<?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>1130-0108</journal-id>
<journal-title><![CDATA[Revista Española de Enfermedades Digestivas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. esp. enferm. dig.]]></abbrev-journal-title>
<issn>1130-0108</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Española de Patología Digestiva]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1130-01082008000800001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Enfermedad de Wilson: Una enfermedad rara pero presente]]></article-title>
<article-title xml:lang="en"><![CDATA[Wilson's disease: a rare thought present condition]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís Muñoz]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís Herruzo]]></surname>
<given-names><![CDATA[J. A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Universitario 12 de Octubre Servicio de Medicina del Aparato Digestivo ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2008</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2008</year>
</pub-date>
<volume>100</volume>
<numero>8</numero>
<fpage>447</fpage>
<lpage>455</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S1130-01082008000800001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S1130-01082008000800001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S1130-01082008000800001&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[ <p align="right"><b><font face="Verdana" size="2">EDITORIAL</font></b></p>     <p>&nbsp;</p>     <p><b><font face="Verdana" size="4">Enfermedad de Wilson. Una enfermedad rara pero presente</font></b></p>     <p><b><font face="Verdana" size="4">Wilson's disease - a rare thought present condition</font></b></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><B><font face="Verdana" size="2">P. Sol&iacute;s Mu&ntilde;oz y J. A. Sol&iacute;s Herruzo</font></B></p>     <p><font face="Verdana" size="2">Servicio de Medicina del Aparato Digestivo. Hospital Universitario "12 de Octubre". Madrid</font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">La enfermedad de Wilson (EW) o degeneraci&oacute;n hepatolenticular, tal y como fue denominada por Kinnier Wilson en 1912 (1), es un trastorno del metabolismo del cobre que se hereda de forma autos&oacute;mica recesiva (2). Su incidencia a nivel global es de 1 de cada 30.000 habitantes, aunque esta tiene una gran variabilidad geogr&aacute;fica. La EW se debe a mutaciones en el gen de una ATPasa tipo P (ATP7B) implicada en el transporte del cobre al canal&iacute;culo biliar y al aparato Trans-Golgi.</font></p>     <p><font face="Verdana" size="2">El cobre procedente de la dieta, una vez captado por los enterocitos duodenales, puede quedar unido a prote&iacute;nas intracelulares (<i>metalotione&iacute;nas</i>) o bien puede ser exportado al exterior a trav&eacute;s de una prote&iacute;na transportadora localizada en la membrana basolateral de esas c&eacute;lulas denominada ATP7A o ATPasa de Menkes (3). El gen que codifica esta prote&iacute;na se expresa en todos los tejidos a excepci&oacute;n del h&iacute;gado. Dicho gen se encuentra mutado en la enfermedad de Menkes, ligada al cromosoma X y caracterizada por un d&eacute;ficit de cobre consecuencia de una malabsorci&oacute;n de este metal. Una vez en la sangre, el cobre procedente del intestino se une a la alb&uacute;mina o a la histidina, mientras que el de origen hep&aacute;tico se encuentra formando parte de la holoceruloplasmina. El cobre unido a estas mol&eacute;culas, una vez reducido a su forma cuprosa, se une al transportador hCtr1 de los hepatocitos y penetra en las c&eacute;lulas (4). Por su alto poder oxidante, el cobre debe unirse a diversas prote&iacute;nas celulares, fundamentalmente a las metalotione&iacute;nas, que neutralizan ese poder (5). Otras prote&iacute;nas de peque&ntilde;o tama&ntilde;o denominadas metalochaperonas hacen de transportadores de cobre dentro de las c&eacute;lulas (6). Entre estas, la ATOX1 