<?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>0034-7434</journal-id>
<journal-title><![CDATA[Revista Colombiana de Obstetricia y Ginecología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Colomb Obstet Ginecol]]></abbrev-journal-title>
<issn>0034-7434</issn>
<publisher>
<publisher-name><![CDATA[Federación Colombiana de Obstetricia y GinecologíaRevista Colombiana de Obstetricia y Ginecología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74342009000400006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Papel de la inmunología en la endocrinología ginecológica: revisión de la literatura]]></article-title>
<article-title xml:lang="en"><![CDATA[The role of immunology in gynaecological endocrinology: a literature review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Yamal]]></surname>
<given-names><![CDATA[Ivonne]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Wagner]]></surname>
<given-names><![CDATA[Carolina]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Militar Nueva Granada Hospital Miitar Central Unidad de Fertilidad y Endocrinología Reproductiva]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Militar Nueva Granada Hospital Miitar Central Unidad de Fertilidad y Endocrinología Reproductiva]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2009</year>
</pub-date>
<volume>60</volume>
<numero>4</numero>
<fpage>348</fpage>
<lpage>356</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0034-74342009000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0034-74342009000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0034-74342009000400006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Objetivos: revisar la asociación que existe entre los diferentes mecanismos inmunes y los eventos endocrinos necesarios para la regulación de la reproducción humana. Metodología: el presente trabajo es una revisión sistemática cualitativa, para la cual se consultaron las bases de datos de Ovid y PubMed/Medline, seleccionando artículos publicados entre 1984 y 2009 referentes a estudios en animales y humanos que demostraran la relación existente entre los esteroides y la hormona liberadora de gonadotropinas con el sistema inmune, así como su expresión en algunas enfermedades de tipo autoinmune. Resultados: muchos estudios experimentales en animales han demostrado una asociación entre el sistema inmune y los diferentes ejes neuroendocrinos que regulanla reproducción humana. Aunque en el hombre no han sido dilucidados los mecanismos definitivos, se ha observado que la Hormona Liberadora de Gonadotropinas (Gonadotropin-Releasing Hormone [GnRH]) y los esteroides sexuales tienen efectos a nivel de la programación del sistema inmune y su modulación. De la misma forma, se advierte que sistemas inmunes como el de la interleucina-1 juegan un papel importante en la regulación del eje hipotálamo-hipófisis-gónada y de otros ejes involucrados en la reproducción. Conclusiones: la GnRH y los esteroides son moduladores de la respuesta inmune de manera que pueden estimularla o suprimirla. Los sistemas inmunes como el de interleucinas (IL-1) tienen efectos antigonadotróficos a nivel central, y esteroidogénicos a nivel ovárico, relacionándose así con otros sistemas como el adrenal y el tiroideo con respecto a la ovulación y a la formación del cuerpo lúteo y su regresión; procesos importantes en la reproducción.