<?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>0036-3634</journal-id>
<journal-title><![CDATA[Salud Pública de México]]></journal-title>
<abbrev-journal-title><![CDATA[Salud pública Méx]]></abbrev-journal-title>
<issn>0036-3634</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud Pública]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0036-36342005000600011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Terapia génica con citocinas contra cáncer cervicouterino]]></article-title>
<article-title xml:lang="en"><![CDATA[Gene therapy with cytokines against cervical cancer]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bermúdez-Morales]]></surname>
<given-names><![CDATA[Víctor Hugo]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Peralta-Zaragoza]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Madrid-Marina]]></surname>
<given-names><![CDATA[Vicente]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro de Investigaciones sobre Enfermedades Infecciosas Instituto Nacional de Salud Pública ]]></institution>
<addr-line><![CDATA[Cuernavaca Morelos]]></addr-line>
<country>México</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Medicina ]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2005</year>
</pub-date>
<volume>47</volume>
<numero>6</numero>
<fpage>458</fpage>
<lpage>468</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0036-36342005000600011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0036-36342005000600011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0036-36342005000600011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La terapia génica es una excelente alternativa para el tratamiento de muchas enfermedades. La capacidad para manipular el DNA ha permitido dirigir la terapia génica para corregir la función de un gen alterado, aumentar la expresión de un gen o activar la respuesta inmune. Así, se puede proponer el uso del DNA como un medicamento capaz de controlar, corregir o curar una enfermedad. La terapia génica contra cáncer tiene un potencial enorme, y en la última década se han obtenido resultados muy alentadores del uso del DNA para controlar diversas neoplasias en modelos animales, lo cual ha permitido su aplicación en protocolos experimentales en humanos. Esta revisión concentra una reseña de los fundamentos de la terapia génica y su aplicación en cáncer cervical, desde el punto de vista de las alteraciones de la respuesta inmune enfocadas al microambiente tumoral y el uso de las citocinas como moduladores de la respuesta inmune.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Gene therapy is an excellent alternative for treatment of many diseases. Capacity to manipulate the DNA has allowed direct the gene therapy to correct the function of an altered gene, to increase the expression of a gene and to favour the activation of the immune response. This way, it can intend the use of the DNA like medication able to control, to correct or to cure many diseases. Gene therapy against cancer has an enormous potential, and actually the use of the DNA has increased to control diverse cancer in animal models, with very encouraging results that have allowed its applications in experimental protocols in human. This work concentrates a review of the foundations of the gene therapy and its application on cervical cancer, from the point of view of the alterations of the immune system focused on the tumour micro-environment, and the use of the cytokines as immunomodulators.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cáncer cervical]]></kwd>
<kwd lng="es"><![CDATA[citocinas]]></kwd>
<kwd lng="es"><![CDATA[DNA]]></kwd>
<kwd lng="es"><![CDATA[terapia génica]]></kwd>
<kwd lng="es"><![CDATA[virus del papiloma humano]]></kwd>
<kwd lng="en"><![CDATA[cervical cancer]]></kwd>
<kwd lng="en"><![CDATA[cytokines]]></kwd>
<kwd lng="en"><![CDATA[DNA]]></kwd>
<kwd lng="en"><![CDATA[gene therapy]]></kwd>
<kwd lng="en"><![CDATA[human papillomavirus]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <HTML> <HEAD> <TITLE>a11v47n6</TITLE>     <p align="right"><font size="2" face="Verdana"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p><font size="4" face="Verdana"> <b> Terapia g&eacute;nica con citocinas contra    c&aacute;ncer cervicouterino </b></font></p>     <p>&nbsp;</p>     <p><font size="3" face="verdana"><b>Gene therapy with cytokines against cervical    cancer</b></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>V&iacute;ctor Hugo Berm&uacute;dez-Morales,    M en C<sup>I, II</sup>; Oscar Peralta-Zaragoza, M en C<sup>I, II</sup>; Vicente    Madrid-Marina, Dr en C<sup>I</sup></b></font></p>     <p><font size="2" face="Verdana"><sup>I</sup>Centro de Investigaciones sobre Enfermedades    Infecciosas. Instituto Nacional de Salud P&uacute;blica, Cuernavaca, Morelos,    M&eacute;xico    ]]></body>
<body><![CDATA[<br>   <sup>II</sup>Facultad de Medicina, Universidad Nacional Aut&oacute;noma de M&eacute;xico.    M&eacute;xico, D. F. , M&eacute;xico</font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>RESUMEN</b> </font></p>     <p><font size="2" face="Verdana">La terapia g&eacute;nica es una excelente alternativa    para el tratamiento de muchas enfermedades. La capacidad para manipular el DNA    ha permitido dirigir la terapia g&eacute;nica para corregir la funci&oacute;n    de un gen alterado, aumentar la expresi&oacute;n de un gen o activar la respuesta    inmune. As&iacute;, se puede proponer el uso del DNA como un medicamento capaz    de controlar, corregir o curar una enfermedad. La terapia g&eacute;nica contra    c&aacute;ncer tiene un potencial enorme, y en la &uacute;ltima d&eacute;cada    se han obtenido resultados muy alentadores del uso del DNA para controlar diversas    neoplasias en modelos animales, lo cual ha permitido su aplicaci&oacute;n en    protocolos experimentales en humanos. Esta revisi&oacute;n concentra una rese&ntilde;a    de los fundamentos de la terapia g&eacute;nica y su aplicaci&oacute;n en c&aacute;ncer    cervical, desde el punto de vista de las alteraciones de la respuesta inmune    enfocadas al microambiente tumoral y el uso de las citocinas como moduladores    de la respuesta inmune.