transporta el cobre hasta la ATP7B. Esta enzima tiene seis zonas ricas en ciste&iacute;na y metionina a las que se une este metal (7). La localizaci&oacute;n de la ATP7B dentro de los hepatocitos no es &uacute;nica y puede oscilar entre el aparato Trans-Golgi y el capilar biliar, dependiendo ello de la concentraci&oacute;n de cobre en las c&eacute;lulas. Cada uno de estos emplazamientos est&aacute; ligado a una funci&oacute;n diferente. La primera se relaciona con la formaci&oacute;n de homoceruloplasmina y el paso del cobre a la sangre; la segunda con la excreci&oacute;n del cobre con la bilis (8). En condiciones normales, cuando la concentraci&oacute;n de cobre es baja, la ATP7B se localiza en la zona Trans del aparato de Golgi y permite la uni&oacute;n del cobre a la apoceruloplasmina para formar holoceruloplasmina antes de su paso a la sangre. Cuando los niveles intracelulares de cobre son altos, la ATP7B se desplaza al polo biliar de los hepatocitos, lo que facilita la excreci&oacute;n biliar del cobre (9). No se conoce con detalle cu&aacute;l es el mecanismo molecular por el que la ATP7B consigue la excreci&oacute;n del cobre por el polo biliar, pero se supone que la prote&iacute;na Murr1 o COMMD1 juega un importante papel (10).</font></p>     <p><font face="Verdana" size="2">La ATP7B es codificada por el gen <i>ATP7B</i> localizado en el brazo largo del cromosoma 13 (13q14.3) (11-14). En la EW se han descrito unas 300 mutaciones del este gen, pero en la mayor&iacute;a de los casos la enfermedad es ocasionada por la asociaci&oacute;n de dos mutaciones heterozigotas. Cuando esto ocurre, el cobre no puede ser vertido a la bilis y, en consecuencia, se acumula en los hepatocitos. Asimismo, el cobre tampoco puede pasar al Trans-Golgi, no se puede unir a la apoceruloplasmina y no se forma holoceruloplasmina. Cuando la apoceruloplasmina pasa al plasma, es eliminada r&aacute;pidamente, ya que su vida media es m&aacute;s corta que la de la holoceruloplasmina. La escasa cantidad de cobre que pasa a la sangre lo hace en su forma libre, no unida a la ceruloplasmina, por lo que se deposita f&aacute;cilmente en distintos tejidos, principalmente en el sistema nervioso, el t&uacute;bulo renal o la c&oacute;rnea, dando lugar a algunas de las manifestaciones que caracterizan a esta enfermedad.</font></p>     <p><font face="Verdana" size="2">La mutaci&oacute;n m&aacute;s frecuente en pacientes europeos con EW es la sustituci&oacute;n de una histidina por glutamato en la posici&oacute;n 1069 (H1069Q), que se encuentra en el 40 al 60% de todos los casos (15). Esta mutaci&oacute;n influye en la utilizaci&oacute;n de ATP y en consecuencia en la adquisici&oacute;n de la energ&iacute;a que requiere el transporte del cobre (16). En Espa&ntilde;a, se ha encontrado que la mutaci&oacute;n m&aacute;s frecuente es la M645R, presente en el 55% de los pacientes. La frecuencia de las restantes mutaciones es mucho m&aacute;s baja (17,18), si bien en las Islas Canarias se ha descrito una alta prevalencia de la mutaci&oacute;n L708P (19). Ser&iacute;a interesante conocer las mutaciones existentes en la poblaci&oacute;n estudiada por el grupo de Rodrigo Agudo (20).</font></p>     <p><font face="Verdana" size="2">No se conocen a&uacute;n bien cu&aacute;les son los mecanismos por los que el cobre ejerce su toxicidad celular (21). Sabiendo que el cobre es un agente prooxidante, se ha considerado que el estr&eacute;s oxidativo podr&iacute;a jugar un papel importante. A trav&eacute;s de la v&iacute;a de Fenton y de otras reacciones redox, tanto el hierro (22,23) como el cobre (24,25) pueden provocar estr&eacute;s oxidativo y la peroxidaci&oacute;n lip&iacute;dica, dando lugar a lesiones de membrana y disfunci&oacute;n de las organelas celulares (26). Es bien sabido que en esta enfermedad existen importantes anomal&iacute;as morfol&oacute;gicas y funcionales de las mitocondrias (27). Este mecanismo podr&iacute;a justificar el empleo de antioxidantes