<?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>0864-0289</journal-id>
<journal-title><![CDATA[Revista Cubana de Hematología, Inmunología y Hemoterapia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Hematol Inmunol Hemoter]]></abbrev-journal-title>
<issn>0864-0289</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-02892009000200002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[HLA-G:: ¿molécula inductora de inmunotolerancia?]]></article-title>
<article-title xml:lang="en"><![CDATA[HLA-G molecule as inductor of immunotolerance]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alfonso Valdés]]></surname>
<given-names><![CDATA[Dra. María E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto de Hematología e Inmunología  ]]></institution>
<addr-line><![CDATA[Ciudad de La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2009</year>
</pub-date>
<volume>25</volume>
<numero>2</numero>
<fpage>8</fpage>
<lpage>17</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-02892009000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-02892009000200002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-02892009000200002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las moléculas HLA-G son antígenos HLA de clase I "no clásicos" del sistema principal de histocompatibilidad. Existen 6 isoformas del gen HLA-G que codifican 4 proteínas unidas a membrana (HLA-G1, HLA-G2, HLA-G3, HLA-G4) y 3 isoformas solubles (HLA-G5, HLA-G6, HLA-G7). Las primeras se expresan en células del citrofoblasto extravelloso de la placenta, células epiteliales del amnio, células endoteliales fetales, macrófagos del mesénquima de las vellosidades coriónicas y en las células epiteliales de la médula del timo; las segundas en el líquido amniótico, en la sangre periférica materna y en la de cordón. Se ha observado expresión HLA-G en varios tipos de tumores, células de estroma durante condiciones de inflamación, células infectadas por virus y en el suero de pacientes trasplantados. Existen fuertes evidencias del papel de las moléculas HLA-G en la inducción de tolerancia en estas situaciones fisiológicas y patológicas, a través de la supresión de la actividad lítica de las células NK y los linfocitos T citotóxicos. Este conocimiento puede ser de gran utilidad en el manejo terapéutico futuro de estas entidades, así como para favorecer el éxito del trasplante de órganos y tejidos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[HLA-G are molecules are «non-classic» class I antigens from main histocompatibility system. There are sis isoforms of HLA-G antigen codifying four proteins united to a membrane (HLA-G1, HLA-G2, HLA-G3, HLA-G4), and three soluble isoforms (HLA-G5, HLA-G6, HLA-G7). The first ones are expressed in cells of placental extravillous cytotrophoblast (Langhans' layer), amnios epithelial cells, fetal endothelial cells, mesenchymal macrophages of chorionic villi, and in epithelial cells of thymus medulla; the second ones in amniotic fluid, in maternal peripheral blood and that of the umbilical cord. There was a HLA-G expression in some types of tumors, stroma cells under inflammation conditions, virus-infected cells and in serum of transplant patients. There are strong evidences of HLA-G molecules role in tolerance induction to these physiological and pathological situations through suppression of lithic activity of NK cells and of cytotoxic T lymphocytes. This knowledge may be very useful in future therapeutical management of these entities as well as to favor the success of tissue and organ transplant.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[HLA-G]]></kwd>
