<?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>0123-9392</journal-id>
<journal-title><![CDATA[Infectio]]></journal-title>
<abbrev-journal-title><![CDATA[Infect.]]></abbrev-journal-title>
<issn>0123-9392</issn>
<publisher>
<publisher-name><![CDATA[Asociación Colombiana de Infectología.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0123-93922013000200007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Plantas con actividad fotosensibilizadora y potencial terapéutico en leishmaniasis cutánea: hipericina, una alternativa prometedora]]></article-title>
<article-title xml:lang="en"><![CDATA[Plants with photosensitizing activity and therapeutic potential in cutaneous leishmaniasis: Hypericin, a promising alternative]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Taylor O]]></surname>
<given-names><![CDATA[Viviana Milena]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ríos R]]></surname>
<given-names><![CDATA[Yesmit Karina]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[León R]]></surname>
<given-names><![CDATA[Daniel Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Tecnológico Metropolitano GI2B Grupo de Investigación e Innovación Biomédica]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Santander Laboratorio Clínico Programa de Bacteriología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Universidad de Caldas Departamento de Química ]]></institution>
<addr-line><![CDATA[Manizales ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2013</year>
</pub-date>
<volume>17</volume>
<numero>2</numero>
<fpage>90</fpage>
<lpage>102</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0123-93922013000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0123-93922013000200007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0123-93922013000200007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La leishmaniasis es una enfermedad endémica en 98 países, con más de 350 millones de personas en riesgo de adquirir la infección y 12 millones de personas infectadas. Numerosas desventajas asociadas a los tratamientos actuales promueven la falta de adherencia o abandono del tratamiento y la aparición de cepas resistentes al medicamento. Estos factores han estimulado la búsqueda de alternativas terapéuticas que sean rápidas, seguras, de fácil administración y económicas. Surge así la etnobotánica, que en combinación con la fototerapia puede convertirse en una estrategia innovadora para la búsqueda de compuestos de origen natural con actividad leishmanicida, donde productos como la hipericina pueden ser considerados candidatos prometedores en el descubrimiento y desarrollo de nuevos tratamientos. La hipericina es una molécula de origen natural que presenta un rendimiento cuántico alto en su estado triplete y genera eficientemente especies reactivas de oxígeno, lo cual posiblemente la hace un buen agente leishmanicida al ser aplicado en los tejidos infectados, además de ser posiblemente un potencial agente cicatrizante, que otorga un efecto cosmético favorable en la resolución de la lesión, con amplias ventajas como bajo costo y fácil manejo, convirtiéndose en una alternativa favorable frente a otras usadas en el manejo de la enfermedad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Leishmaniasis is a disease endemic to 98 countries, with over 350 million people at risk of acquiring the infection and 12 million people already infected. The numerous disadvantages associated with current treatments encourage a lack of adherence and even abandonment of the disease treatment, resulting in the emergence of drug-resistant strains. These factors have stimulated the search for therapeutic alternatives that are fast, safe, easy to administer and economical. This has resulted in the emergence of ethnobotany, which, along with phototherapy, could become an innovative strategy for finding naturally occurring compounds with leishmanicidal activity. In this context, products such as hypericin could be considered promising candidates in the discovery and development of new treatments. Hypericin is a naturally occurring molecule that has a high quantum yield in its triplet state and efficiently generates reactive oxygen species. These properties could make hypericin an effective leishmanicidal agent when applied over infected tissues and a potential healing agent that provides cosmetic effects favorable to lesion resolution. In addition, its significant advantages in terms of low cost and easy handling make hypericin a favorable alternative to other treatments for managing this disease.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Fototerapia]]></kwd>
<kwd lng="es"><![CDATA[Leishmania spp]]></kwd>
<kwd lng="es"><![CDATA[Plantas]]></kwd>
<kwd lng="es"><![CDATA[Hipericina]]></kwd>
<kwd lng="en"><![CDATA[Phototherapy]]></kwd>
<kwd lng="en"><![CDATA[Leishmania spp]]></kwd>
<kwd lng="en"><![CDATA[Plants]]></kwd>
