<?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>S0535-51332012000100008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Péptidos antimicrobianos: un probable arsenal contra la infección por VIH]]></article-title>
<article-title xml:lang="en"><![CDATA[Antimicrobial peptides: a potential arsenal against HIV infection]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castañeda-Delgado]]></surname>
<given-names><![CDATA[Julio Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cervantes-Villagrana]]></surname>
<given-names><![CDATA[Alberto Rafael]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rivas-Santiago]]></surname>
<given-names><![CDATA[Bruno]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,IMSS Unidad de Investigación Médica-Zacatecas ]]></institution>
<addr-line><![CDATA[Zacatecas ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2012</year>
</pub-date>
<volume>53</volume>
<numero>1</numero>
<fpage>71</fpage>
<lpage>83</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0535-51332012000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0535-51332012000100008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0535-51332012000100008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La infección por VIH (virus de la inmunodeficiencia humana) en la actualidad es un grave problema de salud pública a nivel mundial, que requiere de nuevas estrategias vacunales para detener su propagación así como para su efectivo tratamiento. Algunos estudios relacionados con la inmunidad innata en contra de VIH, han demostrado que los péptidos antimicrobianos (AMP´s) pueden generar resistencia a las infecciones virales. En la presente revisión, se describen a los péptidos antimicrobianos de humano y su actividad en contra de VIH así como péptidos de otras especies como plantas, anfibios, insectos y varias especies de animales que poseen un potencial terapéutico o profiláctico en la infección por VIH. Se describen brevemente algunos mecanismos mediante los cuales estos péptidos pueden bloquear la replicación e infección por el VIH.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[HIV (human immunodeficiency virus) infection is today a very important health issue worldwide, which demands new ways and strategies for its prevention and treatment. Several studies on the innate immunity against HIV infection have shown that antimicrobial peptides are associated with increased resistance to infection. In the present review, we briefly summarize the major characteristics of antimicrobial peptides from human and several species of plants, amphibians, insects and other animal species that have significant potential to be used as therapeutic or prophylactic agents. The mechanisms of infection inhibition and viral replication blockade are also described in the context of the biology of infection.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[VIH]]></kwd>
<kwd lng="es"><![CDATA[infección]]></kwd>
<kwd lng="es"><![CDATA[péptidos antimicrobianos]]></kwd>
<kwd lng="en"><![CDATA[HIV]]></kwd>
<kwd lng="en"><![CDATA[Infection]]></kwd>
<kwd lng="en"><![CDATA[Antimicrobial peptides]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <BASEFONT SIZE="3"> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="center"><FONT COLOR="#1f1a17" FACE="Verdana"> <B>P&#233;ptidos antimicrobianos: un probable arsenal contra la infecci&#243;n por VIH.</B></FONT></P> <font size="2" face="Verdana"></font>     <P ALIGN="center"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Julio Enrique Casta&#241;eda-Delgado<SUP>1,2</SUP>, Alberto Rafael Cervantes-Villagrana<SUP>1,2</SUP>  y  Bruno Rivas-Santiago<SUP>1</SUP></FONT></P>     <P ALIGN="justify"> <FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2"><SUP>1</SUP>Unidad de Investigaci&#243;n M&#233;dica-Zacatecas, IMSS, Zacatecas,&nbsp; <SUP>2</SUP>Departamento  de Inmunolog&#237;a, Facultad de Medicina, UASLP. San Luis Potos&#237;, M&#233;xico.</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Autor de correspondencia: Bruno Rivas-Santiago. Unidad de Investigaci&#243;n  M&#233;dica-Zacatecas, IMSS, Zacatecas, M&#233;xico. Correo electr&#243;nico: </FONT><A HREF="mailto:rondo_vm@yahoo.com"><font size="2" face="Verdana">rondo_vm@yahoo.com</font></A></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Resumen.</B> La infecci&#243;n por VIH (virus de la inmunodeficiencia humana) en  la actualidad es un grave problema de salud p&#250;blica a nivel mundial, que  requiere de nuevas estrategias vacunales para detener su propagaci&#243;n as&#237;  como para su efectivo tratamiento. Algunos estudios relacionados con la  inmunidad innata en contra de VIH, han demostrado que los p&#233;ptidos antimicrobianos  (AMP&#180;s) pueden generar resistencia a las infecciones virales. En la presente  revisi&#243;n, se describen a los p&#233;ptidos antimicrobianos de humano y su actividad  en contra de VIH as&#237; como p&#233;ptidos de otras especies como plantas, anfibios,  insectos y varias especies de animales que poseen un potencial terap&#233;utico  o profil&#225;ctico en la infecci&#243;n por VIH. Se describen brevemente algunos  mecanismos mediante los cuales estos p&#233;ptidos pueden bloquear la replicaci&#243;n  e infecci&#243;n por el VIH.</FONT></P> </MULTICOL>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Palabras clave:&nbsp;</B>VIH, infecci&#243;n, p&#233;ptidos antimicrobianos.&nbsp; </FONT></P> <MULTICOL GUTTER="31" COLS="2"> <font size="2" face="Verdana"></font>     <P ALIGN="center"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Antimicrobial peptides: a potential arsenal against HIV infection.</B></FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Abstract.</B> HIV (human immunodeficiency virus) infection is today a very  important health issue worldwide, which demands new ways and strategies  for its prevention and treatment. Several studies on the innate immunity  against HIV infection have shown that antimicrobial peptides are associated  with increased resistance to infection. In the present review, we briefly  summarize the major characteristics of antimicrobial peptides from human  and several species of plants, amphibians, insects and other animal species  that have significant potential to be used as therapeutic or prophylactic  agents. The mechanisms of infection inhibition and viral replication blockade  are also described in the context of the biology of infection.