<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932014000100005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Exposición a aflatoxina: un problema de salud pública]]></article-title>
<article-title xml:lang="es"><![CDATA[Exposition to aflatoxin: A public health problem]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carreño Venegas]]></surname>
<given-names><![CDATA[Andrea]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hurtado Guerra]]></surname>
<given-names><![CDATA[Juan José]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Navas Navas]]></surname>
<given-names><![CDATA[María Cristina]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2014</year>
</pub-date>
<volume>27</volume>
<numero>1</numero>
<fpage>42</fpage>
<lpage>52</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932014000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932014000100005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932014000100005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La aflatoxina, una micotoxina producida por hongos contaminantes, es un potente tóxico hepático y un agente carcinógeno. La exposición a ella en la dieta es de particular importancia en ciertas regiones del Sureste de Asia y de África subsahariana, cuyas poblaciones presentan alta frecuencia de carcinoma hepatocelular y de la mutación en el codón 249 del gen p53; además, tienen alta prevalencia de la infección por el virus de la hepatitis B. Este factor de riesgo es muy importante si se tiene en cuenta que se ha demostrado sinergia entre la infección por dicho virus y la exposición a aflatoxina en la patogénesis del carcinoma hepatocelular. Pocos estudios han explorado la exposición a aflatoxinas en la dieta de la población latinoamericana y se desconoce el papel en ella de esta micotoxina como factor de riesgo para dicho carcinoma. En este artículo se presenta una revisión sobre diversos aspectos de las aflatoxinas, con énfasis en su relación con la infección por el virus de la hepatitis B y con el carcinoma hepatocelular.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Aflatoxin, a mycotoxin produced by pollutant molds, is a potent hepatotoxic and carcinogenic agent. Dietary exposition to it is of particular importance in certain regions of Southeast Asia and sub-Saharan Africa. Populations in these regions suffer from high incidence of hepatocellular carcinoma, and have high frequency of the mutation in the codon 249 of p53 gene; besides, prevalence of Hepatitis B virus (HBV) infection is high in those populations. Synergism between infection with HBV and the exposition to this mycotoxin in the pathogenesis of hepatocellular carcinoma has been demonstrated. Few studies have explored the exposition to aflatoxin in the diet of populations in Latin America, and the role in them of this mycotoxin as a risk factor for hepatocellular carcinoma is unknown. In this article different aspects of aflatoxin are reviewed with emphasis on its relationship with HBV infection and with such neoplasia.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Aflatoxina B1]]></kwd>
<kwd lng="es"><![CDATA[Carcinoma Hepatocelular]]></kwd>
<kwd lng="es"><![CDATA[Dieta]]></kwd>
<kwd lng="es"><![CDATA[Factores de Riesgo]]></kwd>
<kwd lng="es"><![CDATA[Neoplasias Hepáticas]]></kwd>
<kwd lng="en"><![CDATA[Aflatoxin B1]]></kwd>
<kwd lng="en"><![CDATA[Diet]]></kwd>
<kwd lng="en"><![CDATA[Hepatocellular Carcinoma]]></kwd>
<kwd lng="en"><![CDATA[Liver Neoplasms]]></kwd>
<kwd lng="en"><![CDATA[Risk Factors]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="4" face="Verdana, Arial, Helvetica, sans-serif"> <b>Exposici&oacute;n a aflatoxina:   un problema de salud p&uacute;blica</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b> Exposition to aflatoxin: A public health problem</b>   </font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Andrea Carre&ntilde;o Venegas<sup>1</sup>; Juan Jos&eacute; Hurtado Guerra<sup>1</sup>; Mar&iacute;a Cristina Navas Navas<sup>1</sup></b></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 1 Grupo de Gastrohepatolog&iacute;a, Facultad de Medicina, Universidad de Antioquia, Medell&iacute;n, Colombia.<a href="mailto:mcnavasn@gmail.com"> mcnavasn@gmail.com</a> </font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recibido: diciembre 29 de 2012    <br>   Aceptado: julio 02 de 2013    </font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La aflatoxina, una micotoxina producida por hongos contaminantes, es un potente t&oacute;xico   hep&aacute;tico y un agente carcin&oacute;geno. La exposici&oacute;n a ella en la dieta es de particular importancia   en ciertas regiones del Sureste de Asia y de &Aacute;frica subsahariana, cuyas poblaciones   presentan alta frecuencia de carcinoma hepatocelular y de la mutaci&oacute;n en el cod&oacute;n 249 del   gen p53; adem&aacute;s, tienen alta prevalencia de la infecci&oacute;n por el virus de la hepatitis B. Este   factor de riesgo es muy importante si se tiene en cuenta que se ha demostrado sinergia entre   la infecci&oacute;n por dicho virus y la exposici&oacute;n a aflatoxina en la patog&eacute;nesis del carcinoma hepatocelular.   