<kwd lng="en"><![CDATA[Hypericin]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p>REVISI&Oacute;N </p>     <p><font size="4"><b>Plantas con actividad fotosensibilizadora y potencial terap&eacute;utico en leishmaniasis cut&aacute;nea: hipericina, una alternativa prometedora </b></font></p>     <p><b>Viviana Milena Taylor O. </b><b><sup>a,*</sup></b>, <b>Yesmit Karina R&iacute;os R. </b><b><sup>b</sup> </b><b>y Daniel Arturo Le&oacute;n R. </b><b><sup>c</sup></b></p>     <p><sup>a</sup> <i>Grupo de Investigaci&oacute;n e Innovaci&oacute;n Biom&eacute;dica, GI2B, Instituto Tecnol&oacute;gico Metropolitano, Medell&iacute;n, Colombia </i></p>     <p><sup>b</sup> <i>Programa de Bacteriolog&iacute;a y Laboratorio Cl&iacute;nico, Universidad de Santander, C&uacute;cuta, Colombia </i></p>     <p><sup>c</sup> <i>Departamento de Qu&iacute;mica, Universidad de Caldas, Manizales, Colombia </i></p>     <p>Recibido el 13 de diciembre de 2012; aceptado el 2 de octubre de 2013 </p> <hr size="1">     <p><b>Resumen</b></p>     <p>La leishmaniasis es una enfermedad end&eacute;mica en 98 pa&iacute;ses, con m&aacute;s de 350 millones de personas en riesgo de adquirir la infecci&oacute;n y 12 millones de personas infectadas. Numerosas desventajas asociadas a los tratamientos actuales promueven la falta de adherencia o abandono del tratamiento y la aparici&oacute;n de cepas resistentes al medicamento. Estos factores han estimulado la b&uacute;squeda de alternativas terap&eacute;uticas que sean r&aacute;pidas, seguras, de f&aacute;cil administraci&oacute;n y econ&oacute;micas. Surge as&iacute; la etnobot&aacute;nica, que en combinaci&oacute;n con la fototerapia puede convertirse en una estrategia innovadora para la b&uacute;squeda de compuestos de origen natural con actividad leishmanicida, donde productos como la hipericina pueden ser considerados candidatos prometedores en el descubrimiento y desarrollo de nuevos tratamientos. </p>     ]]></body>
<body><![CDATA[<p>La hipericina es una mol&eacute;cula de origen natural que presenta un rendimiento cu&aacute;ntico alto en su estado triplete y genera eficientemente especies reactivas de ox&iacute;geno, lo cual posiblemente la hace un buen agente leishmanicida al ser aplicado en los tejidos infectados, adem&aacute;s de ser posiblemente un potencial agente cicatrizante, que otorga un efecto cosm&eacute;tico favorable en la resoluci&oacute;n de la lesi&oacute;n, con amplias ventajas como bajo costo y f&aacute;cil manejo, convirti&eacute;ndose en una alternativa favorable frente a otras usadas en el manejo de la enfermedad. </p>     <p>&copy; 2013 ACIN. Publicado por Elsevier Espa&ntilde;a, S.L. Todos los derechos reservados. </p>     <p><b>PALABRAS CLAVE </b></p>     <p>Fototerapia; <i>Leishmania </i>spp.; Plantas; Hipericina</p> <hr size="1">     <p><font size="3"><b>Plants with photosensitizing activity and therapeutic potential in cutaneous leishmaniasis: Hypericin, a promising alternative </b></font></p>     <p><b>Abstract</b></p>     <p>Leishmaniasis is a disease endemic to 98 countries, with over 350 million people at risk of acquiring the infection and 12 million people already infected. The numerous disadvantages associated with current treatments encourage a lack of adherence and even abandonment of the disease treatment, resulting in the emergence of drug-resistant strains. These factors have stimulated the search for therapeutic alternatives that are fast, safe, easy to administer and economical. This has resulted in the emergence of ethnobotany, which, along with phototherapy, could become an innovative strategy for finding naturally occurring compounds with leishmanicidal activity. In this context, products such as hypericin could be considered promising candidates in the discovery and development of new treatments. </p>     <p>Hypericin is a naturally occurring molecule that has a high quantum yield in its triplet state and efficiently generates reactive oxygen species. These properties could make hypericin an effective leishmanicidal agent when applied over infected tissues and a potential healing agent that provides cosmetic effects favorable to lesion resolution. In addition, its significant advantages in terms of low cost and easy handling make hypericin a favorable alternative to other treatments for managing this disease. </p>     <p>&copy; 2013 ACIN. Published by Elsevier Espa&ntilde;a, S.L. All rights reserved. </p>     <p><b>KEYWORDS: </b></p>     ]]></body>
<body><![CDATA[<p>Phototherapy; <i>Leishmania </i>spp.; Plants; Hypericin </p> <hr size="1">     <p><b>Introducci&oacute;n </b></p>     <p>La leishmaniasis es una enfermedad parasitaria de amplia distribuci&oacute;n mundial, end&eacute;mica en 98 pa&iacute;ses de regiones tropicales y subtropicales, con m&aacute;s de 350 millones de personas en riesgo de adquirir la infecci&oacute;n, 12 millones de personas infectadas y 2 millones de nuevos casos por a&ntilde;o<sup>1</sup> (0,5 millones de leishmaniasis visceral y 1,5 millones de leishmaniasis cut&aacute;nea). </p>     <p>En Colombia, durante el a&ntilde;o 2012 se registraron 9.595 casos de leishmaniasis cut&aacute;nea<sup>2</sup> (LC), la forma cl&iacute;nica m&aacute;s prevalente en el pa&iacute;s, y para el a&ntilde;o 2013 se han reportado 4.386 nuevos casos<sup>3</sup>. Sin embargo, estas cifras no se ajustan a la realidad, pues la mayor&iacute;a de los datos oficiales son reportados a partir de la detecci&oacute;n pasiva de casos y la mayor parte de las infecciones no son diagnosticadas o informadas, por presentarse en zonas rurales de dif&iacute;cil acceso, lo cual dificulta tanto el diagn&oacute;stico como el tratamiento<sup>4</sup>. </p>     <p>Los compuestos de antimonio pentavalente, la anfotericina B, el isotianato de pentamidina y la miltefosina son los medicamentos de elecci&oacute;n para el tratamiento de todas las formas de leishmaniasis<sup>1</sup>. No obstante, la utilizaci&oacute;n de dichos f&aacute;rmacos tiene desventajas, como el alto costo que representa para los gobiernos el suministro del medicamento a la poblaci&oacute;n afectada, la duraci&oacute;n del tratamiento, los efectos secundarios asociados a la toxicidad y las v&iacute;as de aplicaci&oacute;n de los