<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932016000200007</article-id>
<article-id pub-id-type="doi">10.17533/udea.iatreia.v29n2a07</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Inmunorregulación inducida por helmintos: una actualización]]></article-title>
<article-title xml:lang="en"><![CDATA[Helminth-induced immunoregulation: an update]]></article-title>
<article-title xml:lang="pt"><![CDATA[Imunorregulação induzida por helmintos: uma atualização]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zakzuk]]></surname>
<given-names><![CDATA[Josefina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Cartagena  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>29</volume>
<numero>2</numero>
<fpage>182</fpage>
<lpage>193</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932016000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932016000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932016000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Las helmintiasis, que han desaparecido o disminuido en las regiones más desarrolladas del mundo, producen cambios notables en el sistema inmunológico, y usualmente, cuando son crónicas o intensas, causan inmunosupresión. Aunque deterioran la salud, también parecen proteger del desarrollo de enfermedades inflamatorias crónicas al proveer estímulos inmunorreguladores. Promueven el desarrollo de linfocitos B o T reguladores que inhiben la proliferación de clones autorreactivos o específicos de alérgeno. Cada vez se conoce más la modulación de la respuesta innata por parásitos; se destaca que además de aumentar en número células claves en la defensa contra estos, también pueden usarlas como blanco de evasión. Algunas poblaciones importantes en la defensa contra bacterias y otros patógenos también responden a los helmintos, pero sufren una programación genética diferente a las formas asociadas a la respuesta tipo 1. Paralelamente a la inmunosupresión, las helmintiasis inducen una respuesta tipo 2. Por esto, es preocupante lo que sucede en algunas poblaciones en donde se controlan parcialmente estas parasitosis y predominan los ciclos de infestación ligera/reinfección. En estos contextos, algunos helmintos, como Ascaris lumbricoides, parecen promover el desarrollo de alergias; esta es la helmintiasis más común en el planeta, pero de la que menos se sabe sobre su capacidad inmunorreguladora.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Helminth infections, which have been reduced or eradicated from most developed countries, produce important changes in the immune system. Especially, when chronic and intense, they cause immunosuppression. Although parasites can directly impair health, they may also protect from chronic inflammatory diseases due to induction of immunoregulatory mechanisms, such as regulatory-B and -T cell development which inhibit proliferation of auto-reactive and allergen-specific clones. Innate immune system modulation has also been recognized, highlighting that, besides increasing the number of cells involved in parasite clearance, they also may use them as a target for evasion mechanisms. Some cells, important in the defense against bacteria and other pathogens, also respond to helminths, but with a genetic program highly different from the type-1 classical profile. Parallel to immunosuppression, helminthiasis induce strong type 2 responses in the host; thus, it becomes a concern the situation of some human populations living in places where they are partially controlled, then, slight infection/re-infection cycles prevail and immunosuppression is rather not observed. Ascaris lumbricoides, the most common helminthiasis in the planet, is one of the least studied in terms of immunoregulation and also the most frequently associated to asthma and other allergic conditions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[As helmintíases, que desapareceu ou diminuiu nas regiões mais desenvolvidas do mundo, produzem mudanças perceptíveis no sistema imune, e geralmente, quando eles são crônicos ou intensa, causa imunossupressão. Embora deteriora a saúde, também aparecem para proteger o desenvolvimento de doenças inflamatórias crônicas, ao fornecer estímulos imunorreguladores. Promover o desenvolvimento dos linfócitos B ou T reguladores que inibem a proliferação de clones auto-reativos ou alérgeno específico. Cada vez se conhece mais a modulação da resposta inata de parasitas; disse que, além de aumentar o número células importantes na defesa contra estes, também pode ser usado como um alvo de evasão. Algumas populações importantes na defesa contra as bactérias e outros agentes patogênicos que também respondem aos helmintos, mas sofre de uma programação genética de diferentes formas associadas com a resposta do tipo 1. Em paralelo à imunossupressão e infecções helmínticas induzem uma resposta tipo 2. Por este motivo, é preocupante o que acontece em algumas populações onde é controlado parcialmente esses parasitas e dominam os ciclos de infestação leve/reinfecção. Em tais contextos, alguns helmintos, como, por exemplo, o Ascaris lumbricoides, parecem promover o desenvolvimento de alergias; esta é a mais comum infecção por helmintos do planeta, mas menos se sabe sobre sua capacidade imunorreguladora.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ascaris lumbricoides]]></kwd>
