<?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>S0535-51332006000200009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Metaloproteasas en la progresión tumoral: Revisión]]></article-title>
<article-title xml:lang="en"><![CDATA[Metalloproteinases and tumor progression]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arvelo]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cotte]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Central de Venezuela Facultad de Ciencias Instituto de Biología Experimental]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<volume>47</volume>
<numero>2</numero>
<fpage>185</fpage>
<lpage>205</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0535-51332006000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0535-51332006000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0535-51332006000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las dos propiedades biológicas que determinan la malignidad en el cáncer son la infiltración y la metástasis, lo cual ha llevado al estudio de todos los mecanismos que tienen que ver tanto con la invasión de las células tumorales como con la relación de estas células con su estroma, con el cual interactúan produciendo factores que provoca la movilización y acumulación de células inflamatorias, formación de nuevos vasos sanguíneos, multiplicación de fibroblastos y síntesis de componentes de la matriz extracelular. La invasión tumoral está mediada por diversas enzimas, en particular las proteasas, que degradan la matriz extracelular y cuyos productos facilitan la progresión tumoral, destacando entre ellas las metaloproteasas (MMP), que al jugar un papel importante en la biología del cáncer, son blanco potencial para usarlas en la terapia contra esta enfermedad. Por ello inhibidores sintéticos de las metaloproteasas ya han sido desarrollados, que si bien han presentando actividad antitumoral al usarse en varios modelos animales, en estudios clínicos hechos en pacientes con cánceres avanzados no se ha logrado, hasta ahora, obtener una respuesta terapéutica efectiva. Dada la importancia y significado biológico y clínico de estas investigaciones, este artículo resume el papel que desempeñan las metaloproteasas en la promoción tumoral, proliferación celular, invasión tumoral y la angiogénesis]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The two biological characteristics that determine the malignancy of cancer are infiltration and metastasis. The study of these mechanisms is related to the invasion of tumoral cells and the relationship of these cells with their stroma, which interact producing the movement and accumulation of inflammatory cells, the formation of new blood vessels, multiplication of fibroblasts and the synthesis of the components of the extra cellular matrix production. Tumoral invasion is conditioned through various enzyme activities, in particular proteases which degrade the matrix, thus facilitating the progression of the tumor. The metalloproteinases (MMP) are a family of proteinases that play an important role in cancer as well as in numerous other diseases. MMP are, therefore, a potential factor in cancer therapy. Several synthetic MMP inhibitors have been developed and have shown successful anti-tumor activity in a variety of animal species, but in clinical studies of patients with advanced forms of cancer, this therapeutic strategy has not resulted as effective. In this article, due to the biological and clinical importance of this therapy, we summarize the current views on the role of metalloproteinases (MMP) in tumor promotion, proliferation, invasion, metastasis and angiogenesis]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cáncer]]></kwd>
<kwd lng="es"><![CDATA[invasión]]></kwd>
<kwd lng="es"><![CDATA[metástasis]]></kwd>
<kwd lng="es"><![CDATA[progresión tumoral]]></kwd>
<kwd lng="es"><![CDATA[metaloproteasas]]></kwd>
<kwd lng="en"><![CDATA[Cancer]]></kwd>
<kwd lng="en"><![CDATA[invasion]]></kwd>
<kwd lng="en"><![CDATA[metastasis]]></kwd>
<kwd lng="en"><![CDATA[tumor progression]]></kwd>
<kwd lng="en"><![CDATA[metalloproteinases]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <BASEFONT SIZE="3">     <P ALIGN="center"> <B><font color="#1f1a17" face="Verdana" size="3">Metaloproteasas en la progresi&#243;n tumoral. Revisi&#243;n.&nbsp;</font></B> </P>     <P ALIGN="center"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Francisco Arvelo y Carlos Cotte.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Laboratorio de Cultivo de Tejidos y Biolog&#237;a de Tumores, Instituto de Biolog&#237;a  Experimental, Facultad de Ciencias, Universidad Central de Venezuela, Apartado  47114, Caracas, Venezuela. Correo electr&#243;nico: franarvelo@yahoo.com&nbsp; </FONT></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> Resumen. </FONT> </B><FONT COLOR="#1f1a17" size="2"> Las dos propiedades biol&#243;gicas que determinan la malignidad en  el c&#225;ncer son la infiltraci&#243;n y la met&#225;stasis, lo cual ha llevado al estudio  de todos los mecanismos que tienen que ver tanto con la invasi&#243;n de las  c&#233;lulas tumorales como con la relaci&#243;n de estas c&#233;lulas con su estroma,  con el cual interact&#250;an produciendo factores que provoca la movilizaci&#243;n  y acumulaci&#243;n de c&#233;lulas inflamatorias, formaci&#243;n de nuevos vasos sangu&#237;neos,  multiplicaci&#243;n de fibroblastos y s&#237;ntesis de componentes de la matriz extracelular.  La invasi&#243;n tumoral est&#225; mediada por diversas enzimas, en particular las  proteasas, que degradan la matriz extracelular y cuyos productos facilitan  la progresi&#243;n tumoral, destacando entre ellas las metaloproteasas (MMP),  que al jugar un papel importante en la biolog&#237;a del c&#225;ncer, son blanco  potencial para usarlas en la terapia contra esta enfermedad. Por ello inhibidores  sint&#233;ticos de las metaloproteasas ya han sido desarrollados, que si bien  han presentando actividad antitumoral al usarse en varios modelos animales,  en estudios cl&#237;nicos hechos en pacientes con c&#225;nceres avanzados no se ha  logrado, hasta ahora, obtener una respuesta terap&#233;utica efectiva. Dada  la importancia y significado biol&#243;gico y cl&#237;nico de estas investigaciones,  este art&#237;culo resume el papel que desempe&#241;an las metaloproteasas en la  promoci&#243;n tumoral, proliferaci&#243;n celular, invasi&#243;n tumoral y la angiog&#233;nesis.&nbsp; </FONT></font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> Palabras clave:&nbsp;</FONT></B><FONT COLOR="#1f1a17" size="2"> C&#225;ncer, invasi&#243;n, met&#225;stasis, progresi&#243;n tumoral, metaloproteasas.&nbsp;</FONT></font></P>     <P ALIGN="center"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana">Metalloproteinases and tumor progression.</FONT></B></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> Abstract. </FONT></B> <FONT COLOR="#1f1a17" size="2">  The two biological characteristics that determine the malignancy  of cancer are infiltration and metastasis. The study of these mechanisms  is related to the invasion of tumoral cells and the relationship of these  cells with their stroma, which interact producing the movement and accumulation  of inflammatory cells, the formation of new blood vessels, multiplication  of fibroblasts and the synthesis of the components of the extra cellular  matrix production. Tumoral invasion is conditioned through various enzyme  activities, in particular proteases which degrade the matrix, thus facilitating  the progression of the tumor. The metalloproteinases (MMP) are a family  of proteinases that play an important role in cancer as well as in numerous  other diseases. MMP are, therefore, a potential factor in cancer therapy.  Several synthetic MMP inhibitors have been developed and have shown successful  anti-tumor activity in a variety of animal species, but in clinical studies  of patients with advanced forms of cancer, this therapeutic strategy has  not resulted as effective. In this article, due to the biological and clinical  importance of this therapy, we summarize the current views on the role  of metalloproteinases (MMP) in tumor promotion, proliferation, invasion,  metastasis and angiogenesis.