f&aacute;rmacos<sup>5</sup>. Todos estos problemas estimulan la falta de adherencia al tratamiento, promoviendo la reactivaci&oacute;n de la lesi&oacute;n, el compromiso de mucosas o la aparici&oacute;n de resistencia del par&aacute;sito<sup>6</sup>. </p>     <p>A estas dificultades se suma la falta de motivaci&oacute;n econ&oacute;mica para que las compa&ntilde;&iacute;as farmac&eacute;uticas que invierten en programas de investigaci&oacute;n y desarrollo de medicamentos para el tratamiento de enfermedades como la leishmaniasis<sup>7</sup>. </p>     <p>Por lo anteriormente expuesto, la Organizaci&oacute;n Mundial de la Salud, a trav&eacute;s de su Programa Especial para la Investigaci&oacute;n en Enfermedades Tropicales (TDR) junto con varias Organizaciones No Gubernamentales (ONGs), ha establecido como prioridad el descubrimiento y desarrollo de nuevos tratamientos para la leishmaniasis que sean r&aacute;pidos, seguros, de f&aacute;cil administraci&oacute;n y econ&oacute;micos<sup>8</sup>. </p>     <p>Surge as&iacute; la etnobot&aacute;nica, que en combinaci&oacute;n con la fototerapia puede convertirse en una estrategia innovadora para la b&uacute;squeda de compuestos de origen natural con actividad leishmanicida, donde productos como la hipericina pueden ser considerados candidatos prometedores en el descubrimiento y desarrollo de nuevos tratamientos. </p>     <p>Para la realizaci&oacute;n de esta revisi&oacute;n, se hizo una b&uacute;squeda en las bases de datos Pubmed, Medline y Ovid, combinando los t&eacute;rminos <i>Hypericin </i>, <i>Phototherapy, Leishmania </i>, <i>Phototoxic, Phototoxicity Plants, Leishmanicidal and Natural Products. </i>Se incluyeron 104 art&iacute;culos, entre revisiones e investigaciones originales. </p>     <p><b>Plantas con actividad leishmanicida </b></p>     ]]></body>
<body><![CDATA[<p>La evaluaci&oacute;n de productos naturales le ha dado a la medicina tradicional un renovado inter&eacute;s en la b&uacute;squeda de sustancias potencialmente activas, &uacute;tiles para combatir enfermedades, y leishmaniasis no es la excepci&oacute;n<sup>8</sup>. </p>     <p>Las plantas han demostrado tener un amplio arsenal de sustancias usadas por pueblos ind&iacute;genas para el tratamiento de la leishmaniasis cut&aacute;nea. As&iacute; lo han mostrado estudios etnobot&aacute;nicos como los realizados por Odonne et al. en el 2009, quienes documentaron plantas usadas por la comunidad Chayahuita en las selvas del Per&uacute;, para combatir la leishmaniasis desde la perspectiva tradicional de la comunidad<sup>9</sup>. De hecho, la OMS estima que aproximadamente el 80% de la poblaci&oacute;n mundial acude continuamente a este tipo de tratamientos<sup>10</sup>. </p>      <p>Rocha et al. en el 2005 revisaron un amplio n&uacute;mero de productos naturales con actividad leishmanicida, en su mayor&iacute;a provenientes de plantas, que demuestran la relevancia de validar su uso en la medicina popular. A su vez, concluyen que el reporte de un importante n&uacute;mero de mol&eacute;culas aisladas (hasta el 2005, 239 mol&eacute;culas definidas qu&iacute;micamente) de productos naturales representa un avance significativo en la b&uacute;squeda de nuevos agentes antiprotozoarios<sup>11</sup>. </p>     <p>Entre los productos naturales con actividad leishmanicida reportada recientemente, se pueden citar alcaloides como la Dicentrinona de <i>Duguetia furfur&aacute;cea </i>, que mostr&oacute; una IC50 de 0,01 &micro;M<sup>12</sup>, <i>Baccharis dracunculifolia </i>con IC50 de 3,7 &micro;g/ml para el &aacute;cido urs&oacute;lico y 7,0 &micro;g/ml para el &aacute;cido hautriwaico, componentes activos de su extracto<sup>13</sup>. El extracto etan&oacute;lico de <i>Tinospora sinensis </i>exhibi&oacute; una actividad apreciable contra promastigotes y amastigotes intracelulares de <i>Leishmania </i>, con IC50 de 37,6 &micro;g/ml y 29,8 &micro;g/ml, respectivamente<sup>14</sup>. </p>     <p>Los aceites esenciales de <i>Coriandrum sativum </i>, <i>Lippia sidoides </i>y oleorresinas de <i>Copaifera reticulata </i>demostraron tener una acci&oacute;n importante sobre amastigotes y promastigotes de <i>Leishmania chagasi </i>. En este estudio, <i>Copaifera reticulata </i>mostr&oacute; una IC50 de 7,88 &micro;g/ml en promastigotes y 0,52 &micro;g/ml en amastigotes intracelulares, <i>Coriandrum sativum </i>exhibi&oacute; una IC50 de 181 &micro;g/ml en promastigotes y 1,51 &micro;g/ml en amastigotes intracelulares y <i>Lippia sidoides </i>mostr&oacute; una IC50 de 19,76 &micro;g/ml para promastigotes y 5,07 &micro;g/ml para amastigotes<sup>15</sup>. </p>     <p>Fracciones de <i>Coriandrum sativum </i>y <i>Ricinus communis </i>mostraron tener actividad sobre amastigotes intracelulares de este mismo par&aacute;sito, con IC50 de 27,334 &micro;g/ml y 17,28 &micro;g/ml, respectivamente<sup>16</sup>. </p>     <p>En especies de <i>Leishmania </i>, principalmente del nuevo mundo, los extractos y fracciones de hojas y frutos de <i>Azadirachta indica </i>se destacan por ser efectivas sobre amastigotes y promastigotes de <i>Leishmania amazonensis </i>. El extracto etan&oacute;lico de las hojas y las fracciones diclorometano y clorof&oacute;rmicas presentaron valores de IC50 de 38, 3,9 y 1,2 &micro;g/ml sobre promastigotes y 9,8, 1,1 y 0,6 &micro;g/ml para amastigotes, respectivamente. Por su parte el extracto etan&oacute;lico y la fracci&oacute;n diclorometano del fruto presentaron una IC50 de 2,7 y 2,1 &micro;g/ml para promastigotes y 0,4 y 0,6 &micro;g/ml para amastigotes intracelulares<sup>17</sup>. Tambi&eacute;n se resalta