<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0864-0289</journal-id>
<journal-title><![CDATA[Revista Cubana de Hematología, Inmunología y Hemoterapia]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Hematol Inmunol Hemoter]]></abbrev-journal-title>
<issn>0864-0289</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0864-02892016000400005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Helmintosis y autoinmunidad]]></article-title>
<article-title xml:lang="en"><![CDATA[Helminth infections and autoimmunity]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonte Galindo]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García Menéndez]]></surname>
<given-names><![CDATA[Gissel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Baldriche Acosta]]></surname>
<given-names><![CDATA[Jessica]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fong González]]></surname>
<given-names><![CDATA[Annia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez Sutil]]></surname>
<given-names><![CDATA[Yuliet]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto de Medicina Tropical Pedro Kourí  ]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>32</volume>
<numero>4</numero>
<fpage>455</fpage>
<lpage>469</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0864-02892016000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0864-02892016000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0864-02892016000400005&amp;lng=en&amp;nrm=iso"></self-uri><kwd-group>
<kwd lng="es"><![CDATA[helmintosis]]></kwd>
<kwd lng="es"><![CDATA[helmintos]]></kwd>
<kwd lng="es"><![CDATA[inmunorregulación]]></kwd>
<kwd lng="es"><![CDATA[autoinmunidad]]></kwd>
<kwd lng="es"><![CDATA[inflamación]]></kwd>
<kwd lng="en"><![CDATA[helminthes infections]]></kwd>
<kwd lng="en"><![CDATA[helminths]]></kwd>
<kwd lng="en"><![CDATA[immunoregulation]]></kwd>
<kwd lng="en"><![CDATA[autoimmunity]]></kwd>
<kwd lng="en"><![CDATA[inflammation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <div>        <p align="right"> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>ART&#205;CULO      DE REVISI&#211;N</b> </font></p>       <p align="center">&nbsp; </p>       <p align="center">&nbsp; </p>       <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="4">Helmintosis      y autoinmunidad</font></b> </font></p>       <p>&nbsp;</p>       <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> <b><font size="3">Helminth      infections and autoimmunity </font></b></font></p>       <p align="center">&nbsp; </p>       <p align="center">&nbsp; </p>       <p align="center">&nbsp; </p>       ]]></body>
<body><![CDATA[<p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b> Luis Fonte      Galindo</b><b>, Gissel Garc&#237;a Men&#233;ndez, Jessica Baldriche Acosta</b><b>,      Annia Fong Gonz&#225;lez, Yuliet M&#233;ndez Sutil</b> </font></p>       <p align="left"><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Instituto      de Medicina Tropical "Pedro Kour&#237;". La Habana, Cuba. </font></p>   </div>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><br clear="all"/>   </b> </font> </p>     <p>&nbsp; </p> <hr>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>RESUMEN</b>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Las evidencias    epidemiol&#243;gicas, cl&#237;nicas e inmunol&#243;gicas de estudios en humanos    y los datos obtenidos de experimentos en modelos animales ofrecen un soporte    creciente al criterio de que las infecciones por helmintos tienen un efecto    protector contra entidades patol&#243;gicas que transcurren con desregulaci&#243;n    del sistema inmunitario, tales como enfermedades autoinmunes y algunas alteraciones    inflamatorias idiop&#225;ticas. A partir de este precedente, el objetivo de    este trabajo fue revisar y analizar lo publicado sobre helmintosis, regulaci&#243;n    de las respuestas inmunitarias y eventos autoinmunes e inflamatorios. Los an&#225;lisis    realizados permiten concluir que la regulaci&#243;n de las respuestas inmunitarias    del hospedero por los helmintos repercute en la frecuencia e intensidad de eventos    autoinmunes e inflamatorios. En aras de una pr&#225;ctica m&#233;dica de mejor    calidad, las consecuencias cl&#237;nicas y terap&#233;uticas de esas repercusiones    deben ser conocidas por los profesionales relacionados con el diagn&#243;stico    y tratamiento de enfermedades autoinmunes y alteraciones inflamatorias idiop&#225;ticas.    </font></p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Palabras clave:    </b> helmintosis; helmintos; inmunorregulaci&#243;n; autoinmunidad; inflamaci&#243;n.    </font></p> <hr>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>ABSTRACT</b>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Epidemiological,    clinical and immunological evidence from human studies and data obtained from    experiments in animal models offer increased support to the view that helminth    infections have a protective effect against pathological entities that run with    deregulation of the immune system, such as illness idiopathic autoimmune and    inflammatory changes some. From this precedent, the objective of this study    was to review and analyze the literature on helminth infections, regulation    of immune responses and autoimmune and inflammatory events. Studies support    the conclusion that regulation of immune responses by helminth hosts affects    frequency and intensity of autoimmune and inflammatory events. In order to better    quality medical practice, clinical and therapeutic implications of these impacts    should be known by professionals in diagnosis and treatment of idiopathic autoimmune    diseases and inflammatory disorders. </font></p>     ]]></body>
<body><![CDATA[<p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Keywords</b>    : helminthes infections; helminths; immunoregulation; autoimmunity; inflammation.    </font></p> <hr>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> </font></p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b> <br clear="all"/> </b> </font>      <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">INTRODUCCI&#211;N</font></b>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Durante las &#250;ltimas    cinco d&#233;cadas, se ha producido un incremento en la incidencia de enfermedades    autoinmunes y alteraciones inflamatorias idiop&#225;ticas en los pa&#237;ses    econ&#243;micamente desarrollados (fundamentalmente, en Estados Unidos y Europa)    y, m&#225;s recientemente, en las &#225;reas urbanizadas de las naciones en    desarrollo<sup>1-2</sup>. Ese incremento ha sido tan acelerado que no podr&#237;a    ser explicado por factores gen&#233;ticos (sin que ello niegue la existencia    de predisposici&#243;n gen&#233;tica a la mayor&#237;a de esas entidades). En    consecuencia, se considera que factores ambientales ser&#237;an protag&#243;nicos    en la emergencia de esas enfermedades<sup>1-7</sup>. Datos epidemiol&#243;gicos    parecen proporcionar suficiente soporte al postulado de que las infecciones    por helmintos podr&#237;an proveer alguna protecci&#243;n contra eventos autoinmunes    e inflamatorios <sup>2</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Un corolario de    ese enunciado ser&#237;a que las estrategias de higienizaci&#243;n, saneamiento    ambiental y desparasitaci&#243;n en las &#225;reas urbanizadas hacen a las personas    que en ellas viven m&#225;s vulnerables al desarrollo de enfermedades autoinmunes    y alteraciones inflamatorias idiop&#225;ticas<sup>2,8</sup>. Aunque la mayor&#237;a    de los datos epidemiol&#243;gicos y un c&#250;mulo creciente de resultados experimentales    apoyan el mencionado postulado, la comprensi&#243;n precisa de la relaci&#243;n    entre infecciones por helmintos y fen&#243;menos autoinmunes es hoy tema de    intensos estudios y punto de partida para prometedoras aproximaciones terap&#233;uticas<sup>2,5</sup>.    </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">LAS    INFECCIONES POR HELMINTOS PROTEGEN CONTRA ENFERMEDADES AUTOINMUNES</font></b>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Las evidencias    en favor de que las infecciones por helmintos protegen contra enfermedades autoinmunes    y alteraciones inflamatorias idiop&#225;ticas pueden ser consideradas de tres    tipos: evidencias epidemiol&#243;gicas basadas en metan&#225;lisis, evidencias    epidemiol&#243;gicas basadas en hallazgos serol&#243;gicos y evidencias experimentales.    </font></p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Evidencias    epidemiol&#243;gicas basadas en metan&#225;lisis </b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los metan&#225;lisis    de observaciones, registros y publicaciones realizadas en diferentes &#225;reas    geogr&#225;ficas, principalmente en Estados Unidos y Europa, favorecen la creencia    de que las infecciones por helmintos protegen contra enfermedades autoinmunes    y alteraciones inflamatorias idiop&#225;ticas. As&#237;: </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - En Estados Unidos    y Europa, la enfermedad de Crohn emergi&#243; primero en las poblaciones m&#225;s    opulentas que viv&#237;an en condiciones higi&#233;nicas favorables y en latitudes    m&#225;s al norte, donde las temperaturas m&#225;s fr&#237;as hac&#237;an menos    propicios los escenarios para la transmisi&#243;n de las infecciones por helmintos<sup>9</sup>.    