<?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>0185-3325</journal-id>
<journal-title><![CDATA[Salud mental]]></journal-title>
<abbrev-journal-title><![CDATA[Salud Ment]]></abbrev-journal-title>
<issn>0185-3325</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-33252008000100005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Vías de neuroinmunomodulación: Segunda parte]]></article-title>
<article-title xml:lang="en"><![CDATA[Neuroimmunomodulation pathways: Part two]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[María Eugenia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Becerril]]></surname>
<given-names><![CDATA[Luis Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarez]]></surname>
<given-names><![CDATA[Lizeth]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pavón-Romero]]></surname>
<given-names><![CDATA[Lenin]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma Metropolitana Ciencias Biológicas y de la Salud ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Psiquiatría Ramón de la Fuente Dirección de Investigaciones en Neurociencias Laboratorio de Psicoinmunología]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2008</year>
</pub-date>
<volume>31</volume>
<numero>1</numero>
<fpage>29</fpage>
<lpage>36</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-33252008000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-33252008000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-33252008000100005&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culo original</font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>V&iacute;as de neuroinmunomodulaci&oacute;n. Segunda parte<a href="#nota">*</a></b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Neuroimmunomodulation pathways. Part two</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Mar&iacute;a Eugenia Hern&aacute;ndez,<sup>1,2</sup> Luis Enrique Becerril,<sup>1</sup> Lizeth Alvarez,<sup>1</sup> Lenin Pav&oacute;n&#150;Romero<sup>1</sup></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1 </sup>Laboratorio de Psicoinmunolog&iacute;a, Direcci&oacute;n de investigaciones en Neurociencia del Instituto Nacional de Psiquiatr&iacute;a Ram&oacute;n de la Fuente.</i></font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>2 </sup>Ciencias Biol&oacute;gicas y de la Salud. Universidad Aut&oacute;noma Metropolitana.</i></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><sup>*</sup>Correspondencia:</b>    <br>   Lenin Pav&oacute;n&#150;Romero.    <br>   Laboratorio de Psicoinmunolog&iacute;a,    <br>   Direcci&oacute;n de Investigaciones en Neurociencias    <br>   del Instituto Nacional de Psiquiatr&iacute;a Ram&oacute;n de la Fuente.    <br>   Calzada M&eacute;xico&#150;Xochimilco 101,    <br>   San Lorenzo Huipulco,    <br>   Tlalpan, 14370    <br>   M&eacute;xico D.F.    ]]></body>
<body><![CDATA[<br>   Correo electr&oacute;nico: <a href="mailto:lkuriaki@imp.edu.mx">kuriaki@imp.edu.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>V&Iacute;A COLIN&Eacute;RGICA ANTI&#150;INFLAMATORIA</b></font></p>     <p align="justify"><font face="verdana" size="2">Los componentes simp&aacute;tico y parasimp&aacute;tico del sistema nervioso aut&oacute;nomo raramente operan de forma aislada; la respuesta aut&oacute;noma representa la interconexi&oacute;n de ambas partes. La interacci&oacute;n entre el sistema nervioso aut&oacute;nomo y la respuesta inmunol&oacute;gica fue sugerida desde hace m&aacute;s de 20 a&ntilde;os, cuando se detect&oacute; que la estimulaci&oacute;n colin&eacute;rgica muscar&iacute;nica generaba un incremento en la poblaci&oacute;n de los linfocitos T citot&oacute;xicos (Strom y cols., 1972). A pesar de esta observaci&oacute;n la acci&oacute;n inmunomodulatoria de la funci&oacute;n de las eferencias vagales y parasimp&aacute;ticas a&uacute;n no se comprende del todo (Antonica y cols., 1994; Hori y cols., 1995; Niijima y cols., 1995).</font></p>     <p align="justify"><font face="verdana" size="2">Recientemente se ha demostrado la existencia de una ruta parasimp&aacute;tica de modulaci&oacute;n de la respuesta inflamatoria local y sist&eacute;mica que se enfoca en la acci&oacute;n neuroinmunomodulatoria del nervio vago (Borovikova y cols., 2000b; Borovikova y cols., 2000a).