<kwd lng="es"><![CDATA[Helmintiasis]]></kwd>
<kwd lng="es"><![CDATA[Inmunomodulación]]></kwd>
<kwd lng="es"><![CDATA[Inmunosupresión]]></kwd>
<kwd lng="en"><![CDATA[Ascaris Lumbricoides]]></kwd>
<kwd lng="en"><![CDATA[Helminthiasis]]></kwd>
<kwd lng="en"><![CDATA[Immunomodulation]]></kwd>
<kwd lng="en"><![CDATA[Immunosuppression]]></kwd>
<kwd lng="pt"><![CDATA[Ascaris lumbricoides]]></kwd>
<kwd lng="pt"><![CDATA[Helmintiasis]]></kwd>
<kwd lng="pt"><![CDATA[Imunomodulação]]></kwd>
<kwd lng="pt"><![CDATA[Imunossupressão]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif">DOI <a href="http://dx.doi.org/10.17533/udea.iatreia.v29n2a07" target="_blank">10.17533/udea.iatreia.v29n2a07</a></font></p> <font size="2" face="Verdana, Arial, Helvetica, sans-serif">    <p align="right">&nbsp;</p>     <p align="right">&nbsp;</p>     <p align="right"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></p>     <p>&nbsp;</p>     <p align="center"><font size="4"><b>Inmunorregulaci&oacute;n inducida por helmintos: una actualizaci&oacute;n</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="3"><b>Helminth-induced immunoregulation: an update</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="3"><b>Imunorregula&ccedil;&atilde;o induzida por helmintos: uma atualiza&ccedil;&atilde;o</b></font></p>     ]]></body>
<body><![CDATA[<p align="center">&nbsp;</p>     <p align="center">&nbsp;</p>     <p><b>Josefina Zakzuk<sup>1</sup></b></p>     <p>&nbsp;</p>     <p>1 MD, PhD. Doctorado en Ciencias Biom&eacute;dicas. Investigadora del Grupo de Alergolog&iacute;a Experimental e Inmunogen&eacute;tica. Docente de planta, Instituto de Investigaciones Inmunol&oacute;gicas Universidad de Cartagena, Colombia. <a href="mailto:jzakzuks@unicartagena.edu.co">jzakzuks@unicartagena.edu.co</a></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p> Recibido: marzo 2 de 2015    <br>   Aceptado: mayo 12 de 2015</p>       <p>&nbsp;</p>       ]]></body>
<body><![CDATA[<p>&nbsp;</p>   <hr size="1" />     <p><b>RESUMEN</b></p>       <p>Las helmintiasis, que han desaparecido o disminuido en las regiones m&aacute;s desarrolladas del   mundo, producen cambios notables en el sistema inmunol&oacute;gico, y usualmente, cuando son   cr&oacute;nicas o intensas, causan inmunosupresi&oacute;n. Aunque deterioran la salud, tambi&eacute;n parecen   proteger del desarrollo de enfermedades inflamatorias cr&oacute;nicas al proveer est&iacute;mulos inmunorreguladores.   Promueven el desarrollo de linfocitos B o T reguladores que inhiben la proliferaci&oacute;n   de clones autorreactivos o espec&iacute;ficos de al&eacute;rgeno. Cada vez se conoce m&aacute;s la modulaci&oacute;n   de la respuesta innata por par&aacute;sitos; se destaca que adem&aacute;s de aumentar en n&uacute;mero   c&eacute;lulas claves en la defensa contra estos, tambi&eacute;n pueden usarlas como blanco de evasi&oacute;n.   Algunas poblaciones importantes en la defensa contra bacterias y otros pat&oacute;genos tambi&eacute;n   responden a los helmintos, pero sufren una programaci&oacute;n gen&eacute;tica diferente a las formas asociadas   a la respuesta tipo 1. Paralelamente a la inmunosupresi&oacute;n, las helmintiasis inducen una   respuesta tipo 2. Por esto, es preocupante lo que sucede en algunas poblaciones en donde se   controlan parcialmente estas parasitosis y predominan los ciclos de infestaci&oacute;n ligera/reinfecci&oacute;n.   En estos contextos, algunos helmintos, como <i>Ascaris lumbricoides</i>, parecen promover el   desarrollo de alergias; esta es la helmintiasis m&aacute;s com&uacute;n en el planeta, pero de la que menos   se sabe sobre su capacidad inmunorreguladora.</p>       <p><b>PALABRAS CLAVE</b></p>       <p><i>Ascaris lumbricoides, Helmintiasis, Inmunomodulaci&oacute;n, Inmunosupresi&oacute;n </i></p>   <hr size="1" />       <p><b>SUMMARY</b></p>     <p>Helminth infections, which have been reduced or eradicated from most developed countries, produce important changes in the immune system. Especially, when chronic and intense, they cause immunosuppression. Although parasites can directly impair health, they may also protect from chronic inflammatory diseases due to induction of immunoregulatory mechanisms, such as regulatory-B and -T cell development which inhibit proliferation of auto-reactive and allergen-specific clones. Innate immune system modulation has also been recognized, highlighting that, besides increasing the number of cells involved in parasite clearance, they also may use them as a target for evasion mechanisms. Some cells, important in the defense against bacteria and other pathogens, also respond to helminths, but with a genetic program highly different from the type-1 classical profile. Parallel to immunosuppression, helminthiasis induce strong type 2 responses in the host; thus, it becomes a concern the situation of some human populations living in places where they are partially controlled, then, slight infection/re-infection cycles prevail and immunosuppression is rather not observed.   <i>Ascaris lumbricoides</i>, the most common helminthiasis in the planet, is one of the least studied in terms of immunoregulation and also the most frequently associated to asthma and other allergic conditions.</p>     <p><b>KEY WORDS  </b></p>     <p><i>Ascaris Lumbricoides, Helminthiasis, Immunomodulation,   Immunosuppression</i></p>   <hr size="1" />      <p><b>RESUMO</b></p>     ]]></body>