</FONT></P> </MULTICOL>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Keywords:&nbsp;</B>HIV, Infection, Antimicrobial peptides.</FONT></P> <MULTICOL GUTTER="31" COLS="2">     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Recibido: 08-09-2010 Aceptado: 27-10-2011</FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>INTRODUCCI&#211;N</B></FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> La organizaci&#243;n mundial de la salud estima que cerca de 33.2 millones de  personas viven actualmente infectadas por este virus, la mayor&#237;a de los  cuales se encuentran en regiones del &#225;frica subsahariana. Tan solo en 2009,  2.6 millones de personas contrajeron la infecci&#243;n (1). Aunque estas cifras  son alarmantes y motivo de gran preocupaci&#243;n, se ha calculado que el riesgo  de transmisi&#243;n por acto sexual sin protecci&#243;n es de orden de 3 a 50 por  cada 10.000 exposiciones sin protecci&#243;n, adem&#225;s que el riesgo de transmisi&#243;n  incrementa cuando el portador padece ulceraciones en genitales. Lo anterior  hace evidente que existen mecanismos de inmunidad innata en el humano que  limitan esta infecci&#243;n (2). Existe informaci&#243;n acerca del papel de diversos  mecanismos de inmunidad innata que juegan un importante rol en el control  de la infecci&#243;n, entre los que se destacan los p&#233;ptidos antimicrobianos.  Se ha descrito la participaci&#243;n de los AMP&#180;s en diversos modelos de infecci&#243;n  in vitro; adem&#225;s diversos datos de estudios cl&#237;nicos sugieren la importancia  de estas mol&#233;culas en la inmunidad a HIV. Esto sugiere que tales mol&#233;culas  pueden ser utilizadas como agentes profil&#225;cticos o como tratamiento una  vez que se encuentra establecida la enfermedad. La presente revisi&#243;n tiene  como objetivo analizar el papel que juegan los p&#233;ptidos antimicrobianos  en la infecci&#243;n por VIH y describir los principales mecanismos mediante  los cuales estos p&#233;ptidos limitan la infecci&#243;n.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>INFECCI&#211;N POR VIH Y P&#201;PTIDOS ANTIMICROBIANOS&nbsp;</B> </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> El proceso normal de infecci&#243;n en c&#233;lulas permisivas al VIH comienza cuando  una part&#237;cula viral es liberada de una c&#233;lula infectada. Cuando dicha part&#237;cula  interacciona con los receptores CXCR4, CCR5 y CD4 se da el proceso conocido  como adsorci&#243;n viral; despu&#233;s, por cambios conformacionales en las prote&#237;nas  GP120 y GP41 del virus, se lleva a cabo la fusi&#243;n y el desnudamiento del  mismo, para dar paso despu&#233;s a la transcripci&#243;n reversa, la que ayudar&#225;  a la integraci&#243;n del genoma viral en la c&#233;lula hu&#233;sped. El virus puede  permanecer inactivo durante d&#233;cadas en individuos conocidos como &#147;no progresores  a largo plazo&#148; (del ingl&#233;s &#147;Long term non-progressors&#148;). Una vez que se  inicia la transcripci&#243;n de los genes del virus y su traducci&#243;n para el  ensamblaje de nuevas part&#237;culas virales que son liberadas e infectan nuevas  c&#233;lulas o que pueden ser transferidas a otras c&#233;lulas e infectarlas por  contacto directo. Se han descrito algunos mecanismos de inmunidad innata  que son capaces de impedir la infecci&#243;n, entre los que destacan los mediados  por mol&#233;culas solubles como es el caso de los p&#233;ptidos antimicrobianos.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Los p&#233;ptidos antimicrobianos poseen secuencias de bajo peso molecular de  entre 30 y 100 amino&#225;cidos. Adoptan principalmente 2 tipos de estructuras  que condicionan los efectos antivirales: a-h&#233;lice y hoja b plegada (3).  En la naturaleza existen una amplia variedad de p&#233;ptidos antimicrobianos  que son producidos por especies de anfibios, insectos, plantas y mam&#237;feros  (4). Hoy existen m&#225;s de 1.500 p&#233;ptidos antimicrobianos reportados (<a href="http://aps.unmc.edu/AP/main.php">http://aps.unmc.edu/AP/main.php</a>)(5).&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Las primeras observaciones que suger&#237;an que los p&#233;ptidos antimicrobianos  inactivan algunos virus, fueron publicadas por Daher y col. en 1986. En  dicha publicaci&#243;n, los autores describen c&#243;mo la incubaci&#243;n de algunos  virus como HSV-1 o CMV con p&#233;ptidos antimicrobianos ocasiona inactivaci&#243;n  viral (6), al parecer mediante interacciones directas con el viri&#243;n. Posteriores  reportes mostraron que varios p&#233;ptidos antimicrobianos tanto de humano  como de muchas otras especies de plantas y animales ten&#237;an actividad contra  el virus del VIH. Estos ser&#225;n descritos en apartados posteriores.&nbsp; </FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>P&#201;PTIDOS ANTIMICROBIANOS DE HUMANO&nbsp;</B> </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Existen varias familias de p&#233;ptidos antimicrobianos en humano, entre las  principales se encuentran: Las defensinas, las catelicidinas y las histatinas.  Las defensinas son p&#233;ptidos antimicrobianos de 3-5 kD, que tienen dos subfamilias:  las </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> a</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensinas o HNP&#180;s (human neutrophil peptides, por sus siglas en  ingl&#233;s) y las </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> b</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defesinas. Fueron descubiertos por Ganz y col. a mediados  de los a&#241;os 80&#180;s (7). Existen 6 </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> a</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensinas, cuatro de las cuales se encuentran  en los gr&#225;nulos azur&#243;filos de neutr&#243;filos (HNP 1-4) y los HNP5 y 6 se producen  principalmente en las c&#233;lulas de Paneth (8-11).