<?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>1688-0390</journal-id>
<journal-title><![CDATA[Revista Médica del Uruguay]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Méd. Urug.]]></abbrev-journal-title>
<issn>1688-0390</issn>
<publisher>
<publisher-name><![CDATA[Sindicato Médico del Uruguay]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-03902009000300007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Trasplante de células miogénicas: medicina regenerativa en patologías del músculo esquelético y cardíac]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Daniel Skuk]]></surname>
<given-names><![CDATA[MD]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Laval. Facultad de Medicina. Departamento de Anatomía y Fisiología.]]></institution>
<addr-line><![CDATA[Quebec ]]></addr-line>
<country>Canadá</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>25</volume>
<numero>3</numero>
<fpage>181</fpage>
<lpage>197</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-03902009000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-03902009000300007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-03902009000300007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El trasplante de células con capacidad miogénica es una estrategia experimental de medicina regenerativa. Explorada en sus comienzos como una herramienta terapéutica en el manejo de miopatías, su extrapolación al tratamiento potencial del infarto de miocardio cobra hoy mayor expansión. El presente trabajo, basado en la bibliografía y en la experiencia del autor durante más de una década dedicada a la investigación clínica y preclínica en ese terreno, pretende realizar una breve puesta al día de un tema que puede cobrar gran importancia en la medicina del presente siglo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Summary Miogenic cells transplantions is an experimental technique in regenerative medicine. Intitially explored as a therapeutic tool in the treatment of myopathies, its extrapolation for the potential treatment of myocardial infarction currently spreads its scope of application. This study, based on bibliography and the author&rsquo;s experience during over a decade of clinical and preclinical research in the field, attempts to provide an update in a highly important topic for this century&rsquo;s medicine.]]></p></abstract>
<abstract abstract-type="short" xml:lang="fr"><p><![CDATA[Résumé La greffe de cellules à capacité myogénique est une stratégie expérimentale de médecine régénérative. Considérée au début comme un outil thérapeutique dans le traitement des myopathies, son usage au traitement potentiel de l&rsquo;infarctus du myocarde est plus large de nos jours. Ce rapport, basé sur la bibliographie et l&rsquo;expérience de l&rsquo;auteur récoltée pendant plus d&rsquo;une décennie consacrée à la recherche clinique et préclinique, prétend faire une brève mise à la page d&rsquo;un sujet qui est censé avoir une grande incidence sur la médecine de ce siècle.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo O transplante de células com capacidade miogênica é uma estratégia experimental da medicina regenerativa. Explorada a principio como uma ferramenta terapêutica no manejo das miopatias, sua extrapolação ao tratamento potencial do infarto de miocárdio possibilitou uma maior expansão. Este trabalho, baseado na bibliografia e na experiência do autor durante mais de uma década dedicada à pesquisa clínica e pré-clínica nessa área, pretende realizar una breve atualização de um tema que pode ter grande importância na medicina deste século.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Trasplante de Células]]></kwd>
<kwd lng="es"><![CDATA[Mioblastos - trasplante]]></kwd>
<kwd lng="es"><![CDATA[Infarto del Miocardio - terapia]]></kwd>
<kwd lng="en"><![CDATA[Cell Transplantation]]></kwd>
<kwd lng="en"><![CDATA[Myoblasts - transplantation]]></kwd>
<kwd lng="en"><![CDATA[Myocardial Infarction - therapy]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[         <b><font face="Verdana" size="4"><span lang="ES-MODERN">     <p>Trasplante de c&eacute;lulas miog&eacute;nicas: medicina regenerativa en patolog&iacute;as del m&uacute;sculo esquel&eacute;tico y card&iacute;aco</p>       </span></font></b>     <p align="justify"></p>       <i><font face="Verdana" size="2"><span lang="EN">     <p align="right"><a name="1.-"></a>Daniel Skuk, MD.<a href="#asterisco">*</a></p>       </span></font></i>     <p align="justify"></p>           <p align="justify"><font size="2" face="Verdana">&nbsp;</font></p>       <b><font face="Verdana" size="2"><span lang="ES-MODERN">     <p align="right">Unidad de Investigaci&oacute;n en Gen&eacute;tica Humana, Centro de Investigaci&oacute;n del Centro Hospitalario de la Universidad Laval, Quebec, Canad&aacute;</p>       </span></font></b>     <p align="right"></p>           <p align="right"><b><font face="Verdana" size="2">&nbsp;</font></b></p>      <dir> <dir>      <p align="justify"><b><font face="Verdana" size="2">Resumen</font></b></p>           ]]></body>
<body><![CDATA[<p align="justify"><i><font size="2" face="Verdana">El trasplante de c&eacute;lulas con capacidad miog&eacute;nica es una estrategia experimental de medicina regenerativa. Explorada en sus comienzos como una herramienta terap&eacute;utica en el manejo de miopat&iacute;as, su extrapolaci&oacute;n al tratamiento potencial del infarto de miocardio cobra hoy mayor expansi&oacute;n. El presente trabajo, basado en la bibliograf&iacute;a y en la experiencia del autor durante m&aacute;s de una d&eacute;cada dedicada a la investigaci&oacute;n cl&iacute;nica y precl&iacute;nica en ese terreno, pretende realizar una breve puesta al d&iacute;a de un tema que puede cobrar gran importancia en la medicina del presente siglo.</font></i></p>            <p><font size="2"><font face="Verdana"><b>Palabras clave:</b></font><i><font face="Verdana"> Trasplante de C&eacute;lulas.</font></i></font></p>           <p><font size="2" face="Verdana"><i>	Mioblastos - trasplante.</i></font></p>           <p><font size="2" face="Verdana"><i>	Infarto del Miocardio - terapia.</i></font></p>       <font size="2"><b> <span lang="EN">     <p><font face="Verdana">Keywords: <i>	Cell Transplantation.</i></font></p>           <p><font face="Verdana"><i>	Myoblasts &ndash; transplantation.</i></font></p>           <p><font face="Verdana"><i>	Myocardial Infarction - therapy.</i></font></p>       </span></b></font><b><font face="Humanst521 BT,Lucida Sans Unicode" size="1">     <p align="right"></p>      </font></b></dir>       </dir>        <b><font size="2"><span lang="ES-MODERN">     <p align="justify"><font face="Verdana"><a name="asterisco"></a><a href="#1.-">*</a> Profesor Asociado al Departamento de Anatom&iacute;a y Fisiolog&iacute;a de la Facultad de Medicina de la Universidad Laval, Quebec, Canad&aacute;.</font></p>           <p align="justify"><font face="Verdana">Correspondencia: Daniel Skuk, MD.</font></p>           ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana">Unit&eacute; de recherche en G&eacute;n&eacute;tique humaine (RC9300) </font> </p>           <p align="justify"><font face="Verdana">Centre de recherche du Centre hospitalier de l&rsquo;Universit&eacute; Laval </font> </p>           <p align="justify"><font face="Verdana">2705, boulevard Laurier, Qu&eacute;bec, QC, G1V4G2, Canada</font></p>           <p align="justify"><font face="Verdana">Correo electr&oacute;nico: <a href="mailto:Daniel.Skuk@anm.ulaval.ca">Daniel.Skuk@anm.ulaval.ca</a></font></p>           <p align="justify"><font face="Verdana">Recibido: 13/4/09.