<?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>0212-1611</journal-id>
<journal-title><![CDATA[Nutrición Hospitalaria]]></journal-title>
<abbrev-journal-title><![CDATA[Nutr. Hosp.]]></abbrev-journal-title>
<issn>0212-1611</issn>
<publisher>
<publisher-name><![CDATA[Grupo Arán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0212-16112007000200009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Modelos animales de fallo hepético fulminante]]></article-title>
<article-title xml:lang="en"><![CDATA[Animal models of fulminant hepatic failure]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tuñón]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Álvarez]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Culebras]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Gallego]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A04">
<institution><![CDATA[,Ciberehd  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A01">
<institution><![CDATA[,Universidad de León Instituto de Biomedicina ]]></institution>
<addr-line><![CDATA[León ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de León Departamento de Sanidad Animal ]]></institution>
<addr-line><![CDATA[León ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Sacyl Complejo Asistencial de León ]]></institution>
<addr-line><![CDATA[León ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2007</year>
</pub-date>
<volume>22</volume>
<numero>2</numero>
<fpage>199</fpage>
<lpage>209</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S0212-16112007000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S0212-16112007000200009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S0212-16112007000200009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El fallo hepático fulminante (FHF) es un síndrome clínico muy grave, asociado con alta mortalidad, a pesar de los grandes avances que se han producido en los últimos años en la terapia tanto del manejo de los cuidados intensivos mediante diversos soportes hepáticos bioartificiales como del trasplante hepático. Tanto el conocimiento como el tratamiento del FHF han estado limitados por la falta de modelos animales satisfactorios. Así, han sido muchos los intentos de desarrollar un modelo adecuado, entre los que se incluyen los modelos quirúrgicos, tales como la hepatectomía y desvascularización total y/o parcial, la utilización de sustancias químicas con toxicidad hepática tales como el acetaminofeno, azoximetano, galactosamina, tioacetamida, entre otras. Ahora bien, la mayor parte de estos modelos no reflejan de modo idóneo el patrón de la enfermedad humana de FHF y todos ellos presentan importantes limitaciones. A pesar de que la hepatitis vírica es una de las etiologías más frecuentes de FHF, el uso de agentes víricos para desarrollar modelos animales ha sido escaso y desafortunado. Nuestro grupo ha desarrollado recientemente un modelo animal mediante la inoculación de conejos con el virus de la enfermedad hemorrágica del conejo que presenta características bioquímicas, histológicas y signos clínicos compatibles con el FHF del hombre. En el trabajo se resumen los modelos animales más utilizados asi como las ventajas e inconvenientes más reseñables de cada uno de ellos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Fulminant hepatic failure (FHF) is a very serious clinical síndrome that, in spite of the important therapeutical advances that have taken place in the last years by means of bioartifical hepatic support devices and hepatic transplantation, is still associated to a high mortality. Knowledge and treatment of the FHF have been limited by the lack of satisfactory animal models. Among the attempts to develop a suitable model are surgical models, such as hepatectomy and total and/or partial devascularization, or the use of chemical substances with hepatic toxicity, such as acetaminophen, azoximethane, galactosamine or thioacetamide, among others. However, most of these models do not adequatly reflect the pattern of the human disease and all of them present important limitations. Although viral hepatitis is one of the most frequent causes of FHF, the use of viral agents to develop animal models has been little and unfortunate. Our group has recently developed a viral animal model of FHF by means of the inoculation of rabbits with the virus of the rabbit hemorrhagic disease. This model displays biochemical, and histological characteristics, and clinical signs that ressemble those in human FHF. In the present article, the most widely used animal models of FHF, together with their main advantages and disadvantages, are presented.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fallo hepático fulminante]]></kwd>
<kwd lng="es"><![CDATA[Modelos quirúrgicos]]></kwd>
<kwd lng="es"><![CDATA[Modelos químicos]]></kwd>
<kwd lng="es"><![CDATA[Modelos víricos]]></kwd>
<kwd lng="en"><![CDATA[Fulminant hepatic failure]]></kwd>
<kwd lng="en"><![CDATA[Surgical models]]></kwd>
<kwd lng="en"><![CDATA[Chemical models]]></kwd>
<kwd lng="en"><![CDATA[Viral models]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font face="Verdana" size="2"><b><a name="top"></a>REVISIÓN</b></font></p>     <p align="right">&nbsp;</p>     <p align="left"><font face="Verdana" size="4"><b>Modelos animales de fallo hepético fulminante</b></font></p>     <p><font face="Verdana" size="4"><B>Animal models of fulminant hepatic failure</B></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><B>M. J. Tu&ntilde;&oacute;n*, M. &Aacute;lvarez**, J. M. Culebras*** y J. Gonz&aacute;lez-Gallego*</B></font></p>     <p><font face="Verdana" size="2">*Ciberehd e Instituto de Biomedicina. Universidad de Le&oacute;n. **Departamento de Sanidad Animal. Universidad de Le&oacute;n. ***Complejo Asistencial de Le&oacute;n. Sacyl. Le&oacute;n. Espa&ntilde;a.</font></p>     <p><font face="Verdana" size="2">Este trabajo ha sido subvencionado en parte por los proyectos de investigaci&oacute;n concedidos por el FIS (Ref. PI021121) y la Junta de Castilla y Le&oacute;n (Ref. LE61/03 y LE04/04).</font></p>     <p><font face="Verdana" size="2"><a href="#back">Dirección para correspondencia</a></font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1">     <p><font face="Verdana" size="2"><b>RESUMEN</b></font></p>     <p><font face="Verdana" size="2">El fallo hep&aacute;tico fulminante (FHF) es un s&iacute;ndrome cl&iacute;nico muy grave, asociado con alta mortalidad, a pesar de los grandes avances que se han producido en los &uacute;ltimos a&ntilde;os en la terapia tanto del manejo de los cuidados intensivos mediante diversos soportes hep&aacute;ticos bioartificiales como del trasplante hep&aacute;tico. Tanto el conocimiento como el tratamiento del FHF han estado limitados por la falta de modelos animales satisfactorios. As&iacute;, han sido muchos los intentos de desarrollar un modelo adecuado, entre los que se incluyen los modelos quir&uacute;rgicos, tales como la hepatectom&iacute;a y desvascularizaci&oacute;n total y/o parcial, la utilizaci&oacute;n de sustancias qu&iacute;micas con toxicidad hep&aacute;tica tales como el acetaminofeno, azoximetano, galactosamina, tioacetamida, entre otras. Ahora bien, la mayor parte de estos modelos no reflejan de modo id&oacute;neo el patr&oacute;n de la enfermedad humana de FHF y todos ellos presentan importantes limitaciones. A pesar de que la hepatitis v&iacute;rica es una de las etiolog&iacute;as m&aacute;s frecuentes de FHF, el uso de agentes v&iacute;ricos para desarrollar modelos animales ha sido escaso y desafortunado. Nuestro grupo ha desarrollado recientemente un modelo animal mediante la inoculaci&oacute;n de conejos con el virus de la enfermedad hemorr&aacute;gica del conejo que presenta caracter&iacute;sticas bioqu&iacute;micas, histol&oacute;gicas y signos cl&iacute;nicos compatibles con el FHF del hombre. En el trabajo se resumen los modelos animales m&aacute;s utilizados asi como las ventajas e inconvenientes m&aacute;s rese&ntilde;ables de cada uno de ellos.