<?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>0185-4534</journal-id>
<journal-title><![CDATA[Revista mexicana de análisis de la conducta]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. anál. conducta]]></abbrev-journal-title>
<issn>0185-4534</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Análisis de la Conducta]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-45342010000200003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Administración del 8-OH-DPAT en el núcleo ventromedial hipotalámico: caracterización de la conducta alimentaria]]></article-title>
<article-title xml:lang="en"><![CDATA[Administration of 8-OH-DPAT in the ventromedial hypothalamic nucleus: characterization of feeding behavior]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Alonso]]></surname>
<given-names><![CDATA[Verónica Elsa]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mancilla Díaz]]></surname>
<given-names><![CDATA[Juan Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rito Domingo]]></surname>
<given-names><![CDATA[Melissa]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez Fujarte]]></surname>
<given-names><![CDATA[Armando Giovanni]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz Urbina]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala Laboratorio de Psicobiología de la Alimentación]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A01">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala Laboratorio de Psicobiología de la Alimentación]]></institution>
<addr-line><![CDATA[Tlalnepantla Edo. de México]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2010</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2010</year>
</pub-date>
<volume>36</volume>
<numero>2</numero>
<fpage>21</fpage>
<lpage>37</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-45342010000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-45342010000200003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-45342010000200003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La presente investigación evaluó los efectos del agonista de los receptores 5-HT1A 8-OH-DPAT sobre la Secuencia de Saciedad Conductual (SSC) en ratas. El 8-OH-DPAT fue administrado vía central en el núcleo ventromedial hipotalámico (NVH) de ratas. Los sujetos experimentales fueron mantenidos bajo un paradigma de auto-selección dietaría consistente en proteínas, carbohidratos y grasas. El alimento y el agua estuvieron disponibles todo el tiempo. La administración intra-NVH del agonista 5-HT1A fue asociada al incremento selectivo de la ingesta de carbohidratos. El análisis de la SSC reveló que la administración del 8-OH-DPAT demoró el desarrollo natural de la SSC. Los resultados llevan a concluir que los receptores 5-HT1A del NVH participan en la modulación de la ingesta de alimento, se discute la posible participación de la interacción con otros sistemas de neurotransmisores.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The present study evaluated the effects of 5-HT1A receptor agonist 8-OH-DPAT on the Behavioral Satiety Sequence (BSS) in rats. The 8-OH-DPAT was administered via central in the hypothalamic ventromedial nucleus (VMN) in rats. The experimental subjects were kept under a dietary self-selection paradigm consisting of proteins, carbohydrates and fats. Food and water were available all the time. Intra-VMN administration of 5-HT1A agonist was associated with the selective increase in carbohydrate intake. The BSS analysis revealed that the administration of 8-OH-DPAT delayed the natural development of the BSS. The results lead to the conclusion that 5-HT1A receptors in the NVH involved in the modulation of food intake, is discussed the possible involvement of interactions with other neurotransmitters systems.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[agonista 5-HT1A]]></kwd>
<kwd lng="es"><![CDATA[ingesta de alimento]]></kwd>
<kwd lng="es"><![CDATA[secuencia de saciedad conductual]]></kwd>
<kwd lng="en"><![CDATA[5-HT1A agonist]]></kwd>
<kwd lng="en"><![CDATA[food intake]]></kwd>
<kwd lng="en"><![CDATA[behavioral satiety sequence]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culos de investigaci&oacute;n emp&iacute;rica</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Administraci&oacute;n del 8&#150;OH&#150;DPAT en el n&uacute;cleo ventromedial hipotal&aacute;mico: caracterizaci&oacute;n de la conducta alimentaria</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Administration of 8&#150;OH&#150;DPAT in the ventromedial hypothalamic nucleus: characterization of feeding behavior</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Ver&oacute;nica Elsa L&oacute;pez Alonso, Juan Manuel Mancilla D&iacute;az, Melissa Rito Domingo, Armando Giovanni Jim&eacute;nez Fujarte, Daniel D&iacute;az Urbina</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>Laboratorio de Psicobiolog&iacute;a de la Alimentaci&oacute;n, FES Iztacala, Universidad Nacional Aut&oacute;noma de M&eacute;xico.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Correspondencia:</b>     <br>   <i>Juan Manuel Mancilla&#150;D&iacute;az,</i>     <br> <i>Laboratorio de Psicobiolog&iacute;a de la Alimentaci&oacute;n,     <br> UNAM FES&#150;Iztacala. Av de los Barrios #1,     <br> Los Reyes Iztacala, Tlalnepantla Edo. de M&eacute;xico.     <br> CP. 54090. Tel. + 52(55) 56231298,     <br> ext. 410, 409 y 457. Fax: +52(55) 5390 7604.</i>     <br> E&#150;mail: <a href="mailto:jmmd@servidor.unam.mx">jmmd@servidor.unam.mx</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido: Abril 21, 2010    ]]></body>
