<?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>1657-9267</journal-id>
<journal-title><![CDATA[Universitas Psychologica]]></journal-title>
<abbrev-journal-title><![CDATA[Univ. Psychol.]]></abbrev-journal-title>
<issn>1657-9267</issn>
<publisher>
<publisher-name><![CDATA[Pontificia Universidad Javeriana]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1657-92672016000500018</article-id>
<article-id pub-id-type="doi">10.11144/Javeriana.upsy15-5.rmoi</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Rol Modulador de la Oxitocina en la Interacción Social y el Estrés Social]]></article-title>
<article-title xml:lang="en"><![CDATA[Oxytocin's Modulator Role in Social Interaction and Social Stress]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Florez Acevedo]]></surname>
<given-names><![CDATA[Stefani]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cardenas Parra]]></surname>
<given-names><![CDATA[Luis Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Los Andes  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Los Andes  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<volume>15</volume>
<numero>spe5</numero>
<fpage>1</fpage>
<lpage>15</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S1657-92672016000500018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S1657-92672016000500018&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S1657-92672016000500018&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La Oxitocina es un neuropéptido conocido por facilitar funciones del sistema nervioso periférico, relacionadas específicamente con el sistema reproductivo. Sin embargo, en las últimas décadas se ha reconocido la función moduladora de la Oxitocina en el comportamiento social, a través de su liberación en el sistema nervioso central. Así mismo, estudios han mencionado que la Oxitocina es un potencial ansiolítico cuando un individuo ha sido sometido a estrés social. Por lo tanto, el objetivo de esta revisión es presentar una caracterización de la Oxitocina y su relación con distintas formas de interacción social y el estrés social; a través de los resultados presentados en distintos estudios, tanto en modelos animales como en humanos. Además, se intenta mostrar la importancia de continuar con el estudio de la Oxitocina, dados los posibles vacíos teóricos y experimentales existentes, teniendo en cuenta las potenciales cualidades ansiolíticas de esta hormona.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Oxytocin, a neuropeptide, is known to allow peripheral nervous system functions related specifically to the reproductive system. However, the modulatory function of Oxytocin in social behavior has been recognized in the last decades through its release in the central nervous system. Likewise, some studies have mentioned that Oxytocin is a promising anxiolytic when an individual has been exposed to social stress. Therefore, the objective in this review is to show a characterization of Oxytocin and its relationship with both social interactions and social stress, through results of studies in both animals and humans. Also, this review intends to show the importance of furthering the study of Oxytocin due to the theoretical and experimental voids in its current research, knowing the potential anxiolytic qualities of this hormone.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Oxitocina]]></kwd>
<kwd lng="es"><![CDATA[Interacción social]]></kwd>
<kwd lng="es"><![CDATA[Estrés social]]></kwd>
<kwd lng="es"><![CDATA[Ansiedad]]></kwd>
<kwd lng="en"><![CDATA[Oxytocin]]></kwd>
<kwd lng="en"><![CDATA[Social Interaction]]></kwd>
<kwd lng="en"><![CDATA[Social Stress]]></kwd>
<kwd lng="en"><![CDATA[Anxiety]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="verdana">     <p align="center"><font size="4"><b>Rol Modulador de la Oxitocina en la Interacci&oacute;n Social y el Estr&eacute;s Social<sup>*</sup></b></font></p>     <p align="center"><font size="3"><b>Oxytocin's Modulator Role in Social Interaction and Social Stress</b></font></p>     <p align="center"><b>Stefani Florez Acevedo</b><sup>a    <br> </sup>Universidad de Los Andes, Colombia ORCID: <a href="http://orcid.org/0000-0002-8786-0614">http://orcid.org/0000-0002-8786-0614</a></p>     <p align="center"><b>Luis Fernando Cardenas Parra</b>    <br> Universidad de Los Andes, Colombia</p>     <p>Notas    <br> <sup>*</sup>Art&iacute;culo de revisi&oacute;n. Resultado de investigaci&oacute;n.    <br> <sup>a</sup>Autor de    correspondencia. E-mail: <a target="_blank" href="mailto:stefanipfa@gmail.com">stefanipfa@gmail.com</a></p>     ]]></body>
<body><![CDATA[<p>Recepci&oacute;n: 11 Septiembre 2016 &#124; Aprobaci&oacute;n: 16 Noviembre 2016</p> <hr>     <p align="center"><b>Para citar este art&iacute;culo</b></p>     <p>Florez-Acevedo, S. &amp; C&aacute;rdenas, F. P. (2016). Rol Modulador de la Oxitocina en la Interacci&oacute;n Social y el Estr&eacute;s Social. Universitas Psychologica, 15(5).  <a target="_blank" href="http://dx.doi.org/10.11144/Javeriana.upsy15-5.rmoi">http://dx.doi.org/10.11144/Javeriana.upsy15-5.rmoi</a></p> <hr>     <p><font size="3"><b>Resumen</b></font></p>     <p>La Oxitocina es un neurop&eacute;ptido conocido por facilitar funciones del sistema nervioso perif&eacute;rico, relacionadas espec&iacute;ficamente con el sistema reproductivo. Sin embargo, en las &uacute;ltimas d&eacute;cadas se ha reconocido la funci&oacute;n moduladora de la Oxitocina en el comportamiento social, a trav&eacute;s de su liberaci&oacute;n en el sistema nervioso central. As&iacute; mismo, estudios han mencionado que la Oxitocina es un potencial ansiol&iacute;tico cuando un individuo ha sido sometido a estr&eacute;s social. Por lo tanto, el objetivo de esta revisi&oacute;n es presentar una caracterizaci&oacute;n de la Oxitocina y su relaci&oacute;n con distintas formas de interacci&oacute;n social y el estr&eacute;s social; a trav&eacute;s de los resultados presentados en distintos estudios, tanto en modelos animales como en humanos. Adem&aacute;s, se intenta mostrar la importancia de continuar con el estudio de la Oxitocina, dados los posibles vac&iacute;os te&oacute;ricos y experimentales existentes, teniendo en cuenta las potenciales cualidades ansiol&iacute;ticas de esta hormona.</p>     <p><b>Palabras clave:</b>  Oxitocina; Interacci&oacute;n social; Estr&eacute;s social; Ansiedad</p> <hr>     <p><font size="3"><b>Abstract</b></font></p>     <p>Oxytocin, a neuropeptide, is known to allow peripheral nervous system functions related specifically to the reproductive system. However, the modulatory function of Oxytocin in social behavior has been recognized in the last decades through its release in the central nervous system. Likewise, some studies have mentioned that Oxytocin is a promising anxiolytic when an individual has been exposed to social stress. Therefore, the objective in this review is to show a characterization of Oxytocin and its relationship with both social interactions and social stress, through results of studies in both animals and humans. Also, this review intends to show the importance of furthering the study of Oxytocin due to the theoretical and experimental voids in its current research, knowing the potential anxiolytic qualities of this hormone.</p>     <p><b>Keywords:</b> Oxytocin; Social Interaction; Social Stress; Anxiety</p> <hr>     <p><font size="3"><b>Introducci&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p>La Oxitocina (OT) es una hormona nanop&eacute;ptida formada por nueve amino&aacute;cidos: ciste&iacute;na-tirosina-isoleucina-glutamina-asparagina-ciste&iacute;na-prolina-leucina-glicina con un puente de azufre entre las dos ciste&iacute;nas (Lee, Macbeth, Pagani &amp; Scott, 2009). &Eacute;sta hormona ha sido conocido desde principios del siglo XX por ejerce funciones a nivel perif&eacute;rico: contracciones uterinas y lactancia. Sin embrago, durante las d&eacute;cadas de los 80 y 90 su atractivo investigativo aument&oacute; cuando se evidenci&oacute; que adem&aacute;s de sus efectos perif&eacute;ricos, la OT interven&iacute;a a nivel central (Lee et al., 2009) modulando comportamientos como el materno (Pedersen, Caldwell, Peterson, Walker, &amp; Mason, 1992; Pedersen &amp; Prange, Jr., 1985), el reproductivo (Caldwell, Walker, Pedersen &amp; Mason, 1993) y el de v&iacute;nculos sociales Caldwell et al., 1993; Carter, DeVries, &amp; Getz, 1995). &Eacute;stas &aacute;reas de estudio dieron paso a la gran variedad de investigaci&oacute;n del siglo XXI que actualmente se lleva a cabo sobre el efecto de la OT en distintos tipos de comportamientos sociales como el agresivo (Neumann, 2007; Bosch, Meddle, Beiderbeck, Douglas, &amp; Neumann, 2005; Litvin, Murakami &amp; Pfaff, 2011); el emparejamiento o conformaci&oacute;n de pareja (Schneiderman, Zagoory-Sharon, Leckman &amp; Feldman, 2012; Young, Lim, Gingrich &amp; Insel, 2001); el parental (Lee et al., 2009 ; Strathearn, Iyengar, Fonagy &amp; Kim, 2012; Naber et al., 2010) y el reproductivo (Lee et al., 2009).</p>     <p>Teniendo en cuenta el relevante rol de la OT en las diferentes formas de comportamiento social mencionadas, esta revisi&oacute;n tiene por objetivo presentar una caracterizaci&oacute;n de la OT y su relaci&oacute;n con el comportamiento social y el estr&eacute;s social, a trav&eacute;s de los resultados presentados en distintos estudios, tanto en modelos animales como en humanos. As&iacute; mismo, se presenta la importancia de continuar con el estudio de la OT dados los posibles vac&iacute;os te&oacute;ricos y experimentales existentes, teniendo en cuenta, que este neurop&eacute;ptido podr&iacute;a tener propiedades ansiol&iacute;ticas prometedoras.</p>     <p><font size="3"><b>Revisi&oacute;n de las Propiedades Fisiol&oacute;gicas de la Oxitocina</b></font></p>     <p>El gen de la OT est&aacute; localizado en el cromosoma 2 en ratones y en el cromosoma 20 en humanos (Lee et al., 2009). La OT es secretada por la neurohip&oacute;fisis, la cual es activada por proyecciones desde el hipot&aacute;lamo (Bethlehem, van Honk, Auyeung &amp; Baron-Cohen, 2013) para actuar en el sistema nervioso perif&eacute;rico (SNP) y en el sistema nervioso central (SNC). En el SNP la Oxitocina es metabolizada en el &uacute;tero, la placenta, el amnios, los test&iacute;culos, el p&aacute;ncreas, los ri&ntilde;ones y el coraz&oacute;n (Gimpl &amp; Fahrenholz, 2001). Debido a que la OT liberada en el sistema perif&eacute;rico no puede cruzar la barrera hemato-encef&aacute;lica en altas concentraciones, la posibilidad de cambios comportamentales relevantes es baja (Neumann, 2008), por lo tanto, solo la OT liberada en el SNC originar&aacute; efectos significativos en el comportamiento.