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Objectives: reviewing the association between different immune mechanisms and endocrine events necessary for regulating human reproduction. Methodology: this was a qualitative systematic review which involved consulting databases like OVID,Medline(Pubmed-MeSH),selectingarticles from 1984 to 2009 referring to animal and human studies demonstrating the relationship of steroids and the gonadotrophin-releasing hormone (GnRH) with the immune system, as well as their expression in some autoimmune illnesses. Results: many experimental studies in animals have demonstrated an association among the immune system and different neuroendocrine axes regulating human reproduction. Even though the definitive mechanisms have not yet been elucidated in humans, it has been found that GnRH and sexual steroids have an effect at immune system programming level and on their modulation. Interleukin-1 also plays an important role in regulating the hypothalamus-hypophysis-gonad axis and other axes involved in the reproduction. Conclusions: the sexual steroids and GnRH are immune response modulators in such a way that they may stimulate it or have an immunosuppressor role. Immune systems like interleukin (IL-1) have antigonadotropic action at central level and a steroidogenic effect at ovarian level; they are related to the adrenal axis and thyroid activity, ovulation, luteous body formation and regression, all being important processes in reproduction.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[GnRH]]></kwd>
<kwd lng="es"><![CDATA[estrógenos]]></kwd>
<kwd lng="es"><![CDATA[andrógenos]]></kwd>
<kwd lng="es"><![CDATA[citoquinas]]></kwd>
<kwd lng="es"><![CDATA[interleucinas]]></kwd>
<kwd lng="es"><![CDATA[quimoquinas]]></kwd>
<kwd lng="es"><![CDATA[linfocitos]]></kwd>
<kwd lng="es"><![CDATA[ovulación]]></kwd>
<kwd lng="es"><![CDATA[prostaglandinas]]></kwd>
<kwd lng="en"><![CDATA[GnRH]]></kwd>
<kwd lng="en"><![CDATA[oestrogen]]></kwd>
<kwd lng="en"><![CDATA[androgen]]></kwd>
<kwd lng="en"><![CDATA[cytokine]]></kwd>
<kwd lng="en"><![CDATA[interleukin]]></kwd>
<kwd lng="en"><![CDATA[chemokine]]></kwd>
<kwd lng="en"><![CDATA[lymphocyte]]></kwd>
<kwd lng="en"><![CDATA[ovulation]]></kwd>
<kwd lng="en"><![CDATA[prostaglandin]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <p><font size="4" face="verdana">    <center><b>Papel de la inmunolog&iacute;a en la endocrinolog&iacute;a ginecol&oacute;gica: revisi&oacute;n de la literatura</b></center></font></p>      <p>    <center>Ivonne D&iacute;az-Yamal, M.D.*, Carolina Ruiz-Wagner, M.D.**</center></p>      <p>    <center>Recibido: julio 1/09 - Aceptado: octubre 26/09</center></p>      <p>* Especialista en Ginecolog&iacute;a y Obstetricia. Docente de la Unidad de Fertilidad y Endocrinolog&iacute;a Reproductiva, Hospital Militar Central, Universidad Militar Nueva Granada. Unidad de Fertilidad por Procreaci&oacute;n Medicamente Asistida (PMA), Cl&iacute;nica Marly. Bogot&aacute; (Colombia). </p>  </p>      <p>** Residente de 3er a&ntilde;o de la Universidad Militar Nueva Granada, Bogot&aacute; (Colombia). Rotaci&oacute;n por Unidad de Fertilidad y Endocrinolog&iacute;a Reproductiva, Hospital Militar Central. Bogot&aacute; (Colombia). Correo electr&oacute;nico: <a href="mailto:ncrwagner@hotmail.com">ncrwagner@hotmail.com</a></p>      <p><b>RESUMEN </b></p>      ]]></body>
