<?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>0028-3746</journal-id>
<journal-title><![CDATA[Neumología y cirugía de tórax]]></journal-title>
<abbrev-journal-title><![CDATA[Neumol. cir. torax]]></abbrev-journal-title>
<issn>0028-3746</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Neumología y Cirugía de Tórax; Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas; Sociedad Cubana de Neumología; Sociedad Paraguaya de Neumología; Sociedad Boliviana de Neumología.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0028-37462015000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Humo de biomasa, inmunidad innata y Mycobacterium tuberculosis]]></article-title>
<article-title xml:lang="en"><![CDATA[Biomass smoke, innate immunity and Mycobacterium tuberculosis]]></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[Ocaña-Guzmán]]></surname>
<given-names><![CDATA[Ranferi]]></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-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Enfermedades Respiratorias Ismael Cosío Villegas  ]]></institution>
<addr-line><![CDATA[Ciudad de México, D.F ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2015</year>
</pub-date>
<volume>74</volume>
<numero>2</numero>
<fpage>118</fpage>
<lpage>126</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0028-37462015000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0028-37462015000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0028-37462015000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Existe evidencia epidemiológica consistente que asocia, de manera independiente, la inhalación crónica de humo de biocombustibles con el desarrollo de tuberculosis pulmonar. Los mecanismos fisiopatológicos que subyacen dicha asociación son parcialmente conocidos. El humo de biocombustibles tiene diversos efectos a nivel del parénquima pulmonar y del sistema inmune innato los cuales, en su conjunto, podrían aumentar la susceptibilidad a diversas infecciones incluyendo Mycobacterium tuberculosis. En esta revisión describimos las características fisicoquímicas más importantes de las partículas presentes en el humo de biocombustibles y la forma en que éstas afectan algunos de los mecanismos inmunológicos que participan en la respuesta inmune contra Mycobacterium tuberculosis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[There is consistent epidemiological evidence linking independently, chronic smoke inhalation biofuel with the development of pulmonary tuberculosis. The pathophysiological mechanisms underlying this association are partially known. Smoke biofuel has different effects in the lung parenchyma and the innate immune system which, taken together, may increase susceptibility to various infections including Mycobacterium tuberculosis. In this review we describe the most important physicochemical characteristics of the particles in the smoke biofuel and how these affect some of the immunological mechanisms involved in the immune response against Mycobacterium tuberculosis.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Biocombustible]]></kwd>
<kwd lng="es"><![CDATA[enfermedad pulmonar]]></kwd>
<kwd lng="es"><![CDATA[tuberculosis]]></kwd>
<kwd lng="en"><![CDATA[Biofuels]]></kwd>
<kwd lng="en"><![CDATA[lung diseases]]></kwd>
<kwd lng="en"><![CDATA[tuberculosis]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">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>Humo de biomasa, inmunidad innata y <i>Mycobacterium tuberculosis</i>&#42; </b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Biomass smoke, innate immunity and <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="2"><b>Isabel Sada-Ovalle,<sup>&Dagger;</sup> Ranferi Oca&ntilde;a-Guzm&aacute;n,<sup>&Dagger;</sup> Luis Torre-Bouscoulet <sup>&Dagger;</sup> </b></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">&#42;Financiamiento: CONACYT 166555;     <br><sup>&Dagger;</sup>Instituto Nacional de Enfermedades Respiratorias Ismael Cos&iacute;o Villegas, Ciudad de M&eacute;xico, D.F.