</p>     <p>La s&iacute;ntesis de OT en el SNC se produce por la expresi&oacute;n predominante del gen de la OT en neuronas localizadas en los n&uacute;cleos paraventricular (NPV) y supra&oacute;ptico (NSO) del hipot&aacute;lamo (Kiss &amp; Mikkelsen, 2005). La liberaci&oacute;n de la OT se realiza por el NSO a trav&eacute;s de neuronas magnocelulares que se proyectan a la neurohip&oacute;fisis (Bethlehem et al., 2013); mientras que proyecciones axonales de peque&ntilde;as neuronas parvocelulares del NPV inervan a la am&iacute;gdala, el hipocampo, el n&uacute;cleo accumbens y el septo lateral (Ross &amp; Young, 2009).</p>     <p>Similar a los neurotransmisores cl&aacute;sicos como la dopamina, serotonina, GABA o acetilcolina, la OT est&aacute; conservada en ves&iacute;culas que pueden ser liberadas por estimulaci&oacute;n el&eacute;ctrica (Ludwig &amp; Leng, 2006) a la hendidura sin&aacute;ptica; pero a diferencia de los neurotransmisores cl&aacute;sicos, la OT se puede difundir a trav&eacute;s del espacio extracelular (Ross &amp; Young, 2009) debido a su vida media (aproximadamente 20 minutos en el cerebro); lo que implica una degradaci&oacute;n lenta y no presencia de restricciones sin&aacute;pticas espaciales (Ludwig &amp; Leng, 2006). Para evocar la liberaci&oacute;n dendr&iacute;tica de la OT, las neuronas de OT del NPV y del NSO expresan el receptor Melanocortina-4 (MC4) que al unirse con la hormona alfa melanocito estimulante (aMSH) induce la liberaci&oacute;n de Oxitocina de las dendritas de las neuronas magnocelulares (Sabatier, 2006). Espec&iacute;ficamente, la liberaci&oacute;n de OT en el NPV se difunde a otras regiones del cerebro y as&iacute; tiene efectos sobre el comportamiento (Ludwig &amp; Leng, 2006).</p>     <p><font size="3"><b>Receptor de OT y su distribuci&oacute;n en el sistema nervioso</b></font></p>     <p>Hasta la fecha s&oacute;lo un receptor de Oxitocina (OTR) ha sido clonado (Bales &amp; Perkeybile, 2012). Este se caracteriza por tener siete dominios transmembrana (Manning et al., 2012) distribuidos en 3 intrones y 4 exones y est&aacute; localizado en el cromosoma 3 (3p25) (Vrachnis, Malamas, Sifakis, Deligeoroglou, &amp; Iliodromiti, 2011). La distribuci&oacute;n de los OTR se puede dividir en dos grupos: OTR en el sistema nervioso perif&eacute;rico y OTR en el sistema nervioso central. En el sistema nervioso perif&eacute;rico el OTR se encuentra en el &uacute;tero, la placenta, las gl&aacute;ndulas mamarias, el amnios, el coraz&oacute;n, el p&aacute;ncreas y el h&iacute;gado (Gimpl &amp; Fahrenholz, 2001; Kiss &amp; Mikkelsen, 2005). La distribuci&oacute;n de los OTR en el sistema nervioso central ha sido clasificada por diferentes autores, dependiendo de la especie y las estructuras cerebrales. En modelos animales, espec&iacute;ficamente en ratas Yoshimura, Kimura, Watanabe, &amp; Kiyama (1996) clasificaron el OTR en dos grupos: receptores que se expresan de forma transitoria y receptores que se expresan de forma constante y abundante. Los OTR del primer grupo se encuentran distribuidos en el caudado-putamen (CP), corteza cingulada (CC), n&uacute;cleo anterior tal&aacute;mico y el &aacute;rea tegmental ventral (VTA); mientras que los OTR del segundo grupo se encuentran en: el n&uacute;cleo olfatorio anterior, base del n&uacute;cleo de la estr&iacute;a terminal (BNST) y el n&uacute;cleo ventromedial del hipot&aacute;lamo (Yoshimura et al., 1996); sin embargo, Lee et al. (2009) y Veinante &amp; Freund-Mercier (1997) reportaron en sus estudios histoautorradiogr&aacute;ficos, que los OTR se distribu&iacute;an de forma predominante en el n&uacute;cleo de la estr&iacute;a terminal (BST) lateral y supracapsular y la parte medial y central de la am&iacute;gdala. Por su parte, Ostrowski en 1998 plante&oacute; una nueva clasificaci&oacute;n de acuerdo a las regiones implicadas en: los comportamientos reproductivos relacionados a los esteroides, los comportamientos maternos, en los procesos de memoria y aprendizaje y en procesos motivacionales o de refuerzo (Viero et al., 2010). Esta clasificaci&oacute;n indica c&oacute;mo los OTR est&aacute;n ampliamente distribuidos en el sistema l&iacute;mbico, el hipot&aacute;lamo y el tallo cerebral (Ostrowski, 1998).</p>     <p>A diferencia de la identificaci&oacute;n de los OTR en modelos animales, Loup, Tribollet, Dubois-Dauphin, &amp; Dreifuss (1991) utilizaron t&eacute;cnicas autorradiogr&aacute;ficas in vitro con tejidos de la m&eacute;dula espinal y el cerebro de doce humanos para identificar los lugares predominantes de la uni&oacute;n de la Oxitocina, exclusivamente en los humanos. Como resultado encontraron que los n&uacute;cleos basales de Meynert, el n&uacute;cleo de la rama vertical de la banda diagonal de Broca, la parte ventral del n&uacute;cleo septal lateral, el &aacute;rea hipotal&aacute;mica pre&oacute;ptica anterior, el &aacute;rea hipotal&aacute;mica posterior, el globo p&aacute;lido y el p&aacute;lido ventral, hacen parte de regiones donde la OT cumple su papel de ligando, afirmando que ella podr&iacute;a actuar como neurotransmisor o neuromodulador en el sistema nervioso central, tal como lo hab&iacute;an indagado en su estudio anterior (Loup, Tribollet, Dubois-Dauphin, Pizzolato, &amp; Dreifuss, 1989).</p>     <p><font size="3"><b>Farmacolog&iacute;a de la OT: agonistas y antagonistas</b></font></p>     ]]></body>
