<?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>0301-5092</journal-id>
<journal-title><![CDATA[Veterinaria México]]></journal-title>
<abbrev-journal-title><![CDATA[Vet. Méx]]></abbrev-journal-title>
<issn>0301-5092</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Medicina Veterinaria y Zootecnia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0301-50922009000300007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Helmintos parásitos de importancia veterinaria: regulación de la respuesta inmunitaria del portador y su uso potencial para el tratamiento de enfermedades inflamatorias]]></article-title>
<article-title xml:lang="en"><![CDATA[Parasitic helminths of veterinary concern: host immune response regulation and potential use for the treatment of inflammatory diseases]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bautista Garfias]]></surname>
<given-names><![CDATA[Carlos Ramón]]></given-names>
</name>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias Centro Nacional de Investigación Disciplinaria en Parasitología Veterinaria ]]></institution>
<addr-line><![CDATA[Jiutepec Morelos]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2009</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2009</year>
</pub-date>
<volume>40</volume>
<numero>3</numero>
<fpage>283</fpage>
<lpage>291</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0301-50922009000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0301-50922009000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0301-50922009000300007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[In recent years, a new alternative for the treatment of human inflammatory diseases, such as Crohn's disease, by oral administration of eggs from the swine parasitic nematode Trichuris suis has attracted attention, based on the capacity of helminths to polarize T helper cells (Th) to Th2 type which inhibits inflammation. In the present review the mechanisms used by parasitic helminths to modify the host immune response are analyzed and their potential use for the treatment of a variety of inflammatory diseases is discussed.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[En años recientes ha llamado la atención una nueva alternativa para el tratamiento de enfermedades inflamatorias de humanos, como la enfermedad de Crohn, por medio de la administración oral de huevos del nematodo parásito de cerdos Trichuris suis, con base en la capacidad que tienen los helmintos de polarizar la respuesta de las células T cooperadoras (Th) a una de tipo Th2 que inhibe la inflamación. En la presente revisión se analizan los mecanismos que utilizan los helmintos parásitos para modificar la respuesta inmunitaria del portador y se discute su uso potencial para el tratamiento de una variedad de enfermedades inflamatorias.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Parasitic helminths]]></kwd>
<kwd lng="en"><![CDATA[Th1 and Th2 Responses]]></kwd>
<kwd lng="en"><![CDATA[Inflamation Diseases]]></kwd>
<kwd lng="es"><![CDATA[Helmintos Parásitos]]></kwd>
<kwd lng="es"><![CDATA[Respuestas Th1 y Th2]]></kwd>
<kwd lng="es"><![CDATA[Enfermedades Inflamatorias]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Notas de investigaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Helmintos par&aacute;sitos de importancia veterinaria: </b><b>regulaci&oacute;n de la respuesta inmunitaria del portador </b><b>y su uso potencial para el tratamiento </b><b>de enfermedades inflamatorias</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Parasitic helminths of veterinary concern: host immune response regulation and potential use for the treatment of inflammatory diseases</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Carlos Ram&oacute;n Bautista Garfias*</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">* <i>Centro Nacional de Investigaci&oacute;n Disciplinaria en Parasitolog&iacute;a Veterinaria, Instituto Nacional de