<?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>0535-5133</journal-id>
<journal-title><![CDATA[Investigación Clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. clín]]></abbrev-journal-title>
<issn>0535-5133</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Investigaciones Clínicas "Dr. Américo Negrette", Facultad de Medicina, Universidad del Zulia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0535-51332009000400011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Respuesta inmunitaria de la enfermedad de Hansen: Revisión]]></article-title>
<article-title xml:lang="en"><![CDATA[Immune response of Hansen´s disease: Review]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rada]]></surname>
<given-names><![CDATA[Elsa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aranzazu]]></surname>
<given-names><![CDATA[Nacarid]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Convit]]></surname>
<given-names><![CDATA[Jacinto]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Central de Venezuela Instituto de Biomedicina Laboratorio de Bioquímica]]></institution>
<addr-line><![CDATA[Caracas ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2009</year>
</pub-date>
<volume>50</volume>
<numero>4</numero>
<fpage>513</fpage>
<lpage>527</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0535-51332009000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0535-51332009000400011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0535-51332009000400011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La enfermedad de Hansen presenta un amplio espectro de manifestaciones clínicas e histopatológicas, las cuales son un reflejo de la naturaleza de la respuesta inmunológica del individuo ante diversos componentes del Mycobacterium leprae. El sistema inmunológico, integrado por la existencia de una inmunidad innata y adaptativa, ofrece protección frente a infecciones de diversas etiologías, entre ellas las bacterianas. Por supuesto las bacterias han logrado desarrollar múltiples estrategias para evadir las defensas del hospedador, que se basan en mecanismos algunos muy complejos y otros más simples, pero con una sola finalidad de “resistir” el ataque del hospedador y lograr sobrevivir. Estudios realizados en la enfermedad de Hansen han podido determinar los diferentes componentes que puedan estar actuando tanto en la inmunidad innata cómo en la adquirida. En este trabajo se trata de resumir algunos estudios recientes en la enfermedad de Hansen con mayor énfasis en el área de inmunología, sin dejar de considerar que toda enfermedad debe estar muy ligada a otros aspectos tan igual de importantes cómo son los sociales, ambientales y otros de muy difícil resolución en un laboratorio.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Hansen’s disease presents a wide spectrum of clinical and histopathological manifestations that reflect the nature of the immunological response of the host towards diverse Mycobacterium leprae components. The immunological system, composed by both innate and adaptive immunology, offers protection towards infections of various etiologies, among them bacterial. Bacteria, of course, have developed multiple strategies for evading host defenses, based on either very complex or simple mechanisms, but with a single purpose: to “resist” host attacks and to be able to survive. We have tried to summarize some recent studies in Hansen’s disease, with more emphasis in the inmunology area. We think that in the future, all illnesses should also be very strongly related to other important aspects such as the social, environmental and economic, and whose development is not solved in a laboratory.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Enfermedad de Hansen]]></kwd>
<kwd lng="es"><![CDATA[respuesta inmune]]></kwd>
<kwd lng="es"><![CDATA[inmunidad innata]]></kwd>
<kwd lng="es"><![CDATA[inmunidad adquirida]]></kwd>
<kwd lng="es"><![CDATA[citocinas]]></kwd>
<kwd lng="es"><![CDATA[aspectos genéticos]]></kwd>
<kwd lng="es"><![CDATA[estados reaccionales]]></kwd>
<kwd lng="en"><![CDATA[Hansen’s disease]]></kwd>
<kwd lng="en"><![CDATA[immune response]]></kwd>
<kwd lng="en"><![CDATA[innate immunity]]></kwd>
<kwd lng="en"><![CDATA[adaptative immunity]]></kwd>
<kwd lng="en"><![CDATA[genetic influences]]></kwd>
<kwd lng="en"><![CDATA[reaction leprosy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <BASEFONT SIZE="3">     <P ALIGN="center" style="line-height: 100%"> <B><font color="#1f1a17" face="Verdana" size="3">Respuesta inmunitaria de la enfermedad de Hansen. Revisi&#243;n.</font></B> </P>     <P ALIGN="center" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Elsa Rada, Nacarid Aranzazu y Jacinto Convit.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Laboratorio de Bioqu&#237;mica, Instituto de Biomedicina, Universidad Central  de Venezuela, Ministerio de Salud. Caracas, Venezuela.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><font COLOR="#1f1a17" face="Verdana" size="2">Autor de correspondencia: Elsa Rada. Laboratorio de Bioquímica, Instituto de Biomedicina, Universidad Central de Venezuela, Apartado 4043. Caracas 1010A, Venezuela. Correo electrónico: <a href="mailto:elsa.rada@gmail.com">elsa.rada@gmail.com</a></font></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Resumen</FONT></B><FONT COLOR="#1f1a17" face="Verdana"><B>. </B>La enfermedad de Hansen presenta un amplio espectro de manifestaciones  cl&#237;nicas e histopatol&#243;gicas, las cuales son un reflejo de la naturaleza  de la respuesta inmunol&#243;gica del individuo ante diversos componentes del  <I>Mycobacterium leprae.