<?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>0120-4157</journal-id>
<journal-title><![CDATA[Biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Biomédica]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572006000300015</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Factores solubles con actividad inhibitoria contra el virus de la inmunodeficiencia humana tipo 1]]></article-title>
<article-title xml:lang="en"><![CDATA[Soluble factors with inhibitory activity against type 1 Human Immunodeficiency Virus]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zapata]]></surname>
<given-names><![CDATA[Wildeman]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montoya]]></surname>
<given-names><![CDATA[Carlos Julio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rugeles]]></surname>
<given-names><![CDATA[María Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Grupo de Inmunovirología-Biogénesis]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2006</year>
</pub-date>
<volume>26</volume>
<numero>3</numero>
<fpage>451</fpage>
<lpage>466</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572006000300015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572006000300015&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572006000300015&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La patogénesis de la infección por el VIH-1 es un proceso complejo que depende de múltiples factores, incluyendo los de origen viral, la respuesta inmune y los factores genéticos del hospedero. Debido a esto, se observa que en los individuos infectados por el VIH-1 existen diferentes patrones de progresión de la enfermedad, mientras que algunos individuos que se exponen repetidamente al virus permanecen sanos y seronegativos. Esta variabilidad luego de la exposición al VIH-1 sugiere que existen mecanismos de resistencia natural contra esta infección. Si bien en algunos individuos expuestos seronegativos y en infectados no progresores a largo término, se ha podido determinar que la resistencia se da por mecanismos genéticos o inmunológicos, existe un porcentaje importante de casos de resistencia para los cuales no ha sido posible establecer el mecanismo protector. Varios factores solubles, como las defensinas, las quimiocinas, los interferones y las ribonucleasas, entre otros, producidos por células del sistema inmune y por células de varios tejidos epiteliales, tienen una reconocida actividad antiviral que podría estar involucrada en la protección del hospedero durante la exposición al VIH-1. Conocer adecuadamente los mecanismos de acción de estos factores y su papel en la resistencia natural a la infección por el VIH-1 puede ser útil al momento de diseñar nuevas estrategias terapéuticas para combatir la morbilidad y mortalidad asociadas con la pandemia por el VIH-1.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The pathogenesis of HIV-1 infection is a complex process that depends on multiple factors, including viral and host immune and genetic characteristics. This leads to a variable pattern of disease progression among those HIV-1-exposed individuals who become infected, while there are a number of individuals who remain healthy and HIV-1 seronegative despite being serially exposed to HIV-1. These variable outcomes of HIV-1 exposure suggest that there are mechanisms of natural resistance to HIV-1 infection. Although several genetic and adaptive immune mechanisms of resistance have been reported in some exposed seronegative and long-term non-progressor individuals, the mechanisms involved in controlling the establishment and progression of HIV-1 infection are not fully understood. Several soluble factors, such as defensins, chemokines, interferons and ribonucleases, among others, produced by cells of the immune system and epithelial tissues, have a broad anti-viral activity that might play a role as protective mechanisms during HIV-1 exposure. A better understanding of the mechanisms and role of these soluble factors during the natural resistance to HIV-1 infection may have important implications for the design of novel therapeutic strategies to combat the morbidity and mortality associated with the HIV-1 pandemic.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[VIH-1]]></kwd>
<kwd lng="es"><![CDATA[resistencia natural]]></kwd>
<kwd lng="es"><![CDATA[ribonucleasas]]></kwd>
<kwd lng="es"><![CDATA[interferones]]></kwd>
<kwd lng="es"><![CDATA[defensinas]]></kwd>
<kwd lng="es"><![CDATA[quimiocinas]]></kwd>
<kwd lng="en"><![CDATA[HIV-1]]></kwd>
<kwd lng="en"><![CDATA[immunity, natural]]></kwd>
<kwd lng="en"><![CDATA[ribonucleases]]></kwd>
<kwd lng="en"><![CDATA[interferons]]></kwd>
<kwd lng="en"><![CDATA[defensins]]></kwd>
<kwd lng="en"><![CDATA[chemokines]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[   <B><FONT FACE="Arial" SIZE=4>    <P>&nbsp;</P>     <P ALIGN="CENTER">Factores solubles con actividad inhibitoria contra el virus de la inmunodeficiencia humana tipo 1</P><DIR>  </B></FONT><FONT FACE="Arial">    <P ALIGN="CENTER">Wildeman Zapata, Carlos Julio Montoya, Mar&iacute;a Teresa Rugeles</P>     <P>Grupo de Inmunovirolog&iacute;a-Biog&eacute;nesis, Facultad de Medicina, Universidad de Antioquia, Medell&iacute;n, Colombia.</P>     <P>La patog&eacute;nesis de la infecci&oacute;n por el VIH-1 es un proceso complejo que depende de m&uacute;ltiples factores, incluyendo los de origen viral, la respuesta inmune y los factores gen&eacute;ticos del hospedero. Debido a esto, se observa que en los individuos infectados por el VIH-1 existen diferentes patrones de progresi&oacute;n de la enfermedad, mientras que algunos individuos que se exponen repetidamente al virus permanecen sanos y seronegativos. Esta variabilidad luego de la exposici&oacute;n al VIH-1 sugiere que existen mecanismos de resistencia natural contra esta infecci&oacute;n. Si bien en algunos individuos expuestos seronegativos y en infectados no progresores a largo t&eacute;rmino, se ha podido determinar que la resistencia se da por mecanismos gen&eacute;ticos o inmunol&oacute;gicos, existe un porcentaje importante de casos de resistencia para los cuales no ha sido posible establecer el mecanismo protector. Varios factores solubles, como las defensinas, las quimiocinas, los interferones y las ribonucleasas, entre otros, producidos por c&eacute;lulas del sistema inmune y por c&eacute;lulas de varios tejidos epiteliales, tienen una reconocida actividad antiviral que podr&iacute;a estar involucrada en la protecci&oacute;n del hospedero durante la exposici&oacute;n al VIH-1. Conocer adecuadamente los mecanismos de acci&oacute;n de estos factores y su papel en la resistencia natural a la infecci&oacute;n por el VIH-1 puede ser &uacute;til al momento de dise&ntilde;ar nuevas estrategias terap&eacute;uticas para combatir la morbilidad y mortalidad asociadas con la pandemia por el VIH-1.