<?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>1690-3110</journal-id>
<journal-title><![CDATA[Revista Venezolana de Endocrinología y Metabolismo]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Venez. Endocrinol. Metab.]]></abbrev-journal-title>
<issn>1690-3110</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Venezolana de Endocrinología y Metabolismo]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1690-31102011000300002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La otra cara de Janus y la enfermedad tiroidea autoinmune]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Joselyn]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre]]></surname>
<given-names><![CDATA[Miguel Angel]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cano]]></surname>
<given-names><![CDATA[Raquel]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villalobos]]></surname>
<given-names><![CDATA[Marjorie]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Berrueta]]></surname>
<given-names><![CDATA[Lisbeth]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de los Andes Instituto de Inmunología Clínica ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Autónomo Hospital Universitario de los Andes Unidad de Endocrinología ]]></institution>
<addr-line><![CDATA[Mérida ]]></addr-line>
<country>Venezuela</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad del Zulia Centro de Investigaciones Endocrino-Metabólicas Dr. Félix Gómez ]]></institution>
<addr-line><![CDATA[Maracaibo ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>9</volume>
<numero>3</numero>
<fpage>89</fpage>
<lpage>98</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S1690-31102011000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S1690-31102011000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S1690-31102011000300002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La enfermedad tiroidea autoinmune es una de las patologías más comunes dentro de la endocrinología. Este grupo de enfermedades que afectan la función tiroidea se consideran actualmente como parte de un espectro, donde por un lado se evidencia una hipofunción y donde predomina una respuesta inmune Th1 (Tiroiditis de Hashimoto) y en el lado opuesto, el de la hiperfunción, predomina una respuesta Th2 (Enfermedad de Graves). Si bien ambas enfermedades tienen ciertos locus de predisposición genética en común, las manifestaciones clínicas y el pronóstico de estas enfermedades son totalmente opuestas. Aunque se han planteado diversas teorías para explicar las diferencias en el patrón autoinmune de ambos extremos de este espectro, éstas no han logrado ilustrar la amplia variedad de fenotipos de esta patología. Evidencia actual sugiere que un grupo celular encargado de controlar la actividad de los elementos efectores de la respuesta inmune, limitando el daño hacia los tejidos del hospedador mediando la autotolerancia, y conocido como células T reguladoras, juegan un papel protagónico en el desarrollo de las enfermedades autoinmunes. El propósito de ésta revisión es exponer como la disregulación de la cara reguladora del sistema inmune, expresada tanto en la alteración de la función como en la expansión de las células T reguladoras, constituyen una piedra angular en las diversas formas de manifestación de la enfermedad tiroidea autoinmune.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Autoimmune thyroid disease is one of the most common diseases inside the field of endocrinology. This group of diseases affect the thyroid function in a manner that is now considered like a spectrum, where on one side there is evidence of hypofunction and a predominating Th1 response (Hashimoto´s thyroiditis), and on the opposite side, hyperfunction and a predominating Th2 response (Graves´ disease). Even though both diseases share loci for genetic predisposition, the outcome of each of them is totally opposite. Several theories have been proposed to explain the differences in the autoimmune patterns, but haven’t been able to explain the ample phenotypical manifestations of the disease. Current evidence suggests that a recently describe cellular group is in charge of controlling the effector elements of the immune response, limiting tissue damage and enhancing self-tolerance, these are the T regulator cells (Treg), which play a principal role in the development of autoimmune diseases. The purpose of this review is to expose the dysregulation of the regulatory side of the immune system expressed as the alteration of the functioning of Treg, which are now believed to be fundamental in the many phenotypes of autoimmune thyroid diseases.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[enfermedad tiroidea autoinmune]]></kwd>
<kwd lng="es"><![CDATA[células T reguladoras]]></kwd>
<kwd lng="es"><![CDATA[enfermedad de Graves]]></kwd>
<kwd lng="es"><![CDATA[tiroiditis de Hashimoto]]></kwd>