</I> El sistema inmunol&#243;gico, integrado por la existencia  de una inmunidad innata y adaptativa, ofrece protecci&#243;n frente a infecciones  de diversas etiolog&#237;as, entre ellas las bacterianas. Por supuesto las bacterias  han logrado desarrollar m&#250;ltiples estrategias para evadir las defensas  del hospedador, que se basan en mecanismos algunos muy complejos y otros  m&#225;s simples, pero con una sola finalidad de &#147;resistir&#148; el ataque del hospedador  y lograr sobrevivir. Estudios realizados en la enfermedad de Hansen han  podido determinar los diferentes componentes que puedan estar actuando  tanto en la inmunidad innata c&#243;mo en la adquirida. En este trabajo se trata  de resumir algunos estudios recientes en la enfermedad de Hansen con mayor  &#233;nfasis en el &#225;rea de inmunolog&#237;a, sin dejar de considerar que toda enfermedad  debe estar muy ligada a otros aspectos tan igual de importantes c&#243;mo son  los sociales, ambientales y otros de muy dif&#237;cil resoluci&#243;n en un laboratorio.</FONT></font></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Palabras clave:&nbsp;</FONT></B><FONT COLOR="#1f1a17" face="Verdana">Enfermedad de Hansen, respuesta inmune, inmunidad innata, inmunidad adquirida,  citocinas, aspectos gen&#233;ticos, estados reaccionales.</FONT></font></P>     <P ALIGN="center" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana">Immune response of Hansen&#180;s disease. Review.</FONT></B></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Abstract. </FONT> </B><FONT COLOR="#1f1a17" face="Verdana"> Hansen&#146;s disease presents a wide spectrum of clinical and histopathological  manifestations that reflect the nature of the immunological response of  the host towards diverse <I>Mycobacterium leprae</I> components. The immunological  system, composed by both innate and adaptive immunology, offers protection  towards infections of various etiologies, among them bacterial. Bacteria,  of course, have developed multiple strategies for evading host defenses,  based on either very complex or simple mechanisms, but with a single purpose:  to &#147;resist&#148; host attacks and to be able to survive. We have tried to summarize  some recent studies in Hansen&#146;s disease, with more emphasis in the inmunology  area. We think that in the future, all illnesses should also be very strongly  related to other important aspects such as the social, environmental and  economic, and whose development is not solved in a laboratory.</FONT></font></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Key words:&nbsp;</FONT></B><FONT COLOR="#1f1a17" face="Verdana">Hansen&#146;s disease, immune response, innate immunity, adaptative immunity,  genetic influences, reaction leprosy.</FONT></font></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Recibido: 21-10-2008. Aceptado: 12-03-2009.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> INTRODUCCI&#211;N</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La lepra contin&#250;a siendo un problema de salud p&#250;blica en muchas partes  del mundo. El control de la enfermedad ha mejorado con la introducci&#243;n  del tratamiento con la terapia multidroga, reduciendo dram&#225;ticamente la  prevalencia. Sin embargo, el n&#250;mero de nuevos casos detectado anualmente  (incidencia) ha permanecido relativamente constante en los &#250;ltimos 20 a&#241;os  (1).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En este trabajo se trata de resumir algunos estudios recientes en la enfermedad  de Hansen con mayor &#233;nfasis en el &#225;rea de inmunolog&#237;a.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La enfermedad de Hansen presenta un amplio espectro de manifestaciones  cl&#237;nicas e histopatol&#243;gicas, las cuales son un reflejo de la naturaleza  de la respuesta inmunol&#243;gica del individuo ante el <I>Mycobacterium leprae.  </I>Tomando en cuenta la clasificaci&#243;n Ridley-Jopling (2) seg&#250;n su respuesta  inmunol&#243;gica, tenemos la lepra lepromatosa (LL), forma polar severa y progresiva,  la cual se caracteriza por un largo per&#237;odo de incubaci&#243;n (latencia) con  un promedio de siete a&#241;os o m&#225;s y con una expresi&#243;n histol&#243;gica de un granuloma  formado fundamentalmente por macr&#243;fagos no diferenciados, con enormes n&#250;meros  de bacilos en el interior de los macr&#243;fagos mostrando un grado variable  de vacuolizaci&#243;n (&#147;c&#233;lulas espumosas&#148;). En la lepra tuberculoide (TT),  forma polar de cierta resistencia, las lesiones se presentan en menor cantidad  con caracter&#237;sticas histopatol&#243;gicas bien definidas; y est&#225; formada por  granulomas epitelioides que ocupan toda la dermis con un importante n&#250;mero  de linfocitos, sobre todo en la periferia, macr&#243;fagos diferenciados (c&#233;lulas  epitelioides) y c&#233;lulas gigantes tipo Langhans. Existe un grupo intermedio:  el borderline lepromatoso (BL), el borderline tuberculoide (BT) y la forma  intermedia que puede progresar hacia el polo tuberculoide o lepromatoso  (2).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> INMUNOLOG&#205;A EN LEPRA</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En relaci&#243;n a la poblaci&#243;n general aproximadamente un 80% es naturalmente  resistente a la enfermedad. Del 20% restante, 16-18% constituye el grupo  que se define como reactores lentos (grupo tuberculoide) y el 2-4% constituye  el grupo de an&#233;rgicos (grupo lepromatoso).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El sistema inmunol&#243;gico, integrado por la existencia de una inmunidad innata  y adaptativa, ofrece protecci&#243;n frente a infecciones de diversas etiolog&#237;as,  entre ellas las bacterianas. Por supuesto las bacterias han logrado desarrollar  m&#250;ltiples estrategias para evadir las defensas del hospedador, que se basan  en mecanismos algunos muy complejos y otros m&#225;s simples, pero con una sola  finalidad de &#147;resistir&#148; el ataque del hospedador y lograr sobrevivir.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> CARACTER&#205;STICAS Y COMPONENTES DE LOS ELEMENTOS DE LA INMUNIDAD INNATA</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La inmunidad innata constituye la primera l&#237;nea de defensa que opera en  la fase temprana y se refiere a la protecci&#243;n contra la infecci&#243;n que depende  de mecanismos eficientes existentes en el hospedador antes de que esta  ocurra. Los mecanismos de inmunidad innata son capaces de dar una respuesta  r&#225;pida pero inespec&#237;fica a los microorganismos. Se fundamenta principalmente  en:</FONT></P>     ]]></body>
