<?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>0120-548X</journal-id>
<journal-title><![CDATA[Acta Biológica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta biol.Colomb.]]></abbrev-journal-title>
<issn>0120-548X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-548X2011000100002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[ENFERMEDAD DE HUNTINGTON: MODELOS EXPERIMENTALES Y PERSPECTIVAS TERAPÉUTICAS]]></article-title>
<article-title xml:lang="en"><![CDATA[Huntington'disease: Experimentals Models and Therapeutic Perspectives]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SERRANO SÁNCHEZ]]></surname>
<given-names><![CDATA[TERESA]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BLANCO LEZCANO]]></surname>
<given-names><![CDATA[LISETTE]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GARCÍA MINET]]></surname>
<given-names><![CDATA[ROCÍO]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ALBERTI AMADOR]]></surname>
<given-names><![CDATA[ESTEBAN]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[DÍAZ ARMESTO]]></surname>
<given-names><![CDATA[IVÁN]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PAVÓN FUENTE]]></surname>
<given-names><![CDATA[NANCY]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[LORIGADOS PEDRE]]></surname>
<given-names><![CDATA[LOURDES]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GONZÁLEZ FRAGUELA]]></surname>
<given-names><![CDATA[MARÍA ELENA]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MONTERO LEÓN]]></surname>
<given-names><![CDATA[JORGE FELIPE]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MARTÍNEZ MARTÍ]]></surname>
<given-names><![CDATA[LISIS]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ROBINSON AGRAMONTE]]></surname>
<given-names><![CDATA[MARÍA DE LOS ANGELES]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[FRANCIS TURNER]]></surname>
<given-names><![CDATA[LILIANA]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro Internacional de Restauración Neurológica  ]]></institution>
<addr-line><![CDATA[Cuidad de la Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Hospital Clínico Quirúrgico  ]]></institution>
<addr-line><![CDATA[Cuidad de la Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital Clínico Quirúrgico  ]]></institution>
<addr-line><![CDATA[Cuidad de la Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad del Tolima  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>30</day>
<month>04</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>30</day>
<month>04</month>
<year>2011</year>
</pub-date>
<volume>16</volume>
<numero>1</numero>
<fpage>21</fpage>
<lpage>42</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-548X2011000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-548X2011000100002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-548X2011000100002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La enfermedad de Huntington (EH) es un trastorno degenerativo de Weiss de origen hereditario. Hasta el momento no existe un tratamiento efectivo para la enfermedad que inexorablemente después de transcurridos 15 a 20 años, evoluciona hacia incapacidad total o muerte. En este trabajo se revisan las características clínicas y morfológicas de la EH y los modelos experimentales más utilizados para su estudio tomando como fuente, artículos indexados en la base de datos Medline publicados en los últimos 20 años. Se valoran las ventajas y desventajas de estos modelos y su perspectiva para el desarrollo de ensayos clínicos. El consenso de lo reportado plantea que de los modelos tóxicos, los inducidos por neurotoxinas tales como ácido quinolínico parecen ser los más adecuados para reproducir las características neuropatológicas, y por otro lado los modelos genéticos contribuyen con más evidencias al conocimiento del origen etiológico de la enfermedad. Numerosos tratamientos han sido aplicados en el manejo de las manifestaciones clínicas que aparecen en EH, sin poder detener o disminuir las afectaciones que derivan de la pérdida neuronal. La sintomatología clínica ha sido posible reproducirla, al menos en parte, en animales de experimentación lo que ha permitido realizar ensayos terapéuticos. Desde el punto de vista de tratamiento, lo que más promisorio parece ser, la terapia celular con células provenientes de diferentes fuentes y dentro de ellas las no neurales, que implican menor censura ética y mayor factibilidad de obtención para la aplicación en los enfermos. Por otro lado el desarrollo de la tecnología del ARN de interferencia, emerge como una herramienta terapéutica potencial para el tratamiento de EH, así como para responder interrogantes básicas relacionadas con el desarrollo de la enfermedad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Huntington'disease (HD) is a degenerative dysfunction of hereditary origin. Up to date there is not, an effective treatment to the disease which having lapsed 15 or 20 years advances inexorably, in a slow form, toward the total inability or death. This paper reviews the clinical and morphological characteristics of Huntington's disease as well as the experimental models more commonly used t study this disease, having as source the articles indexed in Medline data base, published in the last 20 years. Advantages and disadvantages of all experimental models to reproduce the disease as well as the perspectives to therapeutic assay have been also considered. The consent of outline reported about the toxic models, those induced by neurotoxins such as quinolinic acid, appears to be the most appropiate to reproduce the neuropathologic characteristic of the disease, an genetic models contributing with more evidence to the knowledge of the disease ethiology. Numerous treatments ameliorate clinical manifestations, but none of them has been able to stop or diminish the affectations derived from neuronal loss. At present time it is possible to reproduce, at least partially, the characteristics of the disease in experimentation animals that allow therapy evaluation in HD. From the treatment view point, the more promissory seems to be transplantation of no neuronal cells, taking into account ethical issues and factibility. On the other hand the new technology of interference RNA, emerges as a potential therapeutic tool for treatment in HD, and to respond basic questions on the development of the disease.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Enfermedad de Huntington]]></kwd>
<kwd lng="es"><![CDATA[corteza]]></kwd>
<kwd lng="es"><![CDATA[estriado]]></kwd>
<kwd lng="es"><![CDATA[modelos experimentales]]></kwd>
<kwd lng="en"><![CDATA[Huntington disease]]></kwd>
<kwd lng="en"><![CDATA[cortex]]></kwd>
<kwd lng="en"><![CDATA[striatum]]></kwd>