<kwd lng="en"><![CDATA[autoinmune thyroid disease]]></kwd>
<kwd lng="en"><![CDATA[T regulator cell]]></kwd>
<kwd lng="en"><![CDATA[Graves´ disease]]></kwd>
<kwd lng="en"><![CDATA[Hashimoto´s thyroiditis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p style="line-height: 100%" align="center"><b><span style="mso-fareast-font-family: Times New Roman; mso-ansi-language: ES; mso-fareast-language: ES; mso-bidi-language: AR-SA"><font face="Verdana" size="3">La otra cara de Janus y la enfermedad tiroidea autoinmune</font></span></p>     <p align="center" style="line-height: 100%"><font size="2" face="Verdana">Joselyn Rojas <sup>1,3</sup>, Miguel Angel Aguirre<sup>2,3</sup>, Raquel Cano<sup>3,4</sup>, Marjorie Villalobos<sup>2,3</sup>, Lisbeth Berrueta<sup>1</sup></font></p> </b>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana"><sup>1</sup>Instituto de Inmunología Clínica – Universidad de los Andes. Mérida, Venezuela. <sup>2</sup>Unidad de Endocrinología – Instituto Autónomo Hospital Universitario de los Andes. Mérida, Venezuela. <sup>3</sup>Centro de Investigaciones Endocrino-Metabólicas &quot;Dr. Félix Gómez – Universidad del Zulia. Maracaibo, Venezuela.<sup>4</sup> Unidad de Endocrinología y Enfermedades Metabólicas del Hospital Universitario de Caracas. Caracas – Venezuela.</font></p>     <p style="line-height: 100%" align="justify"><b><font size="2" face="Verdana">Dirigir correspondencia a: </font></b><font size="2" face="Verdana">Dra. Joselyn Rojas. <b>E-mail: </b><a href="mailto:rojas.joselyn@gmail.com">rojas.joselyn@gmail.com</a>.</font></p>     <p style="line-height: 100%" align="justify"><b><font SIZE="2"><font size="2" face="Verdana">RESUMEN</font></p> </font></b>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">La enfermedad tiroidea autoinmune es una de las patologías más comunes dentro de la endocrinología. Este grupo de enfermedades que afectan la función tiroidea se consideran actualmente como parte de un espectro, donde por un lado se evidencia una hipofunción y donde predomina una respuesta inmune Th1 (Tiroiditis de Hashimoto) y en el lado opuesto, el de la hiperfunción, predomina una respuesta Th2 (Enfermedad de Graves). Si bien ambas enfermedades tienen ciertos locus de predisposición genética en común, las manifestaciones clínicas y el pronóstico de estas enfermedades son totalmente opuestas. Aunque se han planteado diversas teorías para explicar las diferencias en el patrón autoinmune de ambos extremos de este espectro, éstas no han logrado ilustrar la amplia variedad de fenotipos de esta patología. Evidencia actual sugiere que un grupo celular encargado de controlar la actividad de los elementos efectores de la respuesta inmune, limitando el daño hacia los tejidos del hospedador mediando la autotolerancia, y conocido como células T reguladoras, juegan un papel protagónico en el desarrollo de las enfermedades autoinmunes. El propósito de ésta revisión es exponer como la disregulación de la cara reguladora del sistema inmune, expresada tanto en la alteración de la función como en la expansión de las células T reguladoras, constituyen una piedra angular en las diversas formas de manifestación de la enfermedad tiroidea autoinmune.</font></p> <b>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Palabras clave: </font></b><font size="2" face="Verdana">enfermedad tiroidea autoinmune, células T reguladoras, enfermedad de Graves, tiroiditis de Hashimoto.</font></p> <b><font SIZE="2">     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">ABSTRACT</font></p> </font></b>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Autoimmune thyroid disease is one of the most common diseases inside the field of endocrinology. This group of diseases affect the thyroid function in a manner that is now considered like a spectrum, where on one side there is evidence of hypofunction and a predominating Th1 response (Hashimoto´s thyroiditis), and on the opposite side, hyperfunction and a predominating Th2 response (Graves´ disease). Even though both diseases share loci for genetic predisposition, the outcome of each of them is totally opposite. Several theories have been proposed to explain the differences in the autoimmune patterns, but haven’t been able to explain the ample phenotypical manifestations of the disease. Current evidence suggests that a recently describe cellular group is in charge of controlling the effector elements of the immune response, limiting tissue damage and enhancing self-tolerance, these are the T regulator cells (Treg), which play a principal role in the development of autoimmune diseases. The purpose of this review is to expose the dysregulation of the regulatory side of the immune system expressed as the alteration of the functioning of Treg, which are now believed to be fundamental in the many phenotypes of autoimmune thyroid diseases.</font></p> <b>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">Key words: </font></b><font size="2" face="Verdana">autoinmune thyroid disease, T regulator cell, Graves´ disease, Hashimoto´s thyroiditis.</font></p>     ]]></body>
