<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932004000400006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Aspectos neurobiológicos de la psicopatía]]></article-title>
<article-title xml:lang="en"><![CDATA[NEUROBIOLOGICAL ASPECTS OF PSYCHOPATHY]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[MEJÍA MOSQUERA]]></surname>
<given-names><![CDATA[CARLOS ANDRÉS]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GARCÍA VALENCIA]]></surname>
<given-names><![CDATA[JENNY]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PALACIO ACOSTA]]></surname>
<given-names><![CDATA[CARLOS ALBERTO]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[CORREA RICO]]></surname>
<given-names><![CDATA[OSCAR ANDRÉS]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GIL RESTREPO]]></surname>
<given-names><![CDATA[CATALINA]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ARANGO VIANA]]></surname>
<given-names><![CDATA[JUAN CARLOS]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
</contrib-group>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Departamento de Psiquiatría]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Escuela de Investigaciones Médicas Aplicadas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A05">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A06">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Departamento de Patología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2004</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2004</year>
</pub-date>
<volume>17</volume>
<numero>4</numero>
<fpage>370</fpage>
<lpage>382</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932004000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932004000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932004000400006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[LA PSICOPATÍA ES UN CONSTRUCTO PSIQUIÁTRICO caracterizado por un patrón permanente de déficit afectivo y una falta de respeto por los derechos de los demás y por las normas sociales. El término equivale al ''trastorno de personalidad antisocial'' DSM-IV-TR y al ''Trastorno disocial de personalidad'' de la Clasificación Internacional de Enfermedades (CIE-10). Los individuos afectados comienzan a presentar características psicopáticas desde la niñez, son propensos a involucrarse en conductas criminales pero no a resocializarse con los programas penitenciarios, y reinciden con más rapidez, crueldad y violencia que los criminales no psicópatas. La etiopatogenia parece basarse en la interacción compleja de factores biológicos y psicosociales. El objetivo del presente artículo es presentar una revisión actualizada de los aspectos neurobiológicos de la psicopatía entre los cuales se encuentran los obstétricos, neuroanatómicos, neuroquímicos y genéticos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Psychopathy is a psychiatric construct characterized by a permanent pattern of affective deficit, and a lack of respect for the rights of other people and the social norms. The term is equivalent to the ''Antisocial personality disorder'' of the DSMIV- TR, and to the ''Dissocial personality disorder'' of the CIE-10. Since childhood, the affected individuals begin to display psychopathic characteristics and they have tendency to become involved in criminal behaviors but not to resocialice themselves with penitentiary programs; they reoffend more rapidly, with more cruelty and violence than non-psychopathic criminals. Etiopathogenesis of psychopathy is based on the complex interaction of biological and psychosocial factors. The objective of the present article is to provide an updated review about the neurobiological aspects of psychopathy among them the obstetric, neuroanatomical, neurochemical and genetic.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[PSICOPATÍA]]></kwd>
<kwd lng="es"><![CDATA[TRASTORNO DE PERSONALIDAD ANTISOCIAL]]></kwd>
<kwd lng="es"><![CDATA[VIOLENCIA]]></kwd>
<kwd lng="en"><![CDATA[ANTISOCIAL PERSONALITY DISORDER]]></kwd>
<kwd lng="en"><![CDATA[PSYCHOPATHY]]></kwd>
