoptosis masiva, aunque las c&#233;lulas normales que tienen  baja expresi&#243;n de p53 permanecen inalteradas. Dentro de este grupo de drogas  se encuentran mol&#233;culas como <I>PRIMA-1, PRIMA-1</I><FONT COLOR="#1f1a17"><SUP><I>Met</I></SUP><I>, Cp-31398, CDB-3, MIRA-1,  WR1675, elipticina</I> y <I>prote&#237;na adaptadora quim&#233;rica, </I>entre otros.</FONT></FONT></P> <UL>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0">&nbsp;</P>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"> <I><FONT COLOR="#1f1a17"> PRIMA-1 </FONT></I> <FONT COLOR="#1f1a17">  (reactivador de p53 e inductor de apoptosis masiva), mediante mecanismos  a&#250;n no completamente aclarados, induce apoptosis en c&#233;lulas cancerosas  humanas con diferentes mutaciones de p53, sin afectar a las portadoras  de la forma WT. Esto lo hace &#250;nico entre todos los agentes quimioterap&#233;uticos  utilizados en la cl&#237;nica, y en especial de la cisplatina y el 5&#146;-fluorouracilo  que poseen mayor eficacia contra los tumores con p53WT(168). <I>PRIMA-1</I> activa  adem&#225;s la transcripci&#243;n de p21, mdm2 y PUMA, genes blanco que act&#250;an como  supresores tumorales (152, 153).<I>&nbsp;</I> </FONT></font></LI>     ]]></body>
<body><![CDATA[<LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"> <I><FONT COLOR="#1f1a17"> PRIMA-1</FONT></I><FONT COLOR="#1f1a17"><SUP><I>Met</I></SUP> por su parte, ha demostrado ser m&#225;s efectiva que PRIMA-1. Se  ha usado con &#233;xito en terapia conjunta con cisplatina con el fin de inducir  apoptosis en los tumores con formas mutadas de p53, usualmente quimiorresistentes  (169)<I>.</I> Su efecto, a&#250;n no totalmente dilucidado, parece estar relacionado  con la inducci&#243;n de la acumulaci&#243;n de p53 mutado en el nucleolo.<I>&nbsp;</I></FONT></font></LI>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"> <I><FONT COLOR="#1f1a17"> Cp-31398 </FONT></I> <FONT COLOR="#1f1a17">  es una estirilquinazolina que restaura la funci&#243;n normal de las  formas mutantes de p53 (en los nucle&#243;tidos 173, 241 y 249) y permite recuperar  la capacidad de transactivaci&#243;n transcripcional de p53 sobre p21/CDKN1  y BAX. Activa adem&#225;s las v&#237;as extr&#237;nseca e intr&#237;nseca de inducci&#243;n de la  apoptosis (170) e inhibe la ubiquitinaci&#243;n de p53 y la estabiliza. En adici&#243;n,  <I>Cp-31398</I> act&#250;a sobre p53WT, de modo que aumenta tanto su expresi&#243;n como  su actividad. Al igual que <I>PRIMA-1</I>, <I>Cp-31398</I> no tiene efectos t&#243;xicos demostrables  (153).<I>&nbsp;</I> </FONT></font></LI>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"> <I><FONT COLOR="#1f1a17"> CDB-3 </FONT></I> <FONT COLOR="#1f1a17">  es un p&#233;ptido de nueve amino&#225;cidos que presenta selectividad por  las c&#233;lulas tumorales con p53 mutado, sobre las que act&#250;a mediante diversos  mecanismos. Promueve la estabilizaci&#243;n de p53, corrige las prote&#237;nas mutadas,  induce la transcripci&#243;n de los genes blanco mdm2, GADD45a y p21 y activa  el programa de apoptosis (152, 171).&nbsp; </FONT></font></LI>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"> <I><FONT COLOR="#1f1a17"> MIRA-1 </FONT></I> <FONT COLOR="#1f1a17">  rescata la conformación espacial de la molécula y la función de las formas mutantes de p53 Gln-248, Tyr-176/Trp-248, His-175 y Trp-282  (153), a trav&#233;s de la modificaci&#243;n covalente de los residuos de ciste&#237;na.  Con los grupos tiol y amino las prote&#237;nas se unen por medio del grupo maleimida,  lo que evita la formaci&#243;n de puentes disulfuro que puedan interferir con  el plegamiento correcto y originar por tanto agregados proteicos inactivos.  Como inductor de la apoptosis, <I>MIRA-1 </I>act&#250;a en un tiempo cuatro veces menor  que PRIMA-1 con una mayor potencia (172).&nbsp; </FONT></font></LI>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"> <I><FONT COLOR="#1f1a17"> WR1065 </FONT></I> <FONT COLOR="#1f1a17">  es un derivado de la amifostina, agente quimio y radioprotector  utilizado en el tratamiento contra el c&#225;ncer. Act&#250;a tanto en tumores p53WT  mediante mecanismos redox-dependientes, as&#237; como en c&#233;lulas con la mutaci&#243;n  p53Met272, en las que restaura la funci&#243;n WT y activa la transcripci&#243;n  de genes blanco (172-174).</FONT></font></LI> <UL> <MULTICOL GUTTER="31" COLS="2">     ]]></body>