</P> <B>    <P>Palabras clave:</B> VIH-1, resistencia natural, ribonucleasas, interferones, defensinas, quimiocinas.</P> <B>    <P>Soluble factors with inhibitory activity against type 1 Human Immunodeficiency Virus</P> </B>    <P>The pathogenesis of HIV-1 infection is a complex process that depends on multiple factors, including viral and host immune and genetic characteristics. This leads to a variable pattern of disease progression among those HIV-1-exposed individuals who become infected, while there are a number of individuals who remain healthy and HIV-1 seronegative despite being serially exposed to HIV-1. These variable outcomes of HIV-1 exposure suggest that there are mechanisms of natural resistance to HIV-1 infection. Although several genetic and adaptive immune mechanisms of resistance have been reported in some exposed seronegative and long-term non-progressor individuals, the mechanisms involved in controlling the establishment and progression of HIV-1 infection are not fully understood. Several soluble factors, such as defensins, chemokines, interferons and ribonucleases, among others, produced by cells of the immune system and epithelial tissues, have a broad anti-viral activity that might play a role as protective mechanisms during HIV-1 exposure. A better understanding of the mechanisms and role of these soluble factors during the natural resistance to HIV-1 infection may have important implications for the design of novel therapeutic strategies to combat the morbidity and mortality associated with the HIV-1 pandemic.</P> <B>    <P>Key words: </B>HIV-1, immunity, natural, ribonucleases, interferons, defensins, chemokines.</P></DIR>      ]]></body>
<body><![CDATA[<P>El virus de la inmunodeficiencia humana (VIH) fue descubierto en 1983 y un a&ntilde;o m&aacute;s tarde se identific&oacute; como la causa del s&iacute;ndrome de inmunodeficiencia adquirida (sida) (1). En la actualidad, 40,3 millones de personas est&aacute;n infectadas con el VIH alrededor del mundo y anualmente ocurren 4,9 millones de nuevas infecciones, de las cuales casi el 50% corresponde a infecciones en mujeres (2). En Colombia se estima que el n&uacute;mero de individuos infectados con el VIH es de 190.000, para una prevalencia de la infecci&oacute;n del 0,4 al 1,2% (3).</P>     <P>La infecci&oacute;n por el VIH-1 se caracteriza por la disminuci&oacute;n progresiva en el n&uacute;mero y funci&oacute;n de linfocitos T CD4+, c&eacute;lulas fundamentales en la inducci&oacute;n de una respuesta inmune humoral y celular; estas c&eacute;lulas son el principal blanco del virus y su disminuci&oacute;n induce una grave inmunodeficiencia que se asocia con la aparici&oacute;n de infecciones oportunistas que, en &uacute;ltima instancia, conducen a la muerte (4). </P>     <P>El VIH-1 se transmite por contacto sexual no protegido con un individuo seropositivo (SP), por la exposici&oacute;n a sangre infectada o sus derivados, durante el embarazo, en el nacimiento, o por medio de la alimentaci&oacute;n materna (2,5). Sin embargo, a pesar de que la transmisi&oacute;n sexual es de las menos eficientes, se estima que m&aacute;s del 80% de las infecciones por VIH-1 se adquieren por esta v&iacute;a (6). </P>     <P>La patog&eacute;nesis de la infecci&oacute;n por el VIH-1 es un proceso complejo y variable. Los individuos infectados exhiben diferentes velocidades de progresi&oacute;n hacia el sida; el 10% desarrolla sida en menos de cinco a&ntilde;os, mientras que el 80% desarrolla la inmunodeficiencia en un promedio de 8 a 10 a&ntilde;os. De otro lado, entre 8 y 10% de los individuos infectados se consideran progresores lentos o no progresores (LTNP, del ingl&eacute;s <I>Long Term Non-Progressors</I>) y se caracterizan porque en ausencia de antirretrovirales permanecen asintom&aacute;ticos por m&aacute;s de 10 a&ntilde;os, sin deterioro inmunol&oacute;gico y con cargas virales bajas o indetectables (7,8). Adicionalmente, existen individuos que a pesar de haber estado expuestos en m&uacute;ltiples ocasiones sin protecci&oacute;n al VIH-1 no muestran evidencia cl&iacute;nica ni serol&oacute;gica de la infecci&oacute;n; estas personas se conocen como expuestos seronegativos (ESN) (9). La existencia del grupo de ESN, as&iacute; como de LTNP, hace evidente la existencia de mecanismos de resistencia natural a la infecci&oacute;n y a su progreso. </P>     <P>Los mecanismos de resistencia dependen tanto del virus como del hospedero; las cepas virales defectuosas o atenuadas (10) y la exposici&oacute;n a in&oacute;culos virales muy bajos reducen la posibilidad de infecci&oacute;n (11). En el hospedero, el principal mecanismo que confiere un alto grado de resistencia a la infecci&oacute;n por el VIH es la mutaci&oacute;n D32 en el gen que codifica para el correceptor viral CCR5 (12,13). Sin embargo, el genotipo D32/D32 est&aacute; presente &uacute;nicamente en 2 a 4% de las personas caucasoides y ESN (14-16). Otras mutaciones en genes del sistema de las quimiocinas se relacionan con una progresi&oacute;n lenta de la infecci&oacute;n m&aacute;s que con resistencia a la misma (17,18). El grado de concordancia del complejo mayor de histocompatibilidad (CMH) clase I entre la madre y el feto es un factor determinante de la incidencia de la transmisi&oacute;n vertical (19), al igual que la presencia de ciertos alelos del CMH I y II (10). La respuesta inmune celular adaptativa es el principal mecanismo antiviral mediante la actividad citot&oacute;xica de c&eacute;lulas T CD8+ (CTL), las cuales son m&aacute;s efectivas en el control de la replicaci&oacute;n viral que los anticuerpos espec&iacute;ficos para el VIH-1 (4). Recientemente han cobrado importancia factores solubles que son secretados por diferentes c&eacute;lulas durante el proceso de respuesta inmune y