<?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>0016-3813</journal-id>
<journal-title><![CDATA[Gaceta médica de México]]></journal-title>
<abbrev-journal-title><![CDATA[Gac. Méd. Méx]]></abbrev-journal-title>
<issn>0016-3813</issn>
<publisher>
<publisher-name><![CDATA[Academia Nacional de Medicina de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0016-38132005000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La vía de CD1 y la activación de células T NK hacia los antígenos glicolipídicos de Mycobacterium tuberculosis]]></article-title>
<article-title xml:lang="en"><![CDATA[CD1 pathway and NK T Cell activation to glycolipid antigens from Mycobacterium]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sada-Ovalle]]></surname>
<given-names><![CDATA[Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torre-Bouscoulet]]></surname>
<given-names><![CDATA[Luis]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Martínez]]></surname>
<given-names><![CDATA[María del Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Cairo]]></surname>
<given-names><![CDATA[Salvador]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zenteno]]></surname>
<given-names><![CDATA[Edgar]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lascurain]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A02">
<institution><![CDATA[,IMSS Centro Médico Nacional Siglo XXI Coordinación de Investigación en Salud]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,UNAM Fac. Medicina Departamento de Bioquímica]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Enfermedades Respiratorias Unidad de Investigación Departamento de Bioquímica]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2005</year>
</pub-date>
<volume>141</volume>
<numero>1</numero>
<fpage>35</fpage>
<lpage>41</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0016-38132005000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0016-38132005000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0016-38132005000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El objetivo de esta revisión es analizar el estado actual de nuestro conocimiento sobre las moléculas de superficie celular involucradas en la presentación de antígenos glicolipídicos, denominadas familia CD1. Estas proteínas constituyen la tercera clase de moléculas presentadoras de antígeno. Las proteínas CD 1 controlan diversas funciones inmunes importantes en la defensa del hospedero contra las infecciones microbianas. En años recientes estas proteínas han sido involucradas en la generación de una respuesta inmune celular contra Mycobacterium tuberculosis. Aquí, nosotros analizaremos aspectos relevantes acerca de las proteínas CD 1 y las células T específicas para antígenos glicolipídicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The aim of this review is to analyze the current state of our knowledge about cell surface molecules involved in glycolipid antigen presentation, named CD1 family. These proteins constitute a third class of antigen-presenting molecules. CD 1 molecules develop diverse important immune functions in host defenses against microbial infections. In recent years these proteins have been involved in the generation of cell-mediated immune response against Mycobacterium tuberculosis. Here, we analyze relevant roles of CD1 proteins and glycolipid antigen-specific T cells.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[CD1]]></kwd>
<kwd lng="es"><![CDATA[linfocitos T CD8+]]></kwd>
<kwd lng="es"><![CDATA[linfocitos T NK]]></kwd>
<kwd lng="es"><![CDATA[Mycobacterium tuberculosis]]></kwd>
<kwd lng="en"><![CDATA[CD1]]></kwd>
<kwd lng="en"><![CDATA[CD8+ T cells]]></kwd>
<kwd lng="en"><![CDATA[NK T cells]]></kwd>
