<?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>1989-3809</journal-id>
<journal-title><![CDATA[Escritos de Psicología (Internet)]]></journal-title>
<abbrev-journal-title><![CDATA[Escritos de Psicología]]></abbrev-journal-title>
<issn>1989-3809</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Psicología. Universidad de Málaga]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1989-38092011000300001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Función del ácido lisofosfatídico como regulador lipídico modulador del comportamiento]]></article-title>
<article-title xml:lang="en"><![CDATA[Role of lysophosphatidic acid as lipid mediator in behavior]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Estivill-Torrús]]></surname>
<given-names><![CDATA[Guillermo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santín]]></surname>
<given-names><![CDATA[Luis Javier]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pedraza]]></surname>
<given-names><![CDATA[Carmen]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castilla-Ortega]]></surname>
<given-names><![CDATA[Estela]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez de Fonseca]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Fundación Instituto Mediterráneo para el Avance de la Biotecnología y la Investigación Sanitaria (IMABIS) Unidad de Microscopía ]]></institution>
<addr-line><![CDATA[Málaga ]]></addr-line>
<country>España</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Málaga Facultad de Psicología Departamento de Psicobiología y Metodología de las Ciencias del Comportamiento]]></institution>
<addr-line><![CDATA[Málaga ]]></addr-line>
<country>España</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Fundación IMABIS Laboratorio de Medicina Regenerativa ]]></institution>
<addr-line><![CDATA[Málaga ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>4</volume>
<numero>3</numero>
<fpage>1</fpage>
<lpage>14</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_arttext&amp;pid=S1989-38092011000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_abstract&amp;pid=S1989-38092011000300001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.isciii.es/scielo.php?script=sci_pdf&amp;pid=S1989-38092011000300001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El ácido lisofosfatídico (LPA, del inglés lysophosphatidic acid) es un fosfolípido endógeno implicado en numerosos y diferentes procesos celulares a través de receptores acoplados a proteína G específicos (LPA1-6). El descubrimiento de una vía de señalización mediada por LPA en el cerebro en desarrollo y en el adulto permitió la caracterización posterior de sus funciones neurales. Los estudios realizados hasta la fecha por medio de aproximaciones experimentales tales como la deleción génica, que permitiera el desarrollo de animales nulos carentes de los receptores específicos, han representado una herramienta de indudable valía para demostrar la necesidad de, al menos, la expresión del receptor LPA1 para el desarrollo normal de la función cerebral y su función en numerosos procesos que incluyen la proliferación y diferenciación neural, supervivencia celular, sinapsis, neurotransmisión, o el balance neuroquímico, en diferentes áreas cerebrales y, de manera notable, en el hipocampo. Actualmente, son ya numerosos los trabajos que muestran alteraciones que afectarían a los procesos cognitivos y emocionales en correlación con las alteraciones estructurales y neuroquímicas descritas. En este artículo se revisan las funciones del LPA en el comportamiento particularizadas, principalmente, al receptor LPA1, y se mencionan, igualmente, sus implicaciones en patologías psiquiátricas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Lysophosphatidic acid (LPA) is an endogenous phospholipid which is involved in many different cellular processes through specific G-protein coupled receptors (LPA1-6). The finding of a lysophosphatidic acid (LPA) signaling pathway in the developing and adult brain led to the characterization of the functional roles of LPA in normal and diseased brain. Previous studies using pharmacological or genetic approaches such as receptor null mice have been demonstrated as indispensable to determine the requirement of, at least, LPA1 receptor for normal brain function and its influence in many different processes including neural cell proliferation and differentiation, cell survival, synapsis, neural transmission, or neurochemical balance in a variety of cerebral areas although, remarkably, the hippocampus. To date numerous contributions have showed behavioral alterations affecting cognition and emotional behavior in correlation with structural and neurochemical observations. Here we review the functions of LPA in behavior, principally particularized to those mediated by LPA1 receptor, and also discuss their relevance to psychiatric disorders.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Ácido lisofosfatídico]]></kwd>
<kwd lng="es"><![CDATA[Comportamiento]]></kwd>
<kwd lng="es"><![CDATA[Aprendizaje]]></kwd>
<kwd lng="es"><![CDATA[Memoria]]></kwd>
<kwd lng="es"><![CDATA[Esquizofrenia]]></kwd>
<kwd lng="en"><![CDATA[Lysophosphatidic Acid]]></kwd>
<kwd lng="en"><![CDATA[Behavior]]></kwd>
<kwd lng="en"><![CDATA[Learning and Memory]]></kwd>
<kwd lng="en"><![CDATA[Schizophrenia]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="4"><a name="top"></a><b>Funci&oacute;n del &aacute;cido lisofosfat&iacute;dico como regulador lip&iacute;dico modulador del comportamiento</b></font></p>     <p><font face="Verdana" size="4"><b>Role of lysophosphatidic acid as lipid mediator in behavior</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Guillermo Estivill-Torr&uacute;s<sup>1</sup>, Luis Javier Sant&iacute;n<sup>2</sup>, Carmen Pedraza<sup>2</sup>, Estela Castilla-Ortega<sup>2</sup>, Fernando Rodr&iacute;guez de Fonseca<sup>3</sup></b></font></p>     <p><font face="Verdana" size="2"><sup>1</sup>Unidad de Microscop&iacute;a, Fundaci&oacute;n IMABIS, M&aacute;laga, Espa&ntilde;a.    <br><sup>2</sup>Departamento de Psicobiolog&iacute;a y Metodolog&iacute;a de las Ciencias del Comportamiento, Facultad de Psicolog&iacute;a, Universidad de M&aacute;laga, Espa&ntilde;a.    <br><sup>3</sup>Laboratorio de Medicina Regenerativa, Fundaci&oacute;n IMABIS, M&aacute;laga, Espa&ntilde;a.