<?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>1870-0195</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias farmacéuticas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. farm]]></abbrev-journal-title>
<issn>1870-0195</issn>
<publisher>
<publisher-name><![CDATA[Asociación Farmacéutica Mexicana A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-01952011000300003</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Citroflavonoides como posible alternativa en el tratamiento de la diabetes y sus complicaciones]]></article-title>
<article-title xml:lang="en"><![CDATA[Citroflavonoids as an alternative for the treatment of diabetes and its complications]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Sánchez]]></surname>
<given-names><![CDATA[Avel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cabañas-Wuan]]></surname>
<given-names><![CDATA[Ángel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arana-Argáez]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Núñez]]></surname>
<given-names><![CDATA[Emanuel]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-Andrade]]></surname>
<given-names><![CDATA[Rolffy]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Yucatán Facultad de Química Laboratorio de Farmacología]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Yucatán Facultad de Química Laboratorio de Espectrometría de Masas]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2011</year>
</pub-date>
<volume>42</volume>
<numero>3</numero>
<fpage>17</fpage>
<lpage>26</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-01952011000300003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-01952011000300003&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-01952011000300003&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los flavonoides constituyen una de las subfamilias de polifenoles naturales, a las que la comunidad científica ha dedicado más atención en los últimos años, principalmente por sus efectos antioxidantes. Debido a su gran diversidad estructural, abundancia en la naturaleza, su demostrada ubicuidad y sus múltiples propiedades farmacológicas observadas experimentalmente, junto con su amplia presencia en numerosos remedios de la medicina tradicional, representan una importante alternativa terapéutica para el descubrimiento de nuevos agentes farmacológicos para el tratamiento de enfermedades crónicas de elevada prevalencia como es el caso de la diabetes mellitus.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Flavonoids represent natural polyphenols subfamilies, which the scientific community has devoted more attention in recent years, principally for its antioxidant properties. Because of their structural diversity, abundance in nature, demonstrated ubiquity and pharmacological properties observed in experimentation, besides their wide presence in traditional medicine, represent an important therapeutic alternative in the discovery of new pharmacological agents, for the treatment of chronic diseases, as in the case of diabetes mellitus.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[diabetes mellitus]]></kwd>
<kwd lng="es"><![CDATA[flavonoides]]></kwd>
<kwd lng="es"><![CDATA[antioxidantes]]></kwd>
<kwd lng="en"><![CDATA[diabetes mellitus]]></kwd>
<kwd lng="en"><![CDATA[flavonoids]]></kwd>
<kwd lng="en"><![CDATA[antioxidants]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Revisiones bibliogr&aacute;ficas</font></p>     <p align="justify">&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Citroflavonoides como posible alternativa en el tratamiento de la diabetes y sus complicaciones</b></font></p>     <p align="center">&nbsp;</p>      <p align="center"><font face="verdana" size="3"><b>Citroflavonoids as an alternative for the treatment of diabetes and its complications</b></font></p>     <p align="center">&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>Gonz&aacute;lez&#45;S&aacute;nchez Avel,<sup>1</sup> Caba&ntilde;as&#45;Wuan &Aacute;ngel, <sup>1</sup> Arana&#45;Arg&aacute;ez V&iacute;ctor,<sup>1</sup> Hern&aacute;ndez&#45;N&uacute;&ntilde;ez Emanuel,<sup>2</sup> Ortiz&#45;Andrade Rolffy<sup>1</sup></b></font></p>     <p align="center">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><sup><i>1 </i></sup><i>Laboratorio de Farmacolog&iacute;a, <font face="verdana" size="2">Facultad de Qu&iacute;mica, Universidad Aut&oacute;noma de Yucat&aacute;n.</font></i></font></p>     <p align="justify"><i><font face="verdana" size="2"> <sup>2 </sup>Laboratorio de Espectrometr&iacute;a de Masas, Facultad de Qu&iacute;mica, Universidad Aut&oacute;noma de Yucat&aacute;n.</font></i></p>     ]]></body>