<body><![CDATA[<p><b>Objetivos:</b> revisar la asociaci&oacute;n que existe entre los diferentes mecanismos inmunes y los eventos endocrinos necesarios para la regulaci&oacute;n de la reproducci&oacute;n humana. </p>      <p><b>Metodolog&iacute;a:</b> el presente trabajo es una revisi&oacute;n sistem&aacute;tica cualitativa, para la cual se consultaron las bases de datos de Ovid y PubMed/Medline, seleccionando art&iacute;culos publicados entre 1984 y 2009 referentes a estudios en animales y humanos que demostraran la relaci&oacute;n existente entre los esteroides y la hormona liberadora de gonadotropinas con el sistema inmune, as&iacute; como su expresi&oacute;n en algunas enfermedades de tipo autoinmune. </p>      <p><b>Resultados:</b> muchos estudios experimentales en animales han demostrado una asociaci&oacute;n entre el sistema inmune y los diferentes ejes neuroendocrinos que regulanla reproducci&oacute;n humana. Aunque en el hombre no han sido dilucidados los mecanismos definitivos, se ha observado que la Hormona Liberadora de Gonadotropinas (Gonadotropin-Releasing Hormone [GnRH]) y los esteroides sexuales tienen efectos a nivel de la programaci&oacute;n del sistema inmune y su modulaci&oacute;n. De la misma forma, se advierte que sistemas inmunes como el de la interleucina-1 juegan un papel importante en la regulaci&oacute;n del eje hipot&aacute;lamo-hip&oacute;fisis-g&oacute;nada y de otros ejes involucrados en la reproducci&oacute;n. </p>      <p><b>Conclusiones:</b> la GnRH y los esteroides son moduladores de la respuesta inmune de manera que pueden estimularla o suprimirla. Los sistemas inmunes como el de interleucinas (IL-1) tienen efectos antigonadotr&oacute;ficos a nivel central, y esteroidog&eacute;nicos a nivel ov&aacute;rico, relacion&aacute;ndose as&iacute; con otros sistemas como el adrenal y el tiroideo con respecto a la ovulaci&oacute;n y a la formaci&oacute;n del cuerpo l&uacute;teo y su regresi&oacute;n; procesos importantes en la reproducci&oacute;n. </p>      <p><b>Palabras clave:</b> GnRH, estr&oacute;genos, andr&oacute;genos, citoquinas, interleucinas, quimoquinas, linfocitos, ovulaci&oacute;n, prostaglandinas. </p>       <p><font size="4">    <center><b>The role of immunology in gynaecological endocrinology: a literature review</b></center></font></p>      <p><b>SUMMARY</b> </p>      <p><b>Objectives:</b> reviewing the association between different immune mechanisms and endocrine events necessary for regulating human reproduction. </p>      <p><b>Methodology:</b> this was a qualitative systematic review which involved consulting databases like OVID,Medline(Pubmed-MeSH),selectingarticles from 1984 to 2009 referring to animal and human studies demonstrating the relationship of steroids and the gonadotrophin-releasing hormone (GnRH) with the immune system, as well as their expression in some autoimmune illnesses.     ]]></body>
<body><![CDATA[<p><b>Results:</b> many experimental studies in animals have demonstrated an association among the immune system and different neuroendocrine axes regulating human reproduction. Even though the definitive mechanisms have not yet been elucidated in humans, it has been found that GnRH and sexual steroids have an effect at immune system programming level and on their modulation. Interleukin-1 also plays an important role in regulating the hypothalamus-hypophysis-gonad axis and other axes involved in the reproduction. </p>     <p><b>Conclusions:</b> the sexual steroids and GnRH are immune response modulators in such a way that they may stimulate it or have an immunosuppressor role. Immune systems like interleukin (IL-1) have antigonadotropic action at central level and a steroidogenic effect at ovarian level; they are related to the adrenal axis and thyroid activity, ovulation, luteous body formation and regression, all being important processes in reproduction. </p>     <p><b>Key words:</b> GnRH, oestrogen, androgen, cytokine, interleukin, chemokine, lymphocyte, ovulation, prostaglandin. </p>     <p><b>INTRODUCCI&Oacute;N </b></p>     <p>La interacci&oacute;n entre los sistemas endocrino, nervioso e inmune ha sido    ampliamente estudiada en trabajos experimentales principalmente en animales.