</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Este trabajo se ha realizado bajo la  financiación del Programa I3SNS (GET), proyectos PI10/02514 (GET), SEJ-4515 (LJS), PSI2010-16160 (LJS), Red de Trastornos Adictivos RTA (RD06/001) (FRDF), CTS643 and CTS433 (Instituto de Salud Carlos III, Ministerios de Sanidad y de Ciencia e Innovación, Consejerías de Salud y de Innovación, Ciencia y Empresa, de la Junta de Andalucía), así como cofinanciado por el Fondo Europeo de Desarrollo Regional</font></p>     <p><font face="Verdana" size="2"><a href="#bajo">Dirección para correspondencia</a></font></p>     <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 &aacute;cido lisofosfat&iacute;dico (LPA, del ingl&eacute;s <i>lysophosphatidic acid</i>) es un fosfol&iacute;pido end&oacute;geno implicado en numerosos y diferentes procesos celulares a trav&eacute;s de receptores acoplados a prote&iacute;na G espec&iacute;ficos (LPA<sub>1-6</sub>). El descubrimiento de una v&iacute;a de se&ntilde;alizaci&oacute;n mediada por LPA en el cerebro en desarrollo y en el adulto permiti&oacute; la caracterizaci&oacute;n posterior de sus funciones neurales. Los estudios realizados hasta la fecha por medio de aproximaciones experimentales tales como la deleci&oacute;n g&eacute;nica, que permitiera el desarrollo de animales nulos carentes de los receptores espec&iacute;ficos, han representado una herramienta de indudable val&iacute;a para demostrar la necesidad de, al menos, la expresi&oacute;n del receptor LPA<sub>1</sub> para el desarrollo normal de la funci&oacute;n cerebral y su funci&oacute;n en numerosos procesos que incluyen la proliferaci&oacute;n y diferenciaci&oacute;n neural, supervivencia celular, sinapsis, neurotransmisi&oacute;n, o el balance neuroqu&iacute;mico, en diferentes &aacute;reas cerebrales y, de manera notable, en el hipocampo. Actualmente, son ya numerosos los trabajos que muestran alteraciones que afectar&iacute;an a los procesos cognitivos y emocionales en correlaci&oacute;n con las alteraciones estructurales y neuroqu&iacute;micas descritas. En este art&iacute;culo se revisan las funciones del LPA en el comportamiento particularizadas, principalmente, al receptor LPA<sub>1</sub>, y se mencionan, igualmente, sus implicaciones en patolog&iacute;as psiqui&aacute;tricas.</font></p>     <p><font face="Verdana" size="2"><b>Palabras clave:</b> &Aacute;cido lisofosfat&iacute;dico; Comportamiento; Aprendizaje; Memoria; Esquizofrenia.</font></p> <hr size="1">     <p><font face="Verdana" size="2"><b>ABSTRACT</b></font></p>     <p><font face="Verdana" size="2">Lysophosphatidic acid (LPA) is an endogenous phospholipid which is involved in many different cellular processes through specific G-protein coupled receptors (LPA<sub>1-6</sub>). The finding of a lysophosphatidic acid (LPA) signaling pathway in the developing and adult brain led to the characterization of the functional roles of LPA in normal and diseased brain. Previous studies using pharmacological or genetic approaches such as receptor null mice have been demonstrated as indispensable to determine the requirement of, at least, LPA<sub>1</sub> receptor for normal brain function and its influence in many different processes including neural cell proliferation and differentiation, cell survival, synapsis, neural transmission, or neurochemical balance in a variety of cerebral areas although, remarkably, the hippocampus. To date numerous contributions have showed behavioral alterations affecting cognition and emotional behavior in correlation with structural and neurochemical observations. Here we review the functions of LPA in behavior, principally particularized to those mediated by LPA<sub>1</sub> receptor, and also discuss their relevance to psychiatric disorders.</font></p>     <p><font face="Verdana" size="2"><b>Key words:</b> Lysophosphatidic Acid; Behavior; Learning and Memory; Schizophrenia.</font></p> <hr size="1">     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font face="Verdana" size="2">Los procesos que regulan el desarrollo del sistema nervioso central (SNC) precisan de una cuidadosa y bien orquestada secuencia de eventos que resulta imprescindible para la correcta funcionalidad cerebral. Las c&eacute;lulas progenitoras neurales, desde la zona ventricular, se expanden por medio de oleadas de progenitores que generar&aacute;n los diferentes tipos celulares, neuronas, astrocitos y oligodendrocitos, y cuya migraci&oacute;n act&uacute;a, a su vez, en coordinaci&oacute;n con los procesos proliferativos as&iacute; como de muerte celular programada, a objeto de realizar de manera equilibrada la g&eacute;nesis neural. Todos estos procesos se encuentran bajo la influencia de diferentes factores intr&iacute;nsecos y se&ntilde;ales extracelulares como, por ejemplo, los factores de crecimiento, que afectan a la morfolog&iacute;a, divisi&oacute;n, destino o supervivencia celulares. De entre estos factores, los lisofosfol&iacute;pidos y, especialmente, el &aacute;cido lisofosfat&iacute;dico, han demostrado ser una influencia muy importante para el desarrollo del sistema nervioso.</font></p>     <p><font face="Verdana" size="2">El &aacute;cido lisofosfat&iacute;dico (LPA, del ingl&eacute;s <i>lysophosphatidic acid</i>) es un fosfol&iacute;pido simple end&oacute;geno bioactivo, constituyente relevante del suero, y liberado, bajo diferentes condiciones, en c&eacute;lulas y fluidos biol&oacute;gicos (Aoki, Inoue y Okudaira, 2008; Aoki et al., 2004; Van Meeteren y Moolenaar 2007). El LPA tiene importantes funciones biol&oacute;gicas actuando, como mediador intercelular y a trav&eacute;s de, al menos, seis receptores espec&iacute;ficos acoplados a prote&iacute;na G de amplia distribuci&oacute;n (LPA<sub>1-6</sub>) en numerosos procesos celulares que incluyen proliferaci&oacute;n, diferenciaci&oacute;n, supervivencia y migraci&oacute;n celular (Anliker y Chun, 2004; Birgbauer y Chun, 2006; Choi et al., 2010; Chun, 2007; Chun et al., 2010; Ishii, Fukushima, Ye y Chun, 2004; Moolenar, van Meeteren y Giepmans, 2004; Noguchi, Herr, Mutoh y Chun, 2009; Rivera y Chun, 2008). La demostraci&oacute;n de una v&iacute;a de se&ntilde;alizaci&oacute;n mediada por LPA en el sistema nervioso central sent&oacute; las bases para la posterior caracterizaci&oacute;n de las funciones del LPA en el cerebro hasta constituirse, a d&iacute;a de hoy, como una importante mol&eacute;cula reguladora en el cerebro normal as&iacute; como bajo condiciones patol&oacute;gicas (Choi et al., 2010; Chun, 2005; Goldshmit, Munro, Yuen Leong, P&eacute;bay y Turnley, 2010; Lin, Herr y Chun, 2010; Noguchi et al., 2009). Un gran n&uacute;mero de estudios han demostrado su participaci&oacute;n, principalmente a trav&eacute;s del receptor LPA<sub>1</sub>, en progenitores neurales o c&eacute;lulas troncales, neuronas, astrocitos, o en oligodendrocitos (Choi et al., 2008, 2010; Chun et al., 2000; Chun, 2005; Fukushima, Ye y Chun, 2004; Noguchi et al., 2009). Los diferentes efectos morfol&oacute;gicos y funcionales dependientes de la se&ntilde;alizaci&oacute;n mediada a trav&eacute;s del receptor LPA<sub>1</sub>, as&iacute; como la expresi&oacute;n espec&iacute;fica de dicho receptor en las regiones neurog&eacute;nicas, tanto durante el desarrollo, en la zona ventricular embrionaria, donde fue identificado inicialmente (Hecht et al., 1996), como en el cerebro adulto, en la zona subventricular de los ventr&iacute;culos laterales (observaci&oacute;n no publicada) y en el giro dentado del hipocampo (Matas-Rico et al., 2008) le confieren una participaci&oacute;n &uacute;nica en los mecanismos de neurog&eacute;nesis y plasticidad adultos. Sin embargo, hasta ahora, no se han realizado a&uacute;n estudios en profundidad que permitan conocer adecuadamente su papel en el comportamiento. Esta revisi&oacute;n se centra precisamente en el papel espec&iacute;fico del LPA en relaci&oacute;n con el comportamiento y sus implicaciones patol&oacute;gicas potenciales en psiquiatr&iacute;a.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Influencia de los receptores de LPA sobre la neuroqu&iacute;mica y fisiolog&iacute;a sin&aacute;ptica, base neurobiol&oacute;gica del comportamiento.