</font></p>     <p><font size="2" face="Verdana"><b>Palabras clave:</b> c&aacute;ncer cervical,    citocinas, DNA, terapia g&eacute;nica, virus del papiloma humano</font></p> <hr size="1" noshade>     <p><font size="2" face="Verdana"><b>ABSTRACT</b></font></p>     <p><font size="2" face="Verdana">Gene therapy is an excellent alternative for    treatment of many diseases. Capacity to manipulate the DNA has allowed direct    the gene therapy to correct the function of an altered gene, to increase the    expression of a gene and to favour the activation of the immune response. This    way, it can intend the use of the DNA like medication able to control, to correct    or to cure many diseases. Gene therapy against cancer has an enormous potential,    and actually the use of the DNA has increased to control diverse cancer in animal    models, with very encouraging results that have allowed its applications in    experimental protocols in human. This work concentrates a review of the foundations    of the gene therapy and its application on cervical cancer, from the point of    view of the alterations of the immune system focused on the tumour micro-environment,    and the use of the cytokines as immunomodulators. </font></p>     <p><font size="2" face="Verdana"><b>Key words:</b> cervical cancer; cytokines;    DNA; gene therapy; human papillomavirus</font></p> <hr size="1" noshade>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p><font size="2" face="Verdana">La terapia g&eacute;nica consiste en el tratamiento,    prevenci&oacute;n o eliminaci&oacute;n de alguna enfermedad mediante la transferencia    de DNA o el uso de genes para reemplazar alg&uacute;n gen que est&eacute; alterado,    que codifiquen para un ant&iacute;geno de origen infeccioso, tumoral, o para    mol&eacute;culas inmunoreguladoras de la respuesta inmune como: citocinas y    quimiocinas. En virtud de que esta tecnolog&iacute;a intenta corregir el origen    gen&eacute;tico de una enfermedad y no s&oacute;lo sus s&iacute;ntomas, tendr&aacute;    un potencial enorme en la biomedicina moderna, por lo que se espera que sea    impulsora de una nueva revoluci&oacute;n en la terapia contra diversas enfermedades.    </font></p>     <p><font size="2" face="Verdana"> Los primeros protocolos de terapia g&eacute;nica    fueron realizados con la idea inicial de corregir enfermedades con un origen    gen&eacute;tico hereditario bien definido, mediante la inserci&oacute;n de un    gen funcional y reemplazar al gen defectuoso. Sin embargo, el uso de esta tecnolog&iacute;a    se ha extendido a diversas enfermedades con diferente origen, ya sea infeccioso,    al&eacute;rgico, enfermedades auto-inmunes, enfermedades cardiovasculares y    muy ampliamente en el tratamiento del c&aacute;ncer. </font></p>     <p><font size="2" face="Verdana"> Existen dos tipos b&aacute;sicos de terapia    g&eacute;nica que han sido aplicados en humanos: la germinal y la som&aacute;tica.    La terapia g&eacute;nica germinal introduce la modificaci&oacute;n gen&eacute;tica    en las c&eacute;lulas reproductoras, en c&eacute;lulas precursoras de la l&iacute;nea    germinal o en las c&eacute;lulas embrionarias en las primeras etapas del desarrollo.    En el caso de las c&eacute;lulas germinales los efectos terap&eacute;uticos    se manifiestan en los descendientes que se originan a partir de las c&eacute;lulas    germinales tratadas. La terapia g&eacute;nica som&aacute;tica dirige la modificaci&oacute;n    gen&eacute;tica a cualquier tejido corporal (o soma) inverso al fenotipo de    la enfermedad.<SUP>1</SUP> En este sentido, se pueden proponer varias formas    de c&oacute;mo abordar la correcci&oacute;n de los genes alterados. Una estrategia    es mediante la inserci&oacute;n del gen normal dentro de una c&eacute;lula o    tejido de inter&eacute;s, y reemplazar el gen alterado para reestablecer el    fenotipo normal. Otra forma es generar un intercambio del gen anormal, mediante    un proceso de recombinaci&oacute;n hom&oacute;loga, o bien, por medio de una    regulaci&oacute;n de un gen alterado; es decir, regular la expresi&oacute;n    de los genes.</font></p>     <p><font size="2" face="Verdana"><b>Terapia g&eacute;nica contra el c&aacute;ncer</b></font></p>     <p><font size="2" face="Verdana">A pesar de los grandes avances obtenidos en la    patolog&iacute;a molecular y en el entendimiento del desarrollo y progresi&oacute;n    tumoral, a&uacute;n no se ha generado una vacuna como tratamiento para el c&aacute;ncer.    En contraste con las enfermedades hereditarias, caracterizadas por defectos    monog&eacute;nicos bien definidos, la mayor&iacute;a de los tipos de c&aacute;ncer    en humanos se desarrollan a partir de m&uacute;ltiples pasos que involucran    alteraciones en varios genes que son responsables del fenotipo neopl&aacute;sico    de las c&eacute;lulas malignas.