<body><![CDATA[<blockquote>       <p ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> - La respuesta inflamatoria, con la activaci&#243;n de ciertas v&#237;as de complemento  y la fagocitosis (participaci&#243;n de diferentes tipos de receptores).</FONT>    <p ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> - La respuesta inflamatoria es estimulada por productos bacterianos como  polisac&#225;ridos, carbohidratos, los peptidoglicanos, activando a los macr&#243;fagos,  los cuales secretan factor de necrosis tumoral (TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">), interleucina 1  (IL-1) y quimiocinas que inducen la infiltraci&#243;n leucocitaria en los focos  de infecci&#243;n.</FONT> </blockquote>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En cuanto a la activaci&#243;n del complemento es un sistema de prote&#237;nas del  suero y de la superficie celular que interaccionan entre s&#237; y con otras  del sistema inmunitario. La activaci&#243;n del complemento tiene m&#250;ltiples  resultados, pues permite: la neutralizaci&#243;n, la opsonizaci&#243;n, estimula  la fagocitosis y conduce a la formaci&#243;n del complejo de ataque a la membrana  (CAM), que induce la lisis de las bacterias. Adem&#225;s, los productos liberados  del complemento (entre ellos, C5a y C3a, que son anafilotoxinas) participan  en las respuestas inflamatorias reclutando y activando leucocitos. Otros  compuestos solubles tales como C3b, C3bi y C3d, act&#250;an como opsoninas que  facilitan la fagocitosis.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Hay una serie de estudios realizados en la enfermedad de Hansen donde se  ha podido profundizar los diferentes componentes que pueden estar actuando  en la inmunidad innata.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> C&#201;LULAS PRESENTADORAS DE ANT&#205;GENOS Y C&#201;LULAS DENDR&#205;TICAS</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Las c&#233;lulas dendr&#237;ticas (CDs) juegan un importante rol en la respuesta  inmune innata frente al <I>M. leprae </I>(3). En la piel y otras superficies epiteliales  como la mucosa nasal las CDs pueden ser el primer punto de encuentro con  el <I>M. leprae</I>.<I> </I>Algunos investigadores reportan una disminuci&#243;n en la expresi&#243;n  de las mol&#233;culas de superficie del complejo mayor de histocompatibilidad  (MHC) clase I y clase II en dichas c&#233;lulas. Otros investigadores encuentran  un aumento en la expresi&#243;n de las mol&#233;culas MHC clase II y en CD40 ligando  con la producci&#243;n de IL-12 cuando las CDs son estimuladas con ant&#237;genos  de membrana de <I>M. leprae</I>, sugiriendo que la presencia del bacilo completo  puede suprimir la interacci&#243;n entre las CDs y los linfocitos T en las diferentes  formas cl&#237;nicas de la enfermedad (4-6).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> RECEPTORES DE RECONOCIMIENTO DE PATRONES</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Adem&#225;s, existen los patrones moleculares asociados a pat&#243;genos (PAMPs),  como los peptidoglicanos, los &#225;cidos lipoteicoicos, los mananos, la endotoxina  lipopolisac&#225;rido de bacterias Gram negativas, glicanos, ARN de doble cadena  y ADN bacteriano (7), que son mol&#233;culas expresadas con mucha frecuencia  por los pat&#243;genos microbianos y no se encuentran en las c&#233;lulas del hospedador.  S&#237; son reconocidas por las c&#233;lulas presentadoras de ant&#237;genos (CPA), ya  que &#233;stas utilizan varios receptores de reconocimiento de patrones que  expresan en su superficie, entre los cuales se podr&#237;an mencionar:</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> a) Receptor Lectina tipo C</FONT></B> </P>     ]]></body>
<body><![CDATA[<P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El receptor de la manosa, llamado CD206, que facilita la fagocitosis de  los microorganismos, se expresa principalmente en c&#233;lulas de la l&#237;nea mieloide,  especialmente macr&#243;fagos maduros donde el mayor ligando micobacterial es  el lipoaraminomanosa (uno de los componentes de la capsula bacilar) actuando  como inmunomoduladora de la respuesta inmune (8). Se conoce que la penetraci&#243;n  de la bacteria v&#237;a el receptor de la manosa no permite que suceda el desarrollo  del estallido respiratorio (9, 10). Otra lectina tipo C son las mol&#233;culas  de adhesi&#243;n intercelulares no integrina-espec&#237;fica de las CD (CD-SIGN o  llamadas CD209) (11). Algunos investigadores proponen que micobacterias  virulentas pueden destruir la funci&#243;n de las CD v&#237;a CD-SIGN, posiblemente  a trav&#233;s de la inhibici&#243;n en la producci&#243;n de IL-12 y en la inducci&#243;n de  IL-10 (12, 13). La Langerina &#243; CD207 es otro receptor expresado en c&#233;lulas  de Langerhans que reconoce patrones tipo C donde carbohidratos micobacterianos  son endocitados v&#237;a langerina y son transportados a los gr&#225;nulos de Birbeck  para su procesamiento (14).