<kwd lng="en"><![CDATA[animal models.]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">      <P align="center"><font size="4"> ENFERMEDAD DE HUNTINGTON: MODELOS EXPERIMENTALES Y PERSPECTIVAS TERAP&Eacute;UTICAS </font></P >     <p align="center"    >Huntington'disease :   Experimentals Models and Therapeutic Perspectives  </p >     <P   > TERESA SERRANO S&Aacute;NCHEZ<Sup>1</Sup>, Dra.; LISETTE BLANCO LEZCANO<Sup>1</Sup>, DrC; ROC&Iacute;O GARC&Iacute;A MINET<Sup>1</Sup>, M.Sc.; ESTEBAN ALBERTI AMADOR<Sup>1</Sup>, DrC; IV&Aacute;N D&Iacute;AZ ARMESTO<Sup>2</Sup>, Dr.; NANCY PAV&Oacute;N FUENTE<Sup>1</Sup>, DrC;   LOURDES LORIGADOS PEDRE<Sup>1</Sup>, DrC; MAR&Iacute;A ELENA GONZ&Aacute;LEZ   FRAGUELA<Sup>1</Sup>, Dra.; JORGE FELIPE MONTERO LE&Oacute;N<Sup>3</Sup>, Dr.; LISIS   MART&Iacute;NEZ MART&Iacute;<Sup>1</Sup>, M.Sc.; MAR&Iacute;A DE LOS ANGELES ROBINSON   AGRAMONTE<Sup>1</Sup>, DrC; LILIANA FRANCIS TURNER<Sup>4</Sup>, DrC. <Sup>1 </Sup>Centro Internacional de Restauraci&oacute;n Neurol&oacute;gica.   Avenida 25 # 15805 entre 158 y 160. Cubanac&aacute;n, Playa.   C&oacute;digo Postal 11300. Cuidad de la Habana, Cuba. <Sup>2 </Sup>Hospital Cl&iacute;nico Quir&uacute;rgico -Juaqu&iacute;n Albarr&aacute;n-.   Avenida 26. Playa. Cuidad de la Habana, Cuba. <Sup>3 </Sup>Instituto Nacional de Oncolog&iacute;a y Rehabilitaci&oacute;n (INOR). 29 y E.   Vedado. Cuidad de la Habana, Cuba. <Sup>4 </Sup>Universidad del Tolima. Ibagu&eacute;, Tolima, Colombia.   Correspondencia a: Teresa Serrano S&aacute;nchez, Centro Internacional de   Restauraci&oacute;n Neurol&oacute;gica. Avenida 25 # 15805 entre 158 y 160.   Cubanac&aacute;n, Playa. C&oacute;digo Postal 11300. Cuidad de la Habana, Cuba.   Fax: (537) 33 6339 - 33 2420 - 33 6302. Telefax: 33 6028. Tel&eacute;fonos del   CIREN: 271 5353 - 271 5379. <a href="mailto:teresa.serrano@infomed.sld.cu">teresa.serrano@infomed.sld.cu</a> </P >     <P   >Presentado 9 de septiembre de 2010, aceptado 11 de febrero de 2011, correcciones 22 de febrero de 2011. </P > <hr size="1">     <p    > RESUMEN  </p >     <P   > La enfermedad de Huntington (EH) es un trastorno degenerativo de Weiss de origen hereditario. Hasta el momento no existe un tratamiento efectivo para la enfermedad que inexorablemente despu&eacute;s de transcurridos 15 a 20 a&ntilde;os, evoluciona hacia incapacidad total o muerte. En este trabajo se revisan las caracter&iacute;sticas cl&iacute;nicas y morfol&oacute;gicas de la EH y los modelos experimentales m&aacute;s utilizados para su estudio tomando como fuente, art&iacute;culos indexados en la base de datos Medline publicados en los &uacute;ltimos 20 a&ntilde;os. Se valoran las ventajas y desventajas de estos modelos y su perspectiva para el desarrollo de ensayos cl&iacute;nicos. El consenso de lo reportado plantea que de los modelos t&oacute;xicos, los inducidos por neurotoxinas tales como &aacute;cido quinol&iacute;nico parecen ser los m&aacute;s adecuados para reproducir las caracter&iacute;sticas neuropatol&oacute;gicas, y por otro lado los modelos gen&eacute;ticos contribuyen con m&aacute;s evidencias al conocimiento del origen etiol&oacute;gico de la enfermedad. Numerosos tratamientos han sido aplicados en el manejo de las manifestaciones cl&iacute;nicas que aparecen en EH, sin poder detener o disminuir las afectaciones que derivan de la p&eacute;rdida neuronal. La sintomatolog&iacute;a cl&iacute;nica ha sido posible reproducirla, al menos en parte, en animales de experimentaci&oacute;n lo que ha permitido realizar ensayos terap&eacute;uticos. Desde el punto de vista de tratamiento, lo que m&aacute;s promisorio parece ser, la terapia celular con c&eacute;lulas provenientes de diferentes fuentes y dentro de ellas las no neurales, que implican menor censura &eacute;tica y mayor factibilidad de obtenci&oacute;n para la aplicaci&oacute;n en los enfermos. Por otro lado el desarrollo de la tecnolog&iacute;a del ARN de interferencia, emerge como una herramienta terap&eacute;utica potencial para el tratamiento de EH, as&iacute; como para responder interrogantes b&aacute;sicas relacionadas con el desarrollo de la enfermedad. </P >     <P    > Palabras clave:  Enfermedad de Huntington, corteza, estriado, modelos experimentales. </P > <hr size="1">     <p    >ABSTRACT  </p >     <P    > Huntington'disease (HD) is a degenerative dysfunction of hereditary origin. Up to date there is not, an effective treatment to the disease which having lapsed 15 or 20 years advances inexorably, in a slow form, toward the total inability or death. This paper reviews the clinical and morphological characteristics of Huntington's disease as well as the experimental models more commonly used t study this disease, having as source the articles indexed in Medline data base, published in the last 20 years. Advantages and disadvantages of all experimental models to reproduce the disease as well as the perspectives to therapeutic assay have been also considered. The consent of outline reported about the toxic models, those induced by neurotoxins such as quinolinic acid, appears to be the most appropiate to reproduce the neuropathologic characteristic of the disease, an genetic models contributing with more evidence to the knowledge of the disease ethiology. Numerous treatments ameliorate clinical manifestations, but none of them has been able to stop or diminish the affectations derived from neuronal loss. At present time it is possible to reproduce, at least partially, the characteristics of the disease in experimentation animals that allow therapy evaluation in HD. From the treatment view point, the more promissory seems to be transplantation of no neuronal cells, taking into account ethical issues and factibility. On the other hand the new technology of interference RNA, emerges as a potential therapeutic tool for treatment in HD, and to respond basic questions on the development of the disease. </P >     ]]></body>
<body><![CDATA[<P    > Key words:  Huntington disease, cortex, striatum, animal models. </P > <hr size="1">     <p    >INTRODUCCI&Oacute;N </p >     <P   > La enfermedad de Huntington (EH), es una enfermedad neurodegenerativa autos&oacute;mica dominante que fue descrita por George Huntington en 1872 (Huntington, 1909). El comienzo de la enfermedad es lento, se sit&uacute;a en la edad media de la vida, habitualmente entre los 30 y 50 a&ntilde;os. Se manisfiesta por movimientos musculares anormales, entre los cuales, el m&aacute;s frecuente, pero no el &uacute;nico, es corea, y p&eacute;rdida progresiva de funciones cognitivas (Garc&iacute;a de Y&eacute;benes <I>et al.</I>, 1992). Los datos epidemiol&oacute;gicos de la EH se obtienen a trav&eacute;s del estudio de familias afectadas, y se ha demostrado por estudios de prevalencia el origen noreuropeo de la mutaci&oacute;n que conduce a la EH destac&aacute;ndose una densidad de incidencia que va desde 2,5 a 9,95 por cada 100.000 habitantes, lo que indica una prevalencia diferente seg&uacute;n la situaci&oacute;n geogr&aacute;fica (Harper, 1996). Tomando como fuente, art&iacute;culos indexados en la base de datos Medline publicados en los &uacute;ltimos 20 a&ntilde;os, pudimos constatar que desde el punto de vista neuropatol&oacute;gico, hay muerte celular que afecta principalmente al estriado y corteza cerebral. Neuroqu&iacute;micamente en el estriado de pacientes con EH hay disminuci&oacute;n en la concentraci&oacute;n de los neurotrasmisores glutamato y &aacute;cido-&#65533;-amino but&iacute;rico (GABA; Dure <I>et al.