</font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Trabajo recibido: 05-III-2015; aceptado: 25-III-2015</font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN. </b>Existe evidencia epidemiol&oacute;gica consistente que asocia, de manera independiente, la inhalaci&oacute;n cr&oacute;nica de humo de biocombustibles con el desarrollo de tuberculosis pulmonar. Los mecanismos fisiopatol&oacute;gicos que subyacen dicha asociaci&oacute;n son parcialmente conocidos. El humo de biocombustibles tiene diversos efectos a nivel del par&eacute;nquima pulmonar y del sistema inmune innato los cuales, en su conjunto, podr&iacute;an aumentar la susceptibilidad a diversas infecciones incluyendo <i>Mycobacterium tuberculosis</i>. En esta revisi&oacute;n describimos las caracter&iacute;sticas fisicoqu&iacute;micas m&aacute;s importantes de las part&iacute;culas presentes en el humo de biocombustibles y la forma en que &eacute;stas afectan algunos de los mecanismos inmunol&oacute;gicos que participan en la respuesta inmune contra <i>Mycobacterium tuberculosis</i>.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Biocombustible, enfermedad pulmonar, tuberculosis.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ABSTRACT.</b> There is consistent epidemiological evidence linking independently, chronic smoke inhalation biofuel with the development of pulmonary tuberculosis. The pathophysiological mechanisms underlying this association are partially known. Smoke biofuel has different effects in the lung parenchyma and the innate immune system which, taken together, may increase susceptibility to various infections including <i>Mycobacterium tuberculosis</i>. In this review we describe the most important physicochemical characteristics of the particles in the smoke biofuel and how these affect some of the immunological mechanisms involved in the immune response against <i>Mycobacterium tuberculosis</i>.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Biofuels, lung diseases, tuberculosis.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La exposici&oacute;n a part&iacute;culas del humo de biocombustibles (PHBC) y contaminantes ambientales (CA) es causa directa de problemas a la salud. Predisponen a infecciones respiratorias agudas como, enfermedad pulmonar obstructiva cr&oacute;nica (EPOC), asma, c&aacute;ncer y tuberculosis (TB) pulmonar, entre otras.<sup>1,2</sup> Se estima que cerca de 3 mil millones de personas en el mundo utilizan madera y otros compuestos org&aacute;nicos (hojas de &aacute;rboles, papel, materia fecal de animales, restos alimenticios) como fuente de energ&iacute;a para cocinar. En un an&aacute;lisis sistem&aacute;tico realizado por el Global Burden Disease Study se demostr&oacute; que en los a&ntilde;os de 1990 a 2010, la contaminaci&oacute;n intramuros fue responsable de al menos 3.5 millones de muertes y del 4.3% de la suma de a&ntilde;os vividos con discapacidad.<sup>3</sup></font></p>     <p align="justify"><font face="verdana" size="2">Actualmente se considera que la contaminaci&oacute;n intramuros es uno de los 10 factores de riesgo m&aacute;s importantes para desarrollar da&ntilde;os a la salud, especialmente en los pa&iacute;ses en desarrollo.<sup>4</sup> En esos pa&iacute;ses, el uso intradomiciliario de biocombustibles es considerado la principal fuente de contaminaci&oacute;n medioambiental en &aacute;reas rurales y participa a su vez en la contaminaci&oacute;n de &aacute;reas urbanas.<sup>5</sup> Se estima que el 50% de la poblaci&oacute;n mundial a&uacute;n utiliza alg&uacute;n tipo de biocombustible y cerca del 90% de los usuarios viven en un pa&iacute;s en desarrollo; lo anterior es debido principalmente a su f&aacute;cil accesibilidad y bajo costo en comparaci&oacute;n con los combustibles "<i>limpios</i>" que producen un n&uacute;mero menor de part&iacute;culas suspendidas.<sup>6</sup> En pa&iacute;ses como la India, China y Turqu&iacute;a, la combusti&oacute;n de la biomasa (madera, carb&oacute;n, esti&eacute;rcol y residuos agr&iacute;colas) en zonas rurales representa m&aacute;s de un 80% de la energ&iacute;a dom&eacute;stica utilizada.<sup>2,7-9</sup></font></p>     <p align="justify"><font face="verdana" size="2">La quema intramuros de combustibles s&oacute;lidos produce altos niveles de material particulado con un di&aacute;metro a&eacute;reo de 10 &mu;m (PM10) y un rango de concentraci&oacute;n de 300 a 3,000 &mu;g/m<sup>3</sup> y material particulado de 2.5 &mu;m de di&aacute;metro a&eacute;reo (PM2.5) a una concentraci&oacute;n de 256 &mu;g/m<sup>3</sup>/24 horas. Se estima que las mujeres que utilizan combustibles s&oacute;lidos en ambientes cerrados inhalan aproximadamente 25 millones de litros de aire contaminado durante su vida. Se ha documentado que la exposici&oacute;n cr&oacute;nica al humo de la biomasa duplica el riesgo de contraer alguna infecci&oacute;n respiratoria.