<body><![CDATA[<p style="line-height: 100%" align="justify"><b><font size="2" face="Verdana">Artículo recibido en: </font></b><font size="2" face="Verdana">Agosto 2011. <b>Aceptado para publicación en: </b>Septiembre 2011.</font></p>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">Para la mitología Romana, el Dios Janus fue una deidad capaz de ver hacia el pasado y hacia el futuro (aunque de forma académica se denomina &quot;el dios de los principios y las transiciones&quot;), siendo simbolizado con dos caras que miraban al este y al oeste respectivamente<b><sup>1</sup></b>. De acuerdo con los escritos, él dominaba los Cielos y todo aquel que quisiera entrar debía pasar por él, inclusive el mismo Júpiter, por lo que se postula como el dios más importante de la mitología. Debido a su capacidad de observar ampliamente como inician y finalizan diferentes procesos (en especial los relacionados con agricultura), Janus es el dios de las puertas y entradas, siendo venerado en los solsticios, inicio de cosechas, inclusive se ha llegado a considerar como el creador del Hombre ya que es la deidad que preside el comienzo de cualquier cosa u evento<b><sup>1</sup></b>.</font></p>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Al extrapolar este escenario hacia el contexto fisiológico de la respuesta inmune, este sistema inmune actuaría como una dualidad efectora y reguladora, en la cual existe un equilibrio entre elementos efectores y los que regulan dicha actividad. Una de las caras del sistema inmune está compuesta por subtipos celulares capaces de ejercer la función de defensa, abarcando tanto células del sistema innato como del adaptativo, por ejemplo las células asesinas naturales o &quot;natural killer&quot; (NK), monocitos/macrófagos, polimorfonucleares, linfocitos B, linfocitos T CD4+ y CD8+; mientras que su contraparte abarca todas las poblaciones celulares encargadas de regular la duración, extensión y cese de las respuestas efectoras. En esta revisión se analizará la otra cara de Janus, el papel de las células reguladoras en los fenómenos de autoinmunidad asociados a la enfermedad tiroidea autoinmune (ETAI).</font></p> <b>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">CONCEPTOS BÁSICOS</font></p> </b>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Se considera autoinmunidad al fenómeno en el cual el sistema inmune efector se vuelca hacia las células propias (sanas), o dicho en otras palabras, cuando existe una respuesta inmune hacia antígenos del hospedador (auto-antígenos)<b><sup>2</sup></b>.</font></p>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">La patogenia de la autoinmunidad es mucho más compleja de lo que se proponía en el pasado, involucrando factores moleculares, ambientales y genéticos en el desarrollo y progresión de dichas enfermedades, como por ejemplo: mimetismo molecular, activación por espectador inocente, polimorfismos del antígeno leucocitario humano (HLA), modificaciones post-traduccionales de proteínas, mutaciones puntuales de factores de transcripción fundamentales, y pérdida de la tolerancia central y/o periférica. Desde un punto de vista evolutivo, el sistema inmune adaptativo aparece en la llamada Catástrofe Oxigénica<b><sup>3</sup> </b>o el Big Bang Evolucionario4 hace 600 millones de años. Antes de la aparición de los vertebrados con mandíbula (gnathostomos), los seres vivos desarrollaron un sistema de defensa &quot;primitivo&quot; innato, basado en el desarrollo de receptores genéricos los cuales reconocían patrones moleculares conservados y eran capaces de activar una respuesta inflamatoria<b><sup>4</sup></b>. Al aparecer en los gnathotosmos, se inicia la evolución de un sistema de defensa más avanzado en el cual la memoria inmunológica es fundamental para el reconocimiento de patógenos en encuentros posteriores, mediando una respuesta efectiva de defensa, basada en elementos tanto humorales (anticuerpos) como celulares<b><sup>4</sup></b>. Si bien, ambos sistemas de defensa se han mantenido en los vertebrados superiores, la clave de su preservación ha sido el poder defender al hospedador sin generar daño en los tejidos propios. <b>Las células reguladoras </b>forman parte del grupo celular encargado de controlar la actividad de los elementos efectores de la respuesta, limitando el daño hacia los tejidos del hospedador, mediando la auto-tolerancia.</font></p>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">Existen varios fenotipos de células reguladoras según el origen: células T reguladoras (Treg) naturales CD4<b><sup>+</sup></b>CD25<b><sup>+</sup></b>Foxp3<b><sup>+</sup> </b>(nTreg), células T reguladoras inducibles CD4<b><sup>+</sup> </b>(iTreg: Tr1 y Th3), células T reguladoras CD8<b><sup>+</sup></b>CD25<b><sup>+</sup> </b>y CD8<b><sup>+</sup></b>CD28<b><sup>-</sup></b>, las células NKT y las células T <i>&#947;&#948;</i>; <b>(ver <a href="#fig1">Figura 1</a>)</b>.</font></p>     <p style="line-height: 100%" align="center"><a name="fig1"> <img border="0" src="/img/fbpe/rvdem/v9n3/art02fig1.gif" width="561" height="526"></a></p> <i>     