</I>, 1991). La causa molecular de la enfermedad es una expansi&oacute;n del cod&oacute;n CAG, en el primer ex&oacute;n, que codifica para una cadena de glutamina de la prote&iacute;na denominada huntingtina, cuya funci&oacute;n es a&uacute;n desconocida. La expansi&oacute;n de poliglutamina representa una causa importante de neurodegeneraci&oacute;n, ya que resulta ser responsable de las alteraciones observadas en otras enfermedades hereditarias, adem&aacute;s de EH (Burright <I>et al.</I>, 1997). </P >     <P   >Los s&iacute;ntomas iniciales se manisfiestan con frecuencia por un cambio de la personalidad, pero los movimientos coreicos pueden ser el primer signo de la enfermedad (Marsden, 1993). Los trastornos mentales iniciales a menudo son sutiles, aunque se pueden encontrar alteraciones de sensibilidad, de conducta e irritabilidad, y tendencia al comportamiento agresivo o sexual no controlado (Buller <I>et al.</I>, 1994). Son frecuentes la depresi&oacute;n y el suicidio entre estos pacientes siempre constituye un riesgo. A medida que la enfermedad progresa, los movimientos coreicos son m&aacute;s intensos y grotescos. Con frecuencia aparece demencia que con el tiempo se vuelve m&aacute;s pronunciada (Marsden, 1993; Buller <I>et al.</I>, 1994; Diamond <I>et al.</I>, 1992). La marcha, habla y uso de manos se hallan afectados. Igualmente, muchos pacientes experimentan rigidez y acinesia crecientes, que llevan a reducci&oacute;n de la corea. La muerte se produce alrededor de los 15 y 20 a&ntilde;os despu&eacute;s del comienzo de la enfermedad (Marsden, 1993) . En general los cuadros cl&iacute;nicos son muy variables (Bruyn y Went, 1986). Los sindromes cl&iacute;nicos m&aacute;s caracter&iacute;sticos son: </P > <UL   type="disc" >   <LI   >Variante cl&aacute;sica: Inicio entre los 30 y 50 a&ntilde;os. Cuadro t&iacute;pico de trastorno motor, cognitivo y de conducta. Progresi&oacute;n hacia la muerte en 20 a&ntilde;os. </LI >   <LI   >Variante senil: Inicio despu&eacute;s de los 55 a&ntilde;os. Trastorno motor con predominio de corea sin deterioro intelectual ni acortamiento de la vida. </LI >   <LI   >Variante juvenil: Inicio antes de los 20 a&ntilde;os. Sindrome acin&eacute;tico r&iacute;gido, con grave deterioro mental y muerte en menos de 15 a&ntilde;os. </LI > </UL >     <p   > EL ESTRIADO FORMA PARTE DE LOS GANGLIOS BASALES (GB)  </p >     <P   > En la <a href="#fig1">Fig. 1</a> se presenta un esquema general del sistema motor, que incluye el lugar que corresponde a los GB. El Estriado (St; caudado y putamen) es una de las estructuras que se encuentra afectada en EH y que forma parte de los GB, es el n&uacute;cleo integrador y principal receptor de las conexiones m&aacute;s importantes provenientes de la corteza cerebral (Barnes, 1983; Alexander y Crutcher, 1990; Graybiel, 1990; DeLong, 1990). Est&aacute; formado por diferentes tipos de c&eacute;lulas neurales, pero las neuronas espinosas de tama&ntilde;o mediano, que utilizan como neurotransmisor GABA (neuronas gaba&eacute;rgicas), representan el 70 % de las neuronas encontradas y son sus principales c&eacute;lulas de proyecci&oacute;n (Alexander y Crutcher, 1990; Scortticati y Micheli, 1998). El resto de los tipos neuronales del St son menos frecuentes e incluyen neuronas con dendritas largas que utilizan como neurotransmisor acetilcolina y que funcionan como interneuronas. En EH, las neuronas que sufren mayor afectaci&oacute;n, son las neuronas espinosas de tama&ntilde;o mediano localizadas en esta estructura. </P >    <p>    <center><a name="fig1"></a><img src="img/revistas/abc/v16n1/v16n1a2f1.jpg"></center></p>     <p    > VISI&Oacute;N ACTUAL DEL CIRCUITO MOTOR  </p >     <P    > El concepto cl&aacute;sico de circuito motor corticosubcortical vertical se ha visto modificado en los &uacute;ltimos a&ntilde;os por la aparici&oacute;n de otras v&iacute;as anat&oacute;micas que intervienen en el control motor. En la actualidad en el control motor se habla de la existencia de circuitos -transversales-, que se establecen entre los n&uacute;cleos integrantes de los GB &oacute; desde el t&aacute;lamo permitiendo la autorregulaci&oacute;n de la actividad neuronal antes de proyectar de nuevo a la corteza motora. Estos circuitos incluyen: </P > <DL   >   <DT   >a. </DT >   <DD   >Circuito Globo p&aacute;lido externo (GPe)-n&uacute;cleo subtal&aacute;mico (NST)-Globo p&aacute;lido interno (GPi): En el existen aferencias gaba&eacute;rgicas del GPe al GPi y aferencias glutamat&eacute;rgicas del NST al GPe, ellas describen un tri&aacute;ngulo que permite la autorregulaci&oacute;n interna de la actividad de los tres n&uacute;cleos. </DD >   <DT   >b. </DT >   <DD   >Circuito GPi-n&uacute;cleo centromediano parafascicular del t&aacute;lamo (CM/Pf)-estriado (STR): El n&uacute;cleo CM/Pf recibe aferencias desde el GPi y proyecta al STR y al NST desde donde se env&iacute;an eferencias al GPi con car&aacute;cter funcional opuesto (GABA&eacute;rgica y glutamat&eacute;rgica respectivamente), estableci&eacute;ndose as&iacute; un sistema de regulaci&oacute;n. </DD > </DL >     ]]></body>
<body><![CDATA[<P    >Y aunque no se define como un circuito transversal se plantea que existen conexiones rec&iacute;procas del NPP (n&uacute;cleo ped&uacute;nculo pontino), con todos los n&uacute;cleos de los GB y de modo relevante con el NST y el GPi, estableci&eacute;ndose as&iacute; otro sistema de regulaci&oacute;n (Rodriguez <I>et al.</I>, 2004). </P >     <p    > BASES NEURALES DE LAS ALTERACIONES MOTORAS EN LA EH  </p >     <P    > Las neuronas espinosas (NE) de tama&ntilde;o medio son las m&aacute;s afectadas. La proyecci&oacute;n de estas neuronas se efect&uacute;a a trav&eacute;s de dos v&iacute;as, denominadas directa e indirecta (Gerfen, 1992). En la primera, &eacute;stas neuronas del estriado portadoras de sustancia P y GABA ejercer&iacute;an su acci&oacute;n inhibitoria sobre neuronas del p&aacute;lido interno y las de la <I>pars reticulata</I>, de la SN (con GABA como neurotrasmisor principal), permitiendo as&iacute; la acci&oacute;n del t&aacute;lamo sobre la corteza. Al perderse la acci&oacute;n inhibitoria de estas NE sobre el p&aacute;lido interno y SN <I>pars reticulata</I>, estos n&uacute;cleos podr&iacute;an ejercer la suya libremente sobre el t&aacute;lamo. Se presupone que este mecanismo conducir&iacute;a as&iacute; a la bradicinesia, que se observa en algunos casos de EH (Gerfen, 1992). La v&iacute;a indirecta implicar&iacute;a a un circuito algo m&aacute;s complejo. Las NE encefal&iacute;nicas proyectan desde el estriado su acci&oacute;n inhibidora sobre otro n&uacute;cleo inhibidor, el p&aacute;lido externo, cuya activaci&oacute;n inhibe al subt&aacute;lamo, este n&uacute;cleo glutamat&eacute;rgico estimula al p&aacute;lido interno y SN <I>pars reticulata</I>, permiti&eacute;ndoles ejercer su acci&oacute;n inhibidora sobre el t&aacute;lamo. Se supone que en la EH se producir&iacute;a una situaci&oacute;n inversa, la p&eacute;rdida de las NE impedir&iacute;a ejercer la acci&oacute;n inhibitoria del estriado sobre el p&aacute;lido externo, el cual podr&iacute;a inhibir libremente al subt&aacute;lamo, este dejar&iacute;a as&iacute; de estimular al p&aacute;lido interno y SN <I>pars reticulata</I>, quedando el t&aacute;lamo libre de esta influencia inhibitoria, apareciendo entonces corea (Reinier <I>et al.