</font></p>     <p align="justify"><font face="verdana" size="2"><b>Evidencias del control ejercido por el nervio vago sobre la respuesta inflamatoria local y sist&eacute;mica</b></font></p>     <p align="justify"><font face="verdana" size="2">La acetilcolina es un importante neurotransmisor y neuroinmunomodulador en el cerebro. Adem&aacute;s de mediar la transmisi&oacute;n neural en la sinapsis ganglionar de ambos sistemas &#150;simp&aacute;tico y parasimp&aacute;tico&#150;, es el principal neurotransmisor en las neuronas eferentes posganglionares parasimp&aacute;ticas y vagales. La acetilcolina act&uacute;a a trav&eacute;s de dos tipos de receptores: muscar&iacute;nicos (metabotr&oacute;picos) (Caulfield y Birdsall, 1998) y nicot&iacute;nico (ionotr&oacute;picos) (Lindstrom, 1997).</font></p>     <p align="justify"><font face="verdana" size="2">Adem&aacute;s del tejido cerebral y otras estructuras ampliamente inervadas, hay otras c&eacute;lulas perif&eacute;ricas que expresan el mensaje gen&eacute;tico de los receptores muscar&iacute;nicos y nicot&iacute;nicos, como los linfocitos y las c&eacute;lulas productoras de citocinas, muchas de las cuales tambi&eacute;n producen acetilcolina (Hiemke y cols., 1996; Mita y cols., 1996; Sato y cols., 1999; Tayebati y cols., 2002; Toyabe y cols., 1997; Walach y cols., 2001). Reportes recientes sugieren que la subunidad &#945; 7 del receptor nicot&iacute;nico de la acetilcolina se expresa en macr&oacute;fagos (Borovikova y cols., 2000b).</font></p>     <p align="justify"><font face="verdana" size="2">La acetilcolina disminuye significativamente en forma dosis dependiente la producci&oacute;n de TNF&#150;&#945; en cultivos de macr&oacute;fagos estimulados por endotoxinas por medio de mecanismos postranscripcionales. Usando agonista y antagonistas muscar&iacute;nicos y nicot&iacute;nicos espec&iacute;ficos, se ha demostrado la importancia del receptor nicot&iacute;nico sensible a la &#945;&#150;bungarotoxina en la inhibici&oacute;n de la s&iacute;ntesis del TNF&#150;&#945; <i>in vitro </i>por la acetilcolina.</font></p>     <p align="justify"><font face="verdana" size="2">La acetilcolina tambi&eacute;n es efectiva en la supresi&oacute;n de la s&iacute;ntesis de otras citocinas proinflamatorias, como la IL&#150;1&#946; e IL&#150;6, a trav&eacute;s de mecanismos postranscripcionales, aunque las citocinas antiinflamatorias como la IL&#150;10, secretada por macr&oacute;fagos estimulados con endotoxinas, no se ven afectadas (Borovikova y cols., 2000b).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En cuanto a los efectos <i>in vivo </i>de la acetilcolina, se ha reportado que roedores con vagotom&iacute;a sin estimulaci&oacute;n el&eacute;ctrica muestran un incremento de los niveles circulatorios y hep&aacute;ticos de la TNF&#150;&#945; en repuesta a la administraci&oacute;n intravenosa de endotoxina (Pavlov y cols., 2003), lo que sugiere una funci&oacute;n directa de las neuronas eferentes vagales en la regulaci&oacute;n de esta citocina <i>in vivo</i>, ya que la estimulaci&oacute;n el&eacute;ctrica de las eferencias vagales en este modelo disminuye la secreci&oacute;n de TNF&#150;&#945;. El TNF&#150;&#945; amplifica el fen&oacute;meno inflamatorio al inducir la secreci&oacute;n de mediadores proinflamatorios como la IL&#150;1&#946;, HMGB1 y especies reactivas del ox&iacute;geno (Koj, 1996; Wang y cols., 1999b).</font></p>     <p align="justify"><font face="verdana" size="2">En los casos de choque inducido por endotoxinas, el TNF&#150;&#945; inhibe la frecuencia cardiaca, activa la trombosis a nivel microvascular y modula el s&iacute;ndrome de extravasaci&oacute;n vascular (Tracey y cols., 1986; Tracey y cols., 1987). Estas actividades del TNF&#150;&#945; son consistentes con los hallazgos de la atenuaci&oacute;n de los niveles s&eacute;ricos del TNF&#150;&#945; a trav&eacute;s de la estimulaci&oacute;n v&iacute;a cervical del nervio vago, que previene la hipotensi&oacute;n y el choque s&eacute;ptico en animales expuestos a dosis letales de endotoxinas (Borovikova y cols., 2000b).</font></p>     <p align="justify"><font face="verdana" size="2">Los animales a los que se ha practicado una vagotom&iacute;a y que no reciben estimulaci&oacute;n del nervio vago desarrollan choques s&eacute;pticos m&aacute;s profundos y r&aacute;pidos comparados con animales &lt;&lt;de maniobra simulada&gt;&gt; (<i>sham</i>) para la vagotom&iacute;a, lo que sugiere la funci&oacute;n del nervio vago en la se&ntilde;alizaci&oacute;n eferente para mantener la homeostasis.