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> b) Receptores Toll-Like (TLR)</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Son una familia de prote&#237;nas transmembranas que forma parte de la mayor&#237;a  de las c&#233;lulas que conforman el sistema inmunitario, tales como monocitos/macr&#243;fagos  y neutr&#243;filos. La evidencia indica que los TLR reconocen distintos componentes  microbianos y regulan la activaci&#243;n de la inmunidad innata as&#237; como tambi&#233;n  la adquirida (15) donde los homod&#237;meros TLR2 y TLR4 son los de mayor reconocimiento  de<FONT COLOR="#ff0000" FACE="Caslon224 Bk BT" SIZE="3"> </FONT><FONT COLOR="#1f1a17">micobacterias (16-19). Recientemente, se encontr&#243; la participaci&#243;n del  receptor TLR2 aunado al papel que desempe&#241;a las CD en el reconocimiento  frente al <I>M. leprae</I>,<I> </I>de acuerdo a la producci&#243;n de citocinas (20-22).</FONT></FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La activaci&#243;n de los monocitos provenientes de pacientes TT v&#237;a TLR2 inducen  a la diferenciaci&#243;n de los macr&#243;fagos a CD-SIGN+ y a c&#233;lulas dendr&#237;ticas  CD1b+. A diferencia de los monocitos de sangre perif&#233;rica estimulados con  ant&#237;genos micobacterianos, solo los macr&#243;fagos se diferencian al fenotipo  CD-SIGN+. La estimulaci&#243;n de los monocitos v&#237;a TLRs es activada tanto en  paciente tuberculoides como en lepromatosos pero estos &#250;ltimos son incapaces  de desarrollar una respuesta inmune adaptativa (23).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> c) </FONT></B> <FONT COLOR="#1f1a17" face="Verdana">  <B>Receptores del complemento</B></FONT></font></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El complemento es un sistema de prote&#237;nas del suero y de la superficie  celular que interaccionan entre s&#237; y con otras del sistema inmunitario.  La activaci&#243;n del complemento tiene m&#250;ltiples resultados, pues permite  la neutralizaci&#243;n, la opsonizaci&#243;n, estimula la fagocitosis y conduce a  la formaci&#243;n del complejo de ataque a la membrana, que induce la lisis  de algunas bacterias. Ser&#237;a pertinente comentar la existencia de receptores  del complemento (CR1, CR2, CR3 y CR4 presentes en los fagocitos que permiten  unir a las bacterias opsonizadas, cobrando una importante funci&#243;n en el  desarrollo de la respuesta protectora del individuo (24).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Evidentemente, la presencia de receptores de la inmunidad innata que facilitan  la entrada de los bacilos al interior de c&#233;lulas fagocitarias podr&#237;a conducir  a la digesti&#243;n del bacilo de <I>M. leprae</I> si se activan los mecanismos apropiados.  En la ausencia de estos mecanismos, los receptores tendrian el efecto opuesto  de facilitar el alojamiento del bacilo en su celula hospedador e iniciar  su multiplicaci&#243;n. La observaci&#243;n se&#241;alada arriba, la resistencia de un  80% de la poblaci&#243;n a la infecci&#243;n cl&#237;nica con <I>M. leprae </I>podr&#237;a reflejar  la alta eficacia de los mecanismos de inmunidad innata en esta enfermedad,  siempre asociada con la constituti&#243;n g&#233;netica del hospedador.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En cuanto a los mecanismos bactericidas que presenta el macr&#243;fago frente  al <I>M. leprae</I> tenemos la producci&#243;n de intermediarios reactivos oxigenados  y nitrogenados (<a href="#fig1">Fig. 1</a>). La bacteria presenta mecanismos de evasi&#243;n donde  se observa la baja producci&#243;n de radicales de ox&#237;genos por parte del macr&#243;fago  en presencia del glicol&#237;pido fen&#243;lico-1 (25, 26).</FONT></P>     <P ALIGN="center" style="line-height: 100%"><a name="fig1"> <img border="0" src="/img/fbpe/ic/v50n4/art11fig1.gif" width="579" height="338"></a></P>     
<P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> &#211;XIDO N&#205;TRICO (ON)</FONT></B> </P>     ]]></body>
<body><![CDATA[<P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El &#243;xido n&#237;trico (ON) radical libre juega un papel importante en la respuesta  inmune innata del hu&#233;sped; la producci&#243;n elevada de ON estar&#237;a asociada  a cuadros inflamatorios agudos. El ON es altamente inestable y se transforma  en nitritos/nitratos. Aun cuando escasos, algunos trabajos han demostrado  la elevada producci&#243;n de oxido n&#237;trico en c&#233;lulas humanas <I>in vitro. </I>Los  macr&#243;fagos activados indudablemente juegan un papel importante en la resistencia  del hu&#233;sped a infecciones bacterianas. La iNOS es la enzima sintasa inducible  del &#243;xido n&#237;trico responsable de la s&#237;ntesis sostenida y elevada de ON  por macr&#243;fagos activados. Muchos datos sobre des&#243;rdenes con reacciones  pro-inflamatorias Th1 involucran a macr&#243;fagos activados y neutr&#243;filos,  se&#241;alando una actividad destructiva por la expresi&#243;n de la iNOS, contribuyendo  as&#237; al da&#241;o tisular local (27). El ON podr&#237;a jugar un papel microbicida  que ha sido poco investigado en Hansen (28). La persistencia <I>in vivo </I>por  parte de organismos micobacterianos demuestra de un mecanismo enzim&#225;tico  oxido-redox eficiente que contribuye a evadir la respuesta inmune por parte  del hospedador (29).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> CARACTER&#205;STICA Y COMPONENTES DE LA INMUNIDAD ADAPTATIVA</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En contraposici&#243;n con la inmunidad innata y sus mecanismos de defensa,  existen otros que tambi&#233;n son estimulados tras la exposici&#243;n a agentes  infecciosos pero que son mucho m&#225;s evolucionados, espec&#237;ficos, diversos,  autolimitados y cuya capacidad e intensidad defensiva aumenta despu&#233;s de  la exposici&#243;n repetida a un microorganismo; es decir, ofrecen al individuo  &#147;inmunidad protectora&#148; ya que posee memoria. Este tipo de respuesta constituye  el sistema inmune adaptativo, el cual a su vez se divide en: Inmunidad  celular, en la que participan los linfocitos T e Inmunidad humoral (mediada  por anticuerpos).