</b></font></p>     <p><font face="Verdana" size="2">El estudio de ratones modificados gen&eacute;ticamente por deleci&oacute;n, nulos para los receptores de LPA, ha permitido avanzar considerablemente en el estudio de sus funciones en el SNC. El primer rat&oacute;n nulo para LPA<sub>1</sub> se desarroll&oacute; con la deleci&oacute;n del ex&oacute;n 3 del gen <i>Lpar1</i>, que conten&iacute;a los dominios que codifican para el sitio de uni&oacute;n del ligando (Contos, Fukushima, Weiner, Kaushal y Chun, 2000) y se caracterizaba por presentar una mortalidad perinatal muy acusada. Los supervivientes mostraban reducci&oacute;n de peso corporal y dimorfismo craneofacial, hocicos cortos, ojos espaciados, menor masa cerebral y, de manera llamativa, d&eacute;ficit en el comportamiento de succi&oacute;n de la mama, debido, probablemente, a una olfacci&oacute;n deficitaria (Contos et al., 2000). Poco tiempo despu&eacute;s se publicar&iacute;an resultados de otro rat&oacute;n nulo para el receptor LPA<sub>1</sub>, independiente del primero, por parte de Harrison et al. (2003) y que compart&iacute;a con aqu&eacute;l los defectos observados, no mostrando ambos ratones ninguna anomal&iacute;a estructural significativa. Sin embargo, el estudio de Harrison et al. (2003) fue m&aacute;s all&aacute; y describi&oacute; por vez primera alteraciones fenot&iacute;picas en relaci&oacute;n al comportamiento. As&iacute;, el examen de la regulaci&oacute;n sensoriomotora, por medio del an&aacute;lisis de la inhibici&oacute;n prepulso (PPI, del ingl&eacute;s <i>prepulse inhibition</i>) de la respuesta a sobresaltos, demostr&oacute; que los ratones carentes del receptor LPA<sub>1</sub> presentaban una menor reducción de la actividad locomotora y un importante déficit en el circuito de reflejo al estímulo, lo que sugería importantes implicaciones para patologías de índole psiquiátrica, como se discutirá detalladamente más adelante.</font></p>     <p><font face="Verdana" size="2">El grupo de Harrison et al. (2003) valor&oacute;, adem&aacute;s, la concentraci&oacute;n de 5-hidroxitriptamina (5-HT; serotonina), dopamina, as&iacute; como los metabolitos intermedios de ambos y la composici&oacute;n aminoac&iacute;dica, encontrando en los animales carentes del receptor LPA<sub>1</sub> un importante d&eacute;ficit en la producci&oacute;n de serotonina en numerosas &aacute;reas cerebrales que inclu&iacute;an la corteza frontal, el hipocampo, el hipot&aacute;lamo y el n&uacute;cleo accumbens, entre otras y, por contra, un incremento de la misma en el estriado. Los niveles de amino&aacute;cidos tambi&eacute;n se vieron reducidos en dichas &aacute;reas siendo los cambios mayores en el hipocampo. En posteriores estudios del mismo grupo (Roberts et al., 2005) se detectaron diferencias m&aacute;s espec&iacute;ficas que permitieron mostrar un d&eacute;ficit en la liberaci&oacute;n inducida de GABA y glutamato y, por ende, una menor disponibilidad de dichos neurotransmisores, en el hipocampo de los animales nulos para el receptor LPA<sub>1</sub>. De manera similar, el patr&oacute;n resultaba igualmente deficitario para la serotonina en el n&uacute;cleo dorsal del rafe, lo cual correlacionaba con las anteriores observaciones de Harrison et al. (2003) mostrando una disminuci&oacute;n de producci&oacute;n de serotonina en corteza cerebral e hipocampo, &aacute;reas terminales de proyecci&oacute;n desde dicho n&uacute;cleo. Adem&aacute;s de la importancia para los estudios de inhibici&oacute;n prepulso, todos estos cambios deber&iacute;an tener un considerable impacto en estudios comportamentales. Tanto la dopamina como la serotonina est&aacute;n implicadas en el comportamiento de adaptaci&oacute;n, toma de decisiones y aprendizaje por refuerzo (Cools, Nakamura y Daw, 2011). Por otra parte, se ha demostrado que la alteraci&oacute;n de sistemas serotonin&eacute;rgicos es capaz de producir efectos comportamentales tales como cambios en la regulaci&oacute;n de temperatura, ritmos de vigilia-sue&ntilde;o, em&eacute;sis, comportamiento sexual, agresividad, nocicepci&oacute;n, balance energ&eacute;tico o incluso en el estado de humor (Berger, Gray y Roth, 2009; Jonnakuty y Gragnoli, 2008; Lam et al., 1997; Tecott, 2007; Weiger, 1997). Adem&aacute;s, el hipocampo recibe una fuerte inervaci&oacute;n serotonin&eacute;rgica desde el n&uacute;cleo del rafe, actuando como un importante regulador entre las respuestas del sistema serotonin&eacute;rgico y neuroendocrina al estr&eacute;s, y reduciendo as&iacute;, por ejemplo, los efectos ansiog&eacute;nicos de los est&iacute;mulos estresores (Joca, Ferreira y Guimaraes, 2007). Sin embargo, a pesar de todos los cambios neuroqu&iacute;micos observados en estos animales y sus evidentes implicaciones potenciales en comportamiento, no se pudo demostrar ninguna anomal&iacute;a en la funcionalidad hipocampal en t&eacute;rminos electrofisiol&oacute;gicos o sin&aacute;pticos.</font></p>     <p><font face="Verdana" size="2">En este sentido, hace ya unos a&ntilde;os, se demostraba que el LPA era capaz de influir la liberaci&oacute;n de transmisores en la sinapsis en condiciones ex vivo inhibiendo la actividad de la ATPasa para sodio y potasio en la membrana celular de sinaptosomas de corteza cerebral (Nishikawa, Tomori, Yamashita y Shimizu, 1989). Otros estudios demostrar&iacute;an, posteriormente, el papel del LPA como activador de la GTPasa Rho en la plasticidad y organizaci&oacute;n estructural sin&aacute;ptica (Fukushima, Ishii, Habara, Allen y Chun, 2002; Tigyi et al., 1996; Zhang, Schaefer, Burnette, Schoonderwoert y Forscher, 2003) y en neuronas hipocampales (Fujiwara et al., 2003; Jin Rhee et al., 2006; Pilpel y Segal, 2006; Pyka et al., 2011; Tabuchi et al., 2000) donde tambi&eacute;n participar&iacute;a en la reorganizaci&oacute;n de dendritas y axones del hipocampo (Benarroch, 2007). Adem&aacute;s, se ha demostrado que el incremento de la actividad de Rho mediado por LPA permite mejorar la memoria espacial a largo plazo (Dash, Orsi,Moody y Moore, 2004). Usando como prueba el laberinto acu&aacute;tico de Morris, Dash et al. (2004) observaron que la administraci&oacute;n intrahipocampal de LPA tras el entrenamiento de la tarea lograba que el animal precisara de mucho menos tiempo para localizar la plataforma, y suger&iacute;an un nexo funcional entre Rho y el LPA de la misma manera que se ha descrito para otras v&iacute;as de se&ntilde;alizaci&oacute;n implicadas en la formaci&oacute;n de memoria, tales como la v&iacute;a de la prote&iacute;na cinasa C, la mediada por fosfoinositol 3-cinasa, o la v&iacute;a de la cinasa regulada por se&ntilde;ales extracelulares. De hecho, se ha demostrado que los receptores de LPA activan la v&iacute;a de la prote&iacute;na cinasa C, aumentando la fosforilaci&oacute;n de una isoforma de cinasa de adhesi&oacute;n focal (Derkinderen, Siciliano, Toutant y Girault, 1998) y la actividad de los receptores de NMDA en las sinapsis de las neuronas piramidales del hipocampo (Lu et al., 1999), lo que sugiere una funci&oacute;n del LPA en la plasticidad sin&aacute;ptica. Los estudios en estos &uacute;ltimos a&ntilde;os han puesto de manifiesto un papel del LPA en las sinapsis y la electrofisiolog&iacute;a del hipocampo. Cunningham et al. (2006) han mostrado que la ausencia del receptor LPA<sub>1</sub> causa una reducci&oacute;n de las oscilaciones de frecuencia alta, o gamma, en las capas superficiales de la corteza entorrinal, a nivel del hipocampo, as&iacute; como del n&uacute;mero de neuronas GABA&eacute;rgicas. Por otro lado, Musazzi, Daniel, Maycox, Racagni y Popoli (2010), usando sinaptosomas del hipocampo de ratones carentes del receptor LPA<sub>1</sub>, encontraron una desregulaci&oacute;n de las subunidades alfa y beta de la enzima CaMKII a nivel sin&aacute;ptico, donde la enzima, que act&uacute;a como un regulador clave en la potenciaci&oacute;n a largo plazo y la excitabilidad neuronal (Lisma, Schulman y Cline, 2002), modular&iacute;a la transmisi&oacute;n glutamat&eacute;rgica. A nivel postsin&aacute;ptico los animales nulos para LPA<sub>1</sub> mostraban cambios en la interacci&oacute;n de la enzima con los receptores glutamat&eacute;rgicos ionotr&oacute;picos NMDA y AMPA, conductancia alterada en los receptores AMPA y reducci&oacute;n de respuesta en v&iacute;as de se&ntilde;alizaci&oacute;n intracelular por NMDA lo que, en conjunto, generaba una mayor reactividad sin&aacute;ptica, combinada con una menor sensibilidad de respuesta al est&iacute;mulo mediado por v&iacute;a glutamat&eacute;rgica, y pon&iacute;a de manifiesto la disfunci&oacute;n del hipocampo en ausencia del receptor LPA<sub>1</sub>. Adem&aacute;s, a nivel presin&aacute;ptico estos animales mostraban una acumulaci&oacute;n de los denominados complejos de prote&iacute;nas SNARE, mediadores de la fusi&oacute;n de ves&iacute;culas sin&aacute;pticas y que tienen relevancia en algunas patolog&iacute;as como la esquizofrenia.</font></p>     <p><font face="Verdana" size="2">Por otra parte, no la ausencia, sino la sobreexpresi&oacute;n del receptor LPA<sub>1</sub> tambi&eacute;n provoca anomal&iacute;as sin&aacute;pticas, observ&aacute;ndose cambios morfol&oacute;gicos en las espinas dendr&iacute;ticas de neuronas hipocampales que alteran las propiedades electrofisiol&oacute;gicas del espacio postsin&aacute;ptico, tanto en la cin&eacute;tica de la corriente sin&aacute;ptica como a nivel de composici&oacute;n del canal sin&aacute;ptico (Pilpel y Segal, 2006). Estos cambios estructurales est&aacute;n en consonancia con los estudios que describen en experimentos de cocultivos de neuronas y astrocitos hipocampales c&oacute;mo la arquitectura de la espina dendr&iacute;tica puede ser modulada por adici&oacute;n de LPA, facilitando la sinaptog&eacute;nesis (Pyka et al., 2011). Adem&aacute;s, hay que considerar, igualmente, que esos astrocitos, que tambi&eacute;n expresan receptores de LPA, pueden inducir, o controlar, cambios en la intensidad sin&aacute;ptica a trav&eacute;s de la liberaci&oacute;n de diferentes gliotransmisores los cuales, a su vez, regulan la densidad postsin&aacute;ptica de receptores AMPA (Bains y Oliet, 2007).</font></p>     <p><font face="Verdana" size="2">La se&ntilde;alizaci&oacute;n mediada por LPA en la sinapsis hipocampal implica no solo al receptor LPA<sub>1</sub> sino tambi&eacute;n, por ejemplo, al receptor LPA<sub>2</sub>, que se ha detectado en terminales presin&aacute;pticos glutamat&eacute;rgicos. Muchos de los procesos que participan en la memoria o en la consolidaci&oacute;n de la potenciaci&oacute;n a largo plazo son activados y regulados por modificaciones en el estado de fosforilaci&oacute;n de diferentes prote&iacute;nas cinasas como Erk y CaMKII cuya actividad puede ser tambi&eacute;n modulada por neurotransmisores como la 5-HT (Cammarota, Bevilaqua, Medina e Izquierdo, 2008). De esta forma, la secuencia orquestada de eventos, as&iacute; como las consecuencias resultantes en t&eacute;rminos de plasticidad neuronal y/o formaci&oacute;n de memoria, confieren al LPA un importante papel para ser considerado en cualquier an&aacute;lisis o estudio comportamental.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Papel del receptor LPA<sub>1</sub> en el aprendizaje y la memoria</b></font></p>     <p><font face="Verdana" size="2">Hasta estos &uacute;ltimos a&ntilde;os y, a excepci&oacute;n de los estudios citados de Dash et al. (2004) y Harrison et al. (2003), no se hab&iacute;an realizado otros en relaci&oacute;n a comportamiento o que incluyeran tareas de aprendizaje y memoria. Fue, precisamente, hace poco, cuando un exhaustivo an&aacute;lisis realizado por nuestro grupo (Sant&iacute;n et al., 2009) demostraba la implicaci&oacute;n de este receptor en conducta usando una bater&iacute;a de pruebas neurol&oacute;gicas y examinando la habituaci&oacute;n, el comportamiento exploratorio en respuesta a ambientes inductores de baja y moderada ansiedad, y la memoria espacial. Este estudio se llev&oacute; a cabo sobre ratones nulos para LPA<sub>1</sub> de la variedad <i>M&aacute;laga</i>, denominados como maLPA<sub>1</sub>-<i>null</i> (Estivill-Torr&uacute;s et al., 2008), variante espont&aacute;nea de la cepa original de Contos et al. (2000). Los ratones maLPA<sub>1</sub>-<i>null</i> muestran un fenotipo m&aacute;s severo que el original, con una zona ventricular embrionaria reducida en la que la neurog&eacute;nesis est&aacute; alterada y que termina por generar una mayor apoptosis cortical y una pared cortical menor (Estivill-Torr&uacute;s et al., 2008). Estos ratones presentan tambi&eacute;n defectos en la neurog&eacute;nesis adulta hipocampal que tiene lugar en el giro dentado, tanto en condiciones basales como tras estimulaci&oacute;n por combinaci&oacute;n de exposici&oacute;n a enriquecimiento ambiental y ejercicio voluntario, afect&aacute;ndose no solo la propia neurog&eacute;nesis, sino tambi&eacute;n la supervivencia y maduraci&oacute;n neuronal temprana, particularmente la disposici&oacute;n y ramificaci&oacute;n dendr&iacute;tica, y demostrando influencias espec&iacute;ficas del contexto experimental en el adulto sobre los niveles de factores neurotr&oacute;ficos (Matas-Rico et al., 2008). Considerando que las nuevas neuronas que se acaban de formar pueden recibir sinapsis funcionales cuando aun son j&oacute;venes y participar en la formaci&oacute;n de nueva memoria (Aimone, Deng y Gage, 2011; Castilla-Ortega, Pedraza, Estivill-Torr&uacute;s y Sant&iacute;n, 2011; Deng, Aimone y Gage, 2010; Goodman et al., 2010; Macklis, 2001; Shors, 2004; Shors et al., 2001; Van Praag et al., 2002) se puede percibir f&aacute;cilmente la relevancia de estas deficiencias en el comportamiento, principalmente en memoria.