<SUP>2</SUP> De esta manera, mientras que la    terapia g&eacute;nica por sustituci&oacute;n de un solo gen puede emplearse    para corregir un defecto gen&eacute;tico recesivo o dominante, no es una alternativa    muy adecuada para el tratamiento contra el c&aacute;ncer. Por esa raz&oacute;n,    la mayor&iacute;a de los tratamientos oncol&oacute;gicos enfocan su acci&oacute;n    a inhibidores del ciclo celular, a macromol&eacute;culas que tienen una funci&oacute;n    alterada y a inmunoreguladores de la respuesta inmune, y utilizan drogas, enzimas,    hormonas, factores de crecimiento, citocinas y receptores modificados, los cuales    inciden en el mantenimiento de la actividad tumoral. </font></p>     <p><font size="2" face="Verdana"> La terapia g&eacute;nica contra el c&aacute;ncer    propone reemplazar o alterar la expresi&oacute;n de algunos genes que promueven    el proceso tumoral. Por ejemplo, la p&eacute;rdida de genes supresores de tumor    (como el gen p53) y la sobreexpresi&oacute;n de oncogenes (por ejemplo, K-ras)    se han identificado en varias neoplasias. Esto ha permitido corregir una anormalidad    gen&eacute;tica por la inserci&oacute;n de una copia del gen normal y la reversi&oacute;n    del fenotipo maligno asociado con la muerte de la c&eacute;lula tumoral.<SUP>3,4</SUP>    Sin embargo, aunque estos resultados son alentadores, esta alternativa no ha    tenido a&uacute;n el &eacute;xito esperado en su aplicaci&oacute;n en modelos    <I>in vivo</I>. As&iacute;, con la finalidad de incrementar la eficiencia terap&eacute;utica    de este tipo de procedimientos, ser&aacute; necesario implementar nuevas estrategias    para poder transferir genes a las c&eacute;lulas malignas, y evitar que las    c&eacute;lulas normales sean afectadas. </font></p>     <p><font size="2" face="Verdana"> Se han considerado una lista de genes que podr&aacute;n    ser usados en el tratamiento contra el c&aacute;ncer mediante terapia g&eacute;nica.    Estos incluyen: genes que codifican para citocinas y mol&eacute;culas coestimuladoras    de superficie celular; quimiocinas, las cuales son necesarias para activar la    respuesta inmune sist&eacute;mica contra ant&iacute;genos espec&iacute;ficos    de tumor; genes que codifican para ant&iacute;genos espec&iacute;ficos de tumor.    Por otro lado, se han publicado varios trabajos donde se usan genes que codifican    para prodrogas o tambi&eacute;n llamados genes suicidas, como la timidina cinasa    del virus <I>Herpex simples</I>, la nitroreductasa, la citocina desaminasa de    <I>Escherichia coli</I>, la hidrogenasa de <I>Clostridium acetobutylicum</I>,    la timidina fosfatasa, diferentes isoformas de citocromo P450, deoxicitidina    cinasa y la flavodoxina.<SUP>5 </SUP>Adicionalmente, diversas estrategias y    veh&iacute;culos se han propuesto para transportar los genes terap&eacute;uticos    hasta su sitio blanco (<a href="#qdr01">cuadro I</a>).</font></p>     <p><a name="qdr01"></a></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="center"><img src="/img/revistas/spm/v47n6/a11qdr01.gif"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Respuesta inmune antitumoral</b></font></p>     <p><font size="2" face="Verdana">La inmunovigilancia tumoral se mide mediante    dos tipos de mecanismos: la respuesta inmune innata y la respuesta inmune adaptativa.    La respuesta inmune innata se considera como la primera barrera contra las c&eacute;lulas    tumorales, las cuales son reconocidas por un proceso independiente de ant&iacute;geno.    Este mecanismo es mediado por un patr&oacute;n de receptores y de mol&eacute;culas    de superficie celular expresados en la c&eacute;lula tumoral. Entre las principales    c&eacute;lulas que reconocen a la c&eacute;lula tumoral se encuentran las c&eacute;lulas    asesinas naturales (c&eacute;lulas NK), las cuales reconocen la baja o nula    expresi&oacute;n de mol&eacute;culas MHC I sobre la c&eacute;lula tumoral, as&iacute;    como prote&iacute;nas relacionadas con estr&eacute;s, como la expresi&oacute;n    de MICA y MICB, que son ligandos de los receptores NKG2D expresados por las    c&eacute;lulas NK.<SUP>6</SUP> </font></p>     <p><font size="2" face="Verdana"> En relaci&oacute;n con la respuesta inmune adaptativa,    &eacute;sta requiere del reconocimiento de ant&iacute;genos tumorales para reconocer    y eliminar la c&eacute;lula tumoral por medio de las c&eacute;lulas efectoras    de la respuesta inmune. Se ha demostrado que la respuesta inmune mediada por    c&eacute;lulas es la m&aacute;s importante para eliminar las c&eacute;lulas    neopl&aacute;sicas. Esta respuesta es dependiente de la activaci&oacute;n de    los linfocitos T y de las c&eacute;lulas presentadoras de ant&iacute;genos profesionales    (APC).<SUP>7</SUP> La activaci&oacute;n de los linfocitos T, requiere que las    c&eacute;lulas dendr&iacute;ticas (CD) capturen y procesen el detritus celular    tumoral, migren a los n&oacute;dulos linf&aacute;ticos regionales para presentar    los ant&iacute;genos tumorales a los linfocitos T CD8<SUP>+</SUP> mediante las    mol&eacute;culas del MHC clase I. En este proceso se activan tanto los linfocitos    T CD4<SUP>+</SUP> y CD8<SUP>+</SUP> espec&iacute;ficos contra p&eacute;ptidos    tumorales, los cuales son reconocidos a trav&eacute;s de las mol&eacute;culas    del MHC. Los linfocitos T CD8<SUP>+</SUP> citot&oacute;xicos son los responsable    de lisar y eliminar a las c&eacute;lulas tumorales, por el reconocimiento de    p&eacute;ptidos tumorales asociados a las mol&eacute;culas del MHC clase I expresado    en la superficie de la c&eacute;lula tumoral. Por otro lado, los linfocitos    T CD4<SUP>+</SUP> son los encargados de orquestar la respuesta inmune antitumoral,    ya que est&aacute;n involucrados en la inducci&oacute;n y activaci&oacute;n    de los linfocitos T CD8<SUP>+</SUP> citot&oacute;xicos a trav&eacute;s de la    producci&oacute;n de citocinas. Adem&aacute;s, los linfocitos T CD4<SUP>+</SUP>    son capaces de interactuar con las c&eacute;lulas APCs en el proceso de presentaci&oacute;n    de ant&iacute;genos tumorales (<I>priming</I>) y activar a los precursores de    linfocitos T CD8<SUP>+</SUP> (<a href="#fig01">figura 1</a>).