<body><![CDATA[</ul>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La <I>elipticina</I> pertenece a una familia de compuestos de tipo alcaloide derivados  de la planta australiana <I>Ochrosia elliptica</I>, con actividad centrada en  el rescate y restauraci&#243;n de la funci&#243;n WT de las prote&#237;nas mutantes His-175,  Trp-248, Ser-249 e His-273. El mecanismo de acci&#243;n posiblemente obedece  a la alteraci&#243;n de la fosforilaci&#243;n de p53 y a la inhibici&#243;n de enzimas  celulares como CDK, topoisomerasa 2 y case&#237;n kinasa II. Por otra parte  induce la transcripci&#243;n de p21 y mdm2. No obstante, su utilizaci&#243;n ha sido  restringida debido a que produce<I> </I>efectos colaterales indeseables (171,175)<I>.</I>&nbsp; </FONT></LI>     <LI>       <p style="word-spacing: 0; line-height: 100%; margin-bottom: 0" align="justify"><font face="Verdana" size="2"> <I><FONT COLOR="#1f1a17"> Prote&#237;na adaptadora quim&#233;rica. </FONT></I> <FONT COLOR="#1f1a17">  A partir de los dominios de tetramerizaci&#243;n  y uni&#243;n a ADN de p73 (miembro de la familia de proteinas relacionadas con  p53) y de oligomerizaci&#243;n de p53 se construy&#243; una prote&#237;na adaptadora que  hace las veces de puente entre el gen p53 mutado y sus secuencias blanco  de ADN. Como resultado, activa la transcripci&#243;n de los genes blanco de  p53, en presencia de la forma mutada de dicho gen (176).</FONT></font></LI>     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Terapia g&#233;nica</FONT></B><FONT COLOR="#1f1a17">&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Reconstituci&#243;n de p53 WT. </FONT></B> <FONT COLOR="#1f1a17">  En a&#241;os recientes se han llevado a cabo investigaciones  con el objetivo de lograr una funci&#243;n &#243;ptima de p53 en c&#233;lulas tumorales  con el gen mutado. As&#237;, se han desarrollado t&#233;cnicas basadas en la introducci&#243;n  de p53 ex&#243;geno a trav&#233;s de vectores como retro y adenovirus, as&#237; como de  derivados de vacunas (152). Los ensayos en diversos tipos de carcinomas  (pr&#243;stata, cabeza y cuello o pulmonar de c&#233;lulas-no-peque&#241;as), con vectores  adenovirales (tanto competentes como deficientes en cuanto a replicaci&#243;n)  que reconstituyen la funci&#243;n de p53, parecen promisorios (177-180). Sin  embargo, en pacientes con c&#225;ncer ov&#225;rico, distan de ser alentadores. A  un grupo de &#233;stas, con tumores estad&#237;o III con p53 mutado, se les administr&#243;  v&#237;a intraperitoneal un vector adenoviral p53 WT (con deficiencia replicativa),  en forma simult&#225;nea con la quimioterapia est&#225;ndar carboplatina y paclitaxel.  Seg&#250;n Zeimet y Marth (128), no se obtuvieron resultados exitosos por varias  razones, entre otras por la baja eficacia del sistema vector adenoviral  para unirse a los receptores CAR (del ingl&#233;s coxsackie-adenovirus vector)  y a las integrinas clase anb3 y anb5, la inmunidad celular innata antiadenoviral,  la incapacidad de la prote&#237;na producida para restaurar por s&#237; sola toda  la v&#237;a de se&#241;alizaci&#243;n deshabilitada, la inactivaci&#243;n de las v&#237;as en las  que participa el gen a trav&#233;s de su posible desregulaci&#243;n epigen&#233;tica,  as&#237; como tambi&#233;n debido al efecto dominante negativo de la forma mutada,  que impide la tetramerizaci&#243;n de la prote&#237;na normal introducida, afectando  la funci&#243;n transactivadora (128).