</font></p>           <p align="justify"><font face="Verdana">Aceptado: 20/7/09.</font></p>       </span></font></b>     <p align="justify"></p>       <b><font size="2">     <p align="justify">&nbsp;</p>       </font><font face="Verdana" size="2">     <p align="justify">Introducci&oacute;n</p>       </font></b>     <p align="justify"></p>           ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana"><b><font size="2">El trasplante de c&eacute;lulas miog&eacute;nicas implica el implante en un organismo de c&eacute;lulas capaces de formar m&uacute;sculo estriado. Es una estrategia en fase experimental destinada en su mayor parte al tratamiento de patolog&iacute;as del m&uacute;sculo esquel&eacute;tico y card&iacute;aco. Los estudios m&aacute;s numerosos realizados a nivel precl&iacute;nico y cl&iacute;nico se han focalizado esencialmente en el tratamiento de dos entidades, y en ellas se centrar&aacute; el presente trabajo: las distrofias musculares (fundamentalmente las recesivas o ligadas al cromosoma X)(<a name="1-2.--"></a><a href="#1">1</a>,<a href="#2">2</a>) y el infarto de miocardio(<a name="3.--"></a><a href="#3">3</a>). Otras afecciones podr&iacute;an agregarse a las anteriores, si bien hasta ahora han merecido pocos estudios(<a name="4.--"></a><a href="#4">4</a>). Sin embargo, corresponde destacar la incontinencia urinaria por deficiencias del esf&iacute;nter externo, tanto por su frecuencia como por el hecho de que ha merecido ya alg&uacute;n ensayo cl&iacute;nico(<a name="5.--"></a><a href="#5">5</a>).</font></b></font></p>           <p align="justify"><font face="Verdana"><b><font size="2">El uso del trasplante de c&eacute;lulas miog&eacute;nicas en medicina fue propuesto en 1978 por Partridge, Grounds y Sloper, quienes sugirieron que "en pacientes portadores de miopat&iacute;as hereditarias recesivas, la funci&oacute;n muscular podr&iacute;a ser restaurada si se lograra que mioblastos normales fusionaran con las fibras musculares patol&oacute;gicas"(<a name="6.--"></a><a href="#6">6</a>). Estos autores se refer&iacute;an al implante de mioblastos, las c&eacute;lulas mononucleadas precursoras del m&uacute;sculo esquel&eacute;tico.</font></b></font></p>           <p align="justify"></p>       <b><font face="Verdana" size="2">     <p align="justify">Trasplante de c&eacute;lulas en el m&uacute;sculo esquel&eacute;tico</p>       </font></b>     <p align="justify"></p>           <p align="justify"><b><font size="2" face="Verdana">Las propiedades potencialmente &uacute;tiles del trasplante celular para el tratamiento de patolog&iacute;as del m&uacute;sculo esquel&eacute;tico son tres: inducir la s&iacute;ntesis de prote&iacute;nas terap&eacute;uticas en las fibras musculares, regenerar tejido contr&aacute;ctil, y reponer la poblaci&oacute;n de c&eacute;lulas madre. </font></b></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>1) S&iacute;ntesis de prote&iacute;nas terap&eacute;uticas. </i>Al integrarse las c&eacute;lulas trasplantadas a las fibras musculares del receptor, la coexistencia de n&uacute;cleos del donante y del receptor en un mismo sincicio determina que se sinteticen all&iacute; prote&iacute;nas de ambos or&iacute;genes. Por este mecanismo, estas fibras musculares "h&iacute;bridas" pueden producir la prote&iacute;na cuyo d&eacute;ficit gen&eacute;tico causaba una miopat&iacute;a. En la distrofia muscular de Duchenne, miopat&iacute;a degenerativa de origen gen&eacute;tico ligada al cromosoma X, los pacientes sufren una p&eacute;rdida muscular progresiva debida al d&eacute;ficit de distrofina, una prote&iacute;na asociada a la membrana celular. Nuestro equipo demostr&oacute; recientemente que mediante la inyecci&oacute;n intramuscular de mioblastos de donantes normales, utilizando la t&eacute;cnica desarrollada por el autor, se obten&iacute;a sistem&aacute;ticamente la s&iacute;ntesis de la distrofina del donante en fibras musculares de estos pacientes(<a name="7-9.--"></a><a href="#7">7</a>-<a href="#9">9</a>) (<a href="/img/revistas/rmu/v25n3/3a07f1.gif">figura 1 C a H</a>). Los niveles de correcci&oacute;n molecular en nuestros ensayos cl&iacute;nicos variaron de 3% a 34,5% del tejido muscular en los sitios inyectados con mioblastos normales. Estos porcentajes dependieron esencialmente de: (a) variables t&eacute;cnicas en la inyecci&oacute;n de las c&eacute;lulas; (b) la calidad de las mismas, y (c) la presencia o no de rechazo inmunol&oacute;gico. </font></b></font></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>2) Generaci&oacute;n de nuevo tejido contr&aacute;ctil.</i> La capacidad de los mioblastos de rat&oacute;n para reconstituir el tejido muscular fue observada en casos de destrucci&oacute;n muscular aguda, severa e irreversible(<a name="10-11.--"></a><a href="#10">10</a>,<a href="#11">11</a>). En nuestra experiencia cl&iacute;nica hemos observado neoformaci&oacute;n de fibras musculares, si bien peque&ntilde;as, en pacientes que recibieron inyecciones intramusculares de mioblastos normales(<a href="#7">7</a>). Esta propiedad se intenta explotar cl&iacute;nicamente para el tratamiento de la incontinencia urinaria por deficiencias del esf&iacute;nter externo de la uretra(<a name="12.--"></a><a href="#12">12</a>). El principio de este tratamiento consiste en reforzar el esf&iacute;nter mediante el autotrasplante de c&eacute;lulas miog&eacute;nicas cultivadas a partir de una biopsia muscular realizada al propio paciente. Un ensayo cl&iacute;nico preliminar report&oacute; mejoras de la incontinencia urinaria en cinco de ocho mujeres tratadas de este modo, una de las cuales logr&oacute; continencia total(<a href="#5">5</a>).</font></b></font></p>           ]]></body>
<body><![CDATA[<p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>3) Reposici&oacute;n de c&eacute;lulas madre.</i> Estudios en ratones mostraron que los mioblastos trasplantados dan origen tambi&eacute;n a c&eacute;lulas sat&eacute;lite, las c&eacute;lulas madre espec&iacute;ficas del m&uacute;sculo esquel&eacute;tico(<a name="13-14.--"></a><a href="#13">13</a>,<a href="#14">14</a>). Nuestra experiencia cl&iacute;nica tambi&eacute;n sugiere que la misma propiedad ocurrir&iacute;a en el humano<a href="#7">(7</a>).</font></b></font></p>           <p align="justify"></p>       <b><font face="Verdana" size="2">     <p align="justify">Tipos celulares para el trasplante </p>       </font><font size="2">     <p align="justify"></p>           <p align="justify"><font face="Verdana">Una c&eacute;lula apta para trasplante puede ser una c&eacute;lula diferenciada o un precursor con la capacidad para diferenciarse en aquella. En el m&uacute;sculo esquel&eacute;tico, los elementos diferenciados del par&eacute;nquima no son aptos para el trasplante: las fibras musculares son largos sincicios posmit&oacute;ticos que no pueden ser proliferados en cultivo, ni aislados o implantados en forma adecuada. Lo m&aacute;s apropiado, entonces, es utilizar una c&eacute;lula precursora.