<kwd lng="en"><![CDATA[VIOLENCE]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="4" face="Verdana, Arial, Helvetica, sans-serif"><b>Aspectos neurobiol&oacute;gicos de la psicopat&iacute;a</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>NEUROBIOLOGICAL ASPECTS OF PSYCHOPATHY</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> CARLOS ANDR&Eacute;S MEJ&Iacute;A MOSQUERA<sup>1</sup>; JENNY GARC&Iacute;A VALENCIA<sup>2</sup>; CARLOS ALBERTO PALACIO ACOSTA<sup>3</sup>;   OSCAR ANDR&Eacute;S CORREA RICO<sup>4</sup>; CATALINA GIL RESTREPO<sup>5</sup>; JUAN CARLOS ARANGO VIANA<sup>6</sup></b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 1. M&eacute;dico-Cirujano</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">2. M&eacute;dica-Cirujana, Especialista en Psiquiatr&iacute;a, MSc en Epidemiolog&iacute;a. Profesora del Departamento de Psiquiatr&iacute;a, Facultad   de Medicina, Universidad de Antioquia</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 3. M&eacute;dico-Cirujano, Especialista en Psiquiatr&iacute;a, MSc Epidemiolog&iacute;a. Jefe de la Escuela de Investigaciones M&eacute;dicas Aplicadas,   Facultad de Medicina, Universidad de Antioquia.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 4. M&eacute;dico-Cirujano, Estudiante de segundo a&ntilde;o de especializaci&oacute;n en Psiquiatr&iacute;a, Facultad de Medicina, Universidad de   Antioquia   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">5. Estudiante de s&eacute;ptimo semestre de Medicina, Facultad de Medicina, Universidad de Antioquia   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">6. M&eacute;dico-Cirujano, Especialista en Patolog&iacute;a, PhD en Neuropatolog&iacute;a. Profesor del Departamento de Patolog&iacute;a, Facultad   de Medicina, Universidad de Antioquia.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Grupo de Investigaci&oacute;n en Neurobiolog&iacute;a de la Violencia &#40;Departamento de Psiquiatr&iacute;a, Departamento de Patolog&iacute;a y   Escuela de Investigaciones M&eacute;dicas Aplicadas&#41;, Facultad de Medicina, Universidad de Antioquia.</font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>LA PSICOPAT&Iacute;A ES UN CONSTRUCTO PSIQUI&Aacute;TRICO</b> caracterizado por un patr&oacute;n permanente   de d&eacute;ficit afectivo y una falta de respeto por los derechos de los   dem&aacute;s y por las normas sociales. El t&eacute;rmino equivale al ''trastorno de personalidad   antisocial'' DSM-IV-TR y al ''Trastorno disocial de personalidad'' de la   Clasificaci&oacute;n Internacional de Enfermedades &#40;CIE-10&#41;. Los individuos afectados   comienzan a presentar caracter&iacute;sticas psicop&aacute;ticas desde la ni&ntilde;ez, son propensos   a involucrarse en conductas criminales pero no a resocializarse con los programas   penitenciarios, y reinciden con m&aacute;s rapidez, crueldad y violencia que los criminales   no psic&oacute;patas. La etiopatogenia parece basarse en la interacci&oacute;n compleja   de factores biol&oacute;gicos y psicosociales. El objetivo del presente art&iacute;culo es presentar   una revisi&oacute;n actualizada de los aspectos neurobiol&oacute;gicos de la psicopat&iacute;a entre   los cuales se encuentran los obst&eacute;tricos, neuroanat&oacute;micos, neuroqu&iacute;micos y   gen&eacute;ticos. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>PALABRAS CLAVE</b>   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><i>PSICOPAT&Iacute;A,   TRASTORNO DE PERSONALIDAD ANTISOCIAL,   VIOLENCIA</i>   </font></p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Psychopathy is a psychiatric construct   characterized by a permanent pattern of affective   deficit, and a lack of respect for the rights of other   people and the social norms. The term is equivalent   to the ''Antisocial personality disorder'' of the DSMIV-   TR, and to the ''Dissocial personality disorder''   of the CIE-10. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Since childhood, the affected individuals begin to   display psychopathic characteristics and they have   tendency to become involved in criminal behaviors   but not to resocialice themselves with penitentiary   programs; they reoffend more rapidly, with more   cruelty and violence than non-psychopathic   criminals.