<kwd lng="es"><![CDATA[sistema principal de histocompatibilidad]]></kwd>
<kwd lng="es"><![CDATA[tolerancia]]></kwd>
<kwd lng="es"><![CDATA[interfase feto-materna]]></kwd>
<kwd lng="es"><![CDATA[embarazo]]></kwd>
<kwd lng="es"><![CDATA[trofoblasto]]></kwd>
<kwd lng="en"><![CDATA[HLA-G]]></kwd>
<kwd lng="en"><![CDATA[main histocompatibility system]]></kwd>
<kwd lng="en"><![CDATA[tolerance]]></kwd>
<kwd lng="en"><![CDATA[fetus-mother interface]]></kwd>
<kwd lng="en"><![CDATA[pregnancy]]></kwd>
<kwd lng="en"><![CDATA[trophoblast]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <P align="right"><font face="Verdana" size="2"><B>ART&Iacute;CULO DE REVISI&Oacute;N </B></font> <B>     <P>      <P>  </B>     <P><b><font face="Verdana" size="4">HLA-G: &#191;mol&eacute;cula inductora de    inmunotolerancia? </font> </b>     <P> <B>    <P>      <P><font face="Verdana" size="3">HLA-G molecule as inductor of immunotolerance</font>      <P>      <P>      <P>      ]]></body>
<body><![CDATA[<P>      <P>      <P>      <P>      <P><font face="Verdana" size="2">Dra. Mar&iacute;a E. Alfonso Vald&eacute;s</font> </B>      <P>      <P>      <P><font face="Verdana" size="2">Instituto de Hematolog&iacute;a    e Inmunolog&iacute;a. Ciudad de La Habana, Cuba. </font>     <P>     <P>     ]]></body>
<body><![CDATA[<P>     <P>    <br> <hr size="1" noshade>     <P>      <P>      <P>      <P><font face="Verdana" size="2"><B>RESUMEN</B> </font>     <P><font face="Verdana" size="2">Las mol&eacute;culas HLA-G son ant&iacute;genos    HLA de clase I &quot;no cl&aacute;sicos&quot; del sistema principal de histocompatibilidad.    Existen 6 isoformas del gen HLA-G que codifican 4 prote&iacute;nas unidas a    membrana (HLA-G1, HLA-G2, HLA-G3, HLA-G4) y 3 isoformas solubles (HLA-G5, HLA-G6,    HLA-G7). Las primeras se expresan en c&eacute;lulas del citrofoblasto extravelloso    de la placenta, c&eacute;lulas epiteliales del amnio<FONT  COLOR="#0000ff">,</FONT> c&eacute;lulas endoteliales fetales, macr&oacute;fagos    del mes&eacute;nquima de las vellosidades cori&oacute;nicas y en las c&eacute;lulas    epiteliales de la m&eacute;dula del timo; las segundas en el l&iacute;quido    amni&oacute;tico, en la sangre perif&eacute;rica materna y en la de cord&oacute;n.    Se ha observado expresi&oacute;n HLA-G en varios tipos de tumores, c&eacute;lulas    de estroma durante condiciones de inflamaci&oacute;n, c&eacute;lulas infectadas    por virus y en el suero de pacientes trasplantados. Existen fuertes evidencias    del papel de las mol&eacute;culas HLA-G en la inducci&oacute;n de tolerancia    en estas situaciones fisiol&oacute;gicas y patol&oacute;gicas, a trav&eacute;s    de la supresi&oacute;n de la actividad l&iacute;tica de las c&eacute;lulas NK    y los linfocitos T citot&oacute;xicos. Este conocimiento puede ser de gran utilidad    en el manejo terap&eacute;utico futuro de estas entidades, as&iacute; como para    favorecer el &eacute;xito del trasplante de &oacute;rganos y tejidos. </font>     <P><font face="Verdana" size="2"><I>Palabras clave</I>: HLA-G, sistema principal    de histocompatibilidad, tolerancia, interfase feto-materna, embarazo, trofoblasto.    </font> <hr size="1" noshade>     <P><font face="Verdana" size="2"><b>ABSTRACT</b></font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">HLA-G are molecules are &#171;non-classic&#187;    class I antigens from main histocompatibility system. There are sis isoforms    of HLA-G antigen codifying four proteins united to a membrane (HLA-G1, HLA-G2,    HLA-G3, HLA-G4), and three soluble isoforms (HLA-G5, HLA-G6, HLA-G7). The first    ones are expressed in cells of placental extravillous cytotrophoblast (Langhans'    layer), amnios epithelial cells, fetal endothelial cells, mesenchymal macrophages    of chorionic villi, and in epithelial cells of thymus medulla; the second ones    in amniotic fluid, in maternal peripheral blood and that of the umbilical cord.    There was a HLA-G expression in some types of tumors, stroma cells under inflammation    conditions, virus-infected cells and in serum of transplant patients. There    are strong evidences of HLA-G molecules role in tolerance induction to these    physiological and pathological situations through suppression of lithic activity    of NK cells and of cytotoxic T lymphocytes. This knowledge may be very useful    in future therapeutical management of these entities as well as to favor the    success of tissue and organ transplant. </font>     <P><font face="Verdana" size="2"><i>Key words:</i> HLA-G, main histocompatibility    system, tolerance, fetus-mother interface, pregnancy, trophoblast.     <br>   </font> <hr size="1" noshade>     <P>     <P><font face="Verdana" size="2"> </font>      <P>     <P><font face="Verdana" size="2"><B><font size="3">INTRODUCCI&Oacute;N</font></B>    </font>     <P>      <P><font face="Verdana" size="2">El sistema principal de histocompatibilidad (SPH)    humano se localiza en el brazo corto del cromosoma 6 y codifica al menos 130    genes funcionales, de los cuales los m&aacute;s estudiados son los genes denominados    &quot;cl&aacute;sicos&quot;, de clase I (HLA-A, -B y C) y de clase II (HLA-    DR, -DP, DQ). Ambas clases desempe&ntilde;an un papel relevante en la respuesta    inmune fisiol&oacute;gica, en las enfermedades autoinmunes y en el trasplante    de &oacute;rganos y tejidos. </font>     <P><font face="Verdana" size="2">Los ant&iacute;genos HLA de clase I cl&aacute;sicos    son altamente polim&oacute;rficos y se expresan pr&aacute;cticamente en todos    los tejidos conocidos. En la d&eacute;cada de los 80, se describieron los ant&iacute;genos    HLA de clase I &quot;no cl&aacute;sicos&quot; o Ib, que incluyen las mol&eacute;culas    HLA-E, -F y -G. Estos &uacute;ltimos son poco polim&oacute;rficos y se expresan    de forma selectiva en sitios inmunol&oacute;gicamente privilegiados como la    placenta y el timo. <SUP>1-3</SUP> </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Algunas investigaciones evidencian que el HLA-G    participa en la supresi&oacute;n de la respuesta inmune alog&eacute;nica durante    el embarazo y puede contribuir a los mecanismos de escape de los tumores y agentes    infecciosos. <SUP>4-6</SUP> </font>     <P><font face="Verdana" size="2">En esta revisi&oacute;n se consideran algunos    aspectos de la estructura y distribuci&oacute;n del HLA-G, as&iacute; como sus    acciones sobre el sistema inmune e importancia cl&iacute;nica. </font>     <P>      <P>      <P>     <p><font face="Verdana" size="2"><B><font size="3">ESTRUCTURA </font></B></font><font size="3"> </font></p>     <P><font face="Verdana" size="2">El gen HLA-G, descrito por primera vez por <I>Geraghty</I>    <SUP>3</SUP> en 1987 como HLA-6.0, se localiza en la regi&oacute;n telom&eacute;rica    6p21.3, muy cerca del <I>locus</I> del HLA-A. <SUP>7</SUP> Los genes HLA-E y    HLA-F est&aacute;n localizados entre los <I>locus</I> HLA-C y HLA-A y cerca    del HLA-G, respectivamente. <SUP>8,9</SUP> </font>     <P><font face="Verdana" size="2">La secuencia y estructura del gen HLA-G muestra    gran homolog&iacute;a con la de los genes HLA clase I cl&aacute;sicos: tiene    8 exones, 7 intrones y la regi&oacute;n 3'UTR, pero a diferencia de aquellos,    el HLA-G presenta un codon de parada en el ex&oacute;n 6 <SUP>1,3,10</SUP> y    muestra un bajo polimorfismo, con una limitada heterogeneidad de secuencias    y pocos alelos. <SUP>7,11-13</SUP> </font>     <P><font face="Verdana" size="2">El Comit&eacute; de Nomenclatura de Factores    del Sistema HLA, de la Organizaci&oacute;n Mundial de la Salud (OMS) reconoce    15 alelos del HLA-G, a nivel de nucle&oacute;tido. <SUP>14</SUP> El primer alelo    descrito por <I>Geraghty</I>, <SUP>3</SUP> el G*01011 (salvaje) se encuentra    presente en casi todas las poblaciones, aunque con una frecuencia variable.    <SUP>15</SUP> </font>     <P><font face="Verdana" size="2">Se han descrito 4 isoformas del gen HLA-G que    codifican 4 prote&iacute;nas truncadas unidas con membrana (HLA-G1, HLA-G2,    HLA-G3, HLA-G4) y 3 isoformas adicionales solubles (HLA-G5, HLA-G6, HLA-G7).    <SUP>9,11,16</SUP> Todas las isoformas del HLA-G tienen en com&uacute;n la presencia    del dominio </font><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><FONT FACE=Symbol>a</FONT></FONT><font face="Verdana" size="2">1 en la regi&oacute;n extracelular. <SUP>17</SUP> </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">La mol&eacute;cula de HLA-G tiene una estructura    cl&aacute;sica de mol&eacute;cula HLA de clase I con 3 dominios: </font><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><FONT FACE=Symbol>a</FONT></FONT><font face="Verdana" size="2">1,    </font><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><FONT FACE=Symbol>a</FONT></FONT><font face="Verdana" size="2">2 y </font><FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="2"><FONT FACE=Symbol>a</FONT></FONT><font face="Verdana" size="2">3, asociados covalentemente con la </font><font size="2" face="Symbol">b</font><font face="Verdana" size="2"> microglobulina.    Las mol&eacute;culas HLA-G interact&uacute;an con la mol&eacute;cula CD8. <SUP>1</SUP>    </font>     <P>      <P>      <P><font face="Verdana" size="3"><B>DISTRIBUCI&Oacute;N</B> </font>     <P>      <P><font face="Verdana" size="2">La prote&iacute;na HLA-G unida a membrana se    expresa selectivamente en las c&eacute;lulas del citrofoblasto extravelloso    de la placenta, las c&eacute;lulas epiteliales del ammnio, las c&eacute;lulas    endoteliales fetales, los macr&oacute;fagos del mes&eacute;nquima de las vellosidades    cori&oacute;nicas y las c&eacute;lulas epiteliales de la m&eacute;dula del timo.    Sin embargo, se han detectado niveles bajos de transcripci&oacute;n de los genes    HLA-G en algunas c&eacute;lulas de tejidos adultos, como linfocitos T y B. Por    otra parte, se ha observado expresi&oacute;n de ARN mensajero del HLA-G en sitios    como la regi&oacute;n anterior del ojo, la piel, los pulmones y en c&eacute;lulas    renales, de ovario, colon e intestino. <SUP>5,18-20</SUP> </font>     <P><font face="Verdana" size="2">Las formas solubles del HLA-G se encuentran en    el l&iacute;quido amni&oacute;tico, en la sangre perif&eacute;rica materna y    en la de cord&oacute;n. <SUP>21</SUP> </font>     <P><font face="Verdana" size="2">Tambi&eacute;n expresan HLA-G unido con la membrana    las c&eacute;lulas del trofoblasto endovascular.