&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> En un reporte de Chang y col. se describe la posible participaci&#243;n de los  p&#233;ptidos HNP-1,2,3 y 4 (mostrando esta &#250;ltima mayor actividad (12) en la  inhibici&#243;n de la replicaci&#243;n viral. Aunque inicialmente se les asoci&#243; con  el CAF (Cellular antiviral factor, por sus siglas en ingl&#233;s (13, 14) este  grupo describi&#243; algunos detalles de este mecanismo de inhibici&#243;n de las </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> a</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensinas que est&#225; mediado por el bloqueo de la PKC (15) (prote&#237;na cinasa  C), enzima crucial en la replicaci&#243;n del VIH. Permanece en debate el tema  de la participaci&#243;n de las </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> a</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensinas en procesos fisiol&#243;gicos ya que,  como se ha descrito previamente, estos p&#233;ptidos antimicrobianos se encuentran  principalmente en los gr&#225;nulos azur&#243;filos de los neutr&#243;filos (16, 17),  lo que los imposibilita para tener una participaci&#243;n activa en el control  de la infecci&#243;n por VIH. Sin embargo, ha sido descrita la expresi&#243;n de  estos p&#233;ptidos en linfocitos T y en c&#233;lulas &#147;Natural Killer&#148;, aunque en  menores concentraciones que las de los neutr&#243;filos (18), lo que podr&#237;a  indicar la participaci&#243;n de estas c&#233;lulas en la infecci&#243;n por VIH, ya que  D&#146;angostino en 2009 describi&#243; un incremento en la expresi&#243;n y producci&#243;n  de estos AMP&#180;s en plasma, neutr&#243;filos y c&#233;lulas T CD8+ de pacientes infectados  con VIH, comparados con individuos sanos; aunque permanece en entredicho  el papel fisiol&#243;gico de las </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> a</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensinas en la infecci&#243;n por VIH (19).  Sin embargo, un reporte de 2007 de Rodr&#237;guez-Garc&#237;a demostr&#243; que, adem&#225;s  de los neutr&#243;filos, las c&#233;lulas dendr&#237;ticas inmaduras son capaces de producir </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> a</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensinas 1-3 (20) demostrando que existe una producci&#243;n incrementada  de alfa defensinas por parte de las c&#233;lulas dendr&#237;ticas en individuos infectados  por VIH y que este incremento se encuentra asociado con una disminuci&#243;n  en la progresi&#243;n de la infecci&#243;n (21).&nbsp; </FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Se ha descrito tambi&#233;n la participaci&#243;n de las  </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> b</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensinas en la inhibici&#243;n  de la replicaci&#243;n del VIH. Un reporte de Qui&#241;ones-Mat&#233;u y col. describe  la importancia de las </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> b</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensinas 2 y 3 en la inhibici&#243;n de la replicaci&#243;n  viral. Los autores sugieren que esta inhibici&#243;n parece estar mediada por  la disminuci&#243;n de la expresi&#243;n del receptor CXCR4 y por interacciones directas  con el viri&#243;n (22); en este reporte tambi&#233;n se descarta la actividad de  la </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> b</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensina 1, puesto que la prote&#237;na recombinante no muestra actividad  inhibitoria. Estos datos difieren de un reporte de Sun y col. en que se  describen la posible participaci&#243;n de HBD-1 en un mecanismo de inhibici&#243;n  mediado por la disrupci&#243;n de los rafts de membrana y la alteraci&#243;n del  proceso de internalizaci&#243;n viral (23), mecanismo que ya hab&#237;a sido descrito  para la </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> a</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-defensina 1 (15). Las principales diferencias de ambos reportes  son el uso de diferentes l&#237;neas celulares y el origen de los p&#233;ptidos,  ya que en el primero se trata de p&#233;ptidos recombinantes y el segundo, productos  de un sistema de traducci&#243;n in vitro que pudiese haber generado diferencias  en la formaci&#243;n de los puentes disulfuro intramoleculares y, en consecuencia,  generar diferencias en la actividad antimicrobiana; sin embargo, valdr&#237;a  la pena indagar estas diferencias.&nbsp; </FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> La lisozima purificada de muestras de mujeres embarazadas reduce la producci&#243;n  del VIH en cultivos de linfocitos T y monocitos infectados experimentalmente.  Para determinar el efecto antiviral cuantificaron la producci&#243;n de la prote&#237;na  viral P24, lo que hace suponer que el mecanismo de acci&#243;n esta mediado  por la desregulaci&#243;n de la expresi&#243;n de los genes del VIH. Aunque dicha  actividad es d&#233;bil, no ha sido confirmada en reportes independientes (24).&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> La lactoferrina es otro p&#233;ptido antimicrobiano que ha sido asociado con  protecci&#243;n en infecciones virales (25). El mecanismo de acci&#243;n de la lactoferrina  contra el VIH se relaciona a las fases tempranas de la infecci&#243;n, en particular  a la adsorci&#243;n del virus a la c&#233;lula hu&#233;sped. En ensayos in vitro se ha  demostrado que la lactoferrina humana se une al asa V3 de la gp120, tanto  de cepas VIH-1 y VIH-2. Estos datos han llevado a pensar que esta uni&#243;n  genera una d&#233;bil interacci&#243;n entre la gp120 y su receptor en la c&#233;lula  hu&#233;sped, impidiendo de esta manera la fusi&#243;n viral y la infecci&#243;n (26).  Existen algunos datos contradictorios en estas asociaciones, aunque en  pacientes sintom&#225;ticos con SIDA se observa un decremento en los niveles  de lactoferrina en diversos fluidos corporales, lo que pudiera explicar  de alguna manera la susceptibilidad a infecciones oportunistas (27-30).