<SUP>8,9</SUP>    </font></p>     <p><a name="fig01"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/spm/v47n6/a11fig01.gif"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><b>Citocinas y microambiente tumoral</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Muchos de los eventos de la respuesta inmune    est&aacute;n regulados por mol&eacute;culas solubles llamadas citocinas, las    cuales son secretadas por una gran variedad de tipos celulares, pero principalmente    las producen los linfocitos T CD4<SUP>+</SUP>. Las citocinas son prote&iacute;nas    de bajo peso molecular, que pueden secretarse o permanecer unidas a la membrana    celular. Para realizar su funci&oacute;n biol&oacute;gica se requieren en concentraciones    de nanogramos a picogramos. Las citocinas act&uacute;an de manera aut&oacute;crina    al modular la actividad celular, o de manera par&aacute;crina al inducir la    producci&oacute;n de otras citocinas mediante otras estirpes celulares. Adem&aacute;s,    las citocinas son importantes en la regulaci&oacute;n de la proliferaci&oacute;n    y diferenciaci&oacute;n celular, en la quimiot&aacute;xis celular y en la activaci&oacute;n    de c&eacute;lulas de la respuesta inmune.<SUP>10</SUP> Las citocinas se secretan    en respuesta a una amplia variedad de est&iacute;mulos como: estr&eacute;s celular,    lesiones inducidas por carcin&oacute;genos, infecciones o inflamaci&oacute;n.    En este contexto, las citocinas estimulan la respuesta del hu&eacute;sped al    controlar el estr&eacute;s y la homeostasis celular. </font></p>     <p><font size="2" face="Verdana"> En general, hay dos grupos de citocinas que    pueden ser distinguibles con base en su participaci&oacute;n en los procesos    de infecci&oacute;n y/o inflamaci&oacute;n. Las citocinas que est&aacute;n directa    o indirectamente involucradas en los procesos inflamatorios reciben el nombre    de citocinas proinflamatorias &#91;la interleucina (IL)-1, IL-2, IL-6, el interfer&oacute;n    (IFN)- <font face="Symbol">g</font> y el factor de necrosis tumoral (TNF)-<font face="Symbol">a</font>&#93;    y promueven la respuesta inmune mediada por c&eacute;lulas. Las citocinas que    suprimen la actividad de las citocinas proinflamatorias son las citocinas antiinflamatorias.    Por ejemplo, IL-4, IL-10 e IL-13, que son potentes mediadores de los linfocitos    B. De esta manera, el perfil de expresi&oacute;n de citocinas presentes en una    enfermedad determinar&aacute; el tipo de respuesta inmune que se genere.<SUP>11,12</SUP>    </font></p>     <p><font size="2" face="Verdana"> Recientemente, se ha determinado que en diversos    tipos de c&aacute;ncer se genera un microambiente tumoral, a causa de la expresi&oacute;n    o represi&oacute;n de diferentes genes (como Fas, ligando de Fas, citocinas    y quimiocinas), importantes en la respuesta inmune y de la c&eacute;lula tumoral;    tambi&eacute;n se producen citocinas inmunosupresoras en el sitio tumoral, las    cuales favorecen la progresi&oacute;n del proceso neopl&aacute;sico.<SUP>13</SUP>    En virtud de que las citocinas tienen funciones pleiotr&oacute;picas, es dif&iacute;cil    determinar la participaci&oacute;n de una citocina en particular en la progresi&oacute;n    del c&aacute;ncer. Esto se debe a la relaci&oacute;n con otras citocinas, factores    de crecimiento y hormonas, que act&uacute;an simult&aacute;neamente en el sitio    del tumor, as&iacute; como con el blanco celular sobre el que act&uacute;an.<SUP>14</SUP>    Hay dos mecanismos que pueden explicar la participaci&oacute;n de las citocinas    en el desarrollo del c&aacute;ncer. 1) Es posible que las citocinas favorezcan    el desarrollo tumoral al interactuar con factores de proliferaci&oacute;n, inducir    la actividad de la angiog&eacute;nesis del tumor, y promover la met&aacute;stasis    por el incremento de la adhesi&oacute;n celular. 2) Las citocinas como mediadores    de la respuesta inmune pueden inhibir la expresi&oacute;n de las mol&eacute;culas    y receptores, tanto de las c&eacute;lulas de la respuesta inmune como de la    c&eacute;lula tumoral, las cuales est&aacute;n involucradas en la identificaci&oacute;n    y destrucci&oacute;n de la c&eacute;lula tumoral (como la desregulaci&oacute;n    de las mol&eacute;culas MHC clase I y II, de mol&eacute;culas coestimuladoras    y la desregulaci&oacute;n de la cadena zeta del complejo TcR/CD3).<SUP>14-17</SUP>    </font></p>     <p><font size="2" face="Verdana"> En diferentes neoplasias, se ha observado una    tendencia en la expresi&oacute;n de citocinas antiinflamatorias y una disminuci&oacute;n    de expresi&oacute;n de citocinas proinflamatorias.<SUP>18-20</SUP> Este cambio    en la expresi&oacute;n de citocinas proinflamatorias a antiinflamatorias podr&iacute;a    facilitar la progresi&oacute;n tumoral por la subversi&oacute;n de los mecanismos    de inmunovigilancia celular. Particularmente, se ha observado un perfil de expresi&oacute;n    de citocinas antiinflamatorias en pacientes con carcinoma cervical.<SUP>21</SUP>    En este sentido, la expresi&oacute;n de las citocinas IL-4, IL-10 y TGF-<font face="Symbol">b</font>1    correlaciona con la severidad de la enfermedad asociada con la infecci&oacute;n    del virus del papiloma humano.<SUP>22-24</SUP> Por lo tanto, la expresi&oacute;n    de un perfil de citocinas antiinflamatorias en el microambiente tumoral cervical    favorece un estado de inmunosupresi&oacute;n local, el cual se asocia con la    desregulaci&oacute;n de varias mol&eacute;culas de la respuesta inmune.