<kwd lng="en"><![CDATA[Mycobacterium tuberculosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culos de revisi&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>La v&iacute;a de CD1 y la activaci&oacute;n de c&eacute;lulas T NK hacia los ant&iacute;genos glicolip&iacute;dicos de <i>Mycobacterium tuberculosis</i></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>CD1 pathway and NK T Cell activation to glycolipid antigens from<i> Mycobacterium</i></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Isabel Sada&#150;Ovalle,* Luis Torre&#150;Bouscoulet,* Mar&iacute;a del Carmen Jim&eacute;nez&#150;Mart&iacute;nez,* Salvador Mart&iacute;nez&#150;Cairo,** Edgar Zenteno,*** Ricardo Lascurain***</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Bioqu&iacute;mica. Unidad de Investigaci&oacute;n. Instituto Nacional de Enfermedades Respiratorias. Secretar&iacute;a de Salud. M&eacute;xico, D.F.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i>** Coordinaci&oacute;n de Investigaci&oacute;n en Salud. Centro M&eacute;dico Nacional Siglo XXI, IMSS</i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>*** Departamento de Bioqu&iacute;mica, Fac. Medicina, UNAM.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia y solicitud de sobretiros: </b>    <br>     <i>Isabel Sada&#150;Ovalle.     <br>     Departamento de Bioqu&iacute;mica. Unidad de Investigaci&oacute;n. Instituto Nacional de Enfermedades Respiratorias,      Calzada de Tlalpan 4502,     <br>   14080, M&eacute;xico D. F.     <br>   Fax: (55) 56&#150;65&#150;46&#150;23 Tel. (55) 56&#150;65&#150;43&#150;79. </i>    <br> e&#150;mail: <a href="mailto:i_sadamx@yahoo.com.mx">i_sadamx@yahoo.com.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recepci&oacute;n versi&oacute;n modificada: 16 de diciembre de 2004         ]]></body>
<body><![CDATA[<br>   Aceptaci&oacute;n: 08 de enero de 2004</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>El objetivo de esta revisi&oacute;n es analizar el estado actual de nuestro conocimiento sobre las mol&eacute;culas de superficie celular involucradas en la presentaci&oacute;n de ant&iacute;genos glicolip&iacute;dicos, denominadas familia CD1. Estas prote&iacute;nas constituyen la tercera clase de mol&eacute;culas presentadoras de ant&iacute;geno. Las prote&iacute;nas CD 1 controlan diversas funciones inmunes importantes en la defensa del hospedero contra las infecciones microbianas. En a&ntilde;os recientes estas prote&iacute;nas han sido involucradas en la generaci&oacute;n de una respuesta inmune celular contra </i>Mycobacterium tuberculosis. <i>Aqu&iacute;, nosotros analizaremos aspectos relevantes acerca de las prote&iacute;nas CD 1 y las c&eacute;lulas T espec&iacute;ficas para ant&iacute;genos glicolip&iacute;dicos.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b><i>CD1, linfocitos T CD8+, linfocitos T NK, </i>Mycobacterium tuberculosis</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Summary</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>The aim of this review is to analyze the current state of our knowledge about cell surface molecules involved in glycolipid antigen presentation, named CD1 family. These proteins constitute a third class of antigen&#150;presenting molecules. CD 1 molecules develop diverse important immune functions in host defenses against microbial infections. In recent years these proteins have been involved in the generation of cell&#150;mediated immune response against </i>Mycobacterium tuberculosis. <i>Here, we analyze relevant roles of CD1 proteins and glycolipid antigen&#150;specific T cells.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b><i>CD1, CD8+ T cells, NK T cells, </i>Mycobacterium tuberculosis</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">La tuberculosis pulmonar es causada <i>por Mycobacterium tuberculosis </i>(Mtb), un pat&oacute;geno intracelular que infecta a un tercio de la poblaci&oacute;n mundial.<sup>1</sup> La inmunidad mediada por c&eacute;lulas es una respuesta que aporta beneficio al hospedero, sin embargo, los mecanismos a trav&eacute;s de los cuales algunas subpoblaciones de linfocitos T participan en el control de esta enfermedad no han sido claramente establecidos. Informes recientes en la literatura muestran un papel importante de los linfocitos T en la inmunidad celular, en especial aquellos linfocitos T CD8+ que reconocen y matan macr&oacute;fagos alveolares infectados.<sup>2</sup> Los linfocitos T CD8+ reconocen ant&iacute;genos pept&iacute;dicos presentados por mol&eacute;culas cl&aacute;sicas de clase I pertenecientes al sistema HLA (Human Leucocyte Antigen <i>por sus siglas en </i><i>ingl&eacute;s); </i>aunque tambi&eacute;n ha sido descrito que pueden reconocer ant&iacute;genos de naturaleza no proteica como la lipoarabinomanana (LAM) y los man&oacute;sidos de fosfatidilinositol;<sup>3</sup> los ant&iacute;genos derivados de Mtb. Interesantemente estos linfocitos T CD8+ con especificidad por glicol&iacute;pidos micobacterianos pueden lisar macr&oacute;fagos infectados con Mtb, incluso se ha descrito que algunos de sus efectos bactericidas son mediados por granulisina.