la actividad de los extractos alcoh&oacute;licos de <i>Hura crepitans </i>, <i>Bambusa vulgaris, Mangifera indica </i>y <i>Simarouba glauca </i><sup>18</sup> sobre amastigotes intracelulares de <i>Leishmania amazonensis </i>, e igualmente los extractos alcoh&oacute;licos de <i>Bidens pilosa </i>L. y <i>Punica granatum </i>L. son altamente efectivos sobre amastigotes intracelulares de <i>Leishmania amazonensis </i>con IC50 de 42,6 y 69,6 &micro;g/ml, respectivamente<sup>19</sup>. </p>     <p>Con el aceite de <i>Piper auritum </i>se ha observado actividad sobre promastigotes de <i>L. major </i>, <i>L. mexicana, L. braziliensis </i>y <i>L. donovani </i>con IC50 de 29,1, 63,3, 52,1 y 12,8 &micro;g/ml, respectivamente<sup>20</sup>. </p>     <p>Extractos, aceites y fracciones de plantas comunes como manzanilla <i>(Matricaria chamomilla) </i>, banano <i>(Musa paradisiaca) </i>y <i>Aloe vera </i>, tambi&eacute;n han sido probados, con resultados muy prometedores<sup>16,21,22</sup>. </p>     <p>Biomol&eacute;culas extra&iacute;das de plantas han demostrado muy buena actividad <i>in vitro </i>sobre <i>Leishmania </i>, como lo expone la investigaci&oacute;n realizada por Kuroyanagi et al. en 2012 con las withanolidas de <i>Withania coagulans </i>. En este estudio se evaluaron 11 withanolidas provenientes de esta planta sobre promastigotes de <i>Leishmania major </i>, de las cuales las withanolidas 3, 6, 9 y 10 mostraron la mejor actividad con IC50 de 5,1, 4,7, 2,7 y 9,4 &micro;g/ml, respectivamente<sup>23</sup>. </p>     ]]></body>
<body><![CDATA[<p>Ram&iacute;rez-Mac&iacute;as et al. en 2012 encontraron una buena actividad en los flavonoides de <i>Delphinum staphisagria </i>sobre promastigotes, amastigotes intracelulares y amastigotes ax&eacute;nicos de <i>L. infantum </i>, en especial los flavonoides identificados como 6, 8 y 9<sup>24</sup>. </p>     <p>Otro hallazgo importante se report&oacute; en el estudio de Ghosal et al. en 2012 con el hallazgo de actividad de alcaloides derivados de <i>Piper longum </i>, sobre promastigotes y amastigotes ax&eacute;nicos de <i>Leishmania donovani </i>, como una clara muestra del efecto leishmanicida de estas biomol&eacute;culas<sup>25</sup>. </p>     <p>En la <a href="#tabla1">tabla 1</a> se resumen las principales plantas con actividad leishmanicida. </p>     <p>    <center>   <a name="tabla1"><img src="img/revistas/inf/v17n2/v17n2a07t1.gif"></a></center> </p>     <p>    <center>   <a name="tabla1"><img src="img/revistas/inf/v17n2/v17n2a07t1b.gif"></a></center> </p>     <p>    <center>   <a name="tabla1"><img src="img/revistas/inf/v17n2/v17n2a07t1c.gif"></a></center> </p>     <p><b>Plantas con actividad fotot&oacute;xica en fototerapia </b></p>     ]]></body>
<body><![CDATA[<p>La fototerapia es un procedimiento en el cual un agente fotosensibilizador, que corresponde a un compuesto con estructura macroc&iacute;clica de dobles dienos conjugados, es activado por luz en presencia de ox&iacute;geno molecular a longitudes de onda entre 600 y 850 nm e intensidades de 150 mW/cm2, con la producci&oacute;n directa o indirecta de especies reactivas del ox&iacute;geno<sup>26</sup> (ROS), las cuales reaccionan con organelas, prote&iacute;nas y ADN, causando apoptosis o necrosis de las c&eacute;lulas que contienen el agente fotosensibilizador<sup>27</sup>. </p>     <p>La fototerapia ha sido utilizada desde comienzos del siglo XX en el tratamiento de diferentes tipos de c&aacute;ncer, vit&iacute;ligo, psoriasis, herpes y otras enfermedades e infecciones localizadas<sup>28,29</sup>. </p>     <p>El desarrollo de la fototerapia como alternativa terap&eacute;utica, en la actualidad, ha promovido la b&uacute;squeda de nuevos agentes fotosensibilizadores a partir de la s&iacute;ntesis org&aacute;nica y, m&aacute;s recientemente, a partir de plantas y otros productos naturales<sup>30</sup>. La fototoxicidad de productos naturales es un fen&oacute;meno que se viene estudiando con detenimiento debido a que, si bien puede inducir da&ntilde;o a nivel celular, tambi&eacute;n puede producir efectos ben&eacute;ficos a nivel terap&eacute;utico como se observa en fototerapia. Como prueba de esto, en 2010 y 2011 Bark et al. estimaron que al menos un cuarto de las plantas medicinales usadas en la medicina oriental podr&iacute;an ser fotot&oacute;xicas, pero que esta propiedad puede ser aprovechada terap&eacute;uticamente<sup>31,32</sup>. </p>     <p>Un importante n&uacute;mero de plantas han sido objeto de estudio en los &uacute;ltimos a&ntilde;os por sus cualidades fotot&oacute;xicas y se est&aacute;n considerando actualmente dentro de la investigaci&oacute;n en fototerapia. Es as&iacute; como los componentes a&eacute;reos de <i>Ficus carica </i>se est&aacute;n postulando como potenciales agentes fotosensibilizadores a partir de los estudios desarrollados por Conforti et al., 2012, quienes observaron una importante actividad anti-oxidante y antiproliferativa sobre c&eacute;lulas de melanoma humanas atribuidas a las cumarinas, fenoles y &aacute;cidos grasos obtenidos de las hojas de esta planta, haciendo que esta planta se destaque como fuente de componentes bioactivos de uso en fototerapia para tratamiento de c&aacute;ncer de piel<sup>33</sup>. </p>     <p>Los floroglucinoles extra&iacute;dos a partir de las hojas de <i>Syzygium polyanthum </i>, una planta de la familia Myrtaceae, reportados como antuminoato y antuminona por Har et al. (2012), mostraron una inhibici&oacute;n importante al ser probados sobre c&eacute;lulas tumorales y se presentan de esta forma como posibles agentes de uso