</I>, 1998; Storey y Beal, 1993). </P >     <p    > BASES MOLECULARES Y PATOG&Eacute;NICAS DE LA EH  </p >     <P    > En el a&ntilde;o 1993 el grupo de investigaci&oacute;n colaborativo de la enfermedad de Huntington (The Huntigton' Disease Collaborative Research Group, 1993) descubri&oacute; el origen gen&eacute;tico de la enfermedad la cual es autos&oacute;mica dominante con penetrancia completa, encontr&aacute;ndose asociada a una repetici&oacute;n del triplete de nucle&oacute;tidos CAG en la regi&oacute;n que codifica el gen de huntingtina (Laird, 1990). En la poblaci&oacute;n normal los trinucle&oacute;tidos de CAG est&aacute;n repetidos en un n&uacute;mero menor de 30 repeticiones. En el caso de los enfermos, existe un n&uacute;mero de repeticiones mayor de 36 llegando a hacer en algunos casos superiores a 100 (McDonald y Gusella, 1996). Esta mutaci&oacute;n consiste en la inserci&oacute;n de m&uacute;ltiples copias de dicho trinucle&oacute;tido en diferentes regiones de un gen localizado en el brazo corto del cuarto par de cromosomas, espec&iacute;ficamente en el gen IT15. Este cromosoma es el encargado de codificar la prote&iacute;na huntingtina la cual se expresa no s&oacute;lo en cerebro sino tambi&eacute;n en diferentes tejidos. Debido a la mutaci&oacute;n gen&eacute;tica, en los pacientes con EH la huntingtina es sintetizada con un exceso de glutamina, lo cual contribuye a que la misma se agregue formando complejos insolubles con ubiquitina y otras prote&iacute;nas fibrilares, apareciendo de manera caracter&iacute;stica, como cuerpos de inclusi&oacute;n en el n&uacute;cleo (McDonald y Gusella, 1996; Imarisio <I>et al.</I>, 2008). Aunque su funci&oacute;n permanece desconocida se sabe que su uni&oacute;n a estas prote&iacute;nas pudiera estar asociada a la funci&oacute;n con la cual ellas est&aacute;n relacionadas: trasmisi&oacute;n de se&ntilde;ales neuronales y regulaci&oacute;n de la muerte neuronal apopt&oacute;tica (Alexi <I>et al.</I>, 2000; Beal <I>et al.</I>, 1994a). Se ha reportado que el dep&oacute;sito de esta prote&iacute;na anormal provoca en etapas tempranas de la enfermedad, muerte de neuronas de proyecci&oacute;n gaba&eacute;rgicas espinosas de talla media que expresan encefalinas (Kowall <I>et al.</I>, 1987). </P >     <P    >El descubrimiento de esta prote&iacute;na ha abierto una nueva perspectiva en la patogenia y tratamiento de la EH, aunque los mecanismos responsables de la muerte celular selectiva y p&eacute;rdida de neuronas no son del todo conocidos hasta el momento (<I>The Huntigton' Disease Collaborative Research Group</I>, 1993; Imarisio <I>et al.</I>, 2008). </P >     <P    >Los principales hallazgos neuropatol&oacute;gicos de la EH se encuentran localizados en el estriado, donde se ha evidenciado p&eacute;rdida de neuronas de proyecci&oacute;n, unido a una preservaci&oacute;n de interneuronas espinales grandes (Reinier <I>et al.</I>, 1998).</P >     <P    > Para explicar la patogenia de la EH han sido implicados diversos mecanismos: excitot&oacute;xicos, metab&oacute;licos y de estr&eacute;s oxidativo (Tkac <I>et al.</I>, 2001; Browne, 1999). </P >     <P    >El da&ntilde;o excitot&oacute;xico es producido por la sobreactividad local de amino&aacute;cidos excitatorios (AAE) sobre sus receptores, lo cual conduce a despolarizaci&oacute;n sostenida que provoca muerte celular selectiva. Glutamato u otros AAE end&oacute;genos que act&uacute;an sobre varios tipos de receptores glutamat&eacute;rgicos, pudieran estar involucrados en la patogenia de la EH. (Spencer <I>et al.</I>, 1987; Biscoe <I>et al.</I>, 1975). Estos receptores glutamat&eacute;rgicos son de dos tipos: metabotr&oacute;picos y ionotr&oacute;picos. Los metabotr&oacute;picos son aquellos que se encuentran ligados a prote&iacute;nas G e incluyen L-AP4 (&aacute;cido L-2-amino-4-fosforopro-pi&oacute;nico) y los ionotr&oacute;picos son canales i&oacute;nicos e incluyen a los NMDA (N-metil-D-aspartato), los ka&iacute;nato y los AMPA (&aacute;cido-amino-3-hidroxi-5-metil-4-isoxasolpropi&oacute;nico; Nakanishi, 1992; Schoepp y Con, 1993). Aunque todos pueden mediar muerte celular, tanto apopt&oacute;tica como necr&oacute;tica, desencadenada por mecanismos excitot&oacute;xicos, son los del tipo NMDA los que tienen una acci&oacute;n m&aacute;s relevante, y los que se encuentran m&aacute;s ampliamente distribuidos en el cerebro (Coyle y Puttfarcken, 1993; Giffard <I>et al.</I>, 1992).</P >     <P    > La neurotoxicidad por amino&aacute;cidos excitatorios, no depende solamente de los niveles end&oacute;genos de los posibles compuestos neurot&oacute;xicos, ni del grado de eficacia de sus mecanismos de re-captaci&oacute;n, sino tambi&eacute;n de otros factores que modulan la respuesta, y por tanto la actividad neuronal a nivel del receptor o post-receptor. A nivel del receptor se han descrito compuestos end&oacute;genos que inhiben de forma competitiva el receptor NMDA (N-Metil-D-Aspartato) y sustancias que lo modifican alost&eacute;ricamente aumentando su afinidad por su ligando (Mayer <I>et al.</I>, 1984; Wong <I>et al.</I>, 1986; Lodge y Golingridge, 1990; Kemp <I>et al.</I>, 1988). A nivel post-receptor, el efecto de amino&aacute;cidos excitatorios puede ser modificado por manipuladores de canales i&oacute;nicos, segundos mediadores, activadores o inhibidores de prote&iacute;nas quinasas, factores de crecimiento y otros f&aacute;rmacos (Novelli <I>et al.</I>, 1988; Weiss <I>et al.</I>, 1990).</P >     ]]></body>