</font></p>           <p align="justify"></p>       </font><i><font face="Verdana" size="2">     <p align="justify">C&eacute;lulas progenitoras del m&uacute;sculo esquel&eacute;tico</p>       </font></i></b>     <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">El m&uacute;sculo esquel&eacute;tico es uno de los tejidos altamente diferenciados que poseen capacidad regenerativa. Ello es posible gracias a la existencia de progenitores espec&iacute;ficos: las c&eacute;lulas sat&eacute;lites (<a href="/img/revistas/rmu/v25n3/3a07f1.gif">figura 1 A y B</a>). Las c&eacute;lulas sat&eacute;lites permanecen quiescentes en la periferia de las fibras musculares hasta que estas sufren un da&ntilde;o; en ese momento se activan y dividen generando mioblastos, los cuales proliferan y se fusionan para formar miotubos, elementos multinucleados alargados que aumentan de volumen hasta reconstituir las fibras musculares. Las c&eacute;lulas sat&eacute;lite son consideradas c&eacute;lulas madre, ya que se dividen en forma asim&eacute;trica(<a name="15-16.--"></a><a href="#15">15</a>,<a href="#16">16</a>), es decir, al dividirse generan elementos diferenciados al tiempo que mantienen el pool de c&eacute;lulas madre. </font></b> </font></p>           ]]></body>
<body><![CDATA[<p align="justify"><b><font size="2" face="Verdana"> Para la medicina regenerativa, la importancia de las c&eacute;lulas sat&eacute;lite reside en tres hechos: (a) se obtienen de un tejido accesible por un sencillo procedimiento bi&oacute;psico; (b) pueden ser aisladas f&aacute;cilmente mediante m&eacute;todos est&aacute;ndar de cultivo celular, y (c) proliferan f&aacute;cilmente in vitro como mioblastos (<a href="/img/revistas/rmu/v25n3/3a07f1.gif">figura 1 C y D</a>), manteniendo un fenotipo constante y pudiendo producir millones de c&eacute;lulas miog&eacute;nicas en relativamente poco tiempo. </font></b></p>           <p align="justify"></p>       <b><i><font face="Verdana" size="2">     <p align="justify">C&eacute;lulas de la m&eacute;dula &oacute;sea</p>       </font></i></b>     <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">Dos tipos celulares de la m&eacute;dula &oacute;sea han sido rotulados como c&eacute;lulas madre: las c&eacute;lulas madre hematopoy&eacute;ticas y un grupo de c&eacute;lulas estromales definidas como c&eacute;lulas madre mesenquimatosas. Si bien se report&oacute; la diferenciaci&oacute;n de c&eacute;lulas estromales en c&eacute;lulas musculares(<a name="17-18.--"></a><a href="#17">17</a>,<a href="#18">18</a>), la experiencia del autor en primates no humanos fue negativa(1). La observaci&oacute;n en cuanto a que c&eacute;lulas circulantes derivadas de la m&eacute;dula &oacute;sea fusionaban ocasionalmente con fibras musculares despert&oacute; cierta expectativa en el uso potencial de esta t&eacute;cnica para el tratamiento de las distrofias musculares(<a name="19-20.--"></a><a href="#19">19</a>,<a href="#20">20</a>), pero luego se confirm&oacute; en ratones(<a name="21.--"></a><a href="#21">21</a>), perros(<a name="22.--"></a><a href="#22">22</a>) y pacientes(<a name="23.--"></a><a href="#23">23</a>) con distrofia muscular, que este fen&oacute;meno era irrelevante, observ&aacute;ndose, respectivamente, apenas 0,25%, 0% y &lt;1% de fibras musculares con correcci&oacute;n del defecto molecular. La especulaci&oacute;n sobre que el mismo era debido a c&eacute;lulas madre circulantes fue puesto en jaque por experimentos que lo explicaban meramente por la fusi&oacute;n ocasional de monocitos o macr&oacute;fagos en las fibras musculares en regeneraci&oacute;n(<a name="24.--"></a><a href="#24">24</a>). </font></b> </font></p>           <p align="justify"></p>       <b><i><font face="Verdana" size="2">     <p align="justify">Mesoangioblastos</p>       </font></i></b>     <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">En los &uacute;ltimos a&ntilde;os, un equipo italiano public&oacute; resultados sorprendentes mediante el uso de una nueva c&eacute;lula a la cual se denomin&oacute; mesoangioblasto(<a name="25-26.--"></a><a href="#25">25</a>,<a href="#26">26</a>). En ratones con distrofia muscular se corrigi&oacute; el defecto molecular en m&aacute;s de 50% de las fibras musculares luego de inyecciones intraarteriales de mesoangioblastos de ratones normales(<a href="#26">26</a>). En perros con distrofia muscular, las inyecciones intraarteriales de mesoangioblastos normales corrigieron el defecto molecular en 4% a 70% de las fibras musculares, dependiendo del animal y del m&uacute;sculo analizado, report&aacute;ndose adem&aacute;s mejoras en la motricidad(<a href="#25">25</a>). Algunos autores, sin embargo, cuestionan la validez de la mejor&iacute;a cl&iacute;nica de los animales, que podr&iacute;a deberse a la inmunosupresi&oacute;n(<a name="27.--"></a><a href="#27">27</a>), y quedan por determinar las potenciales consecuencias en otros &oacute;rganos de una administraci&oacute;n sist&eacute;mica de grandes cantidades de c&eacute;lulas.</font></b></font></p>           <p align="justify"></p>       <b><font face="Verdana" size="2">     ]]></body>
<body><![CDATA[<p align="justify">V&iacute;a del trasplante celular </p>       </font><font face="Humanst521 BT,Lucida Sans Unicode" size="2">           <p align="justify"></p>       </font><font size="2">     <p align="justify"><font face="Verdana">Tras definir una c&eacute;lula apropiada para el trasplante, se debe determinar la t&eacute;cnica de implante. El desaf&iacute;o es importante para el m&uacute;sculo esquel&eacute;tico, ya que constituye cerca de 40% del peso corporal. Dos v&iacute;as son te&oacute;ricamente posibles: local e intravascular.</font></p>           <p align="justify"></p>       </font><i><font face="Verdana" size="2">     <p align="justify">Implante local</p>       </font></i></b>     <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">Si bien es el m&eacute;todo m&aacute;s frecuente, su limitante es que las c&eacute;lulas inyectadas se integran esencialmente a las fibras musculares vecinas al sitio de inyecci&oacute;n, fen&oacute;meno descripto por el autor en primates no humanos(<a name="28-30.--"></a><a href="#28">28</a>-<a href="#30">30</a>) y en pacientes(<a href="#7">7</a>,<a href="#9">9</a>). Ello impone una cantidad elevada de inyecciones para lograr una incorporaci&oacute;n significativa de las c&eacute;lulas injertadas. Experimentalmente se ha intentado expandir la fusi&oacute;n de los mioblastos implantados mediante diversas t&eacute;cnicas. El uso intramuscular de sustancias miot&oacute;xicas es eficaz en roedores(<a name="31.--"></a><a href="#31">31</a>), pero no siempre reproducible en primates no humanos(<a href="#28">28</a>,<a href="#30">30</a>). Inhibir la proliferaci&oacute;n de las c&eacute;lulas sat&eacute;lite del receptor mediante radiaci&oacute;n ionizante favorece la participaci&oacute;n de las c&eacute;lulas trasplantadas en ratones(<a href="#31">31</a>,<a name="32.--"></a><a href="#32">32</a>). Estrategias de terapia g&eacute;nica ex vivo, como la modificaci&oacute;n gen&eacute;tica de los mioblastos para inducir la secreci&oacute;n de enzimas que degradan la matriz extracelular(<a name="33.--"></a><a href="#33">33</a>), no han logrado, en nuestras manos, mejorar los injertos en primates no humanos(<a name="34.