en fototerapia<sup>34</sup>. De la misma manera Chee et al. (2005) encontraron en las hojas de <i>Aglaonema simplex </i>, otra planta de la biodiversidad de pa&iacute;ses tropicales, mol&eacute;culas de tipo feoforbido con potencial fototoxicidad sobre c&eacute;lulas de leucemia humana HL60<sup>35</sup>. </p>     <p>Otro feoforbido aislado de <i>Scutellaria barbata </i>, al ser activado por la luz, mostr&oacute; una importante acci&oacute;n sobre c&eacute;lulas MDA-MB-231 explicada por el aumento de la apoptosis por medio de la supresi&oacute;n de la autofagia mediada por la cinasa ERK<sup>36</sup>. Investigaciones con esta misma mol&eacute;cula describen su acci&oacute;n como agente fotosensibilizador en fototerapia sobre distintas l&iacute;neas celulares cancerosas<sup>37,38</sup>. </p>     <p>Otras mol&eacute;culas de reciente descubrimiento con actividad fotot&oacute;xica y con potencial uso en fototerapia son las antraquinonas aisladas de <i>Heterophyllaea pustulata </i><sup>39</sup> y los beta-glucanos de la cebada <i>Hordeum vulgare </i>L.<sup>40</sup>. </p>     <p><b>Mecanismo de acci&oacute;n de la hipericina en fototerapia </b></p>     <p>Recientemente la hipericina ha empezado a atraer la atenci&oacute;n de los investigadores como un promisorio agente fotosensibilizador<sup>41</sup>. Este es un compuesto de origen natural extra&iacute;do de <i>Hypericum perforatum </i>, una planta que ha sido usada por mucho tiempo para el tratamiento de trastornos depresivos, dolores abdominales, infecciones bacterianas, migra&ntilde;a y para favorecer la cicatrizaci&oacute;n<sup>42-44</sup>. </p>     <p>Los reportes acerca del uso potencial de la hipericina en fototerapia datan de hace casi 25 a&ntilde;os<sup>45</sup>. Es una mol&eacute;cula que se caracteriza por tener alto rendimiento cu&aacute;ntico generando una alta producci&oacute;n de ox&iacute;geno singlete y otras especies reactivas de ox&iacute;geno, bajo fotoblanqueo y m&iacute;nima toxicidad, caracter&iacute;sticas que son fundamentales para las aplicaciones biol&oacute;gicas y cl&iacute;nicas de un fotosensibilizador<sup>46-48</sup>. </p>     ]]></body>
<body><![CDATA[<p>La hipericina resulta &uacute;til para el tratamiento de enfermedades de la piel ya que no solo es una sustancia de origen natural que puede ser bien aceptada por los pacientes, sino que consiste en un tratamiento suave que induce apoptosis en las c&eacute;lulas afectadas sin provocar una respuesta inflamatoria exacerbada<sup>49</sup>. </p>     <p>El mecanismo de acci&oacute;n de la hipericina como agente fotosensibilizador permanece como motivo de estudio, al igual que su optimizaci&oacute;n en aplicaciones cl&iacute;nicas. Una de las razones es que, de manera similar a muchos de los fotosensibilizadores cl&iacute;nicamente usados, se ha informado que la hipericina se localiza en varios compartimentos celulares y subcelulares, incluyendo membrana plasm&aacute;tica, ret&iacute;culo endopl&aacute;smico, mitocondria, lisosoma y aparato de Golgi<sup>45</sup>. </p>     <p>Dependiendo de su localizaci&oacute;n la hipericina induce apoptosis cuando se concentra en mitocondria<sup>50</sup> o puede predisponer a necrosis si se ubica en membrana citoplasm&aacute;tica o en los lisosomas<sup>51,52</sup>. Esta distribuci&oacute;n subcelular puede ser atribuida a caracter&iacute;sticas f&iacute;sicas y qu&iacute;micas que incluyen carga i&oacute;nica, hidrofobicidad o hidrofilicidad y simetr&iacute;a molecular<sup>53</sup>. En el caso de la hipericina, la distribuci&oacute;n en la c&eacute;lula se ver&iacute;a influenciada por el hecho de ser una mol&eacute;cula altamente lipof&iacute;lica, que estar&iacute;a enlaz&aacute;ndose preferencialmente a la matriz lip&iacute;dica de la membrana celular por encima de otras rganelas<sup>54</sup>, por lo que se hace primordial el uso de transportadores que aumenten la selectividad del compuesto una vez sea internalizado por las c&eacute;lulas, como por ejemplo sucede al conjugar la hipericina con liposomas, nanopart&iacute;culas o polifosfacanos biodegradables, que aumentan significativamente la solubilidad del compuesto en agua y etanol, en comparaci&oacute;n con la mol&eacute;cula libre<sup>55</sup>. </p>     <p>En los &uacute;ltimos a&ntilde;os, diversos estudios han revelado la multifac&eacute;tica actividad fotodin&aacute;mica de la hipericina. Se ha registrado que al ser estimulada con la luz induce peroxidaci&oacute;n de membranas lip&iacute;dicas<sup>56</sup>, aumenta la actividad super&oacute;xido dismutasa, incrementa los niveles de glutati&oacute;n<sup>57,58</sup></p>     <p>y se almacena en membrana celular formando estructuras estrechamente empaquetadas con el colesterol, lo cual se constituye en un factor clave de selectividad de la hipericina<sup>59</sup>. </p>     <p><b>Actividad antitumoral de la hipericina </b></p>     <p>Algunas investigaciones <i>in vitro </i>han mostrado las propiedades fotosensibilizadoras y antitumorales de la hipericina. </p>     <p>En un estudio realizado sobre c&eacute;lulas de carcinoma de colon HT-29 expuestas a hipericina combinada con hiperforina o su derivado aristoforina, se observ&oacute; alta letalidad de estas c&eacute;lulas, debido posiblemente a un arresto en la progresi&oacute;n del ciclo celular, por acci&oacute;n combinada de ambos compuestos de origen natural<sup>60</sup>. Otro estudio evalu&oacute; la efectividad de la hipericina versus el &aacute;cido delta aminolevul&iacute;nico (ALA) sobre la l&iacute;nea celular tumoral U-937 utilizando diodos emisores de luz (LED) a 637 