<p align="justify" style="line-height: 100%"><font size="2" face="Verdana">nTreg</font></p> </i>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">Desde la descripción de Sakaguchi y col.<b><sup>5</sup> </b>acerca del papel del factor de transcripción Foxp3 en la generación de las células T reguladoras, una ola de investigación y hallazgos concernientes al desarrollo, inmunofenotipos y función de las Treg ha inundado la comunidad científica. El subgrupo de Treg más común es el CD4<b><sup>+</sup></b>CD25<b><sup>+</sup></b>Foxp3<b><sup>+</sup></b>GITR<b><sup>+</sup></b>CTLA-4<b><sup>+</sup></b>CD62L<b><sup>+</sup></b>CD127<b><sup>+</sup></b>OX40L<b><sup>+</sup></b>TNFR2<b><sup>+</sup></b>TGFBR1<b><sup>+</sup></b>LAG3<b><sup>+</sup></b>, capacitado para mediar control sobre la célula blanco, mediante mecanismos célula-célula: TGF-&#946;1 anclado en la membrana de la Treg, vía granzyma/perforina, y mediado por LAG-3<b><sup>6-10</sup></b>. Otros fenotipos de nTreg incluyen: CD4<b><sup>low</sup></b>CD25<b><sup>+</sup></b>Foxp3<b><sup>+</sup></b>LAG3<b><sup>low</sup> </b>(los cuales presentan alta granularidad) y los CD4<b><sup>+</sup> </b>Foxp3<b><sup>+</sup></b>Gadd45&#945;/&#946;<b><sup>+</sup></b>.</font></p> <i>     ]]></body>
<body><![CDATA[<p align="justify" style="line-height: 100%"><font size="2" face="Verdana">iTreg</font></p> </i>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Las células reguladoras inducidas en la periferia dependen del estímulo mediado por citocinas producidas en el nódulo linfático en presencia de actividad antigénica. El primer subtipo, las Tr1 se originan cuando una célula CD4<b><sup>+</sup> </b>naive es estimulada por IL-10, generando una célula CD4<b><sup>+</sup></b>CD25<b><sup>low</sup></b>Foxp3<b><sup>low</sup></b>IL10<b><sup>hi</sup></b>, las cuales producen muy poco TGF-&#946;1 e IFN-&#947; y son capaces de mediar acciones citotóxicas o dependientes de citocinas sobre sus células blanco<b><sup>6-10</sup></b>. <b>Las Th3 </b>aparecen cuando el estímulo sobre la CD4<b><sup>+</sup> </b>naive es el TGF-&#946;1 e IL-4, originando una CD4<b><sup>+</sup></b>CTLA-4<b><sup>+</sup></b>TGF&#946;<b><sup>+</sup></b>, capaz de modular actividad celular mediado por citocinas<b><sup>6-10</sup></b>. Otros inmunofenotipos de iTreg incluyen: CD4<b><sup>+</sup></b>CD25<b><sup>+</sup></b>CTLA-4<b><sup>+</sup></b>Foxp3<b><sup>low</sup></b>GITR<b><sup>low</sup> </b>(inducidas mediante la acción de células dendríticas plasmocitoides sobre CD4<b><sup>+</sup> </b>naive), y CD4<b><sup>+</sup></b>CD25<b><sup>+</sup></b>CTLA-4<b><sup>+</sup></b>Foxp3<b><sup>+</sup></b>GITR<b><sup>+</sup> </b>(originadas de la inducción de CD4<b><sup>+</sup></b>CD25<b><sup>low</sup> </b>con TGF-&#946;1).</font></p> <i>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">CD8</font></i><font size="2" face="Verdana"><b><sup>+</sup> </b></font><i><font size="2" face="Verdana">REGULADORAS</font></p> </i>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Consideradas como las células citotóxicas por excelencia, junto a las <b>NK</b>, su papel como células con potencial regulador se ha reconocido desde hace más de 15 años. Al igual que sus homólogos CD4<b><sup>+</sup></b>, las <b>CD8<sup>+</sup> reguladoras </b>pueden ser naturales o inducidas, con un inmunofenotipo común de CD8<b><sup>+</sup></b>CD25<b><sup>+</sup></b>CD28-CTLA-4<b><sup>+</sup></b>GITR<b><sup>+</sup></b>Foxp3<b><sup>+</sup></b>, las cuales suprimen la respuesta inmune mediante contacto célula-célula o dependiente de citocinas como IL-10/TGF-&#946;1<b><sup>11-15</sup></b>. Otro mecanismo de inducción de CD8<b><sup>+</sup></b>CD25<b><sup>+</sup></b>Foxp3<b><sup>+</sup> </b>es mediante estimulación antigénica continua de monocitos CD14<b><sup>+</sup> <sup>16</sup></b>. Otros subtipos menores incluyen: CD8<b><sup>+</sup></b>CD122<b><sup>+</sup> </b>con características de célula de memoria, y CD8<b><sup>+</sup></b>CXCR3<b><sup>+</sup></b>IL-10<b><sup>+</sup> </b>con actividad supresora de la producción de IFN-&#947;. Dentro del grupo de las iTreg CD8<b><sup>+</sup> </b>tenemos los CD8<b><sup>+</sup></b>CD103<b><sup>+</sup> </b>que son inducidos por aloestimulación durante reacciones injerto vs huésped en presencia de IL-10, IL-4 y TGF-&#946;<b><sup>17</sup></b>, y los CD8<b><sup>+</sup></b>CD103<b><sup>+</sup></b>Foxp3<b><sup>+</sup></b>GITR<b><sup>+</sup></b>CTLA-4<b><sup>+</sup> </b>inducidos por péptidos virales provenientes de virus de la hepatitis C (HCV) y virus de la gripe<b><sup>18</sup></b>.