<body><![CDATA[<p>Los agonistas y antagonistas de OT son mol&eacute;culas que se han desarrollado como herramientas farmacol&oacute;gicas para tratamientos terap&eacute;uticos (Vrachnis et al., 2011) tanto en el sistema nervioso perif&eacute;rico como en sistema nervioso central (Manning et al., 2008). Por medio de la t&eacute;cnica de bioensayos se han identificado cuatro p&eacute;ptidos an&aacute;logos que son m&aacute;s potentes o selectivos que la OT:  (Thr4)OT; HO(Thr4)OT; (Thr4, Gly7)OT y HO(Thr4, Gly7)OT (Manning, Lowbridge, Sawyer, &amp; Haldar, 1976; Lowbridge, Manning, Haldar, &amp; Sawyer, 1977). Dentro de este grupo de agonistas, el  (Thr4, Gly7)OT ha sido el agonista selectivo m&aacute;s utilizado (Manning et al., 2012). Como agonistas no pept&iacute;dicos se encuentran el WAY-267464 desarrollado por Pfizer (Manning et al., 2012), el cual ha demostrado alta afinidad y potencia como agonista selectivo de OTR y ha demostrado efectos ansiol&iacute;ticos similares a la OT (Ring et al., 2010).</p>     <p>Como funci&oacute;n opuesta de los agonistas de OT, los antagonistas han sido sintetizados para retardar el trabajo de parto, tambi&eacute;n conocidos como agentes tocol&iacute;ticos (Vrachnis et al., 2011). Dentro del grupo de los antagonistas pept&iacute;dicos se encuentra el d(D-Tyr(Et)2,Thr4)OVT, conocido comercialmente como Atosiban (Manning et al., 2012) y caracterizado por tener afinidad tambi&eacute;n con los receptores de V1A de vasopresina (AVP) y metabolizarse de forma r&aacute;pida (Viero et al., 2010). Estudios recientes demostraron que este antagonista puede aumentar el &eacute;xito de embarazos de mujeres que han fallado de forma recurrente a fecundaci&oacute;n in vitro como tratamiento de la infertilidad y as&iacute; mismo mejorar el tratamiento de transferencia de embriones (Pierzynski, 2011; Pierzynski, Reinheimer, &amp; Kuczynski, 2007). Al ser utilizado como tocol&iacute;tico, el Atosiban presenta algunas desventajas como por ejemplo (1) una biodisponibilidad limitada, (2) requiere de administraci&oacute;n parenteral (intrad&eacute;mica, subcut&aacute;nea, Intramuscular o intravenosa); (3) baja afinidad a los OTR y (4) al tener afinidad con los receptores de la Vasopresina (espec&iacute;ficamente con el V1A) causa efectos secundarios (Vrachnis et al., 2011).</p>     <p>Teniendo en cuenta la baja afinidad del Atosiban, Manning et al. (2012) compararon varios antagonistas pept&iacute;dicos que tienen alta afinidad con los receptores humanos como por ejemplo el d(CH2)5(Tyr(Me)2)OVT; desGly-NH2,d(CH2)5(Tyr(Me)2, Thr4)OVT; d(CH2)5(Tyr(Me)2, Thr4,Tyr-NH29  )OVT y desGly-NH2,d(CH2)5 (D-Tyr2, Thr4)OVT, y encontraron que el desGly-NH2,d(CH2)5  (D-Tyr2, Thr4)OVT es el antagonista m&aacute;s selectivo. La administraci&oacute;n central de este antagonista selectivo se caracteriza por su efecto como bloqueador de los componentes receptivos y proceptivos del comportamiento sexual en hembras (Pedersen &amp; Boccia, 2002) y por bloquear comportamientos de ansiedad generados por el aumento de la actividad del eje hipotal&aacute;mico-pituitario-adrenal (HPA) tanto en machos como en hembras (Neumann, Wigger, Torner, Holsboer, &amp; Landgraf, 2000). Otro antagonista pept&iacute;dico con alta afinidad en humanos es el Barusiban, el cual se caracteriza por tener mayor afinidad por el receptor OTR que por los receptores para V1A, a diferencia del Atosiban que tiene alta afinidad por los dos tipos de receptores (Reinheimer, 2007); as&iacute; mismo evidencia mayor potencia y duraci&oacute;n que el Atosiban (Vrachnis et al., 2011).</p>     <p><font size="3"><b>El Rol de la Oxitocina en distintos formas de Interacci&oacute;n social</b></font></p>     <p>Estudios en animales no humanos y humanos han demostrado que la OT tiene un rol modulador en una gran variedad de interacciones sociales (Lukas et al., 2011) que han sido relevantes en la evoluci&oacute;n de los mam&iacute;feros como en el reconocimiento social, el comportamiento sexual, el emparejamiento, el comportamiento parental y la agresi&oacute;n.</p>     <p><b>Reconocimiento social</b></p>     <p>El reconocimiento social se define como la capacidad de reconocer un conespec&iacute;fico familiar para el establecimiento de todas las relaciones sociales. Este permite la manifestaci&oacute;n de comportamientos adecuados, ya sean de tipo afiliativo (emparejamiento y/o parental) o de tipo agon&iacute;stico (establecimiento de jerarqu&iacute;as). Estudios con humanos (Domes et al., 2007; Gamer, Zurowski, &amp; Buchel, 2010) y con roedores (Ferguson, Aldag, Insel, &amp; Young, 2001) demostraron que la OT en diferentes n&uacute;cleos de la am&iacute;gdala es necesaria para el reconocimiento social. En roedores se ha demostrado dimorfismo sexual con respecto al rol de la OT, pues se ha evidenciado que el suministro de agonistas de OT facilitan el reconocimiento social en machos y antagonistas interfieren con la habilidad de reconocimiento social en hembras (Bielsky &amp; Young, 2004).</p>     <p><b>Comportamiento Sexual</b></p>     <p>La OT juega un rol fundamental en la regulaci&oacute;n de la conducta sexual tanto en machos como en hembras (Lee et al., 2009). En machos est&aacute; implicada en: el funcionamiento er&eacute;ctil (Melis et al., 2010; Succu et al., 2008; Melis et al., 2007), la actividad copulatoria y la eyaculaci&oacute;n (Gil, Bhatt, Picotte, &amp; Hull, 2011). Es importante aclarar que la OT no act&uacute;a de forma individual, &eacute;sta debe interactuar con otras hormonas como por ejemplo la testosterona, pues si un macho se encuentra castrado a pesar de suministrarle OT no podr&aacute; tener erecciones (Connor &amp; Heithaus, 1996). En hembras la OT facilita: la maduraci&oacute;n sexual (Parent et al., 2008), la manifestaci&oacute;n de comportamientos de atractividad y receptividad, como por ejemplo en el marcado vaginal que realizan hembras de h&aacute;msteres como conducta pre-copulatoria (Martinez, Albers, &amp; Petrulis, 2010) y/o las respuestas de lordosis (Arletti &amp; Bertolini, 1985) y la estimulaci&oacute;n de la secreci&oacute;n de prolactina en ratas (Kennett &amp; McKee, 2012).