</font></p>     <p><font face="Verdana" size="2"><B>Palabras clave:</B> Fallo hep&aacute;tico fulminante. Modelos quir&uacute;rgicos. Modelos qu&iacute;micos. Modelos v&iacute;ricos.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><B>ABSTRACT</B></font></p>     <p><font face="Verdana" size="2">Fulminant hepatic failure (FHF) is a very serious clinical s&iacute;ndrome that, in spite of the important therapeutical advances that have taken place in the last years by means of bioartifical hepatic support devices and hepatic transplantation, is still associated to a high mortality. Knowledge and treatment of the FHF have been limited by the lack of satisfactory animal models. Among the attempts to develop a suitable model are surgical models, such as hepatectomy and total and/or partial devascularization, or the use of chemical substances with hepatic toxicity, such as acetaminophen, azoximethane, galactosamine or thioacetamide, among others. However, most of these models do not adequatly reflect the pattern of the human disease and all of them present important limitations. Although viral hepatitis is one of the most frequent causes of FHF, the use of viral agents to develop animal models has been little and unfortunate. Our group has recently developed a viral animal model of FHF by means of the inoculation of rabbits with the virus of the rabbit hemorrhagic disease. This model displays biochemical, and histological characteristics, and clinical signs that ressemble those in human FHF. In the present article, the most widely used animal models of FHF, together with their main advantages and disadvantages, are presented.</font></p>     <p><font face="Verdana" size="2"><B>Key words:</B> Fulminant hepatic failure. Surgical models. Chemical models. Viral models.</font></p> <hr size="1">     <p>&nbsp;</p>     <p><font face="Verdana"><B>Introducci&oacute;n</B></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">El fallo hep&aacute;tico fulminante (FHF) es un s&iacute;ndrome cl&iacute;nico muy grave asociado con una alta mortalidad<sup>1</sup> a pesar de los grandes avances que se han producido en los campos tanto del manejo de los cuidados intensivos como del trasplante hep&aacute;tico<sup>2,3</sup>. Desde que en 1970 Trey y Davidson<sup>4</sup> propusieron una definici&oacute;n del FHF, algunos autores han aportado distintas clasificaciones con el objetivo de establecer un pron&oacute;stico y una acci&oacute;n terap&eacute;utica en cada caso bas&aacute;ndose fundamentalmente en la duraci&oacute;n del periodo de tiempo transcurrido entre el inicio de los s&iacute;ntomas cl&iacute;nicos o la aparici&oacute;n de ictericia y el desarrollo de encefalopat&iacute;a. As&iacute;, en el King&rsquo;s College Hospital de Londres, O&rsquo;Grady y Williams<sup>5</sup> propusieron tres categor&iacute;as: fallo hep&aacute;tico hiperagudo, agudo y subagudo, mientras que, en el Hospital Beaujou de Par&iacute;s se clasific&oacute; en fallo hep&aacute;tico fulminante, cuando la encefalopat&iacute;a se desarrolla dentro de las dos semanas de iniciada la ictericia, y en fallo hep&aacute;tico subfulminante cuando se desarrolla entre las dos y doce semanas<sup>6,7</sup>. Estos criterios siguen utiliz&aacute;ndose en la actualidad en cl&iacute;nicas de reconocido prestigio<sup>8</sup>.</font></p>     <p><font face="Verdana" size="2">El FHF se caracteriza por un r&aacute;pido deterioro de la funci&oacute;n hep&aacute;tica con desarrollo de encefalopat&iacute;a hep&aacute;tica en pacientes sin historia previa de enfermedad hep&aacute;tica o con alteraciones hep&aacute;ticas cr&oacute;nicas<sup>9</sup> que produce un desequilibrio en el que se ven involucradas una gran cantidad de se&ntilde;ales de citocinas y de muerte celular en el contexto del da&ntilde;o hepacelular<sup>10</sup>. La etiolog&iacute;a del FHF es muy diversa e incluye: hepatitis v&iacute;ricas, hepatotoxinas, lesiones vasculares, hepatitis autoinmune, alteraciones metab&oacute;licas y deformidades anat&oacute;micas hep&aacute;ticas, si bien, en una gran proporci&oacute;n de pacientes es desconocida. En un estudio sobre su etiolog&iacute;a realizado en Espa&ntilde;a durante un per&iacute;odo de 6 a&ntilde;os (1992-1998), se indic&oacute; que los principales agentes etiopatog&eacute;nicos del s&iacute;ndrome eran: hepatitis v&iacute;ricas (39%), causa desconocida (30%), t&oacute;xicos o f&aacute;rmacos (21%) y otros (10%). El estudio puso de relieve que el 15% de los pacientes se recuper&oacute; con las medidas convencionales, el 56% precis&oacute; trasplante hep&aacute;tico urgente y el 29% muri&oacute; antes del trasplante<sup>11</sup>.</font></p>     <p><font face="Verdana" size="2">La hepatitis v&iacute;rica aguda constituye una causa frecuente de FHF<sup>6,12,13</sup>. Los virus causantes de las hepatitis A, B, D y E son capaces de desencadenar FHF. El virus de la hepatitis B es la principal causa a escala mundial, llegando a ser responsable del 70% de los casos de origen v&iacute;rico<sup>14</sup>. El virus de la hepatitis E provoca FHF sobre todo en mujeres en el tercer trimestre de embarazo con gran incidencia en diferentes zonas de Africa y Asia<sup>15</sup>. Otros virus implicados son: herpes simple, varicela-zoster, citomegalovirus, virus de Epstein-Barr, herpes humano tipo 6, adenovirus y paramixovirus, principalmente en estados de inmunosupresi&oacute;n<sup>16</sup>.</font></p>     <p><font face="Verdana" size="2">Los anti-inflamatorios no esteroideos, analg&eacute;sicos y antibacterianos se encuentran entre los f&aacute;rmacos que con mayor frecuencia pueden desencadenar FHF<sup>6,17,18</sup>. En la actualidad, se considera que el paracetamol, los antirretrovirales y los f&aacute;rmacos anti-tuberculosos son los principales implicados en ocasionar da&ntilde;o hep&aacute;tico agudo; de hecho, aunque la incidencia de FHF de etiolog&iacute;a farmacol&oacute;gica sigue siendo baja, se ha observado en Espa&ntilde;a y en Suecia que la ictericia hepatocelular aguda inducida por f&aacute;rmacos se asocia con la muerte o con la necesidad de un trasplante en al menos un 10% de los casos<sup>19,20</sup>.</font></p>     <p><font face="Verdana" size="2">Existen otras causas poco frecuentes de FHF como las asociadas al embarazo (ruptura hep&aacute;tica espont&aacute;nea), enfermedad veno-oclusiva, s&iacute;ndrome de Budd-Chiari, enfermedad de Wilson, hemocromatosis, met&aacute;stasis tumorales, sepsis, isquemia y fracaso de trasplante hep&aacute;tico<sup>21,22</sup>.