<body><![CDATA[<p>As helmint&iacute;ases, que desapareceu ou diminuiu nas regi&otilde;es   mais desenvolvidas do mundo, produzem mudan&ccedil;as   percept&iacute;veis no sistema imune, e geralmente,   quando eles s&atilde;o cr&ocirc;nicos ou intensa, causa imunossupress&atilde;o.   Embora deteriora a sa&uacute;de, tamb&eacute;m aparecem   para proteger o desenvolvimento de doen&ccedil;as   inflamat&oacute;rias cr&ocirc;nicas, ao fornecer est&iacute;mulos imunorreguladores.   Promover o desenvolvimento dos   linf&oacute;citos B ou T reguladores que inibem a prolifera&ccedil;&atilde;o   de clones auto-reativos ou al&eacute;rgeno espec&iacute;fico.   Cada vez se conhece mais a modula&ccedil;&atilde;o da resposta   inata de parasitas; disse que, al&eacute;m de aumentar o   n&uacute;mero c&eacute;lulas importantes na defesa contra estes,   tamb&eacute;m pode ser usado como um alvo de evas&atilde;o. Algumas popula&ccedil;&otilde;es importantes na defesa contra as bact&eacute;rias e outros agentes patog&ecirc;nicos que tamb&eacute;m respondem aos helmintos, mas sofre de uma programa&ccedil;&atilde;o gen&eacute;tica de diferentes formas associadas com a resposta do tipo 1. Em paralelo &agrave; imunossupress&atilde;o e infec&ccedil;&otilde;es helm&iacute;nticas induzem uma resposta tipo 2. Por este motivo, &eacute; preocupante o que acontece em algumas popula&ccedil;&otilde;es onde &eacute; controlado parcialmente esses parasitas e dominam os ciclos de infesta&ccedil;&atilde;o leve/reinfec&ccedil;&atilde;o. Em tais contextos, alguns helmintos, como, por exemplo, o <i>Ascaris lumbricoides</i>, parecem promover o desenvolvimento de alergias; esta &eacute; a mais comum infec&ccedil;&atilde;o por helmintos do planeta, mas menos se sabe sobre sua capacidade imunorreguladora.</p>     <p><b>PALAVRAS CHAVE  </b></p>     <p><i>Ascaris lumbricoides, Helmintiasis, Imunomodula&ccedil;&atilde;o,   Imunossupress&atilde;o</i></p>       <p>&nbsp;</p>     <p><b>C&oacute;mo citar:</b> Zakzuk-J. Inmunorregulaci&oacute;n inducida por helmintos: una actualizaci&oacute;n. Iatreia. 2016 Abr-Jun;29&#40;2&#41;:182-193. DOI <a href="http://dx.doi.org/10.17533/udea.iatreia.v29n2a07" target="_blank">10.17533/udea.iatreia.v29n2a07</a>.</p> <hr size="1" />     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3"><b>INTRODUCCI&Oacute;N</b></font></p>       <p>La inmunorregulaci&oacute;n es un tema de inter&eacute;s cient&iacute;fico   actual dado el aumento global de las enfermedades   inflamatorias cr&oacute;nicas &#40;EIC&#41;. Algunos proponen   que la causa de este aumento es de origen ambiental,   pues se est&aacute; dando de forma acelerada, paralela a   cambios importantes en las condiciones de sanidad   de las poblaciones y al creciente urbanismo con sus problemas asociados &#40;1&#41;, entre otros.</p>       <p> Hoy en d&iacute;a las capacidades tecnol&oacute;gicas disponibles   han permitido un sinn&uacute;mero de hallazgos que no   eran posibles hace dos d&eacute;cadas. Como era de esperar,   muchos paradigmas han cambiado a lo largo de   los a&ntilde;os. Las hip&oacute;tesis asociadas a la inmunorregulaci&oacute;n   han ido evolucionando tambi&eacute;n de acuerdo   con los descubrimientos de poblaciones celulares y   sus funciones. En la d&eacute;cada de los a&ntilde;os 80, la versi&oacute;n   original de la hip&oacute;tesis de la higiene &#40;2&#41;, en la cual se   propon&iacute;a que las infecciones microbianas proteg&iacute;an   del desarrollo de las alergias se adaptaba muy bien a   la descripci&oacute;n de los subtipos Th1 y Th2 de linfocitos   T CD4+ &#40;3&#41;. La contrarregulaci&oacute;n que ejerc&iacute;a la polarizaci&oacute;n   de la respuesta Th1, estimulada por infecciones    de la respuesta Th2 y el desarrollo de atopia   en las personas expuestas. La debilidad de la hip&oacute;tesis original es que no explica el porqu&eacute; del aumento de las alergias en otras partes del mundo, donde todav&iacute;a se mantienen condiciones precarias de saneamiento b&aacute;sico e higiene, y por otra parte, que tambi&eacute;n han aumentado las EIC asociadas a la respuesta Th1, como las autoinmunes. De igual manera, una mejor descripci&oacute;n del tipo de respuesta que produc&iacute;an los helmintos en los ni&ntilde;os gaboneses plante&oacute; m&aacute;s preguntas a la comunidad cient&iacute;fica. Las infecciones helm&iacute;nticas, aunque estimulan intensamente la respuesta Th2/IgE, pueden proteger, en algunos contextos, del desarrollo de atopia. El descubrimiento de mecanismos que suprimen tanto las respuestas Th1 y Th2 como otras subpoblaciones proinflamatorias &#40;Th17&#41;, inducidos, entre algunos otros factores por las helmintiasis, acab&oacute; con esta aparente contradicci&oacute;n.