<sup>10</sup></font></p>     <p align="justify"><font face="verdana" size="2">En M&eacute;xico, seg&uacute;n lo informado por Masera<i> et al</i>., en el a&ntilde;o 2003, en el suroeste y centro del pa&iacute;s existen aproximadamente 262 puntos "<i>calientes</i>" o municipios donde el uso de la le&ntilde;a puede generar un problema de salud respiratoria. &Eacute;stos se concentran en Guerrero, Oaxaca, Tabasco, Quintana Roo y Michoac&aacute;n; estados en los que tambi&eacute;n se concentra la poblaci&oacute;n con mayor &iacute;ndice de pobreza y en los cuales la disposici&oacute;n del biocombustible es asequible.<sup>11</sup> De acuerdo con datos provenientes del Instituto Nacional de Estad&iacute;stica para el censo de poblaci&oacute;n y vivienda del a&ntilde;o 2010, se registr&oacute; una disminuci&oacute;n en el uso de biocombustibles del 21.2 a 14.5% en los &uacute;ltimos 20 a&ntilde;os; 9 de cada 10 usuarios sigue utilizando carb&oacute;n o le&ntilde;a como combustible principal y se concentran en las zonas con menor &iacute;ndice de desarrollo humano.<sup>12</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>CONTAMINACI&Oacute;N INTRAMUROS</b></font></p>     <p align="justify"><font face="verdana" size="2">Nos referimos a contaminaci&oacute;n intramuros a aquella contaminaci&oacute;n que deriva de la quema de biomasa (madera, carb&oacute;n, residuos org&aacute;nicos animales y vegetales) y que es utilizada para cocinar o calentar la vivienda. Las part&iacute;culas suspendidas en el ambiente que son producto de la quema de biomasa var&iacute;an en su composici&oacute;n org&aacute;nica e inorg&aacute;nica, di&aacute;metro y caracter&iacute;sticas de superficie dependiendo de su origen.<sup>13,14</sup> El material particulado (PM) que es producto de la combusti&oacute;n ineficiente de los biocombustibles llevada a cabo a altas temperaturas y en condiciones de deficiencia de ox&iacute;geno (pir&oacute;lisis), produce una enorme variedad de PM que tiene un di&aacute;metro &lt; 10 &mu;m (PM10) y un alto contenido de mon&oacute;xido de carbono (CO), &oacute;xido de nitr&oacute;geno y azufre (NOX y SOX), aldeh&iacute;dos, hidrocarburos arom&aacute;ticos polic&iacute;clicos (HAP), compuestos vol&aacute;tiles org&aacute;nicos (CVO), dioxinas y radicales libres. Las part&iacute;culas del carb&oacute;n primario tienen una microestructura que consiste de diferentes capas planas bidimensionales que rodean un solo n&uacute;cleo; en contraste con las part&iacute;culas provenientes de la quema de otro material como el diesel, las cuales tienen m&aacute;s de un n&uacute;cleo con di&aacute;metros menores. Se ha documentado que esta caracter&iacute;stica f&iacute;sica en la part&iacute;cula de humo de le&ntilde;a podr&iacute;a ser importante, ya que permite adsorber un mayor n&uacute;mero de compuestos org&aacute;nicos como los HAP.<sup>15</sup> Dos de los compuestos m&aacute;s importantes presentes en el humo de la le&ntilde;a son el CO que representa entre 80 y 370 gramos por cada kilogramo de le&ntilde;a en combusti&oacute;n y es responsable del 21.7% de la mortalidad a causa de exposici&oacute;n accidental sufrida por la combusti&oacute;n de le&ntilde;a intramuros;<sup>15,16</sup> y los HAP, que aun cuando representan s&oacute;lo el 1% en la composici&oacute;n qu&iacute;mica del humo de le&ntilde;a,<sup>15</sup> son altamente t&oacute;xicos. La mayor&iacute;a de los HAP est&aacute;n relacionados con procesos mutag&eacute;nicos y de da&ntilde;o al ADN, adem&aacute;s de mostrar una alta capacidad para inducir estr&eacute;s oxidativo.<sup>17</sup> Adicionalmente se pueden identificar compuestos como las dioxinas, los alquil-bencenos y las especies monoarom&aacute;ticas oxigenadas que, en conjunto, representan menos del 10% de la composici&oacute;n total de la part&iacute;cula y se ha descrito que pueden actuar como contaminantes irritantes.<sup>16</sup></font></p>     <p align="justify"><font face="verdana" size="2">Desde el a&ntilde;o 1775 se conoce el efecto carcinog&eacute;nico y t&oacute;xico de los derivados del carb&oacute;n y del petr&oacute;leo. Sir Percivall Pott describi&oacute; una mayor incidencia de c&aacute;ncer de piel de escroto en los deshollinadores, quienes estaban expuestos durante largos per&iacute;odos a los compuestos derivados de la le&ntilde;a y el alquitr&aacute;n; ese hecho fue considerado la primera descripci&oacute;n de un agente cancer&iacute;geno ambiental y la primera referencia de una enfermedad profesional.