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - En Estados Unidos,    el &#250;ltimo grupo racial donde la enfermedad de Crohn se hizo presente fue    en los individuos de origen africano, quienes, en promedio, son m&#225;s pobres    que las personas de origen europeo<sup>9</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - En estudios    realizados en varios pa&#237;ses, se ha observado una relaci&#243;n negativa    entre incidencia de esclerosis m&#250;ltiple y prevalencia de infecci&#243;n    por helmintos<sup>10</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Las enfermedades    autoinmunes son m&#225;s frecuentes entre los individuos que viven en Europa    Occidental en relaci&#243;n a los que habitan en Europa del Este<sup>9</sup>.    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - En los remanentes    de poblaciones americanas nativas, en los que las infecciones por helmintos    son de alta prevalencia, la frecuencia de enfermedades intestinales inflamatorias    es baja<sup>9</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Los latinos    que llegaron a Estados Unidos despu&#233;s de la adolescencia no desarrollan    des&#243;rdenes inflamatorios intestinales. Sin embargo, sus hijos nacidos en    ese pa&#237;s, donde las condiciones sanitarias son mejores y las posibilidades    de infectar por helmintos son m&#237;nimas, tienen mayor riesgo de padecer de    enfermedades autoinmunes y des&#243;rdenes inflamatorios<sup>9</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - La distribuci&#243;n    mundial de las enfermedades intestinales inflamatorias es pr&#225;cticamente    la imagen especular de las &#225;reas end&#233;micas de infecciones por helmintos<sup>2</sup>.    </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Evidencias    epidemiol&#243;gicas basadas en hallazgos serol&#243;gicos </b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> A&#250;n son escasas    las pesquisas que tratan de evidenciar con herramientas serol&#243;gicas alguna    relaci&#243;n entre infecciones por helmintos y fen&#243;menos autoinmunes.    Entre ellas, dos merecen ser especialmente mencionadas: </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Un estudio reciente    que hall&#243; que individuos infectados con esquistosomas ten&#237;an menores    t&#237;tulos de autoanticuerpos que la poblaci&#243;n libre del par&#225;sito    y que los t&#237;tulos de esos anticuerpos se incrementaron cuando las personas    infectadas fueron tratadas con <i>praziquantel,</i> el medicamento antiparasitario    m&#225;s frecuentemente utilizado en esos casos<sup>11</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Un trabajo realizado    en Argentina en pacientes con esclerosis m&#250;ltiple en remisi&#243;n que    demostr&#243; que cuando estos eran infectados por par&#225;sitos gastrointestinales    (<i>Ascaris lumbricoides, Trichuris trichiura, Strongyloides stercoralis, Hymenolepis    nana y Enterobius vermicularis</i>) permanec&#237;an controlados durante m&#225;s    tiempo y cuando ocurr&#237;an recrudecimientos de la enfermedad estos eran m&#225;s    leves. Significativamente, los pacientes con supresi&#243;n de la enfermedad    asociada con la infecci&#243;n por helmintos mostraban niveles m&#225;s elevados    de las citoquinas reguladoras IL-10 y TGF-&#946; que los individuos no infectados<sup>12-13</sup>.    </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Evidencias    experimentales</b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Las enfermedades    autoinmunes son considerablemente menos prevalentes que las al&#233;rgicas y,    consecuencia de ello, son relativamente escasas las investigaciones epidemiol&#243;gicas    que han podido realizarse para conocer el efecto de las infecciones por helmintos    sobre esos des&#243;rdenes <sup>5</sup>. Para llenar ese vac&#237;o, numerosos    trabajos experimentales han sido realizados. A continuaci&#243;n se mencionan    algunos de los resultados m&#225;s trascendentes: </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - En fecha tan    temprana como 1975, Pearson y Taylor reportaron que