que muestran gran capacidad antiviral, bien sea como funci&oacute;n primaria o por efecto "accidental". Esto ha llevado a proponer un nuevo modelo de inmunidad antiviral que implica la supresi&oacute;n de la replicaci&oacute;n viral sin eliminar la c&eacute;lula infectada y que podr&iacute;a potenciar los meca-nismos celulares espec&iacute;ficos anti-VIH-1. Entre los factores solubles con actividad antiviral reportada se destacan las b-quimiocinas, como CCL5 (RANTES), CCL3 (MIP1-a) y CCL4 (MIP1-b) (20), la CXCL12 o factor 1 derivado de c&eacute;lulas estromales (SDF-1) (18), el factor antiviral de linfocitos T CD8+ (CAF) (21), los interferones (IFN) (22), el factor inhibidor de leucemia (LIF) (23), lisozimas y RNasas asociadas a la gonadotropina cori&oacute;nica humana (24,25), un factor estimulado por aloant&iacute;genos (ASF) (26), las defensinas (27,28), el inhibidor de proteasas secretado por leucocitos (SLPI) (29) y otros m&aacute;s recientemente definidos como las prote&iacute;nas con motivos TRIM (30).</P>     <P>Esta revisi&oacute;n se centrar&aacute; en los factores solubles con actividad antiviral mejor caracterizados y har&aacute; especial &eacute;nfasis en aquellos que demuestran una clara actividad anti-VIH, describiendo los mecanismos antivirales que se han propuesto y las evidencias reportadas hasta el momento. En la </FONT><A HREF="#figura1">figura 1</A><FONT FACE="Arial"> se se&ntilde;alan los sitios potenciales de acci&oacute;n de los diferentes factores solubles.</P>     <P><A NAME="figura1"></A></P> </FONT>    <P ALIGN="CENTER"><IMG SRC="/img/revistas/bio/v26n3/3a15i1.jpg"></P> <B><FONT FACE="Arial">    <P>Defensinas </P> </B>    <P>Las defensinas son p&eacute;ptidos peque&ntilde;os de 18 a 42 amino&aacute;cidos y de 3 a 5 kDa, cati&oacute;nicos, anfip&aacute;ticos y con actividad microbicida contra un amplio grupo de microorganismos, incluidas bacterias gram-positivas, gram-negativas, protozoos, hongos y virus (31,32). Las defensinas son p&eacute;ptidos ricos en cisteina que se unen mediante tres enlaces disulfuro intramoleculares; son producidas principalmente por c&eacute;lulas epiteliales en diferentes mucosas, as&iacute; como por c&eacute;lulas del sistema inmune, ya sea en forma constitutiva o en respuesta a productos microbia-nos o citocinas proinflamatorias (31,33,34). Con base en su tama&ntilde;o y su secuencia de amino&aacute;cidos y en la distribuci&oacute;n de los puentes disulfuro entre ciste&iacute;nas, las defensinas en mam&iacute;feros se clasifican en tres grupos: a, b y q (31); en humanos s&oacute;lo se ha descrito la presencia de las defensinas a y b (35). </P> <B><I>    ]]></body>
<body><![CDATA[<P>Mecanismos inhibitorios</P> </B></I>    <P>La actividad microbicida de las defensinas est&aacute; dada por la capacidad de unirse a los componentes cargados negativamente de la membrana de los microorganismos, como el lipopolisacarido (LPS), el &aacute;cido teicoico y el fosfatidil-glicerol, entre otros (36). Esta interacci&oacute;n altera la integridad de la membrana o crea poros que llevan a la muerte del microorganismo (36). </P>     <P>Adicionalmente, las defensinas cumplen otra funci&oacute;n importante, diferente a su acci&oacute;n microbicida directa, y es su capacidad quimiot&aacute;ctica reportada ya hace 17 a&ntilde;os (37); esto indica que las defensinas potencian la respuesta inmune innata y adaptativa (38). </P>     <P>Las evidencias mostradas hasta el momento de los posibles mecanismos de acci&oacute;n antiviral de las defensinas, y espec&iacute;ficamente anti-VIH-1, son variadas y dependen del tipo de defensina; a continuaci&oacute;n se describir&aacute;n las principales caracter&iacute;sticas de las a y b defensinas humanas, incluyendo su papel antiviral.</P> <B>    <P>a defensinas</P> </B>    <P>Hasta el momento hay 6 a defensinas humanas identificadas: las HNP-1-4 son abundantes en neutr&oacute;filos y macr&oacute;fagos, pero tambi&eacute;n son producidas por c&eacute;lulas NK, linfocitos B y c&eacute;lulas T gd activadas por citocinas (39). Las a defensinas humanas 5 y 6 (HD-5 y HD-6) son producidas principalmente por las c&eacute;lulas Paneth del intestino delgado (36). </P> <B><I>    <P>Mecanismos inhibitorios</P> </B></I>    <P>En 1993 se report&oacute; por primera vez la inhibici&oacute;n <I>in vitro</I> de la replicaci&oacute;n del VIH-1 por a defensinas, lo que sugiere su papel protector durante la infecci&oacute;n <I>in vivo </I>(39-42). En esos estudios se observ&oacute; que estos p&eacute;ptidos inhiben la infecci&oacute;n por el VIH-1 despu&eacute;s de la entrada viral, y que esta actividad no se ve afectada por la presencia de suero (40). Posteriormente se demostr&oacute; que las HNP-1-3 purificadas de neutr&oacute;filos humanos, as&iacute; como las HNP recombinantes, bloquean la infecci&oacute;n por el VIH-1 despu&eacute;s de la entrada viral (36). Adicionalmente, el tratamiento previo de c&eacute;lulas con HNP-1 y lavado posterior antes de la infecci&oacute;n con VIH-1 bloque&oacute; la infecci&oacute;n por el VIH-1, indicando que no es necesario un efecto directo sobre el virus para inhibir la replicaci&oacute;n viral (39); en este estudio los autores proponen que el efecto de las a defensinas sobre el ciclo viral ocurre despu&eacute;s de la entrada del virus y probablemente despu&eacute;s de la integraci&oacute;n del ADN viral (39). Otros estudios demostraron un mecanismo dual para la acci&oacute;n de las a defensinas, con el cual &eacute;stas pueden inhibir la infecci&oacute;n por un mecanismo directo sobre el virus o por un mecanismo sobre la c&eacute;lula que va a ser infectada (43-45). Chang y colaboradores reportaron un efecto directo de HNP-1 sobre el VIH-1 a un bajo t&iacute;tulo viral y en ausencia de suero (28). Adem&aacute;s, encontraron que HNP-1 inhibe varios pasos despu&eacute;s de la transcripci&oacute;n reversa y de la integraci&oacute;n del virus, as&iacute; como la actividad de la prote&iacute;na cinasa C (PKC) en c&eacute;lulas T CD4+ (28). Teniendo en cuenta que PKC participa en el proceso de la transcripci&oacute;n viral (36, 46), la inhibici&oacute;n de su activaci&oacute;n puede ser uno de los principales mecanismos de regulaci&oacute;n de la infecci&oacute;n ejercida por las a defensinas sobre la c&eacute;lula infectada (28). De otro lado, el efecto