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> INMUNIDAD MEDIADA POR C&#201;LULAS</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El reconocimiento de ant&#237;genos por parte de los linfocitos T es un evento  indispensable para el desarrollo de la respuesta inmune espec&#237;fica. La  falta de respuesta en pacientes con lepra lepromatosa es espec&#237;fica para  los ant&#237;genos de <I>M. leprae</I> (30).<I> </I>Actualmente est&#225; en estudio la b&#250;squeda  de ant&#237;genos micobacterianos espec&#237;ficos que permitan hacer un diagn&#243;stico  temprano de las formas resistentes de la lepra (paucibacilares, con pocos  bacilos) (31, 32); como se ver&#225; mas adelante las formas multibacilares  frecuentemente presentan altos niveles de anticuerpos contra el GLP-1 de  <I>M. leprae </I>en el momento del diagn&#243;stico.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Desde el punto de vista inmunol&#243;gico en la respuesta inmune celular, se  observa una disminuci&#243;n altamente especifica a <I>M. leprae </I>(33, 34) que se  expresa con intensidad variable en las diferentes formas cl&#237;nicas de la  enfermedad, estructurando un espectro que va desde la lepra lepromatosa,  en el cu&#225;l hay una ausencia total de fen&#243;menos de inmunidad mediada por  c&#233;lulas hacia el <I>M. leprae, </I>hasta la lepra tuberculoide, donde estan presentes  los fen&#243;menos de inmunidad celular cuyo defecto es moderado; es decir,  los linfocitos T de sangre perif&#233;rica de estos pacientes proliferan en  respuesta al est&#237;mulo con el microorganismo intacto y con el extracto soluble  de <I>M. Ieprae </I>(35)<I>.</I></FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Algunos componentes espec&#237;ficos del <I>M. leprae </I>podr&#237;an jugar un papel en  el desarrollo de una respuesta protectora mediada por linfocitos T. Recientemente,  se ha avanzado en la b&#250;squeda de ant&#237;genos que tengan un potencial inmunog&#233;nico  con la finalidad de desarrollar una inmunidad protectora en el hospedador  (36).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Los mecanismos de anergia que suceden espec&#237;ficamente en lepra lepromatosa  han sido sujeto a una intensa investigaci&#243;n en los &#250;ltimos 20 a&#241;os. Hay  mucha discusi&#243;n sobre la naturaleza del estado de anergia y su inducci&#243;n;  hay varios modelos que soportan este punto. El modelo m&#225;s relevante es  el caracterizado por la dicotom&#237;a Th1 y Th2, basado en la producci&#243;n de  perfiles diferentes de citocinas supresoras o protectoras (37-39) Otro  modelo postula la presencia de subpoblaciones de linfocitos T (linfocitos  reguladores) que son activadas por ep&#237;topes supresores del <I>M. leprae</I> (30).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> M&#225;s recientemente, se conoce que los linfocitos T pueden presentar apoptosis.  Hay varias condiciones que la inducen, entre ellas tenemos: la eliminaci&#243;n  de ciertas citocinas (40), la presencia del receptor de alta afinidad de  TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">  (41) y la tercera forma de inducci&#243;n de la apoptosis ser&#237;a la llamada  muerte celular inducida por activaci&#243;n (AICD) (42). La apoptosis ocurre  en pacientes con enfermedad de Hansen tanto en pacientes multibacilares  c&#243;mo en paucibacilares, pero es mucho m&#225;s frecuentes en pacientes con alta  carga bacilar y en pacientes en presencia de reacciones tipo 2 (43-45).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Recientemente, se demostr&#243; la importancia de la v&#237;a proteasoma-ubiquitina  en relaci&#243;n a la respuesta inmune frente a pat&#243;genos bacterianos. C&#233;lulas  mononucleares provenientes de sangre perif&#233;rica (PBMC) tratadas con un  inhibidor de proteasoma reducen significativamente la apoptosis mediada  por el <I>M. leprae </I>e igualmente hubo una disminuci&#243;n de los niveles de producci&#243;n  de TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> e IL-10 (46).</FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> POBLACI&#211;N DE LINFOCITOS T</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La relaci&#243;n T CD4<FONT COLOR="#1f1a17"><SUP>+</SUP>CD3<SUP>+</SUP>/ TCD8<SUP>+</SUP>CD3<SUP>+</SUP> es de 1.9 a 1 en lesiones de pacientes  tuberculoides donde las poblaciones de linfocitos T CD4<SUP>+ </SUP>est&#225;n distribuidas  en toda la lesi&#243;n y las T CD8<SUP>+</SUP> se encuentran en la periferia. En contraste,  en las lesiones de pacientes lepromatosos la relaci&#243;n CD4<SUP>+</SUP>CD3<SUP>+</SUP>/ CD8<SUP>+</SUP>CD3<SUP>+ </SUP>es de 0.6 a 1 donde los linfocitos T CD8<SUP>+ </SUP>CD3<SUP>+ </SUP>se distribuye dentro de  la lesi&#243;n (47).</FONT></FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> C&#201;LULAS CITOT&#211;XICAS</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La lisis de la c&#233;lula blanco por parte de los linfocitos T citot&#243;xicos  CD8<FONT COLOR="#1f1a17"><SUP>+</SUP>CD3<SUP>+</SUP> es realizado por gr&#225;nulos citot&#243;xicos y perforinas as&#237; como la  granzyme B, una proteasa de serina. La granulosina es otra prote&#237;na antimicrobiana  presente en los linfocitos T y est&#225; expresada en pacientes con tuberculosis  y lepra. La presencia de granulosina est&#225; presente en las lesiones de pacientes  con Hansen siendo m&#225;s frecuente en biopsia de pacientes TT (48-50).</FONT></FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> MACR&#211;FAGOS&nbsp; </FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Los mecanismos de defensa frente a bacterias intracelulares requieren la  participaci&#243;n de macr&#243;fagos, c&#233;lulas asesinas naturales y diversas poblaciones  de linfocitos T. El macr&#243;fago es una de las primeras c&#233;lulas en captar  al <I>M. leprae</I> y en ausencia de un mecanismo efectivo de inmunidad mediada  por c&#233;lulas los bacilos se multiplican dentro de las c&#233;lulas macrof&#225;gicas.