en estos enfermos. Otro mecanismo recientemente sugerido por el que el cobre podr&iacute;a provocar la muerte de los hepatocitos y la anemia se basa en su capacidad para activar a la esfingomielinasa &aacute;cida y liberar ceramida. Tanto la deficiencia gen&eacute;tica como la inhibici&oacute;n farmacol&oacute;gica de la esfingomielinasa &aacute;cida previenen la apoptosis hepatocitaria y el desarrollo de hepatopat&iacute;a en modelos murinos de EW. La activaci&oacute;n de la esfingomielinasa &aacute;cida conlleva la liberaci&oacute;n de fosfatidilserina a la sangre. Los hemat&iacute;es expuestos a esta &uacute;ltima se destruyen r&aacute;pidamente, lo que explicar&iacute;a la anemia de la EW (28). Algunos estudios indican que, al menos en las fases iniciales de la EW, las lesiones pueden no estar relacionadas con el efecto directo del cobre sino con alteraciones en el metabolismo del colesterol y otras v&iacute;as metab&oacute;licas espec&iacute;ficas (29).</font></p>     <p><font face="Verdana" size="2">En el presente n&uacute;mero de esta revista, Rodrigo Agudo y cols. recogen la experiencia reunida en un solo centro sobre la EW (20). Este estudio realizado en la regi&oacute;n de Murcia se suma a otros publicados previamente y realizados en otras regiones de Espa&ntilde;a (30,31). En su estudio, los autores refieren las caracter&iacute;sticas demogr&aacute;ficas de sus enfermos, las formas de presentaci&oacute;n de la enfermedad, las alteraciones anal&iacute;ticas, el tratamiento establecido y la evoluci&oacute;n a lo largo de unos diez a&ntilde;os. La enfermedad rara vez se diagnostica antes de los 3 a&ntilde;os de edad y la mayor&iacute;a de los casos se detecta durante la adolescencia como enfermedad hep&aacute;tica. Como refieren los autores de este estudio, la mayor parte de los casos descritos en la literatura se reconocen a partir de una elevaci&oacute;n asintom&aacute;tica de las <i>transaminasas</i>. En algunos casos, la enfermedad se diagnostica en edades m&aacute;s avanzadas, por encima de los 50 a&ntilde;os, coincidiendo con una enfermedad tambi&eacute;n m&aacute;s evolucionada y teniendo, por tanto, peor pron&oacute;stico. Aunque ninguno de los pacientes incluidos en la serie ahora publicada lo presentaba, diversos autores han comunicado la posibilidad de que la enfermedad hep&aacute;tica se manifieste como una hepatitis no infecciosa, que puede simular una <i>hepatitis autoinmune</i> (32). Como ocurre en estas hepatitis, los pacientes refieren astenia, artropat&iacute;a, erupci&oacute;n cut&aacute;nea, hipergammaglobulinemia e incluso la positividad de los anticuerpos antinucleares (ANA) y antim&uacute;sculo liso (SMA). El correcto reconocimiento de la etiolog&iacute;a de estos casos es fundamental para indicar el tratamiento m&aacute;s adecuado (33). La presentaci&oacute;n de la enfermedad en forma de <i>fallo hep&aacute;tico agudo</i> se describe en el 5-15% de los trasplantes hep&aacute;ticos infantiles, en ocasiones como primera manifestaci&oacute;n de la EW (34). Estos casos suele cursar con anemia hemol&iacute;tica intravascular y prueba de Coombs negativa (35). En este contexto, es caracter&iacute;stico hallar niveles extremadamente bajos de fosfatasa alcalina y comparativamente reducidos de transaminasas y de &aacute;cido &uacute;rico en sangre. Por ello, la presencia de un cociente de fosfatasa alcalina (en IU/l) frente a bilirrubina (en mg/dl) &lt; 2 es t&iacute;pica de la insuficiencia hep&aacute;tica aguda por EW (36-38). No todos han confirmado la utilidad diagn&oacute;stica del bajo cociente fosfatasa alcalina/bilirrubina (39).