&nbsp; </FONT></font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> Key words:&nbsp;</FONT></B><FONT COLOR="#1f1a17" size="2"> Cancer, invasion, metastasis, tumor progression, metalloproteinases.&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Recibido: 05-05-2005. Aceptado: 08-09-2005.&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> INTRODUCCI&#211;N&nbsp; </FONT></B> </P>     <P ALIGN="justify"><font face="Verdana" size="2"> La invasi&#243;n es una caracter&#237;stica com&#250;n a casi todos los tumores malignos,  y microsc&#243;picamente resulta evidente cuando se observa la composici&#243;n del  tejido vecino a un c&#225;ncer, constituido por c&#233;lulas neopl&#225;sicas y no neopl&#225;sicas  (1). En algunos tumores, las c&#233;lulas malignas se mezclan con las normales  o las sustituyen, pero permanecen confinadas en el plano en que se originaron.  Por ejemplo, las c&#233;lulas de un carcinoma epidermoide del cuello uterino  pueden reemplazar a las c&#233;lulas normales en un espesor de varios mil&#237;metros  sin romper la membrana basal ni pasar al tejido adyacente. Estos tumores  se denominan carcinomas <i>in situ</i>, pero los mismos, con el tiempo y de no  diagnosticarse y tratarse, rompen la membrana basal y crecen en el estroma  que los rodea, transform&#225;ndose en carcinomas infiltrantes, cuyo patr&#243;n  de invasi&#243;n puede haberse desarrollado en una fase muy precoz de la progresi&#243;n  tumoral (2). La invasi&#243;n del tejido adyacente al tumor primario y la migraci&#243;n  de las c&#233;lulas malignas a &#243;rganos distantes, fen&#243;meno denominado met&#225;stasis,  son las caracter&#237;sticas m&#225;s funestas del c&#225;ncer (3, 4). Si esta propiedad  de invadir no existiera, la extirpaci&#243;n quir&#250;rgica bastar&#237;a para controlar  la mayor parte de los tumores malignos, y ello no constituir&#237;a el mayor  problema que enfrentan los pacientes con c&#225;ncer. Las c&#233;lulas malignas,  al ser capaces de invadir y producir met&#225;stasis, a lo cual hay que sumar  la resistencia que pueden desarrollar ante las drogas antitumorales, hacen  que los tratamientos usados para controlar la enfermedad no sean efectivos  para todos los pacientes con c&#225;ncer (4-7).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana" size="2"> La capacidad de metastatizar es un fen&#243;meno complejo, como se se&#241;ala en  la <a href="#f1"> Fig.&nbsp;1</a>, que requiere, al menos, cinco pasos: a) invasi&#243;n por las c&#233;lulas  tumorales de las estructuras adyacentes, como las membranas basales; b)  paso hacia la sangre o los vasos linf&#225;ticos con liberaci&#243;n de c&#233;lulas tumorales  hacia la circulaci&#243;n, fen&#243;meno denominado <i>intravasaci&#242;n</i>; c) supervivencia  de las c&#233;lulas tumorales en la sangre circulante y superaci&#243;n de la vigilancia  inmunol&#243;gica; d) escape de la circulaci&#243;n, fen&#243;meno conocido como <i>extravasaci&#243;n</i>;  e) implantaci&#243;n en un tejido diferente, extra&#241;o, con formaci&#243;n de un nuevo  foco tumoral (8). En el momento de efectuarse la detecci&#243;n de un c&#225;ncer,  cerca de la mitad de los pacientes tienen evidencias de focos metast&#225;sicos,  siendo factible que muchos m&#225;s tengan met&#225;stasis ocultas, por lo que algunos  onc&#243;logos cl&#237;nicos piensan que siempre debe considerarse que al momento  del diagnostico, ya hay c&#233;lulas dispersas, aun cuando las mismas no hayan  sido detectadas, por lo que ellos piensan que en el tratamiento siempre  deber&#237;a considerarse esta posibilidad (9). Las met&#225;stasis pueden ser detectadas  cuando el tumor primario es muy peque&#241;o, menos de 0,5 cm de di&#225;metro, pero  en general, con la mayor&#237;a de los tipos de c&#225;ncer, el incremento de tama&#241;o  del tumor primario se correlaciona con el aumento de la posibilidad de  met&#225;stasis, lo cual no es verdad cuando se hacen comparaciones entre diferentes  tipos de c&#225;ncer, ya que si bien ellos pueden tener similar tama&#241;o, pueden  tener, en tiempo, velocidades variables de met&#225;stasis. Todo esto nos indica  que la diseminaci&#243;n tumoral es un fen&#243;meno complejo y de dif&#237;cil soluci&#243;n,  ya que, pese a los grandes avances alcanzados en el tratamiento convencional  del c&#225;ncer por el perfeccionamiento de los tratamientos con radioterapia,  quimioterapia y las nuevas t&#233;cnicas quir&#250;rgicas, la mayor&#237;a de los decesos  por c&#225;ncer siguen siendo el resultado del no control de la diseminaci&#243;n  tumoral.&nbsp;</font></P>     <p ALIGN="center"><a name="f1"><img border="0" src="/img/fbpe/ic/v47n2/art09img01.gif" width="399" height="392"></a></p>     
<P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Casi todos los carcinomas nacen de las capas de c&#233;lulas epiteliales que  reposan sobre una membrana basal compuesta por proteoglicanos densos, constituyendo  una barrera a la diseminaci&#243;n precoz del tumor. Ante esta protecci&#243;n y  defensa, los tumores invasores suelen secretar enzimas capaces de degradar  esta barrera f&#237;sica (<FONT COLOR="#000000" FACE="Caslon224 Bk BT" SIZE="3">10</FONT><FONT COLOR="#1f1a17">), siendo la expresi&#243;n de tales enzimas un paso  indispensable en la invasi&#243;n de las estructuras y capas celulares adyacentes,  as&#237; como en todos los mecanismos que tienen que ver con los fen&#243;menos de  circulaci&#243;n tanto sangu&#237;nea como linf&#225;tica. Investigaciones recientes que  evidencian la implicaci&#243;n fundamental de las proteasas en los procesos  de invasi&#243;n tumoral est&#225;n permitiendo el avance de estrategias terap&#233;uticas  potenciales, y es por esta raz&#243;n que el estudio de las enzimas proteol&#237;ticas,  y su papel en los procesos fisiol&#243;gicos y patol&#243;gicos sean fundamentales,  por cuanto se pudiese llegar a dise&#241;ar probables agentes terap&#233;uticos contra  el c&#225;ncer basados en la inhibici&#243;n y control de la acci&#243;n de estas enzimas.&nbsp;</FONT> </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Entre las enzimas proteol&#237;ticas m&#225;s representativas implicadas en los procesos  de diseminaci&#243;n de tumores se incluye las <I>metaloproteasas</I>, de las cuales  hablaremos en esta revisi&#243;n en sus diferentes tipos y su papel fundamental  en los mecanismos de infiltraci&#243;n y met&#225;stasis, dos de los mayores obst&#225;culos  del &#233;xito de los tratamientos contra el c&#225;ncer&nbsp; </FONT></P>     <P ALIGN="justify"><B><FONT COLOR="#1f1a17" size="2" face="Verdana"> PAPEL DE LAS ENZIMAS PROTEOL&#205;TICAS EN LA INFILTRACI&#211;N Y LA MET&#193;STASIS&nbsp; </FONT></B> </P>     <P ALIGN="justify"><font face="Verdana" size="2"> Para lograr producir una met&#225;stasis, las c&#233;lulas malignas de un tumor primario  deben invadir a trav&#233;s de las c&#233;lulas de los tejidos del hu&#233;sped y la matriz  extracelular (MEC), entrar a la circulaci&#243;n, llegar a una cama vascular  distante, extravasarse y penetrar la MEC para pasar a los intersticios  de un &#243;rgano blanco, proliferar como una nueva colonia e inducir la formaci&#243;n  de nuevos vasos que hagan posible mantener su crecimiento (11). Para que  la mayor&#237;a de estos pasos ocurran se requiere de la liberaci&#243;n de enzimas  proteol&#237;ticas, por lo que el potencial invasivo y metast&#225;sico de las c&#233;lulas  malignas ha sido correlacionado con la acci&#243;n de varias proteasas, actividad  que no solo es caracter&#237;stica del c&#225;ncer, sino que tambi&#233;n lo es de las  c&#233;lulas normales involucradas en un significativo numero de procesos naturales.  