<?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>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762004000100011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Hígado graso no alcohólico. Nuevos conceptos]]></article-title>
<article-title xml:lang="en"><![CDATA[An update on non-alcoholic fatty liver disease]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez Sánchez]]></surname>
<given-names><![CDATA[Nahum]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chávez-Tapia]]></surname>
<given-names><![CDATA[Norberto C.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Uribe]]></surname>
<given-names><![CDATA[Misael]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Fundación Clínica Médica Sur Departamentos de Investigación Biomédica ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2004</year>
</pub-date>
<volume>56</volume>
<numero>1</numero>
<fpage>72</fpage>
<lpage>82</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762004000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762004000100011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762004000100011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Non alcoholic fatty liver disease is a disease of emerging identity and importance. It is frequently associated with obesity, especially visceral fat, and is intimately related to fatty liver and markers of insulin resistance. Both the prevalence and the severity of liver steatosis are related to body mass index, waist circumference, hyperinsulinaemia, hypertriglyceridaemia and impaired glucose tolerance or type 2 diabetes. The identification fatty liver disease in obese patients, is very important in order to prevent complications such as steathohepatitis and cirrhosis. The pathogenesis of non alcoholic fatty liver disease is very complex, there are mitochondrial morphologic and functional alterations, as well as, high sensitivity to injurious stimulus, an increased inflammatory activity, and modifications in cellular metabolism at post-receptor level. Weight reduction is one of the first steps in the treatment of patients with non alcoholic fatty liver disease, as well as the management of associated conditions such as obesity, diabetes mellitus and hyperlipidaemia. Antioxidants, and others drugs such as ursodeoxycholic acid may be beneficial in the treatment of non alcoholic fatty liver disease. These medications, however, need first to be tested in well-controlled trials with clinically relevant end-points and extended follow-up. In this review, we analyze the new concepts in epidemiology, pathophysiology and treatment of this disease.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El hígado graso no alcohólico es una enfermedad emergente de gran importancia en el momento actual. Esta entidad se asocia frecuentemente con obesidad y resistencia a la insulina. Su prevalencia y gravedad están en relación con variables como el índice de masa corporal, cintura, hiperinsulinemia, hipertrigliceridemia y resistencia a la insulina. La identificación de estos pacientes es de capital importancia con el objetivo de prevenir las complicaciones potenciales como la esteatohepatitis no alcohólica o la cirrosis. Dentro de la patogenia del hígado graso no alcohólico se han descrito alteraciones funcionales y morfológicas a nivel mitocondrial, otros factores implicados son una mayor susceptibilidad a estímulos nocivos, incremento en la actividad inflamatoria y modificaciones en la maquinaria celular a nivel postreceptor. Por lo tanto, las modalidades terapéuticas son diversas, siendo la medida más útil el adecuado control del peso, así como el manejo de las enfermedades concomitantes. El uso de antioxidantes y otros fármacos citoprotectores como el ácido ursodesoxicólico han mostrado cierto beneficio, aunque se requieren análisis a largo plazo para corroborar estas observaciones. En esta revisión analizamos los conceptos más recientes sobre epidemiología, fisiopatología y tratamiento de esta enfermedad.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Non alcoholic fatty liver disease]]></kwd>
<kwd lng="en"><![CDATA[Steatohepatitis]]></kwd>
<kwd lng="en"><![CDATA[Obesity]]></kwd>
<kwd lng="en"><![CDATA[Insulin resistance]]></kwd>
<kwd lng="en"><![CDATA[Weight reduction]]></kwd>
<kwd lng="en"><![CDATA[Antioxidants]]></kwd>
<kwd lng="es"><![CDATA[Hígado graso no alcohólico]]></kwd>
<kwd lng="es"><![CDATA[Esteatohepatitis]]></kwd>
<kwd lng="es"><![CDATA[Obesidad]]></kwd>
<kwd lng="es"><![CDATA[Resistencia a la insulina]]></kwd>
