<?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>S1870-01952013000100010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[¿Qué sabe Ud. acerca de ... las vacunas de ADN?]]></article-title>
<article-title xml:lang="en"><![CDATA[What do you know about ... DNA vaccines?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Monteon]]></surname>
<given-names><![CDATA[Aracely]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hurtado Melgoza]]></surname>
<given-names><![CDATA[María de Lourdes]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramos Ligonio]]></surname>
<given-names><![CDATA[Angel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Veracruzana Facultad de Ciencias Químicas Laboratorio de Docencia, Investigación y de Servicios Inmunología y Biología Molecular]]></institution>
<addr-line><![CDATA[Orizaba Veracruz]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2013</year>
</pub-date>
<volume>44</volume>
<numero>1</numero>
<fpage>79</fpage>
<lpage>81</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-01952013000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-01952013000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-01952013000100010&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Secciones</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>&iquest;Qu&eacute; sabe Ud. acerca de ... las vacunas de ADN?</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>What do you know about ... DNA vaccines?</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Aracely L&oacute;pez Monteon, Mar&iacute;a de Lourdes Hurtado Melgoza y Angel Ramos Ligonio</b></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	     <p align="justify"><font face="verdana" size="2"><i>LADISER Inmunolog&iacute;a    y Biolog&iacute;a Molecular, Facultad de Ciencias Qu&iacute;micas, Universidad    Veracruzana Centro de Investigaciones Biom&eacute;dicas, Universidad Veracruzana.</i></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>Preguntas</b></font></p>  	    <p align="justify"><font face="verdana" size="2">1. &iquest;Cu&aacute;l es la estructura de las vacunas de ADN?</font></p>  	    <p align="justify"><font face="verdana" size="2">2. &iquest;En qu&eacute; casos se podr&iacute;an utilizar las vacunas de ADN?</font></p>  	    <p align="justify"><font face="verdana" size="2">3. &iquest;Cu&aacute;les son las rutas y formas de inoculaci&oacute;n?</font></p>  	    <p align="justify"><font face="verdana" size="2">4. &iquest;Cu&aacute;l es el mecanismo de inducci&oacute;n de la respuesta inmune que utilizan las vacunas de ADN?</font></p>  	    <p align="justify"><font face="verdana" size="2">5.&nbsp;&iquest;Cu&aacute;les son las ventajas y desventajas de las vacunas de ADN con relaci&oacute;n a las vacunas convencionales?</font></p>  	    <p align="justify"><font face="verdana" size="2">6.&nbsp;&iquest;Cu&aacute;les son las aplicaciones de las vacunas de ADN?</font></p>  	    <p align="justify">&nbsp;</p> 	    <p align="justify"><font face="verdana" size="2"><b>Respuestas</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">1.&nbsp;Las vacunas de ADN est&aacute;n compuestas por un pl&aacute;smido bacteriano o tambi&eacute;n llamado vector en el cual se ha insertado una secuencia de ADN que codifica para un ant&iacute;geno de inter&eacute;s o prote&iacute;na. Los pl&aacute;smidos bacterianos son mol&eacute;culas de ADN circular que se autorreplican fuera del n&uacute;cleo y se obtienen mediante su introducci&oacute;n en bacterias competentes como <i>E. coli</i> previamente tratadas con una mezcla de cationes divalentes que las hacen permeables temporalmente a peque&ntilde;as mol&eacute;culas de ADN. La peque&ntilde;a poblaci&oacute;n de bacterias que adquieren el pl&aacute;smido es identificada mediante marcadores selectivos que confieren resistencia a antibi&oacute;ticos. Por esta raz&oacute;n, los pl&aacute;smidos tienen adem&aacute;s diversos genes de resistencia a antibi&oacute;ticos, como la ampicilina (Amp) o la Kanamicina (Kan), (<a href="#f1">Figura 1</a>).<sup>1&#45;2</sup></font></p>  	    <p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>  	    <p align="center"><font face="verdana" size="2"><img src="../img/revistas/rmcf/v44n1/a10f1.jpg"></font></p>  	    <p align="justify"><font face="verdana" size="2">2. La mayor&iacute;a de las vacunas que est&aacute;n en uso actualmente son dirigidas contra pat&oacute;genos que pueden ser controlados eficazmente con anticuerpos. Sin embargo, un gran n&uacute;mero de pat&oacute;genos han desarrollado una multitud de estrategias de escape y mecanismos de resistencia a la actividad l&iacute;tica de los anticuerpos y han frustrado los esfuerzos en el desarrollo de vacunas, lo que significa que para su eliminaci&oacute;n se requiere de la activaci&oacute;n de ciertas poblaciones espec&iacute;ficas de linfocitos T, en este sentido las vacunas de ADN representan una de las estrategias novedosas para lograr la activaci&oacute;n de tal respuesta inmune celular.<sup>3&#45;4</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">3. La respuesta a las vacunas de ADN ha sido determinada mediante diferentes rutas de inoculaci&oacute;n, incluyendo intramuscular, intrad&eacute;rmica, intravenosa, intraperitoneal, epid&eacute;rmica mediante escarificaci&oacute;n de la piel, oral, intranasal y vaginal. De todas estas formas, las que han dado mejores resultados y m&aacute;s reproducibles son la inoculaci&oacute;n intramuscular y en los diferentes estratos de la piel mediante agujas hipod&eacute;rmicas, as&iacute; como el bombardeo de part&iacute;culas mediante pistolas gen&eacute;ticas en piel y en mucosas. En la selecci&oacute;n del m&eacute;todo a emplear hay que tomar en cuenta dos consideraciones importantes: la cantidad de ADN a inocular y las caracter&iacute;sticas de la respuesta inmune que se desea obtener. La administraci&oacute;n de vacunas mediante agujas posee la ventaja de ser un m&eacute;todo barato, aunque requiere de 100 a 1000 veces m&aacute;s ADN que el bombardeo de part&iacute;culas para inducir una respuesta inmune.