</font></p>     <p align="justify"><font face="verdana" size="2">En cuanto a los efectos inmunomodulatorios de las eferencias del nervio vago, la estimulaci&oacute;n el&eacute;ctrica del nervio vago distal inhibe la respuesta inflamatoria local, como en el caso de la inflamaci&oacute;n del cojinete plantar de roedores inducido por la administraci&oacute;n de carragenina (Borovikova y cols., 2000a). El pretratamiento con acetilcolina, nicotina o agentes muscar&iacute;nicos en el sitio de la inflamaci&oacute;n tambi&eacute;n previene el desarrollo de inflamaci&oacute;n en el cojinete plantar (Borovikova y cols., 2000a).</font></p>     <p align="justify"><font face="verdana" size="2">Las eferencias vagales se distribuyen a trav&eacute;s del sistema ret&iacute;culo endotelial y otros &oacute;rganos perif&eacute;ricos, por lo que la respuesta motora del cerebro, derivada de las eferencias vagales, es r&aacute;pida. De lo anterior se desprende que la ruta colin&eacute;rgica antiinflamatoria puede ser el sitio donde se modula la inflamaci&oacute;n en tiempo real.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Activaci&oacute;n farmacol&oacute;gica de la v&iacute;a colin&eacute;rgica antiinflamatoria</b></font></p>     <p align="justify"><font face="verdana" size="2">Es posible activar la ruta colin&eacute;rgica antiinflamatoria con agentes farmacol&oacute;gicos de acci&oacute;n central, ya que la gunilhidrazona tetravalente o CNI&#150;1493 induce estimulaci&oacute;n al nervio vago (Borovikova y cols., 2000a) e induce efectos antiinflamatorios a trav&eacute;s de la activaci&oacute;n de la ruta colin&eacute;rgica antiinflamatoria en modelos de inflamaci&oacute;n local y sist&eacute;mica (Bernik y cols., 20002; Borovikova y cols., 2000a).</font></p>     <p align="justify"><font face="verdana" size="2">El efecto antiinflamatorio del CNI&#150;1493 se ha investigado en modelos experimentales de c&aacute;ncer, pancreatitis, artritis reumatoide, choque por endotoxinas y sepsis (Martiney y cols., 1998). El CNI&#150;1493 se desarroll&oacute; originalmente como un inhibidor de la activaci&oacute;n de macr&oacute;fagos, porque previene la fosforilaci&oacute;n del mit&oacute;geno p38, que es un activador de las prote&iacute;nas cinasas (Bianchi y cols., 1996; Tracey y cols., 1998; Wang y cols., 1998) . En modelos de isquemia cerebral, el CNI&#150;1493 administrado por v&iacute;a intracerebro&#150;ventricular (ICV) disminuye la s&iacute;ntesis del TNF&#150;&#945; cerebral y reduce el volumen de infarto (Meistrell ME y cols., 1997). Es necesario se&ntilde;alar que la administraci&oacute;n del CNI&#150;1493 por v&iacute;a ICV tambi&eacute;n disminuye la producci&oacute;n sist&eacute;mica del TNF&#150;&#945; en un reto perif&eacute;rico con endotoxina. Otros reportes han descrito que el CNI&#150;1493 estimula las eferencias del nervio vago (Borovikova y cols., 2000a), lo que sugiere que la v&iacute;a colin&eacute;rgica antiinflamatoria puede mediar la actividad antiinflamatoria de este compuesto.</font></p>     <p align="justify"><font face="verdana" size="2">Los efectos antiinflamatorios del CNI&#150;1493 requieren la participaci&oacute;n del nervio vago, sin importar la v&iacute;a de administraci&oacute;n del f&aacute;rmaco (ICV o IV), ya que la vagotom&iacute;a cervical bilateral elimina el efecto. Esto sugiere que el CNI&#150;1493 Participa en la protecci&oacute;n contra la inflamaci&oacute;n local y sist&eacute;mica y el choque s&eacute;ptico a trav&eacute;s de la v&iacute;a colin&eacute;rgica antiinflamatoria.</font></p>     <p align="justify"><font face="verdana" size="2">La activaci&oacute;n de la ruta colin&eacute;rgica antiinflamatoria por compuestos de acci&oacute;n central, como el CNI&#150;1493, puede tener efectos cl&iacute;nicos para el tratamiento de la sepsis y otras enfermedades mediadas por citocinas.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Es posible que existan dos v&iacute;as potenciales por medio de las cuales el CNI&#150;1493 active la se&ntilde;alizaci&oacute;n del nervio vago eferente. Por cualquiera de ellas puede acceder al DMN y activar directamente las se&ntilde;ales de las eferencias vagales o bien activar otras neuronas dentro del DVC u otras estructuras cerebrales m&aacute;s altas que indirectamente activen las eferencias del nervio vago. En el DVC se ha identificado una serie de receptores que act&uacute;an como el sitio de las terminaciones primarias de las fibras nerviosas del vago. Dentro del DMN, por ejemplo, existen receptores muscar&iacute;nicos, pero &eacute;stos no se asocian con neuronas eferentes vagales (Hoover y cols., 1985; Hyde y cols., 1998). Los sitios de uni&oacute;n para los receptores muscar&iacute;nicos (especialmente los del subtipo M<sub>2</sub>) y nicot&iacute;nicos se han detectado en la parte caudal y media del NTS (Lawrence y Jarrot, 1996).