<SUP>25</SUP>    En favor de esta hip&oacute;tesis, se ha informado sobre varias alteraciones    de la respuesta inmune en pacientes con lesiones cervicales premalignas y malignas.    Por ejemplo, se ha informado de una baja expresi&oacute;n de mol&eacute;culas    del MHC clase I asociada a la baja expresi&oacute;n de TAP1,<SUP>26</SUP> de    disminuci&oacute;n de la expresi&oacute;n de mol&eacute;culas coestimuladoras    como B7 sobre la c&eacute;lula tumoral,<SUP>27</SUP> de baja expresi&oacute;n    de CD25<SUP>28</SUP> y de la cadena z del complejo TcR/CD3 en linfocitos T infiltrantes    de tumor y en c&eacute;lulas NKTs.<SUP>29,30</SUP></font></p>     <p><font size="2" face="Verdana"><b>Citocinas como terapia g&eacute;nica contra    el c&aacute;ncer</b></font></p>     <p><font size="2" face="Verdana">Las c&eacute;lulas tumorales tienen baja capacidad    para activar a la respuesta inmune, como resultado de la disminuci&oacute;n    de la expresi&oacute;n de mol&eacute;culas del MHC clase I y II, de mol&eacute;culas    de adhesi&oacute;n celular y de mol&eacute;culas coestimuladoras. Esto impide    la adecuada presentaci&oacute;n de ant&iacute;genos tumorales y la activaci&oacute;n    de los linfocitos T. Este efecto se confirma por la secreci&oacute;n de citocinas    inmunosupresoras como IL-10 y TGF-<font face="Symbol">b</font>1 y una nula expresi&oacute;n    de citocinas proinflamatorias involucradas en la activaci&oacute;n de la respuesta    inmune. </font></p>     <p><font size="2" face="Verdana"> Estos mecanismos de evasi&oacute;n a la respuesta    inmune podr&iacute;an superarse con la introducci&oacute;n de genes que codifiquen    para mol&eacute;culas inmunomoduladoras, dentro del microambiente tumoral. La    identificaci&oacute;n de las citocinas y quimiocinas como inductores de la maduraci&oacute;n,    activaci&oacute;n y migraci&oacute;n de c&eacute;lulas efectoras de la respuesta    inmune ha permitido su uso como activadores de la respuesta inmune contra varios    tumores. En varios modelos tumorales se ha determinado que las citocinas pueden    favorecer la regresi&oacute;n del tumor, al activar la respuesta inmune mediada    por c&eacute;lulas. Las citocinas IFN-<font face="Symbol">g</font>, IL-2, IL-12,    IL-18 y el factor estimulador de colonias de granulocitos-monocitos (GM-CSF)    recombinantes se han utilizado preferentemente como inmunoterapia contra el    c&aacute;ncer. Estas citocinas promueven la activaci&oacute;n de linfocitos    T contra ant&iacute;genos tumorales, activan la respuesta inmune no especifica    e inducen la expresi&oacute;n de otras citocinas activadoras. Adem&aacute;s,    pueden activar varias c&eacute;lulas de la respuesta inmune como: las c&eacute;lulas    NK, monocitos y macr&oacute;fagos. Estas citocinas favorecen la presentaci&oacute;n    de los ant&iacute;genos espec&iacute;ficos del tumor por parte de las propias    c&eacute;lulas malignas.<SUP>31 </SUP>Sin embargo, la inmunoterapia con citocinas    como activadores de la respuesta inmune est&aacute; asociada con la vida media    de estas citocinas y con la actividad t&oacute;xica a nivel sist&eacute;mico.    Por lo tanto, la terapia g&eacute;nica es la v&iacute;a m&aacute;s factible    para la administraci&oacute;n local de estas citocinas. La liberaci&oacute;n    de los genes directamente en los tumores genera la expresi&oacute;n de los genes    de las citocinas en las c&eacute;lulas del tumor, por lo que las altas dosis    de las citocinas se producen en el &aacute;mbito local, y se reduce la toxicidad    de la liberaci&oacute;n de las citocinas recombinantes en el &aacute;mbito sist&eacute;mico.<SUP>32</SUP></font></p>     <p><font size="2" face="Verdana"><b>Citocinas como terapia g&eacute;nica en c&aacute;ncer    cervical</b></font></p>     <p><font size="2" face="Verdana">El gran avance de las investigaciones en la terapia    g&eacute;nica contra el c&aacute;ncer cervical est&aacute; enfocado principalmente    a los oncogenes E6 y E7 del virus del papiloma humano (VPH), como ant&iacute;genos    espec&iacute;ficos del tumor para generar inmunogenicidad tumoral. Estos genes    se han usado en vacunas profil&aacute;cticas y terap&eacute;uticas en diversas    estrategias de terapia g&eacute;nica. En este sentido, se han inyectado simplemente    los genes en el sitio del tumor como DNA desnudo,<SUP>33-35 </SUP>mediante el    uso de una pistola de DNA (<I>gene gun</I>)<SUP>36</SUP> o usando veh&iacute;culos    virales para liberar el material gen&eacute;tico como: los vectores adenovirales,<SUP>37</SUP>    virus adenoasociados,<SUP>38</SUP> el virus de vaccinia,<SUP>39</SUP> alphavirus,<SUP>40    </SUP>el virus de estomatitis vesicular<SUP>41</SUP> o speudovirus de VPH.<SUP>42,43</SUP>    Adem&aacute;s, se han utilizado otros veh&iacute;culos bacterianos como: <I>Listeria    monocytogenes</I>,<SUP>44 </SUP><I>Salmonella typhimurium</I>,<SUP>45 </SUP>y    <I>Mycobacterium bovis</I>.<SUP>46 </SUP>(<a href="#qdr01">cuadros I</a> y <a href="#qdr02">II</a>).    Adicionalmente, otras prote&iacute;nas de VPH como E1, E2, E4, E5, L1 y L2 se    han considerado como ant&iacute;genos de tumor para el control del c&aacute;ncer    cervical.<SUP>33,36,47</SUP> </font></p>     <p><a name="qdr02"></a></p>     ]]></body>