</font></p>     <p><font face="Verdana" size="2">As&iacute;, Sant&iacute;n et al. (2009), en el citado estudio, analiz&oacute; el papel del receptor LPA<sub>1</sub> en funciones sensoriomotoras, emocionales y cognitivas, encontrando, inicialmente y tras usar una amplia bater&iacute;a de pruebas sensoriales estandarizadas (Bj&ouml;rklund, Dunnet, Stenevi, Lewuis e Iversen, 1980; Bures, Buresovay Huston, 1983; Marshall y Titelbaum, 1974), que los animales carentes del receptor presentaban d&eacute;ficits neurol&oacute;gicos no severos que afectaban la olfacci&oacute;n, somestesia, reflejos de extremidades, coordinaci&oacute;n y fuerza neuromuscular. En segundo lugar, la ejecuci&oacute;n de las pruebas revel&oacute; de manera significativa, y en ausencia del receptor LPA<sub>1</sub>, un d&eacute;ficit exploratorio en la prueba de campo abierto y un aumento del comportamiento de tipo ansioso en la prueba del laberinto en cruz elevado. Concretamente, los animales nulos para el receptor realizaban trayectos de menor distancia en la prueba de campo abierto, sin variar la actividad en una segunda exposici&oacute;n al test, es decir, en condiciones de familiaridad vs. novedad. Adem&aacute;s, en el laberinto en cruz elevado ejecutaban menos transiciones que los animales control y mostraban, respecto a estos, una notable reducci&oacute;n del &iacute;ndice de ansiedad, medido como el tiempo de permanencia en los brazos abiertos dividido por el tiempo de permanencia tanto en brazos abiertos como cerrados, donde los valores bajos indican niveles elevados de comportamiento de tipo ansioso (Malleret, Hen, Guillou, Segu y Buhot, 1999). Por otra parte, estas respuestas comportamentales pueden ser moduladas directamente o bien por otros factores cuya liberaci&oacute;n tambi&eacute;n est&aacute; afectada por la ausencia del receptor LPA<sub>1</sub>, como la serotonina (Harrison et al., 2003). En favor de esta hip&oacute;tesis habr&iacute;a que considerar la fuerte proyecci&oacute;n serotonin&eacute;rgica que recibe el hipocampo y que le permite activar receptores como el de serotonina de tipo 1A (Chalmers y Watson, 1991; Jacobs y Azmitia, 1992), presente en una alta concentraci&oacute;n en el hipocampo de roedores, e implicado en respuestas emocionales como la ansiedad, el estr&eacute;s, o la depresi&oacute;n (Joca et al., 2007; L&oacute;pez, Liberzon, V&aacute;zquez, Young y Watson, 1999; Mueller y Beck, 2000; Parks, Robinson, Sibille, Shenk y Toth, 1998; Savitz, Lucki y Drevets, 2009). Las deficiencias comportamentales descritas por Sant&iacute;n et al. se correlacionan, adem&aacute;s, con las descritas anteriormente por Harrison et al. (2003), m&aacute;s a&uacute;n considerando el hecho de que las alteraciones del sistema serotonin&eacute;rgico son capaces de influir, entre otras pruebas, la ejecuci&oacute;n en el laberinto en cruz elevado (Belzung y Griebel, 2001), y apoyan, en definitiva, una regulaci&oacute;n dependiente de LPA de los procesos emocionales y moduladores de ansiedad.</font></p>     <p><font face="Verdana" size="2">Junto a esta implicaci&oacute;n en las respuestas emocionales, el estudio de Sant&iacute;n et al. (2009) demostr&oacute; c&oacute;mo los ratones <i>M&aacute;laga</i> nulos para LPA<sub>1</sub>, acompa&ntilde;aban estos defectos con otros, igualmente importantes, en memoria espacial. Previamente, Dash et al. (2004) hab&iacute;a demostrado, como se ha mencionado, que la administraci&oacute;n de LPA en ratas <i>Long-Evans</i> mejoraba la memoria espacial cuando se somet&iacute;an los animales a las pruebas en el laberinto acu&aacute;tico de Morris. Empleando en los ratones el mismo tipo de laberinto el trabajo de Sant&iacute;n et al. (2009) muestra que la ausencia del receptor LPA<sub>1</sub> no causa un d&eacute;ficit colectivo de aprendizaje espacial, ya que los animales eran capaces de aprender la localizaci&oacute;n de la plataforma en el agua, pero s&iacute; que &eacute;stos eran, de manera llamativa, m&aacute;s lentos que los controles, mostrando una retenci&oacute;n deficitaria de la memoria espacial y un uso an&oacute;malo de las estrategias de b&uacute;squeda, con predominio mayoritario de estrategias no espaciales sistem&aacute;ticas y trayectos con bucles repetitivos. Conjuntamente, todos estos resultados ponen de manifiesto que la ausencia del receptor LPA<sub>1</sub> desencadena un comportamiento de tipo ansioso y d&eacute;ficits de memoria espacial. No obstante, es dif&iacute;cil excluir si la ansiedad puede interferir el aprendizaje espacial, especialmente en el laberinto acu&aacute;tico de Morris, donde as&iacute; se ha descrito, siendo el aumento de la tigmotaxis indicativo de tal interferencia (Champagne, Dupuy, Rochford y Poirier, 2002; Whishaw, 1995). Es m&aacute;s, la ejecuci&oacute;n de algunas tareas, dependiendo de la cepa de rat&oacute;n estudiada, puede reflejar un comportamiento m&aacute;s relacionado con ansiedad que con la tarea cognitiva (Dockstader y van der Kooy, 2001; Ohl, Roedel, Storch, Holsboer y Landgraf, 2002), como ocurre, igualmente, cuando se desarrollan patrones an&oacute;malos de exploraci&oacute;n durante el test (Kameda et al., 2007; Ramos y Mormede, 1998).</font></p>     <p><font face="Verdana" size="2">Recientemente, nuestro grupo, haciendo uso del an&aacute;lisis de componentes principales, para as&iacute; estudiar m&uacute;ltiples variantes, ha podido analizar la ansiedad y la memoria espacial en los ratones carentes del receptor LPA<sub>1</sub>, as&iacute; como la interrelaci&oacute;n entre ambos, para discriminar y excluir la posible influencia de la actividad motora o el comportamiento de tipo ansioso en el aprendizaje. El estudio, llevado a cabo por Castilla-Ortega et al. (2010), empleaba el laberinto de hoyos, habida cuenta de su uso como test de ejecuci&oacute;n de tareas de aprendizaje espacial dependientes de hipocampo y donde, de manera similar al laberinto acu&aacute;tico de Morris, se precisan de pistas externas al propio laberinto para resolver la tarea (Oades, 1981). Dicho estudio analiz&oacute; en cada genotipo y tanto en contexto nuevo, como tras habituaci&oacute;n, las interacciones entre las diferentes respuestas est&aacute;ndar de conducta, es decir, la locomoci&oacute;n, la tigmotaxis o permanencia en periferia, la exploraci&oacute;n vertical mantenida por las patas traseras (<i>rearing</i>), la introducci&oacute;n exploratoria del hocico en el hoyo (<i>head dipping</i>), la valoraci&oacute;n de riesgo, el acicalamiento, y la defecaci&oacute;n, as&iacute; como la memoria de trabajo y de referencia, y la latencia, referida a la localizaci&oacute;n, por parte del animal, del reforzador en los hoyos. Los ratones maLPA<sub>1</sub>-null mostraron una reducci&oacute;n del comportamiento exploratorio ante un contexto novedoso, de acuerdo a lo previamente observado (Sant&iacute;n et al., 2009) y, adem&aacute;s, no redujeron la tigmotaxis en un contexto familiar, ni durante el aprendizaje espacial, mostrando un d&eacute;ficit de habituaci&oacute;n en todas las variables estudiadas. El estudio por componentes determinar&iacute;a, posteriormente, la independencia entre la conducta de exploraci&oacute;n y el comportamiento de tipo ansioso. Por otro lado, en ausencia del receptor, y durante el &uacute;ltimo d&iacute;a de aprendizaje, ten&iacute;a lugar un d&eacute;ficit importante en la memoria de referencia. Adem&aacute;s, estos animales mostraban un d&eacute;ficit conforme aumentaba la dificultad de la tarea, principalmente en los intervalos largos entre las pruebas, lo que suger&iacute;a la implicaci&oacute;n del receptor LPA<sub>1</sub> en tareas de retenci&oacute;n de memoria a largo plazo, espec&iacute;ficamente atribuidas a la funci&oacute;n del hipocampo (Yoon, Okada, Jung y Kim, 2008). De manera similar, la memoria espacial