<sup>18</sup> Sin embargo, fue hasta el a&ntilde;o de 1921 cuando se aisl&oacute; el primer HAP en estado qu&iacute;micamente puro a partir del alquitr&aacute;n. Estudios posteriores con esos compuestos demostraron que los HAP eran responsables del desarrollo de c&aacute;ncer en modelos experimentales <i>in vivo</i> iniciando de esta manera el estudio de los HAP.<sup>19</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los HAP son los compuestos con mayor grado de toxicidad generados durante la combusti&oacute;n de la biomasa en el proceso de pir&oacute;lisis o combusti&oacute;n incompleta de la materia org&aacute;nica. Este proceso es denominado "<i>incompleto</i>" porque durante la combusti&oacute;n hay una deficiencia de ox&iacute;geno impidiendo la adecuada formaci&oacute;n de CO<sub>2</sub> y H<sub>2</sub>O, lo cual favorece que el combustible no reaccione completamente con el ox&iacute;geno provocando la formaci&oacute;n de CO e HAP.<sup>20-22</sup> Existen m&aacute;s de 100 HAP identificados, formados por anillos de carbono que pueden ser saturados o insaturados; sus caracter&iacute;sticas de saturaci&oacute;n, as&iacute; como su configuraci&oacute;n espacial determinan sus caracter&iacute;sticas qu&iacute;micas y biol&oacute;gicas.<sup>23</sup> Los HAP son compuestos altamente lipof&iacute;licos y se encuentran como sustancias complejas vol&aacute;tiles o adsorbidas a las part&iacute;culas de carb&oacute;n.<sup>21,24</sup> Las fuentes de HAP pueden ser naturales (incendios forestales, erupciones volc&aacute;nicas) o antropog&eacute;nicas (combusti&oacute;n de biomasa o tabaco, cocci&oacute;n de alimentos, actividades industriales y emisiones vehiculares).<sup>21</sup> Uno de los HAP m&aacute;s estudiado por sus efectos cancer&iacute;genos e inflamatorios es el Benzo-&alpha;-pireno, el cual es generado tambi&eacute;n a una concentraci&oacute;n elevada en diversos procesos industriales.<sup>25,26</sup> La principal v&iacute;a de ingreso de los HAP al organismo es la inhalaci&oacute;n, seguido de la ingesti&oacute;n de alimentos cocidos a fuego directo y por &uacute;ltimo, la absorci&oacute;n a trav&eacute;s de la piel.<sup>24</sup> Una vez que estos hidrocarburos son absorbidos por el organismo, son distribuidos en zonas con altas concentraciones lip&iacute;dicas como ri&ntilde;ones, h&iacute;gado, cerebro, gl&aacute;ndulas suprarrenales, tejido adiposo, bazo y ovarios.<sup>25</sup> Aunque la mayor&iacute;a de los HAP son eliminados del organismo, existe un proceso de bioconcentraci&oacute;n en los tejidos con alto contenido de l&iacute;pidos.<sup>21</sup> La exposici&oacute;n a HAP ha sido relacionada con diversas enfermedades como c&aacute;ncer, enfermedad pulmonar intersticial, asma y algunos estudios sugieren su participaci&oacute;n en la TB pulmonar.<sup>27-30</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La eliminaci&oacute;n de los HAP a nivel celular es mediada por el citocromo P450, espec&iacute;ficamente por el gen CYP1-A1.<sup>31</sup> CYP1-A1 es un gen inducido a trav&eacute;s de la se&ntilde;alizaci&oacute;n del receptor aril-hidrocarburo (AhR) al unirse a dioxinas o HAP. Una vez activado, este gen codifica para la hidrolasa de aril hidrocarburo (AHH) encargada de la eliminaci&oacute;n de estos compuestos en un proceso involucrado en la generaci&oacute;n de intermediarios reactivos de ep&oacute;xido, relacionados con el desarrollo de c&aacute;ncer.<sup>32-34</sup> El estudio del AhR ha generado resultados importantes pues se ha demostrado que su activaci&oacute;n en el ovario de feto humano inducida por humo de biomateriales como el tabaco, disminuye el tiempo de vida f&eacute;rtil del sujeto al reducir la capacidad proliferativa de las c&eacute;lulas germinales.<sup>35</sup> Otro de los efectos de la interacci&oacute;n del receptor AhR con su ligando es la reducci&oacute;n en la expresi&oacute;n de RNA mensajero y de la prote&iacute;na CCL5, la cual participa como un importante quimio atrayente de eosin&oacute;filos y monocitos circulantes durante el proceso inflamatorio.<sup>36</sup> Por otro lado, la activaci&oacute;n del gen CYP1A1 se ha relacionado ampliamente con un efecto protector ante la exposici&oacute;n a HAP, como se demostr&oacute; en un experimento con ratones deficientes de CYP1A1, los cuales fueron altamente susceptibles a la toxicidad del Benzo-&alpha;-pireno administrado v&iacute;a oral,<sup>37</sup> por lo que una deficiencia o desregulaci&oacute;n en este gen podr&iacute;a incrementar la citotoxicidad celular. Entre los principales efectos inmunol&oacute;gicos de los HAP se ha demostrado que la administraci&oacute;n oral del 7,12-dimetilbenzo (&alpha;) antraceno (DMBA) en un modelo murino induce per&iacute;odos de inmunosupresi&oacute;n persistente aun despu&eacute;s de la eliminaci&oacute;n del HAP.