<body><![CDATA[<p>&nbsp;</p>     <p align="center"><img src="/img/revistas/spm/v47n6/a11qdr02.gif"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"> Recientemente se demostr&oacute; que las prote&iacute;nas    virales E5, E6 y E7 del VPH regulan la expresi&oacute;n de genes heter&oacute;logos    celulares y pueden contribuir al desarrollo del c&aacute;ncer cervical.<SUP>48-50</SUP>    Entre estos genes se encuentran la regulaci&oacute;n de las citocinas IL-10    y TGF-<font face="Symbol">b</font>1, lo cual correlaciona con la detecci&oacute;n    de estas citocinas en pacientes con c&aacute;ncer cervical y con el desarrollo    de un estado de inmunosupresi&oacute;n en el microambiente tumoral. Este mecanismo    de evasi&oacute;n de la respuesta inmune es consistente con la desregulaci&oacute;n    de la inmunovigilancia tumoral de la que se informa en otros tipos de c&aacute;ncer.    A favor de revertir el efecto de inmunosupresi&oacute;n en el microambiente    tumoral, se han empleado diferentes estrategias como la inhibici&oacute;n de    las prote&iacute;nas oncog&eacute;nicas de VPH, la activaci&oacute;n de la respuesta    inmune espec&iacute;fica del hu&eacute;sped en contra del VPH por el uso de    ant&iacute;genos espec&iacute;ficos de VPH, la inducci&oacute;n de la expresi&oacute;n    de mol&eacute;culas coestimuladoras (B7, cadena <font face="Symbol">z</font>    de CD3, MHC clase I) y, muy importante, la administraci&oacute;n de citocinas    tipo Th1 para activar la respuesta inmune tipo celular.<SUP>51</SUP> </font></p>     <p><font size="2" face="Verdana"> Los interferones (IFN), as&iacute; como las    citocinas IL-2, IL-12, y GM-CSF, se consideran como los principales inmunomoduladores    de la respuesta inmune celular, y se han empleado en diversos modelos precl&iacute;nicos    contra el c&aacute;ncer cervical.<SUP>52 </SUP>De igual manera, diversas v&iacute;as    y veh&iacute;culos de inmunizaci&oacute;n se han utilizado en diversos modelos    tumorales murinos asociados al VPH (<a href="#qdr03">cuadro III</a>).</font></p>     <p><a name="qdr03"></a></p>     <p>&nbsp;</p>     <p align="center"><img src="/img/revistas/spm/v47n6/a11qdr03.gif"></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana"><I>Interferones</I>: Los interferones son las    citocinas m&aacute;s estudiadas como tratamiento para el c&aacute;ncer cervical.    Esta familia de citocinas tiene propiedades antivirales, antiproliferativas    e inmunomoduladoras.<SUP>53 </SUP>Las lesiones cervicales asociadas al VPH y    que se tratan con interfer&oacute;n recombinante pueden eliminar el virus y,    en algunos casos, la infecci&oacute;n latente. Sin embargo, el tratamiento con    los IFN-<font face="Symbol">a</font> y <font face="Symbol">g</font> recombinantes    en pacientes con neoplasias intraepiteliales cervicales (NICs) y en carcinomas    cervicales bien establecidos, han generado resultados muy inconsistentes y su    eficacia ha sido controversial.<SUP>54-56 </SUP>Es probable que estos resultados    sean dependientes de los subtipos del interfer&oacute;n utilizados. El IFN-<font face="Symbol">b</font>    es m&aacute;s efectivo que el IFN-<font face="Symbol">a</font> y generalmente    el IFN-<font face="Symbol">g</font> es el que tiene mayor efectividad contra    neoplasias. Asimismo, la actividad t&oacute;xica del IFN-<font face="Symbol">b</font>    es muy alta comparada con drogas quimoterap&eacute;uticas, como el cisplatino,    taxol y gemcitabine.<SUP>57 </SUP>As&iacute;, reiteradamente, la  terapia    g&eacute;nica local con IFN-<font face="Symbol">b</font> tiene una amplia aplicaci&oacute;n    en la cl&iacute;nica en pacientes con c&aacute;ncer.<SUP>58 </SUP>No obstante,    respecto a la terapia g&eacute;nica con interfer&oacute;n para el tratamiento    del c&aacute;ncer cervical, hasta este momento s&oacute;lo se ha demostrado    el uso del IFN-<font face="Symbol">b</font> en terapia g&eacute;nica en ratones    desnudos, en un modelo tumoral generado con el uso de una l&iacute;nea celular    de carcinoma cervical (ME180). En este modelo se demuestra que el uso de adenovirus    recombinantes que expresan el gen de IFN-<font face="Symbol">b</font> es capaz    de disminuir el desarrollo tumoral y la sobrevida de los ratones con tumor.<SUP>59</SUP></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><I>Interleucina 2</I>: La IL-2 es un potente    activador de los linfocitos T, activa a las c&eacute;lulas NK, a los macr&oacute;fagos,    a los linfocitos B y estimula la liberaci&oacute;n de varias citocinas. Su efecto    antitumoral es mediado por promover la activaci&oacute;n de las c&eacute;lulas    NK, c&eacute;lulas asesinas activadas por linfocinas (LAK) y otras c&eacute;lulas    citot&oacute;xicas, as&iacute; como la inducci&oacute;n de IFN-<font face="Symbol">g</font>,    TNF-<font face="Symbol">a</font>.<SUP>60 </SUP>El uso de la IL-2 en terapia    g&eacute;nica contra c&aacute;ncer se ha empleado ampliamente en diversos modelos    tumorales precl&iacute;nicos, incluyendo el carcinoma hepatocelular,<SUP>61</SUP>    carcinoma de cabeza y cuello,<SUP>62 </SUP>sarcomas,<SUP>63 </SUP>plasmocitoma,<SUP>64    </SUP>carcinoma de mama,<SUP>65 </SUP>linfomas,<SUP>66 </SUP>y en c&aacute;ncer    cervical.<SUP>67 </SUP>Particularmente, el efecto adyuvante de la IL-2 en c&aacute;ncer    cervical se ha probado en modelos tumorales asociados al VPH. Se ha demostrado    que el tratamiento con la prote&iacute;na recombinante y con el gen de IL-2,    administrados por v&iacute;a intratumoral, reduce significativamente el avance    de los tumores asociados al VPH e inhibe la formaci&oacute;n de tumores recurrentes    despu&eacute;s de ser eliminados por cirug&iacute;a.<SUP>67,68 </SUP>Por otro    lado, en diversos modelos tumorales asociados al VPH, el desarrollo tumoral    genera met&aacute;stasis a pulm&oacute;n y a n&oacute;dulos linfoides. Sin embargo,    el tratamiento basado en terapia g&eacute;nica con IL-2, administrada v&iacute;a    peritumoral, reduce el tama&ntilde;o del volumen del tumor y el n&uacute;mero    de met&aacute;stasis; y este efecto es dependiente de la expresi&oacute;n de    mol&eacute;culas MHC clase I por la propia c&eacute;lula tumoral.