<body><![CDATA[<p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Correspondencia&nbsp;</b></font></p>     <p align="justify"><font face="verdana" size="2"><i>Dr. Rolffy Rub&eacute;n Ortiz Andrade    <br> Laboratorio de Farmacolog&iacute;a, Facultad de Qu&iacute;mica,    <br> Universidad Aut&oacute;noma de Yucat&aacute;n    <br> Calle 41 No. 421 x 26 y 28, Col. Industrial,    <br> CP 97150, M&eacute;rida, Yucat&aacute;n, M&eacute;xico    <br> Tel: (99) 99225711, Ext. 119    <br>  e&#45;mail:</i> <a href="mailto:rolffy.ortiz@uady.mx">rolffy.ortiz@uady.mx</a></font></p>     <p align="justify">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Fecha de recepci&oacute;n: 31 de mayo de 2011.    <br> Fecha de recepci&oacute;n de modificaci&oacute;n: 22 de junio de 2011.     <br> Fecha de aceptaci&oacute;n: 9 de agosto de 2011.</font></p>     <p align="justify">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los flavonoides constituyen una de las subfamilias de polifenoles naturales, a las que la comunidad cient&iacute;fica ha dedicado m&aacute;s atenci&oacute;n en los &uacute;ltimos a&ntilde;os, principalmente por sus efectos antioxidantes. Debido a su gran diversidad estructural, abundancia en la naturaleza, su demostrada ubicuidad y sus m&uacute;ltiples propiedades farmacol&oacute;gicas observadas experimentalmente, junto con su amplia presencia en numerosos remedios de la medicina tradicional, representan una importante alternativa terap&eacute;utica para el descubrimiento de nuevos agentes farmacol&oacute;gicos para el tratamiento de enfermedades cr&oacute;nicas de elevada prevalencia como es el caso de la diabetes mellitus.</font></p> 	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> diabetes mellitus, flavonoides, antioxidantes.</font></p>     <p align="justify">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Flavonoids represent natural polyphenols subfamilies, which the scientific community has devoted more attention in recent years, principally for its antioxidant properties. Because of their structural diversity, abundance in nature, demonstrated ubiquity and pharmacological properties observed in experimentation, besides their wide presence in traditional medicine, represent an important therapeutic alternative in the discovery of new pharmacological agents, for the treatment of chronic diseases, as in the case of diabetes mellitus.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Key words:</b> diabetes mellitus, flavonoids, antioxidants.</font></p>  	    <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Introducci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En 1930, Rusznyak y Szent&#45;Gy&ouml;rgy aislaron un nuevo compuesto a partir de la naranja dulce <i>(Citrus sinensis),</i> al cual denominaron Vitamina P.<sup>1</sup> Actualmente, dicha sustancia se conoce como flavonoide. Desde aquel entonces, estos compuestos han llamado la atenci&oacute;n de muchos investigadores, sobre todo, con el descubrimiento de la llamada "Paradoja Francesa",<sup>2</sup> fen&oacute;meno asociado al consumo de vino tinto, fuente importante de flavonoides.<sup>3</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En cuanto a su estructura qu&iacute;mica, los flavonoides representan un grupo de compuestos polifen&oacute;licos que poseen un n&uacute;cleo b&aacute;sico de flavano con dos anillos arom&aacute;ticos (A y B), los cuales se encuentran interconectados por un anillo heteroc&iacute;clico de tres &aacute;tomos de carbono (anillo C), el cual a su vez, puede estar unido al anillo B en C&#45;2 (flavona), en C&#45;3 (isoflavona) o en C&#45;4 (neoflavona). Debido a la diversidad de modificaciones que pueden presentarse en los tres anillos, principalmente el C&#45;2, los flavonoides representan uno de los grupos m&aacute;s amplios de compuestos, as&iacute; como tambi&eacute;n la clase m&aacute;s diversa de metabolitos secundarios en plantas.4 Prueba de ello es que a la fecha se han identificado m&aacute;s de 4,000 flavonoides en frutas, vegetales, granos, cortezas, ra&iacute;ces, tallos y flores, as&iacute; como en el t&eacute; verde y en el vino (<a href="#f1">figura 1</a>).<sup>5,6</sup></font></p> 	    <p align="center"><a name="f1"></a></p> 	    <p align="center"><img src="/img/revistas/rmcf/v42n3/a3f1.jpg"></p>      <p align="justify"><font face="verdana" size="2">El creciente inter&eacute;s en los flavonoides se debe principalmente a su amplia actividad farmacol&oacute;gica y a sus importantes efectos antioxidantes. Adem&aacute;s, presentan una gran variedad de propiedades entre las que se destacan el impacto sobre la regulaci&oacute;n del crecimiento celular y la inducci&oacute;n de enzimas de destoxificaci&oacute;n como las monooxigenasas dependientes del citocromo P&#45;450. Asimismo, se ha comprobado su potente capacidad de inhibici&oacute;n <i>in vitro</i> de la oxidaci&oacute;n de las lipoprote&iacute;nas de baja densidad (LDL) por los macr&oacute;fagos y reducir la citotoxicidad de las LDL oxidasas. Por otra parte, pueden unirse a los pol&iacute;meros biol&oacute;gicos como: enzimas, transportadores de hormonas y ADN; formar quelatos con iones met&aacute;licos transitorios tales como Fe<sup>2+</sup>, Cu<sup>2+</sup>, Zn<sup>2+</sup>; catalizar el transporte de electrones y depurar radicales libres. Es por ello que, debido a este hecho, se han descrito efectos protectores en patolog&iacute;as tales como DM, c&aacute;ncer, cardiopat&iacute;as, infecciones v&iacute;ricas, &uacute;lcera estomacal y duodenal, e inflamaciones.<sup>7&#45;9</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Presencia de los flavonoides en la naturaleza</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los flavonoides se encuentran ampliamente distribuidos en el reino vegetal, encontr&aacute;ndose en frutas, verduras, semillas y flores, as&iacute; como en productos como la cerveza, vino, t&eacute; verde, t&eacute; negro y soya.