nm. Se observ&oacute; que, mientras que las c&eacute;lulas tratadas con ALA proliferaban nuevamente, aquellas tratadas con hipericina mostraban y conservaban una viabilidad cercana al 0%<sup>61</sup>. De manera similar se observ&oacute; en esta misma l&iacute;nea celular que la incubaci&oacute;n por 3 horas con hipericina e irradiaci&oacute;n durante 15 minutos result&oacute; en una viabilidad del 0%, la cual se verific&oacute; luego de 5 horas post-irradiaci&oacute;n, con un notable aumento en la tasa de apoptosis celular<sup>62</sup>. </p>     <p>Investigaciones que involucran a la hipericina combinada con otros fotosensibilizadores naturales o sint&eacute;ticos u algunos tipos de inhibidores celulares han arrojado resultados interesantes. En un estudio que evalu&oacute; el efecto de la hipericina combinada con la clorina, se observ&oacute; alta toxicidad sobre c&eacute;lulas de carcinoma de c&eacute;lulas escamosas de cabeza y cuello, efecto explicado por el mecanismo apopt&oacute;tico de la hipericina y necr&oacute;tico de la clorina, y que combinados disminuyen la toxicidad en la oscuridad y pueden ser ben&eacute;ficos en la aplicaci&oacute;n de fototerapia cl&iacute;nica<sup>63</sup>. Otro estudio realizado en c&eacute;lulas de c&aacute;ncer de seno expuestas a hipericina combinada con la isoflavona de soja, geniste&iacute;na (inhibidor de la tirosina quinasa), mostr&oacute; notable aumento en la producci&oacute;n de ROS y supresi&oacute;n de la proliferaci&oacute;n celular<sup>64</sup>, resultado similar al observado con el inhibidor de la 5-lipoxigenasa, el MK-886, el cual combinado con la hipericina produjo un arresto masivo en el ciclo celular, con aumento de ciclina E y disminuci&oacute;n de la ciclina A e incapacidad de transici&oacute;n de la fase G1/S del ciclo celular<sup>65</sup>. </p>     <p>En cuanto a estudios de acci&oacute;n antitumoral de la hipericina en modelo animal, se observ&oacute; que en ratones con tumores de carcinoma nasofar&iacute;ngeo humano, tratados durante 6 horas con hipericina, aument&oacute; el nivel de apoptosis celular por una v&iacute;a mediada por cinc y activada directamente por la hipericina<sup>66</sup>. </p>     ]]></body>
<body><![CDATA[<p>Aunque son numerosos los estudios <i>in vitro </i>que demuestran el papel de la hipericina en fototerapia, son los reportes cl&iacute;nicos los que m&aacute;s le han dado credibilidad a la hipericina como prometedor agente fotosensibilizador en fototerapia. Esta mol&eacute;cula ha sido usada en tratamientos contra diversos tipos de c&aacute;ncer incluyendo c&aacute;ncer de ovario67, c&aacute;ncer nasofar&iacute;ngeo68, c&aacute;ncer pancre&aacute;tico69 y carcinomas de piel o melanoma, especialmente<sup>70,71</sup>. </p>     <p>En un estudio realizado en 12 pacientes con linfoma cut&aacute;neo de c&eacute;lulas T y en 12 pacientes con psoriasis, tratados con hipericina (con concentraciones de 0,1 y 0,25%) dos veces por semana durante 6 semanas, con una fluencia de 8-20 J/cm2, se observ&oacute; una significativa mejor&iacute;a en las lesiones de piel dependiente de la concentraci&oacute;n<sup>72</sup>. Otro estudio realizado en 2 pacientes con poroqueratosis act&iacute;nica superficial diseminada (PASD) tratados t&oacute;picamente con hipericina, con una fluencia de 90 J/cm2, no tuvo un resultado satisfactorio ya que solo 1 paciente mostr&oacute; alguna mejor&iacute;a. Sin embargo, el bajo n&uacute;mero de pacientes del estudio y la diferencia etiol&oacute;gica e histol&oacute;gica entre PASD y la queratosis act&iacute;nica, donde el tratamiento con hipericina en fototerapia ha sido exitoso, no permite hacer comparaciones claras ni dar explicaciones concluyentes<sup>73</sup>. </p>     <p>Finalmente es importante anotar que &uacute;ltimamente se viene utilizando la hipericina por sus propiedades fotosensibilizadoras, como herramienta eficaz en el diagn&oacute;stico de algunas formas de c&aacute;ncer. En un ensayo para visualizar selectivamente gliomas malignos, a 5 pacientes se les aplic&oacute; hipericina v&iacute;a intravenosa 6 horas antes del procedimiento quir&uacute;rgico, realizado bajo luz blanca. Durante el procedimiento se distingui&oacute; claramente el tejido tumoral, el cual se visualiz&oacute; rojo fluorescente y no se presentaron efectos secundarios asociados<sup>74</sup>. Otros estudios han mostrado la utilizaci&oacute;n de la hipericina en combinaci&oacute;n con sondas &oacute;pticas para el procesamiento de im&aacute;genes<sup>75</sup>. </p>     <p><b>Actividad antimicrobiana de la hipericina </b></p>     <p>Algunos estudios han evaluado <i>in vitro </i>el efecto antimicrobiano y fungicida de la hipericina en fototerapia. En un estudio realizado en varias especies de <i>Candida </i>expuestas a concentraciones de 0,625, 1,25, 2,5 y 40 &micro;m de hipericina, con una fluencia de 18 J/cm2 por l&aacute;mpara LED a 602 &plusmn; 10 nm, se observ&oacute; un efecto t&oacute;xico sobre las levaduras, sin citotoxicidad directa sobre queratinocitos y fibroblastos, por lo cual, al parecer, la hipericina puede ser considerado un agente fungicida que no causa da&ntilde;o significativo a c&eacute;lulas de la piel<sup>76</sup>. Otra investigaci&oacute;n evalu&oacute; el efecto antibacteriano de la hipericina en fototerapia. Colonias de <i>S. aureus </i>y <i>E. coli </i>fueron incubadas durante 30 minutos con hipericina y posteriormente irradiadas a 600-800 nm con una fluencia de 5-30 J/cm2. Se observ&oacute; que la combinaci&oacute;n de hipericina y luz indujo una significativa muerte en <i>S. aureus </i>, pero