</font></p>     <p align="justify"><font face="verdana" size="2">El sistema colin&eacute;rgico en el NTS ha sido identificado con base en la presencia de acetilcolina transferasa, acetilcolina esterasa y acetilcolina (Hoover y cols., 1985; Shihara y cols., 1999). Este sistema colin&eacute;rgico participa en la regulaci&oacute;n del gasto cardiovascular y la modulaci&oacute;n del reflejo baroreceptor, el cual est&aacute; mediado de forma central por el glutamato. La presencia del receptor del glutamato est&aacute; bien documentada dentro del DVC (Hornby, 2001; Mascarucci y cols., 1998; Sykes y cols., 1997).</font></p>     <p align="justify"><font face="verdana" size="2">Las aferencias vagales (cardiovascular y de las v&iacute;sceras abdominales) que terminan en el NTS son predominantemente glutamat&eacute;rgicas, las que hacen sinapsis sobre las neuronas del NTS a trav&eacute;s de los receptores del NMDA y no&#150;NMDA (Hornby, 2001; Macarucci y cols., 1998).</font></p>     <p align="justify"><font face="verdana" size="2">La exposici&oacute;n a la IL&#150;1 o a la endotoxina puede activar el sistema vagal glutamat&eacute;rgico en el NTS. Ambos tipos de receptores del glutamato transmiten impulsos del AP hacia el NTS (Mira y cols., 2000). Los receptores del glutamato del NMDA tambi&eacute;n est&aacute;n presentes sobre el AP y las neuronas del DMN.</font></p>     <p align="justify"><font face="verdana" size="2">Las neuronas motoras pregangli&oacute;nicas vagales localizadas en el DMN extienden sus dendritas hasta el NTS. Los receptores nicot&iacute;nicos (especialmente el subtipo &#945;7), neurop&eacute;ptido Y, GABA (A y B), neurocina&#150;1 y neurocina&#150;3 han sido localizados en las neuronas eferentes del vago en el DMN (Blondeau y cols., 2002; Browning y Travagli, 2001; Ferreira y cols., 2001; Lewis y Travagli, 2001. Los purinorreceptores ionotr&oacute;picos P2X dependientes de ATP (que act&uacute;an como receptores) est&aacute;n presentes en las neuronas del DMN y AP (Visconti y cols., 2000).</font></p>     <p align="justify"><font face="verdana" size="2">Es posible que algunos de estos receptores representen componentes esenciales de los mecanismos de las rutas de activaci&oacute;n farmacol&oacute;gica de la ruta colin&eacute;rgica antiinflamatoria.</font></p>     <p align="justify"><font face="verdana" size="2"><b>La subunidad &#945;7 del receptor nicot&iacute;nico de acetilcolina como componente esencial de la v&iacute;a colin&eacute;rgica antiinflamatoria</b></font></p>     <p align="justify"><font face="verdana" size="2">La inhibici&oacute;n de la s&iacute;ntesis del TNF&#150;&#945; perif&eacute;rico, por mecanismos que involucran la participaci&oacute;n de las eferencias del nervio vago, implica la comunicaci&oacute;n de estas eferencias con c&eacute;lulas como los macr&oacute;fagos, que expresan la subunidad &#945;7 del receptor nicot&iacute;nico de la acetilcolina, y media la actividad antiinflamatoria del nervio vago.</font></p>     <p align="justify"><font face="verdana" size="2">El receptor nicot&iacute;nico de la acetilcolina pertenece a una familia de ligandos que controla canales i&oacute;nicos pentam&eacute;ricos. La principal funci&oacute;n de esta familia de receptores es trasmitir la se&ntilde;al de la acetilcolina hacia las uniones neuromusculares desde el sistema nervioso central y perif&eacute;rico (Leonard y Bertrand, 2001; Lindstrom, 1997; Marubio y Changeux, 2000; Steinlein, 1998).</font></p>     <p align="justify"><font face="verdana" size="2">En los humanos se han identificado 16 subtipos de receptores nicot&iacute;nicos de acetilcolina: &#945;1&#150;7, &#945;9&#150;10, &#946;1&#150;4, &#948;, &#949; y &#947; (Leonard y Bertrand, 2001; Lindstrom, 1997). Estas subunidades tienen el potencial para formar un gran n&uacute;mero de receptores homo y heteropentam&eacute;rico que poseen distintas propiedades y funciones. Entre las 16 subunidades, s&oacute;lo las subunidades &#945;1, &#945;7 y &#945;9 enlazan un antagonista derivado del veneno de serpiente, la &#945;&#150;bungarotoxina. Los macr&oacute;fagos pueden unir espec&iacute;ficamente a la &#945;&#150;bungarotoxina, y su uni&oacute;n puede competir con la nicotina, lo que sugiere que los macr&oacute;fagos expresan funcionalmente las subunidades a1, &#945;7 y/o &#945;9 de los receptores nicot&iacute;nicos de acetilcolina.