<body><![CDATA[<br> Revisado: Junio 2, 2010    <br> Aceptado: Junio 22, 2010</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">La presente investigaci&oacute;n evalu&oacute; los efectos del agonista de los receptores 5&#150;HT<Sub>1A </Sub>8&#150;OH&#150;DPAT sobre la Secuencia de Saciedad Conductual (SSC) en ratas. El 8&#150;OH&#150;DPAT fue administrado v&iacute;a central en el n&uacute;cleo ventromedial hipotal&aacute;mico (NVH) de ratas. Los sujetos experimentales fueron mantenidos bajo un paradigma de auto&#150;selecci&oacute;n dietar&iacute;a consistente en prote&iacute;nas, carbohidratos y grasas. El alimento y el agua estuvieron disponibles todo el tiempo. La administraci&oacute;n intra&#150;NVH del agonista 5&#150;HT<Sub>1A </Sub>fue asociada al incremento selectivo de la ingesta de carbohidratos. El an&aacute;lisis de la SSC revel&oacute; que la administraci&oacute;n del 8&#150;OH&#150;DPAT demor&oacute; el desarrollo natural de la SSC. Los resultados llevan a concluir que los receptores 5&#150;HT<Sub>1A</Sub> del NVH participan en la modulaci&oacute;n de la ingesta de alimento, se discute la posible participaci&oacute;n de la interacci&oacute;n con otros sistemas de neurotransmisores.</font></p>     <p align="justify"><font face="verdana" size="2"><B>Palabras clave:</B> agonista 5&#150;HT<Sub>1A</Sub>, ingesta de alimento, secuencia de saciedad conductual.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>     <p align="justify"><font face="verdana" size="2">The present study evaluated the effects of 5&#150;HT<Sub>1A</Sub> receptor agonist 8&#150;OH&#150;DPAT on the Behavioral Satiety Sequence (BSS) in rats. The 8&#150;OH&#150;DPAT was administered via central in the hypothalamic ventromedial nucleus (VMN) in rats. The experimental subjects were kept under a dietary self&#150;selection paradigm consisting of proteins, carbohydrates and fats. Food and water were available all the time. Intra&#150;VMN administration of 5&#150;HT<Sub>1A</Sub> agonist was associated with the selective increase in carbohydrate intake. The BSS analysis revealed that the administration of 8&#150;OH&#150;DPAT delayed the natural development of the BSS. The results lead to the conclusion that 5&#150;HT<Sub>1A</Sub> receptors in the NVH involved in the modulation of food intake, is discussed the possible involvement of interactions with other neurotransmitters systems.</font></p>     <p align="justify"><font face="verdana" size="2"><B>Keywords:</B> 5&#150;HT<Sub>1A</Sub> agonist, food intake, behavioral satiety sequence.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Las evidencias respecto a la participaci&oacute;n de la serotonina (5&#150;HT) sobre el control de la ingesta de alimento y peso corporal son amplias (Blundell 1984; Leibowitz, Alexander, Cheung &amp; Weiss, 1993; Leibowitz &amp; Alexander, 1998). Esta amina biog&eacute;nica es considerada como un mediador importante de la saciedad. En la literatura est&aacute; establecido que el aumento de la actividad del sistema serotonin&eacute;rgico al ser estimulado perif&eacute;rica o centralmente promueve la saciedad (Clifton, Barnfield &amp; Philcox, 1989; Fletcher &amp; Paterson, 1989; Halford &amp; Blundell, 1996; Hewitt, Lee, Dourish &amp; Clifton, 2002; Kitchner &amp; Dourish, 1994; Leibowitz &amp; Alexander, 1998; Leibowitz, Weiss &amp; Suh, 1990; Weiss, et al., 1991). La utilizaci&oacute;n de f&aacute;rmacos que reducen la actividad serotonin&eacute;rgica o que bloquean la disponibilidad de 5&#150;HT (antagonistas de los receptores 5&#150;HT o inhibidores de la liberaci&oacute;n de 5&#150;HT), han sido implicados en la inducci&oacute;n del efecto hiperf&aacute;gico. Mientras que los agentes farmacol&oacute;gicos que facilitan la liberaci&oacute;n de 5&#150;HT (agonistas 5&#150;HT, inhibidores de recaptura y f&aacute;rmacos que incrementan la liberaci&oacute;n de 5&#150;HT) causan hipofagia (Blundell 1984; Garattini, Mennini, Bendotti, Invernizzi &amp; Samanin, 1986; Mancilla, Escart&iacute;n, L&oacute;pez &amp; Camacho, 2006). Particularmente la estimulaci&oacute;n de los subtipos de receptores 5&#150;HT<Sub>1B</Sub>, 