--"></a><a href="#34">34</a>). Dado que por el momento no se ha conseguido extender la integraci&oacute;n de las c&eacute;lulas implantadas m&aacute;s all&aacute; de los sitios de inyecci&oacute;n utilizando t&eacute;cnicas aplicables en la cl&iacute;nica con un adecuado margen riesgo/beneficio, el autor ha considerado necesario mejorar t&eacute;cnicamente el implante celular mediante el uso de dispositivos que aceleren, faciliten y sistematicen la inyecci&oacute;n intramuscular repetitiva de c&eacute;lulas. Con esa finalidad, hemos adaptado dispositivos manuales existentes para otros fines (reparto fraccionado de peque&ntilde;as cantidades de l&iacute;quido en laboratorio)(<a name="35.--"></a><a href="#35">35</a>) y, en una segunda etapa, desarrollado dispositivos con cierto grado de automatizaci&oacute;n, dise&ntilde;ados espec&iacute;ficamente para el implante celular repetitivo(<a name="36.--"></a><a href="#36">36</a>). Tambi&eacute;n hemos propuesto, como estrategia de futuro, el desarrollo de dispositivos de implante robotizados, programables seg&uacute;n un an&aacute;lisis imagenol&oacute;gico de las regiones a inyectar(<a name="37-38.--"></a><a href="#37">37</a>,<a href="#38">38</a>).</font></b></font></p>           <p align="justify"></p>       <b><i><font face="Verdana" size="2">     <p align="justify">Administraci&oacute;n intravascular</p>       </font></i></b>     <p align="justify"></p>           ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana"><b><font size="2">Dado el volumen del m&uacute;sculo esquel&eacute;tico y la inaccesibilidad de algunos lugares para inyecciones percut&aacute;neas, el trasplante se beneficiar&iacute;a de una distribuci&oacute;n intravascular. Las &uacute;nicas c&eacute;lulas en las que se ha reportado una capacidad para incorporarse eficientemente a las fibras musculares a partir de una inyecci&oacute;n intravascular son las mesoangioblastos(<a href="#25">25</a>,<a href="#26">26</a>). Hasta ahora, sin embargo, este resultado no ha sido reproducido por grupos independientes.</font></b></font></p>           <p align="justify"></p>       <b><font face="Verdana" size="2">     <p align="justify">Supervivencia del trasplante celular</p>       </font><font size="2">     <p align="justify"></p>           <p align="justify"><font face="Verdana">La supervivencia de las c&eacute;lulas trasplantadas deviene en el tercer factor en el &eacute;xito del injerto. Puede verse afectada por factores a corto o largo plazo.</font></p>           <p align="justify"></p>       </font></b>     <p align="justify"><b><i><font face="Verdana" size="2">Supervivencia a corto plazo</font></i></b></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">Dejando de lado el rechazo hiperagudo (habitualmente evitado por la detecci&oacute;n de anticuerpos antidonante en el receptor), la supervivencia inmediata del trasplante celular puede verse perjudicada por fen&oacute;menos que no est&aacute;n presentes en el trasplante de &oacute;rganos, como la anoikis(<a name="39.--"></a><a href="#39">39</a>), un mecanismo de apoptosis activado por la p&eacute;rdida de contacto entre la c&eacute;lula y su sustrato. Por otro lado, si las c&eacute;lulas implantadas proliferan la mortalidad puede compensarse(<a name="40.--"></a><a href="#40">40</a>). Existe consenso en cuanto a que en el trasplante de precursores musculares un porcentaje apreciable de las c&eacute;lulas implantadas muere en los primeros tres d&iacute;as. En nuestras experiencias en ratones, esa muerte celular, evaluada con un marcador radioactivo, vari&oacute; de 70% en el trasplante de c&eacute;lulas de cultivos primarios a 97% en el trasplante de c&eacute;lulas clonadas y modificadas gen&eacute;ticamente(<a href="#40">40</a>). El autor fue el primero en mostrar evidencias de apoptosis y necrosis en las c&eacute;lulas injertadas en el per&iacute;odo inmediato postrasplante(<a href="#40">40</a>) (<a href="#figura2">figura 2</a>). Este fen&oacute;meno no compromete el injerto debido a que no todas las c&eacute;lulas mueren y a que la proliferaci&oacute;n compensar&iacute;a la mortalidad en forma parcial(<a name="41.--"></a><a href="#41">41</a>) o total(<a href="#40">40</a>). </font></b> </font></p>           <p align="justify"><font face="Verdana"><b><font size="2">Este proceso de muerte precoz no est&aacute; a&uacute;n bien caracterizado y existen controversias sobre sus causas. Algunas observaciones en ratones llevaron a que nuestro grupo postulara como causa la reacci&oacute;n inflamatoria(<a name="42.--"></a><a href="#42">42</a>), aunque un estudio posterior parecer&iacute;a refutar esta hip&oacute;tesis(<a name="43.--"></a><a href="#43">43</a>), sugiri&eacute;ndose incluso que los macr&oacute;fagos podr&iacute;an tener un efecto protector en los mioblastos trasplantados(<a name="44.--"></a><a href="#44">44</a>). Recientemente, el autor demostr&oacute; la importancia de la isquemia en las acumulaciones intratisulares que forman c&eacute;lulas implantadas(<a name="45.--"></a><a href="#45">45</a>). S&oacute;lo una faja perif&eacute;rica de 100 a 200 &micro;m se beneficia de la difusi&oacute;n de ox&iacute;geno y nutrientes a partir del tejido receptor, mientras que las c&eacute;lulas situadas en el centro mueren (<a href="/img/revistas/rmu/v25n3/3a07f3.gif">figura 3</a>). Este fen&oacute;meno limita el n&uacute;mero de c&eacute;lulas que pueden implantarse por inyecci&oacute;n directa en un &uacute;nico sitio: los implantes de 1 x 106, 3 x 106, 10 x 106 y 20 x 106 de c&eacute;lulas presentaron, respectivamente una media de 2%, 9%, 41% y 59% de necrosis isqu&eacute;mica(<a href="#45">45</a>).</font></b></font></p>           ]]></body>
<body><![CDATA[<p align="justify"></p>           <p align="justify"><b><i><font face="Verdana" size="2">Supervivencia a largo plazo</font></i></b></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">El &uacute;nico factor que parece comprometer la supervivencia a largo plazo del injerto celular es el rechazo agudo, presente en condiciones alog&eacute;nicas. El rechazo agudo de las fibras musculares h&iacute;bridas en condiciones de inmunosupresi&oacute;n inadecuada fue descripto por el autor en primates no humanos(<a href="#28">28</a>,<a href="#29">29</a>) y en pacientes que recibieron alotrasplantes de mioblastos(<a href="#7">7</a>) (<a href="#Figura4">figura 4</a>). Los medios actuales o potenciales para evitar el rechazo agudo son la inmunosupresi&oacute;n, el desarrollo de tolerancia inmunol&oacute;gica, y el autotrasplante.</font></b></font></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>Inmunosupresi&oacute;n. </i>La elecci&oacute;n de protocolos de inmunosupresi&oacute;n debe ser cuidadosa, pues algunos f&aacute;rmacos pueden tener efectos nocivos sobre las c&eacute;lulas implantadas. Un ejemplo es la ciclofosfamida, usada en un ensayo cl&iacute;nico preliminar de trasplante de mioblastos(<a name="46.--"></a><a href="#46">46</a>), la cual eliminar&iacute;a las c&eacute;lulas trasplantadas en la medida en que estas proliferen(<a name="47.--"></a><a href="#47">47</a>). La ciclosporina, si bien fue usada en ratones(<a href="#10">10</a>,<a name="48.--"></a><a href="#48">48</a>), posee propiedades que pueden afectar el &eacute;xito del injerto: inhibe la fusi&oacute;n de mioblastos in vitro(<a name="49.--"></a><a href="#49">49</a>), interfiere con su diferenciaci&oacute;n(<a name="50.