</font></p>     <p><font face="Verdana" size="2">Como se&ntilde;alan Rodrigo Agudo y cols. en su estudio, la forma de presentaci&oacute;n neuropsiqui&aacute;trica es m&aacute;s frecuente en los adultos, aunque puede detectarse alguna alteraci&oacute;n de este tipo hasta en la mitad de los adolescentes (40). En su estudio, las manifestaciones neurol&oacute;gicas m&aacute;s frecuentes fueron los<i> temblores, </i>la<i> disartria</i> y la <i>diston&iacute;a</i>, que las encontraron hasta en el 17% de los pacientes. Estos resultados son coincidentes con lo referido en la literatura, ya que los temblores y la disartria son m&aacute;s frecuentes que la diston&iacute;a. Dentro de las manifestaciones <i>psiqui&aacute;tricas</i>, los cambios en la personalidad y la <i>irritabilidad</i> son las m&aacute;s frecuentes, aunque algunos pacientes se presentan con depresi&oacute;n o con un cuadro psic&oacute;tico (41).</font></p>     <p><font face="Verdana" size="2">Otras manifestaciones menos comunes de la EW son la <i>litiasis biliar</i> de bilirrubinato, justificada por las crisis intermitentes de hem&oacute;lisis y por la cirrosis hep&aacute;tica, cuando esta existe. Es bien conocido el <i> anillo de Kayser </i>y<i> Fleischer</i>, que en el estudio comentado estaba presente en el 35,3% de los enfermos con manifestaciones exclusivamente hep&aacute;ticas, pero en todos los que presentaban manifestaciones neurol&oacute;gicas o psiqui&aacute;tricas, y las <i>cataratas en giraso</i>l, determinadas por el dep&oacute;sito de cobre en el cristalino (42). A nivel endocrinol&oacute;gico se describe la <i>ginecomastia</i> en los varones, la <i>amenorrea</i> en las mujeres o <i>hipoparatiroidismo</i> (43). Aunque el <i>embarazo</i> es posible, este se ve dificultado y existe un riesgo aumentado de <i>abortos</i> y otras complicaciones (44). Tambi&eacute;n se han descrito algunas manifestaciones cardiovasculares, entre las que figuran anomal&iacute;as en el <i>electrocardiograma</i> (50%), <i>hipotensi&oacute;n ortost&aacute;tica</i> (20%) y la <i>fibrilaci&oacute;n ventricular</i> (45,46). Los pacientes tambi&eacute;n pueden sufrir <i>urolitiasis</i> o, con mayor frecuencia, alteraciones funcionales del t&uacute;bulo renal proximal expresadas por un <i>s&iacute;ndrome de Fanconi</i> (47). Aunque cl&aacute;sicamente se ha cre&iacute;do que el riesgo de <i>carcinoma hepatocelular</i> es bajo en la EW, estudios recientes indican que este tumor es m&aacute;s frecuente de lo que se piensa (48,49), por lo que los pacientes con cirrosis tambi&eacute;n deben ser sometidos a vigilancia para detectar precozmente el desarrollo de este tumor (50). Tambi&eacute;n son varios los autores que refieren el desarrollo de colangiocarcinomas en estos enfermos (49,51) y en ratones con silenciamiento del gen ATP7B (52).</font></p>     <p><font face="Verdana" size="2">Con respecto al diagn&oacute;stico de la enfermedad, se puede considerar que una ceruloplasmina menor a 5 mg/dl es pr&aacute;cticamente diagn&oacute;stica de EW en un paciente con alteraciones hep&aacute;ticas o cl&iacute;nica neurol&oacute;gica t&iacute;pica. La presencia de una <i>ceruloplasmina</i> menor a 20 mg/dl aparece en el 95% de los pacientes y en el 20% de los heterocigotos asintom&aacute;ticos, aunque no es suficiente para el diagn&oacute;stico (53). No obstante, puede ser normal en algunos casos por tratarse de un reactante de fase aguda (54) y puede estar descendida en la enfermedad de Menkes, en la aceruloplasminemia y en las hipoproteinemias (55). Si combinamos estos niveles de ceruloplasmina con el hallazgo del anillo de Kayser- Fleischer en el examen oftalmol&oacute;gico o con unos niveles altos de cobre en el tejido obtenido en la biopsia hep&aacute;tica (&gt; 250 &mu;g/g de peso seco), la especificidad aumenta considerablemente. La medici&oacute;n del <i>cobre en el tejido hep&aacute;tico</i> es probablemente la prueba m&aacute;s espec&iacute;fica para el diagn&oacute;stico de EW. No obstante, existen falsos negativos (intensa fibrosis y escasos hepatocitos, distribuci&oacute;n irregular del cobre) y falsos positivos (colestasis) (56,57). Menos sensibles son las t&eacute;cnicas histoqu&iacute;micas de detecci&oacute;n de cobre en el tejido hep&aacute;tico, ya estas son positivas &uacute;nicamente en las fases avanzadas