<sup>10,11</sup></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En nuestra cultura nutrimental contamos con alimentos ricos en flavonoides tales como: la fresa, naranja &aacute;cida, uvas negras, toronjas, espinacas, remolacha, pimientos, cebolla, aguacate, berenjena, pl&aacute;tano, br&oacute;coli y coliflor, entre una lista bastante extensa.<sup>10</sup> Los principales flavonoides presentes en la dieta humana se presentan en la <a href="#t1">tabla 1</a>.<sup>1,2</sup></font></p> 	    <p align="center"><a name="t1"></a></p> 	    <p align="center"><img src="/img/revistas/rmcf/v42n3/a3t1.jpg"></p>     <p align="justify"><font face="verdana" size="2"><b>Caracter&iacute;sticas estructurales de los citroflavonoides</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los flavonoides comprenden un grupo de compuestos polifen&oacute;licos ampliamente distribuidos en la naturaleza. Existen 13 subclases de flavonoides con m&aacute;s de 5,000 compuestos, todos presentando un esqueleto hidrocarbonado del tipo C<sub>6</sub>&#45;C<sub>3</sub>&#45;C<sub>6</sub> derivado del &aacute;cido shik&iacute;mico y de tres residuos de acetato.<sup>13&#45;15</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Las plantas del g&eacute;nero <i>Citrus</i> se caracterizan por producir un amplio rango de constituyentes flavonoides, principalmente los del tipo flavanona, flavona y del tipo flavona polimetoxiladas tanto en la porci&oacute;n del flavedo (epicarpio) como en el albedo (tejido blanco esponjoso) (<a href="#c1">Cuadro 1</a>).<sup>16</sup></font></p> 	    <p align="center"><a name="c1"></a></p> 	    <p align="center"><img src="/img/revistas/rmcf/v42n3/a3c1.jpg"></p>     <p align="justify"><font face="verdana" size="2"><b>Actividades biol&oacute;gicas y farmacol&oacute;gicas de los citroflavonoides</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los flavonoides han presentado diversas actividades biol&oacute;gicas y farmacol&oacute;gicas a nivel experimental, entre las que se destacan: antioxidante,<sup>16</sup> antitumoral,<sup>17,18</sup> antiviral anti&#45;H1N1,<sup>19</sup> tripanomicida y lehismanicida,<sup>20,21</sup> en cuanto a las actividades farmacol&oacute;gicas se han reportado: antidiab&eacute;tica, hipoglucemiante y antihiperglucemiante,<sup>22&#45;24</sup> antiinflamatoria,<sup>25</sup> antitromb&oacute;tica,<sup>25</sup> hepatoprotectora,<sup>26&#45;29</sup> ansiol&iacute;tica y anticonvulsivante,<sup>30,31</sup> antiamiloidog&eacute;nica,<sup>32</sup> neuroprotectora,<sup>33</sup> antilipid&eacute;mica,<sup>34,35</sup> y antihipertensiva.<sup>36,37</sup> Por otra parte, han demostrado experimentalmente la inhibici&oacute;n de enzimas como la topoisomerasa IV,<sup>38</sup> xantina oxidasa,<sup>39</sup> aldosa reductasa,<sup>40</sup> &alpha;&#45;glucosidasa y amilasa<sup>24</sup> transcriptasa inversa del virus de inmunodeficiencia humana (VIH),<sup>41</sup> prote&iacute;na quinasa C,<sup>42</sup> tirosina quinasa,<sup>43</sup> calmodulina,<sup>44</sup> hexoquinasa,<sup>45</sup> glucosa&#45;6&#45;fosfatasa,<sup>46</sup> fosfolipasa A<sub>2</sub><sup>47</sup> y 11&beta;&#45;hidroxiesteroide deshidrogenasa tipo I,<sup>48</sup> s&oacute;lo por mencionar algunas.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Diabetes mellitus</b></font></p>      <p align="justify"><font face="verdana" size="2">La Asociaci&oacute;n Americana de Diabetes (ADA, por sus siglas en ingl&eacute;s), define a la Diabetes Mellitus (DM) como un grupo de enfermedades, caracterizada por hiperglucemia, la cual es resultado de un defecto en la secreci&oacute;n y/o acci&oacute;n de la insulina. Esta hiperglucemia cr&oacute;nica se asocia al da&ntilde;o pancre&aacute;tico a largo plazo, defunci&oacute;n y/o fallo de diferentes &oacute;rganos, especialmente ojos, ri&ntilde;ones, nervios, coraz&oacute;n as&iacute; como de venas y arterias.<sup>49</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">La fisiopatolog&iacute;a de la DM se relaciona con dos eventos perfectamente identificables: 1) la destrucci&oacute;n autoinmune de las c&eacute;lulas &beta;&#45;pancre&aacute;ticas con la consecuente deficiencia en la secreci&oacute;n de insulina, y 2) la deficiente acci&oacute;n de la misma sobre los tejidos perif&eacute;ricos, o bien, un efecto combinado de estas dos caracter&iacute;sticas. La base de las anormalidades en el metabolismo de carbohidratos, l&iacute;pidos y prote&iacute;nas en la Diabetes Mellitus tipo 2 (DM2) es aceptada como evento primario en el desarrollo de la resistencia a la insulina en los tejidos perif&eacute;ricos y como evento secundario a los defectos asociados a una carencia relativa de secreci&oacute;n de dicha hormona. La secreci&oacute;n inadecuada de insulina, as&iacute; como, los defectos en la acci&oacute;n de la misma, com&uacute;nmente coexisten en el mismo paciente, y frecuentemente no est&aacute; claro, si una o ambas, son la causa primaria de la hiperglicemia (<a href="/img/revistas/rmcf/v42n3/a3f2.jpg" target="_blank">Figura 2</a>).