--"></a><a href="#50">50</a>) y puede inducir su apoptosis(<a href="#50">50</a>). El micofenolato mofetilo inhibe la fusi&oacute;n in vitro de los mioblastos de rat&oacute;n(<a name="51.--"></a><a href="#51">51</a>), aunque no parece afectar el resultado del injerto en macacos(<a href="#29">29</a>). Los mejores aloinjertos de mioblastos en el rat&oacute;n fueron obtenidos por nuestro grupo usando tacrolimus(<a href="#31">31</a>). Esto llev&oacute; a que lo prob&aacute;ramos con &eacute;xito en macacos(<a href="#28">28</a>-<a href="#30">30</a>) y que se convirtiera en nuestro inmunosupresor de elecci&oacute;n para ensayos cl&iacute;nicos(<a href="#7">7</a>-<a href="#9">9</a>). </font></b> </font></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>Tolerancia inmunol&oacute;gica. </i>Eludir el rechazo preservando la inmunidad contra pat&oacute;genos y tumores, as&iacute; como evitar los efectos adversos de los inmunosupresores, es un objetivo primordial de la investigaci&oacute;n en trasplantes. Aunque el trasplante de c&eacute;lulas miog&eacute;nicas presentar&iacute;a problemas espec&iacute;ficos para el desarrollo de tolerancia inmunol&oacute;gica perif&eacute;rica o central(<a name="52.--"></a><a href="#52">52</a>), podr&iacute;a ofrecer otras soluciones si fuera posible manipular las c&eacute;lulas ex vivo para reducir su inmunogenicidad(<a name="53.--"></a><a href="#53">53</a>). Un estudio en el cual se modificaron gen&eacute;ticamente mioblastos para que expresaran HLA-G (mol&eacute;cula que interviene en la tolerancia materna hacia el feto) mostr&oacute; que estos eran capaces de resistir a la lisis por linfocitos activados(<a name="54.--"></a><a href="#54">54</a>).</font></b></font></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>Autotrasplante. </i>Una forma de evitar la histoincompatibilidad es el uso de c&eacute;lulas del propio paciente, manipuladas in vitro para corregir el defecto gen&eacute;tico. El principio fue probado en ratones por nuestro equipo y otros, trasplantando mioblastos de ratones o pacientes con distrofia muscular, previamente corregidos ex vivo(<a name="55-56.--"></a><a href="#55">55</a>,<a href="#56">56</a>). Tambi&eacute;n hemos demostrado la viabilidad de la estrategia en macacos(<a name="57.--"></a><a href="#57">57</a>), importante para la extrapolaci&oacute;n al hombre. Esta t&aacute;ctica, sin embargo, deja la posibilidad de un rechazo a largo plazo por incompatibilidad de ant&iacute;genos menores (el producto del transgen incorporado en las c&eacute;lulas)(<a name="58.--"></a><a href="#58">58</a>).</font></b></font></p>           ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana"><a name="figura2"><font size="2"></font></a> <font size="2"><img style="width: 507px; height: 535px;" alt="" src="/img/revistas/rmu/v25n3/3a07f2.gif"></font><b><font size="2"> </font></b> </font></p>          <p align="justify"><font face="Verdana" size="2">Figura 2</font></p>         <p align="justify"><font face="Verdana" size="2"><a name="Figura4"></a><img style="width: 506px; height: 412px;" alt="" src="/img/revistas/rmu/v25n3/3a07f4.gif"></font></p>     <font face="Verdana" size="2">Figura 4 </font>  <b><font face="Verdana" size="2">     <p align="justify">Tumorigenicidad del trasplante celular</p>       </font></b>     <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">Un riesgo potencial del trasplante de c&eacute;lulas con capacidad proliferativa es la formaci&oacute;n de neoplasmas. Este riesgo es mayor en el caso de cultivos que puedan dar origen a l&iacute;neas celulares continuas o en c&eacute;lulas donde una manipulaci&oacute;n gen&eacute;tica pueda activar oncogenes. En el rat&oacute;n, por ejemplo, se observaron rabdomiosarcomas tras el trasplante de l&iacute;neas continuas de c&eacute;lulas miog&eacute;nicas(<a href="#10">10</a>,<a name="59.--"></a><a href="#59">59</a>). Si bien no se ha reportado formaci&oacute;n de tumores tras el trasplante de mioblastos obtenidos de cultivos primarios, nuestro equipo considera prudente excluir la tumorigenicidad de las c&eacute;lulas a trasplantar en pacientes, observando su comportamiento in vivo. Las c&eacute;lulas son trasplantadas en m&uacute;sculos de ratones inmunodeficientes(<a name="60.--"></a><a href="#60">60</a>), evalu&aacute;ndose por histopatolog&iacute;a si hubo formaci&oacute;n de tumores (<a href="/img/revistas/rmu/v25n3/3a07f5.gif">figura 5</a>).</font></b></font></p>         <p align="justify">&nbsp;</p>           <p align="justify"></p>       <b><font face="Verdana" size="2">     <p align="justify">Trasplante de c&eacute;lulas en el m&uacute;sculo card&iacute;aco</p>       </font></b>     <p align="justify"></p>           ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana"><b><font size="2">El m&uacute;sculo card&iacute;aco, al contrario del esquel&eacute;tico, no dispone de una c&eacute;lula progenitora eficaz. La capacidad proliferativa de los cardiomiocitos es motivo de controversia(<a name="61-62.--"></a><a href="#61">61</a>,<a href="#62">62</a>), y si bien podr&iacute;an existir ciertos progenitores(<a name="63-65.--"></a><a href="#63">63</a>-<a href="#65">65</a>), la regeneraci&oacute;n del miocardio es en los hechos nula. Por ello, el infarto de miocardio produce una cicatriz cuyas consecuencias son la remodelaci&oacute;n y la insuficiencia card&iacute;aca. Un tratamiento ideal ser&iacute;a sustituir la cicatriz por un tejido capaz de participar en la funci&oacute;n de bomba del ventr&iacute;culo; con ese objetivo, la idea del trasplante de c&eacute;lulas miog&eacute;nicas no tard&oacute; en ser extrapolada al m&uacute;sculo card&iacute;aco. </font></b> </font></p>           <p align="justify"><b><font size="2" face="Verdana">Los principales aspectos del trasplante de c&eacute;lulas miog&eacute;nicas ya han sido analizados, por lo que se abordar&aacute;n a continuaci&oacute;n cuestiones espec&iacute;ficas al m&uacute;sculo card&iacute;aco.</font></b></p>           <p align="justify"></p>       <b><font face="Verdana" size="2">     <p align="justify">Tipos celulares para el trasplante </p>       </font><font size="2">     <p align="justify"></p>           <p align="justify"><font face="Verdana">Varios tipos celulares han sido utilizados en experimentos animales y en ensayos cl&iacute;nicos.</font></p>           <p align="justify"></p>       </font><i><font face="Verdana" size="2">     <p align="justify">Cardiomiocitos</p>       </font></i></b>     <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">La primera c&eacute;lula a considerar en medicina regenerativa es aquella que forma el tejido que desea reconstruirse. Si fuera posible extraer una biopsia de miocardio del propio paciente y proliferar sus cardiomiocitos en cultivo produciendo un n&uacute;mero adecuado para el trasplante, la ingenier&iacute;a tisular del miocardio se ver&iacute;a facilitada. Pero los cardiomiocitos del adulto no proliferan in vitro(<a name="66.--"></a><a href="#66">66</a>) y s&oacute;lo la creaci&oacute;n de ratones transg&eacute;nicos en los cuales estas c&eacute;lulas proliferaban gracias a la expresi&oacute;n del ant&iacute;geno T del papovirus SV-40(<a name="67.--"></a><a href="#67">67</a>), permiti&oacute; estudios pioneros de trasplante de cardiomiocitos(<a name="68.--"></a><a href="#68">68</a>). Los cardiomiocitos fetales, por su lado, s&iacute; proliferan in vitro, y trasplantados en el coraz&oacute;n de ratones y perros son capaces de formar discos intercalares con los cardiomiocitos del receptor(<a name="69.--"></a><a href="#69">69</a>), integr&aacute;ndose funcionalmente al miocardio(<a name="70.--"></a><a href="#70">70</a>). En ratas, el trasplante de cardiomiocitos fetales en zonas de infarto fue capaz de neoformar tejido card&iacute;aco, limitar la expansi&oacute;n de la cicatriz y mejorar la funci&oacute;n card&iacute;aca(<a name="71.--"></a><a href="#71">71</a>). Este implante evitaba la remodelaci&oacute;n card&iacute;aca pero no la revert&iacute;a(<a name="72.--"></a><a href="#72">72</a>). </font></b> </font></p>           ]]></body>