directo sobre el viri&oacute;n podr&iacute;a ser mediado por la uni&oacute;n de alta afinidad entre a defensinas y gp120 viral o el receptor viral CD4, ya que se ha reportado que las a defensinas pueden actuar como lectinas (44). Otro mecanismo antiviral puede ser el aumento en la expresi&oacute;n de CC quimiocinas en macr&oacute;fagos infectados con VIH-1 previamente tratados con a defensinas 1 y 2. Los altos niveles de CCL3 (MIP-1a) y CCL4 (MIP-1b) pueden prevenir la infecci&oacute;n de nuevas c&eacute;lulas al ocupar los receptores de quimiocinas necesarios para la entrada del virus (47). </P> <B><I>    <P>Evidencias epidemiol&oacute;gicas</P> </B></I>    <P>Las primeras evidencias epidemiol&oacute;gicas del papel antiviral de las a defensinas fueron obtenidas por Trabattoni y colaboradores, quienes evaluaron la expresi&oacute;n de las a defensinas en mononucleares de sangre perif&eacute;rica (MNSP) y c&eacute;lulas mono-nucleares cervicovaginales de individuos expuestos sexualmente al VIH-1 pero no infectados, en SP y en controles sanos (48). Este estudio se&ntilde;al&oacute; que la producci&oacute;n de HNP-1-3 por c&eacute;lulas T CD8+ fue 10 veces mayor en ESN que en controles sanos, y que esas mismas c&eacute;lulas conten&iacute;an dos veces m&aacute;s RNAm de a defensinas (48). Toda esta evidencia sugiere que las a defensinas juegan un papel muy importante en la inmunidad innata contra el VIH-1 y que podr&iacute;a mediar el efecto protector en algunos de los individuos ESN.</P> <B>    ]]></body>
<body><![CDATA[<P>b defensinas</P> </B>    <P>Hasta la fecha s&oacute;lo se han caracterizado bien seis. Las b defensinas humanas HBD (49), pero con base en estudios gen&oacute;micos se conocen por lo menos 28 HBD (50). Las HBD se expresan en varios tejidos, tales como m&uacute;sculo esquel&eacute;tico, tracto respiratorio, es&oacute;fago, lengua, intestino y piel (35)<I>.</I> HBD-1 se expresa constitutivamente, mientras HBD-2 y 3 son inducidas por productos virales y bacterianos, as&iacute; como por citocinas como la IL-1b o el TNF-a (34, 51-55). HBD-4 se expresa constitutivamente en el test&iacute;culo, aunque puede ser inducida por una infecci&oacute;n bacteriana y su producci&oacute;n parece no verse influenciada por citocinas proinflamatorias (34,56). Por &uacute;ltimo, las HBD m&aacute;s recientemente caracterizadas son la 5 y 6, las cuales se expresan en el epid&iacute;dimo y en las v&iacute;as a&eacute;reas (53,57). </P> <B><I>    <P>Mecanismos inhibitorios</P> </B></I>    <P>La primera evidencia del mecanismo anti-VIH-1 ejercido por las HBD fue reportada por Qui&ntilde;ones y colaboradores (27); ellos encontraron que la infecci&oacute;n por el VIH-1 induce la expresi&oacute;n, en c&eacute;lulas de epitelio oral humano, del RNAm y de prote&iacute;nas de HBD-2 y 3, pero no de HBD-1, y que las HBD-2 y 3 recombinantes, pero no la HBD-1, inhiben la replicaci&oacute;n del virus dependiendo de la concentraci&oacute;n incluso despu&eacute;s de cinco d&iacute;as de infecci&oacute;n y sin inducir efecto citot&oacute;xico visible (27). La inhibici&oacute;n de la replicaci&oacute;n viral fue irreversible y dependi&oacute; en parte de la uni&oacute;n directa de la HBD a la part&iacute;cula viral. Adicionalmente, las HBD inducen la regulaci&oacute;n negativa del correceptor viral CXCR4, pero no de CCR5, en c&eacute;lulas mononucleares y en linfocitos T (27). El mecanismo de interacci&oacute;n entre las HBD y la part&iacute;cula viral no se ha establecido; una posibilidad es que este proceso sea similar al de las a defensinas, en el cual el p&eacute;ptido tiene actividad tipo lectina e interactuar&iacute;a con la gp120 o el CD4 en forma similar a lo reportado para compuestos poliani&oacute;nicos que son capaces de unirse a los sitios cargados positivamente del asa V3 de gp120 bloqueando la uni&oacute;n del virus con su receptor (58,59).</P>     <P>La evidencia m&aacute;s reciente de actividad antiviral presentada por Sun y colaboradores sugiere que las HBD-2 y 3 inhiben la infecci&oacute;n de MNSP por cepas R5 y X4 del VIH-1 dependiendo de la dosis; es interesante que la dosis utilizada en los experimentos (100ug/ml) es similar a la encontrada en la mucosa oral de individuos sanos (60). En el trabajo citado se mostr&oacute; que la HBD-2 tiene un efecto directo sobre el viri&oacute;n, con acumulaci&oacute;n de productos virales tempranos de la transcripci&oacute;n reversa, y no se observ&oacute; modulaci&oacute;n de la expresi&oacute;n de correceptores virales (60). </P> <B><I>    <P>Evidencia epidemiol&oacute;gica</P> </B></I>    <P>Estudios epidemiol&oacute;gicos que estamos realizando en colaboraci&oacute;n con Miguel E. Qui&ntilde;ones (Center for AIDS Research, Cleveland, Estados Unidos), indican que la expresi&oacute;n del RNAm de HBD-2 y 3 en mucosa endocervical de individuos ESN presenta aumento en comparaci&oacute;n con individuos SP y controles sanos (resultados sin publicar). Adicionalmente, estamos trabajando en la b&uacute;squeda de polimorfismos en el gen <I>DEFB-1,</I> que codifica para HBD-1, asociados con resistencia/susceptibilidad; los reportes previos de Braida y colaboradores sugieren que el SNP (del ingl&eacute;s <I>Single-Nucleotide Polymorphism</I>) -44 C/G en una regi&oacute;n altamente conservada entre especies en este mismo gen se asoci&oacute; significativamente con susceptibilidad a la infecci&oacute;n por el VIH-1 en ni&ntilde;os italianos nacidos de madres VIH-1 positivas (61). Nuestros resultados muestran una frecuencia significativamente mayor de otros polimorfismos en esta misma regi&oacute;n entre los individuos ESN, lo que sugiere la asociaci&oacute;n de este gen con el fen&oacute;meno de resistencia/susceptibilidad a la infecci&oacute;n por el VIH-1 (resultados sin publicar). Todas estas evidencias resaltan el posible papel de las HBD en la protecci&oacute;n de la mucosa oral y de otras superficies mucosas durante la exposici&oacute;n al VIH-1. </P> <B>    <P>Quimiocinas</P> </B>    <P>&Eacute;stas son citocinas de bajo peso molecular (8-17 Kd) con actividad quimiot&aacute;ctica, que participan activamente en los procesos inflamatorios y de reparaci&oacute;n tisular (62). Las quimiocinas se clasifican en cuatro subgrupos, CL (g), CCL (b), CXCL (a) y CX3CL (d), con base en la secuencia de amino&aacute;cidos y especialmente en la posici&oacute;n de los dos residuos de cisteina en el extremo amino terminal (63). </P>     <P>Algunos miembros de las quimiocinas CCL (RANTES, MIP-1a y MIP-1b) y las CXCL (SDF-1) juegan un papel crucial durante la patog&eacute;nesis de la infecci&oacute;n por el VIH-1 (64), dado que para entrar en la c&eacute;lula blanco el virus necesita no s&oacute;lo de su receptor, la mol&eacute;cula CD4, si no de un correceptor que corresponde a las mol&eacute;culas CCR5 o CXCR4, receptores fisiol&oacute;gicos de estas quimiocinas b y a, respectivamente (65). El mecanismo por el cual estas quimiocinas inhiben la infecci&oacute;n viral es el bloqueo del correceptor y por la regulaci&oacute;n negativa inducida por la uni&oacute;n de los respectivos ligandos (66). </P> <B>    ]]></body>