<sup>3</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Presentaci&oacute;n de ant&iacute;genos proteicos y la familia de mol&eacute;culas CD1</i></font></p>     <p align="justify"><font face="verdana" size="2">Se han descrito dos mecanismos para la presentaci&oacute;n y reconocimiento de ant&iacute;genos proteicos por las dos subpoblaciones principales de linfocitos T; los linfocitos T CD4+ (cooperadores) y los T CD8+ (citot&oacute;xicos). Los linfocitos T CD4+ reconocen ant&iacute;genos extracelulares provenientes de prote&iacute;nas propias o extra&ntilde;as que son fagocitadas y presentadas en la superficie celular, en complejo con mol&eacute;culas de clase II del sistema HLA. Las mol&eacute;culas HLA de clase II son sintetizadas en el ret&iacute;culo endopl&aacute;smico (RE) y transferidas a endosomas, los cuales se fusionan con los fagolisosomas donde se encuentra el ant&iacute;geno proteico. En estos compartimientos, diversos procesos degradan al ant&iacute;geno proteico en peque&ntilde;os p&eacute;ptidos permitiendo su adecuada asociaci&oacute;n con las mol&eacute;culas HLA de clase II.<sup>4&#150;</sup><sup>7</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los linfocitos T CD8+ reconocen tambi&eacute;n ant&iacute;genos proteicos pero de origen end&oacute;geno, como prote&iacute;nas celulares defectuosas, prote&iacute;nas virales, neoant&iacute;genos tumorales, etc. Estas prote&iacute;nas son procesadas en el complejo proteasoma y los productos pept&iacute;dicos son transferidos al RE en donde se unen a mol&eacute;culas HLA de clase I, posteriormente son transportados en endosomas y presentados en la superficie celular.<sup>6,</sup><sup>7</sup> Sin embargo, la acumulaci&oacute;n de evidencia experimental de que los l&iacute;pidos y/o glicol&iacute;pidos (propios o derivados de microorganismos) son reconocidos por algunas subpoblaciones linfocitarias, origin&oacute; las inc&oacute;gnitas sobre la v&iacute;a de procesamiento y c&oacute;mo es que estas subpoblaciones de linfocitos dirigen una respuesta inmune esencial en diversas patolog&iacute;as.</font></p>     <p align="justify"><font face="verdana" size="2">Recientemente, se ha estudiado y descrito una v&iacute;a diferente para el procesamiento y presentaci&oacute;n de l&iacute;pidos y glicol&iacute;pidos de diferentes or&iacute;genes, destacando aquellos ant&iacute;genos derivados de la pared celular de micobacterias entre los que se incluye a: monomicolato de glucosa, &aacute;cidos mic&oacute;licos y lipoarabinomanana (LAM).<sup>8,9</sup> Esta v&iacute;a de procesamiento de ant&iacute;genos glicolip&iacute;dicos, denominada v&iacute;a de CD1, est&aacute; compuesta por un grupo heterog&eacute;neo de mol&eacute;culas que son glicoprote&iacute;nas transmembranales unidas a la &beta;&#150;2 microglobulina ((3&#150;2m) y por prote&iacute;nas adaptadoras heterotetram&eacute;ricas denominadas AP1, AP2, AP3 y AP4.<sup>10 </sup>La familia de prote&iacute;nas CD1, est&aacute; codificada por genes distantes de los pertenecientes al sistema HLA, se localizan en el cromosoma 1 y comprende 5 genes (isotipos) conservados en diferentes especies de mam&iacute;feros y son clasificados en 2 grupos en base a su secuencia hom&oacute;loga.<sup>11,12</sup> El grupo 1 est&aacute; integrado por CD1 a, CD1 b, CD1 c y CD1 e, y el grupo 2 s&oacute;lo incluye a CD1 d, la cual se encuentra en todas las especies estudiadas actualmente (<a href="#f1">Figura 1</a>). Estos dos grupos no se encuentran estrechamente relacionados, lo que sugiere que diferentes isoformas pueden tener diferentes funciones. Las prote&iacute;nas CD1 tienen un tallo citopl&aacute;smico (no ha sido identificado en CD1 a) que contiene la secuencia YXXZ, donde Y es tirosina, X corresponde a cualquier amino&aacute;cido y Z es un grupo heterog&eacute;neo de amino&aacute;cidos hidrof&oacute;bicos.<sup>13</sup>,<sup>14</sup> Esta secuencia en las mol&eacute;culas CD1 facilita su localizaci&oacute;n en los diferentes compartimentos endosomales (<a href="#f2">Figura 2</a>).