no en <i>E. coli </i>, debido posiblemente a la diferencia en la estructura de la pared/membrana entre ambos tipos bacterianos, lo cual puede influir directamente en la captaci&oacute;n de la hipericina por parte de estos microorganismos<sup>77</sup>. </p>     <p><b>Fototerapia en leishmaniasis cut&aacute;nea </b></p>     <p>Recientemente la fototerapia ha tomado importancia en el tratamiento de la leishmaniasis cut&aacute;nea con amplios beneficios y bajos costos, sin efectos colaterales asociados y con grandes ventajas en cuanto a resultados cosm&eacute;ticos<sup>29</sup>. </p>     <p>Son varios los estudios con fototerapia dirigidos al tratamiento de la LC. Desde las evaluaciones <i>in vitro </i>de compuestos libres y en formulaci&oacute;n liposomal como las ftalocianinas de aluminio y cinc<sup>78</sup>, porfirinas y sus derivados<sup>79-81</sup> y fenotiazinas, pasando por las evaluaciones <i>in vivo </i>, hasta finalizar en estudios piloto en humanos, se han observado amplias ventajas en la utilizaci&oacute;n de este procedimiento como alternativa prometedora en el tratamiento de la leishmaniasis cut&aacute;nea<sup>82</sup>. </p>     <p>Investigaciones con ftalocianinas de aluminio<sup>83</sup>, cloroaluminio y cinc, libres y encapsuladas en liposomas ultradeformables, han mostrado alta efectividad <i>in vitro </i>sobre promastigotes y amastigotes de <i>Leishmania </i>. En un estudio realizado por Hern&aacute;ndez et al. en 2012 que evalu&oacute; el efecto de las ftalocianinas de cloroaluminio en liposomas ultradeformables, sobre promastigotes y amastigotes intracelulares de <i>L. chagasi </i>y <i>L. amazonensis </i>infectando c&eacute;lulas THP-1, se observ&oacute; que el compuesto encapsulado tuvo una mayor efectividad sobre promastigotes frente al compuesto libre, aunque en amastigotes intracelulares no se apreciaron diferencias significativas<sup>84</sup>. Otro estudio que evalu&oacute; la actividad leishmanicida <i>in vitro </i>de ftalocianinas de cinc en liposomas ultradeformables sobre <i>L. braziliensis </i>mostr&oacute; 20% de actividad antipromastigote y antiamastigote, porcentaje bajo comparado con el resultado obtenido con la ftalocianina en su forma libre (100% de actividad antipromastigote y 80% de actividad antiamastigote). Sin embargo, la ftalocianina de cinc en liposomas ultradeformables exhibi&oacute; un nivel de penetraci&oacute;n m&aacute;s alto en el estrato c&oacute;rneo de la piel, frente al nivel observado con su forma libre, lo cual contempla, adem&aacute;s del papel leishmanicida del compuesto, el papel sin&eacute;rgico que este puede tener en profilaxis o en la terapia durante etapas tempranas de la infecci&oacute;n85. Finalmente una investigaci&oacute;n que evalu&oacute; el efecto en fototerapia de la fenotiazina y algunos derivados como el azul de toluidina O (TBO) y el azul de metileno (MB) sobre <i>L. braziliensis </i>en concentraciones de 5 y 10 mg/ml mostr&oacute; un descenso significativo en el n&uacute;mero de promastigotes viables en todos los grupos tratados frente a los grupos control, con mayor letalidad de todos los compuestos en concentraciones de 10 mg/ml<sup>86</sup>. </p>     <p>Los &uacute;ltimos estudios <i>in vivo </i>de fototerapia en leishmaniasis han evaluado la respuesta terap&eacute;utica en h&aacute;msteres infectados con <i>L. amazonensis </i>en planta de pata o en piel de dorso. Un grupo de h&aacute;msteres tratados con azul de metileno, como agente fotosensibilizador, una vez por semana durante tres semanas e irradiados con LED durante 1 hora, exhibieron una notable disminuci&oacute;n en la carga parasitaria en los n&oacute;dulos linf&aacute;ticos de la planta de la pata<sup>87</sup>. Otro estudi&oacute; evalu&oacute; la eficacia terap&eacute;utica en h&aacute;msteres infectados intrad&eacute;rmicamente en piel de dorso con <i>L. amazonensis </i>y tratados con Ketales de carbaporfirina. Se observ&oacute; actividad del compuesto incluso en la oscuridad, sugiriendo que el compuesto, una vez que se metaboliza en el tejido animal, produce un ingrediente activo que no parece ser fotosensible. Adicionalmente se observ&oacute; una considerable reducci&oacute;n del tama&ntilde;o de la lesi&oacute;n y los resultados del an&aacute;lisis histopatol&oacute;gico y del frotis confirmaron la eficacia <i>in vivo </i>del compuesto, ya que la carga parasitaria disminuy&oacute; notablemente sin efectos t&oacute;xicos asociados al tratamiento<sup>80</sup>. </p>     ]]></body>
<body><![CDATA[<p>En otro estudio se observ&oacute; que ratones Balb/c infectados en oreja con <i>L. major</i>, tratados 3 semanas post-infecci&oacute;n con soluci&oacute;n t&oacute;pica de ALA e irradiados 4 horas despu&eacute;s con una fluencia de 50 J/cm2, presentaron una notable disminuci&oacute;n en la carga parasitaria al comparar este grupo con el grupo control, tratado con ALA pero no iluminado y con un grupo solo irradiado sin aplicaci&oacute;n de ALA<sup>88</sup>. En estos ratones se observ&oacute; tambi&eacute;n una discreta necrosis en el &aacute;rea irradiada, acompa&ntilde;ada de da&ntilde;o vascular y un marcado proceso inflamatorio confirmado en el estudio histopatol&oacute;gico, que mostr&oacute; edema acompa&ntilde;ado de destrucci&oacute;n de fibras de col&aacute;geno, congesti&oacute;n vascular, espongiosis, infiltraci&oacute;n de neutr&oacute;filos, entre otro muchos hallazgos, compatibles con este proceso y acompa&ntilde;ado adem&aacute;s de una notable disminuci&oacute;n de los macr&oacute;fagos, c&eacute;lula hospedera por excelencia del par&aacute;sito