tambi&eacute;n se vio afectada tras la deleci&oacute;n del receptor, produci&eacute;ndose un d&eacute;ficit en la adquisici&oacute;n de reglas procedimentales de memoria de trabajo al inicio y, especialmente, al aumentar el nivel de dificultad de la tarea y el tiempo entre las pruebas, lo que reflejaba un defecto en el aprendizaje gradual de los procedimientos para la correcta ejecuci&oacute;n. El estudio de componentes realizado por Castilla-Ortega et al. (2010) en este estudio demostrar&iacute;a, de nuevo, que las conductas que demostraban d&eacute;ficits en las memorias de trabajo y de referencia, eran independientes de los patrones observados de exploraci&oacute;n y ansiedad, demostrando la implicaci&oacute;n espec&iacute;fica del receptor LPA<sub>1</sub> en el aprendizaje y en la conducta emocional. Estos resultados se correlacionan, adem&aacute;s, con los mostrados por Matas-Rico et al. (2008) ya que tanto la neurog&eacute;nesis adulta como los factores neurotr&oacute;ficos relacionados, alterados en ausencia del receptor, se han relacionado frecuentemente con las memorias de trabajo y de referencia (Aimone et al., 2011; Castilla-Ortega et al., 2011; Deng et al., 2010; Goodman et al., 2010; Leuner, Gould y Shors, 2006; Macklis, 2001; Mizuno, Yamada, He, Nakajima y Nabeshima, 2003; Saxe et a., 2007; Shors, 2004; Shors et al., 2001; Tyler, Alonso, Bramham y Pozzo-Miller, 2002; Van Praag et al., 2002.</font></p>     <p><font face="Verdana" size="2"><b>Implicaci&oacute;n del receptor LPA<sub>1</sub> en patologías psiquiátricas</b></font></p>     <p><font face="Verdana" size="2">La mayor parte de la investigaci&oacute;n en lisofosfol&iacute;pidos llevada a cabo estos &uacute;ltimos a&ntilde;os ha puesto de manifiesto el papel del LPA a trav&eacute;s de sus receptores, principalmente el LPA<sub>1</sub>, en numerosos procesos cerebrales, tanto durante el desarrollo como en la etapa adulta. La v&iacute;a de se&ntilde;alizaci&oacute;n por LPA<sub>1</sub>, participante necesaria en el desarrollo cerebral, en la modulaci&oacute;n de conductas de tipo ansioso, o en tareas cognitivas dependientes de hipocampo, se muestra as&iacute; como una v&iacute;a con un enorme potencial de implicaci&oacute;n en patolog&iacute;as de &iacute;ndole neuropsiqui&aacute;trico o cognitivo, particularmente en aquellas que, por ejemplo, se encuentran asociadas a un neurodesarrollo an&oacute;malo, como la esquizofrenia o el autismo, o aquellas otras, desencadenadas por factores ambientales, como el estr&eacute;s, que son mediadas tambi&eacute;n por la interacci&oacute;n con factores de predisposici&oacute;n o gen&eacute;ticos, afectando a la conducta cognitiva.</font></p>     <p><font face="Verdana" size="2">Las enfermedades asociadas a trastornos del neurodesarrollo, como la esquizofrenia o el autismo, son enfermedades complejas donde la patolog&iacute;a es el resultado final de una interacci&oacute;n prolongada entre factores ambientales y factores gen&eacute;ticos. No ha sido hasta estos &uacute;ltimos a&ntilde;os cuando la esquizofrenia ha empezado a ser considerada un trastorno del neurodesarrollo. Su etiolog&iacute;a a&uacute;n est&aacute; por averiguar en profundidad, pese a los estudios que inciden en su heredabilidad y en su origen gen&eacute;tico (Allan, Cardno y McGuffin, 2008; Cardno y Gottestman, 2000), siendo decisivos los mecanismos durante el desarrollo (Norton, Williams y Owen, 2006; Ross et al., 2010; Weinberger, 1987). Adem&aacute;s, los d&eacute;ficits cognitivos asociados a la esquizofrenia (d&eacute;ficit en memoria de procedimiento, d&eacute;ficit de atenci&oacute;n, habla incoherente, perseveraci&oacute;n) son estables durante el curso de la enfermedad y se desarrollan mucho antes de que aparezcan los s&iacute;ntomas positivos (alucinaciones, paranoia, delirios) o negativos (p&eacute;rdida o alteraciones del afecto, la voluntad, o el deseo del placer) de la misma (Tamminga y Holcomb, 2005). La hip&oacute;tesis del desarrollo para la esquizofrenia asume que, durante la gestaci&oacute;n, hay factores patog&eacute;nicos previos al comienzo de la enfermedad y que alteran el desarrollo normal neural, generando alteraciones de circuitos neuronales espec&iacute;ficos y confiriendo la vulnerabilidad necesaria para desencadenar la patolog&iacute;a. Esta hip&oacute;tesis se basa tanto en las observaciones que describen alteraciones estructurales a modo de las que afectan a la circuiter&iacute;a (Fallon, Opole y Potkin, 2003), volumen cortical (Wright et al., 2000) o anomal&iacute;as oligodendrocitarias y de sustancia blanca (Tkachev et al., 2003; Whitford et al., 2010), como en las asociaciones que muestran genes y factores, generalmente necesarios para la neurog&eacute;nesis y la plasticidad, que confieren susceptibilidad a la patolog&iacute;a (Gogos y Gerber, 2006).</font></p>     <p><font face="Verdana" size="2">En este sentido, y durante los &uacute;ltimos a&ntilde;os, se ha sugerido la v&iacute;a de se&ntilde;alizaci&oacute;n mediada por el receptor LPA<sub>1</sub> como una nueva v&iacute;a que puede estar implicada en la esquizofrenia, a la vista de estar involucrada en dos de los procesos afectados en la patolog&iacute;a, el desarrollo del sistema nervioso central y la mielinizaci&oacute;n, en fase postnatal (Desbonnet, Waddington y Tuathaigh, 2009). As&iacute;, el rat&oacute;n carente del receptor LPA<sub>1</sub> ha ganado inter&eacute;s como modelo de esta patolog&iacute;a (Bowden et al., 2006; Desbonnet et al., 2009; Harrison et al., 2003; Murph, Nguyen, Radhakrishna y Mills, 2008; Roberts et al., 2005; Van den Buuse, 2010), especialmente una vez que se ha mostrado que el gen que codifica al receptor en el hombre, <i>LPAR1</i>, se encuentra en un peque&ntilde;o grupo de genes con una estrecha asociaci&oacute;n con la patolog&iacute;a, estando regulado a la baja en los pacientes (Bowden et al., 2006). El rat&oacute;n nulo para el receptor LPA<sub>1</sub> comparte rasgos comunes con la enfermedad. As&iacute;, la deleci&oacute;n en homocigosis del receptor en diferentes cepas causa dimorfismo craneofacial (Contos et al., 2000; Estivill-Torr&uacute;s et al., 2008; Harrison et al., 2003), reducci&oacute;n de volumen cortical y alteraci&oacute;n del desarrollo cortical (Estivill-Torr&uacute;s et al., 2008), defecto de la neurog&eacute;nesis hipocampal (Matas-Rico et al., 2008), anomal&iacute;as en la mielinizaci&oacute;n postnatal (Contos et al., 2000), modificaci&oacute;n de los niveles de los complejos de prote&iacute;nas sin&aacute;pticas SNARE (Musazzi et al., 2010) y, de manera notable, disminuci&oacute;n de la s&iacute;ntesis de serotonina y de la neurotransmisi&oacute;n por GABA y glutamato (Harrison et al., 2003; Murph et al., 2008, Roberts et al., 2005), as&iacute; como alteraci&oacute;n de los circuitos GABA&eacute;rgicos (Cunningham et al., 2006). Este amplio conjunto de defectos configura un fenotipo de anomal&iacute;as cerebrales estructurales y neuroqu&iacute;micas que se asemeja en gran medida al descrito en la esquizofrenia y en otros modelos murinos aceptados de la patolog&iacute;a (Abi-Dargham, Laruelle, Aghajanian, Charney y Krystal, 1997; Akbarian et al., 1993; Ayhan, Sawa, Ross y Pletnikov, 2009; Benes y Berretta, 2001; Benes, Todtenkopf y Kostoulakos, 2001; Bressan y Pilowsky, 2000; Hennessy, Baldwin, Browne, Kinsella y Waddington, 2007; Honer et al., 2002; Karoutzou, Emrich y Dietrich, 2008; Inta, Monyer, Sprengel, Meyer-Lindenberg y Gass, 2010; Kim, Kornhuber, Schmid-Burgk y Holzmuller, 1980; Noorbala, Akhondzadeh, Davari-Ashtiani y Amini-Nooshabedi, 1999; Ohnuma, Augood, Arai, McKenna y Emson, 1999; Selemon y Goldman-Rakic, 1999; van Haren et al., 2008).