<sup>15&#150;17</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/gmm/v141n1/a6f1.jpg"></font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/gmm/v141n1/a6f2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Estructura de las prote&iacute;nas CD1</i></font></p>     <p align="justify"><font face="verdana" size="2">Los ant&iacute;genos presentados por CD1 son mol&eacute;culas glicolip&iacute;dicas anfip&aacute;ticas, esto es, consisten de una cabeza hidrof&iacute;lica con grupos polares y una cola hidrof&oacute;bica compuesta por una o dos cadenas hidrocarbonadas.<sup>18</sup> La presentaci&oacute;n de ant&iacute;genos glicolip&iacute;dicos por mol&eacute;culas CD1 a linfocitos T (tambi&eacute;n llamada restricci&oacute;n antig&eacute;nica) muestra semejanzas con el reconocimiento antig&eacute;nico de los complejos p&eacute;ptido/HLA. Las mol&eacute;culas CD1, al igual que las mol&eacute;culas clase I del sistema HLA, son heterod&iacute;meros constituidos por una cadena a asociada a la (&beta;2m, asimismo, estas mol&eacute;culas se sintetizan a nivel del RE.<sup>14 </sup>Las cinco isoformas de CD1 (humano) se asocian de manera no covalente a la &beta;2m aunque con diferentes afinidades; la interacci&oacute;n m&aacute;s fuerte se ha identificado en la mol&eacute;cula CD1 b&#150;&beta;2m, la cual es resistente a la disoluci&oacute;n ocasionada con pH de 3.0.<sup>17</sup> La cadena &alpha; se pliega en tres dominios (&alpha;1 , &alpha;2 y &alpha;3), los cuales son conocidos como cadenas pesadas por su parecido con las cadenas pesadas de las mol&eacute;culas HLA clase I. Los dominios &alpha;1, &alpha;2 y &alpha;3 se extienden hacia el lumen del RE, mientras que una peque&ntilde;a porci&oacute;n de aproximadamente 10 amino&aacute;cidos se orienta a trav&eacute;s de la membrana del RE hacia el citoplasma formando el tallo citopl&aacute;smico.<sup>10</sup> El plegamiento y la asociaci&oacute;n de la mol&eacute;cula CD1 con la &beta;2m m&aacute;s un glicol&iacute;pido end&oacute;geno (habitualmente fosfatidilinositol, residente del RE) es dirigida por las chaperonas conocidas como Calnexina y Calreticulina. El surco de uni&oacute;n para el ant&iacute;geno se constituye por la proximidad de los residuos de amino&aacute;cidos hidrof&oacute;bicos de los dominios &alpha;1 y &alpha;2 formando 4 canales hidrof&oacute;bicos no polares denominados A', F' T' y C'.<sup>19</sup> Sin embargo, estesurco de uni&oacute;n para el ant&iacute;geno en la prote&iacute;na CD1 es m&aacute;s profundo y estrecho que el descrito en las mol&eacute;culas HLA. Este surco de uni&oacute;n antig&eacute;nico est&aacute; compuesto por l&aacute;minas p plegadas en la base y estructuras a h&eacute;lices en los bordes, semejante en su aspecto f&iacute;sico al surco de uni&oacute;n antig&eacute;nico encontrado en las mol&eacute;culas clase I y II del sistema HLA.<sup>20</sup></font></p>     <p align="justify"><font face="verdana" size="2">Se ha propuesto un modelo que predice el anclaje de los glicol&iacute;pidos dentro del surco de uni&oacute;n en las mol&eacute;culas CD1, de modo que los l&iacute;pidos con cadenas alkil cortas ocupan los canales C y A' dejando libres a los T' y F' y la cabeza polar queda localizada fuera de la abertura del surco de uni&oacute;n, en donde interact&uacute;a con el receptor del linfocito T (TCR).<sup>17</sup> An&aacute;lisis realizados en l&iacute;neas celulares humanas CD1b+ portando mutaciones puntuales permitieron conocer que el TCR interacciona con las &alpha;&#150;h&eacute;lices de la mol&eacute;cula CD1 y con el propio ant&iacute;geno glicolip&iacute;dico.<sup>18,</sup><sup>21</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Importancia del CD1 en macr&oacute;fagos infectados por micobacterias</i></font></p>     <p align="justify"><font face="verdana" size="2">Durante la infecci&oacute;n por Mtb, el macr&oacute;fago (<img src="/img/revistas/gmm/v141n1/a6s1.jpg">) es la c&eacute;lula hospedera de la micobacteria, localiz&aacute;ndose especialmente en el compartimiento fagosomal temprano, el cual no es acidificado debido a que la micobacteria inactiva la bomba de protones. Esto retarda el proceso de maduraci&oacute;n fagosomal permitiendo a la micobacteria residir indefinidamente dentro del <img src="/img/revistas/gmm/v141n1/a6s1.jpg">.