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">An&aacute;lisis del material gen&eacute;tico de macr&oacute;fagos por RT&#150;PCR mostraron la expresi&oacute;n del mensaje gen&eacute;tico de las subunidades &#945;1, &#945;7 y a10 pero no de &#945;9, aunque an&aacute;lisis posteriores efectuados por Western&#150;Blot mostraron que los macr&oacute;fagos humanos diferenciados expresan de forma espec&iacute;fica la subunidad &#945;7 (Wang y cols., 2003).</font></p>     <p align="justify"><font face="verdana" size="2">La relevancia funcional de la subunidad &#945;7 del receptor nicot&iacute;nico de macr&oacute;fagos en la ruta colin&eacute;rgica antiinflamatoria se evalu&oacute; usando oligonucle&oacute;tidos antisentido para la subunidad &#945;7. La inhibici&oacute;n de la expresi&oacute;n de la subunidad &#945;7 restaura la respuesta del TNF&#150;&#945; inducido por endotoxina en presencia de nicotina, en tanto que, en condiciones similares, los oligonucle&oacute;tidos de las subunidades &#945;1 y a10 no logran disminuir la secreci&oacute;n de TNF&#150;&#945; en presencia de nicotina (Wang y cols., 2003).</font></p>     <p align="justify"><font face="verdana" size="2">Los ratones deficientes para la unidad &#945;7, utilizados para definir las funciones <i>in vivo </i>de esta mol&eacute;cula, no presentan problemas de desarrollo ni defectos anat&oacute;micos (Orr&#150;Urtreger y cols., 1997). Cabe se&ntilde;alar que lo anterior ocurre no obstante que estos animales son m&aacute;s sensibles a los est&iacute;mulos inflamatorios, ya que liberan significativamente m&aacute;s TNF&#150;&#945;, IL&#150;1 e IL&#150;6 ante endotoxemias comparados con cepas silvestres (Wang y cols., 2003).</font></p>     <p align="justify"><font face="verdana" size="2">La estimulaci&oacute;n el&eacute;ctrica del nervio vago disminuye los niveles de citocinas proinflamatorias en suero y tejidos en las cepas silvestres; sin embargo, en ratones deficientes para la subunidad &#945;7 este fen&oacute;menono se presenta (Wang y cols., 2003).</font></p>     <p align="justify"><font face="verdana" size="2">Los macr&oacute;fagos peritoneales aislados de ratones deficientes para la subunidad &#945;7 no responden a la acetilcolina ni a la nicotina y contin&uacute;an produciendo TNF&#150;&#945; en presencia de agonistas colin&eacute;rgicos. El receptor nicot&iacute;nico para la subunidad &#945;7 se ha detectado en la cervical superior y el ganglio pancre&aacute;tico, aunque su papel funcional en la transmisi&oacute;n ganglionar a&uacute;n no ha sido demostrado <i>in vivo</i>.</font></p>     <p align="justify"><font face="verdana" size="2">El receptor nicot&iacute;nico para la subunidad &#945;3 media la transmisi&oacute;n sin&aacute;ptica r&aacute;pida del ganglio aut&oacute;nomo. Esta observaci&oacute;n sugiere que la alta sensibilidad a los procesos inflamatorios mostrada por los ratones deficientes para la subunidad &#945;7 no se puede atribuir a un da&ntilde;o en la transmisi&oacute;n ganglionar simp&aacute;tica o parasimp&aacute;tica.</font></p>     <p align="justify"><font face="verdana" size="2">La integraci&oacute;n de estos datos indica que la subunidad &#945;7 del receptor nicot&iacute;nico de la acetilcolina es un componente indispensable de la ruta colin&eacute;rgica antiinflamatoria, por lo que &eacute;sta representa una funci&oacute;n altamente espec&iacute;fica del nervio vago eferente, ya que &eacute;ste puede actuar sobre los macr&oacute;fagos a trav&eacute;s de la subunidad &#945;7 del receptor nicot&iacute;nico en lugar de los &lt;&lt;cl&aacute;sicos&gt;&gt; receptores muscar&iacute;nicos de la acetilcolina.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Integraci&oacute;n de la v&iacute;a colin&eacute;rgica antiinflamatoria con la inmunomodulacion derivada del cerebro</b></font></p>     <p align="justify"><font face="verdana" size="2">La participaci&oacute;n de las neuronas eferentes del vago en la neuroinmunomodulaci&oacute;n est&aacute; apoyada por la funci&oacute;n protectora de la ruta colin&eacute;rgica antiinflamatoria en la inflamaci&oacute;n local y sist&eacute;mica.