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Etiopathogenesis of psychopathy is based on the   complex interaction of biological and psychosocial   factors. The objective of the present article is to   provide an updated review about the   neurobiological aspects of psychopathy among   them the obstetric, neuroanatomical,   neurochemical and genetic. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>KEY WORDS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <i>ANTISOCIAL PERSONALITY DISORDER,   PSYCHOPATHY,   VIOLENCE</i> </font></p> <hr noshade size="1">     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODUCCI&Oacute;N</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>LA PSICOPAT&Iacute;A ES UN CONSTRUCTO PSIQUI&Aacute;TRICO</b>   caracterizado por un patr&oacute;n permanente de   profundo d&eacute;ficit afectivo, acompa&ntilde;ado por una   falta de respeto por los derechos de los dem&aacute;s y   por las normas sociales &#40;1&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> A finales del siglo XIX el adjetivo psicop&aacute;tico se   aplicaba a cualquier forma de trastorno mental.   Posteriormente, Koch, Gross, Morel y otros   restringieron el concepto a formas menos graves   de enfermedad; lo consideraron un trastorno de   la personalidad con un patr&oacute;n permanente de   comportamiento que produce malestar o perjuicios   para el sujeto y/o las personas que lo rodean. Luego,   la personalidad psicop&aacute;tica empez&oacute; a ser una   subclase de un grupo mayor de personalidades   anormales &#40;1&#41;. Actualmente, el t&eacute;rmino psicopat&iacute;a   no aparece dentro de la nosolog&iacute;a oficial, pero se   considera que es equivalente al ''Trastorno de   personalidad antisocial'' del DSM-IV-TR &#40;2&#41; &#40;<a href="img/revistas/iat/v17n4/v17n4a6t1.jpg" target="_blank">Tabla   N&#176; 1</a>&#41; y al ''Trastorno disocial de personalidad'' de   la CIE-10&#40;3&#41; &#40;<a href="img/revistas/iat/v17n4/v17n4a6t2.jpg" target="_blank">Tabla N&#176; 2</a>&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los individuos con psicopat&iacute;a son arrogantes,   manipuladores, irritables, impulsivos,   irresponsables, sin fuertes v&iacute;nculos emocionales,   carentes de empat&iacute;a y remordimiento y propensos   a conductas criminales. Empiezan sus actividades   delictivas en la ni&ntilde;ez y permanecen en ellas la mayor   parte de sus vidas &#40;4,5&#41;. Se ha observado que no   se benefician de los planes penitenciarios de   resocializaci&oacute;n, reinciden m&aacute;s r&aacute;pida y   violentamente en el crimen, y son m&aacute;s crueles que   los criminales sin psicopat&iacute;a &#40;6-11&#41;. Estos sujetos   presentan comorbilidad con juego patol&oacute;gico,   trastornos por uso de sustancias y problemas de   control de impulsos &#40;12&#41;. No es clara la relaci&oacute;n   entre estos &uacute;ltimos y la psicopat&iacute;a pues se ignora   si son causa, efecto o parte de un mismo espectro   &#40;13&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La etiopatogenia de la psicopat&iacute;a parece basarse   en interacciones complejas de factores   psicosociales y biol&oacute;gicos &#40;11,14&#41;. En este art&iacute;culo   se revisa la literatura actual relacionada con los   aspectos neurobiol&oacute;gicos de la psicopat&iacute;a. De estos,   los que se han asociado a la etiopatogenia de dicho   trastorno son los obst&eacute;tricos, neuroanat&oacute;micos,   neuroqu&iacute;micos y gen&eacute;ticos.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>ASPECTOS OBST&Eacute;TRICOS</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>EL CONSUMO DE TABACO POR LA MADRE </b>durante el   embarazo est&aacute; relacionado con la delincuencia en   el hijo &#40;15&#41;. Adem&aacute;s, los criminales con   antecedentes de complicaciones intraparto son   m&aacute;s agresivos &#40;16&#41;.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>ASPECTOS   NEUROANAT&Oacute;MICOS</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>EN SUJETOS CON PSICOPAT&Iacute;A,</b> se ha implicado la corteza   orbitofrontal, con base en los siguientes hallazgos:   1&#41; cambios de comportamiento secundarios a   lesiones en esta &aacute;rea &#40;17&#41;; 2&#41; disfunci&oacute;n   neuropsicol&oacute;gica orbitofrontal y ventromedialfrontal   &#40;18-20&#41;; 3&#41; estudios imaginol&oacute;gicos que   han mostrado reducci&oacute;n del volumen de la sustancia gris prefrontal; y 4&#41; investigaciones con   potenciales evocados que han encontrado   disminuci&oacute;n en la amplitud de la onda P300 en los   sitios de los electrodos frontales &#40;21-23&#41;.   