<sup>49,50&#45;</sup><sup>5</sup></font></p>     <p align="justify"><font face="verdana" size="2"><b>Terapia farmacol&oacute;gica de la DM</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En individuos con DM2, una terapia com&uacute;n comienza con un esquema diet&eacute;tico con consumo bajo en carbohidratos y ejercicio, seguido de agentes antidiab&eacute;ticos orales (ADO's), estos &uacute;ltimos se usan cuando no es posible alcanzar un adecuado control tras un periodo razonable de intervenci&oacute;n en los h&aacute;bitos y estilo de vida. Estos f&aacute;rmacos est&aacute;n representados por cinco familias distribuidos en tres grupos farmacol&oacute;gicamente bien definidos, y ejercen su efecto sobre diferentes factores fisiopatol&oacute;gicos que contribuyen al desarrollo de la enfermedad. Por otro lado, la terapia con insulina ha sido considerada como la &uacute;ltima opci&oacute;n terap&eacute;utica cuando la dieta, el ejercicio y los ADO's orales han fallado en el control gluc&eacute;mico (<a href="/img/revistas/rmcf/v42n3/a3f3.jpg" target="_blank">Figura 3</a>).<sup>55&#45;</sup><sup>66</sup></font></p>     <p align="justify"><font face="verdana" size="2">a)&nbsp;Secretagogos de insulina</font></p>  	    <p align="justify"><font face="verdana" size="2">Son agentes que incrementan la secreci&oacute;n de insulina en las c&eacute;lulas &beta;&#45;pancre&aacute;ticas mediante bloqueo de los canales de potasio sensibles a ATP (KATP), a trav&eacute;s de la uni&oacute;n a receptores espec&iacute;ficos a estos canales. Se encuentran disponibles agentes tanto de acci&oacute;n r&aacute;pida como acci&oacute;n lenta. Los dos principales grupos de secretagogos de insulina empleados son:<sup>55&#45;60</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&bull;&nbsp;Sulfonilureas (SU, por ejemplo glibenclamida)</font></p>  	    <p align="justify"><font face="verdana" size="2">&bull;&nbsp;Meglitinidas (MG, por ejemplo repaglinida)</font></p>  	    <p align="justify"><font face="verdana" size="2">b)&nbsp;Antihiperglucemiantes</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Son f&aacute;rmacos que impiden el aumento de los niveles plasm&aacute;ticos de glucosa, inhibiendo competitivamente a enzimas que se encuentran en el borde en cepillo del intestino delgado, las cuales son responsables de la hidr&oacute;lisis de oligosac&aacute;ridos y disac&aacute;ridos a monosac&aacute;ridos, m&aacute;s f&aacute;ciles de absorber, por lo que se retrasa la entrada de la glucosa a la circulaci&oacute;n sist&eacute;mica y disminuye los niveles postprandiales de glucosa.<sup>55&#45;60</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&bull;&nbsp;Inhibidores de las &alpha;&#45;glucosidasas intestinales (IAG, por ejemplo acarbosa y miglitol)</font></p>  	    <p align="justify"><font face="verdana" size="2">c)&nbsp;Sensibilizadores de insulina</font></p>  	    <p align="justify"><font face="verdana" size="2">Estos agentes incrementan la sensibilidad del m&uacute;sculo e h&iacute;gado hacia la insulina. Dependiendo de la clase de f&aacute;rmaco que se trate, incrementar&aacute; la sensibili dad a la insulina por un mecanismo diferente y tendr&aacute; su efecto primario, igualmente, en diferentes tejidos. <sup>55&#45;60</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&bull;&nbsp;Biguanidas (por ejemplo metformina). Act&uacute;an disminuyendo la producci&oacute;n hep&aacute;tica de glucosa e incrementando la captaci&oacute;n de la misma por el m&uacute;sculo esquel&eacute;tico, mediante la activaci&oacute;n de la Adenosina Monofosfato Protein Kinasa Activada (AMPK) hep&aacute;tica y muscular, que a su vez inhibe la lipog&eacute;nesis y activa la &beta;&#45;oxidaci&oacute;n.<sup>55&#45;60</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&bull;&nbsp;Tiazolidinedionas (TZD, por ejemplo rosiglitazona). Son f&aacute;rmacos agonistas de los Receptores Activadores de Proliferaci&oacute;n de Peroxisomas Gamma (PPAR&#45;<i>&gamma;</i>, por sus siglas en ingl&eacute;s), que al activarse se unen a elementos de respuesta de ADN, alterando la transcripci&oacute;n de genes que regulan el metabolismo de carbohidratos y l&iacute;pidos. Su efecto m&aacute;s importante es la estimulaci&oacute;n e incremento en la captaci&oacute;n de insulina por c&eacute;lulas del m&uacute;sculo esquel&eacute;tico. Estos agentes disminuyen la resistencia a insulina en los tejidos perif&eacute;ricos, as&iacute; como la producci&oacute;n hep&aacute;tica de glucosa. <sup>55&#45;60</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Una nueva clase de agentes farmacol&oacute;gicos con efecto antidiab&eacute;tico que se han desarrollado para el tratamiento de la diabetes mellitus, son:</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>1. Mim&eacute;ticos de incretinas</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Son un grupo de agentes farmacol&oacute;gicos que imitan algunos efectos end&oacute;genos de hormonas incret&iacute;nicas, incluyendo la mejor secreci&oacute;n de insulina glucosa&#45;dependiente; aunque exhiben efectos glucorregulatorios similares a los del p&eacute;ptido similar al Glucag&oacute;n&#45;1 (GLP&#45;1, por sus siglas en ingl&eacute;s), sus acciones no son directamente mediadas solamente por el receptor GLP&#45;1.