Pocos estudios han explorado la exposici&oacute;n a aflatoxinas en la dieta de la poblaci&oacute;n   latinoamericana y se desconoce el papel en ella de esta micotoxina como factor de riesgo   para dicho carcinoma. En este art&iacute;culo se presenta una revisi&oacute;n sobre diversos aspectos de las   aflatoxinas, con &eacute;nfasis en su relaci&oacute;n con la infecci&oacute;n por el virus de la hepatitis B y con el   carcinoma hepatocelular.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>PALABRAS CLAVE</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <i>Aflatoxina B1, Carcinoma Hepatocelular, Dieta, Factores de Riesgo, Neoplasias Hep&aacute;ticas</i>   </font></p> <hr noshade size="1">     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Aflatoxin, a mycotoxin produced by pollutant molds, is a potent hepatotoxic and carcinogenic   agent. Dietary exposition to it is of particular importance in certain regions of Southeast Asia   and sub-Saharan Africa. Populations in these regions suffer from high incidence of hepatocellular   carcinoma, and have high frequency of the mutation in the codon 249 of p53 gene;   besides, prevalence of Hepatitis B virus &#40;HBV&#41; infection is high in those populations. Synergism   between infection with HBV and the exposition to this mycotoxin in the pathogenesis of   hepatocellular carcinoma has been demonstrated. Few studies have explored the exposition   to aflatoxin in the diet of populations in Latin America, and the role in them of this mycotoxin   as a risk factor for hepatocellular carcinoma is unknown. In this article different aspects of aflatoxin are reviewed with emphasis on its relationship   with HBV infection and with such neoplasia.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>KEY WORDS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  <i> Aflatoxin B1, Diet, Hepatocellular Carcinoma, Liver   Neoplasms, Risk Factors</i></font></p> <hr noshade size="1">     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODUCCI&Oacute;N</b>   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Numerosos problemas de salud p&uacute;blica que afectan   tanto al hombre como a los animales est&aacute;n relacionados   directa o indirectamente con la agricultura;   entre ellos se cuenta la acci&oacute;n de agentes qu&iacute;micos,   f&iacute;sicos o biol&oacute;gicos que interfieren con la adecuada   producci&oacute;n, procesamiento y/o distribuci&oacute;n de alimentos.   Algunos de estos agentes han sido considerados   como factores de riesgo para el desarrollo de   enfermedades de gran impacto mundial, entre ellos   las micotoxinas &#40;1&#41;. Estas son sustancias qu&iacute;micas   naturales, producto del metabolismo de algunos hongos   que colonizan cultivos y alimentos almacenados;   se ha calculado que afectan a m&aacute;s del 25&#37; de los cultivos   en el mundo cada a&ntilde;o &#40;2&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La exposici&oacute;n aguda a aflatoxinas en la dieta, llamada   aflatoxicosis aguda, puede causar necrosis hep&aacute;tica,   hemorragia, falla hep&aacute;tica aguda y edema &#40;3&#41;. En   cuanto a la exposici&oacute;n cr&oacute;nica en la dieta a niveles   bajos se ha asociado con trastornos en la digesti&oacute;n, la   absorci&oacute;n y/o el metabolismo de los nutrientes, con   cirrosis y con el desarrollo de carcinoma hepatocelular   &#40;HCC, por su sigla en ingl&eacute;s&#41;, el m&aacute;s importante   c&aacute;ncer primario de h&iacute;gado &#40;CPH&#41; &#40;1,4,5&#41;. Estudios   epidemiol&oacute;gicos han permitido establecer que la asociaci&oacute;n   entre la exposici&oacute;n a aflatoxinas y el desarrollo   de HCC es un fen&oacute;meno com&uacute;n en poblaciones de   pa&iacute;ses con ingresos bajos o medianos, en particular   en &Aacute;frica y Asia.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Aunque los primeros casos de micotoxicosis se describieron   en la Edad Media, solo en 1850 se demostr&oacute; la   asociaci&oacute;n de esta enfermedad, conocida como ergotismo,   con el consumo de cereales, especialmente de   centeno &#40;5&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se acu&ntilde;&oacute; el t&eacute;rmino aflatoxina tras un episodio de   intoxicaci&oacute;n fatal de m&aacute;s de 100.000 pavos, por consumo   de torta de man&iacute; contaminada con metabolitos   secundarios producidos por el hongo <i>Aspergillus flavus</i> &#40;6-8&#41;, a los que se les dio el nombre de aflatoxinas;   las diferentes aflatoxinas se denominaron con base en   su fluorescencia &#40;de azul a verde&#41; y su movilidad en   cromatoplacas de s&iacute;lica gel normal. Las cuatro aflatoxinas   producidas por hongos son la B1, B2, G1 y G2 &#40;5,9,10&#41;.