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Tambi&eacute;n se ha sugerido compromiso del l&oacute;bulo   temporal y del sistema l&iacute;mbico por las siguientes   razones: 1&#41; la agresividad que muestran individuos   con lesiones anteroinferiores del l&oacute;bulo temporal   &#40;24&#41;; 2&#41; anormalidades estructurales y funcionales   del hipocampo, la am&iacute;gdala, el n&uacute;cleo estriado   ventral y el giro c&iacute;ngulo, demostradas en individuos   con psicopat&iacute;a por t&eacute;cnicas de neuroim&aacute;genes   funcionales &#40;25-28&#41;; 3&#41; presencia en los individuos   con psicopat&iacute;a de alteraciones en funciones relacionadas   con las conexiones del sistema l&iacute;mbico con la corteza orbitofrontal, manifestadas como: disminuci&oacute;n   en la respuesta electrod&eacute;rmica al estr&eacute;s,   insensibilidad al castigo y dificultades para reconocer   las expresiones faciales y los tonos vocales   de miedo y de tristeza &#40;26,29-34&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los individuos con psicopat&iacute;a tienen aumento en   el volumen y la longitud del cuerpo calloso que   est&aacute;n asociados con d&eacute;ficit afectivo y baja   reactividad auton&oacute;mica al estr&eacute;s &#40;26,35&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El hipot&aacute;lamo tambi&eacute;n puede estar asociado con   la psicopat&iacute;a, pues en modelos animales se ha   demostrado agresi&oacute;n al estimular el &aacute;rea   hipotal&aacute;mica intermedia ubicada por debajo del   f&oacute;rnix y por delante del n&uacute;cleo medial &#40;36&#41;. Dicha   agresi&oacute;n es facilitada por la testosterona e inhibida   por la castraci&oacute;n; adem&aacute;s, est&aacute; acompa&ntilde;ada por   altos niveles de corticosterona y es suprimida por   agonistas de los receptores de serotonina 1B   &#40;5HT1B&#41; &#40;37&#41;.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>ASPECTOS HORMONALES   Y NEUROQU&Iacute;MICOS </b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ENTRE LAS HORMONAS QUE SE HAN ASOCIADO</b> a la psicopat&iacute;a   est&aacute;n: testosterona, prolactina,   foliculoestimulante, luteinizante, corticotropina,   alfa-melanocito-estimulante, beta-endorfinas,   arginina-vasopresina y corticosterona; estas hormonas   afectan el comportamiento agresivo en   animales con mecanismos posiblemente mediados   por la serotonina &#40;5-HT&#41;&#40;36-38&#41;. Adem&aacute;s, se han   encontrado concentraciones basales bajas de   cortisol en la sangre y concentraciones altas de   testosterona en el l&iacute;quido cefalorraqu&iacute;deo &#40;LCR&#41;   de individuos con psicopat&iacute;a &#40;39,40&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Se ha demostrado asociaci&oacute;n de la psicopat&iacute;a con   disminuci&oacute;n de la funci&oacute;n del sistema   serotonin&eacute;rgico. En criminales con psicopat&iacute;a se   han encontrado mayores niveles plasm&aacute;ticos de   triptofano, amino&aacute;cido precursor de la 5-HT, el cual   se correlaciona positivamente con puntuaciones en   las escalas de agresi&oacute;n &#40;41,42&#41;. Adicionalmente,   en ratas poco agresivas se ha encontrado aumento   en la actividad de la triptofano-hidroxilasa &#40;TPH&#41;,   enzima que participa en la s&iacute;ntesis de la 5-HT y,   por el contrario, su actividad est&aacute; reducida en   humanos con conductas impulsivas &#40;43&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La respuesta de la prolactina a los retos   farmacol&oacute;gicos es un &iacute;ndice din&aacute;mico de la funci&oacute;n   serotonin&eacute;rgica &#40;44&#41;. Los individuos con psicopat&iacute;a   tienen una menor respuesta de la prolactina a los   agonistas de la 5-HT tales como mclorofenilpiperazina   y d-fenfluramina y esta   respuesta se correlaciona inversamente con   agresi&oacute;n e impulsividad &#40;40,45-47&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Con respecto a los receptores 5-HT, se han   implicado el 5-HT1A, 5-HT1B y el 5-HT2A. En   roedores, los receptores 5-HT1A y 5-HT1B se   encuentran en el septum pellucidum, la am&iacute;gdala,   los nucleos del raf&eacute; y el &aacute;rea pre&oacute;ptica medial del   hipot&aacute;lamo, estructuras que han sido implicadas   en la agresi&oacute;n &#40;48&#41;. As&iacute; mismo, estudios postmortem   en v&iacute;ctimas de suicidio, quienes con frecuencia   tienen comportamiento impulsivo, han encontrado   reducci&oacute;n en la densidad de los transportadores   de serotonina y mayor densidad de receptores   postsin&aacute;pticos 5-HT1A y 5-HT2A &#40;49,50&#41;. En cepas   agresivas de ratas se encontr&oacute; aumento de la   regulaci&oacute;n de los receptores 5HT1A &#40;51&#41;. Las drogas   con actividad selectiva en los receptores 5-HT1   reducen la agresi&oacute;n ofensiva &#40;48&#41;. Los ratones que   no tienen el receptor 5-HT1B son m&aacute;s agresivos   &#40;36&#41;. En humanos, se ha demostrado menor   densidad de receptores 5-HT2A plaquetarios en hijos   de delincuentes &#40;52&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El &aacute;cido 5-hidroxi-indolac&eacute;tico &#40;5-HIAA&#41; es un   metabolito de la 5-HT. En pacientes con   comportamiento agresivo y en criminales violentos   se ha encontrado que las concentraciones de 5-   HIAA en el LCR son menores que en los controles   &#40;53&#41;. El 5-HIAA en el LCR est&aacute; inversamente   correlacionado con agresi&oacute;n, irritabilidad, hostilidad   y actividad criminal, lo cual no parece ser explicado   por la historia de uso de sustancias, ni por la edad   o la administraci&oacute;n de medicamentos &#40;54&#41;. Con el   &aacute;cido homovan&iacute;lico &#40;HVA&#41;, que es un metabolito   de la dopamina, se calcula la raz&oacute;n HVA:5-HIAA   que indica la modulaci&oacute;n serotonin&eacute;rgica de la   actividad de la dopamina. Esta &uacute;ltima parece estar   deteriorada en los individuos con psicopat&iacute;a ya que   la raz&oacute;n HVA:5-HIAA est&aacute; fuertemente   correlacionada con los rasgos psicop&aacute;ticos &#40;55&#41;.   Con respecto a la dopamina, se ha encontrado que   los hijos de sujetos con psicopat&iacute;a tienen menor   actividad de la dopamina-beta-hidroxilasa que es   una enzima que facilita la conversi&oacute;n de dopamina   a norepinefrina &#40;56&#41;. Adem&aacute;s, mediante t&eacute;cnicas   de neuroim&aacute;genes se ha observado una estructura   anormal en los sitios de recaptaci&oacute;n de dopamina   &#40;57&#41;. Tambi&eacute;n se ha reportado disminuci&oacute;n en la   respuesta de la hormona del crecimiento &#40;HC&#41; a la   bromocriptina en adictos a la hero&iacute;na con   psicopat&iacute;a y se ha visto correlaci&oacute;n inversa entre   los puntajes de antisocialidad y respuesta de la HC,   lo cual puede reflejar una disminuci&oacute;n de la   sensibilidad de los receptores de dopamina en   algunas &aacute;reas cerebrales &#40;47&#41;.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La monoamino-oxidasa &#40;MAO-A&#41; cataliza la   degradaci&oacute;n de la 5-HT, la noradrenalina y la   dopamina. La inhibici&oacute;n de la MAO-A se   correlaciona con reducci&oacute;n de la agresi&oacute;n en   ratones, probablemente por incremento de los   niveles de 5-HT. Sin embargo, la ablaci&oacute;n del gen   que codifica la MAO-A lleva a aumentos en la   agresi&oacute;n ofensiva, a pesar de los altos niveles de 5-   HT. Posiblemente la deficiencia cr&oacute;nica de MAO   induzca aumento de la regulaci&oacute;n de los receptores   de adenosina y anormalidades en los receptores   5-HT &#40;36&#41;. La actividad de la MAO plaquetaria se   ha encontrado baja en los individuos con   impulsividad y psicopat&iacute;a, est&aacute; asociada con el 5-   HIAA en el LCR y tiene una correlaci&oacute;n inversa con   las puntuaciones en escalas de b&uacute;squeda de   sensaciones e impulsividad &#40;58&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El &oacute;xido n&iacute;trico &#40;NO&#41; sirve como un modulador de   la agresi&oacute;n. Los ratones que no tienen oxidon&iacute;tricosintetasa   y aquellos en que la acci&oacute;n de esa enzima   ha sido suprimida farmacol&oacute;gicamente, son muy   agresivos. El NO parece afectar el comportamiento   agresivo por la v&iacute;a de la 5-HT a trav&eacute;s de   disminuci&oacute;n en el recambio de 5-HT y disfunci&oacute;n   de los receptores 5-HT1A y HT1B &#40;59&#41;.   </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>ASPECTOS GEN&Eacute;TICOS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> LOS SUJETOS CON PSICOPAT&Iacute;ATIENEN CON FRECUENCIA</b>   otros familiares en primer grado con el mismo   trastorno &#40;60&#41;. Los estudios de adopci&oacute;n han   mostrado que hay contribuci&oacute;n de factores   gen&eacute;ticos y ambientales ya que los hijos biol&oacute;gicos   y adoptivos de los sujetos con psicopat&iacute;a tienen   alto riesgo de presentarla &#40;61&#41;. Los estudios en   gemelos muestran que la influencia gen&eacute;tica explica   entre el 32 y el 71&#37; de la varianza fenot&iacute;pica. Las   variaciones en estos estimativos son resultado de   diferencias en la definici&oacute;n del fenotipo, la selecci&oacute;n   de la muestra y la naturaleza prospectiva o   retrospectiva de los estudios &#40;62,63&#41;.   Polimorfismos en la TPH se han asociado con el   comportamiento impulsivo y agresivo &#40;64&#41;.   Polimorfismos en el intr&oacute;n 7 &#40;A218C y A779C&#41; se   han relacionado con conductas impulsivas como   el suicidio &#40;64,65&#41; y, en el caso del alelo 779C &#40;alelo   L&#41;, tambi&eacute;n con el alcoholismo antisocial &#40;64&#41;. Otros   estudios no han encontrado dichas asociaciones   &#40;66,67&#41;.}</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Un polimorfismo en el gen que codifica el   transportador de la 5-HT conocido como ''5HTT   ligado a la regi&oacute;n polim&oacute;rfica'' &#40;5HTTLPR&#41; es una   repetici&oacute;n variable de nucle&oacute;tidos &#40;VNTR&#41; de 22   pares de bases. Son comunes dos alelos, uno con   16 repeticiones o ''largo'' &#40;L&#41; y otro con 14   repeticiones o ''corto'' &#40;S&#41;, y han sido asociados   con ansiedad, suicidio y alcoholismo antisocial &#40;68&#41;.   Se ha observado que los homocigotos para el alelo   S son m&aacute;s impulsivos que aquellos con otros   genotipos &#40;69,70&#41;. En Finlandia el alelo S del   5HTTLPR se encontr&oacute; m&aacute;s frecuentemente en   alcoh&oacute;licos antisociales &#40;71,72&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Polimorfismos en los genes que codifican para los   receptores 5-HT1B, 5-HT2A y 5-HT2C &#40;5HTR1B,   5HTR2A y 5HTR2C&#41;, respectivamente, han sido   relacionados con el alcoholismo, la psicopat&iacute;a y la   impulsividad. La sobreexpresi&oacute;n del alelo 861C del   HTR1B en una poblaci&oacute;n de criminales finlandeses   sugiere que este polimorfismo aumenta el riesgo   de desarrollar conductas delictivas &#40;73&#41;, pero estos   hallazgos no fueron reproducidos en otro grupo   &eacute;tnico &#40;73&#41;. En poblaci&oacute;n alemana, la frecuencia   del alelo 861G del HTR1B fue m&aacute;s alta en   alcoh&oacute;licos &#40;74&#41;. Por otro lado, el alelo 861C se   encontr&oacute; sobreexpresado en alcoh&oacute;licos &#40;75&#41; y se   ha sugerido que tiene un efecto dosis-dependiente   en el riesgo de desarrollar abuso de drogas &#40;76&#41;.   Otros estudios no han encontrado las relaciones   mencionadas &#40;77-79&#41;. Se han reportado otros   polimorfismos en este gen &#40;A161T, A180G, T261G,   C129T&#41;, al igual que deleciones &#40;184/183, 182/181&#41;   pero ninguno de estos polimorfismos se encontr&oacute;   relacionado con farmacodependencia o psicopat&iacute;a   &#40;78,80&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El polimorfismo G1438A del 5HTR2A se estudi&oacute; en   criminales suizos y en donadores de sangre y se   encontr&oacute; que el genotipo GG estuvo   significativamente reducido en el grupo de   criminales &#40;78,81&#41;. En contraste, en alemanes se   ha descrito una asociaci&oacute;n significativa entre el alelo   1438A y el alcoholismo antisocial &#40;82&#41;. El genotipo   102CC, &#40;otro polimorfismo del 5HTR2A&#41;, se   encontr&oacute; relacionado con el