Investigaciones Forestales, Agr&iacute;colas y Pecuarias, Km 11.5, Carretera Federal Cuernavaca&#150;Cuautla 8534, CP 62550, Jiutepec, Morelos, 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">Recibido el 24 de marzo de 2008    <br>   Aceptado el 13 de mayo de 2009</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">In recent years, a new alternative for the treatment of human inflammatory diseases, such as Crohn's disease, by oral administration of eggs from the swine parasitic nematode <i>Trichuris suis </i>has attracted attention, based on the capacity of helminths to polarize T helper cells (Th) to Th2 type which inhibits inflammation. In the present review the mechanisms used by parasitic helminths to modify the host immune response are analyzed and their potential use for the treatment of a variety of inflammatory diseases is discussed.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Parasitic helminths, Th1 and Th2 Responses, Inflamation Diseases.</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">En a&ntilde;os recientes ha llamado la atenci&oacute;n una nueva alternativa para el tratamiento de enfermedades inflamatorias de humanos, como la enfermedad de Crohn, por medio de la administraci&oacute;n oral de huevos del nematodo par&aacute;sito de cerdos <i>Trichuris suis, </i>con base en la capacidad que tienen los helmintos de polarizar la respuesta de las c&eacute;lulas T cooperadoras (Th) a una de tipo Th2 que inhibe la inflamaci&oacute;n. En la presente revisi&oacute;n se analizan los mecanismos que utilizan los helmintos par&aacute;sitos para modificar la respuesta inmunitaria del portador y se discute su uso potencial para el tratamiento de una variedad de enfermedades inflamatorias.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Helmintos Par&aacute;sitos, Respuestas Th1 y Th2, Enfermedades Inflamatorias.</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"><b><i>Mecanismos de inducci&oacute;n de las respuestas inmunitarias innata y adquirida</i></b></font></p>     <p align="justify"><font face="verdana" size="2">La respuesta inmunitaria de los mam&iacute;feros es estimulada por sustancias extra&ntilde;as (ant&iacute;genos) que son reconocidas por mol&eacute;culas y c&eacute;lulas inmunocompetentes. La inmunidad protectora contra microorganismos, por ejemplo, es mediada por las reacciones oportunas de la inmunidad innata y las respuestas posteriores de la inmunidad adapta&#150;tiva que propician una respuesta inflamatoria.<sup>1</sup>'<sup>2</sup> En este contexto, aqu&eacute;lla es estimulada por estructuras comunes en grupos de microorganismos, mientras que esta &uacute;ltima es espec&iacute;fica para diferentes ant&iacute;genos (microbianos o no) y se incrementa por la exposici&oacute;n repetida a dichos ant&iacute;genos;<sup>3</sup> sin embargo, el sistema inmunitario no solamente puede proteger a un individuo, humano o animal, sino que tambi&eacute;n, bajo ciertas condiciones, puede causarle da&ntilde;o mediante mecanismos inmunopatol&oacute;gicos o autoinmunes.<sup>4,5</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Mecanismos inmunomoduladores de helmintos par&aacute;sitos</i></b></font></p>     <p align="justify"><font face="verdana" size="2">Los helmintos par&aacute;sitos polarizan la respuesta inmunitaria de sus portadores a una de tipo Th2, evadiendo la respuesta Th1 que debiera ocurrir bajo condiciones normales. La respuesta inmunitaria tipo Th2 se caracteriza por aumento de c&eacute;lulas T CD4+ que secretan citocinas como la IL&#150;4, IL&#150;5, IL&#150;9 e IL&#150;13; adem&aacute;s, los eosin&oacute;filos, c&eacute;lulas cebadas y bas&oacute;filos, se incrementan en la sangre y en el sitio de infecci&oacute;n. Cabe destacar que la caracter&iacute;stica principal es la gran cantidad de IgE que se detecta en el suero de humanos y animales infectados por helmintos.