de la enfermedad. En la EW <i>el cobre urina</i>rio de 24 horas suele ser mayor de 40 &mu;g y muchas veces mayor de 100 &mu;g (58,59). Tras administrar D-penicilamina 500 mg cada 12 horas por v&iacute;a oral, se produce un aumento considerable de la cupruria, tom&aacute;ndose niveles superiores a 1.600 &mu;g como diagn&oacute;sticos. Sin embargo, esta prueba ha sido validada s&oacute;lo en la infancia, con el fin de diferenciar la EW de otras hepatopat&iacute;as, por ejemplo, la hepatitis autoinmune (60); no obstante, algunos estudios sugieren que tambi&eacute;n puede ser &uacute;til en los adultos (61).</font></p>     <p><font face="Verdana" size="2">El <i>anillo de Kayser-Fleischer </i>es t&iacute;pico de la enfermedad aunque no patognom&oacute;nico, ya que se puede encontrar tambi&eacute;n en enfermedades colest&aacute;sicas cr&oacute;nicas. Este anillo se encuentra en el 50% de los pacientes con manifestaciones hep&aacute;ticas, como lo muestra el estudio de Rodr&iacute;guez Agudo y cols., y en pr&aacute;cticamente todos los pacientes con manifestaciones neurol&oacute;gicas. S&oacute;lo en el 2% de estos &uacute;ltimos pacientes falta este hallazgo.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Puesto que ninguna prueba permite excluir o diagnosticar la EW con absoluta seguridad, se han intentado crear sistemas diagn&oacute;sticos basados en puntuaciones que estar&iacute;an especialmente indicados en los casos at&iacute;picos, de presentaci&oacute;n tard&iacute;a, en ausencia de sintomatolog&iacute;a neuropsiqui&aacute;trica t&iacute;pica o de bioqu&iacute;mica caracter&iacute;stica. Uno de ellos es el sistema aceptado en el VIII Congreso Internacional de la Enfermedad de Wilson y Enfermedad de Menkes, en Leipzig. Este sistema, clasifica la enfermedad seg&uacute;n su forma de presentaci&oacute;n en: <i>H1</i> cuando es hep&aacute;tica aguda, <i>H2</i> cuando es hep&aacute;tica cr&oacute;nica, <i>N1</i> cuando debuta con sintomatolog&iacute;a neuropsiqui&aacute;trica y hep&aacute;tica, <i>N2</i> cuando tiene s&iacute;ntomas neurol&oacute;gicos pero la afectaci&oacute;n hep&aacute;tica es asintom&aacute;tica, <i>NX</i> cuando no hay alteraciones hep&aacute;ticas de ning&uacute;n tipo y <i>O</i> cuando debuta con otra sintomatolog&iacute;a (57,62,63).</font></p>     <p><font face="Verdana" size="2">Algunos autores defienden la importancia del diagn&oacute;stico gen&eacute;tico a pesar de que las restantes pruebas sean negativas, sobre todo en ni&ntilde;os con enfermedad hep&aacute;tica no filiada o con histolog&iacute;a compatible con enfermedad grasa del h&iacute;gado no alcoh&oacute;lica (64).</font></p>     <p><font face="Verdana" size="2">A pesar de que la base molecular de la EW es siempre la misma, llama la atenci&oacute;n la marcada <i>heterogeneidad de las manifestaciones cl&iacute;nicas</i> de esta enfermedad. Inicialmente se atribuy&oacute; a la gran cantidad de mutaciones descritas en este gen. Sin embargo, es muy probable que tambi&eacute;n influyan otros factores. En realidad, es extremadamente complejo demostrar que existe alguna correlaci&oacute;n entre genotipo y el fenotipo de la EW, pues la mayor&iacute;a de los pacientes son heterocigotos compuestos. En un estudio reciente, hasta el 77% de los pacientes con la mutaci&oacute;n H1069Q la ten&iacute;a con car&aacute;cter heterocigoto (65). En un metaan&aacute;lisis se ha encontrado que los pacientes homocigotos para esta mutaci&oacute;n tienen una presentaci&oacute;n neurol&oacute;gica tard&iacute;a (66). Sin embargo, existen familias, incluso gemelos id&eacute;nticos con la misma mutaci&oacute;n, en quienes las manifestaciones cl&iacute;nicas son distintas. Por &uacute;ltimo, el 15% de los pacientes diagnosticados de la forma cl&aacute;sica de EW no tiene ninguna mutaci&oacute;n conocida en el gen ATP7B (67,68).