La reparaci&#243;n de los tejidos normales, remodelaci&#243;n de los tejidos durante  el desarrollo, remodelaci&#243;n mamaria despu&#233;s de la lactancia, implantaci&#243;n  del blastocito, crecimiento de la placenta, la angiog&#233;nesis y muchos m&#225;s  ocurren gracias al concurso y acci&#243;n de las enzimas proteol&#237;ticas. Esta  realidad es de una importancia muy particular, ya que demuestra que la  producci&#243;n de altos niveles de actividad proteol&#237;tica extracelular no es  exclusiva de estados neopl&#225;sicos, sino que tambi&#233;n representa la expresi&#243;n  de funciones celulares normales. Si bien en el c&#225;ncer esta actividad es  inapropiada y lesiva para el organismo, la caracter&#237;stica com&#250;n de estos  fen&#243;menos fisiol&#243;gicos en los procesos normales y patol&#243;gicos, es que los  mismos est&#225;n involucrados en el rompimiento de barreras histol&#243;gicas, como  lo son la l&#225;mina basal y el estroma intersticial, lo cual causa cambios  pasajeros o permanentes en la arquitectura de los tejidos (12-14). En el  caso de la remodelaci&#243;n normal, contrapuesto a lo que ocurre con los tumores  malignos, las proteasas tienen en contrapartida inhibidores, lo cual significa  la existencia de mecanismos de regulaci&#243;n que mantiene un balance delicadamente  controlado mediante dispositivos que involucran, por ejemplo, la liberaci&#243;n  local de factores de crecimiento, mecanismos de retroalimentaci&#243;n, etc.  As&#237;, en los procesos de remodelaci&#243;n normales, como los ya se&#241;alados, hay  un proceso regulador efectivo que controla la liberaci&#243;n de las proteasas,  inhibi&#233;ndolas, una vez que ellas han concluido su trabajo. Todo lo contrario  ocurre con los tumores metast&#225;sicos, los cuales han perdido o no responden  a estos mecanismos de control (15, 16). Los primeros indicios de que las  proteasas estaban involucradas en el proceso de invasi&#243;n en c&#225;ncer se remontan  a los estudios iniciales realizados con cultivos de tejidos a principios  del siglo XX, ya que, en ese tiempo se usaba preferentemente el co&#225;gulo  de plasma como sustrato para el crecimiento de los tejidos. Con esta t&#233;cnica  se observ&#243; que los tejidos provenientes de tumores malignos ten&#237;an la capacidad  de disolver los co&#225;gulos de plasma, mientras que los tejidos normales no  pose&#237;an esa capacidad, por lo que Fischer, en 1925, propuso que este fen&#243;meno  podr&#237;a estar relacionado con la degradaci&#243;n de la fibrina, y que a su vez  ello estaba asociado al crecimiento invasivo de tumores, sugiriendo que  un agente l&#237;tico producido por las c&#233;lulas malignas era el responsable  de la degradaci&#243;n del co&#225;gulo de fibrina (17). </font><FONT COLOR="#1f1a17" size="2" face="Verdana">  Investigaciones posteriores  confirmaron la observaci&#243;n inicial de Fisher, y hoy ya sabemos que las  proteasas juegan un papel fundamental en la progresi&#243;n del c&#225;ncer, siendo  utilizadas en tres de los eslabones fundamentales que constituyen la cadena  de eventos que llevan a la invasi&#243;n tumoral mediante la infiltraci&#243;n y  la met&#225;stasis, como lo son la invasi&#243;n del sitio de crecimiento primario;  la lisis de la membrana basal, y la invasi&#243;n del sitio de la met&#225;stasis.  De las cinco clases de proteasas existentes, dos de ellas destacan en los  procesos de degradaci&#243;n proteol&#237;tica observada en el c&#225;ncer, categorizadas  de acuerdo a si ellas requieren Zn<SUP>2+ </SUP>o Ca<SUP>2+</SUP> o no, llamadas as&#237; <I>metaloproteasas</I>,  que incluyen, por ejemplo, las colagenasas Tipo I y IV. El mejor ejemplo  de una de las no metaloproteasas es el plasmin&#243;geno, que tiene un residuo  de serina en el sitio activo, y por tanto pertenece a la clase de las serinproteasas.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Una caracter&#237;stica com&#250;n a estas dos categor&#237;as de proteasas es que ellas  son secretadas como proenzimas inactivadas, las cuales deben ser activadas  por otras proteasas, como es se&#241;alado en la <a href="#f2"> Fig. 2</a>. Inhibidores tisulares  de la activaci&#243;n tambi&#233;n existen, pero de tal forma que la invasi&#243;n puede  ser influenciada por alguno de estos tres componentes: la cantidad de pro  enzima, el activador y el inhibidor.&nbsp; </FONT></P>     <P ALIGN="center"><a name="f2"><img border="0" src="/img/fbpe/ic/v47n2/art09img02.gif" width="331" height="410"></a></P>     
]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Cada uno de ellos, puede ser producido por las c&#233;lulas normales, pero su  balance es alterado en el c&#225;ncer, favoreci&#233;ndose la proteolisis. En el  caso del plasmin&#243;geno este es convertido a la proteasa activa <I>plasmina</I>  por otras proteasas llamadas <I>activadores del plasmin&#243;geno</I>, que a la vez  pueden convertir a la proenzima en la forma inactivadora, como se se&#241;ala  esquem&#225;ticamente en la <a href="#f3"> Fig. 3</a>. As&#237;, los activadores del plasmin&#243;geno son  categorizados como tipo-tejido (tPA) o tipo-uroquinasa (uPA), nomenclatura  que puede llevar a cierta confusi&#243;n al estar hecha en base a su caracterizaci&#243;n  original, ya que uPA es m&#225;s importante en la proteolisis de los tejidos,  en tanto que la primera funci&#243;n de la tPA es disolver los co&#225;gulos de plasma.  Los anticuerpos contra uPA inhiben la invasi&#243;n en tanto que su sobre expresi&#243;n  tiene el efecto opuesto y los inhibidores sint&#233;ticos, como lo es el amilorida,  tambi&#233;n decrecen el numero de colonias metast&#225;sicas en los modelos ensayados.  Las metaloproteasas son tambi&#233;n secretadas como proenzimas que pueden ser  proteol&#237;ticamente activadas por la plasmina, la cual tiene as&#237; un rol doble  al provocar la lisis de la matriz extracelular, as&#237; como activar otras  proteasas. Los inhibidores tisulares de las metaloproteasas o TIMP, tambi&#233;n  bloquean la activaci&#243;n, y en el caso de la colagenasa tipo IV ella incrementa  la dispersi&#243;n metast&#224;sica en los sistemas experimentales, en tanto que  los TIMP los decrece.&nbsp; </FONT></P>     <p ALIGN="center"><font size="2" face="Verdana">&nbsp; </font> <a name="f3"><img border="0" src="/img/fbpe/ic/v47n2/art09img03.gif" width="356" height="476"></a>     
<P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Es importante se&#241;alar que la metaloproteasas y serinproteasas, seguidas  por las cisteinproteasas, constituyen los grupos de proteasas con mayor  n&#250;mero de miembros, habiendo sido se&#241;alado que hasta el momento han sido  caracterizadas para el primer grupo 186 y para el segundo176. Las cisteinproteasas  son 143 y los otros dos grupos restantes, las treoninproteasas y aspartilproteasas  son muy bajas en el n&#250;mero de sus miembros, menos de treinta para cada  grupo, siendo altamente especializadas (<FONT COLOR="#000000" FACE="Caslon224 Bk BT" SIZE="3">18</FONT><FONT COLOR="#1f1a17">).&nbsp;</FONT> </FONT></P>     <P ALIGN="justify"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> LAS METALOPROTEASAS&nbsp; </FONT></B> </P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las metaloproteasas fueron inicialmente caracterizadas por su propiedad  de degradar la matriz extracelular, requiriendo el ion Zn<FONT COLOR="#1f1a17"><SUP>2+ </SUP>o Ca<SUP>2+</SUP> en su  sitio activo, siendo inhibidas por agentes quelantes de zinc y calcio.  Son secretadas en forma latente y requiere activaci&#243;n para llevar a cabo  su actividad proteol&#237;tica, siendo inhibidas por los inhibidores tejidos-espec&#237;ficos  de metaloproteasas (TIMPs). La familia de las MMPs est&#225; constituida por  al menos 20 endopeptidasas que comparten homolog&#237;a &#150;30-50%&#150; y est&#225;n constituidas  por tres dominios: a) el &#147;pre&#148;-dominio necesario para su desplazamiento  intracelular hasta la superficie celular, el cual es eliminado r&#225;pidamente  despu&#233;s de la secreci&#243;n, y est&#225; ausente de la forma enzim&#225;tica madura;  b) el &#147;pro&#148;-dominio, que mantiene la actividad enzim&#225;tica bajo forma latente,  y est&#225; constituido de una secuencia pept&#237;dica que comprende un residuo  de cisteina que interact&#250;a con el sitio catal&#237;tico y finalmente, c) el  dominio catal&#237;tico propiamente dicho, que contiene un &#225;tomo de zinc sostenido  por tres residuos de histidina. Es necesario se&#241;alar que el residuo de  ciste&#237;na del &#147;pro&#148;-dominio act&#250;a como un cuarto ligando del ion met&#225;lico,  donde el clivaje proteol&#237;tico libera el &#225;tomo de zinc del residuo de ciste&#237;na  provocando la activaci&#243;n del sitio catal&#237;tico que ahora se puede unir a  su sustrato por la penetraci&#243;n de una mol&#233;cula de H<SUB>2</SUB>O. Tambi&#233;n debemos  considerar que la mayor parte de las metaloproteasas posee un cuarto dominio  en la posici&#243;n carboxilo terminal. Esta cadena polipept&#237;dica es homologo  de la vitronectina o de la hemopexina que intervienen en el reconocimiento  de los sustratos de la metaloproteasas.