</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>       <p><font size="3"><b>HELMINTOS E INMUNORREGULACI&Oacute;N </b></font></p>       <p>Desde antes de la hip&oacute;tesis de la higiene, Greenwood &#40;4&#41;     hab&iacute;a planteado una asociaci&oacute;n inversa entre enfermedades     autoinmunes y helmintiasis en Nigeria. No     obstante, la investigaci&oacute;n y las corrientes de pensamiento     que guiaron los planteamientos sobre inmunomodulaci&oacute;n   &#40;sobre todo en las alergias&#41; se enfocaban     en infecciones virales y bacterianas, lo cual     es m&aacute;s ajustado a los agentes de importancia en los     pa&iacute;ses templados, de donde se deriv&oacute; la hip&oacute;tesis de     la higiene &#40;2&#41;. Una de las mayores contradicciones observadas     era que las infecciones helm&iacute;nticas causan     una fuerte inmunosupresi&oacute;n, pero al mismo tiempo     estimulan la respuesta Th2/IgE. Hoy sabemos que los     helmintos inducen varios mecanismos de inmunorregulaci&oacute;n     y que pueden disminuir reacciones inflamatorias     que causan manifestaciones cl&iacute;nicas, tanto de     hipersensibilidad tipo 1 como enfermedades autoinmunes   &#40;5&#41;.    </p>       <p>Las helmintiasis todav&iacute;a son frecuentes en la humanidad,     principalmente en las regiones socioecon&oacute;micamente     vulnerables &#40;6&#41;. Aunque para su erradicaci&oacute;n     sean suficientes cambios sociopol&iacute;ticos que     mejoren las condiciones sanitarias, el entendimiento     de la respuesta inmune que desencadenan los helmintos,     adem&aacute;s de interesante, es &uacute;til en varios aspectos     de la medicina. Los helmintos inducen en el     hospedero una forma de respuesta inmune tipo 2 &#40;de     origen y desarrollo poco entendidos&#41; parecida a la     al&eacute;rgica. Simult&aacute;neamente promueven una respuesta     antinflamatoria mediante diferentes mecanismos     que pueden ser &uacute;tiles en el tratamiento de las EIC &#40;5&#41;.</p>       <p> Actualmente hay en el planeta tres escenarios distintos     en cuanto a la influencia de las helmintiasis en el     sistema inmunol&oacute;gico. En los pa&iacute;ses end&eacute;micos, la inmunosupresi&oacute;n     que causan tiene un impacto negativo     sobre enfermedades emergentes y la eficacia de la     vacunaci&oacute;n &#40;7,8&#41;. Por otra parte, en los pa&iacute;ses desarrollados     su erradicaci&oacute;n parece estar relacionada con el     aumento de las EIC y por esta raz&oacute;n hay bastante inter&eacute;s     en aislar mol&eacute;culas derivadas de helmintos que     puedan reemplazar el est&iacute;mulo de inmunorregulaci&oacute;n     que confieren naturalmente. Se puede tambi&eacute;n     tomar como particular lo que est&aacute; sucediendo en los     pa&iacute;ses que se encuentran en una etapa de transici&oacute;n     econ&oacute;mica &#40;la mayor&iacute;a de los latinoamericanos, por     ejemplo&#41;, en donde hay menores prevalencias de helmintiasis,     un acceso parcial a campa&ntilde;as de desparasitaci&oacute;n     y persistencia de condiciones precarias de     sanidad en una parte importante de la poblaci&oacute;n, las     cuales perpet&uacute;an el ciclo de vida del par&aacute;sito y permiten     la reinfecci&oacute;n. En este sentido, no est&aacute;n presentes     las consecuencias de la infecci&oacute;n cr&oacute;nica, los est&iacute;mulos     Th2 persisten y podr&iacute;an as&iacute; aumentar el riesgo de     <p>&nbsp;</p>       <p><font size="3"><b>POBLACIONES CELULARES</b></font></p>       <p>Las formas de parasitismo de los helmintos son variadas     y de igual manera lo son las respuestas del hospedero     a la invasi&oacute;n. En este sentido, de una manera     estricta no se puede generalizar sobre los efectos de     los helmintos en la respuesta inmunol&oacute;gica a partir     del hallazgo obtenido con una especie; sin embargo,     hay poblaciones celulares que est&aacute;n ampliamente     relacionadas con la infecci&oacute;n por helmintos independientemente     del tipo de par&aacute;sito. Los linfocitos T     reguladores &#40;Treg&#41; son un buen ejemplo de este tipo     de blanco del sistema inmunol&oacute;gico que tienen los     helmintos &#40;10&#41;. Para otras poblaciones descritas de     manera m&aacute;s reciente, tales como los linfocitos B reguladores,     se necesitan m&aacute;s estudios en diferentes     contextos de infecci&oacute;n para conocer la universalidad     del efecto inmunomodulador &#40;11&#41;. Asimismo, se conocen     cada vez con m&aacute;s detalle los efectos sobre la     respuesta innata y su conexi&oacute;n con la modulaci&oacute;n de     la respuesta adaptativa &#40;<a href="img/revistas/iat/v29n2/v29n2a07f1.jpg" target="_blank">figura 1</a>&#41;. </p> 	       <p><b>C&eacute;lulas linfoides</b></p>       <p><i>Linfocitos T reguladores    </i></p>       ]]></body>
<body><![CDATA[<p>Es amplia la evidencia cient&iacute;fica que respalda el efecto     inductor de varias helmintiasis sobre los Treg &#40;10,12&#41;.     Adem&aacute;s del fenotipo cl&aacute;sico de los Treg provenientes     del timo &#40;CD4<sup>+</sup>CD25<sup>+</sup>FOXP3<sup>+</sup>&#41; se han descrito otras     poblaciones circulantes productoras de IL-10 &#40;Tr1&#41; o     TGF-&#946; &#40;10,13&#41;. Tambi&eacute;n se ha demostrado que los Treg     inducidos por par&aacute;sitos tienen capacidad inmunosupresora     sobre otras poblaciones de linfocitos T &#40;14&#41;. La     secreci&oacute;n de IL-10 o TGF-&#946; es un mecanismo inmunorregulador     preponderante en algunas infecciones, al     igual que la expresi&oacute;n de mol&eacute;culas, como el ant&iacute;geno     4 del linfocito T citot&oacute;xico &#40;CTLA-4&#41; o el miembro 19     de la superfamilia del receptor de factor de necrosis     tumoral &#40;GITR&#41;, que act&uacute;an mediante el contacto     c&eacute;lula-c&eacute;lula &#40;15,16&#41;.