</p>     <p>En humanos se ha identificado que la OT tanto para hombres como para mujeres es un marcador del orgasmo y en el momento de la c&oacute;pula facilita el transporte de los espermatozoides y el &oacute;vulo por el incremento de la contractibilidad de los m&uacute;sculos correspondientes (Burri, Heinrichs, Schedlowski, &amp; Kruger, 2008). Se ha observado que en mujeres, los niveles de OT en plasma se correlacionan positivamente con la lubricaci&oacute;n genital (Salonia et al., 2005). Con lo anterior se observa el rol de la OT a nivel perif&eacute;rico y central en la conducta sexual en mam&iacute;feros.</p>     ]]></body>
<body><![CDATA[<p><b>Emparejamiento</b></p>     <p>El    emparejamiento se caracteriza por la conformaci&oacute;n de una pareja en favor de la supervivencia, lo que implica no s&oacute;lo la reproducci&oacute;n, sino tambi&eacute;n factores que permitan la prolongaci&oacute;n de la especie, como por ejemplo el cuidado parental, la protecci&oacute;n contra depredadores y la adaptaci&oacute;n a cambios ambientales (Neumann, 2009). Para conocer el rol de la OT en el emparejamiento se han utilizado a roedores mon&oacute;gamos, como los ratones de pradera, y a los campa&ntilde;oles de pino (Young, Gobrogge, Liu, &amp; Wang, 2011; Wang &amp; Aragona, 2004) roedores caracterizados por establecer relaciones no mon&oacute;gamas (Wang &amp; Young, 1997); concluyendo que ratones machos con emparejamiento social mon&oacute;gamo tienden a tener mayor contacto social y preferir a la pareja; mientras que los ratones que no son mon&oacute;gamos permanecen mayor tiempo aislados sin contacto social (Carter &amp; Keverne, 2009). Est&aacute;s diferencias est&aacute;n asociadas a la cantidad de receptores de OT en diferentes &aacute;reas del cerebro. As&iacute;, mientras que los ratones de pradera tienen una densidad alta en la corteza pre-frontal medial (Smeltzer, Curtis, Aragona, &amp; Wang, 2006), en el n&uacute;cleo accumbens (Young et al., 2001) y en la am&iacute;gdala lateral (Insel &amp; Shapiro, 1992); los campa&ntilde;oles de monta&ntilde;a presentan altas densidades en el septum lateral, el n&uacute;cleo olfatorio anterior, el septum lateral y algunos n&uacute;cleo de la am&iacute;gdala (Parker, Phillips, Kinney, &amp; Lee, 2001). Es necesario aclarar que existe dimorfismo sexual en la expresi&oacute;n de OT que a&uacute;n no es claro (de Boer, van Buel &amp; Ter Host, 2012).</p>     <p>Estudios en la conformaci&oacute;n de pareja en humanos sugieren que la OT suministrada intranasal tiene un rol importante en las primeras etapas de la relaci&oacute;n rom&aacute;ntica. En el estudio de Schneiderman et al. (2012) se compararon personas que se encontraban iniciando relaciones rom&aacute;nticas con personas solteras y se observ&oacute; en im&aacute;genes por resonancia magn&eacute;tica funcional (fMRI), un incremento de la actividad del sistema oxitocin&eacute;rgico mayor en enamorados que en solteros. En otro estudio, Hurlemann et al. (2010) demostraron que la OT facilita la confianza interpersonal y la empat&iacute;a considerados factores importantes en la formaci&oacute;n de pareja. Finalmente, en el estudio de Grewen, Girdler, Amico, y Light (2005) tanto para hombres como para mujeres los niveles de OT en plasma se correlacionan con el reporte de apoyo de pareja, entre m&aacute;s alto sientan tener apoyo en su pareja m&aacute;s altos niveles de OT en plasma registraron.</p>     <p><b>Conducta Parental</b></p>     <p>La OT liberada de forma perif&eacute;rica interviene en las contracciones uterinas para el trabajo de parto y en la producci&oacute;n de leche (Neumann, 2008); mientras que la OT liberada en el sistema nervioso central facilita el inicio y mantenimiento de las conductas espec&iacute;ficas del cuidado materno (Lee et al., 2009) en diferentes especies. En roedores cuando se inhibe la liberaci&oacute;n de OT, las conductas relacionadas al comportamiento materno como la construcci&oacute;n del nido, la lactancia, la limpieza de las cr&iacute;as y la defensa se interrumpen (Leng, Meddle, &amp; Douglas, 2008). Estudios con ratas sexualmente ingenuas (Pedersen, Ascher, Monroe, &amp; Prange, Jr., 1982; Pedersen &amp; Prange, Jr., 1979) demostraron que al suministrarles OT manifiestan conductas maternas espec&iacute;ficas similares a las conductas que expresan hembras con cr&iacute;as propias.</p>     <p>Estudios con humanos han demostrado que altos niveles de OT se relacionan con una mejor interacci&oacute;n entre madres-beb&eacute;s, debido a que la OT permite un reconocimiento r&aacute;pido por parte de la madre sobre las emociones, estados de &aacute;nimo y sensaciones f&iacute;sicas del beb&eacute; (Strathearn, Iyengar, Fonagy, &amp; Kim, 2012). En hombres tambi&eacute;n se ha observado rol de la OT en la conducta paterna. Naber et al. (2010) demostraron por primera vez en un estudio experimental que al suministrar OT intranasal a padres, &eacute;stos tienden a tener interacciones m&aacute;s sensibles y menos hostiles con sus hijos durante el juego.