</font></p>     <p align="justify"><font face="verdana" size="2">La respuesta colin&eacute;rgica antiinflamatoria se activa al parecer por las se&ntilde;ales provenientes del eje HHA y el SNC (Pav&oacute;n y cols., 2004). Las citocinas proinflamatorias liberadas ante un est&iacute;mulo antig&eacute;nico pueden activar la se&ntilde;alizaci&oacute;n de aferencias vagales y, de manera subsiguiente, ya sea directa o indirectamente (a trav&eacute;s de neuronas NTS), activar eferencias vagales en el DMN. As&iacute;, las aferencias vagales sensoriales, junto con las eferencias regulatorias del vago, forman un &lt;&lt;reflejo inflamatorio&gt;&gt; que continuamente monitorea los niveles de los mediadores de la inflamaci&oacute;n en la periferia (Tracey, 2002). La v&iacute;a colin&eacute;rgica antiinflamatoria tambi&eacute;n puede ser activada por la se&ntilde;alizaci&oacute;n mediada por citocinas v&iacute;a el AP. De este modo, en conjunto con las fibras eferentes colin&eacute;rgicas, la ruta colin&eacute;rgica antiinflamatoria puede estar constituida por al menos dos estructuras del tallo cerebral: el NTS y el DMN. Estos pueden ser estimulados por las citocinas proinflamatorias a trav&eacute;s de los mecanismos neuronales (aferencias del vago) o humorales (AP).</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La administraci&oacute;n intravenosa de la IL&#150;1&#946; induce la activaci&oacute;n de las fibras eferentes del vago que inervan el timo (Niijima y cols., 1995). Un hecho es que la administraci&oacute;n de endotoxinas induce la activaci&oacute;n neuronal en el DMN, as&iacute; como del NTS y el AP (Hermann y cols., 2001). La ausencia de esta vigilancia neuronal provoca un aumento de la inflamaci&oacute;n, como sucede en los ratones vagotomizados con endotoxemia (Borovikova y cols., 2000b). Este reflejo antiinflamatorio integrado centralmente es similar a los mecanismos del reflejo vago&#150;vagal que controla el tracto gastrointestinal. Estas observaciones sugieren que la ruta colin&eacute;rgica antiinflamatoria se activa durante la respuesta inflamatoria.</font></p>     <p align="justify"><font face="verdana" size="2">El NTS puede integrar la ruta colin&eacute;rgica con otra respuesta inmunomodulatoria central, ya que el NTS puede trasmitir la se&ntilde;al al nervio vago aferente y a dos &aacute;reas del cerebro involucradas en la neuroinmunomodulaci&oacute;n. Un ejemplo de esto es el circuito neuronal bidireccional que se establece entre el NTS y el PVN hipotal&aacute;mico que puede activar al eje HHA, lo que genera una inmunoregulaci&oacute;n negativa a trav&eacute;s de los glucocorticoides.</font></p>     <p align="justify"><font face="verdana" size="2">Las neuronas del NTS tambi&eacute;n se proyectan hacia estructuras como el RVM y el LC, las cuales pueden activar al SNS y modular la respuesta inmunol&oacute;gica. Las estructuras clave en la modulaci&oacute;n neuroinmunol&oacute;gica son, en primer lugar, el NTS, el cual se asocia a la recepci&oacute;n y posterior transmisi&oacute;n de la se&ntilde;al de citocinas a la ruta colin&eacute;rgica antiinflamatoria, el SNS y el eje HHA; en segundo t&eacute;rmino, el PVN hipotal&aacute;mico, el cual es responsable de la conversi&oacute;n de la se&ntilde;al neuronal a hormonal y por &uacute;ltimo, las gl&aacute;ndulas adrenales, que liberan adrenalina de las c&eacute;lulas cromafines por la activaci&oacute;n del SNS y completan la principal ruta de liberaci&oacute;n de glucocorticoides.</font></p>     <p align="justify"><font face="verdana" size="2">Ambas divisiones del sistema nervioso aut&oacute;nomo son activadas por est&iacute;mulos inmunol&oacute;gicos, como las citocinas, y contribuyen a la modulaci&oacute;n de la inflamaci&oacute;n. El SNS regula negativamente la respuesta inflamatoria por medio de los &#946;&#150;adrenoceptores. En algunos casos, sin embargo, la noradrenalina puede incrementar la liberaci&oacute;n del TNF&#150;&#945;, probablemente a trav&eacute;s de los &#945;&#150;adrenoceptores (Zhou y cols., 2001).</font></p>     <p align="justify"><font face="verdana" size="2">La activaci&oacute;n de la ruta colin&eacute;rgica antiinflamatoria puede contrarrestar la excesiva liberaci&oacute;n de TNF&#150;&#945;. Esta ruta y el SNS tambi&eacute;n act&uacute;an de forma sin&eacute;rgica para controlar la respuesta inflamatoria. El SNS puede inducir inmunoregulaci&oacute;n negativa a trav&eacute;s de los &#946;&#150;adrenoceptores, por la regulaci&oacute;n negativa de la producci&oacute;n de citocinas mediada por el nervio vago, a trav&eacute;s de receptores nicot&iacute;nicos de acetilcolina que contienen la subunidad &#945;7. En contraste con los mecanismos de mediaci&oacute;n hormonal, la regulaci&oacute;n neural de la respuesta inmunol&oacute;gica es r&aacute;pida y precisa, por lo que puede ser una importante respuesta temprana para la inflamaci&oacute;n perif&eacute;rica.