<body><![CDATA[<P    > Estudios en cultivo de tejido indican que la muerte neuronal mediada por receptores glutamat&eacute;rgicos, puede seguir dos v&iacute;as diferentes: una forma aguda y una retardada (Beal <I>et al.</I>, 1994a; Beal, 1996). La neurotoxicidad aguda se caracteriza por una dilataci&oacute;n de la c&eacute;lula en presencia de agonistas glutamet&eacute;rgicos, que trae como consecuencia la lisis osm&oacute;tica de la neurona (necrosis). Los dos iones responsables de la entrada masiva de agua en este caso son Na<Sup>+ </Sup>y Cl<Sup>-</Sup>. La degeneraci&oacute;n neuronal retardada es mediada por mecanismos dependientes de Ca<Sup>2+</Sup>. Este puede mediar muerte celular por varios mecanismos que incluyen activaci&oacute;n de prote&iacute;nas quinasas, fosfolipasas A2, &oacute;xido n&iacute;trico sintetasa, proteasas, generaci&oacute;n de radicales libres, da&ntilde;o mitocondrial e inhibici&oacute;n de la s&iacute;ntesis de prote&iacute;nas (Coyle y Puttfarcken, 1993; Giffard <I>et al.</I>, 1992; Beal, 1996; Steller, 1995; Mitchell <I>et al.</I>, 1994; Quintanilla y Johnson, 2009). La inyecci&oacute;n intraestriatal de agonistas de estos receptores reproduce muchas de las caracter&iacute;sticas neuroqu&iacute;micas y neuropatol&oacute;gicas de la EH. </P >     <P    >Con relaci&oacute;n a los mecanismos metab&oacute;licos planteados en la patogenia de la EH, existe una hip&oacute;tesis en la que se a&uacute;nan el conocimiento de los mecanismos excitot&oacute;xicos mediados por receptores NMDA con defectos en el metabolismo energ&eacute;tico detectados en la EH (Beal, 1992; Oliveira, 2010). Seg&uacute;n esta hip&oacute;tesis los mecanismos excitatorios contribuir&iacute;an a muerte neuronal de c&eacute;lulas con dificultades metab&oacute;licas. </P >     <P    >Relacionado con estr&eacute;s oxidativo se plantea que la cadena respiratoria mitocondrial genera radicales libres que alteran la funci&oacute;n celular normal. El &oacute;xido n&iacute;trico producido por la &oacute;xido n&iacute;trico sintetasa, se ha detectado en interneuronas no espinosas de talla media a grande del estriado, donde act&uacute;a como neurotrasmisor. Adem&aacute;s puede generar radicales hidroxilo a partir del ani&oacute;n super&oacute;xido (Deckel, 2001; Tasset <I>et al.</I>, 2009). Estos datos ponen de manifiesto que el estr&eacute;s oxidativo, tiene un papel relevante en el curso y evoluci&oacute;n de la EH, asoci&aacute;ndose a distintos estadios de la enfermedad, por lo que puede utilizarse como marcador-pron&oacute;stico y de la efectividad de tratamiento, as&iacute; como constituir un foco de inter&eacute;s para el desarrollo de nuevas estrategias terap&eacute;uticas. Finalmente existe una nueva v&iacute;a patog&eacute;nica que involucra al sistema inmunol&oacute;gico del individuo, donde existe una activaci&oacute;n anormal de la microglia y macr&oacute;fagos lo que sugiere una disfunci&oacute;n inmune que juega un papel importante en la patolog&iacute;a cerebral (Bjorkqvist <I>et al.</I>, 2008) </P >     <p   > MODELOS EXPERIMENTALES EN LA EH  </p >     <P   > Los estudios realizados para aumentar el conocimiento de la etiolog&iacute;a de la EH, conjuntamente con la constante b&uacute;squeda de alternativas terap&eacute;uticas, ha hecho incuestionable la importancia del uso de la experimentaci&oacute;n animal. Aunque la EH no se manifiesta en los animales de manera espont&aacute;nea, se han desarrollado modelos experimentales de la enfermedad que han ayudado a estudiar los mecanismos involucrados en la patogenia de la misma, permitiendo desarrollar estrategias terap&eacute;uticas (Ferrante, 2009; Perry <I>et al.</I>, 2010). No existe un modelo experimental &uacute;nico que satisfaga completamente los requerimientos de similitud con la EH en cuanto a fenomenolog&iacute;a cl&iacute;nica, aspecto histol&oacute;gico y gen&eacute;tico. Sin embargo, se sabe desde hace m&aacute;s de dos d&eacute;cadas, que la inyecci&oacute;n intracerebral de algunas neurot&oacute;xinas producen lesiones estriatales que guardan alguna semejanza con las lesiones histol&oacute;gicas observadas en la EH (DiFiglia, 1990). En general se han descrito dos tipos de modelos hom&oacute;logos para la EH: t&oacute;xicos y trang&eacute;nicos. </P >     <p   > MODELOS T&Oacute;XICOS  </p >     <P   > La muerte neuronal excitot&oacute;xica lenta puede producirse como consecuencia de un defecto en el metabolismo oxidativo. Las interrupciones en la s&iacute;ntesis de ATP pueden conducir a despolarizaci&oacute;n neuronal parcial con activaci&oacute;n de receptores NMDA, lo cual provocar&iacute;a da&ntilde;o neuronal excitot&oacute;xico secundario (Palfi <I>et al.</I>, 1996; La Fontaine <I>et al.</I>, 2000; Beal <I>et al.</I>, 1993a). </P >     <p    > MODELOS EXPERIMENTALES DE LA EH BASADOS EN EXCITOTOXICIDAD  </p >     <P    > Se ha descrito que los modelos de excitotoxicidad han sido utilizados con mayor frecuencia. Los mecanismos de excitotoxicidad est&aacute;n basados en la sobreexcitaci&oacute;n de las neuronas como resultado de estimulaci&oacute;n propagada y continua de receptores a amino&aacute;cidos excitadores, lo que produce alteraciones serias en la fisiolog&iacute;a de las neuronas, conduci&eacute;ndolas a muerte celular (Olney <I>et al.</I>, 1971). T&oacute;xinas con las que pueden ser producidos estos modelos: </P >    <p>    ]]></body>
<body><![CDATA[<center><a name="fig2"></a><img src="img/revistas/abc/v16n1/v16n1a2f2.jpg"></center></p> <DL   >   <DT   >a. </DT >   <DD   >&Aacute;cido ka&iacute;nico (AK). Es un derivado de algas, agonista del receptor ka&iacute;nato (Coyle y Schwarcz, 1976; Mason y Fibriger, 1978). En 1976 Coyle y Schwarcz establecieron el empleo de AK para reproducir las caracter&iacute;sticas histol&oacute;gicas, conductuales y bioqu&iacute;micas de la EH, produciendo una lesi&oacute;n de neuronas gaba&eacute;rgicas y colin&eacute;rgicas sin alterar a neuronas dopamin&eacute;rgicas. La actividad de algunas enzimas como glutamato descarboxilasa (GAD) y colina acetil transferasa (ChAT) disminuyeron de forma similar a lo encontrado en la enfermedad. Sin embargo, a diferencia de la EH, se observ&oacute; disminuci&oacute;n significativa en los niveles de somatostatina y neurop&eacute;ptido Y (Coyle y Schwarcz, 1976). </DD >   <DT   >b. </DT >   <DD   >&Aacute;cido ibot&eacute;nico (IBO). Es un an&aacute;logo r&iacute;gido del glutamato (Barrer y Dunnett, 1994). En 1990, Hantraye <I>et al.</I>, propusieron al IBO como inductor de un modelo experimental de la EH, basado en la toxicidad de este &aacute;cido en el hipocampo de rata. Cuando se administr&oacute; en el cuerpo estriado de bovinos, se observ&oacute; proliferaci&oacute;n astroc&iacute;tica y p&eacute;rdida de fibras colin&eacute;rgicas sin alteraci&oacute;n de fibras dopamin&eacute;rgicas. Hubo disminuci&oacute;n de metaencefalinas acompa&ntilde;&aacute;ndose de alteraciones conductuales tales como: corea, diston&iacute;a y asimetr&iacute;a postural. No obstante, tambi&eacute;n se observaron diferencias conductuales que limitan la reproducibilidad del modelo, siendo mejor alternativa que el del AK, pero con ciertas limitaciones (Hantraye <I>et al.</I>, 1990). </DD >   <DT   >c. </DT >   <DD   >&Aacute;cido quinol&iacute;nico (AQ). Este derivado del metabolismo del &aacute;cido kinur&eacute;nico (que proviene de una rama del metabolismo del tript&oacute;fano), reproduce en parte los cambios bioqu&iacute;micos y neuropatol&oacute;gicos de la EH, demostrando que el AQ es capaz de inducir lesiones neuronales cuya distribuci&oacute;n es mucho m&aacute;s parecida a la que produce el AK en el modelo de EH, ya que afecta a neuronas espinosas respetando relativamente a las no espinosas. Entre los cambios m&aacute;s significativos desde el punto de vista neuroqu&iacute;mico se destacan la reducci&oacute;n severa de las concentraciones de GABA en c&eacute;lulas estriatales, reducci&oacute;n severa de la actividad GAD y gliosis estriatal (Beal <I>et al.