en ratas en las que se hab&#237;an    inducido cambios artr&#237;ticos mediante la administraci&#243;n de adyuvante    completo de Freund, la infecci&#243;n por el nematodo <i>Symphacia obvelata</i>atenuaba    esas manifestaciones<sup>14</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - En la artritis    inducida por col&#225;geno tipo II, la infecci&#243;n por <i>Schistosoma mansoni</i>reduce    la producci&#243;n de anticuerpos contra col&#225;geno y de citoquinas inflamatorias,    a la vez que los da&#241;os histopatol&#243;gicos correlacionan negativamente    con la carga parasitaria <sup>15</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - La infecci&#243;n    por <i>S.mansoni</i> inhibe el desarrollo de diabetes tipo I en ratones NOD    (del ingl&#233;s <i>non obese diabetic</i>), ratones que desarrollan diabetes    espont&#225;neamente despu&#233;s de los 6 meses de edad<sup>16</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - El desarrollo    de lesiones en el modelo murino de esclerosis m&#250;ltiple puede ser inhibido    por la infecci&#243;n por varios par&#225;sitos, como fue primeramente demostrado    con <i>S.mansoni</i><sup>17-18</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Las enfermedades    inflamatorias intestinales, entre ellas la colitis ulcerativa y la enfermedad    de Crohn, son des&#243;rdenes frecuentes, y en ocasiones graves, del humano<sup>19</sup>.    Varios modelos de estas enfermedades, generalmente diferenciados por su agente    inductor, han sido desarrollados en ratones. El desarrollo de colitis inducida    por &#225;cido dinitrobenzeno sulf&#243;nico puede ser atenuado por productos    de <i>Hymenolepis diminuta</i>. En otro estudio fue demostrado que los efectos    supresores de <i>H. diminuta</i> eran dependientes de la acci&#243;n de macr&#243;fagos    alternativamente activados y que incluso la administraci&#243;n de estos macr&#243;fagos    en ratones v&#237;rgenes imped&#237;a la inducci&#243;n de la colitis<sup>20</sup>.    En correspondencia con este hallazgo, es muy interesante la observaci&#243;n    de que la remisi&#243;n de la enfermedad de Crohn en los humanos est&#225; asociada    con la acumulaci&#243;n de macr&#243;fagos alternativamente activados en la    pared intestinal<sup>5,21</sup>. </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">MECANISMOS    DE PROTECCI&#211;N CONTRA ENFERMEDADES AUTOINMUNES E INFLAMATORIAS</font></b>    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los resultados    hoy disponibles permiten concluir que esa protecci&#243;n contra enfermedades    autoinmunes e inflamatorias es consecuencia de dos fen&#243;menos inducidos    por estos par&#225;sitos: la regulaci&#243;n de las respuestas inmunitarias    del hospederoy cambios en la flora bacteriana de este <sup>2-3,5,7,9,22-28</sup>.    </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Regulaci&#243;n    de las respuestas inmunitarias del hospedero</b> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Los helmintos    interfieren en las respuestas inmunitarias de sus respectivos hospederos debido    a una compleja madeja de mecanismos regulatorios <sup>29-34</sup>. Estos, por    las secuencias en que tienen lugar, pueden agruparse en tres grandes ejes (sin    que ello excluya la posibilidad de interacciones entre componentes de las tres    vertientes) (<a href="/img/revistas/hih/v32n4/f01_473.gif">Fig</a>.). A continuaci&#243;n se describen    los eventos m&#225;s trascendentales que tienen lugar en los mencionados ejes    regulatorios. </font></p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><i>Producci&#243;n    de citoquinas del tipo alarminas (IL-25, IL-33 y TSLP) por c&#233;lulas epiteliales    intestinales en presencia del par&#225;sito</i> . </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Las c&#233;lulas    epiteliales intestinales (y posiblemente otras c&#233;lulas en otros &#243;rganos    y tejidos) producen IL-25, IL-33 y TSLP (del ingl&#233;s <i>thimic stromal limphopoietin</i>)    en respuesta a la presencia del par&#225;sito en el lumen intestinal<sup>26,35</sup>.    