&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Las catelicidinas son p&#233;ptidos antimicrobianos que derivan de pre-pro p&#233;ptidos  conocidos como catelinas (31). Wang y col. describen la actividad antimicrobiana  de una gran variedad de p&#233;ptidos sint&#233;ticos derivados de la catelicidina  humana LL-37, cuya concentraci&#243;n inhibitoria es de 1.6 &#181;M. El mecanismo  de acci&#243;n de la catelicidina al parecer esta mediado por interacciones  con el viri&#243;n, inhibiendo as&#237; las etapas tempranas del ciclo de replicaci&#243;n  del virus (32). Existen otros reportes que resaltan la participaci&#243;n de  los p&#233;ptidos antimicrobianos de humano en la inhibici&#243;n de la replicaci&#243;n  viral, mismos que se resumen en la <a href="#TABLA_I">Tabla I</a>.</FONT></P> </MULTICOL>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B><a name="TABLA_I">TABLA I</a></B></FONT></P>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> LOCALIZACI&#211;N Y ACTIVIDAD CONTRA VIH DE AMP&#180;S DE HUMANO</FONT></P>     <div align="center"> <TABLE cellspacing="1" width="580" border="1" id="table1"> <TR> <TD WIDTH="99" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> P&#233;ptido&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Localizaci&#243;n&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Mecanismo de actividad antiviral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP" BGCOLOR="#c3c3c2">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Referencia&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">a</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2">-Defensina 1&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Neutr&#243;filos y c&#233;l. Dendriticas&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibici&#243;n de la transcripci&#243;n, transferencia y fusi&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (13,14,55)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">a</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2">-Defensina 2&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Neutr&#243;filos y C&#233;l. Dendr&#237;ticas&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibici&#243;n de la transcripci&#243;n, transferencia y fusi&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (13,14,55)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">a</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2">-Defensina 3&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Neutr&#243;filos y C&#233;l. Dendriticas&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibici&#243;n de la transcripci&#243;n, transferencia y fusi&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (13,14,55,56)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">a</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2">-Defensina 4&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Neutr&#243;filos&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibici&#243;n de la internalizaci&#243;n viral dos veces mayor que HNP 1,2,3&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (12)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">a</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2">-Defensina 5&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C&#233;l. Paneth&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> No tiene actividad contra VIH&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (57)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">b</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2">-Defensina 1&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Constitutiva en C&#233;l. Epiteliales&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la fusi&#243;n e internalizaci&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (23)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">b</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2"> -Defensina 2&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C&#233;l. Epiteliales&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la replicaci&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (22)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">b</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2"> -Defensina 3&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C&#233;l. Epiteliales&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la replicaci&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (22)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Lisozima&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Leche materna, saliva, secreci&#243;n nasal y lagrimal&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la replicaci&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (24)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Lactoferrina&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Leche materna, saliva, secreci&#243;n&nbsp; </FONT></P>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> lagrimal y bronquial&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la fusi&#243;n viral con la c&#233;lula hu&#233;sped&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (25,26)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="99" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Catelicidina&nbsp; </FONT></P> </TD> <TD WIDTH="208" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Neutr&#243;filos, Monocitos y Cel. Epiteliales&nbsp; </FONT></P> </TD> <TD WIDTH="237" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe estad&#237;os tempranos    <BR> de la replicaci&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (32)&nbsp; </FONT></P> </TD> </TR> </TABLE> </div> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>P&#201;PTIDOS ANTIMICROBIANOS ANTI-VIH AISLADOS DE VARIAS ESPECIES&nbsp;</B> </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> La indolicid&#237;na ha sido clasificada dentro de la familia de las catelicidinas  (31); fue aislada de leucocitos de bovino en el a&#241;o de 1992 por Selsted  y col. (33). Se han propuesto que el mecanismo de acci&#243;n est&#225; basado en  interacciones con la envoltura viral; esto no han sido confirmado (34).&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Otra clase de defensinas aislada por primera vez de medula &#243;sea de monos  de la especie <I>Macacca mulatta</I> han sido denominadas  </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> q</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (theta) defensinas.  