<sup>6</sup></font></p>     <p align="justify"><font face="verdana" size="2">En cuanto a las citocinas se&ntilde;aladas, la IL&#150;4 constituye el principal est&iacute;mulo para la producci&oacute;n de IgE y para el desarrollo de c&eacute;lulas Th2 a partir de c&eacute;lulas cooperadoras v&iacute;rgenes T CD4+.<sup>7</sup> La IL&#150;5 es un activador de eosin&oacute;filos y tambi&eacute;n funciona como enlace entre la activaci&oacute;n de c&eacute;lulas T y la inflamaci&oacute;n eosinof&iacute;lica.<sup>8,9</sup> La IL&#150;13 es una citocina similar a la IL&#150;4 y desempe&ntilde;a un papel importante en la respuesta inmunitaria contra helmintos.<sup>3</sup> La IL&#150;10 es una citocina que act&uacute;a sobre macr&oacute;fagos y c&eacute;lulas dendr&iacute;ticas que inhibe la producci&oacute;n de IL&#150;12, la expresi&oacute;n de coestimuladores y de mol&eacute;culas de clase II del complejo principal de histocompatibilidad (CPH).<sup>3</sup>,<sup>10</sup></font></p>     <p align="justify"><font face="verdana" size="2">En diferentes infecciones parasitarias se ha documentado en mayor o menor grado dicha respuesta. As&iacute;, por ejemplo, se ha observado en infecciones naturales o experimentales: <i>Heligmosomoides polygyrus,</i><sup>11 </sup><i>Fasciola hepatica</i><sup>12</sup> y <i>Nippostrongylus brasiliensis</i><sup>13</sup> en ratones; <i>Strongyloides ratti,</i><sup>14</sup><i> Fasciola hepatica</i><sup>15</sup> e <i>Hymenolepis diminuta</i><sup>16</sup> en ratas; <i>Opistorchis viverrini</i><sup>17</sup> y <i>Ancylostoma ceylanicum</i><sup>18</sup> en h&aacute;msteres; <i>Ascaridia galli </i>en gallinas;<sup>19 </sup><i>Toxocara canis</i><sup>20</sup> y <i>Dirofilaria immitis </i>en perros;<sup>21</sup> <i>Toxocara cati </i>en gatos;<sup>22</sup> <i>Ascaris suum,</i><sup>23</sup><i> Trichuris suis</i><sup>24</sup> y <i>Schistosoma japonicum </i>en cerdos;<sup>25</sup> <i>Haemonchus contortus</i><sup>26</sup> y <i>Trichostrongylus colubriformis</i><sup>27</sup> en ovinos; <i>Fasciola hepatica,</i><sup>28&#150;30</sup><i> Dictyocaulus viviparous</i><sup>31</sup> y <i>Ostertagia ostertagi </i>en bovinos;<sup>32</sup> <i>Strongylus vulgaris </i>en caballos;<sup>33</sup> <i>Trichinella spiralis y T. britovi </i>en humanos.<sup>34</sup></font></p>     <p align="justify"><font face="verdana" size="2">Para explicar la regulaci&oacute;n que ejercen los helmintos par&aacute;sitos (HP) sobre la respuesta inmunitaria, se ha propuesto que se debe a que los m&uacute;ltiples y dis&iacute;miles componentes de dichos organismos interfieren con el procesamiento de ant&iacute;geno; modulan a las c&eacute;lulas presentadoras de ant&iacute;geno (por ejemplo, c&eacute;lulas dendr&iacute;ticas&#150;CD); mimetizan citocinas del portador e interfieren con citocinas de &eacute;ste.<sup>35</sup> Se ha sugerido que los HP regulan la producci&oacute;n de citocinas Th2 en el tracto digestivo e inducen la producci&oacute;n de c&eacute;lulas T reguladoras que pueden controlar c&eacute;lulas T autorreactivas, lo que, desde el punto vista funcional, puede limitar la inflamaci&oacute;n.<sup>36</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Los HP y sus productos pueden modificar a las c&eacute;lulas dendr&iacute;ticas (CD) de diferentes maneras que oscilan entre influenciar la maduraci&oacute;n de las CD hasta afectar las se&ntilde;ales de activaci&oacute;n dentro de estas c&eacute;lulas (activaci&oacute;n de receptores tipo Toll&#150;TLR&#150;, inducci&oacute;n de la quinasa ERK).<sup>37</sup> Asimismo, se ha demostrado que favorecen el incremento de macr&oacute;fagos activados alternativamente (MAA).<sup>38</sup> Los MAA son c&eacute;lulas estimuladas por IL&#150;4, IL&#150;13, IL&#150;10 e IL&#150;21 que muestran niveles altos de expresi&oacute;n de marcadores como arginasa&#150;1, receptor CD206 de manosa y receptor &alpha; de IL&#150;4 (IL&#150;4R&alpha;), incluyendo la expresi&oacute;n incrementada de IL&#150;10.