Las IL-25 e IL-33, como se ver&#225; m&#225;s adelante, est&#225;n involucradas    en el est&#237;mulo a la producci&#243;n primaria de mediadores tipo 2. En cambio,    TSLP parece estar m&#225;s relacionado con la limitaci&#243;n de la producci&#243;n    de IL-12 por c&#233;lulas dendr&#237;ticas<sup>36-37</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Las c&#233;lulas    CD4+ Th2, protag&#243;nicas en las respuestas adaptativas a la infecci&#243;n    por helmintos, son las mayores fuentes de citoquinas tipo 2<sup>38</sup>. Sin    embargo, estudios de la &#250;ltima d&#233;cada han identificado una nueva l&#237;nea    de c&#233;lulas innatas en los ganglios linf&#225;ticos mesent&#233;ricos que    producen grandes cantidades de IL-4, IL-5 e IL-13<sup>39-42</sup>. Estas c&#233;lulas,    frecuentemente denominadas c&#233;lulas auxiliadoras tipo 2 innatas<sup>42</sup>,    son respondedoras a las alarminas IL-25 e IL-33 secretadas por las c&#233;lulas    epiteliales intestinales en presencia del par&#225;sito<sup>41-42</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Las interleuquinas    4 y 13 (IL-4 e IL-13) producidas por las c&#233;lulas auxiliadoras tipo 2 innatas    y por las c&#233;lulas CD4+ Th2 modulan las funciones de los macr&#243;fagos    circundantes de dos maneras: primero, deprimen las actividades proinflamatorias    y microbicidas de los macr&#243;fagos de activaci&#243;n cl&#225;sica (M1)<sup>7,43</sup>;    segundo, promueven la secreci&#243;n de las citoquinas antinflamatorias e inmunorreguladoras    IL-10 y TGF-&#946; por los macr&#243;fagos de activaci&#243;n alternativa (M2)<sup>7,44</sup>.    IL-10 y TGF-&#946; regulan respuestas inflamatorias e inmunitarias tanto de    tipo 1 como de tipo 2<sup>3</sup>. </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><i>Productos de    excreci&#243;n-secreci&#243;n de helmintos estimulan cambios en la actividad    de las c&#233;lulas dendr&#237;ticas.</i> </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La presencia de    productos de excreci&#243;n-secreci&#243;n de helmintos modifica la actividad    presentadora de ant&#237;genos de las c&#233;lulas dendr&#237;ticas de dos maneras<sup>7,25-26</sup>:    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Menor expresi&#243;n    en su superficie de mol&#233;culas coestimuladoras (CD40, CD80 y CD 86) y disminuci&#243;n    de la s&#237;ntesis de mediadores proinflamatorios, como IL-12 y TNF (del ingl&#233;s    <i>tumor necrosis factor</i>). Ambos hechos traen como consecuencia una supresi&#243;n    de la diferenciaci&#243;n de c&#233;lulas Th0 a c&#233;lulas Th1 o c&#233;lulas    Th17<sup>5,7,45-49</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Incremento de    la producci&#243;n de las mol&#233;culas antinflamatorias e inmunorreguladoras    IL-10 y TGF-&#946;. Esto, favorece indirectamente la diferenciaci&#243;n de    c&#233;lulas Th0 a c&#233;lulas Th2<sup>5,7,49-50</sup>. </font></p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><i> Exposici&#243;n    de c&#233;lulas dendr&#237;ticas precursoras a helmintosque puede diferenciarlas    a c&#233;lulas dendr&#237;ticas reguladoras, por factores no conocidos<sup>5</sup>    </i> <sup>,7,51-52</sup> . </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> A diferencia de    las c&#233;lulas dendr&#237;ticas cl&#225;sicas, estas son ineficientes en la    presentaci&#243;n antig&#233;nica a c&#233;lulas T. En lugar de ello, estas    c&#233;lulas promueven la diferenciaci&#243;n de c&#233;lulas Th0 nativas a    c&#233;lulas Treg o, alternativamente, estimulan la expansi&#243;n de subpoblaciones    de c&#233;lulas Treg prexistentes. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Tomados de conjunto,    los eventos descritos act&#250;an en sinergia y el resultado es la modulaci&#243;n    de las respuestas inmunitarias del hospedero, lo que compromete las respuestas    Th1 y favorece la actividad de las c&#233;lulas Treg<sup>7</sup>. </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b>Cambios en    la flora bacteriana del hospedero</b> </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> La poblaci&#243;n    de microorganismos normalmente presente en el intestino de los mam&#237;feros    es considerada su microbiota<sup>27</sup>. Observaciones diversas evidencian    de manera creciente que esos microorganismos son importantes en la regulaci&#243;n    de la homeostasis de sus hospederos y, consecuentemente, en el desarrollo de    numerosas enfermedades<sup>53</sup>. Diferentes funciones fisiol&#243;gicas,    entre ellas las respuestas inmunitarias, el metabolismo y el desarrollo cognoscitivo,    est&#225;n afectadas por la composici&#243;n de la microbiota<sup>54</sup>.    