<kwd lng="es"><![CDATA[Reducción de peso]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><font size="2" face="Verdana">Rev Invest Cl&iacute;n 2004; Vol. 56(1):72-82    <br> <b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b><font size="4">H&iacute;gado graso no alcoh&oacute;lico. Nuevos conceptos</font></b></font></p>     <p><b><i>An update on non-alcoholic fatty liver disease</i></b></p>     <p><b><font size="2" face="Verdana">Nahum M&eacute;ndez S&aacute;nchez    <br>   Norberto C. Ch&aacute;vez-Tapia    <br>   Misael Uribe</font></b><font size="2" face="Verdana">    <br> Departamento de Investigaci&oacute;n Biom&eacute;dica, Gastroenterolog&iacute;a &amp; Unidad de H&iacute;gado. Fundaci&oacute;n Cl&iacute;nica M&eacute;dica Sur. M&eacute;xico, D.F, M&eacute;xico.</font></p>     <p><font size="2" face="Verdana"><b><i>Reimpresos:</i></b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><b>Nahum M&eacute;ndez -S&aacute;nchez M.D., Ph.D.    <br>   </b>Departamentos de Investigaci&oacute;n Biom&eacute;dica,    <br>   Gastroenterolog&iacute;a &amp; Unidad de H&iacute;gado.    <br>   Fundaci&oacute;n Cl&iacute;nica M&eacute;dica Sur    <br>   Puente de Piedra 150    <br>   Col. Tiruello Guerra, 14050, M&eacute;xico, D.F.    <br>   Tel&eacute;fono: (+525) 606-6222,    <br>   Ext. 4215 Fax: (+525) 666-4031 y 606-1654;    <br>   Correo electr&oacute;nico: <a href="mailto:nmendez@medicasur.org.mx">nmendez@medicasur.org.mx</a></font></p>     <p><font size="2" face="Verdana"><i>Recibido el 24 de julio de 2003.    ]]></body>
<body><![CDATA[<br> Aceptado el 14 de octubre de 2003.</i> </font></p>     <p><font size="2" face="Verdana"><b><i>ABSTRACT</i></b></font></p>     <p><font size="2" face="Verdana"><i>Non alcoholic fatty liver disease is a disease of emerging identity and importance. It is frequently associated with obesity, especially visceral fat, and is intimately related to fatty liver and markers of insulin resistance. Both the prevalence and the severity of liver steatosis are related to body mass index, waist circumference, hyperinsulinaemia, hypertriglyceridaemia and impaired glucose tolerance or type 2 diabetes. The identification fatty liver disease in obese patients, is very important in order to prevent complications such as steathohepatitis and cirrhosis. The pathogenesis of non alcoholic fatty liver disease is very complex, there are mitochondrial morphologic and functional alterations, as well as, high sensitivity to injurious stimulus, an increased inflammatory activity, and modifications in cellular metabolism at post-receptor level. Weight reduction is one of the first steps in the treatment of patients with non alcoholic fatty liver disease, as well as the management of associated conditions such as obesity, diabetes mellitus and hyperlipidaemia. Antioxidants, and others drugs such as ursodeoxycholic acid may be beneficial in the treatment of non alcoholic fatty liver disease. These medications, however, need first to be tested in well-controlled trials with clinically relevant end-points and extended follow-up. In this review, we analyze the new concepts in epidemiology, pathophysiology and treatment of this disease.</i></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><i><b>Key words.</b>Non alcoholic fatty liver disease. Steatohepatitis. Obesity. Insulin resistance. Weight reduction. Antioxidants.</i></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana">El h&iacute;gado graso no alcoh&oacute;lico es una enfermedad emergente de gran importancia en el momento actual. Esta entidad se asocia frecuentemente con obesidad y resistencia a la insulina. Su prevalencia y gravedad est&aacute;n en relaci&oacute;n con variables como el &iacute;ndice de masa corporal, cintura, hiperinsulinemia, hipertrigliceridemia y resistencia a la insulina. La identificaci&oacute;n de estos pacientes es de capital importancia con el objetivo de prevenir las complicaciones potenciales como la esteatohepatitis no alcoh&oacute;lica o la cirrosis. Dentro de la patogenia del h&iacute;gado graso no alcoh&oacute;lico se han descrito alteraciones funcionales y morfol&oacute;gicas a nivel mitocondrial, otros factores implicados son una mayor susceptibilidad a est&iacute;mulos nocivos, incremento en la actividad inflamatoria y modificaciones en la maquinaria celular a nivel postreceptor. Por lo tanto, las modalidades terap&eacute;uticas son diversas, siendo la medida m&aacute;s &uacute;til el adecuado control del peso, as&iacute; como el manejo de las enfermedades concomitantes. El uso de antioxidantes y otros f&aacute;rmacos citoprotectores como el &aacute;cido ursodesoxic&oacute;lico han mostrado cierto beneficio, aunque se requieren an&aacute;lisis a largo plazo para corroborar estas observaciones. En esta revisi&oacute;n analizamos los conceptos m&aacute;s recientes sobre epidemiolog&iacute;a, fisiopatolog&iacute;a y tratamiento de esta enfermedad. </font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Palabras clave. </b>H&iacute;gado graso no alcoh&oacute;lico. Esteatohepatitis. Obesidad. Resistencia a la insulina. Reducci&oacute;n de peso.