</p>     <p>Es importante mencionar que la OT tambi&eacute;n se encuentra relacionada a la agresi&oacute;n materna, conducta que se elicita en el momento en que la madre percibe potencial peligro para sus cr&iacute;as. Varios estudios con distintas especies han demostrado una correlaci&oacute;n positiva entre la liberaci&oacute;n de OT, tanto en el PVN (Bosch et al., 2005) como en el n&uacute;cleo central de la am&iacute;gdala (Ferris et al., 1992), y el comportamiento de agresi&oacute;n evaluado en la prueba de defensa materna, concluyendo que la OT facilita la agresi&oacute;n materna.</p>     <p><b>Agresi&oacute;n</b></p>     <p>El comportamiento agresivo se podr&iacute;a definir como un comportamiento que se manifiesta con la intenci&oacute;n de infligir da&ntilde;o o como respuesta de una amenaza de otro individuo (Trainor, Sisk, &amp; Nelson, 2009). Este comportamiento se presenta en situaciones sociales en las que se establece una jerarqu&iacute;a social dentro de un grupo en funci&oacute;n del alimento, el espacio o la pareja o en situaciones de defensa para sobrevivir ante un contrincante (Lee et al., 2009); por lo que se puede clasificar este comportamiento en: agresi&oacute;n antidepredatoria (Blanchard, Blanchard, Rodgers, &amp; Weiss, 1990), agresi&oacute;n defensiva y ofensiva (Blanchard &amp; Blanchard, 2010), agresi&oacute;n depredatoria (Knutson &amp; Hynan, 1973), agresi&oacute;n dominante (Blanchard, Fukunaga-Stinson, Takahashi, Flannelly, &amp; Blanchard, 1984), agresi&oacute;n maternal (Takahashi &amp; Lore, 1982), agresi&oacute;n relacionada al comportamiento sexual (Motelica-Heino, Edwards, &amp; Roffi, 1993) y en agresi&oacute;n territorial (Thurmond, 1975).</p>     <p>Debido a que el comportamiento agresivo es primitivo y altamente conservado entre las diferentes especies de vertebrados, los mecanismos neurales subyacentes son similares inter-especie (Trainor et al., 2009); por lo que los modelos animales, permiten una comprensi&oacute;n adecuada de los mecanismos que subyacen el comportamiento agresivo en los humanos. Por ejemplo, varios biomodelos han permitido identificar que la regulaci&oacute;n del comportamiento agresivo est&aacute; relacionado con &aacute;reas l&iacute;mbicas (Trainor et al., 2009), principalmente la activaci&oacute;n de la am&iacute;gdala, la cual se relaciona con distintos tipos de encuentros agresivos en distintas especies: ratas (Vochteloo &amp; Koolhaas, 1987; Wang, He, Zhao, &amp; Li, 2013), lagartos (Tarr, 1977), gatos (Zagrodzka &amp; Fonberg, 1978) y primates (DeFrance &amp; Hutchinson, 1972).</p>     ]]></body>
<body><![CDATA[<p>Estudios con roedores han mostrado que la agresi&oacute;n es mediada en parte por la OT. DeVries, Young y Nelson (1997) reportaron que ratones con alteraci&oacute;n de los genes de OT mostraban menor duraci&oacute;n de comportamiento agresivo comparado con ratas tipo salvaje en encuentros agresivos. Engelmann, Ebner, Landgraf, Holsboer y Wotjak (1999) demostraron que al someter a ratas Wistar machos a derrota social, se ocasionaba la liberaci&oacute;n de OT dentro del fluido extracelular del NSQ y en la porci&oacute;n ventrolateral anterior del hipot&aacute;lamo, demostrando que la liberaci&oacute;n de OT es activada por el estr&eacute;s emocional producido por el encuentro agresivo. Neumann (2007) report&oacute; que la exposici&oacute;n a estresores f&iacute;sicos o farmacol&oacute;gicos activan la liberaci&oacute;n de OT en el NPV y en el NSO durante pruebas comportamentales como intruso-residente y nado forzado, y as&iacute; mismo encontr&oacute; que hay liberaci&oacute;n de OT en la am&iacute;gdala central y el septum, sugiriendo que la OT es un neuromodulador prometedor para la intervenci&oacute;n psicoterap&eacute;utica en el tratamiento de enfermedades relacionadas con la ansiedad y la depresi&oacute;n. Bosch et al. (2005) y Ferris et al. (1992) encontraron que si aumentaba el comportamiento agresivo aumentaba la liberaci&oacute;n de OT en el NPV y en la am&iacute;gdala en ratas residentes lactantes cuando se expon&iacute;an a la prueba de defensa maternal; sin embargo el incremento de la conducta agresiva materna era bloqueada por la administraci&oacute;n de antagonistas de OTR; Consiglio, Borsoi, Pereira, y Lucion (2005) reportaron que al suministrar OT en el n&uacute;cleo medio de la am&iacute;gdala de ratas que est&aacute;n lactando, inhib&iacute;a el comportamiento agresivo frente a otras ratas que no est&aacute;n lactando. Finalmente, en el estudio de Litvin et al. (2011) machos Swiss-Webster fueron sometidos a derrota social cr&oacute;nica y a pesar de que no estaban evaluando principalmente los efectos de la OT sino los efectos de la AVI, encontraron que los animales derrotados mostraron mayores niveles de ARNm para OTR en la am&iacute;gdala y en el septum a diferencia de los controles, sugiriendo que la OT modula comportamientos anti y pro sociales.</p>     <p>Los hallazgos presentados sugieren entonces que el rol de la OT en el comportamiento agresivo podr&iacute;a estar relacionado en mayor medida a las respuestas de estr&eacute;s frente a estresores sociales que a la agresi&oacute;n por s&iacute; misma, lo que indica que posiblemente otros factores asociados a la liberaci&oacute;n de OT est&aacute;n relacionados con el encuentro agresivo.