5&#150;HT<Sub>2A </Sub>y 5&#150;HT<Sub>2C </Sub>se han relacionado con la mediaci&oacute;n de la respuesta hipof&aacute;gica entretanto que el subtipo 5&#150;HT<Sub>1A</Sub> se ha vinculado con la hiperfagia (Currie, Coscina &amp; Fletcher, 1998; Jhanwar&#150;Uniyal, Moorjani &amp; Kahn 1994; Schreiber &amp; De Vry, 2002; Schreiber, Selbach, Asmussen, Hesse &amp; De Vry, 2000). </font></p>     <p align="justify"><font face="verdana" size="2">La  microinyecci&oacute;n de 5&#150;HT en el hipot&aacute;lamo medial produce cambios selectivos sobre los patrones temporales de la conducta alimentaria y selecci&oacute;n dietar&iacute;a; reduciendo selectivamente la ingesti&oacute;n de carbohidratos. Estos efectos se han observado en diferentes n&uacute;cleos del hipot&aacute;lamo medial incluyendo al n&uacute;cleo ventromedial del hipot&aacute;lamo (NVH) (Leibowitz &amp; Alexander 1998; Leibowitz, et al., 1990). El NVH es una regi&oacute;n importante para la regulaci&oacute;n de la ingesta de alimento, secreci&oacute;n de hormonas y homeostasis metab&oacute;lica. La destrucci&oacute;n del NVH y &aacute;reas adyacentes produce hiperinsulinemia, hiperfagia, metabolismo de l&iacute;pidos anormal y obesidad (Stenger, Fournier &amp; Bielajew, 1991). A trav&eacute;s de la historia el NVH se ha venido implicado con el control de la saciedad. El trabajo pionero de Hetherington y Ranson (1942) demostr&oacute; que la lesi&oacute;n del NVH causa sobrealimentaci&oacute;n y una ganancia excesiva de peso. En tanto que, Kennedy (1950) fue el primero en proponer que el NVH era el centro cerebral de la saciedad. Por otra parte Mayer (1955) hipotetiz&oacute; que el NVH era el lugar donde se localizaban los glucoreceptores responsables de iniciar la saciedad (teor&iacute;a glucost&aacute;tica de la alimentaci&oacute;n). Actualmente se tiene conocimiento de que la tasa de disparo de algunas neuronas dentro del NVH es influenciado por la disponibilidad de glucosa y afecta la actividad del sistema nervioso simp&aacute;tico (Lee, et al., 2007).</font></p>     <p align="justify"><font face="verdana" size="2">Adicionalmente, tambi&eacute;n se sabe de la presencia de los subtipos de receptores 5&#150;HT<Sub>1B</Sub> y 5&#150;HT<Sub>2C</Sub> en el NVH (Nishimura, Nishihara, Torii &amp; Takahashi, 1996; Park, Harrold, Widdowson &amp; Williams, 1999). Investigaciones como la de Hijiki, Inoue, Iwasaki, Ichihara y Kiriike, (2004) muestran que la infusi&oacute;n de m&#150;CPP (agonista de los receptores 5&#150;HT<Sub>1B/2C</Sub>) directamente en el NVH reduce la ingesta de alimento v&iacute;a receptores 5&#150;HT<Sub>1B</Sub> y 5&#150;HT<Sub>2C</Sub>. Utilizando t&eacute;cnicas de <I>binding</I> se ha evidenciado la presencia del  receptor subtipo 5&#150;HT<Sub>1A</Sub> en el NVH en alta densidad (Li, Battaglia &amp; Van de Kar, 1997; Li, Muma, Battaglia &amp; Van de Kar, 1997). La funci&oacute;n de este receptor con respecto a la ingesta de alimento es controversial, los reportes de investigaci&oacute;n sugieren un efecto bif&aacute;sico sobre la ingesta de alimento (De Vry &amp; Schreiber, 2000). Algunas investigaciones han reportado el incremento de la ingesta de alimento al administrar el agonista selectivo 5&#150;HT<Sub>1A</Sub> 8&#150;OH&#150;DPAT (Dourish, Hutson, &amp; Curzon, 1985; Dourish, Hutson, Kennett &amp; Curzon, 1986; Hutson, Dourish &amp; Curzon, 1988). Empleando la metodolog&iacute;a de auto&#150;selecci&oacute;n dietar&iacute;a se sugiere que el efecto hiperf&aacute;gico es espec&iacute;fico sobre la ingesti&oacute;n de carbohidratos (Luo, Ransom &amp; Li, 1990). Tambi&eacute;n se ha reportado que el 8&#150;OH&#150;DPAT es capaz de bloquear el efecto hipof&aacute;gico inducido por  f&aacute;rmacos como la colecistoquinina, la fenfluramina y la fluoxetina (Currie, et al., 1998; Currie, Braver, Mirza &amp; Sricharoon, 2004; Poeschla, Gibbs, Simansky &amp; Smith, 1992). Contrariamente, algunas investigaciones sugieren que la administraci&oacute;n perif&eacute;rica del 8&#150;OH&#150;DPAT reduce la ingesta de alimento (Simansky &amp; Vaidya, 1990) y la administraci&oacute;n central en el n&uacute;cleo paraventricular hipotal&aacute;mico y en el raf&eacute; medio tambi&eacute;n disminuyen la ingesta de alimento al inicio del ciclo de oscuridad (L&oacute;pez, Mancilla, Rito, Gonz&aacute;lez &amp; Escart&iacute;n, 2007; Wirtshafter, 2001). </font></p>     <p align="justify"><font face="verdana" size="2">En t&eacute;rminos generales se ha dicho que la hipofagia inducida por la administraci&oacute;n de f&aacute;rmacos serotonin&eacute;rgicos se debe a la aceleraci&oacute;n del proceso de saciedad. Algunos investigadores han sugerido que los f&aacute;rmacos que liberan la 5&#150;HT y los que estimulan los receptores 5&#150;HT<Sub>2C</Sub> y/o 5&#150;HT<Sub>1B</Sub> espec&iacute;ficamente incrementan la saciedad en ratas (Clifton, Barnfield &amp; Curzon, 1993; Halford, Wanninayake &amp; Blundell, 1998; Kitchner &amp; Dourish, 1994; Samanin &amp; Grignashi, 1996; Simansky &amp; Vaidya, 1990). Para determinar s&iacute; la hipofagia inducida por un f&aacute;rmaco se debe al desarrollo de la saciedad o a reacciones colaterales adversas como nausea, sedaci&oacute;n, hiperactividad y/o paladeabilidad del alimento, la utilizaci&oacute;n del an&aacute;lisis de Secuencia de Saciedad Conductual &#91;SSC&#93; suele ser una buena alternativa (L&oacute;pez, Mancilla &amp; Escart&iacute;n, 2002). Se ha observado que justo en el momento en que finaliza la ingesti&oacute;n de alimento se inicia el desarrollo de un patr&oacute;n conductual altamente estereotipado (Gao, Harvey, Mook &amp; Zeigler, 1998). Despu&eacute;s de que cesa la ingesta de alimento, el animal se acicala o explora el interior de su caja&#150;habitaci&oacute;n y la secuencia t&iacute;picamente finaliza con el animal en una postura de descanso. Halford et al. (1998) denominan a esta secuencia como SSC y la definen como la transici&oacute;n ordenada de comer, actividad, acicalamiento y descanso medidos durante el per&iacute;odo de post&#150;ingesta. De tal forma que la SSC parece estar fuertemente relacionada con el proceso de satisfacci&oacute;n (terminaci&oacute;n del intervalo de alimentaci&oacute;n) y el desarrollo de la saciedad (inhibici&oacute;n postingesta de alimento).</font></p>     <p align="justify"><font face="verdana" size="2">Se ha argumentado que el efecto sobre la ingesta de alimento del 8&#150;OH&#150;DPAT posiblemente sea dependiente de la metodolog&iacute;a utilizada, dosis, periodos y tiempo de observaci&oacute;n. Pero se desconocen los mecanismos de acci&oacute;n a trav&eacute;s de los cuales se produce la respuesta hipof&aacute;gica o hiperfagica. Por lo que es necesario continuar investigando para establecer los mecanismos involucrados para inducir uno u otro efecto. Dado lo anterior, el objetivo general de la presente investigaci&oacute;n fue determinar el papel de la estimulaci&oacute;n del subtipo de receptor 5&#150;HT<Sub>1A</Sub> del n&uacute;cleo ventromedial hipotal&aacute;mico (NVH) sobre la ingesta de alimento y secuencia de saciedad conductual.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>M&eacute;todo</b></font></p>     <p align="justify"><font face="verdana" size="2"><I>Sujetos</I></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se utilizaron 20 ratas macho de la cepa Wistar de 200&#150;230 g al inicio del experimento. Los animales fueron provistos por el Bioterio de la FES&#150;Iztacala, UNAM. Todos los procedimientos del presente estudio fueron realizados de acuerdo a la Norma Oficial Mexicana (NOM&#150;062&#150;ZOO&#150;1999), Especificaciones T&eacute;cnicas para la Producci&oacute;n, Cuidado y Uso de Animales de Laboratorio.</font></p>     <p align="justify"><font face="verdana" size="2"><I>Dietas</I></font></p>     <p align="justify"><font face="verdana" size="2">Hidratos de carbono (harina de ma&iacute;z Maseca, ma&iacute;z nixtamalizado, Molinos Azteca de Chalco S.A. de C.V., planta Teotihuacan), prote&iacute;nas (prote&iacute;na aislada de soya 91.5% marca Supro 500 E, distribuido por Protein Technologies International, S.A. of C.V. Checkerboard Square, St. Louis, MO), grasas (manteca vegetal Inca. Elaborado por Anderson Clayton &amp; Co. S.A. de C.V., Tultitl&aacute;n, Estado de M&eacute;xico). El agua fue enriquecida con Vitater, un suplemento vitam&iacute;nico (hecho en M&eacute;xico por Laboratorio Maver).</font></p>     <p align="justify"><font face="verdana" size="2"><I>F&aacute;rmacos</I></font></p>     <p align="justify"><font face="verdana" size="2">Los f&aacute;rmacos utilizados fueron: 2,5&#150;Dimetoxi&#150;4&#150;iodoamphetamina (DOI agonista 5&#150;HT<Sub>2A, </Sub>tambi&eacute;n activa receptores 5&#150;HT<Sub>2C</Sub>, 7.2 &mu;g/0.5&mu;l); 8&#150;hidroxi&#150;2&#150;(di&#150;n&#150;propilamino)tetralina (8&#150;OH&#150;DPAT agonista selectivo 5&#150;HT<Sub>1A</Sub>,<Sub> </Sub>0.5 &mu;g/0.5&mu;l). Este f&aacute;rmaco fue adquirido con Sigma Chemical Co., St. Louis, MO. Todos los f&aacute;rmacos fueron infundidos a una velocidad de 1&mu;l/3min en el n&uacute;cleo ventromedial hipotal&aacute;mico (NVH). Para asegurar una difusi&oacute;n completa de las sustancias el microinyector permaneci&oacute; un minuto adicional dentro de la c&aacute;nula gu&iacute;a, luego fue retirado. La administraci&oacute;n de los f&aacute;rmacos se realiz&oacute; con una jeringa digital para fluidos de alta precisi&oacute;n (Hamilton Co., Reno, NV). </font></p>     <p align="justify"><font face="verdana" size="2"><I>Cirug&iacute;a estereot&aacute;xica</I></font></p>     <p align="justify"><font face="verdana" size="2">Los animales fueron anestesiados con hidrato de cloral (350mg/kg). Una vez anestesiados, se fijaron a un estereot&aacute;xico y se les implant&oacute; una c&aacute;nula 2 mm por arriba del NVH del lado derecho. Las coordenadas sugeridas se tomaron del Atlas Estereot&aacute;xico de Paxinos y Watson (1986). Las coordenadas fueron corregidas previamente por ensayo y error en un grupo piloto, inyectando azul de metileno a trav&eacute;s de la c&aacute;nula gu&iacute;a hasta te&ntilde;ir el NVH. Posterior a la correcci&oacute;n, las coordenadas fueron las siguientes: posterior a bregma &#150;2.30 mm; lateral a la l&iacute;nea media 0.6 mm y de profundidad a partir de dura madre &#150;8.0 mm. Finalmente se aplicaron 50.000 u/kg, im de penicilina benzat&iacute;nica para prevenir infecciones.