&nbsp; </FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Marcaje con adenovirus E1B deficientes. </FONT> </B><FONT COLOR="#1f1a17"> Tambi&#233;n se ha utilizado el marcaje  de las c&#233;lulas cancerosas con ONYX-015. Este adenovirus carece de E1B55kD,  prote&#237;na que inactiva p53 e inhibe por tanto la apoptosis de las c&#233;lulas  normales infectadas. Por tanto, cuando las c&#233;lulas con p53 mutado son infectadas  con ONYX-015, &#233;ste puede replicarse libremente y provocar la muerte celular  (171). La administraci&#243;n de ONYX-015 ha demostrado ser m&#225;s eficaz cuando  se utiliza en combinaci&#243;n con quimioterapia (181), y en especial aplicado  directamente sobre ciertos tipos de tumores (182, 183). En pacientes con  c&#225;ncer ov&#225;rico recurrente por el contrario, a&#250;n no existe evidencia concluyente  acerca de la efectividad de ONYX-015 como agente terap&#233;utico de primera  linea (184).</FONT></font></P> <UL> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     ]]></body>
<body><![CDATA[</ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Activaci&#243;n de p53WT. </FONT> </B><FONT COLOR="#1f1a17"> Esta estrategia reviste especial utilidad en el caso  de c&#233;lulas tumorales que si bien no presentan mutaciones en p53, tienen  alteraciones que se traducen en una pobre estabilizaci&#243;n y activaci&#243;n del  gen. Sin embargo, es posible lograr la acumulaci&#243;n de p53 y la posterior  activaci&#243;n de sus genes blanco mediante mol&#233;culas inhibidoras de la interacci&#243;n  p53-dm2 (el an&#225;logo humano de mdm2) (185-187), como la nutlina 3 y RITA,  que pueden ser utilizados solos o en combinaci&#243;n con radiaci&#243;n o con quimioterapia  (188).&nbsp; </FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La nutlina 3, un an&#225;logo <I>cis-</I>imidazol, mimetiza a los residuos de p53 que  interact&#250;an con mdm2, a saber Phe-19, Trp-23 y Leu-26 (153). El resultado  es la disminuci&#243;n de la afinidad de p53 por mdm2, con la consiguiente estabilizaci&#243;n  de la prote&#237;na p53 e inhibici&#243;n de la ubiquitinaci&#243;n y la degradaci&#243;n proteasomal  (189).<I> </I>A&#250;n no se sabe con exactitud que tan precisa es la nutlina 3 en  cuanto a su selectividad por las c&#233;lulas tumorales, lo que representa un  obst&#225;culo para su utilizaci&#243;n, si se tiene en cuenta que probablemente  tambi&#233;n activa a p53 en c&#233;lulas normales (39, 152)<I>.</I> RITA por su parte,  es un derivado furano que se une al extremo N-terminal de p53, de modo  que evita su interacci&#243;n con mdm2, tanto <I>in vitro</I> como <I>in vivo </I>(190). Esto  hace que p53 se acumule, con la consiguiente activaci&#243;n de sus genes blanco.  En adici&#243;n, la inducci&#243;n de la apoptosis mediada por RITA depende de la  presencia de p53WT en c&#233;lulas tumorales, con poco efecto sobre las c&#233;lulas  normales, como ha sido demostrado en estudios realizados en ratones (153).  La interacci&#243;n p53-mdm2 tambi&#233;n es utilizada en la actualidad como blanco  para la acci&#243;n de p&#233;ptidos peque&#241;os, entre los que se encuentran un p&#233;ptido  mim&#233;tico basado en tript&#243;fano (190), as&#237; como p&#233;ptidos sint&#233;ticos correspondientes  a ciertos fragmentos de la secuencia de p53 (170) que no s&#243;lo estabilizan  a p53 con una gran eficiencia o restauran su forma mutante, sino adem&#225;s  inducen la consecuente v&#237;a apopt&#243;tica.&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La actividad mdm2 puede ser tambi&#233;n objeto de marcaje, con el fin de disminuir  la afinidad de p53 por dicha prote&#237;na. Para esto se han utilizado los compuestos  HLI98, que inhiben la actividad E3 ligasa de mdm2. Como consecuencia, p53  se acumula, induce la expresi&#243;n de sus genes blanco y activa el proceso  de apoptosis (187).