</font></p>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">En los animales modificados gen&eacute;ticamente, al no ser posible la determinaci&oacute;n de los s&iacute;ntomas positivos y negativos de una persona, por su especificidad, las pruebas de comportamiento para evaluar los s&iacute;ntomas de una esquizofrenia se centran &uacute;nicamente en observar si presenta hiperactividad locomotora y d&eacute;ficit de la regulaci&oacute;n sensoriomotora. &Eacute;ste &uacute;ltimo se mide a trav&eacute;s del an&aacute;lisis de la inhibici&oacute;n prepulso de la respuesta a sobresaltos, usando un est&iacute;mulo ac&uacute;stico de alta intensidad, precedido por uno de baja intensidad (Braff, Geyer y Swerdlow, 2001; Geyer, Krebs-Thomson, Braff y Swerdlow, 2001; Hoffman e Ison, 1980), y permite analizar la respuesta en el modelo animal de una manera muy similar a la metodolog&iacute;a empleada en pacientes. La alteraci&oacute;n de la inhibici&oacute;n por prepulso se ha observado en cualquier modelo propuesto de esquizofrenia y est&aacute; presente tanto en pacientes bajo tratamiento como a nivel basal en esquizofr&eacute;nicos (Braff et al., 2001). En los ratones carentes del receptor LPA<sub>1</sub> las alteraciones comportamentales son similares a la sintomatolog&iacute;a positiva y negativa, as&iacute; como al d&eacute;ficit cognitivo, que se observan en la esquizofrenia (Arguello y Gogos, 2010; Cosoff y Hafner, 1998; Van de Buuse, 2010; Wolff y O'Driscoll, 1999). As&iacute;, los ratones nulos para LPA<sub>1</sub> muestran una reducci&oacute;n an&oacute;mala de la inhibici&oacute;n prepulso tras el est&iacute;mulo, d&eacute;ficit motor, reducci&oacute;n de conducta exploratoria, defectos en la memoria de referencia espacial, uso de estrategias repetitivas, aumento del comportamiento de tipo ansioso y defectos de memoria de trabajo en tareas que requieren el aprendizaje de la regla operativa (Castilla-Ortega et al., 2010; Harrison et al., 2003; Sant&iacute;n et al., 2009). Igualmente, la alteraci&oacute;n de la neurog&eacute;nesis hipocampal est&aacute; presente tanto en los pacientes esquizofr&eacute;nicos (Kempermann, Krebs y Fabel, 2008; Reif et al., 2006) como en los ratones <i>M&aacute;laga</i> nulos para LPA<sub>1</sub> (Matas-Rico et al, 2008) y cobra relevancia en algunos de los d&eacute;ficits cognitivos, como aquellos relativos a la memoria espacial dependiente de hipocampo (Coras et al., 2010; Goodman et al., 2010; Koehl y Abrous, 2011; Leuner, Gould y Shors, 2006). En este sentido, algunos autores han propuesto un modelo de interacci&oacute;n gen-ambiente en el que una variante en un gen relacionado con la neurog&eacute;nesis y un factor ambiental conferir&iacute;an vulnerabilidad y generar&iacute;an una respuesta de factores que desencadenar&iacute;an, a su vez, un d&eacute;ficit neurog&eacute;nico que causara, finalmente, la esquizofrenia (Le Strat, Ramoz y Gorwood, 2009). Todos estos resultados sugieren que la expresi&oacute;n an&oacute;mala del gen <i>LPAR1</i> en el sujeto puede estar implicada o contribuir a la exacerbaci&oacute;n de los s&iacute;ntomas cognitivos de la esquizofrenia y proporcionar susceptibilidad para el desarrollo de la enfermedad.</font></p>     <p><font face="Verdana" size="2">Se ha sugerido que el LPA puede contribuir al desarrollo de otros trastornos psiqui&aacute;tricos, m&aacute;s all&aacute; de la esquizofrenia, especialmente por el defecto que la deleci&oacute;n del receptor LPA<sub>1</sub> genera en la neurotransmisi&oacute;n mediada por serotonina (Harrison et al., 2003), diana de numerosos f&aacute;rmacos antipsic&oacute;ticos y antidepresivos. Algunos autores han sugerido que en los ratones nulos para LPA<sub>1</sub> la exposici&oacute;n cerebral al LPA circulante, a trav&eacute;s de las hemorragias que presentan, podr&iacute;a tener un efecto en el microambiente cerebral y contribuir a la patolog&iacute;a, tal y como ocurre en enfermedades donde la p&eacute;rdida de sangre materna o fetal prenatal se asocia a la sintomatolog&iacute;a, como en la esquizofrenia o el autismo. De hecho, el crecimiento cortical mediado por la exposici&oacute;n a LPA descrito in vitro, semejante al proceso de girificaci&oacute;n que concurre en ambas patolog&iacute;as, apoyar&iacute;a esta hip&oacute;tesis (Choi et al., 2008; Kingsbury et al., 2003). Tambi&eacute;n se ha demostrado que el LPA puede inhibir los efectos celulares que en la astroglia son mediados por la risperidona, un neurol&eacute;ptico usado para mejorar los s&iacute;ntomas del autismo (Quincozes-Santos et al., 2008). Otros autores han relacionado al LPA con el trastorno bipolar de tipo I debido a las observaciones que describen una respuesta m&aacute;s r&aacute;pida de movilizaci&oacute;n de calcio estimulada por LPA en l&iacute;neas celulares de linfoblastos B de pacientes con dicho trastorno (Perova, Wasserman, Li y Warsh, 2008) de acuerdo a las anomal&iacute;as en la din&aacute;mica del calcio intracelular presentes en la fisiopatolog&iacute;a del trastorno bipolar (Emamghoreishi et al., 1997). Dicha respuesta a LPA puede, a su vez, ser modificada y atenuada con estabilizadores del &aacute;nimo como el litio o el valproato (Perova, Kwan, Li y Warsh, 2010). Muchos datos, en definitiva, relacionan al LPA con mecanismos presentes en las patolog&iacute;as de tipo psiqui&aacute;trico. Hasta la fecha, se ha demostrado que el LPA es un factor clave de diferentes mecanismos de transducci&oacute;n de se&ntilde;al en una amplia variedad de c&eacute;lulas y tejidos, tanto en estado normal como patologico. A pesar de las numerosas cuestiones a&uacute;n por responder en relaci&oacute;n a la funci&oacute;n que desempe&ntilde;a el LPA en la patogenia de trastornos del comportamiento y psiqui&aacute;tricos, estas investigaciones aportan nueva e interesante informaci&oacute;n que sumar a los estudios en curso para el dise&ntilde;o de terapias efectivas.