</font></p>     <p align="justify"><font face="verdana" size="2"><I>Procedimiento</I></font></p>     <p align="justify"><font face="verdana" size="2">Se colocaron a las ratas de manera aleatoria en cajas habitaci&oacute;n, individuales, cada una de ellas con tres comederos y mantenidas en un ciclo invertido de luz&#150;oscuridad de 12x12 hr con libre acceso a agua y comida. Los animales se pesaron a las 8:00 hr, una hora antes de iniciar el ciclo de oscuridad (9:00 hr). Las ratas tuvieron acceso a una dieta de fuentes separadas para carbohidratos, prote&iacute;nas y grasas. Cada nutrimento se cambi&oacute; de lugar de acuerdo a un orden preestablecido, para evitar "preferencia de lugar". El tiempo bajo estas condiciones fue de una semana.</font></p>     <p align="justify"><font face="verdana" size="2">Despu&eacute;s de lo anterior, los animales fueron sometidos a cirug&iacute;a estereot&aacute;xica. Cuatro d&iacute;as posteriores a la cirug&iacute;a (per&iacute;odo de recuperaci&oacute;n), los animales fueron asignados aleatoriamente a un grupo de diez animales cada uno (control &oacute; 8&#150;OH&#150;DPAT). Las ratas fueron inyectadas dentro de NVH con salina seguida por salina (control) &oacute; salina seguida de 8&#150;OH&#150;DPAT (8&#150;OH&#150;DPAT). A todos los animales se les administraron dos inyecciones dentro del NVH, el tiempo entre una y otra administraci&oacute;n fue de diez minutos. Una vez iniciado el per&iacute;odo de oscuridad se realiz&oacute; un registro de duraci&oacute;n continua de 60 min, al finalizar el registro se pesaron y rellenaron los comederos (cuidando de recolectar lo que cayera del comedero) para determinar el consumo de alimento.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Todas las sesiones se filmaron a trav&eacute;s de una c&aacute;mara de circuito cerrado para bajas intensidades de luz, para realizar el registro de duraci&oacute;n continua. Esto se realiz&oacute; desde un cuarto contiguo para no interferir la conducta de los sujetos experimentales.</font></p>     <p align="justify"><font face="verdana" size="2"><I>Medidas conductuales</I></font></p>     <p align="justify"><font face="verdana" size="2">Para realizar el an&aacute;lisis de la secuencia de saciedad conductual (SSC), los 60 minutos de registro continuo fueron divididos en 12 segmentos de 5 minutos cada uno y se analizaron considerando las siguientes categor&iacute;as conductuales: ingesta (definida como el tiempo en segundos que dedican las ratas para alimentarse), descanso (tiempo en segundos en el que las ratas permanecen inactivas con cabeza en el piso), otras conductas (tiempo en segundos que dedican para, desplazarse, husmear, levantarse sobre las patas traseras etc. dentro de la caja&#150;habitaci&oacute;n) y acicalarse (tiempo en segundos que pasan lavando y limpiando cualquier parte de su cuerpo).</font></p>     <p align="justify"><font face="verdana" size="2"><I>Determinaci&oacute;n de glucosa en suero</I></font></p>     <p align="justify"><font face="verdana" size="2">Al finalizar el periodo de observaci&oacute;n (1h) los sujetos fueron decapitados. Se recolect&oacute; 1.5 ml de sangre del tronco en tubos de vidrio de 10 ml, se dej&oacute; coagular la sangre por un lapso de 15&#150;20 min a temperatura ambiente. Cuando se observ&oacute; la retracci&oacute;n del coagulo se centrifug&oacute; el tubo por un periodo de 10 min a 3500 r.p.m. Posteriormente se separ&oacute; el suero sobrenadante empleando una micropipeta. El suero fue usado para determinar la concentraci&oacute;n de glucosa  basado en la reacci&oacute;n de la glucosa oxidasa / peroxidasa (GOD&#150;POD). El <I>kit</I> comercial glucosa por <I>trinder</I> GOD&#150;POD fue adquirido con Spinreact&#150;Lab Center de M&eacute;xico S.A de C.V.</font></p>     <p align="justify"><font face="verdana" size="2"><I>Histolog&iacute;a</I></font></p>     <p align="justify"><font face="verdana" size="2">El cerebro fue removido y se mantuvo 7 d&iacute;as en formol al 10.0 %. Posteriormente se realizaron cortes histol&oacute;gicos coronales de 70 &#956;m de espesor con un vibratomo, para luego te&ntilde;irlos con la t&eacute;cnica de Nissl y poder as&iacute; verificar el sitio de implantaci&oacute;n de la c&aacute;nula.