&nbsp;</FONT> </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> De acuerdo a sus diferencias estructurales las metaloproteasas pueden ser  clasificadas en seis grupos.&nbsp; </FONT></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 1. Matrilisinas</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las metaloproteasas matrilisina-1 (MMP-7) y matrilisina-2 (MMP-26) son  estructuralmente las m&#225;s simples, ya que no contienen dominio hom&#243;logo  de la hemopexina, y son expresadas espec&#237;ficamente por c&#233;lulas tumorales  de origen epitelial, cuyos espectros proteol&#237;ticos son divergentes, pero  incluyen la fibronectina y la gelatina (19, 20).&nbsp; </FONT></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 2. Colagenasas intersticiales</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> MMP-1, MMP-8, MMP-13 forman un segundo grupo de metaloproteasas que intervienen  en la degradaci&#243;n del col&#225;geno fibrilar que incluye los col&#225;genos tipo  I, II, III y VII. El clivaje proteol&#237;tico de estos col&#225;genos conduce a  la formaci&#243;n de col&#225;genos desnaturalizados o gelatinas, que a su vez es  degradado por las gelatinasas </FONT><font face="Verdana" size="2"> (21). La MMP-13 o colagenasa 13 es caracterizada  por un espectro enzim&#225;tico m&#225;s amplio, y es esencialmente expresado en  zonas donde se requiera remodelaci&#243;n r&#225;pida de la matriz extracelular,  tal como el tejido &#243;seo fetal en desarrollo o en lugares de inflamaci&#243;n  cr&#243;nica. Algunos carcinomas y sarcomas est&#225;n asociados a una hiperactividad  de la MMP-13 (22).&nbsp;</font></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 3. Estromalisinas</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estas metaloproteasas comprenden la MMP-3 o estromalisina-1, la MMP-10  o estromalisina-2, y la MMP-11 o estromalisina-3. En relaci&#243;n a estas proteasas  hay que se&#241;alar que los estudios con c&#233;lulas transformadas por oncogenes,  l&#237;neas celulares tumorales y modelos de tumores experimentales, se&#241;alan  que las c&#233;lulas cancerosas son responsables de la producci&#243;n de metaloproteasas  en los tumores humanos. Sin embargo, en estudios llevado a cabo en canceres  de mama humanos se ha reportado que los fibroblastos del estroma que rodeaban  a las c&#233;lulas tumorales, no las c&#233;lulas tumorales mismas, son responsables  en producir las estromalisinas </FONT><font face="Verdana" size="2"> (23). Una posible explicaci&#243;n de la producci&#243;n  de MMPs por las c&#233;lulas estromales del tumor fue el hallazgo de un inductor  de metaloproteasas de la matriz extracelular o EMMPRIN (Extracellular Matrix  Metaloproteinase Inducer) tambi&#233;n llamado basigina o DDT/37 (24). El EMMPRIN  es una glicoprote&#237;na de la membrana plasm&#225;tica que es producida en grandes  cantidades por las c&#233;lulas tumorales, provocando la estimulaci&#243;n local  de los fibroblastos a sintetizar MMP-1, MMP-2 y MMP-3. La interacci&#243;n de  las c&#233;lulas tumorales con los fibroblastos v&#237;a EMMPRIN, conduce a la degradaci&#243;n  local de la membrana basal y componentes de la matriz extracelular, facilitando  as&#237; la invasi&#243;n por parte de las c&#233;lulas tumorales, por lo que, de manera  indirecta las c&#233;lulas malignas facilitan su propia diseminaci&#243;n (25, 26). El EMMPRIN adem&#225;s, de inducir la producci&#243;n de metaloproteasas tambi&#233;n  induce la angiogenesis v&#237;a estimulaci&#243;n del VEGF, as&#237; como resistencia  multidroga mediante la sobreexpresi&#243;n de ErbB2 (27).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 4. Gelatinasas</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La actividad proteol&#237;tica de las MMP-2 y MMP-9 est&#225; dirigida contra el  col&#225;geno intersticial desnaturalizado o gelatina, col&#225;geno tipo IV y V  de la membrana basal </FONT><font face="Verdana" size="2"> (28). Una caracter&#237;stica estructural de las gelatinasas  es la presencia en el seno de su dominio catal&#237;tico de tres secuencias  peptidicas repetitivas an&#225;logos a los motivos de la fibronectina de tipo  II (29). La MMP-2 o gelatinasa-A es fisiol&#243;gicamente expresada por las  c&#233;lulas del estroma de la mayor&#237;a de los tejidos, pero la expresi&#243;n de  la MMP-9 o gelatinasa-B es d&#233;bil o ausente en los tejidos normales, y se  encuentra limitada a monocitos y macr&#243;fagos. Sin embargo, su expresi&#243;n  puede ser inducida en caso de remodelaci&#243;n tisular como el desarrollo embrionario,  cicatrizaci&#243;n o invasi&#243;n tumoral (30, 31).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 5. Metaloproteasas asociadas a membrana</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las MMP-14, MMP-15, MMP-16, MMP-17, MMP-24, MMP-25 tambi&#233;n denominadas  MT1-MMP a MT6-MMP, presentan la caracter&#237;stica esencial de poderse unir  a la membrana celular, bien sea por intermedio de un sitio hidr&#243;fobo de  la membrana independiente del dominio hemopexina o por la v&#237;a del GPI o  glicosilfosfatidilinositol </FONT><font face="Verdana" size="2"> (32). Es importante se&#241;alar que estas enzimas  intervienen en la activaci&#243;n proteol&#237;tica de otras metaloproteasas (33).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 6. Grupo heterog&#233;neo de metaloproteasas</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Una serie de metaloproteasas, las MMP-12, MMP-19, MMP-20, MMP-21, MMP-22,  MMP-23/B, MMP-28, ha sido identificada sin que, hasta el momento se tenga  claro el papel que desempe&#241;an en el desarrollo del c&#225;ncer </FONT><font face="Verdana" size="2"> (34, 35). La  MMP-12 cuyo sustrato principal es la elastina es secretada por los macr&#243;fagos,  mientras que la MMP-20 o enamelisina, interviene en la formaci&#243;n del esmalte  dentario (36, 37).&nbsp;</font></P>     <P ALIGN="justify"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> REGULACI&#211;N DE LA ACTIVIDAD DE LAS METALOPROTEASAS&nbsp; </FONT></B> </P>     <P ALIGN="justify"><font face="Verdana" size="2"> La actividad de las metaloproteasas en el espacio extracelular depende  del equilibrio que se establece entre su activaci&#243;n e inhibici&#243;n, este  &#250;ltimo fen&#243;meno controlada por inhibidores end&#243;genos conocidos como TIMP  o Tissue Inhibitors of Matrix Metalloproteinases, siendo activos contra  la mayor&#237;a de las MMPs, y difieriendo entre ellos en cuanto a su solubilidad,  regulaci&#243;n y su interacci&#243;n espec&#237;fica con la proenzima (15). La expresi&#243;n  de las metaloproteasas est&#225; estrictamente controlada, siendo inducida por  factores de crecimiento EGF, PDGF, TGF-</font><font size="2" face="Symbol">a</font><font face="Verdana" size="2">, bFGF; citoquinas como IL-1 y  TNF-</font><font size="2" face="Symbol">a</font><font face="Verdana" size="2"> y varios oncogenes (38), existiendo otros factores, como el TGF-</font><font size="2" face="Symbol">a</font><font face="Verdana" size="2">  y la IL-4, que inhiben su expresi&#243;n. Como ejemplo de la relaci&#243;n de las  proteasas con la oncogenicidad, el gen de la ST-1 o estromalisina-1 est&#225;  inducido en fibroblastos por promotores tumorales como el TPA y factores  de crecimiento