<body><![CDATA[<P>Factor 1 derivado del estroma (SDF-1)</P> </B>    <P>Esta a quimiocina, conocida actualmente como CXCL12, es el ligando natural de CXCR4, uno de los correceptores virales; es secretada por c&eacute;lulas estromales de m&eacute;dula &oacute;sea, c&eacute;lulas epiteliales, monocitos y por c&eacute;lulas T v&iacute;rgenes (64); tiene actividad quimiot&aacute;ctica principalmente sobre neutr&oacute;filos y linfocitos (67). Esta quimiocina es esencial para mantener la viabilidad del embri&oacute;n, para realizar una adecuada linfopoyesis de c&eacute;lulas B, la hematopoyesis de m&eacute;dula &oacute;sea y durante la cardiog&eacute;nesis (68).</P> <I>    <P>In vitro</I> esta citocina une y regula negativamente la expresi&oacute;n de CXCR4 en la membrana celular (69), inhibiendo la fusi&oacute;n y la entrada del virus, lo cual ha llevado a sugerir su papel protector <I>in vivo</I> durante la infecci&oacute;n por el VIH-1 (1).</P> <B><I>    <P>Evidencia epidemiol&oacute;gica</P> </B></I>    <P>Las c&eacute;lulas epiteliales de la mucosa rectal y cervicovaginal expresan constitutivamente altas concentraciones de CXL12 (SDF-1) y niveles f&aacute;cilmente detectables de RNAm que pueden bloquear la uni&oacute;n del virus al correceptor CXCR4, pero no a CCR5, lo que explicar&iacute;a parcialmente la mayor incidencia de transmisi&oacute;n de cepas R5 a trav&eacute;s del contacto sexual (70, 71) y el bajo riesgo de adquirir la infecci&oacute;n en un solo acto sexual (72). Un estudio reciente evalu&oacute; la concentraci&oacute;n de quimiocinas en la leche materna de madres VIH-1 positivas y madres control sanas, encontrando un incremento en la producci&oacute;n de CXCL12 (SDF-1) que se asoci&oacute; con un menor riesgo de transmisi&oacute;n vertical del VIH-1 (73).</P> <B>    <P>CCL5 (RANTES), CCL3 (MIP-1a) y CCL4 (MIP-1b)</P> </B>    <P>Son b quimiocinas producidas por c&eacute;lulas tanto de la inmunidad innata como adquirida: macr&oacute;fagos, c&eacute;lulas dendr&iacute;ticas, c&eacute;lulas NK, c&eacute;lulas T gd, y linfocitos T CD8+ (66). Son los ligandos naturales de CCR5, correceptor de cepas R5 del VIH-1, que corresponden a la forma de transmisi&oacute;n primaria del virus (66). Estas quimiocinas cumplen varias funciones biol&oacute;gicas; la principal es su actividad quimiot&aacute;ctica sobre linfocitos, mastocitos, eosin&oacute;filos y monocitos (67). Adicionalmente, estimulan la migraci&oacute;n transendotelial, la liberaci&oacute;n de elastasas por neutr&oacute;filos, de la ribonucleasa EDN por eosin&oacute;filos y de histamina por bas&oacute;filos; as&iacute; mismo, induce la polimerizaci&oacute;n de actina, incrementa el calcio intracelular y la actividad citot&oacute;xica de las c&eacute;lulas NK (67, 74).</P>     <P>La actividad anti-VIH de las b quimiocinas radica en bloquear la uni&oacute;n viral con el CCR5 y en regular negativamente la expresi&oacute;n de esta mol&eacute;cula en la superficie celular (20). <I>In vitro</I> se demostr&oacute; que a trav&eacute;s de estos mecanismos las CC quimiocinas inhiben la infecci&oacute;n, lo que se traduce en una menor tasa de replicaci&oacute;n viral (75). </P> <B><I>    <P>Evidencia epidemiol&oacute;gica</P> </B></I>    <P>La mayor&iacute;a de estudios en individuos adultos VIH-1 positivos sugieren que el aumento en los niveles de b quimiocinas retrasa el desarrollo del sida (76). En forma similar, en pacientes pedi&aacute;tricos tambi&eacute;n se ha observado una correlaci&oacute;n positiva entre los niveles de CC quimiocinas y una progresi&oacute;n lenta de la infecci&oacute;n por VIH-1 (77). Adicional-mente, estudios recientes demuestran que, comparadas con trabajadoras sexuales infectadas, las trabajadoras sexuales resistentes al VIH-1 expresan recuentos elevados de linfocitos T CD4+ y CD8+, as&iacute; como cantidades elevadas de RANTES en mucosa cervical (78). </P> <B>    ]]></body>
<body><![CDATA[<P>Interferones</B> </P>     <P>Los IFN se dividen en dos clases seg&uacute;n las c&eacute;lulas que los secretan: los IFN tipo I, que pueden ser a,b u w, secretados por cualquier c&eacute;lula nucleada infectada por virus y por las CD plasmacitoides en respuesta al reconocimiento de PAMP por varios receptores tipo Toll (TLR) (79), y el tipo II o IFN g, que es secretado por las c&eacute;lulas del sistema inmune (80). Existe solo un gen miembro de la familia de IFN-b o IFN-w, pero se han reportado un gran n&uacute;mero de genes para IFN-a (79). Los IFN tipo I poseen un receptor com&uacute;n, IFNAR (del ingl&eacute;s <I>IFN-a/b</I> <I>Receptor</I>) (22). A pesar de que la infecci&oacute;n viral es la causa biol&oacute;gica m&aacute;s com&uacute;n de inducci&oacute;n de IFN tipo I, otros agentes como bacterias, micoplasmas y protozoos, o algunos de sus componentes, pueden inducir su s&iacute;ntesis (81). </P> <B><I>    <P>Mecanismos inhibitorios</P> </B></I>    <P>Los IFN tipo I tienen diversas funciones inmunomoduladoras como la activaci&oacute;n de las c&eacute;lulas NK y NKT invariantes, la inducci&oacute;n de iNOS (del ingl&eacute;s <I>inducible nitric oxide synthase</I>) y de mol&eacute;culas del CMH-I y II que favorecen la presentaci&oacute;n antig&eacute;nica (82, 83). Los IFN tipo I suprimen la replicaci&oacute;n viral por varios mecanismos (82): inducen la expresi&oacute;n de prote&iacute;nas como la 2'-5' oligoadenilato sintasa y la RNasa L, las cuales degradan el ARN viral y celular; activan la prote&iacute;na cinasa dependiente de ARN de doble cadena (PKR) que inhibe la traducci&oacute;n