Varios art&#237;culos de revisi&#243;n sobre la relaci&#243;n entre microbiota    y enfermedades humanas han sido publicados recientemente<sup>55-56</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Cambios en la    flora bacteriana intestinal se han relacionado con las alteraciones inmunitarias    presentes en enfermedades inflamatorias, tanto de localizaci&#243;n intestinal    como a nivel sist&#233;mico<sup>56-59</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Un desbalance    en las poblaciones bacterianas comensales, conocido como disbiosis, es una caracter&#237;stica    com&#250;n de los pacientes de enfermedades inflamatorias intestinales (colitis    ulcerativa y enfermedad de Crohn)<sup>60</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Si bien la microbiota    est&#225; restringida al tracto intestinal, los metabolitos producidos por las    comunidades de bacterias pueden influir sobre &#243;rganos y tejidos lejanos.    Un estudio demostr&#243; que la alimentaci&#243;n de ratones con una dieta rica    en fibras conduce a un incremento en la circulaci&#243;n de &#225;cidos grasos    de cadena corta (AGCC), como resultado del procesamiento de las fibras por la    microbiota intestinal<sup>61</sup>. Este incremento de los AGCCs regula la inflamaci&#243;n    intestinal y promueve la diferenciaci&#243;n de c&#233;lulas Treg Foxp3+<sup>62-63</sup>.    Estos hallazgos podr&#237;an proveer una explicaci&#243;n a la contribuci&#243;n    de algunos h&#225;bitos alimentarios de la vida moderna (por ejemplo, dietas    ricas en grasas y pobres en fibras) al incremento de la susceptibilidad a enfermedades    inflamatorias<sup>27</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Aunque los helmintos    pueden modular directamente el sistema inmunitario de sus respectivos hospederos,    tal como se ha descrito anteriormente, tambi&#233;n estos par&#225;sitos pueden    influir sobre las respuestas inmunitarias mediante sus efectos sobre la flora    bacteriana intestinal<sup>22,64</sup>. Los resultados de trabajos recientes    sugieren que la infecci&#243;n cr&#243;nica por helmintos afecta la composici&#243;n    de la microbiota: </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - La infecci&#243;n    cr&#243;nica por <i>Heligmosomoides polygyrus</i> favorece la presencia de determinados    tipos de bacterias comensales, de manera particular miembros de la familia Lactobacillaceae<sup>65</sup>.    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - La composici&#243;n    microbiana fecal de individuos que viven en pa&#237;ses europeos industrializados    es diferente de la de aquellos que habitan en &#225;reas rurales africanas.    Por ejemplo, el g&#233;nero <i>Prevotella</i> es m&#225;s com&#250;n en las    personas que viven en pa&#237;ses desarrollados <sup>66</sup>. Esa diversidad    bacteriana pudiera ser consecuencia de diferencias diet&#233;ticas, pero tambi&#233;n    de diferencias en la prevalencia de infecciones por helmintos<sup>64</sup>.    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Estudios muy    recientes sugieren que los helmintos incrementan la producci&#243;n de IL-22    por la mucosa intestinal, tanto en humanos como en ratones <sup>64,67</sup>.    La IL-22, adem&#225;s de estimular la producci&#243;n de mucus y facilitar la    reparaci&#243;n tisular, promueve la producci&#243;n de p&#233;ptidos antimicrobianos,    incluidas prote&#237;nas de la familia de las &#946;-defensinas<sup>68-73</sup>.    A juicio de algunos autores, la IL-22 inducida por la infecci&#243;n por helmintos    pudiera contribuir al control de la inflamaci&#243;n durante las enfermedades    inflamatorias intestinales mediante la contenci&#243;n de la multiplicaci&#243;n    de algunos tipos de bacterias<sup>22</sup>. </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">UTILIZACI&#211;N    DE HELMINTOS EN EL TRATAMIENTO DE ENFERMEDADES HUMANAS </font></b> </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Evidencias epidemiol&#243;gicas,    cl&#237;nicas e inmunol&#243;gicas devenidas de estudios en humanos y datos    obtenidos mediante experimentos en modelos animales ofrecen suficiente soporte    al criterio de que las infecciones por helmintos tienen un efecto benefactor    sobre entidades patol&#243;gicas que transcurren con desregulaci&#243;n del    sistema inmunitario, tales como alergias, enfermedades autoinmunes y alteraciones    inflamatorias intestinales. Ese criterio condujo al desarrollo de numerosos    ensayos de administraci&#243;n de helmintos vivos como herramienta terap&#233;utica<sup>2,5,9,24,30-31,34</sup>    . </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> El primero de    ellos data de 2003, cuando Summers y cols. reportaron el empleo exitoso de huevos    de <i>Trichuris suis </i>en el tratamiento de enfermedades inflamatorias intestinales<sup>74</sup>.    