<sup>38</sup> Este efecto se ha observado en diferentes compartimientos linfoides como el bazo, los n&oacute;dulos linf&aacute;ticos y las placas de Peyer.<sup>39</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>RECONOCIMIENTO DE LOS HAP</b></font></p>     <p align="justify"><font face="verdana" size="2">Los estudios bioqu&iacute;micos sobre el receptor de los HAP han demostrado que en ausencia de un agonista, el receptor AhR se encuentra en el &aacute;rea citoplasm&aacute;tica unido a un d&iacute;mero de chaperonas Hsp90 y a dos mol&eacute;culas co-chaperonas ARA9 y p23, las cuales lo mantienen en su forma inactiva.<sup>40</sup> Estructuralmente el receptor AhR es una prote&iacute;na de uni&oacute;n al ADN que cuenta con dominio h&eacute;lice-bucle-h&eacute;lice, adem&aacute;s, de un dominio PAS (Dominio sensor de se&ntilde;al Per-Arnt-Sim) que ante la activaci&oacute;n del receptor por los HAP inicia un cambio conformacional en AhR permitiendo la liberaci&oacute;n de una se&ntilde;al de localizaci&oacute;n nuclear.<sup>41</sup> Se ha descrito que el cambio conformacional en el AhR permite que interact&uacute;e con su translocador nuclear (ARNT), promoviendo la uni&oacute;n espec&iacute;fica a secuencias de anclaje en el ADN como CYP1.<sup>42</sup> Los datos obtenidos sugieren que el receptor es sujeto de regulaci&oacute;n negativa por un mecanismo de exporte nuclear, o por acci&oacute;n del represor del receptor nuclear AHRR; se ha descrito que su degradaci&oacute;n puede darse v&iacute;a proteosoma una vez que es translocado del n&uacute;cleo (<a href="../img/revistas/nct/v74n2/a7f1.jpg" target="_blank">figura 1</a>).<sup>40</sup></font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>EFECTOS INMUNOL&Oacute;GICOS DE LA EXPOSICI&Oacute;N CR&Oacute;NICA A PART&Iacute;CULAS DE HUMO DE LE&Ntilde;A</b></font></p>     <p align="justify"><font face="verdana" size="2">El efecto inmunol&oacute;gico que ejercen las part&iacute;culas de humo de biocombustibles a&uacute;n no se ha caracterizado por completo, ya que su potencial citot&oacute;xico e inflamatorio depende de las caracter&iacute;sticas f&iacute;sicas y qu&iacute;micas de las part&iacute;culas, las cuales var&iacute;an considerablemente dependiendo del tipo de combusti&oacute;n. Las part&iacute;culas que se generan durante la combusti&oacute;n a temperaturas medias producen un mayor efecto citot&oacute;xico, en comparaci&oacute;n con aquellas que son resultado de la pir&oacute;lisis, incrementando as&iacute; la secreci&oacute;n de citocinas proinflamatorias como IL-1&beta;, IL-6, IL-8 y TNF-&alpha; en macr&oacute;fagos. De manera adicional se dice que los bomberos forestales pueden cursar con un mayor reclutamiento de granulocitos a nivel pulmonar posterior a la exposici&oacute;n al humo de le&ntilde;a mayor a 3 horas.<sup>43,44</sup></font></p>     <p align="justify"><font face="verdana" size="2">Existe evidencia de que los HAP presentes en el extracto org&aacute;nico de la part&iacute;cula de humo de biomasa son responsables de la mayor parte de los efectos citot&oacute;xicos en c&eacute;lulas como macr&oacute;fagos alveolares y neumocitos.<sup>45</sup> Aunque no son los &uacute;nicos componentes de la part&iacute;cula que tienen efectos t&oacute;xicos,<sup>43</sup> al exponer monocitos a la fracci&oacute;n org&aacute;nica de humo de le&ntilde;a se ha reportado una disminuci&oacute;n en la capacidad de &eacute;stos para activar a los linfocitos y eliminar al pat&oacute;geno en un cocultivo infectado con <i>Streptococus pneumonie</i>. La actividad fagoc&iacute;tica permanece sin cambio y se presenta a los HAP como los componentes responsables que impiden a los macr&oacute;fagos montar una respuesta eficiente ante las infecciones.<sup>46,47</sup> Existen cambios en la expresi&oacute;n de otros mediadores inflamatorios como IL-6, IL-8 y una mayor activaci&oacute;n de las MAPK.<sup>48</sup> Hasta el momento se han implicado diferentes efectos de las part&iacute;culas de humo de le&ntilde;a sobre la respuesta inmune. El PM puede ser reconocido por los receptores tipo TLR2 y TLR4 mediante el reconocimiento de patrones moleculares asociados a pat&oacute;genos (PAMP) en las part&iacute;culas; estos receptores, una vez activados, producen citocinas proinflamatorias por c&eacute;lulas del epitelio bronquial y macr&oacute;fagos alveolares.