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> A comienzos de los a&ntilde;os 60, la aflatoxina B1 &#40;AFB1&#41;   fue considerada un potente carcin&oacute;geno en algunas   especies de animales; este hallazgo fue ratificado en   1993 por la Agencia Internacional para la Investigaci&oacute;n   en C&aacute;ncer &#40;10&#41;. Diversos estudios han permitido demostrar   una tendencia end&eacute;mica de la exposici&oacute;n en   regiones con caracter&iacute;sticas particulares como condiciones   ambientales &oacute;ptimas para el crecimiento del   hongo, m&eacute;todos y condiciones inadecuadas de   almacenamiento de los alimentos y falta de prevenci&oacute;n   y protecci&oacute;n de las poblaciones expuestas. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Se han publicado trabajos de diversa &iacute;ndole acerca de   este asunto, a saber: sobre aspectos bioqu&iacute;micos y biol&oacute;gicos   de las aflatoxinas; sobre las especies de mohos productores   y estudios epidemiol&oacute;gicos y experimentales   que demuestran la asociaci&oacute;n entre la toxina y el HCC.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>AFLATOXINAS EN LA NATURALEZA</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Las aflatoxinas son una familia de sustancias producidas   por los hongos <i>Aspergillus flavus, A. parisiticus y A.   nomius</i> &#40;3,11&#41;. Estos hongos son ubicuos, abundantes   en climas c&aacute;lidos y h&uacute;medos y considerados saprofitos   en casi todos los sustratos &#40;8&#41;. Adem&aacute;s, se ha   encontrado que ciertas especies de <i>Penicillium</i> son   tambi&eacute;n productoras de aflatoxinas &#40;12&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Las aflatoxinas son productos del metabolismo del   hongo &#40;13&#41;, generados por la v&iacute;a biosint&eacute;tica de   poliqu&eacute;tidos en condiciones sub&oacute;ptimas de crecimiento   y de estr&eacute;s. En general, las micotoxinas act&uacute;an como   antibi&oacute;ticos, favoreciendo la persistencia del hongo   en determinados sustratos &#40;14&#41;. Se ha descrito una   mayor producci&oacute;n de micotoxinas en presencia de   factores que disminuyen la inmunidad de las plantas   hospederas, como da&ntilde;o por insectos, mala fertilizaci&oacute;n   y sequ&iacute;a, entre otros. Adem&aacute;s, las condiciones   de transporte, almacenamiento y procesamiento del   alimento, en particular la humedad, la temperatura,   el tiempo de almacenamiento y el grado de invasi&oacute;n   f&uacute;ngica antes del mismo y la actividad de insectos y   &aacute;caros &#40;3&#41; son variables que favorecen el crecimiento   y reproducci&oacute;n de los mohos.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Las especies del g&eacute;nero <i>Aspergillus</i> se caracterizan   por presentar facultades adaptativas que facilitan su   subsistencia, puesto que requieren una humedad   relativa ambiental de 70&#37; a 90&#37; y un contenido de   agua en el sustrato de 15&#37; a 20&#37;; adem&aacute;s, pueden crecer   en un rango amplio de temperatura &#40;0 a 45 &#176;C&#41; y a   baja concentraci&oacute;n de ox&iacute;geno &#40;12&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La contaminaci&oacute;n por aflatoxinas es una causa importante   de grandes p&eacute;rdidas econ&oacute;micas en la agricultura   mundial: anualmente se afectan alrededor de 16   millones de toneladas de ma&iacute;z, 12 millones de toneladas   de arroz, 1,8 millones de toneladas de nueces   y 2,3 millones de toneladas de soya, entre otros cultivos.   Recientemente se han implementado estrategias   de control biol&oacute;gico para prevenir la contaminaci&oacute;n,   mediante la utilizaci&oacute;n de cepas de <i>A. flavus</i> no productoras   de aflatoxinas, para que compitan con las   cepas tox&iacute;genas &#40;15&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En a&ntilde;os recientes se han llevado a cabo en Latinoam&eacute;rica   algunos estudios para determinar los niveles   de aflatoxinas en alimentos producidos en Brasil,   Argentina, Colombia, Venezuela y Uruguay; estos pa&iacute;ses   son los principales exportadores de granos en la   regi&oacute;n &#40;16&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En Colombia, en particular en Medell&iacute;n, se ha demostrado   contaminaci&oacute;n con aflatoxina en muestras   de ma&iacute;z, con niveles por encima del m&aacute;ximo   establecido por la Administraci&oacute;n de Drogas y Alimentos   de los Estados Unidos &#40;FDA, por su sigla en   ingl&eacute;s&#41; y la Organizaci&oacute;n de Alimentos y Agricultura   de las Naciones Unidas &#40;FAO, por su sigla en ingl&eacute;s&#41;;   estos hallazgos fueron confirmados en estudios   posteriores &#40;17&#41;.