como el EGF o PDGF, adem&#225;s est&#225; reprimido por inhibidores  como el TGF-</font><font size="2" face="Symbol">b</font><font face="Verdana" size="2">, AMP c&#237;clico, &#225;cido retinoico y glucocorticoides. Tambi&#233;n  se ha observado que la expresi&#243;n activada de oncogenes como ras o v-mos  o la sobreexpresi&#243;n de c-fos, erbA inducen la expresi&#243;n del gen de la estromalisina-1  (39). Confirmando la importancia de esta proteasa, y el papel clave que  la destrucci&#243;n de la membrana basal de los epitelios tiene en el proceso  tumorig&#233;nico, se ha observado que en ratones transg&#233;nicos, que sobreexpresan  ST-1, muestran una alta incidencia de c&#225;ncer de mama (40). Por otra parte,  un mecanismo &#250;nico de regulaci&#243;n de la gelatinasa-A o MMP-2 fue descrito  a nivel de la superficie celular. La forma inactiva de esta MMP se puede  unir a la MMP transmembrana, MT1-MMP formando un complejo trimolecular  con TIMP-2 en la superficie de la c&#233;lula que permite a una segunda mol&#233;cula  de MT1-MMP de cortar el p&#233;ptido N-terminal de la pro-MMP-2, y de activar  as&#237; la proteasa. En este mecanismo de activaci&#243;n, TIMP-2 juega un papel  de activador, y no de inhibici&#243;n, al actuar como una mol&#233;cula adaptadora;  MT1-MMP juega un doble papel de mol&#233;cula receptora y activadora (41). Algunas  MMP pueden ser activadas en el interior de la c&#233;lula antes de su secreci&#243;n,  que es el caso de algunas MT-MMP, las cuales poseen una secuencia espec&#237;fica  RRKR en su pro-dominio, reconocido por las furinas, una familia de serin-proteasas.&nbsp;</font></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><font face="Verdana" size="2"> Los TIMP inhiben las MMPs formando un complejo reversible y de alta afinidad  (42), controlan la activaci&#243;n de varias MMPs y forman complejos con dichas  proenzimas. El TIMP-1 lo hace preferencialmente con proMMP-9 y TIMP-2 con  proMMP-2, jugando un papel fundamental en el mantenimiento del balance  entre la deposici&#243;n y la degradaci&#243;n de la matriz extracelular en una amplia  gama de procesos fisiol&#243;gicos, como la remodelaci&#243;n &#243;sea o el mantenimiento  del cuerpo l&#250;teo (43), siendo tambi&#233;n actores centrales en la fisiopatolog&#237;a  de diversas enfermedades tales como la artritis, c&#225;ncer, cirrosis, etc  (44, 45). Se ha observado que la administraci&#243;n sist&#233;mica de TIMP-1 reduce  la incidencia de erosi&#243;n articular en ratones artr&#237;ticos, adem&#225;s TIMP-1  y 2 presentan actividad antiangiog&#233;nica, lo cual abri&#243; un nuevo campo de  inter&#233;s sobre el papel que los TIMPs podr&#237;an jugar en varias enfermedades  que involucran la formaci&#243;n de nuevos vasos (46). Algunas proteasas, como  la plasmina, y mismas las MMP son capaces de eliminar el pro-p&#233;ptido y  activar las MMPs, por lo cual una MMP particular pueden activar un miembro  de otra clase como por ejemplo, la MMP-1 es activada por la plasmina o  estromalisina-1 (47).&nbsp;</font></P>     <P ALIGN="justify"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> PAPEL DE LAS METALOPROTEASAS EN LA PROGRESI&#211;N TUMORAL&nbsp; </FONT></B> </P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Inicialmente, la importancia de las metaloprotesas fue atribuida a su capacidad  de degradar prote&#237;nas de la matriz extracelular, favoreciendo as&#237; la invasi&#243;n  tumoral, pero actualmente se tiene claro que estas enzimas ejercen una  actividad proteol&#237;tica dirigida contra prote&#237;nas no pertenecientes a la  matriz extracelular, por lo que su papel en la progresi&#243;n tumoral ha sido  objeto de intensos estudios en los &#250;ltimos veinte a&#241;os. As&#237;, independientemente  de otras consideraciones, las metaloproteasas juegan un papel importante  en las diferentes etapas de la progresi&#243;n tumoral, como es considerado  a continuaci&#243;n.&nbsp; </FONT></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> a. Proliferaci&#243;n</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Una etapa la progresi&#243;n tumoral donde las metaloproteasas intervienen es  en la proliferaci&#243;n de las c&#233;lulas tumorales </FONT><font face="Verdana" size="2"> (48). Fen&#243;meno inicialmente  sospechado por la observaci&#243;n del efecto negativo de los inhibidores de  las metaloproteasas sobre el crecimiento tumoral (49). Los mecanismos para  este efecto son m&#250;ltiples y complejos e involucra los factores de crecimiento,  citocinas y sus receptores. Algunas metaloproteasas como las estromalisinas,  digieren prote&#237;nas extracelulares que secuestran factores de crecimientos  como es el caso de IGFBP-3 o insulin-like growth factor binding protein  3, que se une a IGF II o insulin-like growth factor II, tambi&#233;n del perlacan  que secuestra a su vez el bFGF o basic fibroblast growth factor (50, 51).&nbsp;</font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Por otra parte, hay metaloproteasas que inducen un aumento de la actividad  biol&#243;gica de citocinas y de factores de crecimiento como fue demostrado  para el caso de la interleukina-8, en la cual su actividad aument&#243; en un  valor de 10 veces despu&#233;s de la digesti&#243;n por la MMP-9 </FONT><font face="Verdana" size="2"> (52, 53). Algunas  metaloproteasas tienen efecto antiproliferativo por su capacidad de solubilisar  receptores de membrana de citocinas, y por lo tanto, disminuir su efecto  biol&#243;gico (54); ellas tambi&#233;n act&#250;an sobre la proliferaci&#243;n de las c&#233;lulas  tumorales por las modificaciones estructurales que inducen en las prote&#237;nas  de la matriz extracelular, como la degradaci&#243;n del col&#225;geno fibrilar que  permiten, a c&#233;lulas del melanoma, activar la integrina </font><font size="2" face="Symbol">a</font><font face="Verdana" size="2">2</font><font size="2" face="Symbol">b</font><font face="Verdana" size="2">1, disminuir  la expresi&#243;n de la prote&#237;na p27 para estimular, de esta manera, la proliferaci&#243;n  celular (55). La interacci&#243;n de c&#233;lulas del melanoma a trav&#233;s del ligando  para </font><font size="2" face="Symbol">a</font><font face="Verdana" size="2">v</font><font size="2" face="Symbol">b</font><font face="Verdana" size="2"><sub>3</sub> con col&#225;geno desnaturalizado causa un incremento de la relaci&#243;n  Bcl-2:Bax protegiendo a estas c&#233;lulas de la apoptosis, aumentando as&#237; su  sobrevivencia (56). La estromalisina-3 o MMP-11 incrementa la tumorig&#233;nesis  a trav&#233;s de un decrecimiento de la apoptosis o necrosis por un mecanismo  todav&#237;a no precisado (57).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> b. P&#233;rdida de adhesividad</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Metaloproteasas tales como MMP-3 y MMP-7 est&#225;n implicadas en la p&#233;rdida  de la adhesividad celular, y la modificaci&#243;n fenot&#237;pica de las c&#233;lulas  epiteliales que se originan durante los primeros estad&#237;os del desarrollo  de un tumor </FONT><font size="2" face="Verdana"> (58). Estas enzimas presentan la caracter&#237;stica de digerir  la cadherina E con la subsecuente ruptura de las adherencias intercelulares  de los epitelios, adem&#225;s de estimular la expresi&#243;n de genes promotores  del c&#225;ncer, favoreciendo la activaci&#243;n de la </font><font size="2" face="Symbol">b</font><font size="2" face="Verdana">-catenina a partir de la  cadherina hacia el n&#250;cleo celular (59, 60).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> c. Invasi&#243;n</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La invasi&#243;n local es otra etapa de la progresi&#243;n tumoral en la cual intervienen  las proteasas </FONT><font size="2" face="Verdana"> (61). En particular, MMP-2 y MMP-9 presentan actividad proteol&#237;ticas  contra prote&#237;nas de la membrana basal tales como col&#225;geno tipo IV y V (62,  63), las MMP-1 y la MT1-MMP contra el col&#225;geno intersticial tipo I, II  o III presente en el tejido conjuntivo que rodea las c&#233;lulas tumorales  invasivas (33). El papel que desempe&#241;an las metaloproteasas en la invasi&#243;n  tumoral ha sido bien estudiado, habi&#233;ndose demostrado que las presentes  a nivel del frente invasivo no son producidas por las c&#233;lulas tumorales  mismas, sino por las c&#233;lulas estromales tales como fibroblastos, c&#233;lulas  endoteliales, macr&#243;fagos estimuladas por las c&#233;lulas tumorales (31, 64).  