</font></p>     <p><font face="Verdana" size="2">El FHF es un s&iacute;ndrome que se produce como consecuencia del fallo funcional de una gran parte del par&eacute;nquima hep&aacute;tico y cuya gravedad es proporcional al grado de da&ntilde;o hep&aacute;tico. El FHF causa profundas alteraciones fisiol&oacute;gicas caracterizadas por encefalopat&iacute;a, trastornos hemodin&aacute;micos y coagulopat&iacute;a con desarrollo frecuente de edema cerebral y fallo renal<sup>16,23,24</sup>. Su diagn&oacute;stico se basa en datos bioqu&iacute;micos y hematol&oacute;gicos que evidencian la hipofunci&oacute;n celular hep&aacute;tica. La investigaci&oacute;n sobre los mejores &iacute;ndices predictivos es un campo en continuo desarrollo<sup>25</sup>. En este sentido, se considera un buen &iacute;ndice predictivo el alargamiento del tiempo de protrombina que no se corrige con vitamina K y la disminuci&oacute;n del factor V<sup>26</sup>. Finalmente, uno de los campos que reciben mayor inter&eacute;s es el estudio de todos los factores que influyen en la apoptosis y la regeneraci&oacute;n hep&aacute;tica en este complejo s&iacute;ndrome<sup>27</sup>.</font></p>     <p><font face="Verdana" size="2">La fisiopatolog&iacute;a de todas estas alteraciones es un&aacute;rea de enorme inter&eacute;s. Parece obvia la existencia de una interrelaci&oacute;n entre distintos mecanismos patog&eacute;nicos que desencadenan los desequilibrios circulatorios. De hecho, la interacci&oacute;n entre el endotelio, el m&uacute;sculo vascular, las toxinas bacterianas, las citocinas, los radicales libres y otros componentes de la cascada de la respuesta inflamatoria provoca la p&eacute;rdida del control vascular y la lesi&oacute;n local con p&eacute;rdida de la integridad endotelial y las alteraciones en el flujo sangu&iacute;neo de la microcirculaci&oacute;n<sup>28</sup>. El endotelio parece ser el primero en liberar agentes vasoactivos que afectar&iacute;an al modelo de flujo sangu&iacute;neo local y distal en la fase cr&iacute;tica de la enfermedad, siendo componentes esenciales el NO, las prostaciclinas y las endotelinas.</font></p>     <p><font face="Verdana" size="2">Las manifestaciones cl&iacute;nicas y los an&aacute;lisis laboratoriales son comunes en el FHF de diferentes etiolog&iacute;as, salvo peculiaridades espec&iacute;ficas. La encefalopat&iacute;a hep&aacute;tica constituye un criterio diagn&oacute;stico y se debe probablemente a la acumulaci&oacute;n de amonio y mercaptanos, alteraciones en las v&iacute;as glutamaton&eacute;rgicas, serotonin&eacute;rgicas y noradren&eacute;rgicas, producci&oacute;n de neurotransmisores falsos, activaci&oacute;n de receptores centrales del &aacute;cido gamma-aminobut&iacute;rico/benzodiazepina y la alteraci&oacute;n del metabolismo energ&eacute;tico<sup>29-31</sup>. La hiperbilirrubinemia es casi siempre de tipo conjugado y la ictericia es un signo precoz y r&aacute;pidamente progresivo. Se producen graves trastornos de la coagulaci&oacute;n por diferentes mecanismos. El consumo del factor V refleja un da&ntilde;o hep&aacute;tico independientemente de los niveles de vitamina K. La insuficiencia renal aparece en el 30-75% de los casos y se asocia a un peor pron&oacute;stico. Tambi&eacute;n es frecuente la trombocitopenia<sup>32</sup>.</font></p>     <p><font face="Verdana" size="2">El aumento de las concentraciones plasm&aacute;ticas de amino&aacute;cidos arom&aacute;ticos (AAA) y los valores normales o ligeramente aumentados de los amino&aacute;cidos de cadena ramificada (ACR) son hallazgos t&iacute;picos en los pacientes con FHF<sup>30</sup>; de hecho un par&aacute;metro cl&iacute;nico fundamental en el FHF es el &iacute;ndice de Fischer, es decir, la relaci&oacute;n molar entre los ACR/AAA, que disminuye con el incremento de gravedad de la alteraci&oacute;n hep&aacute;tica<sup>33</sup>. As&iacute; se ha descrito en diversos modelos animales, tanto quir&uacute;rgicos<sup>34</sup> como utilizando galactosamina<sup>35</sup>, un aumento significativo de los amino&aacute;cidos fenilalanina y tirosina y una disminuci&oacute;n del &iacute;ndice de Fischer.</font></p>     <p><font face="Verdana" size="2">El estudio de la patog&eacute;nesis del fallo multiorg&aacute;nico en el FHF y en particular los mecanismos moleculares de regeneraci&oacute;n hep&aacute;tica son investigaciones que gozan de un enorme inter&eacute;s<sup>36</sup>. En animales de experimentaci&oacute;n con hepatectom&iacute;a parcial se han estudiado los mecanismos de regeneraci&oacute;n hep&aacute;tica, desde la activaci&oacute;n de factores de transcripci&oacute;n hasta la entrada y progresi&oacute;n de los hepatocitos v&iacute;a el ciclo celular con la eventual s&iacute;ntesis de ADN y divisi&oacute;n celular<sup>37</sup>. Aunque se sabe poco acerca del proceso regenerativo hep&aacute;tico en el FHF, es obvio que hay un variable, aunque marcado, grado de p&eacute;rdida y da&ntilde;o celular en el  h&iacute;gado junto con una ausencia de actividad regeneradora<sup>38</sup>. Los niveles plasm&aacute;ticos del factor de crecimiento de los hepatocitos (HGF) y del factor de crecimiento transformador beta (TGF-&beta;) se elevan. As&iacute;, el nivel del HGF es inversamente proporcional a la prognosis<sup>39</sup>. Tambi&eacute;n es evidente un incremento en la actividad del sistema fibrinol&iacute;tico que es responsable de la activaci&oacute;n tanto del HGF como del TGF-&beta;<sup>40</sup>. Se ha indicado que el suero de personas afectadas de FHF tiene un efecto negativo sobre el crecimiento de c&eacute;lulas en cultivo comparado con el suero control debido a la inhibici&oacute;n de la proliferaci&oacute;n celular y no a un aumento de la necrosis y/o de la apoptosis celular<sup>41</sup>. Recientemente, se ha demostrado, en diversos modelos animales de FHF, que la sobreexpresi&oacute;n de calpastatina, un inhibidor end&oacute;geno de la calpa&iacute;na, evita la progresi&oacute;n del da&ntilde;o hep&aacute;tico cuando la regeneraci&oacute;n hep&aacute;tica est&aacute; comprometida<sup>42</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En resumen, nuestro conocimiento de las bases patofisiol&oacute;gicas del s&iacute;ndrome neurol&oacute;gico del FHF ha avanzado considerablemente y se est&aacute;n utilizando nuevas terapias para reducir el amonio y su captaci&oacute;n cerebral, alterar el metabolismo del glutamato y posiblemente utilizar una terapia frente a las citocinas proinflamatorias. Sin embargo, nuestro conocimiento sobre las bases patofisiol&oacute;gicas de la alteraci&oacute;n hemodin&aacute;mica, la disfunci&oacute;n inmunol&oacute;gica y el fallo multiorg&aacute;nico se encuentra en un estado muy rudimentario por lo que es fundamental una profundizaci&oacute;n de sus bases moleculares<sup>43</sup>. Por otro lado, aunque en los&uacute;ltimos a&ntilde;os se han propuesto y aplicado una gran cantidad de opciones terap&eacute;uticas para el FHF, solamente el trasplante hep&aacute;tico ha sido ampliamente aceptado por los especialistas cl&iacute;nicos, pero no siempre resulta posible por la falta de donantes, su elevado coste, la dificultad t&eacute;cnica, viabilidad y la desventaja de requerir tratamiento farmacol&oacute;gico inmunosupresor durante toda la vida, con la dificultad a&ntilde;adida de que los inmunosupresores utilizados actualmente producen efectos secundarios adversos en ri&ntilde;&oacute;n, h&iacute;gado y otros &oacute;rganos<sup>38</sup>. Los m&eacute;todos de soporte artificial tales como la destoxificaci&oacute;n extracorp&oacute;rea a trav&eacute;s de sistemas  de recirculaci&oacute;n por absorbentes (MARS)<sup>44</sup> y las terapias basadas en c&eacute;lulas reciben cada vez m&aacute;s atenci&oacute;n<sup>25,45,46</sup>pero a&uacute;n son t&eacute;cnicas que requieren demostrar de forma fehaciente su eficacia y viabilidad<sup>47</sup>. En t&eacute;rminos de aplicaci&oacute;n cl&iacute;nica son absolutamente necesarios estudios funcionales en modelos animales<sup>2</sup>.