<sup>39,40</sup> Funcionalmente se ha sugerido que los MAA desempe&ntilde;an al menos tres actividades principales: regulaci&oacute;n de la respuesta inmunitaria, cicatrizaci&oacute;n de heridas y resistencia a la invasi&oacute;n parasitaria.<sup>40</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Hip&oacute;tesis de la higiene y enfermedades mediadas por el sistema inmunitario</i></b></font></p>     <p align="justify"><font face="verdana" size="2">En los pa&iacute;ses centrales la incidencia de enfermedades al&eacute;rgicas y autoinmunes o enfermedades mediadas por el sistema inmunitario en el hombre, va en constante aumento &#151;se estima que actualmente hay m&aacute;s de 40 diferentes enfermedades que en conjunto afectan a m&aacute;s del 10% de la poblaci&oacute;n en los pa&iacute;ses centrales&#151;,<sup>41</sup> a diferencia de los pa&iacute;ses perif&eacute;ricos o semiperif&eacute;ricos. Para explicar este fen&oacute;meno se ha propuesto la hip&oacute;tesis de la higiene, donde se establece que los ni&ntilde;os de los pa&iacute;ses centrales que tienen acceso a vacunas, higiene y antibi&oacute;ticos &#151;"higiene alta"&#151; presentan una baja exposici&oacute;n a pat&oacute;genos, ello propicia una red reguladora inmunitaria d&eacute;bil que provoca incremento de enfermedades al&eacute;rgicas y autoinmunes. Por el contrario, los ni&ntilde;os de los pa&iacute;ses semiperif&eacute;ricos que se exponen a infecciones helm&iacute;nticas frecuentes y en los que adem&aacute;s ocurre alta exposici&oacute;n a pat&oacute;genos &#151;"higiene baja"&#151; desarrollan una red reguladora inmunitaria s&oacute;lida y, por consecuencia, casi no se presentan enfermedades al&eacute;rgicas y autoinmunes.<sup>36&#150;</sup><sup>38,40,42&#150;</sup><sup>45</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Helmintos par&aacute;sitos utilizados para el tratamiento de algunas enfermedades mediadas por el sistema inmunitario</i></b></font></p>     <p align="justify"><font face="verdana" size="2">Diversas enfermedades autoinmunes y al&eacute;rgicas han sido tratadas experimentalmente con helmintos par&aacute;sitos (HP) y sus productos (<a href="#c1">Cuadro 1</a>), con base en las observaciones de que los HP, como ya se indic&oacute;, para sobrevivir modifican la respuesta inmunitaria de su portador de tal forma que inhiben la respuesta inflamatoria (<a href="#f1">Figura 1</a>).</font></p>     <p align="center"><font face="verdana" size="2"><a name="c1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/vetmex/v40n3/a7c1.jpg"></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/vetmex/v40n3/a7f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><b>Futuro del uso de helmintos par&aacute;sitos o&nbsp;sus fracciones para el tratamiento de enfermedades autoinmunes</b></i></font></p>     <p align="justify"><font face="verdana" size="2">La informaci&oacute;n disponible actualmente indica que: <i>a) </i>la prevalencia de enfermedades mediadas por el sistema inmunitario (EMSI) en humanos se incrementa en las &aacute;reas que practican una atenci&oacute;n meticulosa a la higiene; <i>b) </i>estas pr&aacute;cticas eliminan la exposici&oacute;n natural a los helmintos par&aacute;sitos; <i>c) </i>los helmintos par&aacute;sitos pueden prevenir las EMSI por medio de la modificaci&oacute;n de las respuestas inmunitarias; <i>d) </i>la exposici&oacute;n a helmintos par&aacute;sitos puede servir para el tratamiento de algunas EMSI de humanos (por ejemplo, enfermedades inflamatorias del intestino, asma, diabetes tipo 1&nbsp; y esclerosis m&uacute;ltiple) y probablemente tambi&eacute;n en ESMI de animales dom&eacute;sticos.