</p>       <p> Los helmintos pueden expandir Treg perif&eacute;ricos, lo     que les permite modificar en el hospedero caracter&iacute;sticas     del sistema inmune aparte de las que ya     vienen determinadas desde el proceso central de     tolerancia. Usando mol&eacute;culas o productos excretados/     secretados &#40;E/S&#41; de par&aacute;sitos se ha conocido que     estos pueden inducir la conversi&oacute;n de linfocitos     CD4+ Foxp3 negativos a c&eacute;lulas Treg que expresan     este factor de transcripci&oacute;n &#40;17&#41;.    </p>       <p>Algunos han propuesto que el desarrollo de inmunosupresi&oacute;n     mediada por Treg es un mecanismo     de evasi&oacute;n de la respuesta inmunol&oacute;gica que utiliza     el par&aacute;sito a favor de su supervivencia &#40;18,19&#41;;     no obstante, tambi&eacute;n hay evidencia acerca de la     protecci&oacute;n que confieren sobre el da&ntilde;o tisular que     produce la respuesta inflamatoria en contra de la     infecci&oacute;n &#40;20&#41;. Las personas con esquistosomiasis o     filariasis que desarrollan una fuerte inmunosupresi&oacute;n tienen manifestaciones cl&iacute;nicas m&aacute;s leves dado el menor     da&ntilde;o tisular secundario a la inflamaci&oacute;n en contra     del par&aacute;sito &#40;y del tejido propio que lo rodea&#41; &#40;21&#41;.    </p>       <p>Los helmintos inducen Treg que provocan un estado     de hiporrespuesta espec&iacute;fico a ant&iacute;genos derivados     de estas fuentes &#40;13&#41;, pero tambi&eacute;n pueden expandirlas     de manera policlonal y modificar respuestas     a otros ant&iacute;genos a los que haya coexposici&oacute;n. Por     estas propiedades, es de mucho inter&eacute;s en inmunoterapia     el efecto promotor de Treg que tienen los helmintos,     pues en ciertas EIC se han encontrado disminuidos   &#40;22&#41;.</p>       <p> <b>Linfocitos B reguladores</b> </p>       <p>Se puede definir un linfocito B regulador &#40;Breg&#41; como     aquel con capacidad de inhibir la respuesta inflamatoria;     por ejemplo, la proliferaci&oacute;n de linfocitos T autorreactivos     o espec&iacute;ficos de al&eacute;rgeno. El mecanismo     m&aacute;s com&uacute;n es la producci&oacute;n de IL-10, pero tambi&eacute;n     se han encontrado Breg que secretan TGF-&#946; y otros     que expresan Foxp3 &#40;23,24&#41;. En pacientes con enfermedades     autoinmunes o asma se ha observado alteraci&oacute;n     del n&uacute;mero o la funci&oacute;n de los Breg &#40;25,26&#41;.     Como se muestra en la <a href="img/revistas/iat/v29n2/v29n2a07t1" target="_blank">tabla 1</a>, el inmunofenotipo de     las poblaciones de Breg es muy heterog&eacute;neo. </p>       <p>Hay estudios que demuestran que las infecciones helm&iacute;nticas     pueden estimular el desarrollo de Breg. En     ratones, se describi&oacute; que la capacidad supresora de     la respuesta al&eacute;rgica que tiene <i>Schistosoma mansoni</i>    es dependiente de linfocitos B &#40;LB&#41; productores de     IL-10 que se encuentran principalmente en la zona     marginal del bazo. Estos inducen la conversi&oacute;n de un     mayor n&uacute;mero de c&eacute;lulas al fenotipo CD25+Foxp3     que los LB foliculares del mismo &oacute;rgano &#40;28&#41;. Recientemente,     en un modelo de artritis, el desarrollo de     esta enfermedad se asoci&oacute; a un menor n&uacute;mero de LB     productores de IL-10, lo cual se revirti&oacute; al ser tratados     con ES-62, un producto de excreci&oacute;n/secreci&oacute;n de     <i>Acantocheilonema vitae</i> &#40;32&#41;.</p>       <p> Previamente se hab&iacute;a observado que la infecci&oacute;n por     helmintos reduc&iacute;a las manifestaciones cl&iacute;nicas de la     esclerosis m&uacute;ltiple &#40;EM&#41;. Indagando sobre la causa de     este hallazgo, Correale y colaboradores &#40;29&#41; compararon     los niveles de IL-10 producidos por LB en pacientes     y controles sanos; encontraron, en primer lugar,     que la producci&oacute;n de la citocina era menor en los     pacientes con EM que en los controles sanos; sin embargo,     cuando se analiz&oacute; este factor en los pacientes     infectados por helmintos, se detect&oacute; que los LB produc&iacute;an     IL-10 en los niveles normales observados en     los controles. Hay dos estudios en humanos que han     indagado la relaci&oacute;n entre los Breg y la infecci&oacute;n por     <i>Schistosoma haematobium</i>. En gaboneses, se encontr&oacute; un mayor porcentaje de Breg en los infectados que en     los no infectados &#40;28&#41;. En otra publicaci&oacute;n &#40;30&#41;, este     mismo grupo investig&oacute; el papel funcional de estas c&eacute;lulas     en el humano y encontr&oacute; que la depleci&oacute;n de la     fracci&oacute;n de linfocitos B CD1d<sup>hi</sup> resultaba en un menor     desarrollo de linfocitos T IL-10<sup>+</sup>.    </p>       <p><i>C&eacute;lulas linfoides innatas</i> </p>       <p>Las c&eacute;lulas linfoides innatas o ILC &#40;por la sigla en ingl&eacute;s     de <i>innate lymphoid cells</i>&#41; representan varias subpoblaciones     celulares con una posici&oacute;n intermedia     entre la respuesta inmune innata y la adaptativa, en     el sentido que no expresan ning&uacute;n marcador de linaje     propio de linfocitos, pero provienen de un precursor     linfoide com&uacute;n y conservan caracter&iacute;sticas funcionales     similares a los LT, principalmente la expresi&oacute;n de     factores de transcripci&oacute;n y la producci&oacute;n de citocinas t&iacute;picas     de la respuesta celular mediada por LT CD4+ &#40;33&#41;.    </p>       ]]></body>