</I>, 1986; Beal <I>et al.</I>, 1991). Se ha demostrado que despu&eacute;s de la administraci&oacute;n de AQ en el estriado, se producen niveles de somatostatina, neurop&eacute;ptido Y, sustancia P, vasopresina, GABA y dopamina muy similares a los que se observan en la EH por lo que ha sido considerado como el mejor modelo experimental. En la <a href="#tabla1">Tabla 1</a>, se indican los principales cambios de estas sustancias neuroactivas en la EH y, en los diferentes modelos experimentales de la enfermedad. </DD > </DL >    <p>    <center><a name="tabla1"></a><img src="img/revistas/abc/v16n1/v16n1a2t1.jpg"></center></p>     <P    >Conductualmente, el AQ produce hiperactividad locomotora y alteraciones del aprendizaje y la memoria. Con este conocimiento, se lleg&oacute; a proponer al AQ como el principal agente etiol&oacute;gico en la EH, y que las lesiones provocadas por concentraciones submicromolares de esta toxina pueden ser bloqueadas por MK-801, un antagonista no competitivo de receptores NMDA sugiriendo que las alteraciones observadas en los enfermos, podr&iacute;an estar mediadas por excitaci&oacute;n de estos receptores (Albin <I>et al.</I>, 1990). </P >     <P   >MODELOS EXPERIMENTALES DE LA EH BASADOS EN LA ALTERACI&Oacute;N DEL METABOLISMO ENERG&Eacute;TICO. </P >     <P   >La teor&iacute;a de la excitotoxicidad explica el mecanismo de muerte neuronal en la EH y en otras enfermedades neurodegenerativas como una primera causa de muerte neuronal,pero una posible explicaci&oacute;n de la toxicidad del glutamato podr&iacute;a ser tambi&eacute;n d&eacute;ficit en la producci&oacute;n de energ&iacute;a mitocondrial (Albin y Greenmyre, 1992; Ankacrona <I>et al.</I>, 1995). Por lo tanto se hipotetiz&oacute; que alteraciones en la fosforilaci&oacute;n oxidativa pueden ser el d&eacute;ficit primario que predispone a la degeneraci&oacute;n neuronal secundaria a la toxicidad por glutamato (Beal <I>et al.</I>, 1993b). T&oacute;xina con la que puede ser producido este tipo de alteraci&oacute;n metab&oacute;lica: &Aacute;cido 3-nitropropi&oacute;nico (3-NP; inhibidor del complejo II de la cadena respiratoria mitocondrial). El mecanismo de da&ntilde;o de esta toxina es la inhibici&oacute;n de succinato deshidrogenasa, enzima que juega un papel central en la cadena de transporte de electrones y en el ciclo de &aacute;cidos tricarbox&iacute;licos. La administraci&oacute;n de dosis bajas de &aacute;cido 3-NP produce atrofia estriatal selectiva (Borlongan <I>et al.</I>, 1995; T&uacute;nez y Santamar&iacute;a, 2009). Se cree que el da&ntilde;o selectivo causado por 3-NP en ciertas regiones del cerebro est&aacute; directamente relacionado con la tasa metab&oacute;lica y la densidad de receptores NMDA de cada regi&oacute;n (Hamilton y Gould, 1987). </P >     <P   >El modelo del 3-NP ha sido propuesto como una alternativa para producir lesiones similares a las de la EH, ya que por inhibici&oacute;n irreversible del ciclo del &aacute;cido c&iacute;trico mitocondrial se produce disminuci&oacute;n del ATP y elevaci&oacute;n de las concentraciones de lactato (Beal <I>et al.</I>, 1993a; Gould y Gustine, 1982; Beal, 1994b). Adem&aacute;s se han encontrado niveles bajos de glutamato y da&ntilde;o en el metabolismo energ&eacute;tico oxidativo como los observados en pacientes con desordenes neurodegenerativos incluyendo EH (Gould y Gustine, 1982; Zorumski y Olney, 1993). Teniendo presente las limitaciones de este modelo (como son el salto filogen&eacute;tico, no expresar la prote&iacute;na mutada y tener un efecto autolimitado a la biodisponibilidad del t&oacute;xico), es importante que este agente es capaz de reproducir, dependiendo de la dosis y del tiempo de suministro, disfunciones motoras, de aprendizaje y lesiones estriatales que mimetizan alteraciones histol&oacute;gicas y neuroqu&iacute;micas de EH (T&uacute;nez y Santamar&iacute;a, 2009). </P >     <P   >Este modelo se ha combinado con el de excitotoxicidad pues se sabe que el efecto neurot&oacute;xico del 3-NP es potenciado por agonistas NMDA y disminuido por el pretratamiento con antagonistas de este subtipo de receptor glutamat&eacute;rgico. </P >     <p   > MODELOS GEN&Eacute;TICOS  </p >     <P   > Modelos experimentales basados en el defecto gen&eacute;tico de la EH. Hay dos categor&iacute;as de modelos gen&eacute;ticos: trang&eacute;nicos y <I>knock-in</I>. </P >     ]]></body>
<body><![CDATA[<P   >Los transg&eacute;nicos resultan de la inserci&oacute;n al azar en el genoma del rat&oacute;n, de una porci&oacute;n del gen de huntingtina humana, que contiene repeticiones de tripletes CAG expendidas en el locus IT15, YAC mutante completo para huntingtina etc., todos ellos muy &uacute;tiles en el estudio de la EH. La expresi&oacute;n de ella puede conducirse por diferentes promotores. En los modelos <I>knock-in</I>, una porci&oacute;n del gen de huntingtina humana se introduce en el locus gen&eacute;tico de huntingtina del rat&oacute;n en el cromosoma 4. El promotor de huntingtina ex&oacute;geno promueve la expresi&oacute;n y producci&oacute;n de la prote&iacute;na mutada, de manera espacial y temporal (Kuhn <I>et al.</I>, 1995; Heng, 2008; Ramaswamy <I>et al.</I>, 2007). </P >     <P   >Se ha demostrado que en el estudio del modelo transg&eacute;nico, en el cual se provoca una expansi&oacute;n de las repeticiones CAG en el locus IT15, se desarrolla un fenotipo de alteraciones neurol&oacute;gicas similares a los s&iacute;ntomas motores observados en la EH (Bates <I>et al.</I>, 1997), representando el modelo m&aacute;s cercano de la misma pues su etiolog&iacute;a es debida directamente a la misma mutaci&oacute;n humana. Sin embargo, de manera sorprendente los efectos del trasplante neural intraestriatal en estos animales no son similares a los observados en los modelos de lesi&oacute;n neurot&oacute;xica. Aunque se ha podido constatar que estos trasplantes sobreviven en el estriado hospedero, sus efectos conductuales fueron muy peque&ntilde;os, particularmente en aquellos animales con deficiencia neurol&oacute;gica profunda (Dunnett <I>et al.</I>, 1998). </P >     <P   >Los criterios neuropatol&oacute;gicos utilizados para el diagn&oacute;stico de la EH son muy complejos e incluyen una secuencia de caracter&iacute;sticas cl&iacute;nicas y neuroanat&oacute;micas. Los mode-los animales no reproducen en su totalidad toda esta constelaci&oacute;n de s&iacute;ntomas naturales o patol&oacute;gicos que aparecen en la enfermedad humana, por lo tanto, la valoraci&oacute;n de las similitudes y diferencias que aportan cada uno de estos modelos (Vonsattel, 2008; Ehrnhoefer <I>et al.