</font></p> <i>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">NKT</font></p> </i>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Las células T &quot;Natural Killer&quot; (NKT) conforman un grupo de linfocitos T, los cuales expresan el receptor &#945;&#946; de célula T que reconoce antígenos lipídicos presentados por el complejo mayor de histocompatibilidad (MHC) clase I CD1d, y marcadores de superficie de NK como el Nk1.1<b><sup>19-21</sup></b>. El subtipo de NKT- I <b>(iNKT) </b>se caracteriza por la expresión de la cadena &#945; invariante del TCR (V&#945;24-J&#945;18) en conjunción con la cadena &#946; V&#946;11, y su ligando prototipo es la &#945;-galactosil-ceramida (presentado por CD1d); el subtipo NKT- II, presenta un amplio repertorio &#945;&#946;TCR, los cuales son capaces de reconocer antígenos lipídicos como los sulfatides pero no reconocen &#945;-galactosil-ceramida. El inmunofenotipo de las iNKT incluye CD62L<b><sup>-</sup></b>CD69<b><sup>+</sup></b>CD44<b><sup>hi</sup></b>IL2RhiCCR2<b><sup>+</sup></b>CCR5<b><sup>+</sup></b>CXCR2<b><sup>+</sup></b>CXCR3<b><sup>+</sup></b>CXCR4<b><sup>+</sup></b>, algunos CD4<b><sup>+</sup> </b>(CCR4<b><sup>+</sup></b>) o doble negativos (CCR1<b><sup>+</sup></b>CCR6<b><sup>+</sup></b>CCL3<b>+</b>CCL20<b><sup>+</sup> </b>[DN]). De acuerdo al gradiente citoquímico presente durante las diferentes fases de la respuesta inflamatoria, ocurrirá la migración de las iNKT CD4<b><sup>+</sup> </b>o DN, funcionando como moduladores de la respuesta de células T helper (secreción de IFN-&#947;, IL-4, IL-5, IL-13 y IL-17) o mediando destrucción de células blanco (células dendríticas o células T efectoras) mediante la vía perforina/granzyma.</font></p> <i>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">CÉLULAS T &#947;&#948;</font></p> </i>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Este subtipo de célula T expresa un receptor TCR con cadenas &#947;&#948;, en vez de las canónicas &#945;&#946; observadas en el resto de las subpoblaciones, las cuales además se consideran nulas para CD4 y CD8<b><sup>22-24</sup></b>. Los antígenos reconocidos por este grupo celular pueden ser péptidos o no peptídicos (alquilamidas y pirofosfatos) presentados por MHC de clase I (MIC-A, -B y CD1d [restringidos como las iNKT]), los cuales pueden incluso no requerir procesamiento por células presentadoras de antígenos. Una vez activadas, son productoras masivas de TNF-&#945; e IFN-&#947;, induciendo la polarización hacia respuesta tipo Th1.</font></p> <b>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">CONTROL DE LA RESPUESTA INMUNE</font></p> </b>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">Como se describió previamente, los diferentes subtipos de células reguladoras poseen mecanismos particulares de control de la</font> <font size="2" face="Verdana">actividad de la célula blanco, ya sea mediante inducción de indolamina 2,3-dioxigenasa (IDO), muerte celular, manipulación de la maduración de la célula dendrítica o por influencia citoquímica <b>(ver <a href="#fig2">Figura 2</a>)</b>. La importancia de estos mecanismos sobre el control de fenómenos de autoinmunidad será explicada a continuación analizando la patogenia de la ETAI.</font></p>     ]]></body>
<body><![CDATA[<p style="line-height: 100%" align="center"><a name="fig2"> <img border="0" src="/img/fbpe/rvdem/v9n3/art02fig2.gif" width="562" height="826"></a></p> <i>     
<p style="line-height: 100%" align="justify"><font size="2" face="Verdana">ENFERMEDAD TIROIDEA AUTOINMUNE (ETAI)</font></p> </i>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Este grupo de enfermedades que afectan la función tiroidea se consideran actualmente como parte de un espectro, donde por un lado predomina una respuesta Th1 (Tiroiditis de Hashimoto) y en el lado opuesto predomina una respuesta Th2 (Enfermedad de Graves). Si bien ambas enfermedades (podría decirse) tienen ciertos locus de predisposición genética comunes (polimorfismos de HLA: DRB1*03 para Graves, y HLA-DR3, HLA-DR4 y HLA-DQw7DQB1*0301 para Hashimoto)<b><sup>25</sup></b>, polimorfismos de CTLA-4, AIRE, PTPN22, tiroglobulina (Tg), peroxidasa tiroidea (TPO) y receptor de TSH<b><sup>26-28</sup></b>, inclusive polimorfismos de Foxp3<b><sup>29</sup></b>, las manifestaciones clínicas y el pronóstico de estas enfermedades es totalmente opuesto. Se han planteado varias hipótesis para explicar esta variación, tomando en consideración diversos factores ambientales como la ingesta de yodo<b><sup>30</sup></b>, polimorfismos del transportador Na<b><sup>+</sup></b>/I<b><sup>-</sup> <sup>31</sup></b>, y otros, pero no ha sido suficiente para explicar la amplia variedad de manifestaciones en el espectro. De acuerdo a la información actual, uno de los mecanismos propuestos es la pérdida de regulación de las células Treg.