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Modelos animales de fallo hep&aacute;tico fulminante (FHF)</b></font></p>     <p><font face="Verdana" size="2">Existen pocas condiciones en medicina que sean m&aacute;s graves y desalentadoras que el FHF. Tanto el conocimiento como el tratamiento de este s&iacute;ndrome han estado limitados por la falta de modelos animales satisfactorios. As&iacute; han sido muchos los intentos de desarrollar un modelo adecuado y reproducible utilizando una gran variedad de especies y de modalidades, desde los modelos inducidos por manipulaci&oacute;n quir&uacute;rgica, entre los que se incluyen la isquemia hep&aacute;tica la hepatectom&iacute;a completa y la utilizaci&oacute;n de sustancias hepatot&oacute;xicas tales como acetaminofeno, azoximetano, concanavalina A, sulfoximina butionina, galactosamina y amatoxina-endotoxina, entre otras. Sin embargo, hasta el momento actual no se ha descrito un modelo sencillo que refleje de modo id&oacute;neo el patr&oacute;n de la enfermedad humana de FHF y los que se utilizan presentan importantes limitaciones<sup>48,49</sup>.</font></p>     <p><font face="Verdana" size="2">El modelo ideal deber&iacute;a presentar criterios cl&iacute;nicos y bioqu&iacute;micos bien definidos que, como los criterios pron&oacute;sticos del <i>King College</i> para el FHF<sup>12</sup>, sean capaces de lograr una estimaci&oacute;n acertada de prognosis. Sin embargo, ninguno de los modelos desarrollados hasta ahora cumple estas premisas. Adem&aacute;s, los criterios cl&iacute;nicos y bioqu&iacute;micos utilizados para indicar la existencia de FHF en modelos animales a menudo tienen poco parecido con los usados en la pr&aacute;ctica cl&iacute;nica. As&iacute;, por ejemplo, la estimaci&oacute;n de la presi&oacute;n intracraneal en modelos animales se suele realizar indirectamente mediante la medida del amonio o el electroencefalograma. A pesar de todo ello, y dado el estado de conocimiento del FHF y las dificultades que supone la investigaci&oacute;n en pacientes, los modelos animales tienen un papel fundamental en los estudios futuros. Por tanto, aunque se est&aacute;n realizando progresos, la b&uacute;squeda debe continuar en este campo con objeto de obtener un modelo animal potente, id&oacute;neo, con las m&iacute;nimas desventajas y que sea capaz de reflejar con precisi&oacute;n el s&iacute;ndrome cl&iacute;nico de humanos<sup>27,41</sup>.</font></p>     <p><font face="Verdana" size="2">Un modelo ideal de FHF, seg&uacute;n criterios ampliamente reconocidos por la comunidad cient&iacute;fica (<a href="#t1">tabla I</a>)<sup>50</sup>, deber&iacute;a cumplir una serie de requerimientos entre los que se incluyen: que el modelo pueda ser reversible en el sentido de que algunos animales puedan sobrevivir al proceso si se utiliza un tratamiento adecuado; los resultados obtenidos deben ser reproducibles, esto es, conducir a la muerte en un intervalo de tiempo determinado y que la extensi&oacute;n del da&ntilde;o hep&aacute;tico pueda ser medible y estandarizable. Adem&aacute;s, la muerte debe producirse por fallo hep&aacute;tico, es decir, los acontecimientos producidos tras el da&ntilde;o tienen que reflejar el patr&oacute;n cl&iacute;nico t&iacute;pico del hombre y la muerte debe ser el resultado directo del da&ntilde;o producido al h&iacute;gado; por consiguiente, los animales no tratados deber&iacute;an morir con signos de fallo hep&aacute;tico progresivo en un per&iacute;odo de tiempo conocido. Adem&aacute;s, el animal debe ser de un tama&ntilde;o suficiente como para permitir una adecuada toma seriada de muestras sangu&iacute;neas y de diversos tejidos mientras se llevan a cabo los tratamientos adecuados. Y, finalmente, todos los m&eacute;todos utilizados deben presentar el menor riesgo para las personas involucradas en los estudios.</font></p>     <p align="center"><font face="Verdana" size="2"><a name="t1"><img src="/img/revistas/nh/v22n2/revision7_t1.gif"></a></font></p>     <p><font face="Verdana" size="2">Aunque, la mayor&iacute;a de los casos de FHF son de etiolog&iacute;a v&iacute;rica, la mayor parte de los modelos animales se basan en t&eacute;cnicas quir&uacute;rgicas o en da&ntilde;o producido por diversas sustancias qu&iacute;micas (<a target="_blank" href="/img/revistas/nh/v22n2/revision7_t2.gif">tabla II</a>). As&iacute;, se han llevado a cabo numerosos estudios con el fin de lograr modelos aplicables de FHF, unos denominados"modelos quir&uacute;rgicos" incluyen la utilizaci&oacute;n de isquemia hep&aacute;tica y hepatectom&iacute;a parcial y/o total, y los denominados "modelos qu&iacute;micos" que se basan en la utilizaci&oacute;n de diversas drogas, toxinas y venenos tales como acetaminofeno, azoximetano, concanavalina A, butionesulfoximina, galactosamina, halotano, tioacetamida, amatoxina-endotoxina, etc. sin que hasta el momento ning&uacute;n modelo refleje de manera apropiada el patr&oacute;n humano de FHF y con frecuencia posean limitaciones muy significativas.</font></p>     <p><font face="Verdana" size="2"><i>Modelos quir&uacute;rgicos</i></font></p>     <p><font face="Verdana" size="2">Los modelos quir&uacute;rgicos de FHF pueden ser catalogados en tres categor&iacute;as: la hepatectom&iacute;a (total o parcial), la desvascularizaci&oacute;n (total o parcial) y aquellos que resultan de la combinaci&oacute;n de los dos anteriores.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Hepatectom&iacute;a total y parcial</font></p>     <p><font face="Verdana" size="2">Los modelos quir&uacute;rgicos de eliminaci&oacute;n total y/o parcial del h&iacute;gado se han desarrollado con &eacute;xito en diversas especies animales despu&eacute;s del primer intento realizado en perros por Mann en 1921<sup>51</sup>. En cerdos se describi&oacute; un modelo, potencialmente reversible, que combina la hepatectom&iacute;a parcial (70%) con la derivaci&oacute;n portocava y produce la muerte por FHF despu&eacute;s de un per&iacute;odo de tiempo suficientemente largo como para permitir estudios sobre soportes hep&aacute;ticos; el animal es de tama&ntilde;o adecuado y la t&eacute;cnica no presenta peligro<sup>52</sup>.</font></p>     <p><font face="Verdana" size="2">Se ha podido establecer en ratas que una resecci&oacute;n del 95% del h&iacute;gado es un buen modelo de FHF<sup>53</sup>, mientras que en ratones una hepatectom&iacute;a de menos del 90% es el l&iacute;mite de seguridad como modelo de estudio de regeneraci&oacute;n hep&aacute;tica ya que por encima de dicho valor se encuentra en un nivel de fallo hep&aacute;tico mortal<sup>54</sup>.