</font></p>     <p align="justify"><font face="verdana" size="2">Las inervaciones simp&aacute;ticas y vagales del timo, h&iacute;gado, coraz&oacute;n, pulmones, tracto gastrointestinal, p&aacute;ncreas y ri&ntilde;ones pueden proporcionar la base anat&oacute;mica para la coregulaci&oacute;n de los macr&oacute;fagos tisulares, c&eacute;lulas dendr&iacute;ticas, c&eacute;lulas cebadas, c&eacute;lulas de Kupffer y otras c&eacute;lulas productoras de citocinas en los tejidos involucrados o no en la respuesta inmunol&oacute;gica.</font></p>     <p align="justify"><font face="verdana" size="2">El h&iacute;gado es un importante &oacute;rgano en la fase aguda de la respuesta inflamatoria, ya que proporciona los componentes necesarios para la defensa del hu&eacute;sped en el sitio de la inflamaci&oacute;n y coordina la activaci&oacute;n de las prote&iacute;nas plasm&aacute;ticas de la fase aguda (Baumann y Gauldie, 1994). Se ha propuesto que las c&eacute;lulas de Kupffer son la principal fuente de citocinas en la endotoxemia (Chensue y cols., 1991). En consecuencia, la estimulaci&oacute;n de las neuronas eferentes vagales pueden modular la respuesta inflamatoria generada en el h&iacute;gado.</font></p>     <p align="justify"><font face="verdana" size="2">El coraz&oacute;n es inervado por las dos divisiones del sistema nervioso aut&oacute;nomo; la disfunci&oacute;n del sistema nervioso aut&oacute;nomo (tono simp&aacute;tico alto, tono parasimp&aacute;tico bajo) que ocurre despu&eacute;s de un infarto al miocardio, es un buen predictor de mortalidad (Honzikova y cols.). En el coraz&oacute;n, los macr&oacute;fagos residentes y miocitos cardiacos son la principal fuente del TNF&#150;&#945;; se han detectado receptores para el TNF&#150;&#945; en los miocitos del coraz&oacute;n (Meldrum, 1998; Torre&#150;Amione y cols., 1995). La secreci&oacute;n de TNF&#150;&#945; de ambas poblaciones, macr&oacute;fagos y miocitos del miocardio, contribuye a la disfunci&oacute;n del miocardio y a la muerte de los cardiomiocitos en la sepsis, deficiencia cardiaca cr&oacute;nica, da&ntilde;o isqu&eacute;mico por reperfusi&oacute;n, miocarditis viral y rechazo al transplante cardiaco (Meldrum, 1998). La efectividad de la estimulaci&oacute;n del nervio vago en la inhibici&oacute;n del TNF&#150;&#945; cardiaco (Bernik y cols., 2002) garantiza futuras investigaciones de la funci&oacute;n inmunomodulatoria de la ruta colin&eacute;rgica antiinflamatoria en el coraz&oacute;n y otros &oacute;rganos.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Implicaciones terap&eacute;uticas de la v&iacute;a colin&eacute;rgica antiinflamatoria</b></font></p>     <p align="justify"><font face="verdana" size="2">Hay m&uacute;ltiples aproximaciones terap&eacute;uticas para el manejo de la respuesta inflamatoria, enfocadas principalmente a la supresi&oacute;n de las citocinas proinflamatorias o de las acciones mediadas por citocinas.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La identificaci&oacute;n de la ruta colin&eacute;rgica antiinflamatoria sugiere nuevas aproximaciones terap&eacute;uticas para modular la acci&oacute;n de las citocinas y la respuesta inflamatoria. Ejemplo de ello es que la estimulaci&oacute;n del nervio vago representa una aproximaci&oacute;n novedosa para inhibir la producci&oacute;n del TNF&#150;&#945; y proteger contra complicaciones patol&oacute;gicas inducidas por la respuesta inflamatoria.</font></p>     <p align="justify"><font face="verdana" size="2">Se han aprobado implantes permanentes que estimulan el nervio vago como herramientas terap&eacute;uticas para tratar de la depresi&oacute;n y la epilepsia (George y cols., 2000a; George y cols., 2000b; Valencia y cols., 2001).</font></p>     <p align="justify"><font face="verdana" size="2">La estimulaci&oacute;n del nervio vago previene ataques por la estimulaci&oacute;n sensorial aferente asociada con la funci&oacute;n l&iacute;mbica y cortical. Aunque las eferencias vagales tambi&eacute;n se pueden activar como resultado de la estimulaci&oacute;n del nervio vago, no se han detectado complicaciones cardiacas, g&aacute;stricas o pulmonares (Hanforth y cols., 1998).