uso de drogas y la   impulsividad, comparado con los otros dos   genotipos &#40;TT,TC&#41; &#40;83&#41; y la frecuencia del alelo   T102 se encontr&oacute; disminuida en pacientes varones,   alcoh&oacute;licos antisociales &#40;78,84&#41;.Polimorfismos en   el 5HTR2C han sido asociados con el alcoholismo y   el comportamiento violento en una muestra   finlandesa &#40;85&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El alelo A1 del receptor 2 de la dopamina &#40;DRD2&#41;   se encontr&oacute; sobreexpresado en alcoh&oacute;licos   espa&ntilde;oles que ten&iacute;an prevalencias m&aacute;s altas de   psicopat&iacute;a que aquellos con el genotipo A2/A2 &#40;86&#41;.   En Brasil se obtuvieron resultados semejantes &#40;87&#41;.   El alelo A1 se encontr&oacute; con una frecuencia   significativamente m&aacute;s alta en jugadores   patol&oacute;gicos &#40;frecuente comorbilidad del trastorno   de personalidad antisocial&#41; que en controles   &#40;50.9&#37; vs. 25.9&#37;, p&#60; 0,00000001&#41; &#40;88&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El receptor 4 de la dopamina &#40;DRD4&#41; presenta un   polimorfismo de repetici&oacute;n &#40;48 pares de bases&#41; en   el ex&oacute;n 3, el cual contiene un n&uacute;mero variable de   estas repeticiones. El alelo con 7 repeticiones o   ''largo'' se ha asociado con el d&eacute;ficit de atenci&oacute;n e   hiperactividad, el abuso de sustancias, el juego   patol&oacute;gico y la b&uacute;squeda de novedad &#40;89-94&#41;.   Estos resultados no han sido reproducidos por   otros autores &#40;95,96&#41;. Otro polimorfismo en este   receptor consiste en la repetici&oacute;n de 120 pares de   bases en la regi&oacute;n 5' del gen que se ha encontrado   asociada con el alcoholismo &#40;p&#60;0.006&#41;, la   impulsividad &#40;p&#60;0.0006&#41; y la b&uacute;squeda de   novedad, principalmente en los pacientes   homocigotos &#40;97&#41;.</font></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>CONCLUSIONES</b></font></p> <ul>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  La psicopat&iacute;a se presenta por interacciones     complejas entre aspectos psicosociales y     neurobiol&oacute;gicos, que todav&iacute;a no est&aacute;n     totalmente esclarecidas.</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Los estudios imaginol&oacute;gicos, neuropsicol&oacute;gicos     y neurofuncionales han mostrado compromiso     de la corteza orbitofrontal, el hipocampo, la     am&iacute;gdala, el n&uacute;cleo estriado, el c&iacute;ngulo, el     cuerpo calloso y el hipot&aacute;lamo.</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Varios sistemas hormonales est&aacute;n asociados a     la psicopat&iacute;a con mecanismos posiblemente     mediados por la serotonina, cuyo     funcionamiento parece estar disminuido.     Tambi&eacute;n existen hallazgos que sugieren     alteraciones en los sistemas dopamin&eacute;rgicos y     noradren&eacute;rgicos.   </font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La psicopat&iacute;a tiene un componente gen&eacute;tico, el     cual se ha demostrado en estudios de adopci&oacute;n     y con gemelos, y se ha asociado a polimorfismo     en los genes que codifican para la triptofanohidroxilasa,     el transportador de serotonina, los     receptores 5-HT1B, 5-HT2A y 5-HT2C y los     receptores de dopamina de los tipos 2 y 4.</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Los hallazgos han sido contradictorios y     generalmente se han encontrado relacionados     con el alcoholismo y la farmacodependencia.</font></li>       <li><font size="2" face="Verdana, Arial, Helvetica, sans-serif">  Es necesario realizar m&aacute;s estudios que permitan     dilucidar los mecanismos neurobiol&oacute;gicos de la     psicopat&iacute;a lo cual puede contribuir al dise&ntilde;o de     mejores estrategias de tratamiento que las     disponibles actualmente.</font></li>     </ul>     <p>&nbsp;</p>     ]]></body>
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<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recibido: 10 de agosto de 2004    <br> Aceptado: 17 de noviembre de 2004</font></p>      ]]></body><back>
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