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> CITOCINAS EN LEPRA</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El paradigma Th1/Th2 se ha postulado para intentar explicar resistencia  o susceptibilidad frente a pat&#243;genos intracelulares. Se basa en los patrones  de producci&#243;n de citocinas en diversos estados infecciosos. Los linfocitos  T que producen interleucina 2 (IL-2) e interferon </FONT> <FONT COLOR="#1f1a17"> <FONT COLOR="#1f1a17" size="2" face="Symbol"> g</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana"> (IFN-</FONT></FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">g</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">), IL-7, IL-12,  IL-15, IL-18, asociados con la respuesta tipo Th1, aumenta la inmunidad  mediada por c&#233;lulas (38, 48, 51, 52). Los linfocitos T que producen IL-4,  IL-5, IL-10, IL-13, respuesta Th2 (37) aumentan la respuesta humoral (53).  Las subpoblaciones celulares tipo Th1 y Th2 provienen de un precursor com&#250;n,  los linfocitos Th0, estas c&#233;lulas no est&#225;n diferenciadas y secretan ambas  citocinas tipo Th1 y Th2. Estudios previos realizados en la forma estable  de lepra lepromatosa polar, mostraron una mezcla de patrones de citocinas:  40% con un perfil Th2, 50% con perfil Th0 y el resto no mostr&#243; ninguno  de estos patrones. Es importante se&#241;alar que c&#233;lulas accesorias pueden  alterar el perfil de citocinas en cultivos reconstituidos, sugiriendo su  importancia en la diferenciaci&#243;n de sub-poblaciones de linfocitos T cooperadores  (Th) (54). Una tercera subpoblaci&#243;n de linfocitos T CD4<SUP>+ </SUP>CD3<SUP>+ </SUP>(Th3), poblaci&#243;n  supresora o reguladora de la inmunidad mediada por c&#233;lulas, puede ser activada  en la forma de lepra lepromatosa en la presencia de grandes cantidades  de IL-4, induciendo la producci&#243;n de TGF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">b</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">1 (55, 56) (<a href="#fig2">Fig. 2</a>).</FONT></P>     <P ALIGN="center" style="line-height: 100%"><a name="fig2"> <img border="0" src="/img/fbpe/ic/v50n4/art11fig2.gif" width="574" height="418"></a></P>     
<P ALIGN="justify" style="line-height: 100%"><font face="Verdana"> <B><FONT COLOR="#1f1a17" size="2"> FACTOR ALFA DE NECROSIS TUMORAL Y INTERFER&#211;N GAMMA (TNF-</FONT></B></font><FONT COLOR="#1f1a17" face="Symbol" size="2"><b>a</b></FONT> <B><FONT COLOR="#1f1a17" size="2"> <font face="Verdana"> Y IFN-</font></FONT><FONT COLOR="#1f1a17" size="2" face="Symbol">G</FONT><font face="Verdana" COLOR="#1f1a17" size="2">)</font></B></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En cuanto a citocinas de inter&#233;s como el factor de necrosis tumoral-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">  (TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2">)  y el interfer&#243;n gamma (IFN-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">g</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2">), el TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> es una citocina liberada por monocitos,  macr&#243;fagos, c&#233;lulas NK, mastocitos y neutr&#243;filos (PMN) en respuesta a infecci&#243;n,  sepsis, a ciertos ant&#237;genos &#243; a da&#241;o (57-60). &#201;sta y otras citocinas proinflamatorias,  incluyendo la IL-1</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">b</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> son liberadas <I>in vivo</I> e <I>in vitro</I> durante los episodios  reaccionales en lepra (61, 62). Una elevada liberaci&#243;n de TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> en pacientes  con la forma tuberculoide (paucibacilar) comparada con la forma multibacilar  sugiere que esta citocina contribuye al proceso de resistencia de la respuesta  inmune frente a la infecci&#243;n micobacteriana. Sin embargo, una elevada liberaci&#243;n  en pacientes con estado reaccional tipo ENL indica que el TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> pueda mediar  efectos inmunopatol&#243;gicos as&#237; c&#243;mo fiebre y da&#241;o a tejido (63). La evidencia  de receptores TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> soluble presentes en el suero de los pacientes con  lepra podr&#237;a indicar la presencia de un mecanismo regulatorio para modular  la actividad excesiva de TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> alcanzado en respuesta al da&#241;o severo &#243;  infecci&#243;n. Se ha encontrado un elevado n&#250;mero de receptores tipo I de factor  de necrosis tumoral-a soluble (sTNF-RI) en pacientes con lepra lepromatosa  en estado reaccional tipo 2, a diferencia de los receptores tipo II (sTNF-RII);  los cuales se hallaron incrementados en pacientes con la forma tuberculoide  (64, 65).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El IFN-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">g</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> es bien conocido por su habilidad de aumentar la producci&#243;n de  intermediarios reactivos de ox&#237;geno y de nitr&#243;geno por parte del macr&#243;fago,  estimulando a dicha c&#233;lula y por consiguiente restringiendo la proliferaci&#243;n  de las micobacterias u otros pat&#243;genos intracelulares (66, 67). En este  sentido ciertos ant&#237;genos micobacterianos tanto de la pared celular c&#243;mo  del citosol inducen una buena respuesta de IFN-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">g</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> (36, 68).