<sup>1    </sup>Por el contrario, en el hombre, los mecanismos definitivos no han sido    dilucidados pero se cree que existe una influencia del eje hipot&aacute;lamo-hip&oacute;fisis-g&oacute;nada    (Hormona Liberadora de Gonadotropinas y esteroides sexuales) en la regulaci&oacute;n    del sistema inmune y una respuesta g&eacute;nero-espec&iacute;fica, considerando    que enfermedades como el Lupus Eritematoso Sist&eacute;mico tiene una mayor    incidencia en la poblaci&oacute;n femenina.<sup>1 </sup></p>     <p>As&iacute; pues, el sistema inmune tiene un importante papel en la regulaci&oacute;n    de los diferentes ejes (hipot&aacute;lamo-hip&oacute;fisis-g&oacute;nada, hipot&aacute;lamo-hip&oacute;fisis-adrenal,    hipot&aacute;lamo-hip&oacute;fisis-tiroides), siendo el sistema de interleucinas,    principalmente IL-1, el mejor estudiado con funciones de <i>feedback </I>negativo    a diferentes niveles y localmente en el ovario, lo cual evidencia c&oacute;mo    la reproducci&oacute;n humana est&aacute; ligada con la respuesta inmunitaria.<sup>2,3    </sup></p>     <p>Por lo tanto, el objetivo del presente documento es revisar la asociaci&oacute;n existente entre los diferentes mecanismos inmunes con los eventos endocrinos necesarios para la regulaci&oacute;n de la reproducci&oacute;n humana. Lo anterior, a partir de la evidencia que actualmente existe acerca de la acci&oacute;n de los mecanismos endocrinos en el sistema inmune, el efecto de las citoquinas en el sistema endocrino, las interacciones entre los sistemas inmune, endocrino y nervioso; y por &uacute;ltimo, la asociaci&oacute;n entre la respuesta inmune con la falla ov&aacute;rica y la endometriosis. </p>     <p><b>METODOLOG&Iacute;A</b></p>     <p><b>Estrategia de b&uacute;squeda </b></p>     <p>Se seleccionaron las siguientes palabras clave:<i> &quot;GnRH&quot;,&quot;estr&oacute;genos&quot;,&quot;andr&oacute;genos&quot;,&quot;citoquinas&quot;,&quot;interleucinas&quot;,    &quot;quimoquinas&quot;, &quot;linfocitos&quot;, &quot;ovulaci&oacute;n&quot;,    &quot;prostaglandinas&quot;.</i> Acto seguido, se realiz&oacute; una b&uacute;squeda    electr&oacute;nica en las bases de datos de Ovid y PubMed/Medline, seleccionando    art&iacute;culos publicados entre 1984 y 2009 para identificar la literatura    relevante, as&iacute; como una b&uacute;squeda de la literatura en algunos textos    de endocrinolog&iacute;a ginecol&oacute;gica. </p>     ]]></body>
<body><![CDATA[<p><b>Criterios de selecci&oacute;n </b></p>     <p>Se incluyeron aquellos art&iacute;culos referentes a estudios en animales y humanos que demostraran la relaci&oacute;n existente entre los esteroides y la hormona liberadora de gonadotropinas con el sistema inmune, as&iacute; como su expresi&oacute;n en algunas enfermedades de tipo autoinmune. </p>     <p><b>RESULTADOS </b></p>     <p>En total, se obtuvieron 53 art&iacute;culos con los criterios de selecci&oacute;n previamente descritos. A continuaci&oacute;n se presenta la evidencia encontrada. </p>     <p><b>GnRH, esteroides sexuales y sistema inmune </b></p>     <p>Se han reportado sitios de uni&oacute;n espec&iacute;ficos para GnRH en cultivos de linfocitos de porcinos<sup>2 </sup>y en timo<sup>3 </sup>y bazo de ratas.<sup>4 </sup>La GnRH t&iacute;mica id&eacute;ntica a la hipotal&aacute;mica en ratas reci&eacute;n nacidas fue reportada por primera vez en 1992,<sup>5 </sup>y la expresi&oacute;n del ARN mensajero (mRNA, por sus siglas en ingl&eacute;s) de GnRH fue demostrada en c&eacute;lulas inmunes de porcinos (timo, bazo, linfocitos perif&eacute;ricos) en 1997.