</font></p>     <p><font face="Verdana" size="2">Los <i>familiares de primer grado</i> de casos probados deben ser sometidos a estudio para reconocer tempranamente la presencia de la enfermedad. Estos estudios deben incluir la determinaci&oacute;n del: perfil hep&aacute;tico, fundamentalmente de las transaminasas, del cobre en plasma y de la ceruloplasmina s&eacute;rica, la cupruria de 24 horas y la b&uacute;squeda del anillo de Kayser-Fleischer mediante l&aacute;mpara de hendidura. En caso de hallar alguna anomal&iacute;a en las pruebas mencionadas previamente, se proceder&aacute; a la realizaci&oacute;n de biopsia hep&aacute;tica. El an&aacute;lisis mutacional en el momento actual es dif&iacute;cil, ya que la mayor&iacute;a de los pacientes son heterocigotos combinados y tambi&eacute;n debido a que no siempre las mutaciones reportadas producen prote&iacute;nas no funcionantes. Este m&eacute;todo de estudio de los familiares de pacientes con EW puede ser &uacute;til en aquellos casos en los que ya se conoce el genotipo del caso &iacute;ndice o en determinadas &aacute;reas geogr&aacute;ficas en las que sabemos que el espectro mutacional es escaso, como en Islandia, las Islas Canarias (19) o Cerde&ntilde;a. &Uacute;nicamente los descendentes que sean homocigotos o heterocigotos compuestos para mutaciones conocidas deben recibir tratamiento preventivo con quelantes. Si son heterocigotos simples, esta profilaxis no es necesaria.</font></p>     <p><font face="Verdana" size="2">En relaci&oacute;n con el tratamiento, la terapia m&aacute;s efectiva sigue siendo la utilizaci&oacute;n de quelantes de cobre fundamentalmente la <i>D-penicilamina</i>. La enfermedad sigue un curso fatal sin tratamiento m&eacute;dico o trasplante. En el modelo animal de la EW (rata Long-Evans Cinnamon) la administraci&oacute;n de D-penicilamina produce la disoluci&oacute;n de los gr&aacute;nulos de cobre que se encuentran en los lisosomas y evita el fallo hep&aacute;tico agudo. Otras alternativas son la <i>trientina</i> y el <i>zinc</i>. La <i>trientina</i> tiene un mecanismo similar pero una estructura molecular completamente distinta a la de la D-penicilamina. El mecanismo de acci&oacute;n del <i>zinc</i> es distinto, ya que act&uacute;a bloqueando la absorci&oacute;n intestinal de cobre (69). El zinc aumenta las metalotione&iacute;nas en los enterocitos, el cobre se une a ellas y se retiene en las c&eacute;lulas intestinales hasta que estas se descaman en la luz del intestino. De esta forma, el zinc provoca un balance negativo de cobre que conduce a una depleci&oacute;n del cobre del organismo. El aumento de metaloprote&iacute;nas ocurre tambi&eacute;n en los hepatocitos, lo cual contribuye a proteger a estas c&eacute;lulas frente al efecto t&oacute;xico del cobre. Un problema importante es la adherencia terap&eacute;utica, ya que se debe administrar tres veces al d&iacute;a, separado de las comidas. Si el tratamiento es eficaz, debe descender el cobre libre en plasma y la cupruria, desaparecer el anillo de Kayser-Fleischer y normalizar la anal&iacute;tica hep&aacute;tica. Este tratamiento, de efectos m&aacute;s lentos, se recomienda en los sujetos asintom&aacute;ticos, en familiares presintom&aacute;ticos o una vez que se ha conseguido la depleci&oacute;n de cobre mediante tratamiento quelante (70). El tratamiento con agentes quelantes, como la D-penicilamina o la trientina, induce la p&eacute;rdida por orina de 3 a 8 &mu;mol de cobre al d&iacute;a. Durante el tratamiento con zinc, la cupruria suele ser menor a 1,2 &mu;mol al d&iacute;a. Ninguno de estos tratamientos ha sido evaluado de forma comparativa (71).<i> El tetratiomolibdato am&oacute;nico</i> se recomienda en las formas neurol&oacute;gicas, ya que el empeoramiento neurol&oacute;gico durante este tratamiento quelante es mucho m&aacute;s raro (4%) que con la D-penicilamina (50%) o la trientina (71,72). En la mayor&iacute;a de los estudios, el deterioro neurol&oacute;gico secundario al tratamiento con quelantes es un factor predictivo de mortalidad (72,73). Los<i> antioxidantes</i> (vitamina E) pueden emplearse como adyuvantes. Se recomienda tambi&eacute;n evitar la toma de <i>alimentos</i> ricos en cobre como el h&iacute;gado, marisco, champi&ntilde;ones, chocolate o frutos secos.