</p>     <p><font size="3"><b>Oxitocina y su Relaci&oacute;n con el Estr&eacute;s Social</b></font></p>     <p>Cuando se presenta un desbalance entre los esfuerzos y las recompensas en las distintas formas de interacci&oacute;n social entre individuos, surge una de las fuentes m&aacute;s importantes de estr&eacute;s en la vida de los individuos: el estr&eacute;s social (Tamashiro, Nguyen, &amp; Sakai, 2005). La principal respuesta al estr&eacute;s social es a trav&eacute;s de la relaci&oacute;n del HPA y la liberaci&oacute;n simult&aacute;nea de otras sustancias como la OT. En el estudio de Neumann et al. (2000) para determinar &eacute;sta relaci&oacute;n se suministr&oacute; intracerebroventricularmente un antagonista de OT (des Gly-NH2 d(CH2)  5 (Tyr(Me)2, Thr4) OVT) a un grupo de ratas macho y un grupo de ratas hembra expuestas a pruebas de ansiedad como el laberinto en cruz elevado. Los resultados mostraron que al bloquear los receptores de OT, se afectaba la liberaci&oacute;n basal de ACTH y corticosterona, aumentando los niveles en plasma sangu&iacute;neo, independientemente del g&eacute;nero. Para determinar la localizaci&oacute;n de los efectos de la OT, en el mismo estudio, antagonistas de OTR fueron aplicados en el septum mediolateral, la am&iacute;gdala y el NPV usando microdi&aacute;lisis reversa. Los resultados indicaron que solo hubo un aumento significativo en la actividad del eje HPA cuando la acci&oacute;n de la OT fue bloqueada en el NPV (Neumann, 2002). Como conclusi&oacute;n, la inhibici&oacute;n del eje HPA ocurre en parte por la liberaci&oacute;n de OT en el NPV.</p>     <p>En otro estudio (Gibbs 1985), se utiliz&oacute; inmunoneutralizaci&oacute;n de OT en plasma durante una prueba de suspensi&oacute;n de cola para generar estr&eacute;s, donde se evidenci&oacute; una reducci&oacute;n del 59% en la concentraci&oacute;n de ACTH en ratas, indicando el rol de la OT en la regulaci&oacute;n de la secreci&oacute;n de la ACTH. Finalmente, en el estudio pionero de Windle, Shanks, Lightman y Ingram (1997), se observ&oacute; que la OT al ser suministrada intracerebroventricularmente disminuye significativamente los niveles de corticosterona cuando ratas Sprague-Dawley eran sometidas a ruidos fuertes (114dB). As&iacute; mismo encontr&oacute; que las ratas al ser expuestas a pruebas comportamentales relacionadas a la ansiedad como por ejemplo el laberinto de cruz elevado, la OT ten&iacute;a efectos de tipo ansiol&iacute;tico.</p>     <p>Como conclusi&oacute;n de los anteriores hallazgos, se afirma que la OT act&uacute;a como inhibidor de la liberaci&oacute;n de la hormona de ACTH causando una disminuci&oacute;n en las respuestas del eje HPA y por ende una inhibici&oacute;n de los efectos ansiog&eacute;nicos producidos por la ACTH en diversas situaciones de estr&eacute;s, por lo que podr&iacute;a pensarse a la OT como un modulador sobre la fisiolog&iacute;a del estr&eacute;s. Es decir, la OT podr&iacute;a ejerce un efecto ansiol&iacute;tico ante las respuestas de estr&eacute;s social.</p>     <p><b>Oxitocina: modulador en la fisiolog&iacute;a del estr&eacute;s social</b></p>     <p>La OT es conocida por modular funciones neurales relacionadas principalmente a las respuestas fisiol&oacute;gicas de estr&eacute;s social (Neumann &amp; Landgraf, 2012). En el estudio realizado por Ring et al. (2006), ratones machos fueron expuestos a tres modelos precl&iacute;nicos farmacol&oacute;gicamente validados: laberinto elevado en cero, hipertermia inducida por estr&eacute;s y la prueba de las cuatro placas. Los resultados indicaron que al suministrarles OT las respuestas relacionadas al estr&eacute;s disminu&iacute;an en las tres pruebas, sugiriendo a los agonistas de OTR como un nuevo ansiol&iacute;tico potencialmente &uacute;til terap&eacute;uticamente. Al igual que en ratones, en ratas tambi&eacute;n se han confirmado los efectos ansiol&iacute;ticos de la OT; en el estudio de Slattery y Neumann (2010) se mostr&oacute; que una cepa de ratas Wistar caracterizada por la presencia de comportamientos relacionados con la ansiedad al recibir una infusi&oacute;n cr&oacute;nica de OT intracerebroventricular, disminu&iacute;an sus comportamientos ansiosos al ser sometidas a la caja claro/oscuro. Los resultados sugirieron que el suministro de OT es eficaz para atenuar los rasgos altos de ansiedad en modelos de animales. Por otra parte, en el estudio de Amico, Mantella, Vollmer y Li (2004), se evidenci&oacute; que ratones knock out del gen de OT, al ser sometidos a diferentes pruebas de ansiedad, incluido exposici&oacute;n a ambientes novedosos, mostraron mayores comportamientos asociados a la ansiedad y mayor liberaci&oacute;n de corticosterona comparado con ratones de tipo salvaje.</p>     <p>Las propiedades ansiol&iacute;ticas de la OT est&aacute;n mediadas en parte por su acci&oacute;n en la am&iacute;gdala y en el NPV (Lee et al., 2009; Neumann &amp; Landgraf, 2012). En el modelo propuesto por Viviani y Stoop (2008), se demostr&oacute; que la OT excita neuronas GABAergicas de la am&iacute;gdala central y lateral, que a su vez inhiben a las neuronas que se encargan de aumentar las respuestas comportamentales del miedo, por lo tanto se concluye que la OT modula las respuestas autom&aacute;ticas de miedo (congelamiento en ratas) por sus efectos en la am&iacute;gdala (Knobloch et al., 2012; Huber, Veinante, &amp; Stoop, 2005). De igual forma, algunos estudios han demostrado que la OT en la am&iacute;gdala central no solo modula respuestas de miedo sino tambi&eacute;n comportamientos sociales como el comportamiento agresivo (Bosch et al., 2005; Consiglio et al., 2005). En humanos la OT tambi&eacute;n reduce la activaci&oacute;n de la am&iacute;gdala en respuesta a est&iacute;mulos amenazantes o de riesgo (al igual que en modelos animales) aumentando la sensaci&oacute;n de confianza (Baumgartner, Heinrichs, Vonlanthen, Fischbacher, &amp; Fehr, 2008).