<body><![CDATA[<p align="justify"></p>       <b><i><font face="Verdana" size="2">     <p align="justify">Mioblastos</p>       </font></i></b>     <p align="justify"></p>           <p align="justify"><b><font size="2" face="Verdana">La facilidad para obtener y producir estas c&eacute;lulas, la posibilidad del trasplante aut&oacute;logo, y el precedente de seguridad sentado por los trasplantes cl&iacute;nicos en distrofias musculares facilitaron su uso experimental en el coraz&oacute;n. </font></b></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>Estudios precl&iacute;nicos. </i>La t&eacute;cnica fue propuesta en 1989 por Kao y colaboradores(<a name="73.--"></a><a href="#73">73</a>). En sus primeros estudios, este equipo interpret&oacute; que los mioblastos injertados se transdiferenciaban en cardiomiocitos(<a href="#73">73</a>,<a name="74.--"></a><a href="#74">74</a>), lo que fue refutado luego por estudios m&aacute;s rigurosos(<a name="75.--"></a><a href="#75">75</a>). De hecho, las descripciones de "transdiferenciaci&oacute;n" pueden explicarse por artefactos t&eacute;cnicos o por la fusi&oacute;n de mioblastos con cardiomiocitos del receptor(<a name="76.--"></a><a href="#76">76</a>). Taylor y colaboradores fueron los primeros en reportar una mejora de la funci&oacute;n card&iacute;aca tras el trasplante de mioblastos en una regi&oacute;n necr&oacute;tica del miocardio(<a name="77.--"></a><a href="#77">77</a>). Esta mejora no era producida por la neoformaci&oacute;n de un tejido capaz de integrarse funcionalmente al miocardio, pues ambos quedaban aislados por la cicatriz. La ausencia de interacci&oacute;n electro-mec&aacute;nica entre el tejido neoformado y el miocardio fue confirmada luego por registros intracelulares(<a name="78.--"></a><a href="#78">78</a>). Como corolario de varios estudios(<a name="79-83.--"></a><a href="#79">79</a>-<a href="#83">83</a>), se concluy&oacute; que el trasplante de mioblastos en el infarto era capaz de mejorar parcialmente la funci&oacute;n mioc&aacute;rdica en modelos animales (sobre todo en roedores), aunque no por neoformaci&oacute;n de un tejido capaz de contribuir a la contracci&oacute;n card&iacute;aca, sino por cambios en las propiedades f&iacute;sicas de la cicatriz. </font></b></font></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>Ensayos cl&iacute;nicos de fase I. </i>En el a&ntilde;o 2000, el equipo del Dr. Philippe Menach&eacute; realiz&oacute; en Francia la primera inyecci&oacute;n intracard&iacute;aca de mioblastos aut&oacute;logos en un paciente con insuficiencia card&iacute;aca severa causada por un infarto de miocardio(<a name="84.--"></a><a href="#84">84</a>), iniciando el primer ensayo cl&iacute;nico de fase I(<a name="85.--"></a><a href="#85">85</a>). El mismo incluy&oacute; pacientes con cicatriz no viable y con indicaci&oacute;n de bypass coronario (la cirug&iacute;a permit&iacute;a el abordaje del coraz&oacute;n para las inyecciones de mioblastos). El estudio mostr&oacute; la viabilidad y seguridad de la t&eacute;cnica &ndash;con la salvedad de la aparici&oacute;n de arritmias&ndash; report&aacute;ndose mejoras sintom&aacute;ticas y estabilizaci&oacute;n de la fracci&oacute;n de eyecci&oacute;n. Otros ensayos cl&iacute;nicos se sucedieron con protocolos y resultados esencialmente similares(<a name="86-88.--"></a><a href="#86">86</a>-<a href="#88">88</a>). En algunos pacientes se obtuvieron muestras de miocardio (por deceso o por trasplante card&iacute;aco), donde la histolog&iacute;a mostr&oacute; acumulaciones de miotubos en la cicatriz del infarto(<a href="#88">88</a>,<a name="89.--"></a><a href="#88">89</a>). Como estos ensayos eran concomitantes a una cirug&iacute;a de bypass coronario, no pudo dilucidarse en qu&eacute; medida el beneficio era atribuible s&oacute;lo al bypass o inclu&iacute;a el injerto. Algunos ensayos intentaron la implantaci&oacute;n por cat&eacute;ter(<a name="90-92.--"></a><a href="#90">90</a>-<a href="#92">92</a>). Todos los estudios confirmaron la viabilidad del procedimiento, pero sugirieron un aumento de arritmias ventriculares. </font></b> </font></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2"><i>Ensayos cl&iacute;nicos de fase II. </i>Para evaluar de forma m&aacute;s concluyente el trasplante intracard&iacute;aco de mioblastos, el equipo del Dr. Menasch&eacute; organiz&oacute; un estudio cl&iacute;nico de fase II, multic&eacute;ntrico, randomizado, en doble ciego, con control placebo y dosis escaladas(<a name="93.--"></a><a href="#93">93</a>). Noventa y siete pacientes fueron divididos en tercios que, durante un bypass coronario, recibieron respectivamente inyecciones de placebo, 400 x 106 mioblastos o 800 x 106 mioblastos. El implante no mejor&oacute; la funci&oacute;n regional o global del ventr&iacute;culo izquierdo por sobre el efecto del bypass, pero se consider&oacute; prometedor que la mayor dosis de c&eacute;lulas produjera una reversi&oacute;n significativa de la remodelaci&oacute;n ventricular. Esta observaci&oacute;n fue explicada por un potencial efecto de los mioblastos en la composici&oacute;n de la matriz extracelular de la cicatriz del infarto, que reducir&iacute;a la fibrosis. Si ese efecto ben&eacute;fico sobre la remodelaci&oacute;n fuese persistente, podr&iacute;a traducirse en un mejor pron&oacute;stico para los pacientes. Con respecto a la seguridad del procedimiento, la proporci&oacute;n de pacientes que sufrieron arritmias no fue significativamente diferente entre los tres grupos, pero hubo m&aacute;s episodios de arritmia en aquellos que recibieron implantes de mioblastos. El riesgo de un aumento en la incidencia de arritmias, de hecho, parecer&iacute;a existir en otros tipos de trasplante celular en el coraz&oacute;n (aunque con menos frecuencia que con los mioblastos), y las c&eacute;lulas implantadas lo producir&iacute;an por cualquiera de los tres mecanismos arritmog&eacute;nicos mayores: reentrada, automatismo y actividad gatillada(<a name="94.--"></a><a href="#94">94</a>).</font></b></font></p>           ]]></body>