</font></p>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Marazuela y col.<b><sup>32</sup> </b>realizaron un ensayo clínico en el cual caracterizaron las Treg CD4<b><sup>+</sup> </b>de pacientes con ETAI, tanto en sangre como en biopsias tiroideas. Este grupo reporta que los niveles de CD4<b><sup>+</sup></b>GITR<b><sup>+</sup></b>, CD4<b><sup>+</sup></b>Foxp3<b><sup>+</sup></b>, CD4<b><sup>+</sup> </b>sintetizadoras de IL-10 o TGF-&#946; fueron significativamente mayores en pacientes con ETAI en comparación con sujetos normales; sin embargo, no se evidenció diferencia en los niveles de dichos subtipos celulares entre pacientes con tiroiditis de Hashimoto (TH) y aquellos con enfermedad de Graves (EG); estos hallazgos son concordantes con otro ensayo en pacientes con EG donde tampoco se encontró déficit de Tregs<b><sup>33</sup></b>. Al enfrentar las Treg con anticuerpos neutralizantes in vitro, se observó que las Treg presentaban defectos al momento de ejercer su función supresora, probablemente debido a refractariedad de las células efectoras blanco o por incremento en la expresión de GITRL<b><sup>34</sup></b>, el cual se ha reconocido como capaz de abolir la actividad supresora de las Treg, incrementando a su vez su vida media.</font></p>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">Al año siguiente, McLachlan y col.<b><sup>35</sup> </b>publican sus resultados utilizando un modelo animal que permitía evaluar la progresión de EG hacia TH analizando la expansión de los epítopes antigénicos durante la evolución de la enfermedad. Utilizando un modelo transgénico que expresa la subunidad-A del receptor de TSH humano (TSHrA), evidenciaron que la progresión de EG hacia TH depende del número y función de las Treg, especialmente manipulando el cambio de epítope hacia aquellos crípticos como TPO y Tg. La depleción experimental de CD4<b><sup>+</sup></b>CD25<b><sup>+</sup> </b>generó tiroiditis moderada incluso antes de la inmunización con TSHr/Subunidad-A como antígeno, y posterior a la inmunización se obtuvo una tiroiditis</font></p>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">severa (~80% de la glándula) que progresó a hipotiroidismo franco. Una vez desencadenada la destrucción tiroidea, aparecieron autoanticuerpos para TPO y Tg, lo cual concuerda con la progresión observada en algunos casos humanos. A pesar de comprobar que las Treg modulan la protección contra la aparición de nuevos epítopes propios y controla la progresión de la autoinmunidad tiroidea, en este estudio no se pudo concluir cuál era la causa del defecto en este grupo celular.</font></p>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Los trabajos anteriormente mencionados (entre otros<b><sup>36-37</sup></b>), plantean que las Treg son fundamentales en la patogenia de autoinmunidad tiroidea, caracterizándose por defectos en su función supresora pudiendo estar acompañado de disminución en su número<b><sup>38</sup></b>. Ahora bien, que significa que una célula Treg sea defectuosa? Kriegel y col.<b><sup>39</sup> </b>evaluaron estas características en células obtenidas de pacientes con síndrome poliglandular autoinmune (SPA) tipo II, demostrando que las Treg de dichos pacientes tenían un buen número de células, con marcadores de superficie que indicaban madurez, pero eran incapaces de modular la proliferación celular, datos que son similares a los del grupo de Marazuela. Sin embargo, el grupo Alemán no encontró incremento en GITR<b><sup>39</sup></b>. Varios han avalado el papel de éste receptor en la inhibición de la actividad de las Treg<b><sup>40-42</sup></b>, por lo que es tentador plantear que los defectos observados en ETAI puedan deberse a activación continua del receptor por ligandos sintetizados en las células presentadoras de antígeno (APC) locales, y por el tiroidocito, especialmente cuando el mismo receptor es activador de las células efectoras, con liberación de citocinas Th1, lo que parcialmente explicaría la progresión del daño tisular tiroideo. De hecho, modelos animales GITR<b><sup>-/-</sup> <sup>43-45</sup> </b>o tratados con anticuerpos monoclonales anti-GITR<b><sup>46-47</sup> </b>están protegidos contra fenómenos de autoinmunidad, asociado a la falta de inducción de una respuesta Th1, con implicaciones incluso como terapia adyuvante oncológica. A pesar de la evidencia antes descrita, van Olffen y col.