</I>, 2009), nos ayudar&aacute; a determinar cual de ellos debe ser utilizado en una investigaci&oacute;n dada, seg&uacute;n la respuesta que deseamos obtener en correspondencia con los objetivos planteados para su interpretaci&oacute;n. </P >     <P   >F&aacute;rmaco-terap&eacute;utica actual en la EH. No existe tratamiento curativo para estos enfermos. Hasta la fecha todos los tratamientos establecidos se limitan a la mejor&iacute;a de s&iacute;ntomas que aparecen durante la enfermedad. Un gran n&uacute;mero de medicamentos sirven para tratar alteraciones del movimiento y trastornos psicol&oacute;gicos tales como: corea, psi-cosis y depresi&oacute;n. A pesar de que la mayor&iacute;a de estos medicamentos pueden ser &uacute;tiles en el manejo de la EH, no existe a&uacute;n ninguno que detenga o revierta el proceso ya establecido. Estos f&aacute;rmacos se administran en dosis crecientes hasta que se controla la corea. Tambi&eacute;n ayudan a controlar las complicaciones mentales, que con frecuencia son muy angustiantes para las personas que padecen esta enfermedad (Feigin <I>et al.</I>, 1995; Kieburtz <I>et al.</I>, 1996; Murman <I>et al.</I>, 1997). </P >     <P   >En la b&uacute;squeda de nuevos tratamientos, se ha seguido investigando sobre el comienzo y progresi&oacute;n de la enfermedad, as&iacute; como el papel de la funci&oacute;n mitocondrial y excitotoxicidad, que han permitido llevar a cabo numerosos estudios de terap&eacute;utica experimental (Feigin, 1998). Por otro lado, el conocimiento de cambios neuroendocrinos vistos en modelos de roedores, ha dado informaci&oacute;n de mecanismos cr&iacute;ticos, para el desarrollo de nuevas estrategias de tratamiento, especialmente en aquellas intervenciones que se realizan en etapas tempranas de la enfermedad, modificando la progresi&oacute;n natural de esta (Peters&eacute;n, 2009). La v&iacute;a patog&eacute;nica que involucra al sistema inmunol&oacute;gico del individuo, pudiera ser otro blanco terap&eacute;utico en la b&uacute;squeda de la cura de la enfermedad (Bjorkqvist <I>et al.</I>, 2008). </P >     <P   >Terap&eacute;uticas potenciales para la EH. Teniendo en cuenta los resultados encontrados en la experimentaci&oacute;n animal, durante aproximadamente 20 a&ntilde;os y la ausencia de una farmacoterapia efectiva, es que se ha iniciado la investigaci&oacute;n cl&iacute;nica del trasplante de tejido neural fetal. En 1994 se crea el grupo <I>European Networt for striatal Transplantation in Huntington's Disease </I>(Equivalente al grupo NECTAR para el trasplante en personas con enfermedad de Parkinson), para el trasplante estriatal en personas con EH, y paralelo a esto se desarrolla una prueba de evaluaci&oacute;n para dichos pacientes previo a recibir el trasplante (Quinn <I>et al.</I>, 1996). </P >     <P   >Trasplante de c&eacute;lulas neurales. En la d&eacute;cada de 1980 hubo un incremento en las terapias dirigidas a contrarrestar las alteraciones presentes en etapas tempranas de la EH con el uso de trasplante de tejido neural fetal como un m&eacute;todo terap&eacute;utico. Esta terapia comenz&oacute; mucho m&aacute;s tarde en personas que sufren de EH que en aquellos aquejados de enfermedad de Parkinson. El trasplante de tejido neural fetal constituye una alternativa de tratamiento para la EH, a la que se le ha prestado atenci&oacute;n, conjuntamente con el desarrollo de t&eacute;cnicas de cultivo de tejido de c&eacute;lulas neuronales viables para el trasplante (Kopyoy <I>et al.</I>, 1998). </P >     <P   >El primer trasplante neural en pacientes con EH fue realizado por Madrazo <I>et al.</I>, en 1990 (Madrazo <I>et al.</I>, 1991) y en 1991 por Sramba <I>et al.</I>, 1992, aunque en este &uacute;ltimo caso s&oacute;lo fue experimental, posteriormente esta t&eacute;cnica se mantuvo detenida, para comenzar a ser utilizada nuevamente en un gran n&uacute;mero de personas, cuatro a&ntilde;os m&aacute;s tarde. Este programa de trasplante neural fue iniciado y seguido por otros pa&iacute;ses como por ejemplo Francia (Bachoud-Levi <I>et al.</I>, 2000), y Estados Unidos (Freeman <I>et al.</I>, 2000), donde fueron tratados varios pacientes. </P >     <P   >Pudiera resultar muy beneficioso el hecho de poder generar tejido neural humano <I>in vitro</I>. En los momentos actuales se ha establecido que las c&eacute;lulas madre embrionarias de blastocistos de rat&oacute;n pueden ser expandidas en cultivo y por tanto lograr que se diferencien en un amplio rango de tejidos, incluyendo c&eacute;lulas neurales y gliales. En otros estudios se ha podido obtener c&eacute;lulas madre neurales que han sido aisladas tanto de cerebro de roedores adultos como de aquellos que se encuentran en desarrollo (Svendsen y Smith, 1999) y que han resultado ser apropiadas principalmente en terapias de reemplazo celular (Muller <I>et al.</I>, 2006). </P >     <P   >A pesar de lo antes expuesto, donde se evidencia la existencia de trabajos que apoyan los efectos positivos de trasplantar c&eacute;lulas, otros hablan de efectos negativos encontrados a largo plazo en el tejido trasplantado, lo que trae consigo criterios controversiales, de si es beneficioso o no uso de estas c&eacute;lulas en estos pacientes, como fue demostrado por Cicchetti <I>et al.</I>, cuando evidenci&oacute; la presencia de mecanismos inflamatorios y excitot&oacute;xicos que acarrearon degeneraci&oacute;n neuronal de los trasplantes realizados en pacientes con HD (Cicchetti <I>et al.</I>, 2009), y en el mismo a&ntilde;o la demostraci&oacute;n por Dirk Keene <I>et al.</I>, de la aparici&oacute;n de complicaciones tard&iacute;as debidas a un crecimiento excesivo en la zona del trasplante que result&oacute; ser cr&iacute;tica para estructuras del sistema nervioso central (Keene <I>et al.</I>, 2009). </P >     ]]></body>
<body><![CDATA[<P   >Opinamos que la consolidaci&oacute;n de la terapia celular como tratamiento alternativo en la EH, sigue siendo una esperanza de vida para personas con esta enfermedad ya que tiene como premisa la existencia de una fuente segura de c&eacute;lulas. En estos momentos las c&eacute;lulas neurales fetales confrontan importantes cuestiones t&eacute;cnicas y &eacute;ticas que limitan su obtenci&oacute;n. Por esta raz&oacute;n la comunidad cient&iacute;fica esta enfrascada en la b&uacute;squeda de fuentes celulares alternativas para el trasplante (Fink <I>et al.</I>, 2000), c&eacute;lulas encapsuladas por ingenier&iacute;a gen&eacute;tica que secreten factores tr&oacute;ficos (Emerich, 1997), y fuentes no neurales con estos mismos prop&oacute;sitos. Se ha determinado que estas otras fuentes celulares no nerviosas tienen un alto potencial para el trasplante siendo &uacute;tiles en el autotrasplante, tanto en terapia g&eacute;nica como celular (Azizi <I>et al.</I>, 1999; Kim, 2008; Clelland <I>et al.</I>, 2008; Martin <I>et al.