</font></p>     <p><font face="Verdana" size="2">Por otra parte, es preciso contar, adem&aacute;s, con los factores externos, ambientales, que pueden contribuir al desarrollo de patolog&iacute;as y trastornos de la conducta. El estr&eacute;s juega, en este sentido, un importante papel en el desarrollo y exacerbaci&oacute;n de las enfermedades psiqui&aacute;tricas. El estr&eacute;s se podr&iacute;a definir, entre otras acepciones, como el modo en que el cuerpo y la mente reaccionan ante un acontecimiento que desestabiliza el equilibrio normal en nuestra vida. El estr&eacute;s a corto plazo, o agudo, implica una respuesta inmediata ante cualquier situaci&oacute;n que se entiende como imperativa o peligrosa. Generalmente el cuerpo se recupera r&aacute;pidamente de este tipo de estr&eacute;s, si bien depende de la frecuencia de exposici&oacute;n al estresor. El estr&eacute;s cr&oacute;nico, por contra, es un proceso a largo plazo causado por situaciones estresantes o acontecimientos diarios que permanecen por un largo periodo de tiempo y con un impacto perjudicial considerable en nuestra salud. Los estresores, que act&uacute;an de manera adversa en nuestra vida diaria, junto al estado emocional del individuo, pueden alterar significativamente nuestra fisiolog&iacute;a, especialmente a nivel cerebral. En nuestra sociedad el estr&eacute;s continuo es bastante frecuente y las consecuencias patol&oacute;gicas est&aacute;n bien documentadas, generando alteraciones emocionales y cognitivas acompa&ntilde;adas de defectos en la neurog&eacute;nesis hipocampal (Gould y Tanapat, 1999; Henckens, Hermans, Pu, J&ouml;els y Fernandez, 2009; J&ouml;els y Baram, 2009; J&ouml;els, Fern&aacute;ndez y Roozendaal, 2001; J&ouml;els, Karst, Krugers y Lucassen, 2007; McEwen, 2000; Pittenger y Duman, 2008; Schwabe, J&ouml;els, Roozendaal, Wolf y Oitzl, 2011; Warner-Schmidt y Durnan, 2006). Por otro lado, los defectos en neurog&eacute;nesis constituyen un elemento determinante en patolog&iacute;as psiqui&aacute;tricas como la depresi&oacute;n o la esquizofrenia y pueden explicar la contribuci&oacute;n del estr&eacute;s a su desarrollo (Kempermann, Krebs y Fabel, 2008; Pittenger y Duman, 2008; Warner-Schmidt y Durnan, 2006). Recientemente, adem&aacute;s de las funciones previamente descritas, hemos obtenido resultados que indican que la v&iacute;a de se&ntilde;alizaci&oacute;n mediada por LPA<sub>1</sub> act&uacute;a como importante modulador de los efectos del estr&eacute;s cr&oacute;nico sobre la neurog&eacute;nesis hipocampal y la memoria espacial (Castilla-Ortega et al., 2011). El estudio se basa en el papel que presenta el receptor LPA<sub>1</sub> en la neurog&eacute;nesis adulta del hipocampo y en el efecto del estr&eacute;s cr&oacute;nico sobre &eacute;sta, en t&eacute;rminos de plasticidad estructural. As&iacute;, el receptor LPA<sub>1</sub> podr&iacute;a, igualmente, regular el impacto del estr&eacute;s cr&oacute;nico sobre la neurog&eacute;nesis del giro dentado y la conducta dependiente de hipocampo, y su falta conferir&iacute;a vulnerabilidad al estr&eacute;s cr&oacute;nico. El empleo del laberinto de hoyos, como prueba de evaluaci&oacute;n, en combinaci&oacute;n con el estr&eacute;s por inmovilizaci&oacute;n, como modelo experimental, nos ha permitido demostrar que la ausencia del receptor LPA<sub>1</sub> en los ratones <i>M&aacute;laga</i> nulos para LPA<sub>1</sub> aumenta la severidad de los efectos adversos del estr&eacute;s cr&oacute;nico sobre la proliferaci&oacute;n celular, apoptosis, maduraci&oacute;n neuronal, volumen, y densidad neuronal de la zona granular del hipocampo. Estas deficiencias se correlacionan, en estos animales, con un importante d&eacute;ficit en la consolidaci&oacute;n de la memoria de referencia espacial, en contraste con el efecto mucho menor del estr&eacute;s cr&oacute;nico en los animales normales. El estudio demuestra que el estr&eacute;s cr&oacute;nico aumenta la severidad de los defectos dependientes del receptor LPA<sub>1</sub> y que una carencia o una deficiencia en la expresi&oacute;n del receptor aportar&iacute;an mayor vulnerabilidad al estr&eacute;s cr&oacute;nico, precipitando la patolog&iacute;a hipocampal. Estos resultados tambi&eacute;n apoyan la conveniencia de usar animales nulos para los receptores de LPA en los estudios de las interacciones gen&eacute;tico-ambientales con relevancia en psiquiatr&iacute;a, tanto por la implicaci&oacute;n propuesta del receptor LPA<sub>1</sub> en la esquizofrenia, como por la vulnerabilidad a estr&eacute;s que se muestra en dicha patolog&iacute;a (Norman y Malla, 1993).</font></p>     <p><font face="Verdana" size="2">Como se ha mencionado anteriormente, la se&ntilde;alizaci&oacute;n por LPA est&aacute; implicada en numerosos procesos cerebrales que afectan a la funci&oacute;n cerebral incluyendo, tambi&eacute;n, el comportamiento. Los estudios citados subrayan el papel que el LPA juega en el comportamiento haciendo uso de una variada tecnolog&iacute;a que incluye t&eacute;cnicas bioqu&iacute;micas, gen&eacute;ticas, histol&oacute;gicas, o pruebas comportamentales. La complejidad de las interacciones entre las diferentes estructuras cerebrales, su regulaci&oacute;n endocrina, modulaci&oacute;n ambiental, o los factores gen&eacute;ticos o de predisposici&oacute;n que las condicionan, hacen necesarios futuros estudios para delimitar la funci&oacute;n de esta v&iacute;a de se&ntilde;alizaci&oacute;n en cada circunstancia. Aunque, indudablemente, estos resultados abren v&iacute;as para abordar nuevas intervenciones en psicopatolog&iacute;a, el amplio rango de efectos sobre el comportamiento in vivo, su relevancia para los trastornos psiqui&aacute;tricos y su potencial terap&eacute;utico nos obligan a ser cautos en la interpretaci&oacute;n de los resultados y a trabajar en diferentes dise&ntilde;os experimentales que deben incluir, tanto los modelos animales carentes del receptor, como una adecuada modulaci&oacute;n farmacol&oacute;gica de los receptores.</font></p>     <p>&nbsp;</p> <hr width="30%" size="1" align="left">     <p><font face="Verdana" size="2">Queremos expresar nuestro m&aacute;s sincero agradecimiento a cada investigador del &aacute;rea, cuyo trabajo ha supuesto una indudable e importante contribuci&oacute;n al campo, a la vez que manifestamos nuestra disculpa por las omisiones, no intencionadas. Tambi&eacute;n agradecemos al Dr. Jerold Chun su apoyo y colaboraci&oacute;n continuos.</font></p>     <p>&nbsp;</p>     <p><font face="Verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p><font face="Verdana" size="2">1. Abi-Dargham, A., Laruelle, M., Aghajanian, G.K., Charney, D. y Krystal, J. (1997). The role of serotonin in the pathophysiology and treatment of schizophrenia. <i>Journal of Neuropsychiatry and Clinical Neurosciences, 9</i>, 1-17.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=2151496&pid=S1989-3809201100030000100001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>    ]]></body>
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<body><![CDATA[<br>Hospital Materno-Infantil.    <br>Planta Baja (junto a Hematolog&iacute;a).    <br>Avenida Arroyo de los &Aacute;ngeles s/n,    <br>29009 M&aacute;laga.    <br>E-mail: <a href="mailto:guillermo.estivill@fundacionimabis.org">guillermo.estivill@fundacionimabis.org</a>.    <br>Correo electr&oacute;nico de los autores: Luis Javier Sant&iacute;n: <a href="mailto:luis@uma.es">luis@uma.es</a>,    <br>Carmen Pedraza: <a href="mailto:mdpedraza@uma.es">mdpedraza@uma.es</a>,    <br>Estela Castilla-Ortega: <a href="mailto:ecastilla@uma.es">ecastilla@uma.es</a>,    <br>Fernando Rodr&iacute;guez de Fonseca: <a href="mailto:fernando.rodriguez@fundacionimabis.org">fernando.rodriguez@fundacionimabis.org</a>.</font></p>     <p><font face="Verdana" size="2">Fecha de recepci&oacute;n: 29 de agosto de 2011    ]]></body>
<body><![CDATA[<br>Fecha de aceptaci&oacute;n: 15 de septiembre de 2011</font></p>      ]]></body><back>
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