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>INTRODUCCI&Oacute;N </b></font></p>     <p><font size="2" face="Verdana">La cirrosis criptog&eacute;nica es la causante de 3 a 31% de todos los casos de hepatopat&iacute;a, condicionando de 7 a 14% de los trasplantes hep&aacute;ticos. Interesantemente, el porcentaje de cirrosis criptog&eacute;nica disminuy&oacute; al demostrar que 70% de estos casos eran debidos a h&iacute;gado graso no alcoh&oacute;lico. <SUP>1-3</SUP> En 1980 Ludwig y cols. <SUP>3</SUP> acuñan el nombre de esteatohepatitis a un s&iacute;ndrome cl&iacute;nico-patol&oacute;gico bien reconocido que se presenta predominantemente en personas con obesidad, del g&eacute;nero femenino, con diabetes mellitus en los cuales no existe el antecedente de consumo y/o abuso de alcohol, pero en los que la biopsia hep&aacute;tica muestra cambios histopatol&oacute;gicos similares a los que se observan en hepatitis alcoh&oacute;lica. <SUP>3</SUP> En los &uacute;ltimos 20 años ha existido un inter&eacute;s creciente por determinar las caracter&iacute;sticas cl&iacute;nicas, epidemiol&oacute;gicas y fisiopatol&oacute;gicas de este s&iacute;ndrome; en especial ante la adici&oacute;n del s&iacute;ndrome de resistencia a la insulina, el cual parece formar parte de esta entidad patol&oacute;gica y de las enfermedades que lo rodean. El objetivo de esta revisi&oacute;n es analizar las caracter&iacute;sticas cl&iacute;nicas, epidemiol&oacute;gicas, fisiopatol&oacute;gicas, y terap&eacute;uticas m&aacute;s importantes relacionadas con esta entidad.</font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>DEFINICI&Oacute;N </b></font></p>     <p><font size="2" face="Verdana">El t&eacute;rmino h&iacute;gado graso no alcoh&oacute;lico (NAFLD por sus siglas en ingl&eacute;s) incluye alteraciones m&iacute;nimas que van desde la esteatosis hep&aacute;tica hasta la cirrosis e insuficiencia hep&aacute;tica. <SUP>4</SUP> Esta enfermedad ha recibido distintas denominaciones incluyendo hepatitis grasa, enfermedad de Laënnec no alcoh&oacute;lica, hepatitis diab&eacute;tica, hepatopat&iacute;a parecida a la alcoh&oacute;lica, y esteatohepatitis no alcoh&oacute;lica (NASH por sus siglas en ingl&eacute;s). <SUP>5</SUP> La diversidad de t&eacute;rminos, asociada a la falta de sensibilidad y especificidad de las pruebas no invasivas para el diagn&oacute;stico de NAFLD ha dificultado su precisi&oacute;n diagn&oacute;stica, as&iacute; como establecer su incidencia y prevalencia. Desde 1980 y durante los siguientes 20 años surgieron diversos criterios diagn&oacute;sticos, <SUP>3,4,6-8</SUP> que en forma global toman en consideraci&oacute;n los siguientes aspectos: <SUP>9</SUP></font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><B>Histolog</B>&iacute;<B>a</B></font></p>     <p><font size="2" face="Verdana">Biopsia hep&aacute;tica con datos de degeneraci&oacute;n grasa macrovesicular moderada a avanzada, inflamaci&oacute;n (lobular o portal) que se pueden acompañar o no de cuerpos de Mallory, fibrosis o cirrosis (<a href="#fig1">Figura 1</a>).</font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><font size="2" face="Verdana"><img src="/img/revistas/ric/v56n1/n1a11f1.jpg" width=333 height=573 alt="Click para agrandar"><a name="fig1"></a></font></p>     <p align="center">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B>Uso de alcohol </B> </font></p>     <p align="left"><font size="2" face="Verdana">Falta de consumo de etanol confirmado por miembros de la familia, m&eacute;dicos de atenci&oacute;n primaria o pruebas de laboratorio. En el momento actual no existen elementos que determinen la dosis discriminatoria de alcohol.</font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B>Enfermedades concomitantes </B> </font></p>     <p align="left"><font size="2" face="Verdana">Ausencia de otras enfermedades hep&aacute;ticas activas. La falta de un consenso internacional para definir a la NALFD gener&oacute; diversas definiciones operativas que van desde la rigurosidad histopatol&oacute;gica, <SUP>10</SUP> hasta la flexibilidad de recientes estudios epidemiol&oacute;gicos. <SUP>11</SUP>La Asociaci&oacute;n Americana para el Estudio de las Enfermedades del H&iacute;gado, public&oacute; un consenso internacional para el diagn&oacute;stico de NASH (<a href="/img/revistas/ric/v56n1/n1a11c1.jpg" target="_blank">Cuadro 1</a>). <SUP>12</SUP></font></p>     <p align="left"><font size="2" face="Verdana">Considerando que la resistencia a la insulina juega un papel importante en la fisiopatolog&iacute;a de la NAFLD y NASH, la determinaci&oacute;n de un marcador de resistencia a la insulina en la evaluaci&oacute;n de estos pacientes parece ser razonable. Sin embargo, la determinaci&oacute;n de resistencia a la insulina merece consideraciones metodol&oacute;gicas importantes que quedan fuera de los objetivos de esta revisi&oacute;n. </font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B>Epidemiolog</B>&iacute;<B>a </B> </font></p>     ]]></body>