<sup>5</sup></font></p>     <p align="justify"><font face="verdana" size="2">Debido al &eacute;xito del tratamiento de EMSI con helmintos par&aacute;sitos hasta la fecha, se han propuesto las siguientes caracter&iacute;sticas ideales que deben reunir &eacute;stos para su uso terap&eacute;utico en humanos;<sup>54</sup> <i>a) </i>tener poco o nulo potencial patog&eacute;nico; <i>b) </i>no tener capacidad de multiplicaci&oacute;n en el portador; <i>c) </i>no difundirse directamente a contactos estrechos; <i>d) </i>producir colonizaci&oacute;n autolimitada en humanos; <i>e) </i>producir colonizaci&oacute;n asintom&aacute;tica en humanos; <i>f) </i>no alterar el comportamiento en pacientes con inmunidad deprimida; <i>g) </i>no ser afectado por medicamentos de uso com&uacute;n; <i>h) </i>ser erradicados con un f&aacute;rmaco antihelm&iacute;ntico; <i>i) </i>ser aislados libres de otros pat&oacute;genos potenciales; <i>j) </i>ser aislados o producidos en grandes cantidades; <i>k) </i>ser estabilizados para transporte y almacenamiento; <i>l) </i>administrarse f&aacute;cilmente.</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">Los helmintos par&aacute;sitos, adem&aacute;s de producir parasitosis con morbilidades y mortalidades diversas, pueden tener un efecto perjudicial sobre sus portadores; por ejemplo, causar inmunosupresi&oacute;n a ant&iacute;genos timodependientes<sup>59</sup> en donde se afecta la respuesta inmunitaria hacia ant&iacute;genos vacunales,<sup>60,61</sup> y de diagn&oacute;stico, como es el caso de la alteraci&oacute;n de la respuesta de bovinos infectados con <i>F. hepatica </i>a pruebas de diagn&oacute;stico de tuberculosis.<sup>62</sup> Sin embargo, existen estudios cada vez m&aacute;s detallados de utilidad de la respuesta inmunitaria del portador contra los helmintos,<sup>63&#150;69</sup> y sus ant&iacute;genos<sup>70</sup> como terapias alternativas de enfermedades autoinmunes en el humano.<sup>71&#150;73</sup></font></p>     <p align="justify"><font face="verdana" size="2">El conocimiento de que los helmintos evaden las respuestas de tipo Th1 ha propiciado nuevas estrategias de control de dichos par&aacute;sitos<sup>74&#150;80</sup> basadas en la estimulaci&oacute;n inespec&iacute;fica de las respuestas Th1 mediante sustancias inmunoestimuladoras.<sup>81&#150;84</sup> Asimismo, se ha indicado que la caracterizaci&oacute;n de mol&eacute;culas derivadas de los helmintos que interaccionan con receptores tipo Toll y correceptores que estimulan una respuesta antiinflamatoria podr&iacute;a utilizarse para el dise&ntilde;o de nuevos f&aacute;rmacos y vacunas<sup>37</sup> y tambi&eacute;n ser&iacute;a posible modular e inducir quinasas selectivamente, como la ERK&#150; involucrada en la inducci&oacute;n de respuestas Th2&#150;, cuya ausencia est&aacute; relacionada con aumento de enfermedad autoinmune,<sup>85</sup> analizando los patrones de se&ntilde;alizaci&oacute;n estimulados por las mol&eacute;culas derivadas de helmintos.<sup>37,86</sup></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>Conclusiones</b></font></p>     <p align="justify"><font face="verdana" size="2">La exposici&oacute;n natural o experimental de diversas especies de portadores a helmintos par&aacute;sitos o a sus productos reduce las respuestas inmunitarias da&ntilde;inas de las enfermedades autoinmunes (tipo Th1) y al&eacute;rgicas (tipo Th2).</font></p>     <p align="justify"><font face="verdana" size="2">Existe la posibilidad de utilizar helmintos par&aacute;sitos (o productos derivados de &eacute;stos) de animales dom&eacute;sticos como alternativa viable para el tratamiento tanto de enfermedades autoinmunes como de enfermedades al&eacute;rgicas del ser humano.</font></p>     <p align="justify"><font face="verdana" size="2">El estudio de los diversos mecanismos que operan la respuesta inmunitaria del portador contra helmintos par&aacute;sitos permitir&aacute; dise&ntilde;ar mejores estrategias para el control de &eacute;stos y tambi&eacute;n la utilizaci&oacute;n de mol&eacute;culas (nativas o recombinantes) para el tratamiento de afecciones del hombre y sus animales dom&eacute;sticos.</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">1. 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