</font></p>     <p><font face="Verdana" size="2">La hepatectom&iacute;a total del h&iacute;gado presenta los inconvenientes de la ausencia de productos de la necrosis hep&aacute;tica y transmisores de se&ntilde;ales tan fundamentales en el mecanismo patog&eacute;nico del fallo hep&aacute;tico. Por otro lado sus ventajas se limitan a la reproductibilidad y a su utilidad para el estudio de diversos soportes artificiales  <i>in vivo</i> en ausencia de los productos t&oacute;xicos eliminados o producidos por el h&iacute;gado da&ntilde;ado. A pesar de los inconvenientes rese&ntilde;ados la hepatectom&iacute;a total se ha utilizado en ratas para estudios de regeneraci&oacute;n hep&aacute;tica<sup>55</sup> y en cerdos como modelo reproducible para comprobar la eficacia y funci&oacute;n de diversos sistemas temporales de soporte hep&aacute;tico<sup>56</sup>.</font></p>     <p><font face="Verdana" size="2">Se ha podido demostrar en ratas sometidas a diversos grados de hepatectom&iacute;a parcial, mediante an&aacute;lisis de ADN, que el FHF inducido es consecuencia tanto del incremento en la apoptosis como de la disminuci&oacute;n de la regeneraci&oacute;n hep&aacute;tica<sup>57</sup>.</font></p>     <p><font face="Verdana" size="2">En los &uacute;ltimos a&ntilde;os se han realizado diversos avances sobre las t&eacute;cnicas originales, como la utilizaci&oacute;n de diversas modalidades de pr&oacute;tesis<sup>58</sup> o el trasplante intraperitoneal de c&eacute;lulas de la m&eacute;dula &oacute;sea bioencapsuladas en ratas con un 90% de hepatectom&iacute;a<sup>59</sup>.</font></p>     <p><font face="Verdana" size="2">Desvascularizaci&oacute;n</font></p>     <p><font face="Verdana" size="2">La desvascularizaci&oacute;n completa del h&iacute;gado se ha utilizado con &eacute;xito para inducir un fallo hep&aacute;tico reproducible en cerdos que pueda ser utilizable para el estudio de diversos sistemas de soportes hep&aacute;ticos artificiales y/o bioartificiales<sup>60-62</sup> o para la constataci&oacute;n del efecto de sustancias antioxidantes tales como la Nacetilciste&iacute;na<sup>63</sup>. As&iacute;, por ejemplo se desarroll&oacute; un modelo reproducible en minicerdos por la desvascularizaci&oacute;n reversible mediante ligadura de la arteria hep&aacute;tica y anastomosis portocava en el que se monitoriz&oacute; la presi&oacute;n intracraneal adem&aacute;s de otros par&aacute;metros cl&aacute;sicos indicativos de FHF. Este modelo presenta una ventana terap&eacute;utica de unas 8 horas lo que podr&iacute;a permitir la realizaci&oacute;n pruebas con diversos soportes de h&iacute;gado bioartificiales<sup>64</sup>.</font></p>     <p><font face="Verdana" size="2">Para comprobar la eficacia de diversos sistemas de soporte tanto bioartificiales como artificiales se utilizan con frecuencia modelos animales de mayor tama&ntilde;o como el cerdo al que se le induce un fallo hep&aacute;tico mediante la isquemia del &oacute;rgano por derivaci&oacute;n portocava y ligadura de la arteria hep&aacute;tica<sup>65</sup> o mediante desvascularizaci&oacute;n total<sup>60</sup>.</font></p>     <p><font face="Verdana" size="2">En un modelo realizado en perros mediante el pinzamiento total de la tr&iacute;ada portal se comprob&oacute; que el da&ntilde;o producido por la isquemia-reperfusi&oacute;n ocasionado por el procedimiento quir&uacute;rgico era menor tras la administraci&oacute;n de un antagonista del receptor B<sub>2</sub> de la bradiquinina<sup>66</sup>. Tambi&eacute;n se ha utilizado un modelo de FHF en perros mediante una derivaci&oacute;n portocava combinada con ligadura del conducto biliar para comprobar un nuevo sistema de h&iacute;gado bioartificial mediante la inoculaci&oacute;n de hepatocitos porcinos en biorreactores<sup>67</sup>. Recientemente, se ha desarrollado un modelo porcino en el que se combina una resecci&oacute;n del 75-80% del h&iacute;gado despu&eacute;s de un periodo de isquemia<sup>68</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En estudios realizados sobre el tiempo de supervivencia, la facilidad t&eacute;cnica, seguridad y reproductibilidad de los dos principales tipos de modelos quir&uacute;rgicos de FHF, se puso de manifiesto que la desvascularizaci&oacute;n parece m&aacute;s &uacute;til para estudiar el desarrollo y tratamiento del FHF causado por la isquemia y sus efectos secundarios, mientras que la hepatectom&iacute;a parcial parece superior en la investigaci&oacute;n del estatus de la falta del h&iacute;gado y el tratamiento del FHF mediante sistemas de soportes hep&aacute;ticos bioartificiales<sup>69</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Modelos inducidos por sustancias qu&iacute;micas</i></font></p>     <p><font face="Verdana" size="2">El uso de agentes qu&iacute;micos tales como el acetaminofeno/sulfoxinina butionina o galactosamina aunque en algunos casos pueden reproducir un n&uacute;mero de importantes caracter&iacute;sticas cl&iacute;nicas tales como la hipoglucemia, encefalopat&iacute;a y aumento de enzimas hep&aacute;ticos, requieren la administraci&oacute;n repetida, una monitorizaci&oacute;n estrecha de sus concentraciones o una terapia de soporte y existen un gran n&uacute;mero de factores que pueden causar variabilidad entre distintos experimentos. Adem&aacute;s, la constataci&oacute;n de hipertensi&oacute;n intracraneal, una de las caracter&iacute;sticas principales del FHF en el hombre, no siempre se produce y, en otros casos, tampoco se ha demostrado el aumento de las toxinas implicadas en la encefalopat&iacute;a hep&aacute;tica y el edema cerebral del FHF del hombre. A pesar de ello el uso de sustancias qu&iacute;micas hepatot&oacute;xicas se ha utilizado y se utiliza con frecuencia como modelo de FHF.</font></p>     <p><font face="Verdana" size="2">Acetaminofeno</font></p>     <p><font face="Verdana" size="2">El acetaminofeno (paracetamol) es un f&aacute;rmaco de uso com&uacute;n que puede causar da&ntilde;o hep&aacute;tico; de hecho, es el agente utilizado con mayor frecuencia para el suicidio en el Reino Unido, a pesar de la existencia de un ant&iacute;doto, la acetilciste&iacute;na. La toxicidad del acetaminofeno es dosis-dependiente, pero su efecto puede ser exacerbado por el ayuno, f&aacute;rmacos inductores del sistema citocromo P-450 y de forma especial por el alcohol. Recientemente, se ha indicado, tanto en cultivos de hepatocitos como en ratones, que la v&iacute;a de las c-jun quinasas terminales (JNK) juegan un papel fundamental en el efecto t&oacute;xico del f&aacute;rmaco<sup>70</sup>.