Por otra parte, se han identificado en c&#233;lulas malignas estructuras especializadas  constituidas por una red de microfilamentos que se ha denominado invadopodias  o podosomas, las cuales utilizan proteasas para degradar una variedad de  sustratos que incluye fibronectina, laminina, col&#225;geno y otros componentes  de la matriz extracelular. Tambi&#233;n se han identificado otras enzimas de  membrana de diferentes clases como componentes esenciales de estos elementos  (65), y que incluyen serin-proteasas, seprase, dipeptil peptidasa IV as&#237;  como tambi&#233;n MT-MMP (66). La membrana plasm&#225;tica de los invadopodias vierte  el contenido de ves&#237;culas que contienen MMP-9 y MMP-2 en la proteolisis  direccional de la matrix extracelular durante la migraci&#243;n, especialmente  durante la invasi&#243;n por parte de las c&#233;lulas cancerosas (67, 68).&nbsp;</font></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> d. Angiog&#233;nesis</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Numerosos estudios experimentales demuestran que la formaci&#243;n de nuevos  vasos sangu&#237;neos es un requerimiento vital para el crecimiento de un tumor  maligno, demostr&#225;ndose una correlaci&#243;n entre el incremento del n&#250;mero de  vasos sangu&#237;neos y la prognosis del tumor </FONT><font size="2" face="Verdana"> (69). Se han identificado y caracterizados  reguladores positivos de la angiog&#233;nesis, incluyendo factores de crecimiento  tales como VEGF, alfa FGF, beta FGF, EGF, TGF-alfa, TGF-beta, TNF-alfa,  angiopoetina, angionina, interleuquina-8. Tambi&#233;n se han identificado receptores  para factores angiog&#233;nicos, as&#237; como se&#241;ales de traducci&#243;n implicados en  la angiog&#233;nesis (70-72). Es un proceso complejo que requiere: 1.- degradaci&#243;n  de la membrana basal y matriz extracelular que rodea vasos sangu&#237;neos;  2.- la quimiotaxis de las c&#233;lulas endoteliales como respuesta a un estimulo  angiog&#233;nico; 3.- la proliferaci&#243;n de las c&#233;lulas endoteliales; 4- la remodelaci&#243;n  de la membrana basal del vaso sangu&#237;neo neoformado. Esta remodelaci&#243;n se  puede llevar a cabo como resultado de la actividad de las metaloproteasas,  las cuales son producidas por las c&#233;lulas endoteliales que secretan MMP-1,  MMP-2, MMP-3 y MT-MMP (73). El papel que desempe&#241;an MMP-2 y MT-MMP ha sido  mejor estudiado, y representan un papel crucial en este fen&#243;meno. Tratamiento  de c&#233;lulas endoteliales del cord&#243;n umbilical humano con ester de forbol  (TPA) provoca una activaci&#243;n de MMP-2 e inducci&#243;n de MT-MMP con la correspondiente  formaci&#243;n de una estructura tubular multicelular cuando fueron cultivadas  en una matriz de col&#225;geno (74). Un inhibidor de las metaloproteasas, el  marimastato o BB2516 impide la formaci&#243;n tubular y bloquea la activaci&#243;n  de MMP-2 (75). Las metaloproteasas tambi&#233;n participan en ayudar a las c&#233;lulas  endoteliales a invadir y revascularizar tejidos ricos en fibrina tanto  in vivo como in vitro. Esta capacidad de invadir fue independiente del  activador del plasmin&#243;geno y MT1-MMP representa la principal de las metaloproteasas  en causar este efecto, ya que en su ausencia no hay actividad fibrinolitica;  adem&#225;s las c&#233;lulas fueron incapaces de invadir el tejido rico en fibrina  (76, 77). Las integrinas, que comprende un grupo de mol&#233;culas de adhesi&#243;n  de superficie que se unen a componentes de la matriz extracelular (78),  donde, por ejemplo, la integrina </font><font size="2" face="Symbol">a</font><font size="2" face="Verdana"><sub>v</sub></font><font size="2" face="Symbol">b</font><font size="2" face="Verdana"><sub>3</sub> se une directamente a MMP-2 a trav&#233;s  del dominio hemopexin MMP-2 (79). La angiog&#233;nesis depende de eventos de  adhesi&#243;n mediados por la integrina </font><font size="2" face="Symbol">a</font><font size="2" face="Verdana"><sub>v</sub></font><font size="2" face="Symbol">b</font><font size="2" face="Verdana"><sub>3</sub>; un fragmento de MMP-2 que comprende  el dominio c-terminal (PEX) impide la uni&#243;n de MMP-2 a </font><font size="2" face="Symbol">a</font><font size="2" face="Verdana"><sub>v</sub></font><font size="2" face="Symbol">b</font><font size="2" face="Verdana"><sub>3</sub>. por lo que  el fragmento de PEX puede interrumpir la angiog&#233;nesis y el crecimiento  tumoral. Por ello se ha propuesto como estrategia terap&#233;utica, el empleo  de PEX como inhibidor de la angiog&#233;nesis (80).&nbsp;</font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La trombospondina que es una glicoprote&#237;na que act&#250;a como promotor de la  angiog&#233;nesis v&#237;a regulaci&#243;n de MMP-9 promueve a c&#233;lulas endoteliales bovinas  a formar t&#250;bulos </FONT><font size="2" face="Verdana"> (81, 82).</font><FONT COLOR="#1f1a17" size="2" face="Verdana">  Las proteasas intervienen en esta etapa de la  progresi&#243;n tumoral, donde ellas pueden tener un papel bien sea de estimulaci&#243;n  o inhibici&#243;n, haciendo &#233;nfasis tambi&#233;n en que algunas metaloproteasas son  expresadas por las c&#233;lulas endoteliales que responden a un estimulo angiog&#233;nico.  Estas enzimas juegan un papel importante en la degradaci&#243;n de la matriz  extracelular que acompa&#241;a la invasi&#243;n del tejido tumoral a trav&#233;s de vasos  sangu&#237;neos.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Por otra parte, las metaloproteasas pueden causar un efecto inhibitorio  en la angiog&#233;nesis produciendo factores antiangiog&#233;nicos a partir de mol&#233;culas  precursoras como es el caso de la angioestatina o endoestatina, producidas  en el &#225;rea peritumoral por las metaloproteasas &#150;2,-7,-9 y &#150;12 a partir  de precursores tales como el plasmin&#243;geno y col&#225;geno XVIII </FONT><font size="2" face="Verdana"> (77, 83, 84).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> e. Intravasi&#243;n, extravasi&#243;n y crecimiento&nbsp;de los tumores metast&#225;ticos</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las metaloproteasas son activas en los procesos de intravasi&#243;n, efecto  posible por la capacidad que tienen de destruir la membrana basal que rodea  el vaso sangu&#237;neo </FONT><font size="2" face="Verdana"> (85). Inhibidores de las metaloproteasas reducen la formaci&#243;n  de met&#225;stasis a partir de un tumor primario o la invasi&#243;n de una membrana  basal reconstituida <i> in vitro</i> (72, 86). Por otra parte, el papel desempe&#241;ado  en la extravasi&#243;n es menos evidente, pero sin embargo, se ha demostrado  que inhibidores de las metaloproteasas son incapaces de inhibir la colonizaci&#243;n  de los pulmones por c&#233;lulas tumorales inyectadas en la circulaci&#243;n venosa  (87, 88).</font><FONT COLOR="#1f1a17" size="2" face="Verdana">  Las metaloproteasas tambi&#233;n podr&#237;an intervenir en el crecimiento  de los tumores metast&#225;sicos, efecto complejo, ya que, implica una participaci&#243;n  activa sobre la angiog&#233;nesis y la proliferaci&#243;n celular.