<sup>49</sup> Este fen&oacute;meno fue demostrado en macr&oacute;fagos peritoneales <i>knockout</i> para el gen de TLR2/4, los cuales presentaron una disminuci&oacute;n significativa en la producci&oacute;n de TNF-&alpha; e IL-6 al exponerlos a PM.<sup>50</sup> Uno de los factores de transcripci&oacute;n m&aacute;s ampliamente implicado en la secreci&oacute;n de estas citocinas es el NFkB que interact&uacute;a v&iacute;a MyD88 con el TLR4 activado por PM.<sup>51</sup> Otro factor de transcripci&oacute;n relacionado es el factor AP1, activado r&iacute;o arriba por JNK, ERK1/2 y p38 o mediante un incremento en la concentraci&oacute;n de calcio intracelular favoreciendo la fosforilaci&oacute;n y activaci&oacute;n de las MAPK, permitiendo tambi&eacute;n el aumento en la secreci&oacute;n de citocinas proinflamatorias.<sup>17</sup> Otro de los mecanismos toxicol&oacute;gicos importantes es la generaci&oacute;n de especies reactivas de ox&iacute;geno a trav&eacute;s de la activaci&oacute;n del TLR y la v&iacute;a de MyD88-p38 para la activaci&oacute;n de la mol&eacute;cula phox 40 y NADPH.<sup>52</sup> La generaci&oacute;n de especies reactivas de ox&iacute;geno (ROS, por sus siglas en ingl&eacute;s) puede ser causada por las propiedades fisicoqu&iacute;micas de las part&iacute;culas, por el efecto de las part&iacute;culas y sus extractos a nivel de la mitocondria o la activaci&oacute;n de c&eacute;lulas proinflamatorias capaces de generar ROS y especies reactivas de nitr&oacute;geno (RNS, por sus siglas en ingl&eacute;s).<sup>53</sup> Se ha confirmado que un aumento en el calcio intracelular mediado por las endotoxinas presentes en las part&iacute;culas puede activar al factor de transcripci&oacute;n AP1 de manera independiente a ROS<sup>54</sup> y promover tambi&eacute;n la secreci&oacute;n de citocinas proinflamatorias. El efecto proinflamatorio que se observa en el aparato respiratorio se convierte en un fen&oacute;meno sist&eacute;mico, lo cual se traduce en muchos de los casos en enfermedades cardiovasculares.<sup>55</sup> Experimentos realizados en macr&oacute;fagos estimulados con HAP (B-&alpha;-pireno) o part&iacute;culas de diesel y lipopolisac&aacute;rido (LPS) mostraron que la concentraci&oacute;n de los est&iacute;mulos, as&iacute; como el orden en el que interaccionan con la c&eacute;lula puede tener efectos opuestos en la regulaci&oacute;n y expresi&oacute;n de citocinas antiinflamatorias o proinflamatorias como la IL-10 o IL-1&beta;, respectivamente. Estos datos sugieren que la producci&oacute;n de citocinas antiinflamatorias es inducida al exponer a las c&eacute;lulas a part&iacute;culas de diesel o B-&alpha;-pireno previo al est&iacute;mulo con LPS y decrece al invertir el orden de estos est&iacute;mulos.<sup>56</sup> Tambi&eacute;n se ha demostrado que los HAP pueden inducir se&ntilde;ales tanto apopt&oacute;ticas como antiapopt&oacute;ticas en c&eacute;lulas de hepatoma murino, donde se demostr&oacute; que las c&eacute;lulas expuestas a B-&alpha;-pireno activaban y translocaban al n&uacute;cleo en mayor proporci&oacute;n a la mol&eacute;cula p53, la cual induce la expresi&oacute;n de prote&iacute;nas proapopt&oacute;ticas como Bax; del mismo modo, los niveles de la prote&iacute;na antiapopt&oacute;tica fosfo-Bid se vieron incrementados.<sup>57</sup> Por otro lado, la exposici&oacute;n a HAP como el Benzo (&alpha;) pireno ha sido relacionada con una reducci&oacute;n del 60&#126;70% de c&eacute;lulas monoc&iacute;ticas adherentes obtenidas a partir de monocitos de sangre perif&eacute;rica, probablemente por la inducci&oacute;n de apoptosis y la inhibici&oacute;n de la maduraci&oacute;n de los monocitos.<sup>58</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>ASOCIACI&Oacute;N ENTRE TUBERCULOSIS Y EXPOSICI&Oacute;N CR&Oacute;NICA A CONTAMINANTES</b></font></p>     <p align="justify"><font face="verdana" size="2">En M&eacute;xico, en el a&ntilde;o 2010, la tasa de notificaci&oacute;n de TB fue de 17 casos por 100 mil habitantes. La identificaci&oacute;n de factores de riesgo para desarrollar TB podr&iacute;a disminuir la carga econ&oacute;mica que representa &eacute;sta, especialmente en pa&iacute;ses en desarrollo. La inhalaci&oacute;n cr&oacute;nica de humo de tabaco es uno de los factores de riesgo conocidos para desarrollo de TB. El tabaco, al igual que la le&ntilde;a y otros productos procedentes de plantas son biocombustibles, por lo que algunos componentes derivados de su combusti&oacute;n son comunes.