<sup>6 </sup>En contraste, en humanos la presencia de GnRH inmunorreactiva y bioactiva en c&eacute;lulas T perif&eacute;ricas (CD4, CD8)<sup>7 </sup>y linfocitos B perif&eacute;ricos regula la proliferaci&oacute;n de c&eacute;lulas inmunes sugiriendo una funci&oacute;n autocrina.<sup>8 </sup>Asimismo, &eacute;sta se ha involucrado en la maduraci&oacute;n del timo<sup>9 </sup>y en la programaci&oacute;n prenatal y postnatal de c&eacute;lulas inmunes animales.<sup>10 </sup>La timopoyesis es esencial para el establecimiento de c&eacute;lulas T en la vida temprana y adulta, siendo m&aacute;s importante en condiciones de deficiencia inmune tales como infecci&oacute;n por VIH, trasplante de m&eacute;dula &oacute;sea y per&iacute;odos de leucopenia luego de altas dosis de quimioterapia cuando la reconstituci&oacute;n inmune es requerida.<sup>11 </sup></p>     <p>En resumen, los estudios en humanos y roedores demuestran que la GnRH: </p>     <p>1. Estimula los receptores de IL-2 para la proliferaci&oacute;n y/o activaci&oacute;n de c&eacute;lulas T y B. </p>     <p>2. Aumenta la producci&oacute;n de interfer&oacute;n gama por las c&eacute;lulas perif&eacute;ricas mononucleares.<sup>12 </sup></p>     <p>3. Juega un papel relevante en la programaci&oacute;n prenatal y postnatal de c&eacute;lulas inmunes. En cuanto a los esteroides sexuales, se ha encontrado que &eacute;stos influyen en el desarrollo de la inmunidad celular en tejidos linfoides primarios (m&eacute;dula &oacute;sea y timo); y adicionalmente, tienen efectos inmunomoduladores en c&eacute;lulas T y B perif&eacute;ricas. En humanos, se han encontrado receptores de andr&oacute;genos (ARs, por sus siglas en ingl&eacute;s) y de estr&oacute;genos (ER, por sus siglas en ingl&eacute;s) en &oacute;rganos linfoides primarios;<sup>13,14 </sup>y a nivel perif&eacute;rico, s&oacute;lo receptores de estr&oacute;genos.<sup>15,16 </sup></p>     ]]></body>
<body><![CDATA[<p>Adem&aacute;s de lo anterior, los andr&oacute;genos ejercen efectos considerables en el tama&ntilde;o y la composici&oacute;n del timo, disminuyendo la proliferaci&oacute;n y aumentando la apoptosis celular.<sup>17 </sup>En el caso de los receptores de estr&oacute;geno ER-beta, estos son responsables de: </p>     <p>1. La formaci&oacute;n de c&eacute;lulas B en la medula &oacute;sea.<sup>18 </sup></p>     <p>2. Estimular las c&eacute;lulas CD4+ y CD8+. </p>     <p>3. Activar una v&iacute;a extrat&iacute;mica de autoreactivaci&oacute;n de la diferenciaci&oacute;n de c&eacute;lulas T en el h&iacute;gado.<sup>19 </sup></p>     <p>4. A nivel perif&eacute;rico en las c&eacute;lulas B, aumentar el n&uacute;mero de anticuerpos y los niveles de autoanticuerpos circulantes sin aumentar el n&uacute;mero de c&eacute;lulas.<sup>20 </sup>En general, los andr&oacute;genos inhiben la respuesta inmune mientras los estr&oacute;genos estimulan la inmunidad celular y humoral.</p>     <p>Esta podr&iacute;a ser la raz&oacute;n por la cual losdes&oacute;rdenes autoinmunes son m&aacute;s comunes en las mujeres, de ah&iacute; que los esteroides sexuales cumplan un papel importante en la respuesta dim&oacute;rfica sexual del sistema inmune. Ahora bien, la relaci&oacute;n entre los esteroides sexuales y la autoinmunidad ha sido estudiada en modelos de ratones con lupus eritematoso sist&eacute;mico, diabetes insulino-dependientes y tiroiditis,<sup>21 </sup>encontrando que el estradiol incrementa la producci&oacute;n de autoanticuerpos (IgG anticardiolipina y anti DNA) y acelera la progresi&oacute;n de la respuesta inmune humoral autoinmune activando la v&iacute;a de la TH2, mientras que los andr&oacute;genos tienen un efecto protector.