Estos son octadecap&#233;ptidos circulares derivados de dos precursores cada  uno de los cuales contribuye un nonap&#233;ptido a la mol&#233;cula madura (35-37).  Debido a que los precursores de genes id&#233;nticos o diferentes pueden ser  fusionados para generar p&#233;ptidos maduros; esto le permite a la familia  de las </FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> q</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> defensinas generar una gran variedad estructural a trav&#233;s de un  solo mecanismo post-traduccional (35, 37). Estos p&#233;ptidos tienen similitud  con p&#233;ptidos antimicrobianos derivados de plantas como los cicl&#243;tidos,  debido a que muestran una estructura c&#237;clica resistente a la degradaci&#243;n  proteol&#237;tica. El mecanismo mediante el cual las theta defensinas de mono  act&#250;an contra el virus del VIH consiste en inhibir la fusi&#243;n viral. Al  parecer este mecanismo bloquea la uni&#243;n a CD4 y a los co-receptores CXCR4  y CCR5, puesto que mediante ensayos de colocalizaci&#243;n se demostr&#243; la uni&#243;n  de la retrociclina a estos receptores. En ensayos con las cepas del VIH  X5 y R4 se demostr&#243; disminuci&#243;n de la replicaci&#243;n cuando eran expuestos  a la retrociclina. Tambi&#233;n se une a CD4, aunque no es capaz de inhibir  la uni&#243;n CD4 y GP120 completamente (38, 39). P&#233;ptidos como estos que muestran  resistencia a la degradaci&#243;n proteol&#237;tica pueden ser usados en formulaciones  de aplicaci&#243;n t&#243;pica y persistir por un tiempo prolongado recubriendo la  mucosa vaginal, previniendo de esta manera la infecci&#243;n.&nbsp; </FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Las protegrinas son p&#233;ptidos estructuralmente similares a las defensinas  de humano, ya que muestran una conformaci&#243;n de hoja beta plegada con dos  puentes disulfuro no circulares (40). En la d&#233;cada pasada fueron descritas  las propiedades anti-VIH de estas mol&#233;culas, tanto en forma lineal como  las formas cicladas de estos p&#233;ptidos. El mecanismo de inhibici&#243;n de la  replicaci&#243;n viral sucede previo a la adsorci&#243;n viral puesto que el pre  tratamiento del in&#243;culo viral con los p&#233;ptidos sint&#233;ticos reduce el porcentaje  de c&#233;lulas infectadas, aunque los detalles de dicho mecanismo no se conocen  a&#250;n (41, 42).&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> En el a&#241;o 2002, diversos grupos de investigadores describieron la existencia  de mol&#233;culas muy similares a las defensinas humanas en algunas especies  de plantas (43, 44) que se denominaron &#147;cicl&#243;tidos&#148;. Estos cicl&#243;tidos han  llamado la atenci&#243;n de los cient&#237;ficos por sus particulares propiedades  qu&#237;micas, ya que est&#225;n completamente ciclados y tienen 6 residuos de ciste&#237;na  formando 3 puentes disulfuro que los hacen resistentes a la degradaci&#243;n  proteol&#237;tica por exoproteasas y endoproteasas (45). Estos p&#233;ptidos antimicrobianos  han sido aislados principalmente en plantas tropicales de las familias  <I>Violaceae</I> y <I>Rubiaceae</I> y de especies como <I>Chasalia parvifolia, Psychotria  longipes </I>y<I> Oldenlandia affinis</I> (45). Los primeros cicl&#243;tidos que mostraron  actividad anti-VIH fueron identificados en el programa de productos naturales  con actividad contra VIH del NIC (<I>National Institute of Cancer</I>, por sus  siglas en ingl&#233;s) de Estados Unidos.&nbsp; </FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Los cicl&#243;tidos presentan varias ventajas con respecto a otros p&#233;ptidos,  tal es el caso de su estabilidad t&#233;rmica, qu&#237;mica y tolerancia a la degradaci&#243;n  enzim&#225;tica. Estas propiedades los hacen prospectos muy atractivos para  su uso como antivirales como se muestra en la <a href="#TABLA_II">Tabla II</a> en que se describen  los mecanismos de acci&#243;n de estos p&#233;ptidos. Se han identificado las secuencias  m&#237;nimas que son responsables de la actividad antiviral para reducir su  costo de s&#237;ntesis, adem&#225;s de la producci&#243;n recombinante para ayudar al  plegamiento apropiado de estos p&#233;ptidos.</FONT></P> </MULTICOL>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B><a name="TABLA_II">TABLA II</a></B></FONT></P>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> AMP&#180;S DE DIVERSAS ESPECIES CON ACTIVIDAD CONTRA VIH</FONT></P>     <div align="center"> <TABLE cellspacing="1" width="580" border="1" id="table2"> <TR> <TD WIDTH="64" VALIGN="TOP" BGCOLOR="#c3c3c2"> <font face="Verdana" size="2">&nbsp;</font></TD> <TD WIDTH="144" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Especie&nbsp; </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> P&#233;ptido&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Mecanismo de actividad antiviral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Referencia&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="64" ROWSPAN="3">     ]]></body>
<body><![CDATA[<P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Mam&#237;feros&nbsp; </FONT></P> </TD> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Bos taurus&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Indolicidina&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Agregaci&#243;n y ruptura de la envoltura viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (34)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Macacca mulatta&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"> <FONT COLOR="#1f1a17" FACE="Symbol" SIZE="2">q</FONT><FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2">-Defensina&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la fusi&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (37, 38)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Sus scrofa&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Protegrinas&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la fusi&#243;n viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (40-42)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="64" ROWSPAN="7">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Plantas&nbsp; </FONT></P> </TD> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Chassalia parvifolia&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Circulina A&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la infecci&#243;n viral, se desconoce el mecanismo&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (45)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Chassalia parvifolia&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Circulina B&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibe la infecci&#243;n viral, se desconoce el mecanismo&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (45)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Oldenlandia affinis    <BR> Viola yedoensis&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Kalata B1&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Agregaci&#243;n y ruptura de la membrana viral&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (58)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Leonia cymosa&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Cicloviolina B&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Produce lisis viral, altamente citot&#243;xica, se desconoce el mecanismo de  acci&#243;n&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (45)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Palicourea condensata&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Palicoure&#237;na&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Produce lisis viral, es citot&#243;xica, se desconoce el mecanismo de acci&#243;n&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (45)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Momordica cochichinensis&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> MCoT-I y MCoT-II&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Produce lisis viral, se desconoce el mecanismo de acci&#243;n&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (45)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Viola baoshanensis    ]]></body>
<body><![CDATA[<BR> Viola yedoensis&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Cicloviolacina Y5&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Produce lisis viral, se desconoce el mecanismo de acci&#243;n&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (59)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="64" ROWSPAN="11">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Insectos, anfibios y otras especies&nbsp; </FONT></P> </TD> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Limulus polyphemus&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Polifemusina II, T22, T140 y T14012&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inhibici&#243;n de la fusi&#243;n viral a trav&#233;s del antagonismo con CXCR4*&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (47, 48)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Tachyplesus tridentatus&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Tachyplesina&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> <TD WIDTH="64" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Apis mellifera &nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Melitina&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Supresi&#243;n de la expresi&#243;n de genes del VIH&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (60-62)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Hyalophora cecropia&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Cecropina&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> <TD WIDTH="64" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Bombina maxima&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Maximina 3&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Similar al de mellitina &#135;&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (56, 63)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Nostoc ellipsosporum&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Cyanovirina-N&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Interviene con la fusi&#243;n viral al interactuar con gp120&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (64)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Bacillus brevis&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Gramicidina D&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Desconocido&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Litoria caerulea&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Caerina 1.1&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Interacci&#243;n con estructuras lip&#237;dicas del viri&#243;n&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (51)&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Litoria chloris &nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Caerina 1.9&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> <TD WIDTH="64" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Litoria genimaculata&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Maculatina 1.1&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> <TD WIDTH="64" VALIGN="TOP"> <font face="Verdana" size="2">&nbsp;</font></TD> </TR> <TR> <TD WIDTH="144" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <I>Phylomedusa sauvagei&nbsp;</I> </FONT></P> </TD> <TD WIDTH="96" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Dermaseptina&nbsp; </FONT></P> </TD> <TD WIDTH="241" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Interacciones con el viri&#243;n&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> (65)&nbsp; </FONT></P> </TD> </TR> </TABLE> </div>     ]]></body>