</font></p>     <p align="justify"><font face="verdana" size="2">Existe evidencia consistente que asocia la exposici&oacute;n cr&oacute;nica a humo de biocombustibles con el desarrollo de TB pulmonar. Un metaan&aacute;lisis reciente que incluy&oacute; tres estudios llevados a cabo en la India, demostr&oacute; que el OR (odd ratio) de desarrollar TB, dado que se est&aacute; expuesto a humo de biomasa es de 2.33 (IC 95% 1.65-3.28).<sup>59</sup> Resultados semejantes se han demostrado en otros pa&iacute;ses como Nepal en donde el OR fue de 3.45 (IC 95% 1.44-8.27) cuando se utiliz&oacute; keroseno para calentar el hogar.<sup>60</sup> En Turqu&iacute;a, el 26% de los casos de TB pulmonar est&aacute;n asociados a exposici&oacute;n cr&oacute;nica a humo de le&ntilde;a. En M&eacute;xico, P&eacute;rez-Padilla <i>et al</i>. informaron en un estudio de casos y controles, que el uso de biomasa se asocia a tuberculosis con un OR de 2.4 (IC 95% 1.04-5.6).<sup>61</sup> Otras enfermedades asociadas a la exposici&oacute;n cr&oacute;nica de humo de le&ntilde;a son: bronquitis, asma y EPOC, patolog&iacute;as para las que se ha descrito una fuerte asociaci&oacute;n con la exposici&oacute;n al humo de le&ntilde;a.<sup>2,29,62-64</sup></font></p>     <p align="justify"><font face="verdana" size="2"><i>Mycobacterium tuberculosis</i> (<i>M.tb</i>) tiene como principal c&eacute;lula hospedera al macr&oacute;fago alveolar (MA) que es la c&eacute;lula fagoc&iacute;tica de mayor predominio en el pulm&oacute;n, y es componente fundamental de los sistemas inmunol&oacute;gicos innato y adaptativo, as&iacute; como la c&eacute;lula hu&eacute;sped de un gran n&uacute;mero de pat&oacute;genos y contaminantes medioambientales.<sup>65</sup> Al presente contamos con pocos estudios que documenten los efectos t&oacute;xicos inducidos por las PHBC a nivel de macr&oacute;fagos o c&eacute;lulas epiteliales pulmonares y su potencial efecto a nivel de la inmunidad frente a pat&oacute;genos. Durante el desarrollo de la respuesta inmune a <i>M.tb</i> intervienen un grupo de citocinas como el TNF-&alpha;, la interleucina 10 (IL-10) y prote&iacute;nas de la familia Bcl-2 que participan en la modulaci&oacute;n de la muerte celular o apoptosis de los macr&oacute;fagos infectados.<sup>66-68</sup> Se han estudiado diversos factores que pueden conducir al macr&oacute;fago infectado a otros tipos de muerte como la piroptosis mediada por la activaci&oacute;n del inflamosoma.<sup>69</sup> Los PAMP, patrones moleculares asociados a da&ntilde;o celular (DAMP), &aacute;cido &uacute;rico, beta-amiloide, asbesto y s&iacute;lica cristalina son algunos de los est&iacute;mulos que pueden inducir la secreci&oacute;n de estas citocinas y mediar la activaci&oacute;n del inflamosoma-NLAP3.<sup>70,71</sup> La activaci&oacute;n de este complejo proteico lleva a la activaci&oacute;n auto catal&iacute;tica de la prote&iacute;na caspasa-1, la cual media el procesamiento y secreci&oacute;n de IL-1&beta; e IL-18 as&iacute; como la muerte celular por piroptosis.<sup>69</sup> La piroptosis se presenta en c&eacute;lulas mieloides que est&aacute;n infectadas por bacterias como <i>M.tb</i> y que utilizan esta v&iacute;a para escapar de los mecanismos citot&oacute;xicos presentes en los macr&oacute;fagos activados.<sup>71-73</sup> Existe un gran n&uacute;mero de investigaciones realizadas en c&eacute;lulas epiteliales expuestas a PM generado por la combusti&oacute;n de diesel que proponen una disfunci&oacute;n en el proceso de fagocitosis, mismo que puede inhibir la eliminaci&oacute;n bacteriana.<sup>74</sup> Se ha sugerido que procesos como la opsonizaci&oacute;n, migraci&oacute;n y funci&oacute;n tambi&eacute;n se encuentran alterados en c&eacute;lulas polimorfonucleares expuestas a PM, as&iacute; como la activaci&oacute;n de AP1 y el NF-&kappa;B asociados con la producci&oacute;n de citocinas proinflamatorias, incremento en el estr&eacute;s oxidativo y apoptosis celular.<sup>75-77</sup> Los mecanismos antes descritos comparten v&iacute;as de se&ntilde;alizaci&oacute;n intracelular que ayudan a mantener el equilibrio entre apoptosis y necrosis. Pat&oacute;genos como <i>M.tb</i> han desarrollado mecanismos de evasi&oacute;n de la respuesta inmune; uno de los m&aacute;s importantes es la evasi&oacute;n de la muerte celular por apoptosis.