</font></p>     <p align="justify"><font face="verdana" size="2">(An&aacute;lisis de resultados)</font></p>     <p align="justify"><font face="verdana" size="2">Posterior a la verificaci&oacute;n del sitio de implantaci&oacute;n (<a href="#f1">Figura 1</a>), los grupos quedaron conformados de la manera siguiente: grupo Control (n=7) y grupo 8&#150;OH&#150;DPAT (n=8).</font></p>     <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><img src="/img/revistas/rmac/v36n2/a3f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">Los resultados se expresan en t&eacute;rminos de la media &plusmn; Error Est&aacute;ndar de la Media (EEM). Cada unidad de an&aacute;lisis (ingesti&oacute;n de prote&iacute;nas, carbohidratos y grasas, niveles de glucosa), se analiz&oacute; empleando una Prueba <I>t</I> no relacionada. El criterio estad&iacute;stico para significancia fue <I>p</I> &lt; .05. El procesamiento estad&iacute;stico se llev&oacute; a cabo con el paquete denominado SPSS (versi&oacute;n 13.0 para Windows).</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resultados</b></font></p>     <p align="justify"><font face="verdana" size="2"><I>Ingesti&oacute;n</I></font></p>     <p align="justify"><font face="verdana" size="2">El an&aacute;lisis revel&oacute; que el grupo al que se le administr&oacute; el 8&#150;OH&#150;DPAT increment&oacute; significativamente la ingesta de carbohidratos (<I>X</I>&#773; = 2.15, <I>EEM </I>= 0.30) comparado con el grupo control (<i>X</i>&#773; = 0.98, <I>EEM</I> = 0.33, <I>t </I>(13) = &#150;2.6; p&lt; 0.05) (<a href="#f2">Figura 2</a>). En la ingesti&oacute;n de prote&iacute;nas y grasas no se encontraron efectos significativos debidos a la administraci&oacute;n intrahipotal&aacute;mica del 8&#150;OH&#150;DPAT.</font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/rmac/v36n2/a3f2.jpg"></font></p>     <p align="justify"><font face="verdana" size="2"><I>Concentraci&oacute;n de glucosa en suero</I></font></p>     <p align="justify"><font face="verdana" size="2">El an&aacute;lisis de la concentraci&oacute;n de glucosa no mostr&oacute; diferencias estad&iacute;sticas significativas entre el grupo control y el grupo 8&#150;OH&#150;DPAT, una hora despu&eacute;s de haber administrado el agonista. Sin embargo en la <a href="#f3">figura 3</a> se puede observar la tendencia a reducir el nivel de glucosa en el grupo al que se le administr&oacute; el 8&#150;OH&#150;DPAT.</font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><a name="f3"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/rmac/v36n2/a3f3.jpg"></font></p>     <p align="justify"><font face="verdana" size="2"><I>Secuencia de Saciedad Conductual</I></font></p>     <p align="justify"><font face="verdana" size="2">El grupo control muestra un desarrollo ordenado de la SSC, es decir conducta de ingesta (ver <a href="#f4">figura 4A</a>), seguida de la presencia de otras conductas, acicalarse y posteriormente el descanso. La transici&oacute;n entre la conducta de alimentarse y el descanso para este grupo se observ&oacute; entre los per&iacute;odos 5 y 6. La administraci&oacute;n del agonista 5&#150;HT<Sub>1A</Sub> 8&#150;OH&#150;DPAT demor&oacute; el desarrollo de la SSC (ver <a href="#f4">figura 4B</a>). En cuanto a la transici&oacute;n de la conducta de alimentarse y de descanso se observ&oacute; un desplazamiento a la derecha (per&iacute;odo 10), al compararse con el grupo control. El desarrollo de la conducta de descanso se retard&oacute; pero se conserv&oacute; el patr&oacute;n t&iacute;pico de la SSC.</font></p>     <p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/rmac/v36n2/a3f4.jpg"></font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Discusi&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Estudios previos han mostrado que la actividad de la serotonina en el hipot&aacute;lamo est&aacute; relacionada con el control de la conducta alimentaria y el peso corporal (Leibowitz, et al., 1993; Leibowitz &amp; Alexander, 1998). Los estudios en roedores indican que bajas dosis de 5&#150;HT o de f&aacute;rmacos que incrementan la liberaci&oacute;n de la 5&#150;HT inhiben de forma preferencial la ingesta de carbohidratos m&aacute;s que la de grasas o prote&iacute;nas (Wurtman &amp; Wurtman, 1977, 1979 a, 1979b). Este fen&oacute;meno es mediado en parte por receptores 5&#150;HT localizados en varios n&uacute;cleos del hipot&aacute;lamo medio. En la presente investigaci&oacute;n, la administraci&oacute;n del agonista 8&#150;OH&#150;DPAT en el NVH increment&oacute; la ingesti&oacute;n de alimento, particularmente el efecto se observ&oacute; sobre la ingesti&oacute;n de carbohidratos. Este resultado concuerda con estudios en los que se ha reportado que la administraci&oacute;n de 8&#150;OH&#150;DPAT aument&oacute; la ingesta