<sup>22,23</sup> En otras condiciones el material fagocitado por el macr&oacute;fago, es transportado a trav&eacute;s de una serie de eventos de fusi&oacute;n y fisi&oacute;n del fagosoma con la v&iacute;a endosomal/lisosomal en donde este material es degradado.<sup>24,</sup><sup>25</sup> Sin embargo, en el caso de Mtb, observaciones experimentales sugieren que los sulf&aacute;tidos micobacterianos tienen la capacidad de inhibir la fusi&oacute;n fagolisosomal.<sup>22,</sup><sup>23</sup> Por lo tanto, el impedimento en la maduraci&oacute;n del fagosoma es un proceso activo desarrollado por la micobacteria como un mecanismo de evasi&oacute;n de la funci&oacute;n bactericida del <img src="/img/revistas/gmm/v141n1/a6s1.jpg">que correlaciona con la sobrevivencia del bacilo.<sup>26 </sup>Asimismo, la residencia de Mtb en el fagosoma induce en la membrana plasm&aacute;tica de este organelo, la expresi&oacute;n de mol&eacute;culas caracter&iacute;sticas de los endosomas tempranos y tard&iacute;os como transferrina, rab5 y el receptor de transferrina, los cuales son utilizados por la Mtb para la obtenci&oacute;n de nutrimentos del citosol.<sup>27&#150;</sup><sup>30</sup></font></p>     <p align="justify"><font face="verdana" size="2">La envoltura celular de la micobacteria est&aacute; compuesta por dos estructuras principales: una membrana plasm&aacute;tica y una pared celular a su vez constituida por peptidoglicanos y arabinogalactanos unidos por enlaces covalentes.<sup>31 </sup>Interesantemente, algunos glicol&iacute;pidos de la pared celular de la micobacteria son exportados desde el fagosoma inmaduro, moviliz&aacute;ndose en el interior de las c&eacute;lulas infectadas para as&iacute; ser transportados a las c&eacute;lulas vecinas por un proceso de exocitosis. De esta forma, los ant&iacute;genos glicolip&iacute;dicos micobacterianos entran en contacto con las mol&eacute;culas CD1.<sup>32&#150;</sup><sup>34</sup> Algunas de las mol&eacute;culas CD1, principalmente CD1 b han sido localizadas en compartimientos endosomales del complejo multivesicular denominado MIIC <i>(MHC class II peptide&#150;loading compartment </i>por sus siglas en ingl&eacute;s), el cual est&aacute; formado por extensas invaginaciones membranales donde se encuentran mol&eacute;culas clase II del sistema HLA.<sup>35,</sup><sup>36 </sup>Es posible que la asociaci&oacute;n de los ant&iacute;genos glicolip&iacute;dicos micobacterianos con mol&eacute;culas CD1 en los MIIC se realice en un sitio especial para el procesamiento y carga de ant&iacute;genos.<sup>37&#150;</sup><sup>39</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i>Distribuci&oacute;n celular de las mol&eacute;culas CD1</i></font></p>     <p align="justify"><font face="verdana" size="2">Las isoformas de CD1 se localizan diferencialmente en los compartimentos endosomales:</font></p>     <p align="justify"><font face="verdana" size="2">CD1 a. Se expresa en c&eacute;lulas dendr&iacute;ticas derivadas de monocitos as&iacute; como en c&eacute;lulas de Langerhans. La mol&eacute;cula es expresada en la superficie celular, sin embargo, algunos estudios de localizaci&oacute;n intracelular han mostrado que CD1a no se encuentra en los endosomas tard&iacute;os, aunque se ha encontrado en ves&iacute;culas que contienen clatrina, lo cual sugiere que su entrada a los compartimentos intracelulares es mediante clatrina. La distribuci&oacute;n intracelular de CD1 a se debe a que no posee una secuencia basada en tirosina en su tallo citopl&aacute;smico que le permite tener diferentes localizaciones endosomales.<sup>40&#150;</sup><sup>43</sup></font></p>     <p align="justify"><font face="verdana" size="2">CD1b. Las c&eacute;lulas dendr&iacute;ticas derivadas de monocitos son la principal subpoblaci&oacute;n celular que la expresa en la membrana celular. La mol&eacute;cula CD1b despu&eacute;s de ser sintetizada en el ret&iacute;culo endopl&aacute;smico es inicialmente transportada a la membrana celular debido a la uni&oacute;n con las prote&iacute;nas AP2 y AP3 y posteriormente internalizada por un mecanismo dependiente de clatrina, as&iacute; que puede ser encontrada en los endosomas tard&iacute;os y en los MIIC.<sup>14,44&#150;46</sup></font></p>     <p align="justify"><font face="verdana" size="2">CD1c. Es expresada en la membrana de c&eacute;lulas dendr&iacute;ticas y puede ser localizada en compartimentos de la red endosomal junto con receptores de transferrina. Se ha mostrado que la prote&iacute;na CD1 c es capaz de activar a linfocitos T autorreactivos as&iacute; como facilitar la presentaci&oacute;n de fosfol&iacute;pidos micobacterianos a linfocitos T.