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En 2001 D&iacute;az y colaboradores evaluaron un total de   248 muestras, obtenidas en supermercados, tiendas   minoristas y centros de acopio. Se detect&oacute; aflatoxina   en 22 de ellas, incluyendo 14/109 &#40;12,8&#37;&#41; muestras   de ma&iacute;z y 4/40 &#40;10&#37;&#41; muestras de arroz. Doce de las   22 muestras positivas excedieron el nivel m&aacute;ximo   tolerado de AFB1 adoptado por la mayor&iacute;a de los   pa&iacute;ses &#40;5 ng/g&#41;. Dado que el ma&iacute;z es uno de los principales   cultivos del pa&iacute;s &#40;614.509 hect&aacute;reas sembradas   en 2004&#41; y hace parte de la dieta b&aacute;sica de los   colombianos, es probable que su contaminaci&oacute;n   con AFB1 pueda ser un factor de riesgo para la   poblaci&oacute;n &#40;18&#41;. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>BIOACTIVACI&Oacute;N Y DETOXIFICACI&Oacute;N DE LA AFB1</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La citotoxicidad y genotoxicidad de la AFB1 est&aacute;n   estrechamente relacionadas con los procesos metab&oacute;licos   de bioactivaci&oacute;n y detoxificaci&oacute;n de esta micotoxina   en el h&iacute;gado. En la bioactivaci&oacute;n act&uacute;an primordialmente   enzimas de la superfamilia citocromo   P450 &#40;CYP450&#41;; estas enzimas catalizan la oxidaci&oacute;n   de una amplia variedad de sustancias y las transforman   en productos solubles, que se pueden eliminar   f&aacute;cilmente. En particular, las enzimas CYP1A1,   CYP1A2, CYP2A6 y CYP3A4 cumplen un papel fundamental   en la transformaci&oacute;n de la AFB1; algunos   de los metabolitos son: aflatoxina Q1, aflatoxina B2a,   aflatoxina P1 y aflatoxina M1; los tres primeros son   productos de detoxificaci&oacute;n y el &uacute;ltimo &#40;aflatoxina   M1&#41; es un metabolito citot&oacute;xico y carcin&oacute;geno &#40;19&#41;.   El principal metabolito es una forma reactiva muy   inestable, AFB1-8,9-exo-ep&oacute;xido &#40;AFBO&#41;, responsable   de la mayor&iacute;a de los efectos t&oacute;xicos y carcin&oacute;genos. La   AFBO tiene la capacidad de unirse covalentemente   al nitr&oacute;geno 7 del nucle&oacute;tido guanina en el ADN y formar   aductos &#40;8,9-dihidro-8-&#40;N7-guanil&#41;-9-hidroxi-AFB1   o AFB1-N7-Gua&#41; &#40;20,21&#41;. De esta uni&oacute;n se pueden generar   sitios apur&iacute;nicos &#40;AP&#41; o la apertura del anillo   imidazol del aducto &#40;AFB1-N7-Gua&#41;; este &uacute;ltimo genera   una mol&eacute;cula qu&iacute;mica y biol&oacute;gicamente m&aacute;s   estable y menos susceptible de reparar, conocida   como AFB1 formamido pirimidina &#40;AFB1-FAPY&#41; &#40;22&#41;   &#40;<a href="/img/revistas/iat/v27n1/v27n1a5f1.jpg" target="_blank">figura 1</a>&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La detoxificaci&oacute;n de la AFBO es un proceso complejo   en el que est&aacute;n implicadas las enzimas glutati&oacute;n   S-transferasa &#40;GST&#41; y ep&oacute;xido hidrolasa &#40;EPHX&#41;. La   GST media la conjugaci&oacute;n del glutati&oacute;n reducido   &#40;GSH&#41; con el endo y el exoep&oacute;xido para formar el   conjugado AFB1-S-G, que se puede excretar como   &aacute;cido mercapt&uacute;rico-AFB en la orina &#40;23&#41; &#40;<a href="/img/revistas/iat/v27n1/v27n1a5f1.jpg" target="_blank">figura 1</a>&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Diferentes estudios en el modelo murino han demostrado   la eficiente conjugaci&oacute;n de la AFBO con   el glutati&oacute;n mediante una GST clase &alpha;, lo que se correlaciona   con mayor resistencia a la mutagenicidad   asociada a esta toxina, en comparaci&oacute;n con especies   susceptibles como la rata &#40;24&#41;. Los seres humanos presentan   menor actividad de la GST para la conjugaci&oacute;n   de la AFBO que las ratas y los ratones, lo que   sugiere menor capacidad de detoxificaci&oacute;n de este   importante metabolito &#40;21,25,26&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Por otra parte, la EPHX puede disminuir los niveles   de AFB1 exo y endoep&oacute;xido mediante hidr&oacute;lisis generando   AFB1-8,9-dihidrodiol, que por apertura del   anillo puede dar lugar al ion fenolato-dialdeh&iacute;do   &#40;AFB1-dialdeh&iacute;do&#41; y unirse con los grupos amino de   las prote&iacute;nas. Por otra parte, el AFB1-dialdeh&iacute;do puede   ser sustrato de la AFB1-aldeh&iacute;do reductasa &#40;AFAR&#41;   produciendo aflatoxina-dialcohol, que se puede excretar   en la orina en su forma de dialcohol o como   monoalcohol &#40;19,27&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Estudios recientes en distintos tipos de c&aacute;ncer humano   sugieren que existe una asociaci&oacute;n entre la exposici&oacute;n   a un carcin&oacute;geno particular y la generaci&oacute;n de   una mutaci&oacute;n espec&iacute;fica. En el caso de la AFB1, se ha   encontrado que la exposici&oacute;n en la dieta est&aacute; asociada   con la mutaci&oacute;n puntual en el gen p53 &#40;ex&oacute;n 7,   cod&oacute;n 249&#41;. Hasta en el 60&#37; de los casos de HCC se   han documentado mutaciones en el gen p53, espec&iacute;ficamente   la antes nombrada &#40;28&#41;. Esta mutaci&oacute;n se   ha evidenciado en poblaciones que habitan en &aacute;reas   consideradas de alto riesgo de exposici&oacute;n a aflatoxinas   y que presentan alta incidencia de HCC.