de alimento (Dourish, et al., 1985; Dourish, et al., 1986; Hutson, et al., 1988). Los reportes tambi&eacute;n se&ntilde;alan que una dieta rica en carbohidratos puede facilitar el efecto hiperf&aacute;gico inducido por el 8&#150;OH&#150;DPAT (Jhanwar&#150;Uniyal, et al., 1994; Voigt, Nwaiser, Rex, Mayer &amp; Fink, 2004). Posiblemente este efecto se deba a la estimulaci&oacute;n de receptores 5&#150;HT<Sub>1A</Sub> somatodendr&iacute;ticos y a la consecuente reducci&oacute;n de la actividad serotonin&eacute;rgica, indicando el predominio de un sitio de acci&oacute;n presin&aacute;ptico (Hoyer, Hannon &amp; Martin, 2002). Sin embargo el mecanismo de acci&oacute;n se vuelve m&aacute;s complejo al considerar que la activaci&oacute;n del receptor 5&#150;HT<Sub>1A</Sub> induce cambios en las concentraciones de glucosa cerebral (Grasby, Sharp, Allen &amp; Grahame&#150;Smith, 1992). Particularmente en la presente investigaci&oacute;n la concentraci&oacute;n de glucosa en sangre mostr&oacute; una tendencia a reducirse al administrar el 8&#150;OH&#150;DPAT. Estos resultados son consistentes con los reportados en investigaciones previas en donde se se&ntilde;ala que el agonista 8&#150;OH&#150;DPAT estimula la ingesta de alimento pero tambi&eacute;n reduce los niveles de glucosa en el hipot&aacute;lamo, sugiriendo que los receptores 5&#150;HT<Sub>1A</Sub> no solo est&aacute;n implicados en el control hipotal&aacute;mico de la 5&#150;HT sino tambi&eacute;n en el control hipotal&aacute;mico de la glucosa (Voigt, et al., 2004). Hay evidencias de que el hipot&aacute;lamo participa en el control auton&oacute;mico del balance de glucosa e insulina. Espec&iacute;ficamente el NVH ha constituido un centro de atenci&oacute;n debido a que las neuronas localizadas en este n&uacute;cleo modulan la concentraci&oacute;n de glucosa (Song, Levin, McArdle, Bakhos &amp; Routh, 2001; De Vries, Arseneau, Lawson &amp; Beverly, 2003). Incluso se habla de la existencia de cuatro subtipos de neuronas sensibles a glucosa en el NVH que participan en la modulaci&oacute;n del inicio y el t&eacute;rmino de la alimentaci&oacute;n (Routh, 2002). Jhanwar&#150;Uniyal, et al., (1994) sugieren que los niveles de glucosa y de insulina son un factor determinante en la hiperfagia inducida por el 8&#150;OH&#150;DPAT. Indicando que mientras la hiperfagia es mediada por mecanismos presin&aacute;pticos, los niveles de glucosa e insulina son regulados v&iacute;a receptores 5&#150;HT<Sub>1A</Sub> postsin&aacute;pticos. Adicionalmente, se ha demostrado que en el NVH se expresan neuronas glutamat&eacute;rgicas y Gaba&eacute;rgicas (Collin, et al., 2003; Commmons, Kow, Milner &amp; Pfaff, 1999; Ziegler, Cullinan &amp; Herman, 2002), sistemas de neurotransmisores que tambi&eacute;n han sido relacionados con el control de la conducta alimentaria (Escart&iacute;n, et al., 2009; Gradison &amp; Guidotti, 1977; Kelly &amp; Grossman, 1979;  L&oacute;pez, et al., 2000). El nivel de GABA end&oacute;geno del NVH y la actividad de la enzima glutamato descarboxilasa (GAD) tambi&eacute;n son dependientes de los niveles de glucosa. Bajos niveles de glucosa elevan la liberaci&oacute;n de GABA e incrementan la actividad de la GAD mientras que altos niveles de glucosa tienen efectos opuestos (Kamatchi, Veeraragavan, Chandra &amp; Bapna, 1986). Por otro lado, tambi&eacute;n hay una fuerte expresi&oacute;n de aminas en el NVH tales como la noradrenalina, dopamina e histamina (Beverly, de Vries, Beverly &amp; Arseneau, 2000; Brown, Stevens &amp; Haas, 2001; Lee, et al., 2007). De forma particular Chaouloff y Jeanrenaud (1987) se&ntilde;alan que los cambios inducidos por el 8&#150;OH&#150;DPAT son mediados por receptores &#945;2&#150;adrenoreceptores. Adicionalmente Beverly et al., (2000) sugieren la interacci&oacute;n del sistema noradren&eacute;rgico y gaba&eacute;rgico bajo condiciones de glucoprivaci&oacute;n. </font></p>     <p align="justify"><font face="verdana" size="2">El an&aacute;lisis de la secuencia de saciedad conductual indica en el grupo control el desarrollo ordenado de la conducta alimentaria, es decir los sujetos comen, presentan conductas activas (locomoci&oacute;n, acicalarse, rascarse) y posteriormente descansan, patr&oacute;n estereotipado que se ha caracterizado en investigaciones previas, y que se considera como un indicador de la saciedad (Gao et al., 1998; Halford et al<I>.