<sup>47</sup></font></p>     <p align="justify"><font face="verdana" size="2">CD1d. Esta mol&eacute;cula es tambi&eacute;n internalizada por un mecanismo dependiente de clatrina e interact&uacute;a con la prote&iacute;na AP3. Puede localizarse en endosomas tard&iacute;os y en los MIIC, se ha descrito que CD1d puede presentar otra v&iacute;a de tr&aacute;fico intracelular asociada a la cadena Ii en el rat&oacute;n o a la mol&eacute;cula clase II en el humano, a trav&eacute;s de la cual se integra como parte de la red endosomal.<sup>48&#150;</sup><sup>51</sup></font></p>     <p align="justify"><font face="verdana" size="2">CD1e. Ha sido identificada solamente como una prote&iacute;na expresada a nivel intracelular y no ha sido asociada a presentaci&oacute;n o activaci&oacute;n de linfocitos T.<sup>52</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Procesamiento de ant&iacute;genos glicolip&iacute;dicos</i></font></p>     <p align="justify"><font face="verdana" size="2">Las c&eacute;lulas dendr&iacute;ticas que expresan CD1 pueden tambi&eacute;n albergara Mtb, sin embargo, son los <i> </i><img src="/img/revistas/gmm/v141n1/a6s1.jpg"> principal sitio donde esta bacteria reside. Cabe mencionar que los <img src="/img/revistas/gmm/v141n1/a6s1.jpg"> pr&aacute;cticamente no expresan mol&eacute;culas CD1, m&aacute;s a&uacute;n, la expresi&oacute;n de CD1b es regulada negativamente por Mtb.<sup>31,</sup><sup>53,</sup><sup>54</sup> Por lo tanto, la exocitosis de ves&iacute;culas que contienen ant&iacute;genos micobacterianos y su captura por c&eacute;lulas presentadoras de ant&iacute;geno (CPA) vecinas, quiz&aacute; permite la inducci&oacute;n de una respuesta inmune aun cuando la capacidad de las CPA&#150;CD1+ infectadas por Mtb sea ineficiente. La captura de LAM por las CPA para su presentaci&oacute;n a linfocitos T, es un proceso mediado por el receptor de manosa, sin embargo, este receptor no participa en el procesamiento intracelular de los ant&iacute;genos micobacterianos.<sup>35</sup> Se ha sugerido que la captura de los ant&iacute;genos glicolip&iacute;dicos micobacterianos por las CPA&#150;CD1 + y su distribuci&oacute;n en los diferentes compartimientos endosomales mediante un muestreo, es un requisito para hacer m&aacute;s eficiente la presentaci&oacute;n antig&eacute;nica. En muchos de los casos estudiados, la presentaci&oacute;n de ant&iacute;genos glicolip&iacute;dicos por las mol&eacute;culas CD1b humana y CD1d murina es inhibida por substancias como cloroquina y concanamicina A cuya funci&oacute;n es evitar la acidificaci&oacute;n endosomal sugiriendo que hay una asociaci&oacute;n entre los compartimentos &aacute;cidos y el procesamiento de ant&iacute;genos glicolip&iacute;dicos.<sup>14</sup> Esta hip&oacute;tesis se fundamenta en la evidencia de que las mol&eacute;culas CD1 humanas han sido localizadas en diferentes compartimientos de la v&iacute;a endosomal. Un aspecto importante ser&iacute;a conocer cu&aacute;les son las caracter&iacute;sticas moleculares de estos glicol&iacute;pidos que determinan su entrada a la v&iacute;a endosomal.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">A la fecha se sabe que los ant&iacute;genos de origen glicolip&iacute;dico, tanto ex&oacute;genos como end&oacute;genos, pueden ser presentados por mol&eacute;culas CD1.<sup>14,</sup><sup>53</sup> Para el procesamiento de ant&iacute;geno, inicialmente fueron descritos dos mecanismos: uno de ellos postula que los ant&iacute;genos glicolip&iacute;dicos con grandes cadenas alkil (~ 80 carbonos) requieren la ruptura enzim&aacute;tica de enlaces covalentes liberando peque&ntilde;os fragmentos antig&eacute;nicos que pueden ser reconocidos por las c&eacute;lulas T;<sup>18</sup> en el otro mecanismo se propone que el ant&iacute;geno sufre algunas modificaciones estructurales dependientes de pH.<sup>21</sup> Un tercer mecanismo recientemente descrito, sugiere que las cadenas alkil de algunos ant&iacute;genos glicolip&iacute;dicos pueden plegarse dentro del surco de uni&oacute;n en la mol&eacute;cula CD1.