</font></p>     <p><font face="Verdana" size="2">Los resultados de numerosos estudios en modelos animales en los que se utiliza el acetaminofeno para inducir fallo hep&aacute;tico agudo reflejan resultados no muy homog&eacute;neos debido a la existencia de importantes variaciones en el metabolismo hep&aacute;tico de destoxificaci&oacute;n del f&aacute;rmaco relacionadas con la especie y con la edad<sup>71,72</sup>. El metabolismo de biotransformaci&oacute;n hep&aacute;tica del acetaminofeno se produce en condiciones normales por reacciones de glucuronizaci&oacute;n y sulfataci&oacute;n para ser despu&eacute;s eliminado por la v&iacute;a renal. Cuando el f&aacute;rmaco se encuentra en exceso, se saturan las v&iacute;as normales de destoxificaci&oacute;n y es metabolizado por el sistema enzim&aacute;tico del citocromo P-450 a Nacetil-p-benzoquinoneimina que, a no ser que se conjuge con el trip&eacute;ptido glutati&oacute;n, es capaz de inferir da&ntilde;o hep&aacute;tico mediante la inhibici&oacute;n de la cadena respiratoria mitocondrial, la depleci&oacute;n de ATP y el estr&eacute;s oxidativo y nitrativo que conducen a la apoptosis y necrosis celular<sup>73</sup>. Por ello, con el fin de potenciar la toxicidad del acetaminofeno se administran diversos inductores del sistema citocromo P-450, se produce la depleci&oacute;n de glutati&oacute;n<sup>74</sup> o bien se combinan ambos factores<sup>72</sup>.</font></p>     <p><font face="Verdana" size="2">Otro aspecto importante que no se ha estandarizado en estos modelos y que conlleva resultados diferentes es la dosis &oacute;ptima del f&aacute;rmaco, la v&iacute;a m&aacute;s adecuada de administraci&oacute;n y la necesidad o no de la inducci&oacute;n previa del sistema enzim&aacute;tico citocromo P-450<sup>74,75</sup>. Aspectos que se traducen en alguno de los inconvenientes m&aacute;s importantes de estos modelos como son la falta de reproductibilidad y la variabilidad en el tiempo que transcurre entre el da&ntilde;o infringido y la muerte de los animales<sup>48,50</sup>. Adem&aacute;s, en algunos modelos en roedores se han se&ntilde;alado importantes diferencias en las concentraciones de las principales prote&iacute;nas de la coagulaci&oacute;n respecto a las encontradas en el FHF del hombre<sup>76</sup>.</font></p>     <p><font face="Verdana" size="2">A pesar de los inconvenientes rese&ntilde;ados, los modelos animales de FHF inducido por acetaminofeno siguen siendo utilizados para estudiar aspectos tales como la implicaci&oacute;n de diversos mediadores de la respuesta inflamatoria<sup>77</sup>, la regeneraci&oacute;n hep&aacute;tica<sup>42</sup> y la terap&eacute;utica con hepatocitos humanos inmortales<sup>78</sup>.</font></p>     <p><font face="Verdana" size="2">Galactosamina</font></p>     <p><font face="Verdana" size="2">La D-galactosamina es una sustancia que metabolizada por la v&iacute;a de la galactosa en el h&iacute;gado, mediante la depleci&oacute;n de diversos intermediarios intracelulares de uridina, produce graves alteraciones en el metabolismo del ARN de los hepatocitos y finalmente la necrosis hep&aacute;tica<sup>48,79</sup> por lo que se ha utilizado para desarrollar modelos de FHF. En uno de los primeros modelos en conejos<sup>80</sup> se produjo la muerte entre las 21 y las 44 horas precedida por un periodo de coma de 2,6 horas de media y con hallazgos bioqu&iacute;micos e histol&oacute;gicos compatibles con el FHF; adem&aacute;s, se pudo comprobar en esta misma especie que la hepatotoxina no atravesaba la barrera hematoencef&aacute;lica<sup>81</sup>. M&aacute;s recientemente se ha utilizado la galactosamina en perros anestesiados, modelo en el que tambi&eacute;n se ponen de manifiesto los efectos caracter&iacute;sticos del fallo hep&aacute;tico humano como son el aumento en las enzimas marcadoras de da&ntilde;o hep&aacute;tico, bilirrubina, amonio, lactato y la coagulopat&iacute;a asociada, hipoglicemia, coma y aumento de la presi&oacute;n intracraneal<sup>34</sup>; sin embargo, en perros sin anestesiar los efectos no fueron semejantes probablemente por el efecto a&ntilde;adido del anest&eacute;sico en el primer caso. Ahora bien, en otros estudios o bien faltan datos significativos, especialmente los aumentos en la presi&oacute;n intracraneal, o bien los resultados no son muy homog&eacute;neos ya que existe una importante diferencia en la sensibilidad a la galactosamina en diferentes especies. Adem&aacute;s, el intervalo existente entre el da&ntilde;o infringido a los animales y la muerte presenta muy poca uniformidad, es un agente que resulta caro para su uso en modelos grandes y finalmente carece de inocuidad<sup>49</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En cerdos se ha desarrollado un modelo reproducible que puede ser utilizado por su tama&ntilde;o para la evaluaci&oacute;n de diversos sistemas de soporte dise&ntilde;ados para el tratamiento del FHF en humanos<sup>82</sup>. En cualquier caso son numerosos los estudios relacionados con el uso de galactosamina en diversas especies animales con el fin de mejorar el conocimiento del da&ntilde;o renal que acompa&ntilde;a al FHF<sup>83</sup> y de las v&iacute;as metab&oacute;licas hep&aacute;ticas durante el mismo<sup>84</sup>. Tambi&eacute;n ha merecido atenci&oacute;n el estudio de los posibles efectos de diversas sustancias como la prote&iacute;na quim&eacute;rica hiper-IL-6<sup>85</sup>, la cardiotropina 1<sup>86</sup> o la fructosa 1,6 difosfato en ratas<sup>87</sup>. Asimismo, estos modelos se han utilizado para comprobar diversos sistemas de asistencia hep&aacute;tica extracorp&oacute;rea<sup>88</sup>y sistemas bioartificiales tales como el uso de hepatocitos transfectados con el gen humano del antagonista del receptor de la interleucina 1 en ratas<sup>89</sup>o el uso de biorreactores con hepatocitos porcinos en cerdos<sup>46</sup> as&iacute; como los efectos potenciales del drenaje del l&iacute;quido cefaloraqu&iacute;deo y la craneotom&iacute;a descomprensiva en la rata<sup>90</sup>.</font></p>     <p><font face="Verdana" size="2">Tetracloruro de carbono</font></p>     <p><font face="Verdana" size="2">El uso de tetracloruro de carbono ha sido ampliamente utilizado como inductor de da&ntilde;o hep&aacute;tico cr&oacute;nico, especialmente como modelo de cirrosis hep&aacute;tica primaria<sup>91</sup>. Ahora bien, como agente inductor de FHF su uso ha sido muy restringido por ser muy poco reproducible y muy variable interespec&iacute;ficamente<sup>49,92</sup>. Su mecanismo de acci&oacute;n se lleva a cabo en el ret&iacute;culo endoplasm&aacute;tico por la formaci&oacute;n de intermediarios reactivos mediante su metabolismo a trav&eacute;s de diversas isoenzimas del sistema citocromo P-450<sup>93</sup>. Este mecanismo tambi&eacute;n involucra importantes alteraciones en la homeostasis del calcio mitocondrial y es dependiente de la dosis utilizada<sup>94</sup>.</font></p>     <p><font face="Verdana" size="2">En cerdos se realiz&oacute; un modelo relativamente uniforme que indujo coma y muerte en un per&iacute;odo de entre 12 y 52 horas mediante la combinaci&oacute;n de pretratamiento con fenobarbital y dos horas de interrupci&oacute;n del flujo sangu&iacute;neo arterial seguido de la administraci&oacute;n de la toxina por v&iacute;a intrag&aacute;strica<sup>95</sup>.</font></p>     <p><font face="Verdana" size="2">En ratas se ha comprobado que la inyecci&oacute;n de tetracloruro de carbono induce de modo concomitante tanto los procesos de da&ntilde;o agudo como los de regeneraci&oacute;n hep&aacute;tica<sup>96</sup>. El tetracloruro de carbono se utiliza como una sustancia modelo para dilucidar el mecanismo de acci&oacute;n de efectos hepatot&oacute;xicos tales como la degeneraci&oacute;n grasa, fibrosis, muerte hepatocellular y carcinog&eacute;nesis. En relaci&oacute;n con la dosis utilizada, el tiempo de exposici&oacute;n, la presencia de agentes potenciadores, o la edad del organismo afectado pueden producirse la regeneraci&oacute;n y llevar a la completa recuperaci&oacute;n del h&iacute;gado da&ntilde;ado<sup>97,98</sup>.