</I>, 2008) </P >     <P   >Trasplante de c&eacute;lulas no neurales. Existen diversas fuentes de c&eacute;lulas no neurales que pueden ser utilizadas en el trasplante dentro de ellas se destaca las provenientes de la m&eacute;dula &oacute;sea, que han sido utilizadas tambi&eacute;n en la reparaci&oacute;n del da&ntilde;o en el sistema nervioso central (Parr <I>et al.</I>, 2007; Scolding <I>et al.</I>, 2008). </P >     <P   >Potencialidades de las c&eacute;lulas de medula &oacute;sea para ser utilizadas como una fuente alternativa en el trasplante de pacientes con enfermedades neurol&oacute;gicas. La m&eacute;dula &oacute;sea adulta (MOA) es de muy f&aacute;cil acceso y es una fuente rica de c&eacute;lulas progenitoras y c&eacute;lulas madre (Prockop, 1997). Un n&uacute;mero creciente de las &uacute;ltimas publicaciones han mostrado que c&eacute;lulas madre de MOA son capaces de generar fenotipo neural tanto in vitro (S&aacute;nchez-Ramos <I>et al.</I>, 2000; Woodbury <I>et al.</I>, 2000) como in vivo despu&eacute;s del trasplante (Brazelton <I>et al.</I>, 2000; Mezey <I>et al.</I>, 2000). Las c&eacute;lulas derivadas de MOA han sido utilizadas de manera exitosa para el trasplante en animales que han sufrido un da&ntilde;o cerebral traum&aacute;tico (Manhood <I>et al.</I>, 2001) y en la isquemia estriatal para reducir el d&eacute;ficit motor que aparece despu&eacute;s del da&ntilde;o (Zhao <I>et al.</I>, 2002). M&aacute;s recientemente, se ha utilizado el trasplante de c&eacute;lulas de MOA aut&oacute;loga para revertir el d&eacute;ficit cognitivo observado en un modelo animal de EH (Lescaudron, 2003). En este trabajo se pudo demostrar que el trasplante de c&eacute;lulas de MOA es capaz de reducir el da&ntilde;o cognitivo en este modelo de EH. </P >     <P   >En este sentido, nuestra atenci&oacute;n se ha enfocado en el uso del trasplante de CMO como estrategia de tratamiento para personas portadoras de esta entidad cl&iacute;nica. Es por ello que nuestros trabajos actuales se han encaminado a evaluar si las CMO al ser trasplantadas dentro del estriado lesionado con AQ son capaces de sobrevivir y modificar las alteraciones conductuales presentes en el modelo de Huntington en ratas. </P >     <P   >Estos resultados son prometedores, porque el uso de c&eacute;lulas madre adulta aut&oacute;loga minimiza el riesgo de rechazo inmunol&oacute;gico y al mismo tiempo evita problemas &eacute;ticos que existen con el uso de trasplante de tejido fetal como terapia para enfermedades neurodegenerativas. </P >     <P   >Terapia neuroprotectora. La neuroprotecci&oacute;n ha sido uno de los pilares explorados en el tratamiento de la EH, donde conociendo el requerimiento tr&oacute;fico de la poblaci&oacute;n neuronal afectada, se puede inducir una respuesta tr&oacute;fica end&oacute;gena &oacute; a trav&eacute;s de la administraci&oacute;n ex&oacute;gena del factor neurotr&oacute;fico espec&iacute;fico para prevenir o detener la progresi&oacute;n de la enfermedad (Alberch <I>et al.</I>, 2002; Perez-Navarro <I>et al.</I>, 2000; Hersch y Rosas, 2008). En la EH, esta acci&oacute;n favorecedora ha sido aportada por BDNF (del ingl&eacute;s brain derived neurotrophic factor), donde se demuestra que esta prote&iacute;na contribuye de manera sustancial al soporte tr&oacute;fico y supervivencia de neuronas afectadas en esta enfermedad (Ma B <I>et al.</I>, 2010). </P >     <P   >Terapia g&eacute;nica. La EH es una de las 9 enfermedades neurodegenerativas dominantes que resulta de una expansi&oacute;n de poliglutamina repetida, que cobra una funci&oacute;n t&oacute;xica (The Huntington's disease colaborative group, 1993), por lo que en esta entidad la terapia g&eacute;nica cobra gran importancia. Hasta el presente se han descrito terapias en las que los animales han sido tratados con sustancias que incrementan trascripci&oacute;n de genes neuroprotectores (Ferrante <I>et al.</I>, 2003), prevenci&oacute;n de muerte por apoptosis e inhibici&oacute;n de la formaci&oacute;n de agregados de poliglutamina (Tanaka <I>et al.</I>, 2004; Karpuj <I>et al.</I>, 2002), entre otros. Todas estas terapias podr&iacute;an de manera indirecta afectar la expresi&oacute;n de alelos en la EH. Sin embargo, hasta la fecha no exist&iacute;an terapias, que describieran la reducci&oacute;n directa de la expresi&oacute;n del gen mutado que aparece en la enfermedad. Hoy d&iacute;a se conoce que la terapia que utiliza silenciamiento de la expresi&oacute;n de genes mutados pudiera ser promisoria en la EH, lo cual ya ha sido demostrado en modelos animales en los cuales se provoca silenciamiento de genes mutados que son responsables de las caracter&iacute;sticas neuropatol&oacute;gicas y motoras que se observan en la enfermedad, y que han dado el sustento para terapias que utilizan el ARN de interferencia (Yamamoto <I>et al.</I>, 2000; Harper <I>et al.</I>, 2005; Harper, 2009). </P >     <p    > CONCLUSI&Oacute;N  </p >     <P   > Hasta aqu&iacute; hemos hecho un recorrido por el estado del conocimiento acerca de la EH, espec&iacute;ficamente los referidos a las principales manifestaciones cl&iacute;nicas de la enfermedad y los s&iacute;ndromes cl&iacute;nicos que conforman. Se abordaron las estructuras del SNC que se encuentran afectadas, indicando las interrelaciones que existen entre ellas. Se exponen las bases neurales y moleculares que dan origen a esta afectaci&oacute;n. Se describen adem&aacute;s, los modelos experimentales m&aacute;s utilizados para simular la enfermedad y el ensayo de diferentes terapias sustitutivas y neuroprotectoras. A nuestro juicio esta es una enfermedad de evoluci&oacute;n lenta, que por tener car&aacute;cter hereditario, pudiera ser candidata a estudios encaminados a la b&uacute;squeda de marcadores tempranos, indicativos de la enfermedad en sujetos con antecedentes familiares. </P >     <P   >La utilidad de uno u otro modelo experimental, dependen de los objetivos que se persigan en la investigaci&oacute;n, si tenemos en cuenta que ninguno de los modelos reproduce todas las caracter&iacute;sticas morfol&oacute;gicas, cognitivas y conductuales que aparecen en la enfermedad. </P >     ]]></body>
<body><![CDATA[<P   >Con el avance de las nuevas tecnolog&iacute;as, se han implementado formas de tratamiento que adem&aacute;s de aliviar s&iacute;ntomas, contribuyen a sustituir c&eacute;lulas da&ntilde;adas y/o restaurar el da&ntilde;o, entre otras v&iacute;as por efecto tr&oacute;fico sobre el tejido lesionado. Nosotros consideramos que este es un camino prometedor pues de esta manera las personas con dicha afecci&oacute;n lograr&iacute;an alcanzar una mayor calidad de vida. </P >     <p    > AGRADECIMIENTOS  </p >     <P   > Los autores agradecen a todos los contribuidores de este trabajo. </P >     <p    > BIBLIOGRAF&Iacute;A  </p >     <!-- ref --><P   > ALBERCH J, PEREZ-NAVARRO E, CANALS JM. Neuroprotection by neurotrophins and GDNF family members in the excitotoxic model of Huntington's disease. 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