del RNAm; estimulan la producci&oacute;n de la prote&iacute;na MxA, prote&iacute;na unidora de guanilato que inhibe la s&iacute;ntesis de ARN, e inducen la deaminasa adenosina espec&iacute;fica de ARN (ADAR) que edita el ARN. A trav&eacute;s de todas estas prote&iacute;nas impiden la diseminaci&oacute;n de la infecci&oacute;n (84). </P>     <P>Adicionalmente, los IFN tipo I regulan la producci&oacute;n de anticuerpos <I>in vivo</I> e <I>in vitro</I>, inhiben las c&eacute;lulas T supresoras/reguladoras, tienen actividad antitumoral (85, 86) y promueven la respuesta de citocinas del patr&oacute;n Th1 (84). </P>     <P>El IFN-a ha mostrado actividad anti-VIH <I>in vitro</I>, inhibiendo varios pasos del ciclo de vida del virus (66). Inicialmente se sugiri&oacute; que pod&iacute;a inhibir el ensamblaje viral (87) y reportes posteriores se&ntilde;alan su actividad sobre pasos previos a la transcripci&oacute;n reversa (88) y sobre la transcripci&oacute;n reversa, la expresi&oacute;n del provirus y la liberaci&oacute;n de viriones a partir de c&eacute;lulas infectadas cr&oacute;nicamente (22).</P> <B><I>    <P>Evidencias epidemiol&oacute;gicas</P> </B></I>    <P>Diferentes estudios cl&iacute;nicos se&ntilde;alan que la p&eacute;rdida de c&eacute;lulas productoras de IFN-a durante la infecci&oacute;n por el VIH-1 se asocia con altas cargas virales y con una r&aacute;pida progresi&oacute;n a sida (89). De otro lado, y en apoyo al papel antiviral de esta citocina, se ha descrito una mayor capacidad en la producci&oacute;n de IFN-a en individuos VIH-1 positivos que exhiben una progresi&oacute;n lenta de la infecci&oacute;n (22). En individuos SP tratados con terapia HAART (del ingl&eacute;s <I>Highly Active Antiretroviral Therapy</I>), la disminuci&oacute;n significativa de la carga viral se ha asociado con un aumento en el n&uacute;mero de c&eacute;lulas dendr&iacute;ticas plasmaci-toides productoras de IFN-a (90, 91). Otros estudios se&ntilde;alan que el uso de esta citocina en pacientes con sida y procesos oncog&eacute;nicos como el sarcoma de Kaposi disminuye la carga viral y potencia la respuesta antitumoral (92,93). Adicionalmente, se ha reportado que el uso de esta citocina mejora la actividad l&iacute;tica e incrementa las concentraciones de granzimas y perforinas en las c&eacute;lulas NK (94, 95) y potencia la respuesta de las c&eacute;lulas dendr&iacute;ticas plasmacitoides contra ant&iacute;genos virales (96). De los 21 subtipos de IFN-a descritos hasta el momento, el subtipo a2 se expresa en forma dominante (97), y probablemente sea el tipo de IFN responsable de la mayor&iacute;a de los efectos antivirales antes mencionados.</P>     <P>Con respecto al IFN-g, estudios en macacos infectados con el virus de la inmunodeficiencia simiana (SIV) sugieren que esta citocina disminuye la replicaci&oacute;n viral; adicionalmente, se ha encontrado una asociaci&oacute;n entre niveles altos de RNAm de IFN-g en MNSP, n&oacute;dulos linfoides y linfocitos de l&aacute;mina propia intestinal, y el control de la replicaci&oacute;n viral (22). A pesar de que la mayor&iacute;a de las evidencias respalda el papel antiviral del IFN-g, tambi&eacute;n se ha sugerido que esta citocina, conjuntamente con la IL-10, induce la replicaci&oacute;n viral durante la interacci&oacute;n entre CD y c&eacute;lulas T infectadas, favoreciendo la diseminaci&oacute;n de la infecci&oacute;n (98). </P> <B>    <P>Factor antiviral de linfocitos T CD8 (CAF)</P> </B>    ]]></body>
<body><![CDATA[<P>CAF es un factor soluble con actividad antiviral producido por los linfocitos T CD8+ en respuesta a la infecci&oacute;n por el VIH-1; no es citot&oacute;xico para c&eacute;lulas T CD4+ (21) y tiene la capacidad de inhibir la replicaci&oacute;n de cepas X4 y R5 del VIH-1 (66). Hasta el momento no est&aacute; claramente identificada la naturaleza del CAF, pero se sabe que el componente activo es estable al calor, resistente a altas temperaturas (86°C, 10 min), a pH &aacute;cido (hasta 2,0) y es resistente a la tripsina pero sensible a la proteasa V8 de <I>Staphylococcus</I> (99).</P>     <P>Esta actividad antiviral no citot&oacute;xica de los linfocitos T CD8+ se comprob&oacute; mediante el cocultivo de estas c&eacute;lulas con linfocitos T CD4+ infectados, separados f&iacute;sicamente mediante membranas semipermeables; en estos cultivos, la replicaci&oacute;n viral disminuy&oacute; significativamente y se mantuvo la viabilidad de las c&eacute;lulas T CD4+ (43, 66). Buscando determinar la o las mol&eacute;culas responsables de la actividad del CAF, diferentes estudios han sugerido la homolog&iacute;a entre el CAF y distintas mol&eacute;culas antivirales. Las b quimiocinas CCL5 (RANTES), CCL3 (MIP-1a) y CCL4 (MIP-1b) se han propuesto como las mol&eacute;culas responsables de la actividad anti-VIH-1 del CAF (20); sin embargo, la capacidad de inhibir cepas X4 y R5 exhibida por el CAF descarta la posibilidad de que estas prote&iacute;nas sean sus componentes activos, ya que las las b quimiocinas s&oacute;lo tienen capacidad de inhibir cepas R5 (20). Estudios recientes afirman que el componente activo del CAF corresponde a una forma modificada por proteasas celulares de la antitrombina III bovina (ATIII), presente en el suero fetal bovino utilizado en cultivos celulares en los cuales se ha reportado la actividad del CAF (100). Aunque estudios posteriores confirmaron la actividad antiviral de ATIII, se report&oacute; que la actividad del CAF se mantiene en condiciones libres de prote&iacute;nas del suero fetal bovino (101). Inicialmente, se postul&oacute; a las a defensinas como las mol&eacute;culas responsables de la actividad del CAF (102); sin embargo, los mismo autores se retractaron posteriormente de esta afirmaci&oacute;n (103). Adicionalmente, se determin&oacute; que las a defensinas ejercen su actividad antiviral en un paso del ciclo viral diferente a aquel en que act&uacute;a el CAF (39), y los anticuerpos contra las a defensinas fueron incapaces de bloquear la actividad anti-VIH-1 del CAF (43).