<body><![CDATA[<p align="left"><font size="2" face="Verdana">Dependiendo del criterio diagn&oacute;stico utilizado la prevalencia de la NAFLD va de 2.8% hasta 25% en la poblaci&oacute;n general. <SUP>11,13,14</SUP> Recientemente se ha publicado una prevalencia promedio de 16%, considerando poblaciones con caracter&iacute;sticas demogr&aacute;ficas diferentes. <SUP>15</SUP> Esta prevalencia es mucho mayor en grupos de alto riesgo, alcanzando valores de entre 70-86%, en pacientes obesos y/o diab&eacute;ticos. <SUP>16,17</SUP> La relaci&oacute;n NASH/NAFLD se estima de 1:10 aproximadamente, tomando como base estudios histopatol&oacute;gicos, <SUP>18</SUP> la importancia cl&iacute;nica de estos datos radica en que hasta 90% de los casos diagnosticados como cirrosis criptog&eacute;nica son consecuencia de NAFLD. <SUP>19</SUP> Las condiciones asociadas a esta patolog&iacute;a fueron descritas hace m&aacute;s de 20 años, y desde entonces se determin&oacute; su importancia en el desarrollo y evoluci&oacute;n de la enfermedad (<a href="/img/revistas/ric/v56n1/n1a11c2.jpg" target="_blank">Cuadro 2</a>).</font></p>     <p align="left"><font size="2" face="Verdana">Uno de los elementos que juega un papel protag&oacute;nico es la obesidad, la cual tiene efectos delet&eacute;reos en el pron&oacute;stico de otras enfermedades hep&aacute;ticas distintas a la NAFLD. <SUP>20-23</SUP> A pesar de que la obesidad se encuentra com&uacute;nmente asociada a NAFLD, no se observa en 100% de los casos. En diversas cohortes de pacientes obesos la prevalencia de NAFLD var&iacute;a entre 50 a 90%, observ&aacute;ndose una prevalencia mayor en pacientes del g&eacute;nero femenino. <SUP>14</SUP>   Se estima que 65% de los pacientes con niveles elevados de alaninoaminotransferasa se pueden explicar por el sobrepeso y obesidad.  <SUP>11</SUP> Los h&aacute;bitos alimentarios son un factor importante en el desarrollo de NASH, incluso en pacientes no obesos; de los indicadores que se asocian con m&aacute;s frecuencia al desarrollo de NASH, es el porcentaje de energ&iacute;a total y el porcentaje total de grasa ingerida, este &uacute;ltimo en especial es hasta seis veces m&aacute;s alto en pacientes con NASH. <SUP>24</SUP> De igual manera se ha observado que los pacientes con NASH tienen un consumo m&aacute;s alto de colesterol al d&iacute;a, un consumo menor de grasa poliinsaturada y fibra. Estos datos sin duda son de gran valor para el desarrollo de estrategias de tipo alimentario que disminuyan la prevalencia de la enfermedad incluso en pacientes no obesos.24 Tomando en consideraci&oacute;n los factores gen&eacute;ticos y ambientales que influyen en la historia natural de la NAFLD, se estima que hasta 0.3% de los pacientes con predisposici&oacute;n gen&eacute;tica pueden desarrollar cirrosis hep&aacute;tica (<a href="#fig1">Figura 1</a>).</font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B>Fisiopatolog</B>&iacute;<B>a </B> </font></p>     <p align="left"><font size="2" face="Verdana">La fisiopatolog&iacute;a de la NAFLD no ha sido determinada por completo, tomando en consideraci&oacute;n los m&uacute;ltiples factores que intervienen en su desarrollo. Existen cambios muy bien definidos que desencadenan el daño citop&aacute;tico en estos pacientes, tales como la acumulaci&oacute;n de l&iacute;pidos dentro de los hepatocitos, principalmente en forma de triglic&eacute;ridos. <SUP>5</SUP>Con base en los estudios epidemiol&oacute;gicos se ha observado que los principales factores de riesgo para desarrollar NAFLD guardan relaci&oacute;n estrecha con el s&iacute;ndrome de resistencia a la insulina, por lo que la respuesta del h&iacute;gado al s&iacute;ndrome de resistencia a la insulina ha sido determinante en el entendimiento de esta patolog&iacute;a. <SUP>24-26</SUP>La infiltraci&oacute;n grasa del h&iacute;gado surge como respuesta a una gran variedad de est&iacute;mulos nocivos que incluyen hipoxia, toxinas, inflamaci&oacute;n sist&eacute;mica, neoplasias malignas, ayuno, deficiencias nutricionales y diversas alteraciones metab&oacute;licas. <SUP>17,18</SUP> Aunque el h&iacute;gado graso es por s&iacute; mismo una condici&oacute;n benigna, puede participar en la progresi&oacute;n de fibrosis, hacia cirrosis y la falla hep&aacute;tica. <SUP>8</SUP> Los efectos de la obesidad y la consecuente infiltraci&oacute;n grasa en el h&iacute;gado afectan de forma delet&eacute;rea la evoluci&oacute;n de las hepatopat&iacute;as cr&oacute;nicas y de las hepatopat&iacute;as terminales. Ratziu y cols. <SUP>24</SUP> demostraron que los pacientes con cirrosis criptog&eacute;nica y cirrosis por infecci&oacute;n por el virus de hepatitis C que presentan obesidad tienen una calificaci&oacute;n de Child m&aacute;s alta que aquellos pacientes de las mismas caracter&iacute;sticas pero sin obesidad, incluso la mortalidad acumulada es mayor para aquellos que tienen obesidad. <SUP>24</SUP> En pacientes con infecci&oacute;n por el virus de hepatitis C el &iacute;ndice de masa corporal es un predictor independiente tanto de fibrosis y esteatosis; <SUP>27</SUP> esta misma relaci&oacute;n se observa en pacientes sin infecci&oacute;n por el virus de hepatitis C. <SUP>28</SUP>Una de las consecuencias m&aacute;s importantes de la obesidad es el hiperinsulinismo <SUP>29</SUP> que se considera uno de los elementos principales en el desarrollo del s&iacute;ndrome metab&oacute;lico, <SUP>30</SUP> existe una relaci&oacute;n directa entre el grado de infiltraci&oacute;n grasa del h&iacute;gado y la sensibilidad a la insulina, incluso de forma independiente al &iacute;ndice de masa corporal, distribuci&oacute;n de grasa intraabdominal y