<sup>61&#45;63</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&bull;&nbsp;An&aacute;logos del GLP&#45;1, por ejemplo exenatida y liraglutida</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&bull;&nbsp;An&aacute;logos de la amilina, por ejemplo pramlintide</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>2. Inhibidores de la dipeptidil&#45;peptidasa IV (DPP&#45;IV)</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Inhiben la acci&oacute;n de esta enzima e impiden la degradaci&oacute;n de una variedad de p&eacute;ptidos, incluyendo al GLP&#45;1, y por lo tanto aumentando su concentraci&oacute;n plasm&aacute;tica as&iacute; como su periodo de acci&oacute;n.<sup>62&#45;64</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&bull;&nbsp;Vildagliptina, sitagliptina y saxagliptina</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>3.Inhibidores del cotransportador dependiente de sodio y glucosa tipo 2 (SGLT&#45;2)</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Inhiben este cotransportador, impidiendo la reabsorci&oacute;n de glucosa produciendo glucosuria, disminuyendo as&iacute; los niveles plasm&aacute;ticos de glucosa. Estos f&aacute;rmacos a&uacute;n se encuentran en fase de investigaci&oacute;n cl&iacute;nica III.<sup>65&#45;72</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&bull;&nbsp;Dapagliflozina, remogliflozina y sergliflozina</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Flavonoides como una alternativa terap&eacute;utica de enfermedades cr&oacute;nicas</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Numerosos grupos de investigaci&oacute;n han demostrado que los flavonoides presentan diversas actividades sobre la maquinaria metab&oacute;lica de diferentes c&eacute;lulas humanas, dichos experimentos han evidenciado efectos tanto <i>in vitro</i> como <i>in vivo</i> que pudiesen hacer sospechar que estos metabolitos secundarios representen una alternativa terap&eacute;utica para la regulaci&oacute;n de padecimientos que comprometan procesos metab&oacute;licos en las c&eacute;lulas, tal es el caso de los padecimientos de tipo cr&oacute;nico degenerativos c&oacute;mo la diabetes, la hipertensi&oacute;n y el c&aacute;ncer.</font></p>  	    <p align="justify"><font face="verdana" size="2">Debido a la gran diversidad estructural de estos compuestos, su abundancia en la naturaleza y demostrada ubicuidad, los flavonoides representan una importante alternativa para el descubrimiento de nuevos agentes antidiab&eacute;ticos. Es por ello que en la actualidad diversos grupos de investigaci&oacute;n a nivel mundial intensifican la b&uacute;squeda de fuentes alternativas para la obtenci&oacute;n de compuestos de tipo flavonoide. Una de estas importantes fuentes hasta ahora olvidada, son los flavonoides derivados de los desechos de plantas c&iacute;tricas denominados citroflavonoides.<sup>73</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Citroflavonoides y diabetes mellitus</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los citroflavonoides han sido ampliamente estudiados desde diferentes puntos de vista, entre ellos destacan los que se encuentran de manera m&aacute;s abundante en los c&iacute;tricos como hesperidina, naringina, rutina y diosmina. Estos citroflavonoides presentan evidencias de efectos hipoglucemiantes, antihiperglic&eacute;micos y/antidiab&eacute;ticos tanto en ensayos <i>in vivo</i> como <i>in vitro.</i> Los flavonoides m&aacute;s estudiados son: hesperidina, diosmina, naringenina y rutina, los cuales se describen a continuaci&oacute;n seg&uacute;n sus evaluaciones biol&oacute;gicas y farmacol&oacute;gicas relacionadas con sus efectos antidiab&eacute;ticos.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Hesperidina</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La hesperidina es el flavonoide que por su abundancia en el g&eacute;nero <i>Citrus</i> representa la mol&eacute;cula con mayor importancia dentro de este grupo. En cuanto a los efectos sobre la homeostasis de glucosa. Lee y colaboradores (2004) sugieren que la hesperidina juega un papel importante en la prevenci&oacute;n de la hiperglicemia, evidenciado por el aumento de la gluc&oacute;lisis y la concentraci&oacute;n de gluc&oacute;geno hep&aacute;tico semejante a lo ocasionado por f&aacute;rmacos antihipergluc&eacute;micos c&oacute;mo la metformina y fenformina.<sup>23</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Por otro lado, Uehara y colaboradores (2010) reportan que una dieta de esta flavona (10 mg/kg) reduce los niveles de glucosa sangu&iacute;nea, mediante la alteraci&oacute;n de las enzimas reguladoras de glucosa (glucosa cinasa y glucosa&#45;6&#45;fosfatasa), en modelos de DM1 y DM2. EKakadiya y Shah (2010) demostraron que la hesperidina, redujo significativamente los niveles de glucosa sangu&iacute;nea, HbA<sub>1c</sub> y gluc&oacute;geno.<sup>74,75</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Estos resultados demuestran los efectos hipoglucemiantes de la hesperidina, sin embargo, es necesario el esclarecimiento del modo de acci&oacute;n por el cual se ejercen estos efectos ben&eacute;ficos sobre la homeostasis de glucosa.