</font></p>     <p><font face="Verdana" size="2">El <i>trasplante hep&aacute;tico</i> est&aacute; indicado en casos con enfermedad hep&aacute;tica muy avanzada, cuando no se observa respuesta al tratamiento y en los pacientes con hepatitis fulminante, incluida la que puede surgir como consecuencia del abandono de los quelantes (71). Se puede considerar el trasplante de donante vivo familiar, aun cuando posea como m&aacute;ximo una &uacute;nica mutaci&oacute;n. Los resultados del trasplante son excelentes en los pacientes con manifestaciones predominantemente hep&aacute;ticas con una supervivencia anual del 90%, del 83% a los 3 a&ntilde;os y del 70% a los 5 a&ntilde;os (74-76). Los pacientes con manifestaciones neurol&oacute;gicas pueden mejorar tambi&eacute;n tras el trasplante hep&aacute;tico, pero su supervivencia es mucho menor que cuando faltan estos s&iacute;ntomas. Por ello, muchos autores consideran que el trasplante hep&aacute;tico no debe realizarse en pacientes que presentan exclusivamente manifestaciones neurol&oacute;gicas o cuando estas son graves si se asocian con enfermedad hep&aacute;tica (74,77,78). Adem&aacute;s, en estos pacientes, al igual que en los que presentan manifestaciones renales, el empleo de inhibidores de la calcineurina puede seguirse de s&iacute;ntomas neurol&oacute;gicos, a veces graves (79). Los s&iacute;ntomas psiqui&aacute;tricos no suelen desaparecer, por lo que se considera que estos s&iacute;ntomas, al igual que la sintomatolog&iacute;a neurol&oacute;gica grave, pueden constituir una contraindicaci&oacute;n para el trasplante (74). Afortunadamente, los pacientes analizados por el grupo de Rodrigo Agudo no presentaron problemas especiales tras el trasplante hep&aacute;tico y todos los enfermos evolucionaron favorablemente, a pesar de que el 37,9% de ellos presentaba s&iacute;ntomas neurol&oacute;gicos o psiqui&aacute;tricos. El <i>trasplante de hepatocitos</i>, que constituye una esperanza para el futuro, requiere tambi&eacute;n del empleo de inmunosupresores (80). Quiz&aacute; el empleo de c&eacute;lulas madres o de c&eacute;lulas modificadas mediante terapia g&eacute;nica podr&iacute;a reducir los riesgos de la inmunosupresi&oacute;n.</font></p>     <p><font face="Verdana" size="2">Contamos con estudios prometedores de <i>terapia g&eacute;nica</i> realizados en un modelo animal de EW, utilizando ratas Long Evans, en el que se ha logrado la normalizaci&oacute;n de la excreci&oacute;n biliar de cobre y el aumento de la ceruloplasmina s&eacute;rica mediante la introducci&oacute;n del gen ATP7B incorporado a un lentivirus recombinante. Para que la infecci&oacute;n por este virus sea eficaz, es suficiente con que este gen se exprese en el 30 al 50% de los hepatocitos (81,82). Uno de los principales problemas que plantea esta terapia es el car&aacute;cter transitorio de la expresi&oacute;n g&eacute;nica. Ello obliga a la repetici&oacute;n de la infecci&oacute;n con el portador viral. Por ello, se necesita conseguir vectores gen&eacute;ticos capaces de infectar hepatocitos no proliferativos y que expresen de forma prolongada la enzima en la regi&oacute;n celular m&aacute;s adecuada para conseguir una funci&oacute;n &oacute;ptima.</font></p>     <p>&nbsp;</p>     <p><b><font face="Verdana" size="3">Bibliograf&iacute;a</font></b></p>     <!-- ref --><p><font face="Verdana" size="2">1. Wilson SAK. Progressive lenticular degeneration: a familial nervous disease associated with cirrhosis of the liver. Brain 1912; 34: 20-509.</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=5265513&pid=S1130-0108200800080000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p><font face="Verdana" size="2">2. Scheinberg IH, Sternlieb I. Wilson's disease. 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