</P>     <P>El CAF inhibe un paso de la transcripci&oacute;n viral conducido por el LTR (del ingl&eacute;s <I>Long-Terminal Repeat</I>) (104); se ha propuesto que esta inhibici&oacute;n involucra la uni&oacute;n de un ligando a un receptor en la superficie celular y la activaci&oacute;n de una v&iacute;a de transducci&oacute;n de se&ntilde;ales en la cual participan la prote&iacute;na STAT1 (del ingl&eacute;s <I>Signal Transducer and Activator of Transcription 1</I>) y los factores de transcripci&oacute;n nuclear NF-kB y NFAT (del ingl&eacute;s <I>Nuclear Factor of</I> <I>Activated T cells</I>), as&iacute; como el IRF-1 (del ingl&eacute;s <I>Interferon Regulatory Factor 1</I>) (105-107). Estudios recientes se&ntilde;alan que las c&eacute;lulas T CD8+ producen un precursor del CAF que necesita ser cortado por una proteasa celular para ser activo, ya que en presencia de inhibidores de proteasas como la leucopeptina se bloquea la actividad no citot&oacute;xica de los linfocitos T CD8+ (108). Se ha sugerido que este precursor es activo en la superficie celular, aunque no se descarta su entrada a la c&eacute;lula para generar el estado antiviral en las c&eacute;lulas T CD4+ (101).</P> <B><I>    <P>Evidencias epidemiol&oacute;gicas</P> </B></I>    <P>En 1986 se demostr&oacute; que individuos infectados con el VIH-1 eran capaces de controlar la infecci&oacute;n mediante una fuerte respuesta inmune celular (21, 101); estos estudios revelaron que las c&eacute;lulas T CD8+ ten&iacute;an la capacidad de inhibir la replicaci&oacute;n viral, sin necesidad de eliminar la c&eacute;lula infectada, por medio de un factor soluble que m&aacute;s tarde se conoci&oacute; como CAF (21). Estudios posteriores encontraron esta misma actividad en linfocitos T CD8+ de sangre perif&eacute;rica y de n&oacute;dulos linfoides en individuos VIH-1 positivos (109). Investiga-ciones recientes realizadas en individuos VIH-2 positivos demuestran que esta actividad antiviral no citot&oacute;xica se mantiene e inhibe de manera similar a cepas R5 de ambos virus, VIH-1 y 2, pero parece ser m&aacute;s fuerte para las cepas X4 del VIH-2 que del VIH-1 (110). Una de las mayores evidencias del papel antiviral del CAF fue hallar que la replicaci&oacute;n viral <I>in vitro</I> del VIH-1 en MNSP de individuos ESN era significativamente menor, y que dicho efecto antiviral estaba mediado por la actividad no citot&oacute;xica de los linfocitos T CD8+ (111). Adem&aacute;s, la actividad antiviral no citot&oacute;xica de los linfocitos T CD8+ en individuos SP se ha correlacionado negativamente con la progresi&oacute;n hacia el sida (112). </P> <B>    <P>RNasas</P> </B>    <P>Las ribonucleasas son enzimas reguladoras que participan en varios procesos fisiol&oacute;gicos, que van desde el procesamiento alternativo del ARN hasta la muerte celular (113). Son prote&iacute;nas expresadas por diferentes tejidos, que exhiben especificidades variables contra diferentes substratos de ARN; est&aacute;n compuestas de un p&eacute;ptido se&ntilde;al de aproximadamente 25 amino&aacute;cidos y un p&eacute;ptido maduro de 130 amino&aacute;cidos (114). Las ribonu-cleasas est&aacute;n divididas en tres grandes familias: la superfamilia A, la familia T1 y la familia T2. La superfamilia de ribonucleasas A incluye las 13 RNasas humanas hasta el momento descubiertas (114). El potencial terap&eacute;utico de las RNasas se ha sugerido en procesos oncog&eacute;nicos y en infecciones virales (115).</P> <B><I>    <P>Mecanismos inhibitorios</P> </B></I>    <P>Se ha postulado que las RNasas tienen actividad antiviral directa y, adem&aacute;s, se encontr&oacute;<I> </I>que algunas de ellas son capaces de estimular las c&eacute;lulas dendr&iacute;ticas para la producci&oacute;n de varios factores solubles e inducir su maduraci&oacute;n <I>in vitro</I> (116) potenciando la respuesta inmune contra diferentes pat&oacute;genos. Algunos autores proponen que las RNasas tienen la capacidad de unirse a la membrana celular, penetrar al interior de la c&eacute;lula utilizando ves&iacute;culas ac&iacute;dicas y degradar el RNA, causando la muerte celular (117, 118). La capacidad antiviral de las RNasas est&aacute; ampliamente reportada en la literatura: la RNasa 2 (EDN, neurotoxina derivada de eosin&oacute;filos) y la RNasa 3 (ECP, prote&iacute;na cati&oacute;nica derivada de eosin&oacute;filos) inhiben la replicaci&oacute;n del virus respiratorio sincitial y de otros paramixovirus (119). Tambi&eacute;n se ha encontrado que la EDN y otras RNasas inhiben la replicaci&oacute;n del VIH-1 en l&iacute;neas celulares cr&oacute;nicamente infectadas (120). Nuestro laboratorio, en colaboraci&oacute;n con el laboratorio de Gene Shearer en el NCI (National Cancer Institutes, Nacional Institutes of Health, Estados Unidos), encontr&oacute; que la EDN es la mol&eacute;cula responsable de la actividad anti-VIH-1 de un factor soluble que se produce en respuesta a los aloant&iacute;genos (ASF), el cual se obtiene <I>in vitro</I> durante el cultivo mixto de linfocitos (26) y cuya actividad supresora parece darse sobre un paso previo a la transcripci&oacute;n reversa (121). El uso de un conjugado de RNasa pancre&aacute;tica y alb&uacute;mina de suero humano inyectado en ratones infectados con virus influenza A e influenza B mostr&oacute; alta actividad antiviral (122). Nosotros tambi&eacute;n observamos recientemente que cuatro RNasas recombinantes inhiben la replicaci&oacute;n del VIH-1 en un cultivo primario de linfocitos T activados (Bedoya VI BA, Hardy A, Rybak SM, Shearer GM, Rugeles MT. Ribonucleases in HIV- 1 inhibition: effect of recombinant RNases on infection of primary T cells and immune activation-induced RNase gene and protein expression. AIDS Res Hum Retroviruses 2006;in press), lo que refuerza el potencial antiviral de estas enzimas.</P> <B>    <P>Inhibidor de proteasas secretado por leucocitos (SLPI)</P> </B>    ]]></body>