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> ESTADOS REACCIONALES Y SU AMBIENTE DE CITOCINAS</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Los estados reaccionales pueden ocurrir antes, durante e incluso despu&#233;s  de tratamiento cuando el paciente es considerado curado bacteriol&#243;gicamente.  Las reacciones en Hansen pueden ser definidas c&#243;mo manifestaciones cl&#237;nicas  resultado de alteraciones del balance inmunol&#243;gico debido a la interacci&#243;n  entre el sistema inmune del hospedador y el agente infectante. Estas reacciones  agudas afectan principalmente piel y nervios y son la primera causa de  morbilidad e incapacidad, principalmente por alteraciones en las funciones  de los nervios perif&#233;ricos.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Reacciones tipo 1 &#243; reacciones de reversi&#243;n ocurren frecuentemente en pacientes  paucibacilares. C&#243;mo hab&#237;amos mencionado anteriormente, parecen estar asociadas  a un aumento abrupto de la respuesta inmune mediada por c&#233;lulas contra  ant&#237;genos de <I>M. leprae </I>(69). Usando la t&#233;cnica de RT-PCR, se ha demostrado  un aumento en la expresi&#243;n de RNA mensajeros que codifican para citocinas  IL-1</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">b</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">, TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2">, IL-2 e IFN</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">g</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2">, dando un patr&#243;n t&#237;pico de una respuesta Th1,  mientras que el patr&#243;n tipo Th2 (IL-4, IL-5 e IL-10) se encontr&#243; disminuido.  Mediante inmunohistoqu&#237;mica se ha demostrado la presencia de citocinas  c&#243;mo IFN-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">g</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> y TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2"> asociadas a la detecci&#243;n de la enzima &#243;xido n&#237;trico  sintasa inducible (iNOS) (39).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> En referencia a las reacciones del tipo 2, la m&#225;s frecuente es la del tipo  eritema nodoso leproso (ENL) que ocurre en pacientes multibacilares y es  caracter&#237;stico de una reacci&#243;n inflamatoria sist&#233;mica, presentando una  inmunopatolog&#237;a m&#225;s compleja. En algunos pacientes estas reacciones pueden  ser cr&#243;nicas y puede suceder una vez terminado el tratamiento. Ha sido  demostrado que durante el ENL hay un aumento selectivo de la expresi&#243;n  de RNA mensajero para IL-6, IL-8 e IL-10 en las lesiones, indicando una  respuesta tipo Th2 (39).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Es importante se&#241;alar que el tratamiento de los episodios reaccionales  constituye una de las principales prioridades en el manejo de los pacientes  con enfermedad de Hansen para prevenir incapacidades. El tratamiento debe  ser individualizado con las drogas anti-inflamatorias no esteroideas (AINES)  para el caso de cuadros leves y esteroideas para los procesos neur&#237;ticos.  Es importante se&#241;alar la talidomida, un derivado del &#225;cido glut&#225;mico, una  droga altamente efectiva en el fen&#243;meno reaccional y es usada con precauci&#243;n  en mujeres en edad f&#233;rtil debido a su efecto teratog&#233;nico. Desde 1998 la  US FDA la consider&#243; como tratamiento alternativo de elecci&#243;n en las manifestaciones  agudas cut&#225;neas, entre &#233;llas podemos citar para tratamiento de ENL (70)  se utiliza 400mg diarios durante una semana hasta atenuaci&#243;n del fen&#243;meno  reacciona. Su acci&#243;n es antiinflamatoria, provoca una alteraci&#243;n de la  s&#237;ntesis y liberaci&#243;n de citocinas c&#243;mo TNF-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">a</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2">, IL-1, IL-2, IL-4, IL-6,  IL-8, IL10, IL-12 y IFN-</FONT><FONT COLOR="#1f1a17" face="Symbol" size="2">g</FONT><FONT COLOR="#1f1a17" face="Verdana" size="2">. Las c&#233;lulas blanco de la talidomida son los  leucocitos, c&#233;lulas endoteliales y queratinocitos afect&#225;ndolos de una manera  diferente a cada uno de ellos. Se observan cambios en la densidad de las  mol&#233;culas de adhesi&#243;n, con alteraci&#243;n en la extravasaci&#243;n celular y por  consiguiente en la respuesta inflamatoria de los tejidos involucrados (71-74).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Otro aspecto de tomar en cuenta en la enfermedad de Hansen es en referencia  a la inmunogen&#233;tica. La influencia gen&#233;tica en la susceptibilidad o resistencia  de los individuos en esta enfermedad ha sido discutida desde hace muchas  d&#233;cadas. Actualmente, esta interrogante esta siendo vista de dos formas:  existe un control gen&#233;tico de la susceptibilidad a la lepra?, &#243; existe  un control gen&#233;tico de la expresi&#243;n cl&#237;nica de la enfermedad?</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> INFLUENCIAS GEN&#201;TICAS SOBRE LA RESPUESTA INMUNE ADQUIRIDA</FONT></B> </P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Ant&#237;genos leucocitarios humanos (HLA)</FONT></B></font></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estudios previos realizados en diferentes partes del mundo entre ellos  Venezuela y China, demostraron que en los pacientes de la forma cl&#237;nica  tuberculoide el HLA que predomina es el HLA-DR2 y HLA-DR3 a diferencia  de la forma lepromatosa (incapaz de controlar la multiplicaci&#243;n del bacilo)  donde el HLA m&#225;s frecuente es el D-Q1 (75-78).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Cromosoma 10P13</FONT></B></font></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estudios realizados pacientes con enfermedad de Hansen en el sur de la  India encontraron marcadores gen&#233;ticos en el cromosoma 10p13. Muchos de  estos pacientes presentaron lepra paucibacilar y no est&#225; claro si estos  marcadores est&#225;n relacionados con susceptibilidad a la enfermedad &#243; con  el tipo de lepra de la forma tuberculoide (79).