y cuya disminuci&oacute;n es directamente proporcional a la destrucci&oacute;n de los par&aacute;sitos y al aumento de citosinas proinflamatorias como la IL-6. En este estudio adem&aacute;s se demostr&oacute; que, a diferencia de lo observado in <i>vivo </i>, en el modelo <i>in vitro </i>con c&eacute;lulas J774 no hubo una disminuci&oacute;n significativa de estas c&eacute;lulas que almacenaron la cantidad suficiente del compuesto para ser destruidas, lo cual indica que efectivamente la disminuci&oacute;n en la carga parasitaria est&aacute; relacionada no solo con el da&ntilde;o directo sobre la c&eacute;lula blanco y el par&aacute;sito, sino que forma parte de un complejo proceso que involucra la respuesta inmune, el sistema vascular y el tipo de &oacute;rgano o tejido. </p>     <p>Otro estudio de este mismo autor<sup>89</sup> evalu&oacute; el efecto de las fenotiazinas bajo condiciones similares a las descritas anteriormente y en el mismo modelo de infecci&oacute;n. Se obtuvieron resultados que demostraron la eficacia de estos compuestos en los ratones infectados, con una inmunomodulaci&oacute;n dependiente de la dosis. El resultado cosm&eacute;tico final fue favorable y por ello el autor propone la terapia fotodin&aacute;mica como una alternativa terap&eacute;utica eficaz para el tratamiento de la leishmaniasis cut&aacute;nea. <i>In vitro </i>se observ&oacute; que el compuesto fue efectivo sobre los promastigotes a concentraciones de 0,093 &micro;M, mientras que las J774 infectadas y tratadas con 1,25 &micro;M de EtNBS fueron destruidas y liberaron par&aacute;sitos a&uacute;n vivos, debido posiblemente a una cantidad insuficiente del compuesto para la eliminaci&oacute;n completa de los par&aacute;sitos. </p>     <p>En cuanto a los estudios realizados en humanos, se ha demostrado que pacientes tratados con ALA<sup>90</sup> y metvix&reg;<sup>91-93</sup> tienen una r&aacute;pida y total curaci&oacute;n de la lesi&oacute;n, con cicatrizaci&oacute;n completa y notable atenuaci&oacute;n de la marca dejada por los tratamientos previos. Igualmente se ha comparado la efectividad de la fototerapia frente a los tratamientos convencionales actuales aceptados por la Organizaci&oacute;n Mundial de la Salud (OMS) tales como el antimonio pentavalente, la paramomicina, la anfotericina B y la miltefosina<sup>94-97</sup> y frente a otros procedimientos como la crioterapia, la pentamidina y la termoterapia98-100, con resultados similares en cuanto a eficacia terap&eacute;utica, pero con una clara ventaja en cuanto al sorprendente efecto cosm&eacute;tico de la fototerapia. </p>     <p>En la <a href="#tabla2">tabla 2</a> se resume los estudios con fototerapia dirigidos al tratamiento de la leishmaniasis cut&aacute;nea. </p>     <p>    <center>   <a name="tabla2"><img src="img/revistas/inf/v17n2/v17n2a07t2.gif"></a></center> </p>     <p>    <center>   <a name="tabla1"><img src="img/revistas/inf/v17n2/v17n2a07t2b.gif"></a></center> </p>     <p><b>Perspectivas con la hipericina en fototerapia para el tratamiento de la leishmaniasis cut&aacute;nea </b></p>     <p>Los datos actuales indican que la fototerapia es una alternativa terap&eacute;utica bien tolerada y una opci&oacute;n segura de tratamiento para la leishmaniasis cut&aacute;nea, con eficacia superior a los tratamientos convencionales. La b&uacute;squeda de nuevos agentes fotosensibilizadores ha permitido extender la investigaci&oacute;n al campo de las plantas fotot&oacute;xicas, con mol&eacute;culas bioactivas que muestran tener un importante potencial en fototerapia, entre las cuales resalta la hipericina. </p>     ]]></body>
<body><![CDATA[<p>Como se dijo antes, esta biomol&eacute;cula presenta un rendimiento cu&aacute;ntico alto en su estado triplete y genera eficientemente ox&iacute;geno singlete y aniones super&oacute;xido <sup>101-103</sup>. Diversos estudios han revelado la multifac&eacute;tica actividad fotodin&aacute;mica de la hipericina, bien sea con la inducci&oacute;n de la peroxidaci&oacute;n de membranas lip&iacute;dicas<sup>56</sup>, aumento en la actividad super&oacute;xido dismutasa e incremento de los niveles de glutati&oacute;n<sup>57,58</sup>, lo cual le otorga importantes propiedades antitumorales, antimicrobianas y espec&iacute;ficamente leishmanicidas, por lo que se piensa en este metabolito de <i>Hypericum perforatum </i>como un agente promisorio contra el par&aacute;sito al ser aplicado en los tejidos infectados<sup>104</sup>. </p>     <p>De acuerdo a todo lo anterior, se hace necesario realizar estudios tanto <i>in vitro </i>como <i>in vivo </i>, que est&eacute;n dirigidos a validar el potencial terap&eacute;utico de la fotoactividad de la hipericina en leishmaniasis cut&aacute;nea, con el fin de dirigir posteriores esfuerzos a la realizaci&oacute;n de evaluaciones cl&iacute;nicas que permitan postular esta mol&eacute;cula como un nuevo tratamiento en esta enfermedad. </p>     <p><b>Conflicto de intereses </b></p>     <p>Los autores declaran no tener ning&uacute;n conflicto de intereses. </p>     <p><b>Agradecimientos </b></p>     <p>Al Instituto Tecnol&oacute;gico Metropolitano, la Universidad de Santander Sede C&uacute;cuta y la Universidad de Caldas. </p>     <p>* Autor para correspondencia. </p>     <p><i>Correo electr&oacute;nico: </i>vivianataylor@gmail.com (V.M. Taylor O.). </p>     <p>0123-9392/$ - see front matter &copy; 2013 ACIN. Publicado por Elsevier Espa&ntilde;a, S.L. Todos los derechos reservados. </p>     <p><b>Bibliograf&iacute;a </b></p>     ]]></body>
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