<sup>21 </sup></p>     <p>De otra parte, a&uacute;n no es claro si la GnRH tiene efectos directos en las c&eacute;lulas inmunes por est&iacute;mulo local de su receptor o si act&uacute;a indirectamente con la activaci&oacute;n del eje hipot&aacute;lamo-hip&oacute;fisis-g&oacute;nada con aumento de los esteroides sexuales; sin embargo, se considera que los estr&oacute;genos ejercen un efecto estimulante en las c&eacute;lulas B y un aumento en niveles de IgG en presencia de GnRH pero no en su ausencia. La testosterona, por suparte, ejerce un efecto supresor en c&eacute;lulas B en presencia de GnRH pero no en su ausencia, mientras que ambos tipos de esteroides ejercen efectos divergentes en c&eacute;lulas T independientemente de la presencia o ausencia de GnRH.<sup>22 </sup><a href="#Tabla1">Tabla 1</a>. </p>     <p>    <center><img src="img/revistas/rcog/v60n4/a06t1.jpg"><a name="Tabla1"></a></center></p>     <p><b>Citoquinas y sistema endocrino </b></p>     ]]></body>
<body><![CDATA[<p>Las citoquinas cumplen funciones autocrinas y paracrinas regulando la funci&oacute;n    inmune, metab&oacute;lica y endocrina. Lo anterior ocurre principalmente al    interactuar con los ejes hipot&aacute;lamo-hip&oacute;fisis-g&oacute;nada, hipot&aacute;lamo-hip&oacute;fisis-adrenal,    hipot&aacute;lamo-hip&oacute;fisis-tiroides a nivel local en el ovario y el    endometrio como mediadores en los diferentes procesos de la reproducci&oacute;n    humana.<sup>23,24 </sup>Actualmente, el sistema de la interleucina 1 (IL-1)    es el que mejor caracterizado est&aacute; y su relaci&oacute;n con la funci&oacute;n    reproductiva ha sido descrita claramente.<sup>25 </sup>      <p><b>Efecto a nivel del eje hipot&aacute;lamo-hip&oacute;fisis-g&oacute;nada </b></p>     <p>Existen receptores para (IL-1) en las membranas plasm&aacute;ticas en c&eacute;lulas T, neuronas hipotal&aacute;micas y c&eacute;lulas B.<sup>26-28 </sup>Varios autores han estudiado los efectos de esta citoquina en el eje hipot&aacute;lamohip&oacute;fisis-g&oacute;nada en modelos animales de ratas <i>in vivo </I>e <i>in vitro</I>,<sup>29 </sup>hallando que la administraci&oacute;n intracerebroventricular de IL-1: </p>     <p>1. Inhibe la liberaci&oacute;n de la hormona luteinizante (LH, por sus siglas en ingl&eacute;s) con una especificidad suficiente para excluir un efecto en la secreci&oacute;n de la hormona fol&iacute;culo-estimulante (FSH, por sus siglas en ingl&eacute;s).<sup>30 </sup></p>     <p>2. Se asocia con un incremento en los niveles de prolactina y la hormona de crecimiento,<sup>31 </sup>lo cual evidencia el efecto antigonadotr&oacute;fico de esta interleucina.<sup>32,33 </sup></p>     <p>3. A nivel gonadal existen receptores los cuales permiten una funci&oacute;n esteroidog&eacute;nica bajo condiciones experimentales<sup>34 </sup>pero en humanos a&uacute;n es controversial ya que los monocitos en sangre perif&eacute;rica y los macr&oacute;fagos peritoneales son capaces de estimular la producci&oacute;n de progesterona por las c&eacute;lulas de la granulosa luteinizada.<sup>35 </sup></p>     <p>4. Modula la secreci&oacute;n de gonadotropinas y esteroides gonadales y viceversa.    Se han descrito varias explicaciones acerca de la regulaci&oacute;n hormonal    del sistema inmune ya que se ha evidenciado que los linfocitos humanos secretan    (LH), hormona fol&iacute;culo-estimulante (FSH) o fracci&oacute;n beta-espec&iacute;fica    de la gonadotrofina cori&oacute;nica humana (BHCG, por sus siglas en ingl&eacute;s)    inmunorreactiva y bioactiva,<sup>36 </sup>las gonadotropinas regulan el mRNA    de IL-1 expresados en c&eacute;lulas hematopoy&eacute;ticas, la preovulaci&oacute;n    dependiente de gonadotropinas induce la trascripci&oacute;n de IL-1 en c&eacute;lulas    teca intersticiales en murinos y humanos<sup>37 </sup>y la producci&oacute;n    monoc&iacute;tica humana de IL-1 beta es regulada por esteroides gonadales.<sup>38    </sup><a href="#Figura1">Figura 1</a>. </p>     <p>    <center><img src="img/revistas/rcog/v60n4/a06f1.jpg"><a name="Figura1"></a></center></p>     <p><b>Efecto a nivel del eje hipot&aacute;lamo-hip&oacute;fisis-suprarrenal</b></p>     ]]></body>