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b> AFB1 COMO FACTOR DE RIESGO DEL HCC</b>   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La Sociedad Americana del C&aacute;ncer calcul&oacute; que en   el 2005 se presentaron alrededor de 667.000 casos de   CPH en el mundo, lo que representa la quinta neoplasia   m&aacute;s com&uacute;n en la poblaci&oacute;n masculina y la   tercera causa de mortalidad por c&aacute;ncer &#40;29&#41;. El HCC   representa m&aacute;s del 80&#37; de los casos de CPH. Los principales   factores de riesgo asociados incluyen la infecci&oacute;n   cr&oacute;nica por el virus de la hepatitis B &#40;HBV, por   su sigla en ingl&eacute;s&#41; y/o el virus de la hepatitis C &#40;HCV,   por su sigla en ingl&eacute;s&#41;, el consumo cr&oacute;nico de alcohol   y el consumo de alimentos contaminados con AFB1   &#40;29,30&#41;. Existen otros factores de riesgo, entre ellos el   tabaquismo, la exposici&oacute;n a metales pesados, el uso   de anticonceptivos orales y esteroides anab&oacute;licos y la   exposici&oacute;n a aflatoxina &#40;29,31&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La prevalencia del HCC es significativamente diferente   seg&uacute;n el pa&iacute;s, lo que sugiere una variabilidad en la   exposici&oacute;n a los factores de riesgo. La infecci&oacute;n cr&oacute;nica   por HBV y/o HCV es la causa del 70&#37; al 80&#37; de   los casos de HCC, aproximadamente &#40;32&#41;; el HBV es el m&aacute;s importante desde el punto de vista epidemiol&oacute;gico   en &aacute;reas con alta incidencia de HCC como &Aacute;frica,   Asia &#40;excluyendo Jap&oacute;n&#41; y la cuenca Amaz&oacute;nica &#40;33&#41;.   El riesgo de desarrollar HCC es aproximadamente 25 a   35 veces m&aacute;s alto en pacientes con infecci&oacute;n cr&oacute;nica   por HBV que en los no infectados, y 130 veces m&aacute;s   alto en los individuos coinfectados por HBV y HCV,   respecto a los no infectados &#40;32,34&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La mayor&iacute;a de los casos de HCC ocurren en &Aacute;frica Subsahariana   y en el Este de Asia, regiones en las que la   exposici&oacute;n a la AFB1 en la dieta es de particular importancia,   adem&aacute;s de que tienen una alta prevalencia   de infecci&oacute;n por HBV &#40;29,30&#41;. China tiene m&aacute;s del 50&#37;   de los casos en el mundo con una incidencia en hombres   de 35,2/100.000 y en mujeres de 13,3/100.000. Por   el contrario, en Am&eacute;rica, el norte de Europa y Ocean&iacute;a   se presentan tasas bajas de incidencia &#40;5,0/100.000&#41; &#40;35&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Evidencias epidemiol&oacute;gicas han demostrado una clara   asociaci&oacute;n entre la exposici&oacute;n cr&oacute;nica a AFB1 en la   dieta y el riesgo de desarrollar HCC. Los primeros estudios   hechos en los a&ntilde;os 60 y 80 identificaron los alimentos   contaminados con mayor frecuencia, las concentraciones   de la toxina y la frecuencia del consumo   en relaci&oacute;n con la incidencia de CPH &#40;36-38&#41;. En 1982   se efectu&oacute; un estudio de casos y controles en Filipinas   que evalu&oacute; la ingesta de aflatoxina, el consumo de   alcohol y el riesgo de CPH. La evaluaci&oacute;n del riesgo   relativo &#40;RR&#41; de desarrollar CPH, en relaci&oacute;n con el   efecto combinado de la aflatoxina y el alcohol, permiti&oacute;   evidenciar un incremento en el riesgo de carcinog&eacute;nesis   hep&aacute;tica en la poblaci&oacute;n con alta exposici&oacute;n   a aflatoxina y consumo pesado de alcohol. El RR con   baja exposici&oacute;n a aflatoxina y consumo pesado de alcohol   fue de 3,9; en el caso de alta exposici&oacute;n a aflatoxina   y consumo leve de alcohol fue de 17,5, mientras   que el RR asociado con alta exposici&oacute;n a aflatoxina y   consumo pesado de alcohol fue de 35 &#40;39&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En los a&ntilde;os 90 se llevaron a cabo los primeros estudios   de biomarcadores en poblaciones con alta   incidencia de HCC; dichos estudios permitieron obtener   evidencias contundentes de la asociaci&oacute;n entre   el HCC y la alta exposici&oacute;n a aflatoxina, adem&aacute;s de la   sinergia entre esta y otros factores de riesgo &#40;29,40-45&#41;.   