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Prote&#237;nas asociadas a transporte (TAP)</FONT></B></font></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> La prote&#237;na asociada a transporte en el procesamiento de ant&#237;genos (TAP)  es una prote&#237;na compuesta de dos polipeptidos, TAP1 y TAP2. El gen de TAP2  est&#225; asociada con lepra tuberculoide. Este gen est&#225; muy estrechamente asociado  con los genes de HLA, as&#237; que los resultados dificultan su interpretaci&#243;n  (80).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Factor alfa de necrosis tumoral</FONT></B></font></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> El factor de necrosis tumoral es asociado con resistencia frente al <I>M.  leprae</I>; por ejemplo los niveles de TNF-<FONT COLOR="#1f1a17">  </FONT> </FONT><FONT COLOR="#1f1a17" face="Symbol" size="2"> a</FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">  en suero son elevados en pacientes  con lepra tuberculoide. En reacciones del tipo 1 &#243; de reversi&#243;n, la expresi&#243;n  de esta citocina est&#225; igualmente incrementada en las lesiones en estas  manifestaciones de lepra. El gen de TNF- </FONT><FONT COLOR="#1f1a17" size="2" face="Symbol">  a </FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">  est&#225; localizado en el cromosoma  6p21 y el polimorfismo de la regi&#243;n promotora es de gran inter&#233;s como modulador  de la respuesta del hospedador y de la forma cl&#237;nica presente en la enfermedad.  Estudios gen&#233;ticos realizados en la India y Brasil asocian las diferencias  encontradas en los alelos de TNF- </FONT><FONT COLOR="#1f1a17" size="2" face="Symbol">  a </FONT><FONT COLOR="#1f1a17" size="2" face="Verdana">  con el tipo de lepra (81, 82).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Receptores toll-like (TLR)</FONT></B></font></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estos receptores lo hemos mencionado anteriormente en la inmunidad innata.  Los genes que regulan los receptores TLR influyen de una manera importante  en los eventos tempranos de la respuesta inmune espec&#237;fica. Estudios realizados  en pacientes con lepra indican que la producci&#243;n de citocinas, se&#241;alizaci&#243;n  celular y otros aspectos en la resistencia a la infeci&#243;n por <I>M. leprae</I>  est&#225;n controlado por los receptores TLR-2 (83).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><font size="2"> <B><FONT COLOR="#1f1a17" face="Verdana"> Receptor de la vitamina D</FONT></B></font></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Estudios previos sugieren que el polimorfismo del gen para el receptor  de la vitamina D fue asociado con susceptibilidad a tuberculosis (84).  Diferentes estudios en pacientes con lepra indican que los alelos de este  gen est&#225;n asociados con lepra tuberculoide y con la forma lepromatosa (85).</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> No es f&#225;cil resumir la influencia de los factores g&#233;n&#233;ticos en las diversas  manifestaciones de la lepra. Parece evidente, bas&#225;ndose en la evidencia  presentada arriba, que la composici&#243;n gen&#233;tica ejerce una influencia sobre  la inmunidad innata y la adaptativa frente <I>M. leprae. </I>Hay un consenso ampliamente  aceptado que algunos de los factores gen&#233;ticos determinan la susceptibilidad  o resistencia frente al microorganismo y se podr&#237;a postular que la inmunidad  innata tendr&#237;a un papel preponderante en esta reactividad inicial. En cambio,  las distintas manifestaciones cl&#237;nicas aparentemente reflejan la modulaci&#243;n  de una infecci&#243;n ya establecida.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Hasta los momentos se ha hecho un gran avance en las diferentes disciplinas  que estudian la enfermedad tomando en cuenta que la bacteria hasta los  momentos no se ha podido cultivar en vitro. Hay aspectos de mucho inter&#233;s  que hay que seguir estudiando entre ellas las reacciones en lepra: del  tipo 1 y del tipo 2 porque hay cierta afinidad en algunos pacientes y otros  no. Un aspecto de suma importancia es el estudiar los mecanismos de da&#241;o  a nivel de nervios para prevenir las discapacidades.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Es importante se&#241;alar que el conocimiento y secuenciaci&#243;n del genoma micobacteriano  ha dado nueva directrices para la b&#250;squeda y s&#237;ntesis de nuevas prote&#237;nas  que nos permitan desarrollar nuevas alternativas para realizar un diagn&#243;tico  temprano dando un tratamiento oportuno y reducir la trasmisi&#243;n de la enfermedad.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> Los principios b&#225;sicos para el control de la lepra m&#225;s all&#225; del a&#241;o 2008  seguir&#225;n bas&#225;ndose en la detecci&#243;n y el tratamiento temprano de los pacientes.  Actualmente la meta de la estrategia mundial por parte de la OMS es reducir  m&#225;s la carga de la lepra y brindar acceso de control a todas las comunidades  afectadas. Si se toma en cuenta que el per&#237;odo latente de incubaci&#243;n de  las formas m&#225;s graves de la lepra puede ser de siete a&#241;os o m&#225;s y que puede  haber transmisi&#243;n durante la etapa pre-cl&#237;nica de la enfermedad, se reconoce  la necesidad de vigilancia continua durante un tiempo prolongado para lograr  esta meta.</FONT></P>     <P ALIGN="justify" style="line-height: 100%"> <B><FONT COLOR="#1f1a17" size="2" face="Verdana"> REFERENCIAS</FONT></B> </P>     <!-- ref --><P ALIGN="justify" style="line-height: 100%"><FONT COLOR="#1f1a17" size="2" face="Verdana"> 1.&nbsp;<B>WHO.</B> 2007. Global leprosy situation, 2007. Wkly. Epidemiol. 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