</I>, 1998; McGuirk, Muscat &amp; Willner, 1992; Vickers, Clifton, Dourish &amp; Tecott, 1999). En el grupo 8&#150;OH&#150;DPAT el orden de aparici&oacute;n de las conductas corresponde a la SSC t&iacute;pica sin embargo la presencia de estas conductas se demor&oacute;. La duraci&oacute;n de la ingesta de alimento se prolong&oacute; a trav&eacute;s de los periodos de observaci&oacute;n, retardando la presentaci&oacute;n de otras conductas como son la locomoci&oacute;n, el acicalarse y el descanso en relaci&oacute;n al grupo control. Consecuentemente la transici&oacute;n entre la ingesta y la conducta de descanso se retardo, sugiriendo la demora del proceso de satisfacci&oacute;n. Por tanto el aumento de la ingesta de alimento al administrar el 8&#150;OH&#150;DPAT en el n&uacute;cleo ventromedial hipotal&aacute;mico se explica debido a la inhibici&oacute;n del proceso de satisfacci&oacute;n, es decir se prolonga el t&eacute;rmino del intervalo de alimentaci&oacute;n. </font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La participaci&oacute;n del receptor 5&#150;HT<Sub>1A</Sub> sobre la ingesta de alimento es controversial. Probablemente estas controversias respondan a la utilizaci&oacute;n de las diferentes metodolog&iacute;as de investigaci&oacute;n, como se ha sugerido en algunos reportes, pero tambi&eacute;n a la activaci&oacute;n de circuitos neuronales complejos dependientes de la dosis y n&uacute;cleo cerebral en el que se est&eacute; administrando el f&aacute;rmaco. La activaci&oacute;n del receptor 5&#150;HT<Sub>1A</Sub> es &uacute;nicamente el inicio de arranque de un circuito en donde est&aacute;n interaccionando varios sistemas de neurotrasmisores. El efecto hiperf&aacute;gico inducido por la administraci&oacute;n del 8&#150;OH&#150;DPAT sugiere estar ligado a la afectaci&oacute;n del t&eacute;rmino de la alimentaci&oacute;n, esto es demorando el proceso de satisfacci&oacute;n. Estos resultados sugieren una importante participaci&oacute;n de los receptores 5&#150;HT<Sub>1A</Sub> sobre mecanismos conductuales espec&iacute;ficos; regulando la ingesta de alimento, el proceso de satisfacci&oacute;n y facilitando la ingesta voluntaria de carbohidratos.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusi&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2">Los resultados de esta investigaci&oacute;n sugieren que el efecto hiperf&aacute;gico inducido por la administraci&oacute;n del agonista 8&#150;OH&#150;DPAT en el NVH solo puede ser explicado en parte por la participaci&oacute;n de los receptores 5&#150;HT<Sub>1A</Sub>. Probablemente los cambios en los niveles de glucosa debidos a la estimulaci&oacute;n de los receptores 5&#150;HT<Sub>1A </Sub>sea el detonador de arranque de un circuito complejo en el que est&aacute;n interaccionando otros sistemas de neurotransmisores, entre los que destacan el sistema noradren&eacute;rgico y gaba&eacute;rgico que por si mismos han sido relacionados con el control de la conducta alimentaria. El incremento de la ingesta de alimento al administrar el 8&#150;OH&#150;DPAT se debi&oacute; a la inhibici&oacute;n del proceso de satisfacci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Beverly, J. L., De Vries, M. G., Beverly, M. F. &amp; Arseneau, L. M. (2000). Norepinephrine mediates glucoprivic&#150;induced increase in GABA in the ventromedial hypothalamus of rats. <I>American Journal of </I>R<I>egulatory, </I>I<I>ntegrative and </I>C<I>omparative Physiology, 279, </I>R990&#150;R996.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7389552&pid=S0185-4534201000020000300001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Blundell, J. E. (1984). Serotonin and appetite. <I>Neuropharmacology, 23(128), </I>1537&#150;1551.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7389554&pid=S0185-4534201000020000300002&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[<!-- ref --><p align="justify"><font face="verdana" size="2">Wurtman, J. D. &amp; Wurtman, R. J. (1979 b). Fenfluramine and other serotonergic drugs depress food intake and carbohydrate consumption while sparing protein consumption<I>.</I> <I>Current Medical Research Opinion, 6 (Suppl. I), </I>28&#150;33.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7389676&pid=S0185-4534201000020000300063&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --> </font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">Ziegler, D. R., Cullinan, W. E. &amp; Herman, J. P. (2002). Distribution of vesicular glutamate transporter mRNA in rat hypothalamus. T<I>he Journal of </I>C<I>omparative Neurology, 448, </I>217&#150;229.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7389678&pid=S0185-4534201000020000300064&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Nota</b></font></p>     <p align="justify"><font face="verdana" size="2">Proyecto financiado por DGAPA, PAPIIT IN309008. Contribuci&oacute;n de los autores: L&oacute;pez ABCDEF, Mancilla ABCDEFG, Rito ABCDEF, Jim&eacute;nez BF, D&iacute;az BF, donde: A = Dise&ntilde;o de Estudio, B = Recolecci&oacute;n de Datos, C = An&aacute;lisis Estad&iacute;stico, D = Interpretaci&oacute;n de Datos, E = Preparaci&oacute;n de Manuscrito, F = B&uacute;squeda Bibliogr&aacute;fica, G = Gesti&oacute;n de Financiamiento. </font></p>      ]]></body><back>
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