&nbsp; </FONT></P>     <P ALIGN="justify"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> INHIBIDORES TERAP&#201;UTICOS DE LAS METALOPROTEASAS: ENSAYOS PRECL&#205;NICOS Y CL&#205;NICO&nbsp; </FONT></B> </P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El papel de las metaloproteasas en la progresi&#243;n tumoral representa un  blanco terap&#233;utico importante, principalmente si consideramos que en numerosos  tumores ellas son producidas por las c&#233;lulas del estroma, m&#225;s que por las  c&#233;lulas tumorales, lo que sugiere que la inhibici&#243;n de las metaloproteasas  podr&#237;an escapar a los mecanismos de resistencia que desarrollan las c&#233;lulas  cancerosas ante los agentes quimioter&#225;picos debido a la inestabilidad gen&#233;tica </FONT><font size="2" face="Verdana">  (89-91). Por ello diferentes estrategias han sido desarrolladas para interferir  tanto con la expresi&#243;n como la activaci&#243;n de las metaloproteasas, donde  la metodolog&#237;a principal reside en la utilizaci&#243;n de inhibidores sint&#233;ticos  que interact&#250;an directamente con el sitio catal&#237;tico de las metaloproteasas,  bloqueando de manera reversible su actividad proteol&#237;tica (42).</font><FONT COLOR="#1f1a17" size="2" face="Verdana">  Se han  sintetizado gran cantidad de mol&#233;culas que poseen una alta afinidad por  estas enzimas, clasific&#225;ndose en dos categor&#237;as.&nbsp; </FONT></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 1. Inhibidores pseudopept&#237;dicos</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estos compuestos presentan una estructura que mimetizan el sitio de clivage  del sustrato, y presentan la particularidad de entrar en competencia con  el sustrato de las metaloproteasas, uni&#233;ndose al sitio catal&#237;tico por quelantes  del &#225;tomo de Zn, y que actualmente son utilizados en el tratamiento de  una amplia variedad de tumores </FONT><font size="2" face="Verdana"> (92). La mayor&#237;a de los inhibidores estudiados  tanto <i>in vitro</i> como <i> in vivo</i> de esta categor&#237;a son derivados de hidroxamatos,  siendo los m&#225;s conocidos el Batimastato o BB94 y Marimastato o BB2516,  los cuales presentan un amplio espectro de acci&#243;n (93).</font><FONT COLOR="#1f1a17" size="2" face="Verdana">  El segundo presenta  una mejor biodisponibilidad oral que el primero, que fue el primer inhibidor  de metaloproteasas que se experimento cl&#237;nicamente, y que en la fase I  present&#243; toxicidad. Los principales efectos secundarios reportados fueron  dolores m&#250;sculo-articulares de tipo inflamatorio, los cuales desaparecen  al suspender el tratamiento.&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estudios combinando el marimastato con drogas citot&#243;xicas como el temozolomida,  mostraron un efecto sinerg&#237;stico, el cual mejor&#243; el cuadro cl&#237;nico de pacientes  con glioblastoma multiforme </FONT><font size="2" face="Verdana"> (94). Pacientes con c&#225;ncer avanzado de pulm&#243;n  en fase I fueron tratados con la combinaci&#243;n de marimastato, carboplatino,  paclitaxel a las dosis de 10 mg, 7 mg/m<sup>2</sup>, 175 mg/m<sup>2</sup> respectivamente; los  pacientes toleraron las dosis suministradas, pero solamente presentaron  una respuesta parcial (95).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 2. Inhibidores no-pept&#237;dicos</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La limitada biodisponibilidad oral de los inhibidores pseudopept&#237;dicos,  a excepci&#243;n del marimastato, m&#225;s la falta de selectividad, han conducido  a la s&#237;ntesis de inhibidores no-pept&#237;dicos. La estructura de estos compuestos  se fundament&#243; sobre el an&#225;lisis tridimensional del sitio catal&#237;tico por  radio-cristalograf&#237;a, y el modo de acci&#243;n inhibitorio es similar al de  los agentes pseudo-pept&#237;dico, pero con una mayor especificidad por el tipo  de metaloproteasa a inhibir. Su espectro de acci&#243;n es m&#225;s selectivo, con  una d&#233;bil actividad frente a la metaloproteasa-1, pero con una fuerte actividad  para la metaloproteasa-2 y 9.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Entre las principales mol&#233;culas de esta categor&#237;a tenemos el prinomastato  que es un inhibidor selectivo para las metaloproteasas 2, 3, 9,13 y 14,  el cual fue evaluado cl&#237;nicamente, por su capacidad de inhibir la met&#225;stasis  en pacientes con diferentes tipos de tumores s&#243;lidos. A dosis toleradas  y con bajos niveles de citotoxicidad, se observ&#243; una buena respuesta durante  los tres meses de tratamiento </FONT><font size="2" face="Verdana"> (96). En el modelo ortot&#243;pico de c&#225;ncer de  pulm&#243;n NCI-H460, que exhibe alto patr&#243;n metast&#225;sico y que expresa MMP-2,  MT1-MMP (MMP-14), se estudi&#243; la actividad antitumoral del prinomastato  como simple agente o en combinaci&#243;n con el carboplatino a bajas dosis;  en ambos casos se observ&#243; un incremento en la supervivencia de ratones  portadores de este tumor (97). Combinando el prinomastato con gemcitabine  y cisplatino a las dosis de 15 mg, 1.250 mg/m<sup>2</sup>, 75 mg/m<sup>2</sup> respectivamente,  se realiz&#243; un estudio en pacientes con c&#225;ncer de pulm&#243;n en fase III. Los  resultados no mostraron mejor&#237;a, as&#237; como tampoco un aumento en la sobrevivencia  (98).&nbsp;</font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El BMS-275291 es otro nuevo inhibidor de las metaloproteasas, el cual se  ensay&#243; a dosis l&#237;mite de 1200 mg/d&#237;a en pacientes en avanzado c&#225;ncer metast&#225;tico  colorectal y pulm&#243;n en fase II, observ&#225;ndose un incremento de la supervivencia,  y hall&#225;ndose tambi&#233;n que a dosis superiores el valor ya se&#241;alado provoc&#243;  una alta citotoxicidad </FONT><font face="Verdana" size="2"> (99). Tratamientos combinando BMS-275291 con paclitaxel  y carboplatino fueron bien tolerados en pacientes con c&#225;ncer de pulm&#243;n  en fase II (100). Esta misma combinaci&#243;n terap&#233;utica fue suministrada a  pacientes con avanzado c&#225;ncer de pulm&#243;n fase III, observ&#225;ndose que no mejora  la sobrevivencia de los pacientes, sumado a una alta citotoxicidad (101).  Un inhibidor oral de las metaloproteasas, el MMI270 (CGS27023A) redujo  el crecimiento del tumor y la met&#225;stasis en ensayos precl&#237;nicos, pero provoca  efectos t&#243;xicos que son reversibles una vez que se detiene el tratamiento.  Combinando el MMI270 con fluoruracilo y &#225;cido fol&#237;nico, se realiz&#243; un estudi&#243;  en pacientes con c&#225;ncer colorectal avanzado utilizandose dosis de 500mg  de fluoruracilo, 200mg de &#225;cido fol&#237;nico y 300 mg de MMI270; los pacientes  toleraron el tratamiento sin efectos citot&#243;xicos evidentes y con un aumento  de sobrevivencia (102).&nbsp;</font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El BAY 12-9566 es otro inhibidor no pept&#237;dico que inhibe la angiog&#233;nesis  y la met&#225;stasis, observ&#225;ndose experimentalmente efectos secundarios tales  como elevaciones asintom&#225;ticas de las enzimas hep&#225;ticas, as&#237; como de trombocitopenia  Sin embargo, en el modelo ortot&#243;pico MDA-MB-435 de un carcinoma mamario  humano transplantado en rat&#243;n, el BAY 12-9566 administrado diariamente  a una dosis l&#237;mite de 100mg/kg /d&#237;a inhibi&#243; en crecimiento del tumor as&#237;  como la met&#225;stasis sin producir efectos citot&#243;xicos secundarios. Este inhibidor  no ha sido, hasta el presente utilizado en cl&#237;nica, pero sin embargo, se  presenta como una alternativa para ser utilizado en el tratamiento de c&#225;ncer  de mama adyuvante a la cirug&#237;a </FONT><font size="2" face="Verdana"> (103). Por otra parte, han sido suspendidos  los ensayos cl&#237;nicos con BAY 12-9566 debido a su alta toxicidad profundiz&#225;ndose  las investigaciones en modelos precl&#237;nicos (104).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 2a. Derivados de la tetraciclina</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estos compuestos inhiben las colagenasas y gelatinasas y comprenden los  antibi&#243;ticos cl&#225;sicos tales como la tetraciclina, deoxiciclina, minociclina,  y tambi&#233;n nuevos compuestos an&#225;logos, tal como el Metastato (col-3) que  es una tetraciclina modificada para eliminar la actividad antimicrobiana  y la toxicidad gastrointestinal </FONT><font face="Verdana" size="2"> (105, 106). Entre los efectos secundarios  de este inhibidor tenemos foto toxicidad cut&#225;nea, anemia, nauseas, elevaci&#243;n  de enzimas hep&#225;ticas, fiebre y neurotoxicidad. Estos derivados bloquean  las actividades de las metaloproteasas por acci&#243;n de agentes quelantes  del &#225;tomo de Zn del sitio catal&#237;tico, interfiriendo con la activaci&#243;n proteol&#237;tica  de las proenzimas, reduciendo a su vez la expresi&#243;n de las metaloproteasas  y disminuyendo su degradaci&#243;n (42, 107). Ensayos cl&#237;nicos con pacientes  presentando variados tumores s&#243;lidos recibieron col-3 a dosis l&#237;mite de  50 mg/m<sup>2</sup>/d&#237;a experimentando una estabilizaci&#243;n de la enfermedad con pocos  efectos secundarios (108).