Desde entonces, adem&#225;s de los huevos de <i>T. suis</i>, tambi&#233;n se    han utilizado con fines terap&#233;uticos el desarrollo de infecciones por <i>Necator    americanus</i>. A continuaci&#243;n se describen los resultados de algunos de    los trabajos en los que se ha empleado esta aproximaci&#243;n terap&#233;utica    en el control de enfermedades autoinmunes e inflamatorias: </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - <i>El T. suis</i>    es un par&#225;sito de cerdos que, aunque muy relacionado con <i>T. trichiura</i>,    no puede mantener la infecci&#243;n cr&#243;nica en los humanos y es eliminado    en pocas semanas. Por ese motivo, el tratamiento con sus huevos consiste en    la administraci&#243;n repetida de estos cada dos o tres semanas. En el estudio    antes mencionado, el tratamiento result&#243; en una tendencia a la mejor&#237;a    cl&#237;nica tanto de los pacientes de enfermedad de Crohn como los de colitis    ulcerativa<sup>74</sup>. Trabajos posteriores con pacientes de estas enfermedades    que emplearon la misma herramienta terap&#233;utica, pero realizados a mayor    escala y con la utilizaci&#243;n de grupos controles, confirmaron los primeros    resultados <sup>24,75-76</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - En pacientes    de esclerosis m&#250;ltiple, la administraci&#243;n de huevos de <i>T. suis</i>    result&#243; en una tendencia hacia la reducci&#243;n del n&#250;mero de lesiones    nuevas, demostrada por im&#225;genes de resonancia magn&#233;tica<sup>77</sup>.    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> - Dado que <i>T.    suis</i> es un par&#225;sito no adaptado a humanos, su administraci&#243;n est&#225;    asociada al desarrollo de reacciones colaterales, fundamentalmente digestivas<sup>78</sup>.    Esta adversidad ha conducido a algunos grupos de trabajo al empleo de par&#225;sitos    de humanos con fines terap&#233;uticos (por ejemplo, <i>N. americanus</i>).    En pacientes de esclerosis m&#250;ltiple, la infecci&#243;n por <i>N. americanus    </i>result&#243; en una tendencia a la reducci&#243;n de las manifestaciones    cl&#237;nicas asociadas a esta enfermedad<sup>79</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Sin embargo, los    resultados de los estudios en los que se administraron helmintos vivos como    herramienta terap&#233;utica no siempre han sido favorables <sup>5,22,24,34</sup>.    Algunos, como los mencionados, demostraron la acci&#243;n supresora de los par&#225;sitos    suministrados <sup>24,74-77,79</sup>. Otros, en cambio no encontraron el efecto    protector esperado<sup>22,24,27,80-82</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Para entender    esos resultados, aparentemente dis&#237;miles, deben tenerse en cuenta varias    limitaciones presentes en parte de los ensayos hasta ahora realizados. As&#237;:    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 1- Las personas    que viven en &#225;reas end&#233;micas de helmintos est&#225;n expuestas a infecciones    parasitarias desde edades muy tempranas, generalmente antes de que tenga lugar    el desarrollo de enfermedades con compromiso de la regulaci&#243;n del sistema    inmunitario. Por ese motivo, la administraci&#243;n de helmintos con fines terap&#233;uticos    debe realizarse a edades tan tempranas como aquellas a las que ocurre la infecci&#243;n    natural por esos par&#225;sitos. Sin embargo, debido a consideraciones &#233;ticas    y pr&#225;cticas muy comprensibles, la mayor&#237;a de los ensayos han sido    llevados a cabo cuando los individuos participantes ya padecen las enfermedades    que cursan con desregulaci&#243;n del sistema inmunitario y en consecuencia,    cuando es m&#225;s dif&#237;cil suprimir desequilibrios ya establecidos<sup>5,22,83</sup>.    </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 2- Tambi&#233;n    por consideraciones &#233;ticas, muchos de los ensayos realizados han utilizado    dosis parasitarias muy inferiores a las que ocurren durante la infecci&#243;n    natural y podr&#237;an no haber sido eficaces en suprimir la desregulaci&#243;n    inmunitaria de la enfermedad tratada<sup>84</sup>. </font></p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Adem&#225;s de    estas limitaciones, otro importante obst&#225;culo se erige frente a la utilizaci&#243;n    de helmintos vivos con fines terap&#233;uticos: la no adherencia de parte de    los pacientes al tratamiento porque este los har&#237;a portadores de par&#225;sitos    vivos<sup>2</sup>. </font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Teniendo en cuenta    estas dificultades, y las devenidas del empleo de helmintos vivos en el tratamiento    de enfermedades al&#233;rgicas, los objetivos inmediatos son el logro de un    conocimiento m&#225;s preciso de los mecanismos por los cuales estos par&#225;sitos    ejercen sus efectos protectores y, paralelamente, la identificaci&#243;n delas    mol&#233;culas helm&#237;nticas capaces de replicar esas acciones; informes    recientes dan cuenta de avances en este sentido<sup>85-86</sup>. Ello propiciar&#237;a    el logro del objetivo final de este acercamiento al tratamiento de enfermedades    al&#233;rgicas, autoinmunes e inflamatorias, el desarrollo de uno o m&#225;s    medicamentos que conserven la capacidad protectora de los par&#225;sitos vivos,    entra&#241;en m&#237;nimos riesgos para los pacientes, sean mayoritariamente    aceptados por estos y puedan ser producidos con adecuados controles de calidad.    </font></p>     <p>&nbsp; </p>     <p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><b><font size="3">REFERENCIAS    BIBLIOGR&#193;FICAS </font></b> </font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 1. Smits HH, YazdanbakhshM.    Chronic helminth infections modulate allergen-specific immune responses: protection    against development of allergic disorders? Ann Med. 2007;39:428-39.     </font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 2. McKay DM. 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<body><![CDATA[<!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 80. Blount D,    Hooi D, Feary J, Venn A, Telford G, Brown A, et al. Immunologic profiles of    persons recruited for a randomized, placebo-controlled clinical trial of hookworm    infection. Am J Trop Med Hyg. 2009 Nov;81(5):911-6.doi: 10.4269/ajtmh.2009.09-0237.        </font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 81. Feary J, Venn    A, Brown A, Hooi D, Falcone FH, Mortimer K, et al. Safety of hookworm infection    in individuals with measurable airway responsiveness: a randomized placebo-controlled    feasibility study. ClinExp Allergy. 2009 Jul;39(7):1060-8.doi: 10.1111/j.1365-2222.2009.03187.x.        </font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 82. Bager P,Arnved    J, R&#248;nborg S, Wohlfahrt J, Poulsen LK, Westergaard T, et al. Trichuris    suis ova therapy for allergic rhinitis: a randomized, double-blind, placebo-controlled    clinical trial. J Allergy Clin Immunol. 2010 Jan;125(1):123-30.e1-3. doi: 10.1016/j.jaci.2009.08.006.        </font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 83. Hepworth MR,    Hamelmann E, Lucius R, Hartmann S. Looking into the future of <i>Trichuris </i>suis    therapy. J Allergy Clin Immunol. 2010;125:767-8.     </font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 84. Mortimer K,    Brown A, Feary J, Jagger C, Lewis S, Antoniak M, et al. Dose-ranging study for    trials of therapeutic infection with Necator americanus in humans. Am J Trop    Med Hyg. 2006;75:914-20.     </font></p>     ]]></body>
<body><![CDATA[<!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 85. Robinson MW,    Donnelly S, Hutchinson AT. A family of helminth molecules that modulate innate    cell responses via molecular mimicry of host antimicrobial peptides. PLoSPathog.    2011;7:e1002042.     </font></p>     <!-- ref --><p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> 86. Robinson MW,    Donnelly S, Dalton JP. Helminthdefence molecules-immunomodulators designed by    parasites!. Front Microbiol.2013;4:296.     </font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana, Arial, Helvetica, sans-serif" size="2"> Recibido: marzo    4, 2016.    <br>   </font><font face="Verdana, Arial, Helvetica, sans-serif" size="2">Aceptado:    junio 24, 2016. </font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p> <font face="Verdana, Arial, Helvetica, sans-serif" size="2"><i>Dr. Luis Fonte    Galindo</i> . Instituto de Medicina Tropical "Pedro Kour&#237;" . Autopista    Novia del Mediod&#237;a km. 6<sup>1</sup>/<sub>2</sub>, La Lisa, Apartado postal    601, Marianao 13. La Habana, Cuba. Email: <a href="mailto:luisfonte@infomed.sld.cu">luisfonte@infomed.sld.cu</a>    </font></p>        ]]></body><back>
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