<SUP>69 </SUP>Adem&aacute;s,    se ha sugerido el tratamiento adicional con IFN-<font face="Symbol">g</font>,    para favorecer la expresi&oacute;n de las mol&eacute;culas de MHC clase I y    potenciar el efecto protector.<SUP>70 </SUP>Este mismo efecto protector se ha    observado con la combinaci&oacute;n de IL-12,<SUP>71 </SUP>y con el GM-CSF.<SUP>72,73    </SUP>El mecanismo de inhibici&oacute;n del desarrollo tumoral por IL-2 se ha    determinado por la capacidad para promover el infiltrado de los linfocitos T    y c&eacute;lulas NKs al sitio del tumor,<SUP>74 </SUP>lo que aumenta el nivel    de actividad l&iacute;tica.<SUP>75 </SUP>Adem&aacute;s, la presencia de IL-2    favorece la expresi&oacute;n de las subunidades <font face="Symbol">b</font>    y <font face="Symbol">g</font> del receptor de IL-2 en c&eacute;lulas tumorales    asociadas a VPH, las cuales se requieren para los eventos de traducci&oacute;n    de se&ntilde;ales.<SUP>76</SUP> </font></p>     <p><font size="2" face="Verdana"><I>GM-CSF</I>: El factor estimulador de colonias    de granulocitos-monocitos es un potente activador de la respuesta inmune antitumoral    y se ha probado mediante terapia g&eacute;nica en diferentes modelos tumorales    en animales y en ensayos cl&iacute;nicos en humanos.<SUP>77-78 </SUP> </font></p>     <p><font size="2" face="Verdana"> El uso del GM-CSF como adyuvante en la terapia    g&eacute;nica contra c&aacute;ncer cervical ha sido probado mediante el dise&ntilde;o    <I>ex vivo </I>de l&iacute;neas celulares tumorales, transformadas con las prote&iacute;nas    de VPH y transfectadas con el gen de GM-CSF.<SUP>79 </SUP>El tratamiento en    modelos tumorales en rat&oacute;n asociados al VPH y con la terapia g&eacute;nica    <I>ex vivo </I>ha permitido determinar que el GM-CSF es capaz de inhibir el    desarrollo tumoral de una manera dosis dependiente.<SUP>80</SUP> Adem&aacute;s,    el tratamiento en conjunto de GM-CSF y la IL-2 aumenta la protecci&oacute;n    contra tumores recurrentes despu&eacute;s de ser eliminados por cirug&iacute;a    e inhibe la formaci&oacute;n de met&aacute;stasis, las cuales no son inhibidas    tan s&oacute;lo con el tratamiento con el GM-CSF.<SUP>73 </SUP>Se ha determinado    que el efecto antitumoral del GM-CSF es dependiente del reclutamiento de APCs    al sitio de inmunizaci&oacute;n, como las CD, las cuales son consideradas como    las m&aacute;s eficientes c&eacute;lulas inmuno-estimuladoras que presentan    ant&iacute;geno, y son capaces de activar a los linfocitos T CD4<SUP>+</SUP>    y CD8<SUP>+</SUP> ant&iacute;geno-espec&iacute;ficos.<SUP>78 </SUP>En este sentido,    el efecto antitumoral del GM-CSF en la terapia g&eacute;nica contra el c&aacute;ncer    cervical es dependiente del resto de los ant&iacute;genos virales del VPH, principalmente    por las oncoprote&iacute;nas E6 y E7. Por lo tanto, el tratamiento con el GM-CSF    y la inmunizaci&oacute;n con los oncogenes E6 y E7 potencializa la respuesta    de los linfocitos T CD8<SUP>+</SUP> citot&oacute;xicos ant&iacute;geno-espec&iacute;ficos    contra E6/E7 y la protecci&oacute;n antitumoral en tumores que expresan los    mismos ant&iacute;genos.<SUP>81,82 </SUP> </font></p>     <p><font size="2" face="Verdana"><I>Interleucina 12:</I> La IL-12 es una citocina    que por sus propiedades como inmunomodulador de la respuesta celular y de la    actividad antitumoral se ha usado ampliamente en la terapia g&eacute;nica en    diversos tumores murinos. Se han demostrado sus efectos en la inhibici&oacute;n    del avance del tumor y reducci&oacute;n del n&uacute;mero de met&aacute;stasis    experimentales.<SUP>83-85 </SUP>Es probable que la IL-12 sea una de las citocinas    que m&aacute;s se usa como terapia g&eacute;nica contra el c&aacute;ncer cervical.    Su efecto adyuvante se ha demostrado en diversos modelos animales con tumor    asociados al VPH. El tratamiento con el gen de IL-12 se ha empleado usando la    terapia g&eacute;nica no viral (DNA desnudo),<SUP>86,87 </SUP>terapia g&eacute;nica    viral con el uso de adenovirus,<SUP>88 </SUP>terapia g&eacute;nica <I>ex vivo</I>,<SUP>89    </SUP>y en combinaci&oacute;n con los oncogenes E6 y E7,<SUP>87,88 </SUP>as&iacute;    como con genes de mol&eacute;culas inmunomoduladoras de la respuesta inmune    celular como B7.<SUP>89 </SUP>El efecto de represi&oacute;n del crecimiento    tumoral se observa en todos los casos. Adem&aacute;s, la IL-12 es capaz de inhibir    la formaci&oacute;n de met&aacute;stasis experimentales y se considera como    un buen candidato para el tratamiento basado en la terapia g&eacute;nica contra    el c&aacute;ncer cervical. El efecto antitumoral de IL-12 es dependiente de    la activaci&oacute;n y proliferaci&oacute;n de los linfocitos T CD8<SUP>+</SUP>    citot&oacute;xicos,<SUP>88 </SUP>y del aumento en la producci&oacute;n de IFN-<font face="Symbol">g</font>    en el sitio de inmunizaci&oacute;n, el cual es producto de la activaci&oacute;n    de las c&eacute;lulas NK.<SUP>84,88 </SUP>Adicionalmente, el uso de IL-12 en    la terapia g&eacute;nica contra el c&aacute;ncer cervical se ha empleado en    conjunto con otras citocinas como el GM-CSF e IL-2, donde ocurre un aumento    del efecto protector contra el avance del tumor.