&nbsp; </FONT></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><font face="Verdana" size="2"> <B><FONT COLOR="#1f1a17"> Inhibici&#243;n de la activaci&#243;n de p53WT</FONT></B><FONT COLOR="#1f1a17"><B>. </B>Aunque el buen sentido indica que  restaurar la funci&#243;n normal de p53 es beneficioso pues deber&#237;a aumentar  la eficacia de la quimioterapia, evidencias en sentido opuesto, obtenidas  en estudios con c&#233;lulas epiteliales ov&#225;ricas cancerosas, demuestran que  las consecuencias inmediatas de dicha acci&#243;n, como la detenci&#243;n del ciclo  y posterior reparaci&#243;n del ADN, constituyen un impedimento para lograr  el objetivo de la quimioterapia en cuanto a la generaci&#243;n del da&#241;o del  ADN (191). Por otra parte, debe tenerse en cuenta que<I> </I>la inhibici&#243;n de  p53 proteger&#237;a a las c&#233;lulas normales de los efectos colaterales asociados  a la quimioterapia, lo que justifica el inter&#233;s cada vez mayor en investigar  acerca de las consecuencias de inactivar dicho gen (38, 192).&nbsp;</FONT></font></P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> PERSPECTIVAS&nbsp; </FONT></B> </P>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Debido a la aparici&#243;n de quimiorresistencia, s&#243;lo un 30% de las pacientes  con c&#225;ncer derivado del epitelio superficial del ovario logran sobrevivir  m&#225;s de 18 meses, despu&#233;s de la aplicaci&#243;n de quimioterapia de primera l&#237;nea,  sin importar que antes del tratamiento existiese susceptibilidad a las  drogas utilizadas. En raz&#243;n del papel relevante que juega p53 en eventos  tales como histog&#233;nesis, mutag&#233;nesis y oncog&#233;nesis de ESO, el conocimiento  de las v&#237;as de se&#241;alizaci&#243;n en las que est&#225; implicado, tanto en c&#233;lulas  normales como cancerosas de este tejido, provee las herramientas necesarias  para prevenir y detener tanto la transformaci&#243;n maligna como la resistencia  a los f&#225;rmacos anticancerosos.</FONT></P> <UL> <UL> <MULTICOL GUTTER="31" COLS="2">     </ul>     </ul>     <P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> A pesar de que en los &#250;ltimos a&#241;os se han obtenido mol&#233;culas peque&#241;as que  permiten restablecer algunas de las funciones de p53, se requieren mayores  esfuerzos en la investigaci&#243;n que incluyan an&#225;lisis fundamentados en farmacogen&#233;tica,  prote&#243;mica y metabol&#243;mica, que hagan posible la identificaci&#243;n del andamiaje  molecular sobre el que se apoya el gen en los tumores humanos. Esto facilitar&#225;  el hallazgo de compuestos m&#225;s potentes, no s&#243;lo con un efecto antitumoral  significativo, sino adem&#225;s con baja citotoxicidad y con un perfil farmacodin&#225;mico  apropiado, que permitan una mejor aproximaci&#243;n terap&#233;utica para el tratamiento  del c&#225;ncer derivado del epitelio superficial del ovario.&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> REFERENCIAS&nbsp; </FONT></B> </P>     <!-- ref --><P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> 1.&nbsp;</FONT><font face="Verdana" size="2"><B><FONT COLOR="#1f1a17">De Leo AB, Jay G, Appella E, Dubois GC, Law LW, Old LJ. </FONT> </B><FONT COLOR="#1f1a17"> Detection of a  transformation-related antigen in chemically induced sarcomas and other  transformed cells of the mouse. Proc Natl Acad Sci USA 1979; 76:2420-2424.&nbsp; </FONT></font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1165752&pid=S0535-5133200800040001100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><P align="justify" style="word-spacing: 0; line-height: 100%; margin-bottom: 0"><FONT COLOR="#1f1a17" size="2" face="Verdana"> 2.&nbsp;</FONT><font face="Verdana" size="2"><B><FONT COLOR="#1f1a17">Prives C, </FONT> </B><FONT COLOR="#1f1a17"> Hall PA. The p53 pathway. 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