<b><sup>48</sup> </b>reportan que GITR ligando es un inductor directo de CD4<b><sup>+</sup> </b>reguladoras, pero no CD8<b><sup>+</sup> </b>reguladoras, siendo este efecto mediado por la producción de IL-2; por ende, los autores finalizan proponiendo que GITR ligando es factor de proliferación de Treg.Otro candidato a la modulación de la actividad de Treg, es el ligando inductor de apoptosis relacionado con TNF (TRAIL), el cual ha acumulado evidencia controversial suficiente sobre su papel en autoinmunidad. En los últimos 15 años, experimentos en modelos animales para diabetes tipo 1<b><sup>49</sup></b>, artritis reumatoidea<b><sup>50</sup> </b>y tiroiditis autoinmune experimental<b><sup>51</sup> </b>han demostrado que el silenciamiento genético del TRAIL y su aplicación exógena en fases preclínicas y clínicas de enfermedad autoinmune, controlan y son capaces de revertir la progresión de la misma, a través de la inducción de CD4<b><sup>+</sup></b>CD25<b><sup>+</sup></b>CD45RB<b><sup>low</sup> </b>productoras de IL-10, TGF-&#946;1, con capacidad supresora conservada, llegándose a proponer un mecanismo de control antiinflamatorio entre células epiteliales tiroideas y células inflamatorias<b><sup>52</sup></b>. Sin embargo, Ikeda y col.<b><sup>53</sup> </b>publican el año pasado que los efectos de TRAIL sobre Treg y células tiroideas dependen del tipo de receptor estimulado y la presencia de receptores tipo <i>&quot;decoy&quot; </i>o señuelo (receptor de evasión). TRAIL tiene dos receptores naturales, receptor de muerte 4 y 5 (DR4 y DR5), y 3 receptores decoy, DcR1 (no tiene dominio citoplasmático), DcR2 (dominio de muerte truncado) y DcR3 (actividad supresora de vías de FasL). Los datos de Ikeda proponen entonces que según el juego de concentraciones de receptores reales y sus decoy podrían modular la actividad de TRAIL sobre Treg, lo cual explica los hallazgos de Xiao y col.<b><sup>54</sup> </b>en la cual se observó incremento en la expresión y secreción de TRAIL en células T efectoras, acompañado de apoptosis de Treg a partir de muestras de pacientes con artritis reumatoidea. La apoptosis inducida por TRAIL no es exclusiva para las Treg. Se ha demostrado muerte celular en células foliculares tiroideas mediado por TRAIL/DR5 en presencia de exceso yodo en modelos de tiroiditis autoinmune experimental<b><sup>55</sup></b>. Finalmente, IFN-&#947; y TNF-&#945; son capaces de inducir la expresión del receptor DR5 en células epiteliales tiroideas, lo cual la hace sensibles a los efectos apoptóticos de TRAIL<b><sup>56</sup></b>.</font></p>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">Existen otras posibilidades a ser tomadas en cuenta con respecto al defecto supresor observado en la ETAI, tal es el caso de la esfingosina-1-fosfato (S1P), PKC&#952;, y la disfunción de las APC. La S1P, metabolito esfingolípido activo producto de la esfingosina kinasa, es una molécula de señalización intracelular asociada con metabolismo de calcio intracelular, degranulación de polimorfonucleares y mastocitos, movimiento celular, inhibidor de la apoptosis, e involucrada en la termotolerancia<b><sup>57-59</sup></b>. Para el sistema inmune, la S1P es la molécula fundamental para la salida del timo y homing adecuado de los timocitos<b><sup>60</sup></b>. Utilizando enfoques elegantes de adquisición y pérdida de función de genes, Liu y col.<b><sup>61</sup> </b>han reportado que S1P, a través de su receptor acoplado a proteína G S1P</font><font size="2" face="Verdana"><sub>1</sub>, es capaz de suprimir la diferenciación y actividad supresora de Treg, a través de la vía Akt-mTOR, lo cual ofrece un nuevo panorama a las posibilidades de intervención a través de la modulación de esta vía. La proteína kinasa &#952; es punto clave en la cascada de activación de las células T, vía TCR <b><sup>62</sup></b>, aunque su papel en la proliferación y actividad de las Treg es controversial. Gupta y col.<b><sup>63</sup> </b>publicaron en 2009 que la PKC&#952; es esencial para la proliferación y diferenciación de Treg, mediante la inducción de Foxp3 vía calcineurina/NFAT. Zanin-Zhorov y col.<b><sup>64</sup> </b>publican que la enzima es secuestrada lejos del área de la sinapsis inmunológica durante la activación de las Treg, y el bloqueo de la misma en modelos in vitro incrementa la actividad de las Treg, sugiriendo que durante la inducción de la actividad supresora ésta enzima actúa de forma antagónica. Se propone que la modulación de PKC&#952;, es un posible blanco terapéutico en autoinmunidad, especialmente porque es uno de los mediadores cascada abajo del TNF-&#945;<b><sup>65</sup></b>. Por último, se encuentra la disfunción de las APC la cual fue correlacionada con el grado de actividad supresora de las Treg en pacientes con diabetes tipo 1<b><sup>66</sup></b>. Este grupo observó que si bien, en autoinmunidad se observan defectos en la activación de Treg, parte del problema se localiza en la actividad de las APC a la hora de inducirlas, originando una muy baja actividad supresora por parte de Treg (menos del 25%) en ~40% de los pacientes analizados.