<body><![CDATA[<p>Las ILC participan en los mecanismos de resistencia     frente al par&aacute;sito y se inducen en respuesta a la producci&oacute;n     de alarminas, como la IL-33 y la linfopoyetina     del estroma del timo &#40;TSLP&#41;, estimuladas tras el     da&ntilde;o epitelial desencadenado por la invasi&oacute;n &#40;34,35&#41;.     No obstante, parece ser que algunos par&aacute;sitos pueden     desarrollar mecanismos para evadir este tipo de respuesta,     tal como se observ&oacute; en un modelo en ratones     en el que la coadministraci&oacute;n de productos de excreci&oacute;n/     secreci&oacute;n de <i>Heligmosomoides polygyrus</i> con     extracto alerg&eacute;nico disminuy&oacute; la producci&oacute;n de IL-33     y de citocinas tipo 2 por las ILC2 que normalmente se     observaba con el al&eacute;rgeno solo &#40;36&#41;.    </p>       <p>Aunque las ILC2 se han asociado a la promoci&oacute;n de     enfermedades al&eacute;rgicas &#40;como el asma&#41; e hiperreactividad     bronquial en ratones y humanos &#40;37&#41;, tambi&eacute;n     se han vinculado positivamente a la homeostasis tisular     en las v&iacute;as respiratorias despu&eacute;s de una infecci&oacute;n     por el virus de la influenza &#40;38&#41;. Recientemente se     demostr&oacute; en humanos que en la filariasis se expanden     las ILC2, pero tambi&eacute;n las ILC3 que estimulan la     respuesta Th17. Este es el primer estudio en el que se     compara en condiciones de infecci&oacute;n natural la regulaci&oacute;n     de las ILC &#40;39&#41;.    </p>       <p><i>C&eacute;lulas no linfoides de la respuesta innata </i></p>       <p>Es bastante amplio el espectro de c&eacute;lulas de la respuesta     innata que est&aacute;n sujetas a inmunomodulaci&oacute;n por     helmintos. Incluso, en algunas infecciones helm&iacute;nticas     estas c&eacute;lulas son necesarias y suficientes para conferir     inmunidad protectora frente al par&aacute;sito &#40;40&#41;, lo     cual es de esperar dado que la vida parasitaria en los     vertebrados antecede a la aparici&oacute;n de muchos de los     componentes de la respuesta adaptativa propios de     los mam&iacute;feros &#40;41&#41;. El perfil de activaci&oacute;n que adquiere     una de estas c&eacute;lulas al ser estimulada por componentes     del par&aacute;sito difiere de las formas cl&aacute;sicas descritas     y que son propias de otros tipos de infecciones,     como las bacterianas. Varias de estas poblaciones     son una fuente temprana y abundante de citocinas     tipo 2 &#40;33&#41;, muy importantes en la respuesta de defensa     frente a los helmintos, pero que pueden modular     la aparici&oacute;n de otros trastornos de la respuesta inmunol&oacute;gica   &#40;42&#41;.    </p>       <p>Las c&eacute;lulas dendr&iacute;ticas &#40;CD&#41; son claves en la modulaci&oacute;n     de la respuesta adaptativa y un blanco importante     de supresi&oacute;n en estas infecciones. Varias investigaciones     han identificado productos derivados de helmintos     que disminuyen las v&iacute;as de transducci&oacute;n de se&ntilde;ales     proinflamatorias inducidas por pat&oacute;genos &#40;43&#41;. Por     ejemplo, las microfilarias de <i>Brugia malayi</i>, cuando     son capturadas por las CD, inhiben la producci&oacute;n de     IL-12 en respuesta a ant&iacute;genos de <i>Staphylococcus aureus</i>  &#40;44&#41;. Varios componentes de<i> Schistosoma mansoni </i>act&uacute;an directamente sobre las CD, tales como     algunos glicanos que son reconocidos a trav&eacute;s de     CD209 y promueven la polarizaci&oacute;n hacia Th2 &#40;45&#41;.     Otro es el l&iacute;pido fosfatidil-serina, reconocido por el     receptor-2 tipo <i>Toll &#40;Toll-like receptor-2&#41;</i> en las DC,     que induce el desarrollo de Treg &#40;46&#41;.    </p>       <p>El macr&oacute;fago es una c&eacute;lula vinculada por excelencia     a la respuesta Th1, sin embargo, puede sufrir un     proceso alternativo de activaci&oacute;n en el que expresa     y secreta productos diferentes a los asociados a la fagocitosis     convencional de bacterias &#40;quitinasas y arginina,     por ejemplo&#41; &#40;47&#41;. Los macr&oacute;fagos activados     alternativamente &#40;M2&#41; participan en la defensa frente     a los par&aacute;sitos, pero tambi&eacute;n se los ha vinculado a     otros procesos fisiol&oacute;gicos, como la homeostasis del     tejido adiposo &#40;42&#41;. En &aacute;reas donde las helmintiasis     son end&eacute;micas se ha encontrado que el perfil M2 es     m&aacute;s frecuente &#40;48&#41;. La activaci&oacute;n de este perfil puede     influir negativamente en la defensa contra otros pat&oacute;genos   &#40;49&#41;. Recientemente tambi&eacute;n se describi&oacute; un     fenotipo de activaci&oacute;n alternativa del neutr&oacute;filo &#40;N2&#41; inducida por un helminto, que es esencial en el desarrollo     de M2 en el pulm&oacute;n en el contexto de un modelo     de infecci&oacute;n por <i>Nippostrongylus brasiliensis</i>. Los N2     secretan citocinas tipo 2, como IL-5, IL-13 e IL-33 &#40;50&#41;.    </p>       <p>La eosinofilia es una caracter&iacute;stica t&iacute;pica de la infecci&oacute;n     por helmintos, pero se ha debatido sobre su importancia     en la defensa contra estos &#40;51&#41;. Estas c&eacute;lulas     pueden ser blanco de inmunosupresi&oacute;n. <i>Trichinella     spiralis</i> puede activar otro tipo de respuesta en el     eosin&oacute;filo que la proteger&iacute;a de su actividad antihelm&iacute;ntica   &#40;52&#41;. <i>Necator americanus</i> produce metaloproteasas     que degradan la eotaxina, un potente quimioatrayente     de eosin&oacute;filos &#40;53&#41;.    </p> 	    <p>&nbsp;</p>       <p><font size="3"><b>LA RESPUESTA DE ANTICUERPOS</b></font></p>       <p> La mayor&iacute;a de los helmintos inducen en el hospedero     la producci&oacute;n de IgE e IgG4 y la regulaci&oacute;n de ambas     respuestas de anticuerpos parece influir en el estado de     resistencia a la infecci&oacute;n. La producci&oacute;n de IgE espec&iacute;fica     para prote&iacute;nas del helminto puede constituir un     mecanismo de protecci&oacute;n, ya que se han encontrado     asociaciones entre altos niveles de IgE espec&iacute;fica hacia     ant&iacute;genos del par&aacute;sito con un menor riesgo de reinfecci&oacute;n   &#40;54,55&#41;. Algunos componentes de helmintos se     comportan como al&eacute;rgenos cl&aacute;sicos &#40;56,57&#41;. No obstante,     otros ant&iacute;genos, que unen IgE inducen respuestas     m&aacute;s bien d&eacute;biles y es m&aacute;s dudosa su capacidad de desencadenar     reacciones parecidas a la al&eacute;rgica &#40;56&#41;. Por     otro lado, la infecci&oacute;n helm&iacute;ntica tambi&eacute;n aumenta     de forma policlonal la producci&oacute;n de estos anticuerpos     y se considera que pueden tener un papel protector     frente a las manifestaciones al&eacute;rgicas al producir     saturaci&oacute;n de los receptores FceRI en las c&eacute;lulas efectoras     y prevenir su activaci&oacute;n. Es probable que, aparte     del componente proteico, otros tipos de biomol&eacute;culas     tengan una influencia directa en la estimulaci&oacute;n de la     IgE de una manera linfocito T-independiente. La quitina     es un componente no-proteico &#40;carbohidrato&#41;,     abundante en par&aacute;sitos y algunas fuentes de al&eacute;rgenos,     que puede influir en la producci&oacute;n de IgE &#40;58,59&#41;.     Los niveles de IgG4 aumentan en condiciones que     promueven procesos de inmunorregulaci&oacute;n intensa.     Esta situaci&oacute;n puede explicarse por el efecto directo     de la IL-10, lo cual hace razonable que se eleve en     las infecciones helm&iacute;nticas &#40;60&#41;. Es probable que la     producci&oacute;n de IgG4 haga parte de los mecanismos de     evasi&oacute;n estimulados por el par&aacute;sito para disminuir la     respuesta inflamatoria y promover su supervivencia.     A diferencia de los otros subtipos de IgG, la IgG4 es     incapaz de activar el complemento as&iacute; como de inducir     otro tipo de respuestas inflamatorias mediadas     por anticuerpos &#40;61,62&#41;. Se dice que tienen acci&oacute;n     bloqueadora sobre otros isotipos que s&iacute; inducen reacciones     inflamatorias. De manera natural se pueden     encontrar IgG4 bivalentes, lo cual impide el entrecruzamiento     de su receptor y la activaci&oacute;n de una respuesta     inflamatoria &#40;63&#41;. En estudios de reinfecci&oacute;n     por<i> Schistosoma spp.</i>, los niveles de IgG4 espec&iacute;fica     se han encontrado m&aacute;s bajos en los individuos resistentes     que en los susceptibles &#40;64&#41;. No obstante, estos     anticuerpos parecen ser importante en prevenir la     inmunopatolog&iacute;a asociada a la destrucci&oacute;n tisular     desencadenada por el par&aacute;sito, pues en algunos tipos     de filariasis, los individuos infectados con t&iacute;tulos m&aacute;s     altos de IgG4 desarrollan un cuadro cl&iacute;nico menos     grave &#40;58,64&#41;.    </p>       ]]></body>
<body><![CDATA[<p>&nbsp;</p>       <p><font size="3"><b>INMUNOMODULACI&Oacute;N PRODUCIDA POR ASCARIS</b></font></p>       <p>La ascariasis es la geohelmintiasis m&aacute;s prevalente en     el mundo. Aunque solo en 8 &#37; a 15 &#37; de los casos     se demuestra morbilidad &#40;65&#41;, el espectro de efectos     sobre la respuesta inmune es m&aacute;s amplio, dada la influencia     de la inmunomodulaci&oacute;n que genera en la     expresi&oacute;n de otros fenotipos y procesos biol&oacute;gicos en     el hospedero &#40;66&#41;. Se entiende menos la inmunomodulaci&oacute;n     ejercida por<i> Ascaris</i> que la de otros nem&aacute;todos,     pues no en todos los casos la inmunosupresi&oacute;n es     el efecto predominante &#40;67&#41;. La alta prevalencia de la     infecci&oacute;n sugiere que este par&aacute;sito tiene mecanismos     exitosos para controlar la respuesta inmune del hospedero     a favor de su supervivencia &#40;6&#41;. Sin embargo,     el reducido porcentaje de la poblaci&oacute;n que desarrolla     infestaciones graves indica que los