</font></p>     <p><font face="Verdana" size="2">En ratas se ha utilizado para el estudio del trasplante intraespl&eacute;nico de hepatocitos<sup>99</sup>, para comprobar diversos tratamientos farmacol&oacute;gicos<sup>100</sup>, as&iacute; como para el estudio de los mecanismos por los que la regeneraci&oacute;n compensatoria del h&iacute;gado evita la progresi&oacute;n del da&ntilde;o t&oacute;xico<sup>42</sup>.</font></p>     <p><font face="Verdana" size="2">Como cr&iacute;ticas cabe destacar que aunque el da&ntilde;o producido por el tetracloruro de carbono se produce principalmente en el h&iacute;gado, afecta principalmente a la zona central del acino hep&aacute;tico y no se produce una necrosis masiva como en los casos de FHF en el hombre; no se metaboliza completamente en el h&iacute;gado de forma que parte de la toxina no metabolizada afecta y da&ntilde;a otros &oacute;rganos, especialmente los pulmones y los ri&ntilde;ones<sup>50</sup> y, por &uacute;ltimo existe una gran variaci&oacute;n en la sensibilidad interespec&iacute;fica y etaria debida fundamentalmente al diferente grado de desarrollo y eficacia del sistema de destoxificaci&oacute;n hep&aacute;tico del citocromo P-450.</font></p>     <p><font face="Verdana" size="2">Otros modelos qu&iacute;micos</font></p>     <p><font face="Verdana" size="2">Tambi&eacute;n se ha inducido FHF mediante el uso de venenos tales como el derivado de la <i>Amanita phalloides</i>, que aunque sea una intoxicaci&oacute;n poco frecuente sus efectos son bien conocidos en humanos. De hecho, el efecto de las amatoxinas se debe a la inducci&oacute;n de la ARN polimerasa provocando toxicidad celular en hepatocitos, c&eacute;lulas de la mucosa intestinal y c&eacute;lulas tubulares renales y se ha utilizado para desarrollar un modelo animal de fallo hep&aacute;tico en cerdos en combinaci&oacute;n con lipopolisac&aacute;rido<sup>101</sup>. Tambi&eacute;n se han desarrollado modelos en los que combinan la amanitina con lipopolisac&aacute;ridos en cerdos con el fin de estudiar la supervivencia con trasplante ortot&oacute;pico de h&iacute;gado y tacrolimus<sup>102</sup>.</font></p>     <p><font face="Verdana" size="2">La tioacetamida causa necrosis hepatocelular despu&eacute;s de su biotransformaci&oacute;n mediante la v&iacute;a de las monooxigenasas<sup>103</sup> y ha sido utilizada para explorar la neurobiolog&iacute;a de la encefalopat&iacute;a hep&aacute;tica en el FHF<sup>34</sup>, el papel de las especies reactivas del ox&iacute;geno<sup>104</sup> as&iacute; como la acci&oacute;n protectora de sustancias antioxidantes como la curcumina<sup>105</sup>, sustancias pro-regenerativas<sup>106</sup>, el empeoramiento de la encefalopat&iacute;a con el tratamiento cr&oacute;nico de sustancias como la indometazina<sup>107</sup>o la contribuci&oacute;n relativa de las isoenzimas de la&oacute;xido n&iacute;trico sintetasa (NOS) en la encefalopat&iacute;a asociada al FHF en ratas<sup>108</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La administraci&oacute;n de azoximetano en ratones induce par&aacute;metros similares a los encontrados en el FHF del hombre<sup>109</sup>; de hecho, recientemente, se ha demostrado que es un modelo animal sencillo y reproducible muy &uacute;til para el estudio de los efectos de la manipulaci&oacute;n g&eacute;nica sobre las complicaciones cerebrales que acompa&ntilde;an al FHF<sup>110</sup>.</font></p>     <p><font face="Verdana" size="2">Otros modelos emplean la administraci&oacute;n parenteral de <i>Propinebacterium acnes</i> y lipopolisac&aacute;rido para estudiar las diferentes expresiones de mol&eacute;culas estimuladoras<sup>111</sup>; la combinaci&oacute;n de D-galactosamina y lipopolisac&aacute;rido en ratas para comprobar la disminuci&oacute;n de la mortalidad de los animales a los que se administraba el factor de crecimiento endotelial vascular<sup>112 </sup>y la administraci&oacute;n intraportal de alfa-amanitina y lipopolisac&aacute;rido en cerdos para estudiar soportes de h&iacute;gado bioartificial<sup>113</sup>.</font></p>     <p><font face="Verdana" size="2"><i>Modelos v&iacute;ricos</i></font></p>     <p><font face="Verdana" size="2">A pesar de que la hepatitis v&iacute;rica es la causa m&aacute;s importante de FHF, el uso de agentes infecciosos para desarrollar modelos animales de FHF ha sido en general muy desafortunado<sup>47</sup> y solamente ratones transg&eacute;nicos que sobreexpresan las prote&iacute;nas del virus de la hepatitis C (HBV) o ratones BALB/cj infectados con el MHV-3<sup>114,115</sup> han ofrecido alguna luz sobre los mecanismos del FHF inducido por virus. Sin embargo, estos modelos murinos tienen limitaciones significativas en lo que hace referencia a la ausencia de medida de la presi&oacute;n intracraneal, la principal causa de muerte en el FHF humano, o en los datos sobre las toxinas implicadas en la encefalopat&iacute;a hep&aacute;tica y el edema cerebral adem&aacute;s del peque&ntilde;o tama&ntilde;o de los modelos que hacen imposible la prueba de nuevos sistemas de soporte hep&aacute;tico<sup>48,49</sup>.</font></p>     <p><font face="Verdana" size="2">M&aacute;s recientemente, nuestro grupo de investigaci&oacute;n ha descrito un nuevo modelo animal de FHF producido por la infecci&oacute;n experimental de conejos con el virus de la enfermedad hemorr&aacute;gica del conejo (RHDV)<sup>116</sup>. El RHDV es un miembro de la familia de los <i>Caliciviridae</i> que causa en los conejos una enfermedad altamente mortal, descrita por vez primera en China en 1984<sup>117</sup>.</font></p>     <p><font face="Verdana" size="2">La enfermedad hemorr&aacute;gica del conejo (RHD, del ingl&eacute;s rabbit haemorrhagic disease) es una hepatitis v&iacute;rica que presenta con algunas hepatitis v&iacute;ricas humanas de tipo fulminante (B, C, y E) un parentesco sorprendente cl&iacute;nico, anatomopatol&oacute;gico y de su modo de transmisi&oacute;n<sup>116,118</sup>. El virus no se replica en ning&uacute;n otro vertebrado<sup>119</sup> y no se ha se&ntilde;alado hasta la fecha su transmisi&oacute;n al hombre, a&uacute;n entre las poblaciones m&aacute;s expuestas al virus.</font></p>     <p><font face="Verdana" size="2">Se ha demostrado que el ant&iacute;geno viral puede encontrarse en los hepatocitos ya a las 12 horas posinfecci&oacute;n (p.i.) y que a las 36 y 48 p.i. se localiza en el 60-80% de los hepatocitos; as&iacute; mismo es posible detectarlo en localizaciones extrahep&aacute;ticas, tales como los linfocitos y los macr&oacute;fagos del bazo aunque no en el cerebro<sup>120</sup>.