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Diosmina</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La diosmina es una flavanona presente en los c&iacute;tricos en proporci&oacute;n 9:1 con respecto a la hesperidina. En un estudio realizado por pari y srinivasan (2010) en un modelo de DM2, se demostr&oacute; su actividad antihipergluc&eacute;mica al observar la reducci&oacute;n de los niveles de glucosa plasm&aacute;tica dosis dependiente. Adicionalmente, se evidenci&oacute; su efecto sobre el metabolismo hep&aacute;tico al incrementar la actividad de la hexoquinasa y la glucosa&#45;6&#45;fosfato deshidrogenasa, y disminuir la actividad de la glucosa&#45;6&#45;fosfatasa y la fructosa&#45;1,6&#45;bifosfatasa. Finalmente, en otro estudio se demostr&oacute; que la administraci&oacute;n oral de diosmina en dosis de 100 mg/kg redujo los niveles de HbA<sub>1c</sub> e incremento la insulina en plasma. Estos resultados confirman los efectos antihiperglic&eacute;micos e hipoglucemiantes de la diosmina.<sup>76</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Naringenina</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La naringenina es la flavona que al glicosilarse da origen a la quercetina. Se ha reportado que dicha aglicona incrementa la captaci&oacute;n de glucosa por las c&eacute;lulas del m&uacute;sculo esquel&eacute;tico de forma dependiente de AMP<sub>C</sub> seg&uacute;n los hallazgos de Zygmunt y 22 cols. (2010). Estos efectos hacen sospechar que la naringenina presenta un comportamiento similar a la insulina, al no incrementar la captaci&oacute;n de glucosa en los mioblastos, indicando que en el mecanismo de acci&oacute;n de este flavonoide, los transportadores de glucosa dependientes de insulina (GLUT4) podr&iacute;an estar involucrados.<sup>77</sup></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Por otro lado, Purushotham, Tian y Belury, evaluaron en un bioensayo <i>in vitro</i> con c&eacute;lulas FaO (productoras de glucosa a partir de precursores no glucos&iacute;dicos), observando que la presencia de naringenina en el medio de cultivo ocasion&oacute; una potente inhibici&oacute;n de la producci&oacute;n de glucosa hep&aacute;tica, efecto similar al que ejercen los antidiab&eacute;ticos orales del tipo biguanida.<sup>78</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En cuanto a los efectos <i>in vivo,</i> Ortiz&#45;Andrade y cols. demostraron que la naringenina induce una supresi&oacute;n en el incremento de glucosa plasm&aacute;tica en ratas normogluc&eacute;micas y diab&eacute;ticas, en periodos agudos y subcr&oacute;nicos de administraci&oacute;n. Estos resultados sugieren que el efecto antidiab&eacute;tico ocasionado por la naringenina es llevado a cabo por v&iacute;a extrapancre&aacute;tica, particularmente por una posible supresi&oacute;n en la absorci&oacute;n de carbohidratos a nivel intestinal, lo que reduce el incremento de los niveles postprandiales de glucosa sangu&iacute;nea.<sup>79</sup> Esta aseveraci&oacute;n es reforzada con lo descrito por Li y cols., donde se demuestra que la naringenina inhibe la captaci&oacute;n de glucosa en el borde del cepillo intestinal y renal de ratas diab&eacute;ticas, en un modelo <i>in vitro.</i> Esta inhibici&oacute;n, explica al menos en parte, la actividad antihiperglucemiante de la naringenina en experimentos <i>in vivo,</i> relacion&aacute;ndolo principalmente con una inhibici&oacute;n de los cotransportadores sodio&#45;glucosa (SGLT).<sup>80</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Otros grupos de investigaci&oacute;n tambi&eacute;n han demostrado que la naringenina est&aacute; implicada en la modulaci&oacute;n del metabolismo de carbohidratos al inhibir la actividad enzim&aacute;tica de la fructosa&#45;1,6&#45;bifosfatasa y la glucosa&#45;6&#45;fosfatasa, prote&iacute;nas importantes en la gluconeog&eacute;nesis. Adem&aacute;s, Rayidi y cois, sugieren que este efecto es llevado a cabo a trav&eacute;s de la regulaci&oacute;n del AMPc o cualquier otro metabolito regulador de la gluconeog&eacute;nesis. De la misma forma, naringenina produjo un aumento de la actividad de la hexoquinasa, lo que tambi&eacute;n indica un incremento en la absorci&oacute;n de glucosa por los hepatocitos y un aumento de la glic&oacute;lisis ocasionado por &eacute;sta flavona.<sup>81</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Los flavonoides presentes en las especies vegetales se encuentran principalmente como glic&oacute;sidos. Sin embargo, existen reportes en la literatura cient&iacute;fica que describen que dichos compuestos son los menos bioactivos. Esto indica que el flavonoide en forma libre (aglicona) son la forma bioactiva de este grupo de metabolitos secundarios, los cuales son principalmente absorbidos por difusi&oacute;n pasiva.