</p>     <p>En el estudio de Lukas et al. (2011), se eval&uacute;o la funci&oacute;n pro social de la OT como su efecto en la activaci&oacute;n de la am&iacute;gdala, los resultados indicaron que la OT tiene efectos en la preferencia social y en la disminuci&oacute;n de los efectos comportamentales (evitaci&oacute;n y escape) de un episodio de derrota social, pero no en la activaci&oacute;n de la am&iacute;gdala; concluyendo que la OT podr&iacute;a revertir la evitaci&oacute;n social inducida por el estr&eacute;s y por lo tanto podr&iacute;a ser de uso para el tratamiento de la fobia social y disfunci&oacute;n social en los seres humanos. En el estudio de Litvin et al. (2011) identificaron la expresi&oacute;n de ARNm de OTR en la am&iacute;gdala y el septum lateral de sujetos sometidos a estr&eacute;s social cr&oacute;nico; sin embargo como el objetivo principal de su estudio fue evaluar la funci&oacute;n ansiog&eacute;nica de la AVI, no evaluaron la relaci&oacute;n de la expresi&oacute;n de ARNm de OTR y los posibles efectos ansiol&iacute;ticos de la OT. A pesar de los resultados de estos recientes estudios, a&uacute;n se desconoce los efectos pro sociales de la OT en el estr&eacute;s social cr&oacute;nico, generando un interrogante sobre los posibles efectos ansiol&iacute;ticos de la OT en este tipo de estr&eacute;s.</p>     ]]></body>
<body><![CDATA[<p><font size="3"><b>Conclusi&oacute;n</b></font></p>     <p>En el &uacute;ltimo siglo, la OT ha sido una mol&eacute;cula especialmente estudiada por su relaci&oacute;n directa con el comportamiento social, el estr&eacute;s social y la ansiedad. Las propiedades fisiol&oacute;gicas de la OT han permitido identificar el rol facilitador o inhibidor tanto en el SNP (el cual fue conocido desde inicios del siglo XX) como en el SNC (desde la d&eacute;cadas de los 80's se aument&oacute; el inter&eacute;s investigativo). Dentro de las distintas formas de interacci&oacute;n social en las cuales la OT tiene un efecto modulador como facilitador se encuentran el reconocimiento social, la conducta sexual, el emparejamiento y la conducta parental en distintas especies de animales, incluido el humano. Sin embargo, frente a la agresi&oacute;n (comportamiento agon&iacute;stico), los efectos moduladores de la OT est&aacute;n dirigidos no al comportamiento agresivo perse, sino a las respuestas de estr&eacute;s que se presentan en un encuentro agon&iacute;stico; lo que conlleva a aumentar el inter&eacute;s investigativo de los efectos del estr&eacute;s social en la liberaci&oacute;n o inhibici&oacute;n de esta hormona nanop&eacute;ptida.</p>     <p>Distintos estudios presentados en esta revisi&oacute;n, reconocieron a la OT como un potencial inhibidor de las respuestas del eje HPA, a trav&eacute;s de la inhibici&oacute;n de la liberaci&oacute;n de la hormona ACTH, en algunos escenarios de estr&eacute;s: agudo y epis&oacute;dico. Concluyendo que la OT podr&iacute;a utilizarse como un ansiol&iacute;tico prometedor. Sin embargo, a&uacute;n no es claro cu&aacute;les son los efectos del estr&eacute;s social cr&oacute;nico en la liberaci&oacute;n de la OT. Por lo tanto, se recomienda llevar a cabo estudios que permitan identificar c&oacute;mo la OT podr&iacute;a funcionar como un modulador efectivo en el tratamiento de distintos tipos de trastornos asociados a la ansiedad (inducida por el estr&eacute;s social cr&oacute;nico), como por ejemplo la fobia social y la disfunci&oacute;n social en humanos; pues como lo menciona la Sociedad Americana de Psicolog&iacute;a (APA), solo en Estados Unidos, al menos 19 millones de adultos padecen este tipo de trastorno.</p> <hr>     <p><font size="3"><b>Referencias</b></font></p>     <!-- ref --><p>Amico, J. A., Mantella, R. C., Vollmer, R. R., &amp; Li, X. (2004). Anxiety and stress responses in female oxytocin deficient mice. J.Neuroendocrinol.,  16 (4), 319-324. 10.1111/j.0953-8194.2004.01161.x (doi)JNE1161 (pii)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6031556&pid=S1657-9267201600050001800001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>Arletti, R. &amp; Bertolini, A. (1985). Oxytocin stimulates lordosis behavior in female rats. Neuropeptides, 6 (3), 247-253.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6031557&pid=S1657-9267201600050001800002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     <!-- ref --><p>Bales, K. L. &amp; Perkeybile, A. M. (2012). Developmental experiences and the oxytocin receptor system. Horm.Behav.,  61 (3), 313-319. S0018-506X(11)00290-X (pii);10.1016/j.yhbeh.2011.12.013 (doi)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6031559&pid=S1657-9267201600050001800003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>Baumgartner, T., Heinrichs, M., Vonlanthen, A., Fischbacher, U., &amp; Fehr, E. (2008). Oxytocin Shapes the Neural Circuitry of Trust and Trust Adaptation in Humans. Neuron, 58 (4), 639-650.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=6031560&pid=S1657-9267201600050001800004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></p>     ]]></body>
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