<SUP>22 </SUP>El sincitiotrofoblasto    solo expresa HLA-G soluble. <SUP>5,18</SUP> </font>     <P><font face="Verdana" size="2">Las mol&eacute;culas HLA-G pueden expresarse    ocasionalmente en fibras musculares y en c&eacute;lulas epiteliales del h&iacute;gado    y los t&uacute;bulos renales. <SUP>23-25</SUP>. </font>     <P><font face="Verdana" size="2">Se ha detectado expresi&oacute;n HLA-G en c&eacute;lulas    de estroma durante condiciones de inflamaci&oacute;n, <SUP>26</SUP> en biopsias    de tumores <SUP>27</SUP> y en suero de pacientes trasplantados. <SUP>28</SUP>    Estas 2 &uacute;ltimas localizaciones han provocado que varios investigadores    consideren que estas mol&eacute;culas participan en la producci&oacute;n de    tolerancia inmune a tumores y trasplantes <SUP>11, 29</SUP> </font>     ]]></body>
<body><![CDATA[<P>      <P>      <P><font face="Verdana" size="3"><B>ACCIONES DEL HLA-G SOBRE EL SISTEMA INMUNE</B>    </font>     <P>      <P><font face="Verdana" size="2">Existen numerosas evidencias de que el HLA-G    ejerce un efecto inhibitorio sobre la actividad de los linfocitos T citot&oacute;xicos    y las c&eacute;lulas NK. <SUP>30-33</SUP> </font>     <P>      <P>      <P><font face="Verdana" size="2"><B>Interacci&oacute;n del HLA-G con las NK</B>    </font>     <P>      <P><font face="Verdana" size="2">El HLA-G inhibe la cit&oacute;lisis mediada por    c&eacute;lulas NK a trav&eacute;s de una v&iacute;a directa y otra indirecta.    </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">- <I>Via directa</I>: las mol&eacute;culas HLA-G    ejercen su efecto sobre la actividad de las c&eacute;lulas NK a trav&eacute;s    de la interacci&oacute;n directa con receptores inhibitorios de estas c&eacute;lulas    (KIRs). Estos receptores son el ILT2/LIR1 (presente en c&eacute;lulas NK, c&eacute;lulas    mielomonoc&iacute;ticas, linfocitos T y B), ILT/LIR2 (expresado selectivamente    en monocitos, macr&oacute;fagos y c&eacute;lulas dendr&iacute;ticas), p49 (presente    en c&eacute;lulas NK deciduales) y KIR2DL4 (expresado en NK y linfocitos T).    Los receptores ILT2, ILT4 y p49 tambi&eacute;n pueden interactuar con otras    mol&eacute;culas clase I del HLA.<SUP>11,13,34)</SUP> </font>     <P><font face="Verdana" size="2">- <I>Via indirecta</I>: las mol&eacute;culas    HLA-G provocan una inhibici&oacute;n de la actividad citol&iacute;tica de las    c&eacute;lulas NK a trav&eacute;s de su interacci&oacute;n con el receptor CD94/NKG2    del HLA-E, presente en estas c&eacute;lulas. El receptor CD94/NKG2 es un miembro    de la superfamilia de la lectina C. <SUP>11,34,35</SUP> </font>     <P>      <P>      <P><font face="Verdana" size="2"><B>Interacciones del HLA-G con las c&eacute;lulas    T</B> </font>     <P>      <P><font face="Verdana" size="2">En 1999, <I>Le Gal</I> y colaboradores <SUP>33</SUP>    detectaron el efecto inhibitorio del HLA-G sobre la actividad de los linfocitos    T citot&oacute;xicos, mientras que otros autores se&ntilde;alan su papel en    la activaci&oacute;n de los linfocitos T supresores CD 8+.<SUP>11,26</SUP> </font>     <P><font face="Verdana" size="2">Las formas solubles del HLA-G pueden adem&aacute;s    inducir apoptosis de c&eacute;lulas T CD8+, a trav&eacute;s de la v&iacute;a    Fas/FasL. <SUP>36,37</SUP> </font>     <P><font face="Verdana" size="2">Las c&eacute;lulas presentadoras de ant&iacute;genos    transfectadas con HLA-G pueden prevenir la proliferaci&oacute;n de c&eacute;lulas    T CD4+. <SUP>6</SUP> </font>     <P>      ]]></body>