<body><![CDATA[<blockquote> 	    <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">&#135; Mecanismo propuesto por el autor, debido a semejanzas estructurales.</FONT></P> 	    <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">* CXCR4, es un receptor de quimiocinas con el que interacciona el VIH.</FONT></P> </blockquote> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Por estudios en diversas especies de animales sabemos que el sistema inmune  innato, y en particular los p&#233;ptidos antimicrobianos son la principal barrera  contra las infecciones en una gran cantidad de especies (4, 46). Como ejemplo  de estos p&#233;ptidos con actividad anti-VIH tenemos a los p&#233;ptidos aislados  de dos especies de cangrejos herradura: las polifemusinas aisladas de <I>Limulus  polyphemus</I> y las tachyplesinas, que fueron recuperadas de la especie americana  <I>Tachyplesus tridentatus.</I> Ambos p&#233;ptidos fueron purificados de lisados celulares  de hemocitos de estas dos especies (47, 48). Estos p&#233;ptidos antimicrobianos  tienen una estructura similar a la de las protegrinas con hojas beta anti  paralelas estabilizadas por dos puentes disulfuro (41). Algunas porciones  de polifemusina II como T22, T140 y TC14012 son antagonistas altamente  efectivos de la fusi&#243;n del virus del VIH, al parecer esta inhibici&#243;n se  encuentra mediada por el antagonismo del receptor de quimiocinas CXCR4  (49).&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Otra fuente importante de p&#233;ptidos antimicrobianos en la naturaleza es,  sin duda, alguna las secreciones de la piel de los anfibios, ya que alrededor  del 20 % de los p&#233;ptidos antimicrobianos reportados a la fecha han sido  aislados de anfibios anuros, pues en su piel abundan estas mol&#233;culas (50).  Los p&#233;ptidos antimicrobianos de anfibios (A-AMP&#180;s, por sus siglas en ingl&#233;s)  tienen una longitud aproximada de 11-46 a.a. y se encuentran almacenados  en gl&#225;ndulas granulares especializadas de la piel. Este grupo de p&#233;ptidos  han mostrado gran potencial para reducir la transmisibilidad del virus  del VIH, puesto que en estudios recientes se ha observado su capacidad  de inhibir la replicaci&#243;n viral; entre los principales p&#233;ptidos con actividad  antiviral identificados a la fecha se encuentran: La caerina 1.1 aislado  de <I>Litoria caerulea,</I> la caerina 1.9 de <I>Litoria chloris</I> y la maculatina  1.1 aislada de <I>Litoria genimaculata.</I> El mecanismo de acci&#243;n por el cual  estos tres p&#233;ptidos inhiben la replicaci&#243;n viral parece estar mediado por  la disrupci&#243;n de las membranas del viri&#243;n a concentraciones muy por debajo  de las concentraciones citot&#243;xicas (51). Esto los hace un atractivo agente  terap&#233;utico por el hecho de que puede ser usado para reducir la viremia  por un mecanismo de acci&#243;n que, al no depender de la replicaci&#243;n del virus,  puede reducir la generaci&#243;n de cepas resistentes.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> El comprender los mecanismos por los cuales los p&#233;ptidos antimicrobianos  inhiben los diversos procesos de replicaci&#243;n viral ayudar&#225; a entender mejor  el virus, as&#237; como a dise&#241;ar mejores tratamientos. En la  <a href="#fig1">Fig. 1</a> se muestra  un panorama general de los mecanismos de acci&#243;n conocidos para p&#233;ptidos  naturales y sint&#233;ticos. Se describen los diferentes pasos del proceso de  infecci&#243;n en los cuales se han observado interferencias mediadas por p&#233;ptidos  antimicrobianos y que adem&#225;s muestran potencial terap&#233;utico; gran parte  de los p&#233;ptidos antimicrobianos con actividad contra VIH tienen un mecanismo  que bloquea la infecci&#243;n viral o que inhibe la transferencia del virus,  mecanismos que anteriormente no han sido blanco de otros agentes terap&#233;uticos.</FONT></P>     <P ALIGN="center"><a name="fig1"> <img border="0" src="/img/fbpe/ic/v53n1/art08fig1.gif" width="575" height="814"></a></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     
<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>APLICACIONES CL&#205;NICAS BASADAS EN AMP&#146;S&nbsp;</B> </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> En apartados anteriores y como se describe en la <a href="#TABLA_II">Tabla II</a>, existen una  gran cantidad de mol&#233;culas basadas en p&#233;ptidos antimicrobianos con diversas  estructuras y tama&#241;os que muestran actividad anti-VIH. Esta amplia variedad  de mol&#233;culas muestran variados mecanismos de acci&#243;n; sin embargo, no existe  en la actualidad ning&#250;n prospecto para ser candidato a ensayos cl&#237;nicos  para el tratamiento de VIH. Para resaltar el potencial de este tipo de  mol&#233;culas de ser usadas en el tratamiento de diversas afecciones, en la  <a href="#TABLA_III">Tabla III</a> se muestran compuestos derivados de p&#233;ptidos antimicrobianos  que se encuentran actualmente en ensayos cl&#237;nicos, algunos ya en etapas  avanzadas para el tratamiento de diversas infecciones y afecciones. De  esta manera, se ilustra la viabilidad del uso de los p&#233;ptidos antimicrobianos  para el tratamiento de la infecci&#243;n por VIH (<a href="#TABLA_III">Tabla III</a>).</FONT></P> </MULTICOL>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B><a name="TABLA_III">TABLA III</a></B></FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> DESARROLLO FARMAC&#201;UTICO DE COMPUESTOS BASADOS EN P&#201;PTIDOS ANTIMICROBIANOS</FONT></P>     <div align="center"> <TABLE cellspacing="1" width="580" border="1" id="table3"> <TR> <TD WIDTH="132" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Compa&#241;&#237;a&nbsp; </FONT></P> </TD> <TD WIDTH="105" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Compuesto&nbsp; </FONT></P> </TD> <TD WIDTH="182" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase, Registro&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Afecci&#243;n/enfermedad&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="132" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Access Pharmaceuticals&nbsp; </FONT></P> </TD> <TD WIDTH="105" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Pexiganan (MSI-78)&nbsp; </FONT></P> </TD> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase III (NCT00563433, NCT00563394)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Ulceras de pi&#233; diab&#233;tico&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="132" ROWSPAN="4">     ]]></body>