<sup>82</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Por otro lado, se plantea que los glic&oacute;sidos podr&iacute;an ser modificados (desglicosilados) al ingresar por v&iacute;a oral al organismo mediante las enzimas del tracto gastrointestinal, o bien, por la flora normal que ah&iacute; habita. Por lo que, la actividad farmacol&oacute;gica desencadenada en el organismo, ser&aacute; ocasionada por la correspondiente aglicona. Posteriormente, los flavonoides al ser absorbidos pueden metabolizados en el enterocito y en el h&iacute;gado para ser finalmente excretados. Es por ello, que en el presente art&iacute;culo se hace menci&oacute;n de dos gluc&oacute;sidos de flavonoide que dan origen a agliconas que han sido objeto de amplios estudios farmacol&oacute;gicos encaminados a la b&uacute;squeda y esclarecimiento de sus efectos beneficios sobre la homeostasis de glucosa en el organismo, tal es el caso de la naringina y la rutina, gluc&oacute;sidos de naringenina y quercetina respectivamente.<sup>82</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Naringina</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Lee y colaboradores (2004) han descrito que la flavanona naringina presenta actividad antihiperglucemiante al ser avaluada en ratones diab&eacute;ticos C57BL/KsJ&#45;db/db, reduciendo los niveles de glucosa en sangre, a trav&eacute;s de la disminuci&oacute;n de la actividad de las enzimas hep&aacute;ticas glucosa&#45;6&#45;fosfatasa, fosfoenolpiruvato carboxicinasa y glucocinasa hep&aacute;tica (precursores de la gluconeog&eacute;nesis). As&iacute;, como un aumento en la concentraci&oacute;n de gluc&oacute;geno, insulina, p&eacute;ptico C y lectina. Sin embargo, el mecanismo por el cual este compuesto ocasiona tales regulaciones a&uacute;n no est&aacute; esclarecido. Por otro lado, estudios realizados por Pari y Suman (2010) demostraron la actividad antihiperglucemiante de esta flavanona, al ser evaluada en ratas diab&eacute;ticas observ&aacute;ndose la capacidad de disminuir el estr&eacute;s oxidativo al aumentar las concentraciones de vitamina C, vitamina E y glutati&oacute;n. De esta manera, la naringina disminuye las hidroxiperoxidasas y otras sustancias reactivas, que son producidas durante el curso patol&oacute;gico de la inducci&oacute;n de la diabetes experimental. Estos resultados indican que los efectos ben&eacute;ficos de la naringina est&aacute;n relacionados con su propiedad antioxidante (&oacute; atrapar radicales libres). Sin embargo, el mecanismo por el cu&aacute;l se llevan a cabo los efectos antidiab&eacute;ticos a&uacute;n no est&aacute;n del todo esclarecidos.<sup>83</sup> Estas aseveraciones son reforzadas con los resultados de, Ali y colaboradores (2004) quienes proponen que el mecanismo de acci&oacute;n de la naringenina, est&aacute; relacionado con su actividad antioxidante.<sup>84</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Rutina</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Rutina es el gluc&oacute;sido de quercetina m&aacute;s com&uacute;n en los c&iacute;tiricos, y es reconocido por su capacidad de disminuir la permeabildiad capilar. <sup>85</sup> Por otro lado, en cuanto a sus efectos farmacol&oacute;gicos, Rauter (2010) logr&oacute; demostrar que administraciones subagudas de este flavonoide mejoran la tolerancia a la glucosa en ratas diab&eacute;ticas.<sup>86</sup> G Finalmente Kamalakkannan, Mainzen y Prince demostraron que la administraci&oacute;n subaguda de rutina en ratas diabetizadas con STZ, ejerci&oacute; una disminuci&oacute;n en los niveles de glucosa plasm&aacute;tica, hemoglobina glucosilada, y las hidroperoxidasas lip&iacute;dicas, as&iacute; como un aumento en las concentraciones s&eacute;ricas de insulina, p&eacute;ptido C y hemoglobina total Estos resultados si bien no esclarecen el mecanismo de acci&oacute;n hipoglucemiante y antihipergluc&eacute;mico de la rutina, si evidencian sus efectos ben&eacute;ficos sobre la regulaci&oacute;n del metabolismo de carbohidratos.<sup>87</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Quercetina</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">La quercetina est&aacute; principalmente presente en la naturaleza como O&#45;gluc&oacute;sido en donde uno o m&aacute;s grupos az&uacute;car se encuentran unidos a los grupos fen&oacute;licos por enlaces glucos&iacute;dicos.<sup>85</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Este compuesto presenta una gran variedad de estudios biol&oacute;gicos y farmacol&oacute;gicos relacionados con sus efectos sobre sitios clave de la regulaci&oacute;n de la secreci&oacute;n de insulina, tal es el caso de lo descrito por Torres&#45;Piedra y cols. (2010) como un potente inhibidor <i>in vitro</i> de la enzima 11&beta;&#45;hidroxiesteroide deshidrogenasa tipo 1 (11 &beta;&#45;HSD1), la cual es estimuladora de la acci&oacute;n de la hormona glucocorticoide, antagonista de la insulina y estimuladora de la gluconeog&eacute;nesis.<sup>48</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">De la misma forma se ha demostrado su actividad antidiab&eacute;tica en diferentes modeles de diabetes experimental, evidenciando que, la quercetina protege a las c&eacute;lulas &beta; pancre&aacute;ticas del estr&eacute;s oxidativo producido por la administraci&oacute;n de STZ en ratas, debido a una potente actividad antioxidante, seg&uacute;n lo descrito por Coskun y cols. (2004).