mecanismos de resistencia     al par&aacute;sito, aunque no sean suficientes para     conferir una inmunidad est&eacute;ril, son m&aacute;s efectivos que     hacia otras infecciones parasitarias asociadas a mayor     morbimortalidad &#40;57&#41;. Se sabe que la respuesta inmune     contra <i>Ascaris </i>se caracteriza por una fuerte polarizaci&oacute;n     hacia el perfil Th2/IgE &#40;68&#41;. Su ciclo pulmonar     se asocia a manifestaciones cl&iacute;nicas parecidas al asma     y en algunas poblaciones la infecci&oacute;n se ha asociado     con mayor riesgo de alergias &#40;67,69&#41; y, viceversa,     la predisposici&oacute;n at&oacute;pica protege del desarrollo de infecciones intensas por par&aacute;sitos &#40;70&#41;, pero no por     otros pat&oacute;genos &#40;71&#41;. De igual manera, en algunos     modelos de exposici&oacute;n al extracto proteico funciona     como un adyuvante Th2. No obstante, la infecci&oacute;n     puede inducir tambi&eacute;n inmunosupresi&oacute;n, especialmente     cuando es cr&oacute;nica &#40;66, 72&#41;. En varias poblaciones     se han detectado asociaciones negativas entre     la intensidad de la ascariasis y la reactividad de     la prueba cut&aacute;nea a al&eacute;rgenos &#40;72&#41;, as&iacute; como con la     presentaci&oacute;n de asma. En ni&ntilde;os cr&oacute;nicamente infectados,     adem&aacute;s de producir una polarizaci&oacute;n Th2,     eleva la producci&oacute;n de IL-10 &#40;73&#41;. Varios modelos     animales de infecci&oacute;n y otros de exposici&oacute;n al fluido     seudocel&oacute;mico &#40;FSC&#41; muestran que este disminuye     la intensidad de la respuesta a otros al&eacute;rgenos &#40;74&#41;     as&iacute; como de la inflamaci&oacute;n tipo Th1 en un modelo     de artritis &#40;75&#41;.    </p>       <p>Se supone que <i>Ascaris</i> tiene varios componentes     inmunomoduladores dada la homolog&iacute;a con prote&iacute;nas     reconocidas como supresores, pero es poco lo     que se ha investigado &#40;76&#41;. La mayor&iacute;a de las mol&eacute;culas     que se le han purificado han tenido la finalidad     de estudiar sus propiedades alerg&eacute;nicas &#40;56,77&#41;.     PAS-1 es el componente purificado de este helminto     m&aacute;s estudiado como inmunomodulador. Se sabe     que inhibe la respuesta inmunol&oacute;gica hacia otros     componentes del mismo par&aacute;sito o de una fuente     distinta &#40;76&#41;. PAS-1 aumenta el n&uacute;mero de Treg y de     linfocitos T CD8+ y&#948;TCR+ en ratones, los cuales son     fuentes de IL-10 y TGF-&#946; &#40;78&#41;.</p>       <p>&nbsp;</p>       <p><font size="3"><b>CONCLUSIONES</b></font></p>         <p>Los helmintos han convivido con los mam&iacute;feros en     una relaci&oacute;n de parasitismo por millones de a&ntilde;os, lo     cual implica que haya diferencias con el resto de los     pat&oacute;genos en la forma de reconocimiento del sistema     inmune. De esta manera, en los hospederos se han     conservado, durante su evoluci&oacute;n, mecanismos de     tolerancia a la infecci&oacute;n que disminuyen la destrucci&oacute;n     del par&aacute;sito, pero que, a la vez, reducen el da&ntilde;o     tisular secundario a la inflamaci&oacute;n. Es de esperar que     la ausencia de infecciones helm&iacute;nticas cambie las     condiciones naturales en las que se presenta la regulaci&oacute;n     del sistema inmunol&oacute;gico y que se relacione     con el aumento en la prevalencia de varias enfermedades     inflamatorias cr&oacute;nicas.    </p>       <p>En los &uacute;ltimos 10 a&ntilde;os se ha descubierto un amplio     n&uacute;mero de poblaciones sujetas a la inmunomodulaci&oacute;n     ejercida por los helmintos, las cuales se encuentran     funcionalmente interrelacionadas. Se destaca el     hallazgo de que los LB pueden tener funciones reguladoras     y que las helmintiasis pueden inducirlos. El     estudio de estas infecciones tambi&eacute;n ha permitido     explorar los or&iacute;genes de la respuesta Th2, un aspecto     realmente poco entendido. Hoy se sabe que las     infecciones helm&iacute;nticas son detectadas de manera     temprana por varios componentes de la respuesta innata   &#40;CD, M2, N2 e ILC2, por ejemplo&#41; que se activan     de una manera diferente a la observada para otros     pat&oacute;genos, liberando citocinas tipo 2 o algunas antinflamatorias.     Aunque la respuesta tipo 2 es central     en el desarrollo de las enfermedades al&eacute;rgicas, en las     helmintiasis generalmente se presenta paralelamente     a mecanismos inmunosupresores. En este sentido, y     generalmente cuando la infecci&oacute;n es cr&oacute;nica, la misma     respuesta Th2 ''modificada'' puede proteger de las     alergias.    </p>       <p>Dado que las formas y consecuencias del parasitismo     var&iacute;an entre las especies, no se puede predecir si los     mecanismos inmunosupresores que se observan en     un modelo de infecci&oacute;n se presentar&aacute;n en otro. Falta     definir si la tendencia a considerar a <i>Ascaris</i> como un     par&aacute;sito que produce menos inmunosupresi&oacute;n que     otros es consecuencia del enfoque con el que se ha     estudiado o si tiene un fundamento biol&oacute;gico.    </p>       <p>&nbsp;</p>       ]]></body>
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