</font></p>     <p><font face="Verdana" size="2">La RDH se caracteriza por su alta morbilidad y una mortalidad cercana al 90%<sup>116,121</sup>. Los conejos mueren en un rango de tiempo definido, entre las 36 y las 54 horas p.i. con signos cl&iacute;nicos caracter&iacute;sticos de un FHF progresivo y coma. Adem&aacute;s, el intervalo existente desde la infecci&oacute;n hasta el momento en que mueren la mayor parte de los animales aporta una amplia ventana terap&eacute;utica que hace que nuestro modelo cumpla otro de los requisitos imprescindibles que es la existencia de un per&iacute;odo de tiempo suficiente entre agresi&oacute;n y muerte para poder investigar adecuadamente diversas pautas de tratamiento o tecnolog&iacute;as de soporte hep&aacute;tico<sup>50</sup>. Por otra parte, al tratarse de una especie de tama&ntilde;o medio es posible tomar con facilidad muestras seriadas de sangre, lo que permite una monitorizaci&oacute;n relativamente sencilla de la presi&oacute;n intracraneal y de las alteraciones bioqu&iacute;micas producidas en el curso de la infecci&oacute;n y hace factible un seguimiento adecuado durante los experimentos<sup>116</sup>.</font></p>     <p><font face="Verdana" size="2">En este modelo se reproducen los par&aacute;metros bioqu&iacute;micos e histol&oacute;gicos y los signos cl&iacute;nicos m&aacute;s representativos del FHF del hombre<sup>116</sup>. As&iacute;, detectamos aumentos significativos en las actividades plasm&aacute;ticas de las transaminasas, lactato deshidrogenasa y la concentracci&oacute;n de bilirrubina. Adem&aacute;s, se produce un aumento en la concentraci&oacute;n plasm&aacute;tica de los amino&aacute;cidos arom&aacute;ticos con una disminuci&oacute;n significativa del &iacute;ndice de Fischer e hipoglucemia, al igual que en el FHF humano. Los trastornos de la coagulaci&oacute;n observados en este modelo son la disminuci&oacute;n de los factores V y VII y la prolongaci&oacute;n del tiempo de protrombina. El alargamiento del tiempo de protrombina es un elemento pron&oacute;stico en el FHF. Estas alteraciones podr&iacute;an ser una consecuencia de la s&iacute;ntesis disminuida de los factores de la coagulaci&oacute;n por el h&iacute;gado da&ntilde;ado y el desarrollo de coagulaci&oacute;n intravascular diseminada (CID). En las &uacute;ltimas etapas de la enfermedad los animales presentan signos neurol&oacute;gicos de encefalopat&iacute;a hep&aacute;tica, coma y muerte cerebral. La encefalopat&iacute;a hep&aacute;tica se encuentra invariablemente asociada con el FHF en el hombre, y se considera un criterio esencial para que un modelo animal de FHF sea relevante desde el punto de vista cl&iacute;nico. Este hecho constituye una limitaci&oacute;n muy importante en algunos modelos, tales como los basados en la hepatectom&iacute;a parcial, en los cuales las complicaciones neurol&oacute;gicas, la encefalopat&iacute;a o la hipertensi&oacute;n intracraneal est&aacute;n raramente presentes. El aumento de la presi&oacute;n intracraneal en los animales infectados por el RHDV se acompa&ntilde;&oacute; de incrementos de las concentraciones plasm&aacute;ticas de amonio. El examen histol&oacute;gico e inmunohistoqu&iacute;mico revel&oacute; por un lado, &aacute;reas de necrosis en el h&iacute;gado asociadas con hemorragias e infiltraci&oacute;n de neutr&oacute;filos y, por otro, amplias zonas de apoptosis con una elevada expresi&oacute;n de caspasa 3 especialmente en las zonas periportales del acino hep&aacute;tico<sup>122</sup>.</font></p>     <p><font face="Verdana" size="2">Asimismo, se observaron incrementos significativos en la expresi&oacute;n de la enzima &oacute;xido n&iacute;trico sintasa inducible (iNOS) y del TNF-alfa, al igual que se ha descrito en pacientes con FHF<sup>123</sup>. El TNF-alfa es un agente que puede conducir tanto a la proliferaci&oacute;n celular como la apoptosis; su sobreexpresi&oacute;n se correlaciona tanto con el &iacute;ndice de apoptosis en el FHF como con la regeneraci&oacute;n hep&aacute;tica<sup>124</sup>.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">El equilibrio entre la proliferaci&oacute;n y la apoptosis puede dirigirse de acuerdo con la presencia de un exceso de especies reactivas del ox&iacute;geno (EROs) que si no son neutralizadas por acci&oacute;n del glutati&oacute;n o diversas actividades enzim&aacute;ticas antioxidantes, causan da&ntilde;o mitocondrial y liberaci&oacute;n de citocromo c hacia el citosol disparando la activaci&oacute;n de las caspasas y la muerte celular<sup>125</sup>. Esta situaci&oacute;n se produce en nuestro modelo animal, pues hemos descrito tanto una reducci&oacute;n del glutati&oacute;n y las principales actividades enzim&aacute;ticas antioxidantes, como la presencia de estr&eacute;s oxidativo<sup>126</sup> as&iacute; como una importante implicaci&oacute;n de los mecanismos de apoptosis<sup>122</sup>. Por tanto, el conjunto de an&aacute;lisis y observaciones recogidas en los animales infectados por el RHDV refuerza su posible utilizaci&oacute;n para el estudio de la patogenia y el tratamiento del FHF.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><b>Conclusiones</b></font></p>     <p><font face="Verdana" size="2">Existen pocas entidades en medicina que sean m&aacute;s graves y desalentadoras que el FHF. Tanto el conocimiento como el tratamiento de este s&iacute;ndrome han estado limitados por la falta de modelos animales satisfactorios. Las desventajas potenciales de los modelos quir&uacute;rgicos son que adolecen de reversibilidad potencial o recuperaci&oacute;n, son poco reproducibles, dependen de la pericia quir&uacute;rgica, muchos de los par&aacute;metros cl&iacute;nicos y bioqu&iacute;micos t&iacute;picos del FHF del hombre no se presentan siempre y no reproducen un ambiente complicado por la liberaci&oacute;n de mediadores de la respuesta inflamatoria y productos de la necrosis celular hep&aacute;tica. Por ello, su utilidad se limita a la evaluaci&oacute;n de diversos sistemas de soporte hep&aacute;tico. Los modelos que utilizan hepatotoxinas no tienen tales restricciones pero tambi&eacute;n presentan diversos inconvenientes como son la necesidad de ajustar la dosis y las variables susceptibilidades tanto interespec&iacute;ficas como etarias, sin olvidar el peligro potencial que en la mayor&iacute;a de los casos presentan tales agentes qu&iacute;micos. En cuanto al&uacute;nico modelo v&iacute;rico que hasta el momento ha demostrado su viabilidad, inducido en conejos mediante el RHDV, es altamente reproducible, presenta car&aacute;cter&iacute;sticas similares al FHF del hombre y presenta como limitaci&oacute;n que la &uacute;nica especie susceptible es el conejo lo que lejos de ser un inconveniente se convierte en ventaja al no ser, por tanto, peligroso para las personas involucradas en los estudios.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana"><B>Referencias</B></font></p>     <!-- ref --><p><font face="Verdana" size="2">1. Lee WR. Acute liver failure. 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J Lab Clin Med 2004; 144: 215-222.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=3501714&pid=S0212-1611200700020000900126&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b><a name="back"></a><a href="#top"><img border="0" src="/img/revistas/nh/v22n2/seta.gif" width="15" height="17"></a>Dirección para correspondencia:</b>    <BR>Mar&iacute;a Jes&uacute;s Tu&ntilde;&oacute;n    <BR>Departamento de Ciencias Biom&eacute;dicas    <BR>Universidad de Le&oacute;n    <BR>24071 Le&oacute;n    <BR>E-mail: <a href="mailto:mjtung@unileon.es">mjtung@unileon.es</a></font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Recibido: 10-XI-2006.    <BR>Aceptado: 22-XII-2006.</font></p>      ]]></body><back>
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