obesidad general, <SUP>31</SUP> aunque est&aacute; determinado que la obesidad visceral guarda relaci&oacute;n con el tamaño y contenido de grasa del h&iacute;gado. <SUP>32</SUP> En torno a la distribuci&oacute;n de grasa corporal, la relaci&oacute;n cintura/cadera es uno de los factores que m&aacute;s influyen en el incremento del riesgo relativo de desarrollar esteatosis hep&aacute;tica (OR 3.7). <SUP>32</SUP>Existe una relaci&oacute;n cl&iacute;nica directa importante entre el n&uacute;mero de componentes del s&iacute;ndrome metab&oacute;lico y el grado de esteatosis hep&aacute;tica (<a href="#cuadro3">Cuadro 3</a>). La presencia de cuatro componentes del s&iacute;ndrome metab&oacute;lico: distribuci&oacute;n de grasa corporal, intolerancia a la glucosa, hipertensi&oacute;n y dislipidemia, se correlacionan de forma significativa con el grado de infiltraci&oacute;n grasa en el h&iacute;gado. Los efectos del s&iacute;ndrome metab&oacute;lico no &uacute;nicamente influyen en el grado de esteatosis, ya que el grado de fibrosis hep&aacute;tica tiene una correlaci&oacute;n directa con las concentraciones de glucosa de ayuno, relaci&oacute;n cintura/cadera, &iacute;ndice de masa corporal y la presencia de diabetes mellitus. De hecho, uno de los predictores m&aacute;s importantes para el desarrollo de cirrosis en pacientes obesas es la presencia de diabetes. <SUP>17</SUP> Diversos mecanismos han sido propuestos para explicar el daño del hepatocito en los pacientes obesos, los cuales se han postulado como mecanismos adaptativos ante el incremento en la capacidad de oxidaci&oacute;n de sustratos, observ&aacute;ndose un incremento en el transporte de electrones en modelos animales obesos, lo que incrementa las concentraciones locales de especies reactivas de ox&iacute;geno. <SUP>33</SUP> Estas adaptaciones al stress cr&oacute;nico incluyen inhibici&oacute;n del gen de la ciclina D-1, activaci&oacute;n aumentada del transductor de señal y activador de la transcripci&oacute;n 3 (Stat-3, por sus siglas en ingl&eacute;s), depleci&oacute;n del ATP hep&aacute;tico e inhibici&oacute;n de los estados replicativos del ciclo celular. <SUP>34</SUP> En pacientes con NASH y diabetes se observan cambios en el funcionamiento mitocondrial, alteraciones estructurales asociadas a incremento en la liberaci&oacute;n de &aacute;cidos grasos libres, as&iacute; como un incremento en la &#946;-oxidaci&oacute;n de los &aacute;cidos grasos que favorece la formaci&oacute;n de radicales libres. <SUP>35</SUP></font></p>     <p align="left">&nbsp;</p>     <p align="center"><font size="2" face="Verdana"><img src="/img/revistas/ric/v56n1/n1a11c3.jpg" width=380 height=164 alt="Click para agrandar"><a name="cuadro3"></a></font></p>     <p align="center">&nbsp;</p>     <p align="left"><font size="2" face="Verdana">Aunado a este incremento en la producci&oacute;n de especies reactivas de ox&iacute;geno, en modelos animales se demuestra que el h&iacute;gado de los animales obesos es mucho m&aacute;s sensible a los est&iacute;mulos nocivos, en especial ante la respuesta al factor de necrosis tumoral &#945;(TNF&#945;), y a endotoxinas. Existen adem&aacute;s alteraciones inmunol&oacute;gicas que pueden influir en el desarrollo de fibrosis, en especial se observa disminuci&oacute;n de los fagocitos en las zonas 1 y 2 de los acinos hep&aacute;ticos de ratas obesas. Los mecanismos moleculares implicados en esta sensibilizaci&oacute;n no son claros del todo; sin embargo, la sobreexpresi&oacute;n del interfer&oacute;n &#947; (IF&#947;) ante la exposici&oacute;n de lipopolisac&aacute;ridos parece ser uno de los mecanismos m&aacute;s importantes. <SUP>36</SUP>El metabolismo de los &aacute;cidos grasos libres muestra ciertas particularidades que influyen en el desarrollo de resistencia a la insulina y se reflejan en las alteraciones hep&aacute;ticas que condicionan el desarrollo de NAFLD. Es ampliamente aceptado que el incremento en la disponibilidad y utilizaci&oacute;n de los &aacute;cidos grasos libres contribuye al desarrollo de resistencia a la insulina a nivel musculoesquel&eacute;tico, adem&aacute;s se ha observado que los &aacute;cidos grasos libres incrementan la producci&oacute;n end&oacute;gena de glucosa y se les ha documentado diversos mecanismos de toxicidad directa e indirecta, que en conjunto pueden influir en el daño ocasionado en NAFLD (<a href="#cuadro4">Cuadro 4</a>). <SUP>12</SUP></font></p>     <p align="left">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><font size="2" face="Verdana"><img src="/img/revistas/ric/v56n1/n1a11c4.jpg" width=380 height=281 alt="Click para agrandar"><a name="cuadro4"></a></font></p>     <p align="center">&nbsp;</p>     <p align="left"><font size="2" face="Verdana">Los efectos de los &aacute;cidos grasos libres tambi&eacute;n involucran cambios en la producci&oacute;n de factores transportadores de prote&iacute;nas y factores de transcripci&oacute;n determinantes del funcionamiento, en especial se ha observado una regulaci&oacute;n a la baja en el casete transportador A1 unido a ATP (ABCA1 por sus