<sup>73</sup> Hasta la fecha, no existe evidencia cient&iacute;fica contundente que describa los mecanismos inmunol&oacute;gicos que pueden ser modificados como consecuencia de la exposici&oacute;n de los macr&oacute;fagos a PHBC o a los componentes org&aacute;nicos adsorbidos en la part&iacute;cula, as&iacute; como su implicaci&oacute;n en el desarrollo de TB pulmonar. Es posible que cuando los MA son expuestos a los componentes org&aacute;nicos presentes en el PHBC, se pierda el equilibrio entre los mecanismos que regulan los procesos de apoptosis <i>vs. </i>necrosis. La p&eacute;rdida de dicho balance podr&iacute;a favorecer que exista un mayor crecimiento intracelular de <i>M.tb</i> y ser &eacute;ste uno de los potenciales mecanismos inmunol&oacute;gicos que expliquen la asociaci&oacute;n entre exposici&oacute;n a PHBC y desarrollo de TB pulmonar.</font></p>     <p align="justify"><font face="verdana" size="2">Las v&iacute;as inmunol&oacute;gicas afectadas por las PM10 presentes en el humo de biocombustibles llevan al desarrollo de un estado proinflamatorio sist&eacute;mico y disfunci&oacute;n de varios mecanismos inmunol&oacute;gicos. Falta explorar el efecto de aquellas part&iacute;culas menores a 2 &mu;m que tienen la capacidad de difundir al sistema circulatorio y mediar da&ntilde;o en otros &oacute;rganos y sistemas.</font></p>     <p align="justify"><font face="verdana" size="2"></font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">  <b>Conclusi&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La contaminaci&oacute;n intramuros por humo de biomasa es un problema global de salud p&uacute;blica. En la actualidad se reconoce a la exposici&oacute;n al humo de biomasa como un factor de riesgo independiente para desarrollar TB. Dicha susceptibilidad para desarrollar TB se debe a la disfunci&oacute;n inmunol&oacute;gica inducida por el humo de biocombustibles. El riesgo a la salud respiratoria, en especial el riesgo de desarrollar TB pulmonar por exposici&oacute;n al humo de biomasa, es un s&oacute;lido argumento para fortalecer el derecho de todo ser humano a respirar aire limpio. La implementaci&oacute;n de estufas mejoradas podr&iacute;a ser una estrategia de salud p&uacute;blica que ayudar&iacute;a a mejorar la salud respiratoria de miles de personas en todo el mundo.</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.	Kocbach B&oslash;lling A, Pagels J, Yttri KE, et al. Health effects of residential wood smoke particles: the importance of combustion conditions and physicochemical particle properties. 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<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">76.	Taylor AE, Finney-Hayward TK, Quint JK, et al. Defective macrophage phagocytosis of bacteria in COPD. Eur Respir J 2010;35(5):1039-1047. doi:10.1183/09031936.00036709.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5397301&pid=S0028-3746201500020000700076&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">77.	Dagher Z, Gar&ccedil;on G, Billet S, et al. Role of nuclear factor-kappa B activation in the adverse effects induced by air pollution particulate matter (PM2.5) in human epithelial lung cells (L132) in culture. J Appl Toxicol 2007;27(3):284-290.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=5397303&pid=S0028-3746201500020000700077&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia:</b>     <br> Dr. Luis Torre-Bouscoulet     <br> Subdirector de Investigaci&oacute;n Cl&iacute;nica.      <br> Instituto Nacional de Enfermedades Respiratorias Ismael Cos&iacute;o Villegas, Calzada de Tlalpan      <br> N&uacute;m. 4502, Colonia Secci&oacute;n XVI, 14080, M&eacute;xico, D.F. Tel&eacute;fono: 54871700 Ext. 5360     <br> Correo electr&oacute;nico: <a href="mailto:luistorreb@gmail.com" target="_blank">luistorreb@gmail.com</a>     ]]></body>
<body><![CDATA[<br>      <br> </font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    <p align="justify"><font face="verdana" size="2">      <br> <b>Notas</b>     <br>      <br> <i>Los autores declaran no tener conflicto de intereses.</i>     <br>      <br> </font></p>    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">      <br>      <br> Este art&iacute;culo puede ser consultado en versi&oacute;n completa en: <a href="http://www.medigraphic.com/neumologia" target="_blank">http://<b>www.medigraphic.com/neumologia</b></a></font></p>       ]]></body><back>
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