<body><![CDATA[<P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Agennix&nbsp; </FONT></P> </TD> <TD WIDTH="105" ROWSPAN="4">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Lactoferrina (Talactoferrin)&nbsp; </FONT></P> </TD> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase II (NCT 00630656)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Sepsis Severa&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase I (NCT00923741)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C&#225;ncer pulmonar&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase II (NCT00095186)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Carcinoma Renal&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase I/II (NCT00854633)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Infecciones nosocomiales en infantes prematuros&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="132" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> AM Pharma&nbsp; </FONT></P> </TD> <TD WIDTH="105" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Lactoferrina (hLF1-11)&nbsp; </FONT></P> </TD> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase I/II (NCT00509938)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Infecciones bacterianas y micosis en transplantes de m&#233;dula &#243;sea.&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="132" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Cadence Pharmaceuticals&nbsp; </FONT></P> </TD> <TD WIDTH="105" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Omiganan (Omigard)&nbsp; </FONT></P> </TD> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase III (NCT00231153)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Prevenci&#243;n de infecciones en la zona del cat&#233;ter&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="132" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Inimex pharmaceuticals&nbsp; </FONT></P> </TD> <TD WIDTH="105" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> IMX942&nbsp; </FONT></P> </TD> <TD WIDTH="182" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase I/II agosto 2011&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Infecciones nosocomiales&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="132" ROWSPAN="2">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Lytix biopharma AS&nbsp; </FONT></P> </TD> <TD WIDTH="105" ROWSPAN="2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> LTX-109&nbsp; </FONT></P> </TD> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase I/IIa (NCT011158235)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Infecci&#243;n nasal con MRSA*&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="182" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Fase II (NCT01223222)&nbsp; </FONT></P> </TD> <TD WIDTH="186" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Dermatosis&nbsp; </FONT></P> </TD> </TR> </TABLE> </div>     <blockquote> 	    <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">*MRSA. methicillin resistant 	<I>Staphylococcus aureus</I>. &nbsp;NCT: N&#250;mero de registro  de ensayo cli&#237;nico (<a href="http://www.clinicaltrials.gov">www.clinicaltrials.gov</a>).</FONT></P> </blockquote> <MULTICOL GUTTER="31" COLS="2"> </MULTICOL> <MULTICOL GUTTER="31" COLS="2"> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>OBSERVACIONES FINALES&nbsp;</B> </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Debido a que varios p&#233;ptidos antimicrobianos del humano pueden ser inducidos  mediante el uso de mol&#233;culas peque&#241;as como amino&#225;cidos y otras mol&#233;culas  (52, 53), es posible que la inducci&#243;n de estos p&#233;ptidos pudiesen incrementar  la efectividad de las mucosas para detener el virus. Adem&#225;s, se ha demostrado  la efectividad y seguridad de algunos de estos inductores que pudiesen  ser utilizados en formulaciones orales o en geles de aplicaci&#243;n t&#243;pica.  Algunas estrategias novedosas han sido propuestas, tal es el caso del uso  de bacterias de la microbiota normal vaginal capaces de producir alg&#250;n  p&#233;ptido antimicrobiano como la cyanovirina-N en bacterias productoras de  &#225;cido l&#225;ctico con el objeto de ser usados como agentes productores de este  p&#233;ptido en la mucosa vaginal (54).&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> El caso de los cicl&#243;tidos merece especial atenci&#243;n, ya que se desconocen  varios de los mecanismos de inhibici&#243;n de la replicaci&#243;n viral y pueden  abrir una nueva ventana de oportunidades en el dise&#241;o de f&#225;rmacos, puesto  que pueden estar relacionados a mecanismos de acci&#243;n que no han sido identificados  como blancos farmacol&#243;gicos; adem&#225;s, estrategias basadas en la identificaci&#243;n  de las secuencias pept&#237;dicas m&#237;nimas que retienen actividad antiviral,  disminuir&#225;n los costos de producci&#243;n de estas mol&#233;culas de forma recombinante  o por s&#237;ntesis en fase s&#243;lida.&nbsp; </FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Las caerinas y las alfa-defensinas, pueden ser usadas como templados para  la producci&#243;n de an&#225;logos con propiedades similares; es decir, mol&#233;culas  que sean capaces de inhibir la transferencia de los viriones de c&#233;lulas  infectadas, rompiendo as&#237; el c&#237;rculo de transmisi&#243;n. De nuestro conocimiento,  los mecanismos involucrados en la inhibici&#243;n de la transferencia de viriones  no han sido elucidados en su totalidad; al entender estos mecanismos es  probable que encontremos nuevos blancos terap&#233;uticos.&nbsp; </FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> La b&#250;squeda de agentes terap&#233;uticos para el tratamiento de la infecci&#243;n  por VIH es una creciente necesidad, los p&#233;ptidos antimicrobianos muestran  grandes posibilidades de desarrollo para este fin; adem&#225;s, ya que sus mecanismos  de actividad antiviral no han sido previamente en otros f&#225;rmacos, reducir&#225;n  el desarrollo de cepas resistentes, que es un grave problema en la actualidad.</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>REFERENCIAS</B></FONT></P>     <!-- ref --><P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 1.&nbsp;<B>UNAIDS.</B> Global Report: Unaids Report on the Global Aids Epidemic 2010.  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