siglas en ingl&eacute;s) debido a la supresi&oacute;n o inhibici&oacute;n del factor de transcripci&oacute;n nuclear del receptor X alfa del h&iacute;gado (LXR&#945; por sus siglas en ingl&eacute;s), esta inhibici&oacute;n se da tanto a nivel transcripcional y postranscripcional. <SUP>37,38</SUP>Adem&aacute;s de los efectos adversos de las altas concentraciones de &aacute;cidos grasos libres, otros de los mecanismos involucrados en el s&iacute;ndrome de resistencia a la insulina incluyen aquellos relacionados con el gen Rad (ras asociado con diabetes, por sus siglas en ingl&eacute;s), el cual interfiere con funciones celulares esenciales (crecimiento, diferenciaci&oacute;n, transporte vesicular y transducci&oacute;n de señales); PC-1 (una glucoprote&iacute;na de membrana que participa en la resistencia a la insulina) la cual reduce la actividad de la tirosina cinasa inducida por insulina; leptina, que induce la desfosforilaci&oacute;n del sustrato 1 del receptor de insulina, <SUP>5,16</SUP> este sustrato promueve la translocaci&oacute;n de la prote&iacute;na transportadora de glucosa GLUT4, <SUP>12</SUP> factor de crecimiento del hepatocito, increment&aacute;ndose hasta 300% de los valores habituales. <SUP>39</SUP> El factor de crecimiento de los hepatocitos juega un papel importante en la actividad regenerativa del h&iacute;gado, pero sus efectos metab&oacute;licos son interesantes en especial en el metabolismo de los carbohidratos. En estudios realizados con hepatocitos de rata cultivados, el factor de crecimiento del hepatocito inhibe la utilizaci&oacute;n de gluc&oacute;geno estimulada por la insulina, adem&aacute;s de favorecer inhibici&oacute;n en la s&iacute;ntesis de gluc&oacute;geno debido a disminuci&oacute;n en la actividad de gluc&oacute;geno-sintetasa e incremento de la actividad de la gluc&oacute;geno-fosforilasa. <SUP>40</SUP>La sensibilidad a la insulina tambi&eacute;n es regulada por otros mediadores pept&iacute;dicos. El tejido adiposo, especialmente la grasa mesent&eacute;rica en la cual su flujo de sangre venoso se dirige directamente al h&iacute;gado, es una fuente importante de citocinas y hormonas pept&iacute;dicas que regulan a la baja la actividad metab&oacute;lica. Uno de los ejemplos m&aacute;s importantes es el TNF&#945;, el cual se deriva principalmente del tejido adiposo en ausencia de infecciones activas o alteraciones inflamatorias, bajo condiciones normales los niveles de TNF&#945; se correlacionan con la grasa corporal. <SUP>41</SUP> En modelos experimentales de ratones con resistencia a la insulina y NAFLD se observa un estado de inflamaci&oacute;n cr&oacute;nica caracterizado por niveles elevados de TNF&#945;. <SUP>41</SUP>Sin embargo, los pacientes con NAFLD tienen resistencia a la insulina incluso de forma independiente a la presencia de diabetes, obesidad o dislipidemia,    <SUP>42</SUP> lo cual indica que si bien es cierto comparten caracter&iacute;sticas y mecanismos fisiopatol&oacute;gicos similares, existen diferencias intr&iacute;nsecas importantes. <SUP>43</SUP>Todo parece indicar que la inflamaci&oacute;n regula de forma importante la resistencia a la insulina, en especial por la activaci&oacute;n del factor de transcripci&oacute;n nuclear &#954;B, que regula la expresi&oacute;n de citocinas proinflamatorias como el TNF-&#945; e IL-8. Otro dato que apoya la importancia de las citocinas proinflamatorias en la NAFLD es el hecho de que el metronidazol y la polimixina pueden prevenir el desarrollo de NAFLD en pacientes obesos con cirug&iacute;a intestinal de derivaci&oacute;n, <SUP>44</SUP> y que reciben nutrici&oacute;n parenteral, evidenciando el papel de las endotoxinas/citocinas como factor desencadenante de NAFLD. Este dato sugiere que el stress oxidativo y la peroxidaci&oacute;n de l&iacute;pidos pueden ser unos de los factores involucrados en la g&eacute;nesis y progresi&oacute;n de la NAFLD. <SUP>48</SUP>Existen diversos modelos animales para el estudio de la NAFLD, &eacute;stos desarrollan resistencia a la insulina por diversas causas, teniendo esto en consideraci&oacute;n los distintos modelos animales pueden ser modificados (o no) gen&eacute;ticamente, para desarrollar esteatosis, aunque el desenlace final de todos estos modelos es el desarrollo de esteatosis y en mayor o menor magnitud el desarrollo de fibrosis, los mecanismos por los que ocurren no parecen ser iguales en todos los casos, lo cual debe tenerse presente al considerar datos fisiopatol&oacute;gicos o terap&eacute;uticos derivados de &eacute;stos (<a href="/img/revistas/ric/v56n1/n1a11c5.jpg" target="_blank">Cuadro 5</a>).