</font></p>     <p align="justify" style="line-height: 100%"><b><font size="2" face="Verdana">PERSPECTIVAS</font></b></p>     <p style="line-height: 100%" align="justify"><font size="2" face="Verdana">No cabe duda que las células reguladoras son un punto clave en la patogenia de las enfermedades autoinmunes, y en el caso presentado en esta revisión, el problema no es solamente de expansión, también deben analizarse desde un punto de vista funcional. Las Treg son quizá las células más importantes en el grupo, pero eso no significa que sean las únicas alteradas en la ETAI. Por ejemplo, recientemente se publicó que iNKT pueden autopresentar Tg sin necesidad de presentación antigénica por parte de una APC, asociado a la producción exagerada de IFN-&#947; y/o TNF-&#945;, lo que polariza la respuesta hacia Th1 en modelo animal de tiroiditis autoinmune inducido por yodo<b><sup>67</sup></b>. Las células T &#947;&#948; están relacionadas con el balance Th1/Th17 lo cual es fundamental para la progresión de la tiroiditis experimental. Las CD4<b><sup>+</sup> </b>&#947;&#948; bajo la influencia de IL-1&#946; e IL-23 pueden secretar IL-17, IL-21 e IL-22, lo cual polariza el desarrollo de Tnaive hacia Th17, células patogénicas en autoinmunidad<b><sup>68</sup> </b>y especialmente en la progresión de la TH<b><sup>69</sup> </b>y en la refractariedad de la EG<b><sup>70</sup></b>. Finalmente, la frecuencia de poblaciones CD8<b><sup>+</sup></b>CD25<b><sup>+</sup> </b>junto a la aparición progresiva de autoanticuerpos, se correlacionan con la severidad de la TH<b><sup>71</sup></b>. Con toda esta información, no queda más que plantear un esquema de eventos que se suscitan en el espectro de la ETAI y que permiten dar entendimiento a esta complicada enfermedad</font> <font SIZE="2"><b><font size="2" face="Verdana">(<a href="#fig3">Figura 3</a>).</font></b></font></p>     ]]></body>
<body><![CDATA[<p style="line-height: 100%" align="center"><a name="fig3"> <img border="0" src="/img/fbpe/rvdem/v9n3/art02fig3.gif" width="579" height="356"></a></p>     
<p align="justify" style="line-height: 100%"><font size="2" face="Verdana">A pesar de la vasta información existente y de las evidencias experimentales reportadas, aún quedan muchas interrogantes por responder: ¿Por qué los autoanticuerpos para TPO aparecen después de Tg? ¿Por qué hay pacientes positivos para ellos sin evidencia de destrucción glandular severa? ¿Qué impide el daño tisular en los cuadros de hipertiroidismo o hipotiroidismo subclínicos con autoanticuerpos positivos y glándula preservada? ¿Cuáles son las conexiones fisiopatológicas precisas entre ETAI y diabetes tipo 1, y con ellos el resto de los SPA?</font></p>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Uno de los retos más importantes es comprender el sistema de control apoptótico entre las Treg, las T efectoras y los tiroidocitos. Es menester evaluar la expresión de los DR4, DR5 y los decoy en biopsias de pacientes con TH y EG, ya que eso permitirá esclarecer el patrón de muerte según la polarización de Th en la cual se encuentre el paciente. Como se muestra en la <b><a href="#fig3">Figura 3</a></b>, se propone que existe una modulación en la expresión y localización de DR4/5 y decoys tanto en Treg como en tiroidocitos lo que pudiera explicar la variabilidad clínica en la ETAI; teoría que concuerda con lo observado en líneas cancerosas resistentes a apoptosis, en las cuales se ha observado que el tratamiento con TRAIL modifica la distribución de los receptores en las balsas lipídicas y altera su sensibilidad a la apoptosis mediada por el ligando<b><sup>72</sup></b>. Además, sería interesante evaluar la capacidad de TRAIL de disminuir la expresión de cFLIP en tiroidocitos, dando respuestas al perfil apoptótico antagónico entre TH y EG<b><sup>73</sup></b>. Por último, evaluar la actividad de S1P dentro del espectro de la inmunopatogenia, a la luz de su efecto sobre las Treg, debido a que ya existe evidencia de su papel oncogénico en el cáncer tiroideo<b><sup>74</sup> </b>asociándose a un fenotipo pro-migratorio (metastásico) dependiente de PKC&#945; y ERK1/2, y su influencia en otras enfermedades autoinmunes como el Síndrome de Sjögren<b><sup>75</sup></b>.</font></p>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">Todos los sistemas fisiológicos tienen una doble cara: en exceso y en ausencia. Para el caso de la ETAI es probable que además de la herencia y los factores ambientales, exista un funcionamiento defectuoso de las células reguladoras, lo que para el caso de TH eterniza la polarización hacia Th1, mientras que en EG mantenga una polarización Th2. Utilizar la analogía del dios Janus para explicar duplicidad en eventos de una misma vía metabólica, etiología, o manifestación clínica, es un buen ejemplo para demostrar que no hay absolutos, todo depende hacia donde se desplace la balanza de la transición.</font></p> <b>     <p align="justify" style="line-height: 100%"><font size="2" face="Verdana">REFERENCIAS BIBLIOGRÁFICA</font></b><font size="2" face="Verdana">S</font></p>     <!-- ref --><p align="justify" style="line-height: 100%"><font size="2" face="Verdana">1. Hardie P. The Janus Episode in Ovid´s Fasti. 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