<body><![CDATA[<p align="justify"></p>       <b><i><font face="Verdana" size="2">     <p align="justify">Progenitores card&iacute;acos</p>       </font></i></b>     <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">Se han detectado escasas c&eacute;lulas madre en el miocardio de ratones(<a name="95-97.--"></a><a href="#95">95</a>-<a href="#97">97</a>) y se describieron cardioblastos en el miocardio posnatal de ratones, ratas y humanos(<a name="98.--"></a><a href="#98">98</a>). Los mesoangioblastos tambi&eacute;n estar&iacute;an presentes en el miocardio y podr&iacute;an diferenciarse en cardiomiocitos(<a name="99.--"></a><a href="#99">99</a>). Ciertas evidencias sugieren adem&aacute;s la presencia de c&eacute;lulas circulantes capaces de diferenciarse en miocardio. Las observaciones en roedores(<a href="#63">63</a>) parecen confirmarse en el hombre tras el an&aacute;lisis del tejido card&iacute;aco de necropsias realizadas en varones que hab&iacute;an recibido un trasplante de coraz&oacute;n de mujer(<a href="#64">64</a>). La detecci&oacute;n del cromosoma Y permiti&oacute; inferir que 0,04% de los cardiomiocitos proven&iacute;an del receptor y que esto ocurr&iacute;a en zonas de lesi&oacute;n. El uso de tales progenitores en medicina regenerativa depender&iacute;a de la capacidad para aislarlos y proliferarlos en cantidad suficiente para el injerto, sin perder sus propiedades biol&oacute;gicas. Sin embargo, se debe destacar su ineficiencia para regenerar el miocardio en forma espont&aacute;nea.</font></b></font></p>           <p align="justify"></p>       <b><i><font face="Verdana" size="2">     <p align="justify">C&eacute;lulas madre embrionarias</p>       </font></i></b>     <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">Estudios preliminares en roedores recurrieron al implante intramioc&aacute;rdico de c&eacute;lulas madre embrionarias a fin de observar si ello bastaba para inducir su diferenciaci&oacute;n en cardiomiocitos(<a name="100-101.--"></a><a href="#100">100</a>, <a href="#101">101</a>). Los resultados fueron negativos y el implante gener&oacute; teratomas, descartando el implante de c&eacute;lulas madre embrionarias indiferenciadas. Como la opci&oacute;n m&aacute;s l&oacute;gica ser&iacute;a diferenciar las c&eacute;lulas madre embrionarias in vitro previo al trasplante, las condiciones de cultivo para ello comienzan a estar m&aacute;s definidas(<a name="102.--"></a><a href="#103">102</a>). Experiencias en ratones inmunodeficientes mostraron la capacidad de los cardiomiocitos derivados de c&eacute;lulas madre embrionarias humanas para regenerar el miocardio y mejorar la funci&oacute;n card&iacute;aca en zonas de infarto(<a name="103.--"></a><a href="#103">103</a>), aunque esa mejora no se manten&iacute;a a largo plazo(<a name="104.--"></a><a href="#104">104</a>). Aun dejando de lado los obst&aacute;culos &eacute;tico-religiosos, ciertos detalles t&eacute;cnicos deben ser resueltos antes de una utilizaci&oacute;n cl&iacute;nica de cardiomiocitos derivados de c&eacute;lulas madre embrionarias; esencialmente, una separaci&oacute;n espec&iacute;fica, segura y con alto rendimiento. Por lo dem&aacute;s, fuera de un contexto de clonaci&oacute;n terap&eacute;utica, su uso implica condiciones alog&eacute;nicas y el recurso a inmunosupresi&oacute;n. Algunos autores pretenden que las c&eacute;lulas madre embrionarias tendr&iacute;an privilegio inmunol&oacute;gico, es decir, ser&iacute;an "invisibles" al sistema inmunitario en un contexto alog&eacute;nico e incluso xenog&eacute;nico(<a name="105-106.--"></a><a href="#105">105</a>,<a href="#106">106</a>). Esta hip&oacute;tesis, sin embargo, deja de lado el hecho de que estas c&eacute;lulas deben diferenciarse y de que las propiedades antig&eacute;nicas de los cardiomiocitos obtenidos de c&eacute;lulas madre embrionarias no parecen diferir de sus hom&oacute;logos adultos(<a name="107.--"></a><a href="#107">107</a>). Una v&iacute;a interesante para la obtenci&oacute;n aut&oacute;loga de c&eacute;lulas pluripotentes con propiedades similares a las c&eacute;lulas madre embrionarias, eludiendo las controversias &eacute;ticas, ser&iacute;a la reprogramaci&oacute;n in vitro de c&eacute;lulas som&aacute;ticas como los fibroblastos(<a name="108-109.--"></a><a href="#108">108</a>,<a href="#109">109</a>), posibilidad que est&aacute; cobrando actualmente mucho inter&eacute;s(<a name="110.--"></a><a href="#110">110</a>). Se ha dado a estas c&eacute;lulas la denominaci&oacute;n de c&eacute;lulas pluripotentes inducidas.</font></b></font></p>           <p align="justify"></p>       <b><i><font face="Verdana" size="2">     <p align="justify">C&eacute;lulas de la m&eacute;dula &oacute;sea</p>       </font></i></b>     ]]></body>
<body><![CDATA[<p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">Aunque ciertos estudios sugieren que las c&eacute;lulas madre mesenquimatosas podr&iacute;an diferenciarse en cardiomiocitos(<a name="111.--"></a><a href="#111">111</a>), su inyecci&oacute;n intracard&iacute;aca podr&iacute;a comportar riesgos de formaci&oacute;n ect&oacute;pica de otros tejidos mesod&eacute;rmicos. El implante intracard&iacute;aco de m&eacute;dula &oacute;sea en ratas, por ejemplo, produjo tejido &oacute;seo, atribuible al potencial osteog&eacute;nico de las c&eacute;lulas madre mesenquimatosas(<a name="112.--"></a><a href="#112">112</a>). Un equipo interpret&oacute; que las c&eacute;lulas madre hematopoy&eacute;ticas eran capaces de neoformar miocardio en la cicatriz de infarto en ratones(<a name="113.--"></a><a href="#113">113</a>), pero estudios posteriores en ratones(<a name="114.--"></a><a href="#114">114</a>), ovinos(<a name="115.--"></a><a href="#115">115</a>) y primates no humanos(<a name="116.--"></a><a href="#116">116</a>), fueron negativos, y se comprob&oacute; que las c&eacute;lulas madre hematopoy&eacute;ticas inyectadas en el coraz&oacute;n se diferencian s&oacute;lo en c&eacute;lulas sangu&iacute;neas(<a name="117.--"></a><a href="#117">117</a>). </font></b> </font></p>           <p align="justify"><font face="Verdana"><b><font size="2">Siendo el trasplante de m&eacute;dula &oacute;sea una t&eacute;cnica est&aacute;ndar en hematolog&iacute;a, el paso de los experimentos en animales a ensayos cl&iacute;nicos fue r&aacute;pido, us&aacute;ndose en forma aut&oacute;loga tanto m&eacute;dula &oacute;sea no fraccionada como poblaciones seleccionadas (CD34+ y CD133+), administradas por v&iacute;a intracoronaria e intramioc&aacute;rdica(<a name="118.--"></a><a href="#118">118</a>). Si bien algunos estudios reportaron mejoras leves de la funci&oacute;n card&iacute;aca, pocos fueron randomizados y controlados y los resultados son contradictorios. Por otro lado, la inyecci&oacute;n de c&eacute;lulas CD133+ por v&iacute;a intracoronaria podr&iacute;a causar efectos adversos en las arterias coronarias(<a name="119-120.--"></a><a href="#119">119</a>,<a href="#120">120</a>). </font></b> </font></p>           <p align="justify"></p>           <p align="justify"><b><font face="Verdana" size="2">Causas de la mejora postrasplante (<a href="#Figura6">figura 6</a>)</font></b></p>           <p align="justify"></p>           <p align="justify"><font face="Verdana"><b><font size="2">El prop&oacute;sito original del trasplante celular intracard&iacute;aco era la regeneraci&oacute;n de un tejido contr&aacute;ctil capaz de interactuar electro-mec&aacute;nicamente con el tejido card&iacute;aco del receptor. Pese a ciertos datos al inicio contradictorios, es evidente que los trasplantes de mioblastos y de c&eacute;lulas de la m&eacute;dula &oacute;sea no alcanzaron ese objetivo. Las mejoras de la funci&oacute;n card&iacute;aca observadas en los modelos animales y en los ensayos cl&iacute;nicos deben explicarse por otros mecanismos. La hip&oacute;tesis predominante es que los injertos celulares limitan la remodelaci&oacute;n del ventr&iacute;culo izquierdo. Se ha propuesto que las acumulaciones de c&eacute;lulas trasplantadas engrosar&iacute;an la pared del infarto y limitar&iacute;an la dilataci&oacute;n del ventr&iacute;culo(<a name="121.--"></a><a href="#121">121</a>). Tambi&eacute;n se ha sugerido un efecto par&aacute;crino del implante, por el cual la matriz extracelular ganar&iacute;a en propiedades el&aacute;sticas(<a name="122.--"></a><a href="#122">122</a>). M&aacute;s all&aacute; de dilucidar los mecanismos de los beneficios reportados, lo cierto es que estos &uacute;ltimos han sido muy limitados y el objetivo principal de la medicina regenerativa en este campo sigue siendo el se&ntilde;alado al inicio del p&aacute;rrafo. </font></b> </font></p>           <p align="justify"></p>       <b><font face="Verdana" size="2">     <p align="justify">Conclusiones</p>       </font><font size="2">     <p align="justify"></p>           ]]></body>