<sup>54&#150;</sup><sup>57</sup></font></p>     <p align="justify"><font face="verdana" size="2">Para la presentaci&oacute;n de ant&iacute;genos glicolip&iacute;dicos, los estudios sobre la v&iacute;a de presentaci&oacute;n se han realizado con la mol&eacute;cula CD1 b, la cual reci&eacute;n sintetizada en el RE se asocia a un glicol&iacute;pido end&oacute;geno y entonces viaja a la superficie celular. Posteriormente la mol&eacute;cula CD1 b se internaliza dentro de compartimentos endosomales en donde los l&iacute;pidos end&oacute;genos son removidos y un glicol&iacute;pido ex&oacute;geno es colocado. CD1 es regresada a la superficie celular y ahora potencialmente presentar&aacute; glicol&iacute;pidos extra&ntilde;os (<a href="#f3">Figura 3</a>).<sup>44&#150;47</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f3"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/gmm/v141n1/a6f3.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Reconocimiento de ant&iacute;genos micobacterianos por linfocitos T CD8<sup>+</sup> restringidos a CD1</i></font></p>     <p align="justify"><font face="verdana" size="2">La subpoblaci&oacute;n de linfocitos T que m&aacute;s ha sido estudiada por su asociaci&oacute;n a las mol&eacute;culas CD1 son los linfocitos T tipo NK; fenot&iacute;picamente estos linfocitos pueden ser CD4<sup>+</sup>, CD8<sup>+</sup>, CD4&#150;CD8<sup>&#150;</sup> (dobles negativos) y TCR&gamma;&delta;<sup>+</sup>.<sup>58</sup> La primera descripci&oacute;n que se hizo de los linfocitos T tipo NK fue la de Fowlkes B.J. en 1987, al estudiar timocitos en un modelo murino.<sup>59</sup> Esta poblaci&oacute;n de linfocitos puede ser identificada por la expresi&oacute;n de mol&eacute;culas de superficie celular caracter&iacute;sticas de las c&eacute;lulas NK (NK1.1 y Ly&#150;49 en el rat&oacute;n y CD57 en el humano entre otros), y por su escasa capacidad proliferativa.<sup>60</sup> Otra caracter&iacute;stica importante es su repertorio inmunol&oacute;gico restringido, tambi&eacute;n llamado can&oacute;nico, en donde la mayor&iacute;a de los linfocitos T tipo NK humanos expresan una cadena a que no var&iacute;a (V&alpha;24&#150;J&alpha;Q humana &oacute; V&alpha;14&#150;J&alpha;281 murina).Este TCR reconoce una familia conservada de glicol&iacute;pidos, entre los que se encuentra el glicosilfosfatidilinositol (GPI) el cual puede ser parte de ciertos ant&iacute;genos bacterianos, aunque la naturaleza de estos glicol&iacute;pidos no ha sido claramente establecida.<sup>61</sup> Estudios m&aacute;s recientes sobre esta subpoblaci&oacute;n celular, han establecido que pr&aacute;cticamente todos los linfocitos T tipo NK (humanos y murinos) reconocen la &alpha;&#150;galactosilceramida, un glicol&iacute;pido que fue obtenido de las esponjas marinas durante la b&uacute;squeda de sustancias que pudieran prevenir met&aacute;stasis tumorales.<sup>62&#150;</sup><sup>64</sup> Entre los glicol&iacute;pidos derivados de la pared celular de Mtb, CD1 b presenta &aacute;cidos mic&oacute;licos, monomicolato de glucosa, lipoarabinomanana (LAM) y gangli&oacute;sidos;<sup>54,</sup><sup>57</sup>CD1c presentaf osfoisoprenoides; CD1d presenta glicofosfol&iacute;pidos (man&oacute;sido de fosfatidilinositol) y glicoesfingol&iacute;pidos(gangli&oacute;sidoGM1 y &alpha;&#150;galactosilceramida) y CD1 a presenta algunos sulf&aacute;tidos.<sup>14</sup></font></p>     <p align="justify"><font face="verdana" size="2">La respuesta inmune ante Mtb es dependiente de c&eacute;lulas T y comprende no solamente a los linfocitos T CD4<sup>+</sup> y CD8<sup>+</sup> convencionales, sino que incluye de manera especial a aquellos linfocitos que reconocen glicol&iacute;pidos presentados por CD1.<sup>65&#150;</sup><sup>67</sup> Estos linfocitos T que pueden reconocer glicol&iacute;pidos presentados por mol&eacute;culas CD1, producen citocinas como: IFN&#150;&gamma;, IL&#150;4 y TNF&#150;&alpha;, adem&aacute;s de presentar importante actividad citol&iacute;tica.<sup>68&#150;</sup><sup>70</sup> El IFN&#150;&gamma; muestra un efecto sin&eacute;rgico con el TNF&#150;&alpha; para activar a los MO, lo cual lleva a la muerte de las mico bacterias. La activaci&oacute;n de los linfocitos T tipo NK induce la activaci&oacute;n de c&eacute;lulas del sistema inmune innato como las c&eacute;lulas "natural killer" (NK) y las c&eacute;lulas dendr&iacute;ticas, as&iacute; como la expresi&oacute;n de mol&eacute;culas co&#150;estimuladoras. Por otra parte, esta subpoblaci&oacute;n de linfocitos puede dirigir la inmunidad mediada por c&eacute;lulas contra bacterias intracelulares que requieren la lisis de c&eacute;lulas infectadas as&iacute; como la muerte del pat&oacute;geno.