</font></p>     <p align="justify"><font face="verdana" size="2">La estimulaci&oacute;n del nervio vago en animales causa activaci&oacute;n neuronal en el NTS, LC, DMN y n&uacute;cleos hipotal&aacute;micos entre los que se encuentra el PVN (Krahl y cols., 1998; Naritoku y cols., 1995). La estimulaci&oacute;n del nervio vago incrementa la actividad de los componentes clave de la respuesta antiinflamatoria derivada del cerebro. Adem&aacute;s de las eferencias vagales, el eje HHA y el SNS se pueden activar como efecto colateral de la estimulaci&oacute;n del nervio vago. La ocurrencia de esta activaci&oacute;n a&uacute;n se debe evaluar por medio de las fluctuaciones en los niveles de glucorticoides en circulaci&oacute;n en pacientes con estimuladores del nervio vago.</font></p>     <p align="justify"><font face="verdana" size="2">El descubrimiento de la ruta colin&eacute;rgica antiinflamatoria identifica al menos un receptor tipo que puede ser un blanco farmacol&oacute;gico para modular la actividad de las citocinas. La subunidad &#945;7 del receptor nicot&iacute;nico de acetilcolina es esencial para regular la respuesta inflamatoria perif&eacute;rica. La activaci&oacute;n de este receptor v&iacute;a la estimulaci&oacute;n del nervio vago (Wang y cols., 2003) o agonistas colin&eacute;rgicos (Wang y cols., 2007) suprime la secreci&oacute;n de citocinas y protege contra la endotoxemia letal murina y la sepsis.</font></p>     <p align="justify"><font face="verdana" size="2">El CNI&#150;1493 fue el instrumento farmacol&oacute;gico necesario para el descubrimiento y la caracterizaci&oacute;n de la ruta colin&eacute;rgica antiinflamatoria, que ejerce su efecto antiinflamatorio <i>in vivo </i>por medio de un mecanismo central involucrado en la activaci&oacute;n del nervio vago (Bernik y cols., 2002; Borovikova y cols., 2000a). Es posible que otros f&aacute;rmacos experimentales o ya aceptados cl&iacute;nicamente funcionen por medio de un mecanismo no anticipado de activaci&oacute;n de rutas neuronales. Por ejemplo, dosis bajas de &#945;&#150;MSH administradas centralmente o salicilatos inducen espec&iacute;ficamente una respuesta antiinflamatoria perif&eacute;rica. Igualmente, la amiodarona &#150;un f&aacute;rmaco antiarr&iacute;tmico cardiaco&#150;, la aspirina, la indometaciona y el ibuprofeno incrementan sustancialmente la actividad del nervio vago. La identificaci&oacute;n precisa de los receptores cerebrales que median estos efectos facilitar&aacute; el desarrollo de f&aacute;rmacos agonistas que puedan activar la ruta colin&eacute;rgica antiinflamatoria.</font></p>     <p align="justify"><font face="verdana" size="2">A la luz de la ruta colin&eacute;rgica antiinflamatoria, es importante reconsiderar que las aproximaciones terap&eacute;uticas alternativas, como la hipnosis, la meditaci&oacute;n, la oraci&oacute;n, el bio&#150;feedback, la acupuntura e incluso el condicionamiento pavloviano de la respuesta inmunol&oacute;gica, pueden involucrar mecanismos centrales que modulen las respuestas inflamatorias sist&eacute;micas o perif&eacute;ricas experimentales. Asimismo, se debe considerar que la disfunci&oacute;n auton&oacute;mica se presenta no s&oacute;lo en presencia de enfermedades letales o sepsis, ya que se presenta en complicaciones de la diabetes, la artritis reumatoide y otros padecimientos autoinmunes.</font></p>     <p align="justify"><font face="verdana" size="2">Si el aumento fisiol&oacute;gico de la actividad del nervio vago a trav&eacute;s de cualquiera de estos m&eacute;todos puede modular el curso de la enfermedad, ser&aacute; dilucidado por medio de la investigaci&oacute;n cl&iacute;nica en los a&ntilde;os por venir.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>AGRADECIMIENTOS</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Este trabajo fue apoyado por los Proyectos 2078 y 2318 del Instituto Nacional de Psiquiatr&iacute;a Ram&oacute;n de la Fuente, as&iacute; como por el proyecto CONACYT&#150;SALUD 2003&#150;CO1&#150;14.</font></p>     <p align="justify"><font face="verdana" size="2">Agradecemos al doctor Alejandro Carrasco por su apoyo en el dise&ntilde;o y la elaboraci&oacute;n de los diagramas.</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. Adcock IM, Ito K. Molecular mechanisms of corticosteroid actions. 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<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b><a name="nota"></a>NOTA</b></font></p>     <p align="justify"><font face="verdana" size="2"><sup>*</sup> En la primera parte, Vol. 30, No. 6, noviembre&#150;diciembre 2007 aparecieron los res&uacute;menes en ingl&eacute;s y espa&ntilde;ol.</font></p>      ]]></body><back>
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