<body><![CDATA[<P>      <P> <font face="Verdana" size="3"><B>IMPORTANCIA CL&Iacute;NICA </B></font>     <P>    <br> <B>     <P>      <P><font face="Verdana" size="2">En el embarazo </font> </B>      <P>      <P><font face="Verdana" size="2">Las c&eacute;lulas del trofoblasto humano no    expresan las mol&eacute;culas cl&aacute;sicas del SPH clase I ni II, con la    excepci&oacute;n de una d&eacute;bil expresi&oacute;n de HLA-C. <SUP>2,38-40</SUP>    Las c&eacute;lulas que no expresan mol&eacute;culas HLA del SPH en su superficie    suelen sufrir lisis mediada por c&eacute;lulas NK, lo que no ocurre con las    c&eacute;lulas del trofoblasto. Al parecer, la fuerte expresi&oacute;n de mol&eacute;culas    HLA-G en las c&eacute;lulas del citotrofoblasto, conjuntamente con la expresi&oacute;n    de HLA-E y HLA-F en la placenta, previene esta destrucci&oacute;n. <SUP>10</SUP>    Algunos autores plantean que el mecanismo protector de estas 3 mol&eacute;culas,    es sin&eacute;rgico. <SUP>5</SUP> </font>     <P><font face="Verdana" size="2">La expresi&oacute;n de las mol&eacute;culas HLA-G    en las c&eacute;lulas del trofoblasto se inicia en una etapa temprana del primer    trimestre y se mantiene durante todo el embarazo. Algunos autores afirman que    puede estar presente en una etapa tan temprana como el estadio de blastocisto.    La mayor expresi&oacute;n se observa en el citotrofoblasto extravelloso. <SUP>13,18,41,42</SUP>    </font>     <P><font face="Verdana" size="2">Las acciones de las mol&eacute;culas HLA-G sobre    el sistema inmune y su fuerte expresi&oacute;n en el trofoblasto, sugieren que    estas mol&eacute;culas contribuyen a la protecci&oacute;n del feto semialog&eacute;nico    contra la lisis de las c&eacute;lulas NK y los linfocitos T citot&oacute;xicos    maternos. <SUP>1,11,26,43</SUP> Algunos estudios sugieren que las mol&eacute;culas    HLA-G de la placenta pueden contribuir a la eliminaci&oacute;n de c&eacute;lulas    T maternas CD8+ alorreactivas en la interfase feto-materna a trav&eacute;s de    la v&iacute;a CD95/CD95L. <SUP>15</SUP> </font>     ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">El embarazo exitoso se describe como un &quot;fen&oacute;meno    TH2&quot; caracterizado por la producci&oacute;n de las citocinas de ese perfil,    IL-10, IL-3, IL-4. Se ha demostrado que la IL-10 es capaz de activar la expresi&oacute;n    de HLA-G. <SUP>44</SUP> </font>     <P><font face="Verdana" size="2">En contraposici&oacute;n, algunas complicaciones    del embarazo, tales como el aborto espont&aacute;neo y la pre-eclampsia, se    asocian con una respuesta TH1, con producci&oacute;n de interleucina 2 (IL-2),    factor de necrosis tumoral (FNT) e interfer&oacute;n (IFN).<SUP>45</SUP> Por    otra parte, la presencia de HLA-G asociada con membrana o soluble, parece inducir    cambios en la secreci&oacute;n de citocinas por las c&eacute;lulas mononucleares    perif&eacute;ricas hacia el patr&oacute;n TH2. <SUP>46,47</SUP> </font>     <P><font face="Verdana" size="2">Se han observado patrones de expresi&oacute;n    de HLA-G aberrantes o disminuidos en el aborto espont&aacute;neo, el fallo de    la implantaci&oacute;n en la fertilizaci&oacute;n <I>in vitro</I>, y la pre-eclampsia.    <SUP>9</SUP> </font>     <P><font face="Verdana" size="2">En el 2001, <I>Pfeiffer</I><FONT  COLOR="#33cccc"> </FONT>y colaboradores encontraron un aumento de la frecuencia    de los alelos del HLA-G*01013 y HLA-G*0105N en 78 parejas con aborto recurrente    en comparaci&oacute;n con 52 controles. <SUP>48</SUP> </font>     <P><font face="Verdana" size="2">Otros investigadores han encontrado asociaci&oacute;n    entre el riesgo de aborto espont&aacute;neo despu&eacute;s de fertilizaci&oacute;n    <I>in vitro</I>, con los niveles de HLA-G soluble materno. En un estudio realizado    en 20 mujeres con abortos tempranos, los niveles s&eacute;ricos de HLA-G soluble    en las primeras 9 semanas de gestaci&oacute;n, fueron significativamente bajos    en comparaci&oacute;n con los de 37 mujeres con embarazos no complicados. <SUP>49</SUP>    </font>     <P><font face="Verdana" size="2"><I>Yie </I><SUP>50</SUP> encontr&oacute; niveles    significativamente reducidos de HLA-G soluble en el suero materno de mujeres    con pre-eclampsia en comparaci&oacute;n con los controles. <SUP>51</SUP> </font>     <P>      <P>      <P><font face="Verdana" size="2"><B>En los tumores </B> </font>     <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Los ant&iacute;genos HLA clase I del SMH desempe&ntilde;an    un papel esencial en el reconocimiento de las c&eacute;lulas malignas por las    del sistema inmune, entre ellas, las c&eacute;lulas efectoras NK y los linfocitos    T que infiltran el sitio del tumor. Se han detectado isoformas del HLA-G en    biopsias obtenidas de melanomas primarios y metast&aacute;sicos <SUP>52</SUP>    y se ha demostrado que el HLA-G inhibe la cit&oacute;lisis de las NK <I>in vitro    </I>en las l&iacute;neas celulares de melanoma.<SUP>27,52</SUP> El HLA-G podr&iacute;a    favorecer el escape a la inmunovigilancia de las c&eacute;lulas tumorales.<SUP>15</SUP>    </font>     <P>      <P>      <P><font face="Verdana" size="2"><B>En las infecciones</B> </font>     <P>      <P><font face="Verdana" size="2"><I>Onno</I> y colaboradores observaron ant&iacute;genos    HLA- G en macr&oacute;fagos durante la reactivaci&oacute;n v&iacute;rica por    CMV, por lo que sugieren que la inducci&oacute;n de la expresi&oacute;n de las    mol&eacute;culas HLA-G puede ser uno de los mecanismos empleados por el CMV    para subvertir las defensas del hu&eacute;sped. <SUP>53</SUP> </font>     <P>      <P>      <P><font face="Verdana" size="2"><B>En los trasplantes </B> </font>     <P>      ]]></body>
<body><![CDATA[<P><font face="Verdana" size="2">Se ha asociado la expresi&oacute;n de HLA-G soluble    en la sangre de receptores de trasplantes de coraz&oacute;n, h&iacute;gado y    ri&ntilde;&oacute;n, con un mejor pron&oacute;stico y una reducci&oacute;n de    los episodios de rechazo.<SUP>23,28,54</SUP> La modulaci&oacute;n de la respuesta    de las c&eacute;lulas T por el HLA-G puede contribuir a evitar el rechazo de    trasplantes. <SUP>11,26,36</SUP> </font>     <P><font face="Verdana" size="2">Tambi&eacute;n se ha descrito expresi&oacute;n    del HLA-G en la psoriasis y las miopat&iacute;as inflamatorias (B11). </font>     <P><font face="Verdana" size="2">En general, existen fuertes evidencias del papel    de las mol&eacute;culas HLA-G en la inducci&oacute;n de tolerancia en el embarazo,    en infecciones virales y en tumores. Este conocimiento puede ser de gran utilidad    en el manejo terap&eacute;utico futuro de estas entidades y para favorecer el    &eacute;xito del trasplante de &oacute;rganos y tejidos. </font>     <P>     <P>     <P>      <P>      <P><font face="Verdana" size="3"><B>REFERENCIAS BIBLIOGR&Aacute;FICAS</B> </font>     <P>      <!-- ref --><P><font face="Verdana" size="2">1. Carosella ED, Rouas-Freiss N, Pascale P, Dausset    J. HLA-G: A tolerance molecule from the Mayor Histocompatibility Complex. Immunol    Today 1999;20:60-2. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">2. Redman CW, McMichael AJ, Stirrat GM, Sunderland    CA, Ting A. Class 1 major histocompatibility complex antigens on human extra-villous    trophoblast. Immunology 1984;52:45768. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">3. Geraghty DE, Koller BH, Orr HT. A Human Mayor    Histocompatibility Complex class I gene that encodes a protein with a shortened    cytoplasmatic segment. Proc Natl Acad Sci USA 1987;84:9145-9. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">4. Carosella ED, Dausset J, Rouas-Freiss N. Immunotolerant    functions of HLA-G. Cell Mol Life Sci 1999;55,32733. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">5. Ishitani A, Sageshima N, Lee N, Dorofeeva    N, Hatake K, Marquardt H, et al. Protein expression and peptide binding suggest    unique and interacting functional roles for HLA-E, F, and G in maternal-placental    immune recognition. J Immunol 2003;171,137684. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">6. LeMaoult J, Krawice-Radanne I, Dausset J,    Carosella ED. HLA-G1-expressing antigen-presenting cells induce immunosuppressive    CD4+ T cells. Proc Natl Acad Sci USA 2004;101,70649. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">7. 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<body><![CDATA[<!-- ref --><P><font face="Verdana" size="2">46. Maejima M, Fujii T, Kozuma S, Okai T, Shibata    Y, Taketani Y. Presence of HLA-G-expressing cells modulates the ability of peripheral    blood mononuclear cells to release cytokines. Am J Reprod Immunol 1997;38:7982.    </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">47. Kapasi K, Albert SE, Yie S, Zavazava N, Librach    CL. HLA-G has a concentration-dependent effect on the generation of an allo-CTL    response. Immunology 2000;101:191200. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">48. Pfeiffer K, Fimmers R, Engels G, van der    Ven H, van der Ven K. The HLA-G genotype is potentially associated with idiopathic    recurrent spontaneous abortion. Mol Hum Reprod 2001;7:373-78. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">49. Pfeiffer KA, Rebmann V, van der Ven K. Soluble    histocompatibility antigen levels in early pregnancy after IVF. Hum Immunol    2000;61:55964. </font>    <P>      <!-- ref --><P><font face="Verdana" size="2">50. Yie SM, Li LH, Li YM, Librach C. HLA-G protein    concentrations in maternal serum and placental tissue are decreased in preeclampsia.    Am J Obstet Gynecol 2004;191:52529. </font>    <P>      ]]></body>
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<body><![CDATA[<P>      <P>      <P>     <P>     <P><font face="Verdana" size="2">Recibido: 15 de julio del 2009.     <br>   </font><font face="Verdana" size="2">Aprobado: 12 de julio del 2009. </font>     <P>     <P>      <P>     <P>     ]]></body>
<body><![CDATA[<P>      <P>      <P><font face="Verdana" size="2">Dra. <I>Mar&iacute;a E. Alfonso Vald&eacute;s</I>.    Instituto de Hematolog&iacute;a e Inmunolog&iacute;a. Apartado Postal 8070.    Ciudad de La Habana, CP 10800, Cuba. Tel (537) 6438268, 6438695, Fax (537) 6442334.    e-mail: </font> <font face="Verdana" size="2"><U><FONT  COLOR="#0000ff"><a href="mailto:ihidir@hemato.sld.cu">ihidir@hemato.sld.cu</a></FONT></U></font>    Sitio Web:<U><font face="Verdana" size="2" color="#0000ff"> <font size="2" face="Verdana, Arial, Helvetica, sans-serif"><a href="http://www.sld.cu/sitios/ihi">http://www.sld.cu/sitios/ihi</a></font>      ]]></body><back>
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