<sup>5</sup> El bombardeo de part&iacute;culas con pistola de genes tiende a inducir una respuesta T cooperadora de tipo Th2 que sirve para combatir infecciones parasitarias y en mucosas, mientras que las inyecciones intramusculares desv&iacute;an la respuesta cooperadora hacia Th1 en la que se activa la respuesta celular lo que permite el control de infecciones bacterianas intracelulares y virales.<sup>6</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">4. Las vacunas de ADN se basan en la inyecci&oacute;n directa en el hu&eacute;sped de un pl&aacute;smido que codifica para un ant&iacute;geno de un pat&oacute;geno, en lugar del ant&iacute;geno proteico o del pat&oacute;geno atenuado o muerto. Al ser las c&eacute;lulas del paciente las que producen la prote&iacute;na, el ant&iacute;geno no contiene impurezas, al contrario de lo que sucede con las vacunas tradicionales, en donde durante el proceso de purificaci&oacute;n pueden quedar trazas de antibi&oacute;ticos o prote&iacute;nas del medio de cultivo. La expresi&oacute;n del ant&iacute;geno dentro de las c&eacute;lulas del hu&eacute;sped puede inducir una respuesta inmune completa y duradera que incluye anticuerpos, aunque es frecuentemente m&aacute;s d&eacute;bil que la que se puede obtener con vacunas recombinantes, as&iacute; como una activaci&oacute;n fuerte y duradera de c&eacute;lulas T cooperadoras y citot&oacute;xicas o de respuesta celular. Un aspecto que a&uacute;n no se comprende del todo consiste en la interacci&oacute;n de la vacuna de ADN con el sistema inmune. Las cantidades del ant&iacute;geno que se producen cuando se administra el pl&aacute;smido est&aacute;n en el orden de los pico o nano gramos. Estos niveles relativamente peque&ntilde;os de ant&iacute;geno hacen pensar que la respuesta inmune tan fuerte y sostenida se debe al tipo de c&eacute;lulas que capturan el ADN, ya que es necesario que c&eacute;lulas especializadas llamadas c&eacute;lulas presentadoras de ant&iacute;geno (CPA) capturen el ant&iacute;geno lo procesen y lo presenten a otras c&eacute;lulas del sistema inmune como los linfocitos T.<sup>3,7</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">5.&nbsp;Las vacunas de ADN ofrecen una serie de ventajas sobre las tecnolog&iacute;as ya existentes para la producci&oacute;n de las vacunas. Ellas estimulan tanto la respuesta inmune humoral como la celular y a diferencia de las vacunas con microorganismos recombinantes no hay respuesta inmune hacia el vector lo cual permite su utilizaci&oacute;n de manera repetida. Ahora bien, debido a que no se administran microorganismo vivos pueden emplearse en individuos inmunocomprometidos y mujeres embarazadas e incluso en individuos sanos sin posibilidad de reversi&oacute;n a la forma virulenta del microorganismo.<sup>8</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">La elaboraci&oacute;n de las vacunas tradicionales requieren de una infraestructura costosa, por lo que las formas alternativas que puedan reducir este precio son siempre deseables. Ventajas de otro tipo incluyen la estabilidad de los vectores a diferentes temperaturas, lo cual permite disminuir costos en el proceso de elaboraci&oacute;n, transporte y administraci&oacute;n debido a que no se requiere una "cadena fr&iacute;a" o serie de refrigeradores para mantener la estabilidad de la vacuna.<sup>9</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">6.&nbsp;Las vacunas de ADN han sido probadas en diferentes patolog&iacute;as virales y bacterianas.<sup>10</sup> Existen algunas vacunas que se encuentran en fase I, tal es el caso de vacunas contra el VIH,<sup>11</sup> VPH,<sup>12</sup> c&aacute;ncer de pr&oacute;stata,<sup>13</sup> hepatitis B<sup>14</sup> y contra la malaria.<sup>15</sup> Otras patolog&iacute;as que ya se incluyen dentro del repertorio de la vacunaci&oacute;n con ADN incluyen las parasitarias (<i>Trypanosoma, Leishmania</i>, etc.).<sup>16,17</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">La capacidad que las vacunas de ADN tienen para inducir respuestas celulares ha hecho que su aplicaci&oacute;n sea principalmente hacia infecciones virales y las producidas por bacterias intracelulares. Esta nueva generaci&oacute;n de vacunas ha abierto nuevos campos para la prevenci&oacute;n y tratamiento de enfermedades en las que la vacunaci&oacute;n no formaba parte del repertorio empleado para el tratamiento como el c&aacute;ncer (c&aacute;ncer de mama) y las enfermedades autoimnunes (diabetes).<sup>18</sup></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>Referencias</b><br clear="all"></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. Srivastava IK, Liu MA. Gene vaccines. Ami Intern Med 2003; 138:550&#45;559.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7914375&pid=S1870-0195201300010001000001&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. Mateen I, Irshad S. A review on DNA vaccines. Journal of Health Sciences. 2011; 1:1&#45;7.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7914377&pid=S1870-0195201300010001000002&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. Donnelly JJ, Wahren B, Liu MA. DNA vaccines: progress and challenges. J Immunol. 2005; 175:633&#45;635.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7914379&pid=S1870-0195201300010001000003&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">4. Seder RA, Hill AVS. Vaccine against intracellular infections requiring cellular immunity. Nature. 2000; 406:793&#45;798.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=7914381&pid=S1870-0195201300010001000004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	     ]]></body>
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