<body><![CDATA[<p>Se sabe que la hiperfunci&oacute;n e hipofunci&oacute;n de la gl&aacute;ndula suprarrenal resulta en anovulaci&oacute;n cr&oacute;nica y amenorrea. El sistema IL-1 activa el eje hipot&aacute;lamo-hip&oacute;fisis-adrenal a diferentes niveles.<sup>39 </sup>Asimismo, la IL-1 produce un aumento en la hormona liberadora de corticotropina (CRH, por sus siglas en ingl&eacute;s) a nivel hipotal&aacute;mico con la posterior liberaci&oacute;n de la hormona adrenocorticotropa (ACTH, por sus siglas en ingl&eacute;s) y de glucocorticoides,<sup>40 </sup>y en la corteza adrenal, estimula la producci&oacute;n de glucocorticoides. De forma inversa, los glucocorticoides inhiben la excesiva activaci&oacute;n del eje y modulan muchas actividades inmunes incluyendo la secreci&oacute;n de IL-1.<sup>41 </sup></p>     <p><b>Efecto a nivel del eje hipot&aacute;lamo-hip&oacute;fisis-tiroides </b></p>     <p>Las enfermedades tiroideas comunes en mujeres interfieren con la funci&oacute;n reproductiva tanto en falla reproductiva como en anovulaci&oacute;n o p&eacute;rdida del embarazo. </p>     <p>Estudios <i>in vitro </I>muestran que la IL-1 <b>inhibe</b> el eje hipot&aacute;lamo-hip&oacute;fisis-tiroides al suprimir la secreci&oacute;n de la hormona estimulante de la tiroides (TSH, por sus siglas en ingl&eacute;s),<sup>42 </sup>la bios&iacute;ntesis y la liberaci&oacute;n de hormonas tiroideas y el crecimiento de las c&eacute;lulas tiroideas, especialmente en altas dosis.<sup>43 </sup><a href="#Figura2">Figura 2</a>. </p>     <p>    <center><img src="img/revistas/rcog/v60n4/a06f2.jpg"><a name="Figura2"></a></center></p>     <p><b>Efecto a nivel ov&aacute;rico </b></p>     <p>En cuanto al ovario, se sabe que la IL-1 estimula la producci&oacute;n de prostaglandinas (principalmente la E y F) necesarias en el proceso de ovulaci&oacute;n, la atresia y la funci&oacute;n del cuerpo l&uacute;teo durante las fases preovulatoriayl&uacute;tea.<sup>44 </sup>Subtipos de c&eacute;lulas inmunes son reclutadas por quimoquinas foliculares permitiendo la liberaci&oacute;n de enzimas proteol&iacute;ticas, citoquinas, radicales libres y otros mediadores apoptoicos para la ovulaci&oacute;n, la neovascularizaci&oacute;n (luteinizaci&oacute;n) y la regresi&oacute;n del cuerpo l&uacute;teo. El rescate del cuerpo l&uacute;teo se da por la disminuci&oacute;n de macr&oacute;fagos en embarazo temprano, lo cual implica a la progesterona como una inhibidora de la respuesta inmune-celular.<sup>45 </sup>     <p><b>Interacci&oacute;n inmune-endocrino-neurol&oacute;gica </b></p>     <p>El control de las funciones endocrinas e inmunes van de la mano con la expresi&oacute;n    de otros tipos de hormonas metab&oacute;licas y factores de crecimiento como    la leptina y la grelina, estados de estr&eacute;s y el sistema nervioso simp&aacute;tico,    principalmente.<sup>46 </sup>La hormona de crecimiento (GH, por sus siglas en    ingl&eacute;s) junto con el factor de crecimiento insulinoide tipo I (IGF-1)    median la proliferaci&oacute;n de c&eacute;lulas como los condrocitos, fibroblastos,    adipositos, mioblastos y linfocitos.