<SUP>90 </SUP>Sin embargo, el    mejor efecto adyuvante se ha observado por la administraci&oacute;n peritumoral    de IL-12 y el GM-CSF. </font></p>     <p><font size="2" face="Verdana"> De igual manera, se han probado diferentes combinaciones    de citocinas como terapia g&eacute;nica en modelos tumorales experimentales    asociados al VPH. La administraci&oacute;n de IL-2 y el GM-CSF en conjunto inhiben    el desarrollo tumoral y la formaci&oacute;n de tumores residuales despu&eacute;s    de la cirug&iacute;a o quimioterapia en sistemas experimentales. No obstante,    el tratamiento &uacute;nicamente con GM-CSF no tiene capacidad de inhibir la    met&aacute;stasis a pulm&oacute;n, y se requiere de IL-12 para inhibir este    proceso.<SUP>73 </SUP>Se ha demostrado que el tratamiento simult&aacute;neo    con IL-2, IFN-<font face="Symbol">g</font> y GM-CSF en un modelo tumoral experimental    asociado al VPH-16, inhibe la formaci&oacute;n de tumores recurrentes y no se    detectan diferencias en la actividad citot&oacute;xica de los linfocitos T CD8<SUP>+</SUP>    del bazo.<SUP>67 </SUP>Por otro lado, la terapia g&eacute;nica con citocinas    como tratamiento para el c&aacute;ncer cervical ha sido probada en conjunto    con terapias combinadas, usando RNA antisentido para E7,<SUP>90</SUP> ant&iacute;genos    de VPH,<SUP>82,88,91</SUP> terapia g&eacute;nica suicida,<SUP>72,92 </SUP>citocinas    recombinantes<SUP>73</SUP> y mol&eacute;culas coestimuladoras de la respuesta    inmune celular como B7-1 y B7-2.<SUP>89,92</SUP></font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Conclusiones </b></font></p>     <p><font size="2" face="Verdana">En la actualidad el tratamiento contra diferentes    enfermedades oncol&oacute;gicas ha evolucionado a pasos muy acelerados. Esto    ha sido posible gracias a la influencia de la ingenier&iacute;a gen&eacute;tica    y de la gen&oacute;mica en la medicina, que han permitido cambiar la perspectiva    de los tratamientos y terapias contra las neoplasias. En este sentido, la terapia    g&eacute;nica es una herramienta muy &uacute;til en la biomedicina moderna y,    gracias a la capacidad de transferencia de DNA para corregir la acci&oacute;n    de un gen alterado y favorecer la activaci&oacute;n de la respuesta inmune,    tiene un potencial enorme para el tratamiento, prevenci&oacute;n o eliminaci&oacute;n    de algunos tipos de c&aacute;ncer. </font></p>     <p><font size="2" face="Verdana"> Recientemente, las investigaciones en torno    al tratamiento de las neoplasias est&aacute;n enfocadas principalmente en conocer    el origen del c&aacute;ncer, las alteraciones celulares generadas durante la    evoluci&oacute;n tumoral y los mecanismos moleculares de la evasi&oacute;n de    la respuesta inmune. Este conocimiento en conjunto con la biomedicina han permitido    plantear el uso de nuevos f&aacute;rmacos, prote&iacute;nas o el uso del DNA    para controlar y/o corregir los defectos celulares, as&iacute; como activar    la respuesta inmune para eliminar a la c&eacute;lula tumoral. </font></p>     <p><font size="2" face="Verdana"> De esta manera, las citocinas son excelentes    candidatos para inhibir el avance del c&aacute;ncer, ya que son consideradas    como mol&eacute;culas inmunoreguladoras que promueven la maduraci&oacute;n,    activaci&oacute;n y migraci&oacute;n de las c&eacute;lulas efectoras de la respuesta    inmune al sitio de la neoplasia. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"> En particular, en el c&aacute;ncer cervical,    la terapia g&eacute;nica con citocinas promete ser una buena alternativa para    corregir y controlar varias alteraciones de la respuesta inmune que se desarrollan    en el microambiente tumoral de las pacientes con c&aacute;ncer. La presencia    de las citocinas IL-10 y TGF-<font face="Symbol">b</font>1 ejerce un efecto    de evasi&oacute;n e inhibici&oacute;n de la respuesta inmune, lo que puede controlarse    con el uso de terapia g&eacute;nica con citocinas. El IFN-<font face="Symbol">g</font>,    IL-2, IL-12 y GM-CSF son excelentes candidatos como activadores de la respuesta    inmune antitumoral y se han empleado en diversos modelos precl&iacute;nicos    con alta efectividad, pues con ellos se ha reducido la masa tumoral, el n&uacute;mero    de met&aacute;stasis experimentales y en algunos casos eliminado el tumor completo.    Adicionalmente, es posible utilizar la terapia g&eacute;nica con citocinas en    combinaci&oacute;n con quimiocinas, con ant&iacute;genos espec&iacute;ficos    de tumor, con mol&eacute;culas coactivadoras, con adyuvantes y con el uso de    diversos veh&iacute;culos como acarreadores de los genes terap&eacute;uticos.    En conclusi&oacute;n, este escenario permite proponer a la terapia g&eacute;nica    con citocinas como una excelente estrategia para el tratamiento del c&aacute;ncer    cervical.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Agradecimientos</b></font></p>     <p><font size="2" face="Verdana">Victor Hugo Berm&uacute;dez Morales y Oscar Peralta    Zaragoza son becarios del CONACyT con los n&uacute;meros de expedientes 125098    y 117983, respectivamente. </font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana"><b>Referencias</b></font></p>     <!-- ref --><p><font size="2" face="Verdana">1. Smith KR. 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<body><![CDATA[<p><font size="2" face="Verdana"><b>Solicitud de sobretiros:</b>    <br>   Vicente Madrid Marina    <br>   Director de Biolog&iacute;a Molecular de Pat&oacute;genos    <br>   Instituto Nacional de Salud P&uacute;blica    <br>   Avenida Universidad 655    <br>   colonia Santa Mar&iacute;a Ahuacatitl&aacute;n    <br>   62502, Cuernavaca, Morelos, M&eacute;xico    <br>   Correo electr&oacute;nico: <a href="mailto:vmarina@correo.insp.mx">vmarina@correo.insp.mx</a></font></p>     <p><font size="2" face="Verdana">Fecha de recibido: 31 de mayo de 2005    <br>   Fecha de aprobado: 28 de octubre de 2005 </font></p>     ]]></body>
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