<body><![CDATA[<P>SLPI es una prote&iacute;na de 11,7 kDa, no-glicosilada, altamente b&aacute;sica y estable en medio &aacute;cido (123), lo que le permite ser funcional en ambientes como el de las mucosas (29). Fue originalmente caracterizada en par&oacute;tidas humanas (124) y es secretada por c&eacute;lulas epiteliales no ciliadas que recubren las superficies mucosas (123), por la piel (125), por neutr&oacute;filos (126) y por macr&oacute;fagos estimulados con LPS (127). El blanco fisiol&oacute;gico de SLPI son las proteasas que act&uacute;an sobre residuos de serina, como la elastasa del neutr&oacute;filo y la catepsina G liberadas durante la respuesta inflamatoria (128). De esta manera, SLPI contribuye en la defensa de las mucosas mediante la regulaci&oacute;n de la inflamaci&oacute;n (129). Adem&aacute;s, posee una amplia actividad antimicrobiana inhibiendo bacterias, hongos y virus (130). Otras funciones incluyen la promoci&oacute;n de la fecundaci&oacute;n protegiendo a los espermatozoides para que no sufran la reacci&oacute;n acrosomal por la acci&oacute;n de las elastasas (131) y la reparaci&oacute;n tisular en la piel (132). </P> <B><I>    <P>Mecanismos inhibitorios</P> </B></I>    <P>McNeely y colaboradores reportaron la primera actividad inhibitoria de la SLPI, recombinante o derivada de saliva, contra diferentes cepas del VIH-1 en monocitos humanos, en cultivo primario de linfocitos y en l&iacute;neas de c&eacute;lulas T transformadas (133,134). En estos estudios se observ&oacute; que el efecto inhibitorio se produce en las etapas tempranas de la infecci&oacute;n, ya que la SLPI inhibi&oacute; la replicaci&oacute;n viral s&oacute;lo cuando se adicion&oacute; simult&aacute;neamente con el virus al cultivo de c&eacute;lulas (133). Estudios posteriores se&ntilde;alan que la SLPI no afecta la uni&oacute;n del viri&oacute;n a la mol&eacute;cula CD4, ni los pasos posteriores a la transcripci&oacute;n reversa (29,134), lo que sugiere que su actividad se da en un paso intermedio (134). Investigaciones recientes demuestran que el efecto inhibidor de la la SLPI se da por medio de la interacci&oacute;n de alta afinidad con una mol&eacute;cula de superficie celular conocida como anexina II; esta uni&oacute;n no permite la interacci&oacute;n de residuos de fosfatidilserina presentes en la envoltura viral con la prote&iacute;na unidora anexina II en la membrana celular de macr&oacute;fagos susceptibles (135). Existen evidencias que indican que el VIH-1 induce la producci&oacute;n de RNAm y prote&iacute;na de la SLPI en queratinocitos orales humanos inmortalizados por medio de la interacci&oacute;n con gp120 en ausencia de infecci&oacute;n (136). </P> <B><I>    <P>Evidencias epidemiol&oacute;gicas </P> </B></I>    <P>Investigaciones de Pillay y colaboradores se&ntilde;alan que madres VIH-1 positivas que no transmitieron el virus a sus hijos expresaban mayores cantida-des de la prote&iacute;na SLPI en fluidos vaginales que las madres VIH-1 positivas transmisoras (137). Farquhar y colaboradores evaluaron el papel de la SLPI en la transmisi&oacute;n del VIH-1 a trav&eacute;s de la leche materna, encontrando mayores niveles de SLPI en la saliva de beb&eacute;s que recibieron alimentaci&oacute;n materna y no fueron infectados que en los beb&eacute;s que adquirieron la infecci&oacute;n (138). Otros estudios evaluaron la expresi&oacute;n de la SLPI en saliva de par&oacute;tida, gl&aacute;ndula sublingual y submandibular de individuos SP y controles sanos, encontrando una mayor expresi&oacute;n de la SLPI en la saliva de individuos SP; adicionalmente, los individuos SP que recib&iacute;an terapia HAART presentaban un aumento en los niveles de SLPI comparados con individuos sin tratamiento, lo que podr&iacute;a reducir el riesgo de transmisi&oacute;n oral del VIH-1 (130). </P> <B>    <P>Conclusiones </P> </B>    <P>Los elementos claves para resistir a la infecci&oacute;n por el VIH y al progreso posterior hacia sida residen principalmente en el sistema inmune del hospedero. Tanto el sistema inmune innato como el adaptativo participan en forma coordinada en la respuesta a los procesos infecciosos por medio de componen-tes celulares y de factores solubles con actividad microbicida. Diversos factores solubles se han postulado como elementos importantes de la respuesta antiviral. Estos factores ejercen su actividad por medio de mecanismos no citol&iacute;ticos, lo que los hace un blanco importante de investigaci&oacute;n y destaca su potencial terap&eacute;utico, particularmente como complemento de la terapia antirretroviral actualmente en uso. Aunque se ha comprobado la actividad antiviral <I>in vitro</I> de estos factores solubles y existe evidencia epidemiol&oacute;-gica que respalda su papel protector <I>in vivo</I> durante la infecci&oacute;n por VIH-1, hasta el momento no se tiene claramente identificado el mecanismo exacto por medio del cual muchos de estos factores ejercen su acci&oacute;n antiviral. Tampoco existen estudios controlados y en modelos animales que eval&uacute;en su actividad <I>in vivo,</I> y que permitan establecer las condiciones &oacute;ptimas para su uso terap&eacute;utico. La intensa investigaci&oacute;n en esta &aacute;rea muy posiblemente lograr&aacute; la identificaci&oacute;n de nuevos factores solubles con actividad anti-VIH-1 y sus mecanismos de acci&oacute;n, lo que permitir&aacute; establecer nuevas estrategias terap&eacute;uticas para pacientes VIH-1 positivos.</P> <B>    <P>Agradecimientos</P> </B>    <P>Al Comit&eacute; para el Desarrollo de la Investigaci&oacute;n (CODI) de la Universidad de Antioquia por su apoyo econ&oacute;mico; al personal de salud de la Instituci&oacute;n Prestadora de Salud (IPS), HERES Salud, Empresa Unipersonal de la ciudad de Santa Marta, por su participaci&oacute;n y colaboraci&oacute;n, y al estudiante de medicina de la Universidad de Antioquia Mario Archila Duarte por el dise&ntilde;o de la figura.</P> <B>    <P>Conflicto de intereses</P> </B>    ]]></body>
<body><![CDATA[<P>Las autores de esta revisi&oacute;n manifestamos que no existe ning&uacute;n conflicto de intereses en la realizaci&oacute;n de este trabajo.</P> <B>    <P>Financiaci&oacute;n</P> </B>    <P>Este trabajo fue financiado por el Comit&eacute; para el Desarrollo de la Investigaci&oacute;n (CODI) de la Universidad de Antioquia.</P> </FONT><FONT FACE="Arial" SIZE=1>    <P>Correspondencia:</P>     <P>Mar&iacute;a Teresa Rugeles, Grupo de Inmunovirologia-Biog&eacute;nesis, Facultad de Medicina, Universidad de Antioquia, Calle 62 # 52-59, Laboratorio 532, Medell&iacute;n, Colombia.</P>     <P>Tel&eacute;fono: (4) 2106551, fax: (4) 2106481.</P> </FONT>    <P><A HREF="mailto:mtrugel@catios.udea.edu.co">mtrugel@catios.udea.edu.co</A></P> <FONT FACE="Arial" SIZE=1>    <P>Recibido: 28/03/06; aceptado: 16/08/06</P> </FONT><B><FONT FACE="Arial">    <P>Referencias</P> </B>    <!-- ref --><P>1.&#9;<B>Dybul M, Connors M, Fauci AS.</B> Immunology of HIV infection. In: Paul WE, editor. 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