</font></p>     <p align="left"><font size="2" face="Verdana">Durante la historia natural de la esteatohepatitis no alcoh&oacute;lica, se han diferenciado dos momentos determinantes en la evoluci&oacute;n de la NAFLD. La teor&iacute;a de la agresi&oacute;n m&uacute;ltiple postula dos agresiones; (<a href="#fig1">Figura 1</a>) la primera surge a partir del incremento del tejido adiposo que ocasiona una elevaci&oacute;n de los &aacute;cidos grasos libres y la infiltraci&oacute;n grasa del h&iacute;gado (esteatosis), este cambio estructural &quot;sensibiliza&quot; al h&iacute;gado ante el est&iacute;mulo de los metabolitos del estr&eacute;s oxidativo con la consiguiente necrosis e inducci&oacute;n de apoptosis; as&iacute; como un incremento en la expresi&oacute;n del TNF-&#945; que favorece la apoptosis, quimiotaxis y la activaci&oacute;n de las c&eacute;lulas estelares; y de los requerimientos de energ&iacute;a por alteraci&oacute;n funcional y morfol&oacute;gica mitocondrial, lo que ocasiona la transformaci&oacute;n de la esteatosis hacia la esteatohepatitis (segunda agresi&oacute;n). <SUP>26</SUP></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><B>Tratamiento </B> </font></p>     <p align="left"><font size="2" face="Verdana">Considerando los diversos procesos fisiopatol&oacute;gicos involucrados en el desarrollo y progreso de la NAFLD, las modalidades terap&eacute;uticas comparten esta misma diversidad, con distintos resultados. Las estrategias de tratamiento comparten puntos primordiales, principalmente el contrarrestar los efectos del s&iacute;ndrome de resistencia a la insulina, los medios para lograr este objetivo han sido abordados desde diversas disciplinas (<a href="/img/revistas/ric/v56n1/n1a11f2.jpg" target="_blank">Figura 2</a>). Otro elemento a considerar en el tratamiento de la NAFLD es la divergencia de respuesta a tratamiento entre los modelos experimentales, animales y humanos, los cuales no siempre guardan una adecuada concordancia.</font></p>     <p align="left"><font size="2" face="Verdana">El tratamiento de los pacientes con NAFLD t&iacute;picamente se ha enfocado al manejo de las condiciones asociadas tales como obesidad, diabetes mellitus y dislipidemia.</font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>REDUCCI&Oacute;N DE PESO </b></font></p>     ]]></body>
<body><![CDATA[<p align="left"><font size="2" face="Verdana">La reducci&oacute;n de peso ha demostrado mejorar la sensibilidad a la insulina, <SUP>50</SUP> por lo que la NAFLD puede mostrar mejor&iacute;a con un programa de reducci&oacute;n de peso. Existen 14 estudios publicados <SUP>48-61</SUP> donde se demuestran los resultados del control del peso por medio de la dieta. Estos estudios presentan diversas deficiencias metodol&oacute;gicas, lo que limita la posibilidad de afirmar contundentemente los efectos del control diet&eacute;tico en la NAFLD. Hasta este momento, se ha demostrado que el control diet&eacute;tico ha mejorado las variables bioqu&iacute;micas de los pacientes con NAFLD, aunque no en todos los casos se pudo corroborar si esta mejora bioqu&iacute;mica se acompañaba de cambios morfol&oacute;gicos demostrados por biopsia. Los cambios histol&oacute;gicos son m&aacute;s evidentes despu&eacute;s de una disminuci&oacute;n de 11 a 20 kg de peso durante un año, <SUP>49</SUP> es notable que en casos de disminuci&oacute;n de peso de forma abrupta puede existir disminuci&oacute;n del daño morfol&oacute;gico documentado por histolog&iacute;a sin que muestre una mejor&iacute;a en marcadores bioqu&iacute;mico. <SUP>51</SUP> Estos cambios tanto bioqu&iacute;micos como histol&oacute;gicos se consiguen en condiciones controladas en los que el manejo diet&eacute;tico se basa en dietas muy bajas en calor&iacute;as (500 calor&iacute;as/d&iacute;a). Sin embargo, se requiere al menos una disminuci&oacute;n de 10% del peso corporal para conseguir modificaciones en las variables bioqu&iacute;micas. <SUP>54</SUP> Actualmente se considera que una p&eacute;rdida gradual de peso es el primer paso (y unos de los m&aacute;s &uacute;tiles) en el manejo de los pacientes con esteatosis no complicada, <SUP>57,60</SUP> se debe tener especial consideraci&oacute;n en torno a la disminuci&oacute;n gradual de peso, ya que hasta una quinta parte de los pacientes, particularmente aquellos con una reducci&oacute;n de peso pronunciada y acelerada, desarrollan fibrosis o inflamaci&oacute;n portal. <SUP>52</SUP> Esta respuesta parad&oacute;jica puede ser causada por un incremento en los niveles circulantes de &aacute;cidos grasos libres derivados de la movilizaci&oacute;n del tejido adiposo, incrementando sus niveles intrahep&aacute;ticos favoreciendo el stress oxidativo, peroxidaci&oacute;n de l&iacute;pidos e inducci&oacute;n de citocinas; que en conjunto empeoran el daño hep&aacute;tico. <SUP>45</SUP> Por lo anterior, se recomienda que el objetivo inicial del control del peso sea una p&eacute;rdida de 10% en un periodo de seis meses, es decir, una p&eacute;rdida aproximada de 450-900 g por semana. <SUP>61</SUP> En aquellos pacientes con NAFLD pero sin obesidad, se debe hacer mayor &eacute;nfasis en el cambio de los componentes de la dieta y no as&iacute; en la disminuci&oacute;n de la ingesta cal&oacute;rica, adem&aacute;s de favorecer la actividad f&iacute;sica, <SUP>47</SUP> al parecer estos pacientes son candidatos a la terapia farmacol&oacute;gica. <SUP>45</SUP> En el caso de los pacientes con NAFLD, diabetes mellitus y/o dislipidemia, la primera medida terap&eacute;utica es el adecuado control