En 1992 Ross y colaboradores demostraron una asociaci&oacute;n   entre el marcador de infecci&oacute;n por HBV y   la presencia de metabolitos de AFB1 en muestras de   orina de pacientes chinos con diagn&oacute;stico de HCC &#40;46&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Posteriormente Lunn y colaboradores &#40;1993&#41; y   Wang y colaboradores &#40;1996&#41; hicieron estudios independientes   en pacientes con HCC en poblaci&oacute;n de   Taiw&aacute;n, en los cuales se evaluaron la infecci&oacute;n por   HBV y la exposici&oacute;n a aflatoxinas por detecci&oacute;n de   metabolitos en la orina, complejos AFB1-alb&uacute;mina y   la presencia de aductos. Se logr&oacute; demostrar con ambos   estudios un riesgo mayor de HCC en la presencia   simult&aacute;nea de estos dos factores de riesgo, en comparaci&oacute;n   con lo observado por exposici&oacute;n a HBV o   AFB1 &#40;47,48&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En 1996, el estudio de Chen y colaboradores ratific&oacute;   estos resultados gracias a la evidencia del riesgo de   HCC atribuible a la alta exposici&oacute;n a AFB1 y la endemia   de la infecci&oacute;n por HBV en una cohorte de habitantes,   de 30 a 65 a&ntilde;os, de las islas Pescadores, en Taiw&aacute;n   &#40;49&#41;. La prevalencia de la infecci&oacute;n cr&oacute;nica por HBV   fue de 94&#37; en los casos de HCC diagnosticados en el   grupo de estudio. Adem&aacute;s, se demostr&oacute; una frecuencia   de 65&#37; de complejos AFB1-alb&uacute;mina en los casos de   HCC, comparada con 37&#37; en el grupo control, diferencia   estad&iacute;sticamente significativa seg&uacute;n el an&aacute;lisis   multivariado &#40;49&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El marcador de exposici&oacute;n a aflatoxina m&aacute;s utilizado   y mejor documentado en casos de HCC es la detecci&oacute;n   de una mutaci&oacute;n puntual en el cod&oacute;n 249 del   ex&oacute;n 7 del gen p53. Debido a que se ha demostrado   que la AFB1 forma aductos en posiciones espec&iacute;ficas   <i>&#40;hotspot&#41;</i> en este gen, se ha sugerido que la prote&iacute;na   mutante p53 puede ser responsable de la expansi&oacute;n   clonal selectiva de hepatocitos transformados &#40;50&#41;.   Los aductos en AFB1-N7-Gua han sido relacionados   espec&iacute;ficamente con la transversi&oacute;n de G:C&rarr;T:A en   la tercera base en el cod&oacute;n 249 &#40;48&#41;. Esto se describi&oacute;   por primera vez en dos estudios independientes en   el Sureste de &Aacute;frica &#40;51&#41; y en Quidong, China &#40;52&#41;;   en este &uacute;ltimo estudio se evidenci&oacute; la transversi&oacute;n   puntual en ocho de 16 casos de HCC; tambi&eacute;n se ha   demostrado esta modificaci&oacute;n gen&eacute;tica en estudios   experimentales &#40;50,53&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En general, los estudios han evidenciado alg&uacute;n grado   de heterogeneidad en la frecuencia de la mutaci&oacute;n   en el cod&oacute;n 249 en el gen p53; sin embargo, se considera   esta mutaci&oacute;n como un marcador de exposici&oacute;n   a aflatoxina &#40;48,54&#41;. La transversi&oacute;n G&rarr;C y la transici&oacute;n   G&rarr;A son tambi&eacute;n mutaciones inducidas por la   AFB1, aunque con menor frecuencia &#40;55&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La asociaci&oacute;n geogr&aacute;fica de la exposici&oacute;n a aflatoxina   y la mutaci&oacute;n en el cod&oacute;n 249 se han relacionado   tambi&eacute;n con la alta endemia de HBV; la mayor&iacute;a de   las mutaciones en el cod&oacute;n 249 se han comprobado   en muestras provenientes de individuos con infecci&oacute;n   por HBV. Estudios que comparan la frecuencia   de esta mutaci&oacute;n en &aacute;reas con prevalencias similares   de infecci&oacute;n por HBV, pero con exposici&oacute;n variable   a aflatoxina demostraron un alto porcentaje de la   mutaci&oacute;n en el cod&oacute;n 249 en regiones de alta exposici&oacute;n   a esta micotoxina &#40;48,56&#41;.   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Estudios moleculares han apoyado estos hallazgos   epidemiol&oacute;gicos; al parecer, la prote&iacute;na viral HBx   podr&iacute;a favorecer la fijaci&oacute;n de mutaciones en el sitio   de la formaci&oacute;n de aductos o cerca de &eacute;l, por inhibici&oacute;n   de la reparaci&oacute;n por escisi&oacute;n de nucle&oacute;tidos   &#40;NER&#41; dependiente o independiente de p53 &#40;57&#41;.   Otras investigaciones han demostrado la interacci&oacute;n   de HBx con mol&eacute;culas implicadas en el sistema NER   acoplado a la transcripci&oacute;n como xeroderma pigmentosum   grupo B &#40;XPB&#41; y el factor de transcripci&oacute;n   &lsquo;F' de tipo II &#40;TFIIF&#41;, lo que impide la reparaci&oacute;n por   uni&oacute;n directa al ADN &#40;58&#41;. En ensayos <i>in vitro</i> en la   l&iacute;nea celular HepG2, que se caracteriza por expresar   la prote&iacute;na p53 silvestre, y luego de transfecci&oacute;n con   HBx, se demostr&oacute; una mayor suceptibilidad a la acci&oacute;n   citot&oacute;xica de la AFBO, con respecto a las c&eacute;lulas control,   adem&aacute;s de un aumento en la frecuencia de la   mutaci&oacute;n AGG a AGT en comparaci&oacute;n con las c&eacute;lulas   control &#40;58&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Otra hip&oacute;tesis de la sinergia entre el HBV y la exposici&oacute;n   a aflatoxina es que la infecci&oacute;n viral altera   la expresi&oacute;n de las enzimas involucradas en el metabolismo   de la aflatoxina y como consecuencia se   genera un incremento en la formaci&oacute;n de aductos.   