&nbsp;</font></P>     <P ALIGN="justify"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> 2b. Bifosfonatos</FONT></B><FONT COLOR="#1f1a17" size="2">&nbsp;</FONT></font></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Son mol&#233;culas capaces de inhibir las metaloproteasas, inicialmente utilizados  en las alteraciones del equilibrio del calcio, y m&#225;s tarde en el tratamiento  paliativo de las met&#225;stasis &#243;seas </FONT><font size="2" face="Verdana"> (109, 110). Estas mol&#233;culas act&#250;an disminuyendo  la actividad proteol&#237;tica y reduciendo la secreci&#243;n de MMP-2 y MT1-MMP  (MMP-14) El clodronato, un bifosfonato, inhibe la actividad de MM1-MMP,  reduciendo la capacidad invasiva y metast&#225;sica de las c&#233;lulas del osteosarcoma  MG-63 (111, 112). Los estudios terap&#233;uticos utilizando estos inhibidores  han sido realizados en pacientes que presentan c&#225;ncer en estado avanzado,  y las experiencias hechas con modelos animales han mostrado claramente  que la inhibici&#243;n de las metaloproteasas es m&#225;s eficaz en las etapas precoces  de la progresi&#243;n tumoral. En pacientes con c&#225;ncer avanzado, los principales  blancos para las metaloproteasas, como son la invasi&#243;n tumoral, angiog&#233;nesis  y la diseminaci&#243;n metast&#225;sica, los resultados esperados no se han producido,  por lo que el efecto de estos inhibidores son insignificantes a este nivel.  Por tanto, ahora que no se ha podido obtener un claro efecto ben&#233;fico del  papel de los inhibidores de las metaloproteasas en el tratamiento antitumoral  de los pacientes con c&#225;ncer, hay necesidad de insistir dada la importancia  crucial de los mecanismos involucrados. Lo deseable ser&#237;a poder realizar  con seguridad, estudios cl&#237;nicos en pacientes con c&#225;ncer en estado precoz  o en remisi&#243;n, con el fin de lograr un tratamiento preventivo de la diseminaci&#243;n  metast&#225;sica (113, 114). </font><FONT COLOR="#1f1a17" size="2" face="Verdana">  Adicionalmente, como previamente se ha sugerido,  estos inhibidores podr&#237;an ser utilizados en la cl&#237;nica en combinaci&#243;n con  otros agentes antitumorales. Para lo cual, se requiere la disponibilidad  de marcadores biol&#243;gicos capaces de identificar, precozmente y espec&#237;ficamente  la actividad de los inhibidores de las metaloproteasas, lo cual permitir&#237;a  hacer la evaluaci&#243;n exhaustiva de estos estudios.&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La concentraci&#243;n plasm&#225;tica de VEGF y bFGF o la excreci&#243;n urinaria de la  degradaci&#243;n del col&#225;geno han sido monitoreadas en pacientes tratados con  marimastato y prinomastato </FONT><font size="2" face="Verdana"> (115), sin embargo estos estudios no han sido  concluyentes. Bremer ha desarrollado un m&#233;todo de imagen &#243;ptica para monitorear  selectivamente el nivel de expresi&#243;n espec&#237;fica de la metaloproteasa-2  (MMP-2) <i>in vivo</i>, t&#233;cnica que podr&#237;a detectar <i>in vivo</i> tumores que posean  una gran actividad proteol&#237;tica, y hacer un seguimiento de la eficacia  de inhibidores sint&#233;ticos sobre los tumores (116).&nbsp;</font></P>     <P ALIGN="justify"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> PERSPECTIVAS DE FUTURO&nbsp; </FONT></B> </P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La participaci&#243;n activa de las metaloproteasas en las diferentes etapas  de la progresi&#243;n tumoral se apoyan sobre las diferentes observaciones cl&#237;nicas  de la expresi&#243;n de estas enzimas en diferentes tipos de canceres metast&#225;sicos  humanos, as&#237; como tambi&#233;n sobre las prote&#237;nas de la matriz que son modificadas  por ellas, y su influencia tanto en el crecimiento como en la invasi&#243;n  tumoral, lo que ha tra&#237;do como consecuencia el desarrollo de inhibidores  sint&#233;ticos de las metaloproteasas.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estudios pre-cl&#237;nicos realizados en modelos animales utilizando estos inhibidores  han demostrado inhibici&#243;n de las metaloproteasas en los tumores con resultados  alentadores, por lo cual es necesario hacer mayores estudios e insistir  en la posibilidad de su utilizaci&#243;n en el tratamiento de pacientes con  c&#225;ncer, a pesar de que los primeros ensayos no han aportado un claro beneficio  terap&#233;utico. No obstante, el estudio de la aplicaci&#243;n de estos inhibidores  tanto en etapas precoces como avanzadas deben continuar desarroll&#225;ndose  para aprovechar el potencial inhibitorio de estas mol&#233;culas, siendo tambi&#233;n  muy importante el desarrollo de marcadores biol&#243;gicos que permitan el seguimiento  <I>in vivo</I> del efecto de estos inhibidores, as&#237; como el mecanismo de acci&#243;n  de estos compuestos.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Adicionalmente, es necesario identificar las se&#241;ales que son responsables  de la interacci&#243;n molecular entre las c&#233;lulas del estroma y las tumorales,  requisito necesario para evaluar los posibles blancos de las metaloproteasas  que son producidas por las c&#233;lulas del estroma. La estabilidad gen&#233;tica  de las c&#233;lulas del estroma, comparada a las de las c&#233;lulas tumorales, hacen  del sistema un blanco atractivo para los tratamientos quimioterap&#233;uticos,  por lo que, es necesario profundizar los estudios de los mecanismos moleculares  que aclaren en toda su dimensi&#243;n el papel que desempe&#241;an las metaloproteasas  en la fisiopatolog&#237;a del c&#225;ncer.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Largos a&#241;os de investigaci&#243;n han demostrado el papel fundamental que desempe&#241;an  las proteasas tanto en el desarrollo embrionario, reparaci&#243;n y remodelaci&#243;n  de tejidos, as&#237; como en los procesos de invasi&#243;n por parte de las c&#233;lulas  malignas que llevan a la infiltraci&#243;n y met&#225;stasis, propiedades que signan  la malignidad del c&#225;ncer. &#191;Por qu&#233; no insistir en controlarlas?&nbsp; </FONT></P>     <P ALIGN="justify"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> REFERENCIAS&nbsp; </FONT></B> </P>     <!-- ref --><P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> 1.&nbsp;<B>Geho DH, Bandle RW, Clair T, Liotta LA.</B> Physiological mechanism of tumor-cell  invasion and migration. 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Lung Cancer Suppl 2003; 1:  S81-S91.&nbsp;</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=1136725&pid=S0535-5133200600020000900115&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><P ALIGN="justify"><FONT COLOR="#1f1a17" size="2" face="Verdana"> 116.&nbsp;<B>Bremer C, Bredow S, Mahmood U, Weissleder R, Tung CH.</B> Optical imaging of  matrix metalloproteinase-2 activity in tumors: feasibility study in a mouse  model. Radiology 2001; 221:523-529.&nbsp;</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=1136726&pid=S0535-5133200600020000900116&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p ALIGN="justify"><font size="2" face="Verdana"><font COLOR="#1f1a17">Autor de correspondencia: Francisco Arvelo. Instituto de Biología Experimental, Facultad de Ciencias, Universidad Central de Venezuela. Calle Suapure, Colinas de Bello Monte, Caracas, Venezuela. Telfs: (0212)</font> <font COLOR="#1f1a17">751.09.44/751.07.66/751.03.77 Correo electrónico: franarvelo@yahoo.com</font></font></p>      ]]></body>
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