<sup>71</sup> Los linfocitos T tipo NK activados pueden por s&iacute; mismos lisar a sus c&eacute;lulas blanco por tres v&iacute;as principales: primero, citotoxicidad por exocitosis de gr&aacute;nulos que contienen perforina y granzima; segundo, citotoxicidad mediada a trav&eacute;s del sistema Fas/FasL y tercero, actividad microbicida directa, liberando gr&aacute;nulos que contienen granulisina.<sup>72,73</sup> Adem&aacute;s se ha propuesto que esta subpoblaci&oacute;n celular puede contribuir a la inmunidad antimicobacteriana gracias a su capacidad para activar a las c&eacute;lulas NK y la producci&oacute;n de citocinas. En la figura 1 podemos observar un macr&oacute;fago alveolar infectado por Mtb en interacci&oacute;n con un linfocito T CD8<sup>+</sup> tipo NK (que coexpresa la mol&eacute;cula CD57, marcador caracter&iacute;stico de c&eacute;lulas NK). Los linfocitos T CD8<sup>+</sup> tipo NK tienen la capacidad de reconocer ant&iacute;genos lip&iacute;dicos presentados por mol&eacute;culas CD1 y una vez que son activados puede ejercer acciones bactericidas por diferentes mecanismos como citotoxicidad mediada por gr&aacute;nulos (perforina, granzimas y granulisina) o citotoxicidad directa a trav&eacute;s del sistema Fas&#150;FasL (<a href="#f4">Figura 4</a>).</font></p>     <p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/gmm/v141n1/a6f4.jpg"></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>     <p align="justify"><font face="verdana" size="2">La capacidad de Mtb para persistir en los compartimentos endosomales y detener su maduraci&oacute;n en estadios tempranos, es quiz&aacute;, una de las cualidades m&aacute;s relevantes del pat&oacute;geno, porque facilita su supervivencia dentro del M(|). El punto central para la resoluci&oacute;n de la enfermedad es generar una respuesta inmune capaz de activar al mayor n&uacute;mero de macr&oacute;fagos por medio de citocinas, junto con la eficiente actividad citol&iacute;tica de los linfocitos T CD8<sup>+</sup>. Estas acciones son realizadas en conjunto por las principales poblaciones implicadas: linfocitos T CD4<sup>+</sup>, linfocitos TCD8<sup>+</sup>, linfocitos Ty8y las c&eacute;lulas T restringidas a CD1. Aunque Mtb aparentemente reside dentro del fagosoma, se ha propuesto que tiene la capacidad de formar poros en la membrana fagosomal que le permiten tener contacto directo con las mol&eacute;culas clase I y con las prote&iacute;nas CD1. Sin embargo, Mtb tambi&eacute;n es un potente inductor de apoptosis para el M&#094; que lo hospeda, de tal modo que los ant&iacute;genos micobacterianos pueden ser capturados por otros macr&oacute;fagos que ya se encuentren activados y presentados por las c&eacute;lulas CD1+ a los linfocitos T CD8+. El papel de los linfocitos T tipo NK restringidos a CD1 en tuberculosis a&uacute;n no est&aacute; completamente esclarecido, sin embargo, se puede asumir que participan de manera activa en la inmunidad protectora contra Mtb por dos mecanismos principales: el primero es su capacidad para producir citocinas como IFN&#150;y mientras que el segundo es su actividad microbicida directa. A&uacute;n falta por determinar qu&eacute; tan importante puede ser la contribuci&oacute;n de estos linfocitos T CD8<sup>+</sup> tipo NK restringidos a CD1 en la respuesta inmune contra pat&oacute;genos como Mtb, por lo que es necesario realizar futuras investigaciones en este campo.</font></p>     <p align="justify"><font face="verdana" size="2">Agradecimiento: CONACYT 34814&#150;M</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. World Health Organization. The world health report 1999.  Making a difference. Geneva: World Health Organization (1999).</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3832924&pid=S0016-3813200500010000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2">2.<b> Stenger S, Mazzccaro RJ, Uyemura K, Cho S, Barnes PF, Rosat JP, et al. </b>Differential effects of cytolytic cells subsets on intracellular infection. 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