<sup>88</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Por otro lado, Vessal y cols. (2003) describen que la quercetina no presenta efecto a nivel de glucosa sangu&iacute;nea en ratas normogluc&eacute;micas, sin embargo, en ratas diab&eacute;ticas inducidas con STZ, disminuy&oacute; considerablemente los niveles de glucosa en una prueba de tolerancia a la glucosa. De la misma forma, en este mismo estudio, Vessal y cols. describen un potente efecto estimulador de la enzima glucoquinasa hep&aacute;tica. Esto permite suponer que los efectos antioxidantes de la quercetina juegan un papel importante en la, regeneraci&oacute;n de los islotes pancre&aacute;ticos, lo que explicar&iacute;a el incremento de la secreci&oacute;n de insulina.<sup>89</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">De la misma forma Abdelmoaty y cols.<sup>90</sup> no encontraron efectos hipoglucemiantes en ratas normogluc&eacute;micas, sin embargo, en ratas diab&eacute;ticas inducidas con STZ, quercetina previno la hiperglicemia caracter&iacute;stica de la patolog&iacute;a, lo cual sugiere que su efecto antidiab&eacute;tico podr&iacute;a ser un producto secundario a su capacidad antioxidante. Sin embargo, Coldiron, Sanders y Watkins (2002), no encontraron modificaciones considerables en los marcadores del estr&eacute;s oxidativo, en un tratamiento con quercetina. Por lo que para elucidar el mecanismo de acci&oacute;n aplicable al tratamiento de la diabetes y sus potenciales efectos terap&eacute;uticos, es necesario elucidar los mecanismos moleculares implicados.<sup>91</sup></font></p>     <p align="justify">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los citroflavonoides m&aacute;s estudiados se dividen en dos grupos: a) glicosilados (hesperidina, naringina, rutina y diosmina) y agliconas (naringingenina y quercetina). Las agliconas se forman por la hidrolisis enzim&aacute;tica de los flavonoides glicosilados. Estos compuestos se encuentran presentes en una gran variedad de especies vegetales y son recomendados por sus propiedades antioxidantes. El presente trabajo representa una recopilaci&oacute;n de la literatura cient&iacute;fica enfocada a explicar los hallazgos sobre los efectos ben&eacute;ficos en la homeostasia de glucosa por los flavonoides aislados de los c&iacute;tricos. Estos resultados permiten proponer a los citroflavonoides como una alternativa terap&eacute;utica para el tratamiento de la diabetes debido a sus importantes efectos antioxidantes. Dichos efectos, representan un mecanismo de acci&oacute;n novedoso que a la fecha ha despertado gran inter&eacute;s por su relaci&oacute;n con una gran variedad de patolog&iacute;as del tipo cr&oacute;nico degenerativas, las cuales, parecen estar relacionadas entre s&iacute;. Es por ello, que mol&eacute;culas con potentes efectos antioxidante como los flavonoides, con fuentes de obtenciones sustentables y asequibles, incrementan el inter&eacute;s de su estudio.</font></p>  	    <p align="justify"><font face="verdana" size="2">Los citroflavonoides aqu&iacute; descritos, demuestran adem&aacute;s la capacidad de interferir en algunos de los mecanismos fisiopatol&oacute;gicos de la diabetes o bien, un efecto regulador en las consecuencias metab&oacute;licas de dicho padecimiento. Esto incrementa el potencial terap&eacute;utico de estos metabolitos secundarios. Sin embargo, es necesario esclarecer los mecanismos moleculares implicados en la regulaci&oacute;n de los efectos farmacol&oacute;gicos observados, los cuales permitan establecer par&aacute;metros de dosificaci&oacute;n, potencia y eficiencia que haga de &eacute;stos compuestos l&iacute;deres en el desarrollo de nuevas alternativas terap&eacute;uticas de la diabetes y/o sus complicaciones.</font></p>     <p align="justify">&nbsp;</p>      ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Agradecimientos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Gonz&aacute;lez&#45;S&aacute;nchez, Avel y Caba&ntilde;as Wuan, &Aacute;ngel agradecen la beca otorgada por el Programa Institucional de Orientaci&oacute;n a la Investigaci&oacute;n de la Universidad Aut&oacute;noma de Yucat&aacute;n para realizar una estancia de investigaci&oacute;n en el Laboratorio de Farmacolog&iacute;a, FQ&#45;UADY.</font></p>     <p align="justify">&nbsp;</p>      <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Rusznyak S, Szent&#45;Gyorgyi A. Vitamin P: Flavonols as Vitamins. Nature. 1936; 138:27.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7904969&pid=S1870-0195201100030000300001&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">2. Ranaud S, de Lorgeril M. Wine, alcohol, platelets, and the French Paradox for coronary heart disease. Lancet. 1992; 339 (8808): 1523&#45;1526.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7904971&pid=S1870-0195201100030000300002&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">3. Rosenkranz S, Knirel D, Dietrich H. Inhibition of the PDGF receptor by red wine flavonoids provides a molecular explanation for the "French Paradox". The FASEB Journal. 2002; 16:1958&#45;1960.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7904973&pid=S1870-0195201100030000300003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
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