Estudios en ratones transg&eacute;nicos que expresan el   ant&iacute;geno de superficie del HBV &#40;HBsAg&#41; han revelado   la inducci&oacute;n de la expresi&oacute;n del citocromo P450   &#40;CYP1A y CPY2A5&#41; en asociaci&oacute;n con el da&ntilde;o hep&aacute;tico   &#40;59&#41;; tambi&eacute;n se ha observado una disminuci&oacute;n   significativa en la expresi&oacute;n de la GST, lo que provoca   un desequilibrio en la activaci&oacute;n y detoxificaci&oacute;n   del carcin&oacute;geno durante la infecci&oacute;n &#40;20&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Una hip&oacute;tesis alternativa con respecto a esta sinergia   es que la exposici&oacute;n al carcin&oacute;geno puede alterar la   infecci&oacute;n y replicaci&oacute;n virales. En un estudio en el   modelo animal de la infecci&oacute;n por el virus de la hepatitis   del pato &#40;DHBV, por su sigla en ingl&eacute;s&#41; y tras la exposici&oacute;n   a AFB, se encontr&oacute; un aumento en la carga viral   &#40;60&#41;; adem&aacute;s, en estudios <i>in vitro </i>en c&eacute;lulas HepG2   tambi&eacute;n se demostr&oacute; una elevaci&oacute;n de los niveles de   HBsAg despu&eacute;s del tratamiento con AFB &#40;61&#41; &#40;<a href="/img/revistas/iat/v27n1/v27n1a5f2.jpg" target="_blank">figura 2</a>&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Con respecto a la exposici&oacute;n a aflatoxinas en Latinoam&eacute;rica   los datos publicados son escasos. La exploraci&oacute;n   de biomarcadores se limita a algunos estudios en   Cuba, M&eacute;xico, Brasil y Colombia &#40;62-66&#41;, as&iacute; como a la   evaluaci&oacute;n de la incidencia del HCC y su relaci&oacute;n con   la exposici&oacute;n a aflatoxinas en la dieta &#40;16&#41;. Un estudio   en Cuba con 40 pacientes demostr&oacute; la presencia de   complejos AFB1-alb&uacute;mina en 32,5&#37; de las muestras   de pacientes con infecci&oacute;n cr&oacute;nica por HBV y en 15&#37;   de los individuos sanos &#40;62&#41;; estos resultados sugieren   la validez de los complejos AFB1-alb&uacute;mina como un   marcador de exposici&oacute;n a la micotoxina. Por otra   parte, un estudio de 210 pacientes en M&eacute;xico detect&oacute;   la presencia de aductos de AFB1-ADN en muestras de   orina en 50&#37; de los casos con infecci&oacute;n por HBV, 26&#37;   de los pacientes con cirrosis hep&aacute;tica de origen viral,   10&#37; de los que ten&iacute;an cirrosis alcoh&oacute;lica y 10&#37; en los   individuos sanos &#40;63&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La transversi&oacute;n G:C&rarr;T:A en la tercera posici&oacute;n del   cod&oacute;n 249 ocasiona el cambio de un amino&aacute;cido   arginina por serina &#40;mutaci&oacute;n 249ser&#41;; esta mutaci&oacute;n   altera el dominio de uni&oacute;n de la prote&iacute;na p53 al ADN   &#40;28&#41;. Con respecto a esta mutaci&oacute;n en casos de HCC   solo se han publicado tres estudios. El primero, hecho   en M&eacute;xico con 16 muestras de HCC, en el que se describi&oacute;   una frecuencia de 19&#37; de la mutaci&oacute;n 249ser &#40;64&#41;.   El segundo, en Brasil, pa&iacute;s en que el nivel m&aacute;ximo   permitido de AFB1 en los alimentos es mayor que en   Norteam&eacute;rica y Europa; la frecuencia de la mutaci&oacute;n   249ser fue de 28&#37; &#40;21/74&#41; detectada por la t&eacute;cnica de   PCR-RFLP <i>&#40;Restriction Fragment Length Polymorphism&#41;</i>,   y de 16&#37; detectada por secuenciaci&oacute;n directa &#40;65&#41;.   En un estudio reciente se evalu&oacute; por primera vez la   presencia de esta mutaci&oacute;n puntual 249ser en casos   de HCC en Colombia, registrados en cuatro instituciones   de las tres ciudades m&aacute;s importantes, Bogot&aacute;,   Medell&iacute;n y Cali. La presencia de la mutaci&oacute;n 249ser se   confirm&oacute; por las t&eacute;cnicas PCR-RFLP y secuenciaci&oacute;n   en el 10,5&#37; &#40;4/38&#41; de las muestras &#40;66&#41;. Los datos de   frecuencia de la mutaci&oacute;n 249ser de 16&#37; en poblaci&oacute;n   de Brasil y 10,5&#37; en poblaci&oacute;n de Colombia sugieren   que estos pa&iacute;ses latinoamericanos podr&iacute;an tener una   exposici&oacute;n moderada a AFB1.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Aunque en Colombia la tasa de incidencia de HCC es   baja &#40;2,2/100.000 en hombres y 2,0/100.000 en mujeres   para el a&ntilde;o 2001&#41; &#40;31,67&#41;, posiblemente el consumo   de aflatoxinas en la dieta sea un factor de riesgo importante   en la etiolog&iacute;a de esta neoplasia, ya sea de   manera independiente o debido a una sinergia con el   HBV en las regiones del pa&iacute;s en donde es prevalente la   infecci&oacute;n por este virus, y/o una sinergia con el consumo   cr&oacute;nico de alcohol. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>FACTORES GEN&Eacute;TICOS, METABOLISMO   Y SUSCEPTIBILIDAD AL HCC</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Adem&aacute;s de los factores de riesgo asociados al desarrollo   de HCC, estudios de epidemiolog&iacute;a molecular han   demostrado que el riesgo puede estar condicionado   tanto en la poblaci&oacute;n como individualmente por las   diferencias en la susceptibilidad gen&eacute;tica, principalmente   relacionada con polimorfismos de genes que   codifican para las enzimas implicadas en mecanismos   de bioactivaci&oacute;n y detoxificaci&oacute;n de sustancias carcin&oacute;genas   como la AFB1 &#40;68-72&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Numerosos estudios han demostrado que existe   variabilidad en el nivel de expresi&oacute;n de las familias   enzim&aacute;ticas m&aacute;s importantes involucradas en el metabolismo   de la AFB1, algunas de las cuales permiten   que la AFBO pueda unirse al ADN, al ARN y/o a prote&iacute;nas   como la alb&uacute;mina &#40;73&#41;. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Por ejemplo, el gen que codifica para la EPHX tiene   dos sitios polim&oacute;rficos de importancia en los exones 3 y   4. En el ex&oacute;n 3, el alelo 113Y codifica para una tirosina   &#40;Try&#41;, mientras que el 113H lo hace para una histidina   &#40;His&#41;. Las variantes al&eacute;licas en el ex&oacute;n 4, 139H y 139R,   resultan en prote&iacute;nas con histidina y arginina en la   posici&oacute;n 139, respectivamente. Tanto el alelo 113H   como el 139H est&aacute;n relacionados con la disminuci&oacute;n   en la expresi&oacute;n de la enzima o de la estabilidad y por   tanto esto puede estar asociado con el riesgo de desarrollar   HCC. En particular, la poca actividad de la enzima   descrita para la variante 113H se ha asociado con un   aumento en el riesgo de HCC en diferentes estudios   en poblaci&oacute;n de China &#40;68,69&#41;. La frecuencia de este polimorfismo es muy variable seg&uacute;n la poblaci&oacute;n de   estudio. En Gambia, menos del 2&#37; de la poblaci&oacute;n es   homocigota para la variante 113H &#40;EPXH HH&#41;, mientras   que este porcentaje en poblaciones cauc&aacute;sica y china   es del 8&#37; y el 35&#37;, respectivamente &#40;72&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Adem&aacute;s se ha planteado que los individuos que expresan   un alto nivel de CYP3A5 pueden tener un riesgo   mayor de desarrollar HCC, debido a que al haber mayor   activaci&oacute;n es posible que se sature el sistema de detoxificaci&oacute;n,   favoreciendo la formaci&oacute;n de aductos en el   ADN &#40;74&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La importancia de los estudios de epidemiolog&iacute;a   molecular en poblaciones expuestas a los factores de   riesgo involucrados en el desarrollo del HCC, en especial   la exposici&oacute;n a AFB1 en la dieta, radica en que el   conocimiento de las variantes gen&eacute;ticas de las enzimas   implicadas en su metabolismo es una herramienta   para las autoridades de salud p&uacute;blica en programas   de prevenci&oacute;n o disminuci&oacute;n del riego de poblaciones   expuestas; tambi&eacute;n para establecer los l&iacute;mites en   los niveles de exposici&oacute;n seg&uacute;n el perfil gen&eacute;tico.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"> <b>CONCLUSIONES</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los estudios epidemiol&oacute;gicos sobre la exposici&oacute;n a   aflatoxinas en la dieta evidencian que este fen&oacute;meno   es propio de ciertas regiones donde las condiciones   ambientales y de salud, el manejo inadecuado de los   alimentos y la escasez de recursos facilitan la contaminaci&oacute;n   de los mismos; sin embargo, es posible que   este problema tambi&eacute;n est&eacute; afectando a otras regiones   del mundo con condiciones menos extremas, en   donde se han hecho pocos estudios o se desconoce el   problema por completo. Es importante llevar a cabo   investigaciones que permitan conocer el impacto de   este factor de riesgo en regiones diferentes a pa&iacute;ses   de Asia y &Aacute;frica, especialmente en donde se conoce   o se presume que es alta la endemia de infecci&oacute;n por   HBV o que hay otros factores &#40;virales, ambientales o   gen&eacute;ticos&#41; que puedan incrementar el riesgo de desarrollar   HCC.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>AGRADECIMIENTOS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Los autores agradecen la financiaci&oacute;n del programa   de sostenibilidad de la Vicerrector&iacute;a de Investigaci&oacute;n   de la Universidad de Antioquia y del Departamento   Nacional de Ciencia, Innovaci&oacute;n y Tecnolog&iacute;a,   Colciencias.   </font></p>     <p>&nbsp;</p>     ]]></body>
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