del peso, debido a que el control adecuado de la glucemia y los l&iacute;pidos no siempre se acompaña de mejor&iacute;a en la condici&oacute;n hep&aacute;tica. <SUP>45</SUP></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>OTROS TRATAMIENTOS </b></font></p>     <p align="left"><font size="2" face="Verdana">El uso de agentes sensibilizadores a la acci&oacute;n de la insulina es una de las estrategias que fisiopatol&oacute;gicamente parece ser m&aacute;s eficaz. El uso de tiazolodinedionas en estudios pilotos de un año de duraci&oacute;n muestran resultados positivos con una adecuada tolerancia al tratamiento. Sin embargo, estos resultados deben ser reproducidos en grandes estudios poblacionales, controlados con placebo, con un adecuado seguimiento, para poder determinar su seguridad en pacientes con NAFLD. <SUP>45</SUP> El uso de rosiglitazona ha mostrado disminuci&oacute;n de los niveles de enzimas hep&aacute;ticas, que van de forma paralela a la disminuci&oacute;n de la resistencia a la insulina. <SUP>62</SUP> Otro de los sensibilizadores de la insulina es el metformin, el cual en modelos animales ha ocasionado disminuci&oacute;n de la hepatomegalia y el grado de esteatosis, as&iacute; como normalizaci&oacute;n de los niveles de aminotransferasas, <SUP>63</SUP> resultados similares se han observado en humanos. <SUP>64</SUP>El uso de diversos antioxidantes ha mostrado cierta utilidad en el manejo de la NAFLD, dentro de este grupo de f&aacute;rmacos se incluyen: vitamina E, vitamina C, beta&iacute;na, N-acetilciste&iacute;na y depleci&oacute;n de hierro. <SUP>45</SUP> La vitamina E es un potente antioxidante particularmente efectivo en contra de la peroxidaci&oacute;n de l&iacute;pidos de membrana, y previene la activaci&oacute;n de c&eacute;lulas estelares, <SUP>65</SUP> el uso de dosis entre 400-1,200 UI/d&iacute;a mejora los valores bioqu&iacute;micos de la funci&oacute;n hep&aacute;tica y de marcadores de inflamaci&oacute;n como el factor transformador de crecimiento &#946;1, <SUP>66</SUP> el uso concomitante de vitamina D y vitamina C muestra mejores resultados que el uso de placebo. <SUP>67</SUP>La beta&iacute;na es un componente normal del ciclo metab&oacute;lico de la metionina que incrementa los niveles de S-adenosilmetionina, protegiendo al h&iacute;gado del daño que causan los triglic&eacute;ridos producidos por la ingesta de alcohol. <SUP>68</SUP> Su uso cr&oacute;nico ocasiona una disminuci&oacute;n de los valores de las enzimas hep&aacute;ticas, pero no se ha observado regresi&oacute;n o detenci&oacute;n del daño histol&oacute;gico. <SUP>69</SUP> El uso de N-acetilciste&iacute;na muestra mejor&iacute;as significativa en los valores de aminotransferasas, la N-acetilciste&iacute;na es un precursor del glutation que incrementa los niveles de este compuesto en el hepatocito, lo que limita el daño ocasionado por las especies reactivas de ox&iacute;geno y por ende protege del stress oxidativo. <SUP>70</SUP></font></p>     <p align="left"><font size="2" face="Verdana">El uso de agentes hipolipemiantes (como el clofibrato que disminuye el contenido de triglic&eacute;ridos hep&aacute;ticos que se induce por el consumo de alcohol) ha mostrado resultados contradictorios en los pacientes con NAFLD. <SUP>71,72</SUP></font></p>     <p align="left"><font size="2" face="Verdana">El &aacute;cido ursodesoxic&oacute;lico es un ep&iacute;mero del &aacute;cido quenodesoxic&oacute;lico, debido al reemplazo realizado por los &aacute;cidos biliares end&oacute;genos, posee propiedades hepatoprotectoras, por la disminuci&oacute;n de &aacute;cidos biliares hidrof&oacute;bicos que origina, disminuye la lesi&oacute;n del hepatocito ocasionada por el stress oxidativo en pacientes con NAFLD, tambi&eacute;n se ha demostrado que disminuye la producci&oacute;n de TNF-&#945;. <SUP>56</SUP> El uso de &aacute;cido ursodesoxic&oacute;lico muestra mejor&iacute;a significativa en los niveles de aminotransferasas cuando se utiliza por periodos de al menos 12 meses, <SUP>71</SUP> incluso esta mejor&iacute;a bioqu&iacute;mica sigue siendo importante cuando se compara con pacientes tratados &uacute;nicamente con dieta. <SUP>73</SUP> Recientemente nuestro grupo ha observado una mejor&iacute;a bioqu&iacute;mica y del grado de esteatosis medido por ultrasonido, incluso cuando se compara con pacientes que recibieron manejo diet&eacute;tico a mediano plazo con el uso de &aacute;cido ursodesoxic&oacute;lico. <SUP>58</SUP></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font size="2" face="Verdana"><b>CONCLUSIONES </b></font></p>     <p align="left"><font size="2" face="Verdana">A pesar de los grandes avances que se han realizado en la patogenia de la NAFLD, a&uacute;n quedan m&uacute;ltiples interrogantes por resolver. As&iacute; como en su historia natural. En el futuro, &eacute;stos ser&aacute;n determinantes en el tratamiento y prevenci&oacute;n de esta enfermedad emergente de gran importancia en el momento actual.</font></p>     <p align="left">&nbsp;</p>     ]]></body>
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