<sup>47 </sup>La leptina, en cambio, ejerce    un efecto modulador de las respuestas inmunes e inflamatorias al igual que una    hormona-citoquina;<sup>48 </sup>y a nivel reproductivo, en niveles bajos, permite    el aumento del neurop&eacute;ptido Y (NPY) en las c&eacute;lulas hipotal&aacute;micas,    el cual en presencia de estr&oacute;genos puede estimular la liberaci&oacute;n    de GnRH y gonadotropinas, pero en su ausencia es inhibitorio.<sup>49 </sup>En    contraste, la grelina posee efectos inhibitorios ante la respuesta inmune en    la expresi&oacute;n de citoquinas proinflamatorias.<sup>50 </sup>En estados    de estr&eacute;s, la activaci&oacute;n del eje hipot&aacute;lamo-hip&oacute;fisis-adrenal    con liberaci&oacute;n de glucocorticoides y catecolaminas en el sistema nervioso    simp&aacute;tico impactan sobre la funci&oacute;n inmune, reduciendo la actividad    de las c&eacute;lulas <i>Natural Killer </I>(NK) la respuesta humoral.<sup>51    </sup>A nivel del eje hipot&aacute;lamo-hip&oacute;fisis-g&oacute;nada hay un    efecto inhibitorio por parte de los productos de la proopiomelanocortina (POMC),    las endorfinas y los opioides. </p>     ]]></body>
<body><![CDATA[<p><b>Endometriosis y falla ov&aacute;rica </b></p>     <p>Las enfermedades como la endometriosis, caracterizada por la proliferaci&oacute;n y funcionamiento de c&eacute;lulas endometriales ect&oacute;picas, se asocia con una alta producci&oacute;n de anticuerpos anormales de tipo IgG e IgA contra el tejido endometrial y ov&aacute;rico, una disminuci&oacute;n en el reconocimiento de ant&iacute;genos endometriales aut&oacute;logos, una reducci&oacute;n de la citotoxicidad en las c&eacute;lulas <i>Natural Killer </I>y una resistencia de las c&eacute;lulas endometriales ect&oacute;picas a su destrucci&oacute;n.<sup>52 </sup>En la falla ov&aacute;rica prematura se encuentran anticuerpos contra c&eacute;lulas esteroideas, autoanticuerpos contra enzimas como la 17-alfa hidroxilasa, anticuerpos para el receptor de la FSH, y en 50%, autoanticuerpos para el receptor de LH y contra la zona pel&uacute;cida. Adem&aacute;s, se han hallado anticuerpos ov&aacute;ricos en 50%-60% de mujeres con infertilidad inexplicada y en 60%-70% de las pacientes con pobre respuesta a hiperestimulaci&oacute;n con gonadotropinas.<sup>53 </sup></p>     <p><b>CONCLUSIONES </b></p>     <p>Los diferentes estudios experimentales muestran como la GnRH y los esteroides sexuales son importantes en el desarrollo, la programaci&oacute;n y la modulaci&oacute;n del sistema inmune; y juegan un rol en la patog&eacute;nesis de los des&oacute;rdenes autoinmunes de tipog&eacute;nero-dependiente. As&iacute; pues, la GnRH cumple un papel estimulante en la respuesta inmune, los estr&oacute;genos estimulan la respuesta humoral inmune activando des&oacute;rdenes autoinmunes y los andr&oacute;genos tienen una actividad supresora de c&eacute;lulas T. Claramente, el sistema inmune tiene un rol autocrino, paracrino y endocrino en la regulaci&oacute;n de la reproducci&oacute;n humana en eventos como la ovulaci&oacute;n, la luteinizaci&oacute;n y la implantaci&oacute;n. Un ejemplo claro de esto es el sistema de citoquinas que modula los diferentes ejes endocrinos a distintos niveles.       <p><b>REFERENCIAS </b></p>      <!-- ref --><p>1. Tanriverdi F, Silveira LF, MacColl GS, Bouloux PM. The hypothalamic-pituitary-gonadalaxis:    immune function and autoimmunity. Endocrinol 2003;176:293-304. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000078&pid=S0034-7434200900040000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>2. Standaert FE, Chew BP, De Avila D, Reeves JJ. 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