<body><![CDATA[<p align="justify"><font face="Verdana">El progreso en tem&aacute;ticas relacionadas a la medicina regenerativa &ndash;trasplantes celulares, ingenier&iacute;a tisular y terapia g&eacute;nica&ndash; permite cierto optimismo en prever, para un futuro cercano, la posibilidad de ofrecer mejores tratamientos para diferentes patolog&iacute;as del m&uacute;sculo esquel&eacute;tico y card&iacute;aco. Los ensayos cl&iacute;nicos han permitido verificar la viabilidad y seguridad de algunos m&eacute;todos, y aunque los resultados cl&iacute;nicos han sido modestos o marginales, los caminos a seguir parecen presentarse con m&aacute;s claridad, como se resume a continuaci&oacute;n.</font></p>       <p align="justify"><font face="Verdana"><a name="Figura6"></a><img style="width: 501px; height: 429px;" alt="" src="/img/revistas/rmu/v25n3/3a07f6.gif"></font></p>       <p align="justify"><font face="Verdana">Figura 6 </font> </p>           <p align="justify"><font face="Verdana">En el m&uacute;sculo esquel&eacute;tico, de confirmarse la capacidad de los mesoangioblastos para corregir el defecto molecular en un volumen significativo de m&uacute;sculo tras una inyecci&oacute;n intravascular, sin producir efectos secundarios en otros &oacute;rganos, su uso podr&iacute;a ser clave en el tratamiento de las miopat&iacute;as gen&eacute;ticas recesivas o ligadas al cromosoma X en las cuales existe una necrosis constante de las fibras musculares (elemento necesario para la integraci&oacute;n eficaz de las c&eacute;lulas implantadas por v&iacute;a sist&eacute;mica). En otras miopat&iacute;as gen&eacute;ticas sin necrosis prominente, as&iacute; como en los casos de degeneraci&oacute;n muscular avanzada con sustituci&oacute;n del par&eacute;nquima contr&aacute;ctil por fibrosis o tejido adiposo, el implante intramuscular de precursores musculares como los mioblastos nos sigue pareciendo la &uacute;nica estrategia adecuada. Lo mismo se aplicar&iacute;a a d&eacute;ficits musculares localizados, como el caso del esf&iacute;nter externo de la uretra en la incontinencia urinaria. Quedan por refinar las estrategias de implante que aseguren una integraci&oacute;n &oacute;ptima de las c&eacute;lulas inyectadas en el tejido receptor, as&iacute; como los m&eacute;todos que aseguren una adecuada neoformaci&oacute;n de tejido muscular cuando ello es necesario. Para el implante intramuscular en grandes regiones, creemos necesaria la automatizaci&oacute;n en mayor o menor grado de la inyecci&oacute;n de c&eacute;lulas.</font></p>           <p align="justify"><font face="Verdana">El tratamiento efectivo del infarto de miocardio necesitar&aacute; el implante de c&eacute;lulas cuyo efecto no se limite a mejorar en forma restringida las caracter&iacute;sticas f&iacute;sicas de la cicatriz del infarto. Un tratamiento efectivo podr&aacute; ser posible s&oacute;lo mediante el implante intracard&iacute;aco de c&eacute;lulas capaces de desarrollar el programa de diferenciaci&oacute;n cardiog&eacute;nica, es decir, de diferenciarse en un fenotipo de cardiomiocito o equivalente que permita la propagaci&oacute;n el&eacute;ctrica, el acoplamiento electromec&aacute;nico y la contracci&oacute;n. Las c&eacute;lulas madre embrionarias se presentan al d&iacute;a de hoy como las m&aacute;s h&aacute;biles para dar lugar eficientemente a tal diferenciaci&oacute;n (previo al trasplante), pero los problemas &eacute;ticos e inmunol&oacute;gicos ligados a su utilizaci&oacute;n han puesto en la mira de los investigadores el desarrollo de las c&eacute;lulas pluripotentes inducidas. En todo caso, ser&aacute; necesario estandarizar cuantitativamente los par&aacute;metros del trasplante, especialmente en lo que concierne a la cantidad de c&eacute;lulas por inyecci&oacute;n y a la topograf&iacute;a y densidad de las mismas, de forma de asegurar una regeneraci&oacute;n &oacute;ptima y reproducible del tejido card&iacute;aco. </font> </p>           <p align="justify"><font face="Verdana">Creemos del caso finalizar con un llamado de atenci&oacute;n. Dado el creciente y a veces confuso c&uacute;mulo de estudios en medicina regenerativa (no siempre rigurosos y en algunos casos dudosos) es importante un abordaje cauto y cr&iacute;tico del tema: muchas novedades "prometedoras" acaban en lo irrepetible o lo refutado. Esta cautela es especialmente pertinente para evitar precipitados usos cl&iacute;nicos. Las aplicaciones m&eacute;dicas requieren una estandardizaci&oacute;n de la producci&oacute;n de las c&eacute;lulas adecuadas as&iacute; como de las t&eacute;cnicas de trasplante, y ello debe realizarse en modelos animales apropiados, defini&eacute;ndose las variables que permitan obtener resultados claros y reproducibles.</font></p>           <p align="justify"></p>       </font><font face="Verdana" size="2"><span lang="EN">     <p align="justify">Summary</p>       </span></font><font size="2">     <p align="justify"><font face="Verdana">Miogenic cells transplantions is an experimental technique in regenerative medicine. Intitially explored as a therapeutic tool in the treatment of myopathies, its extrapolation for the potential treatment of myocardial infarction currently spreads its scope of application. This study, based on bibliography and the author&rsquo;s experience during over a decade of clinical and preclinical research in the field, attempts to provide an update in a highly important topic for this century&rsquo;s medicine.</font></p>           <p align="justify"></p>       </font><span lang="ES-MODERN"> <font face="Verdana" size="2">     ]]></body>
<body><![CDATA[<p align="justify">R&eacute;sum&eacute;</p>       </font><font face="Humanst521 BT,Lucida Sans Unicode" size="2">           <p align="justify"></p>       </font>       </span></b>     <p align="justify"><b><font size="2" face="Verdana">La greffe de cellules &agrave; capacit&eacute; myog&eacute;nique est une strat&eacute;gie exp&eacute;rimentale de m&eacute;decine r&eacute;g&eacute;n&eacute;rative. <span lang="EN">Consid&eacute;r&eacute;e au d&eacute;but comme un outil th&eacute;rapeutique dans le traitement des myopathies, son usage au traitement potentiel de l&rsquo;infarctus du myocarde est plus large de nos jours. Ce rapport, bas&eacute; sur la bibliographie et l&rsquo;exp&eacute;rience de l&rsquo;auteur r&eacute;colt&eacute;e pendant plus d&rsquo;une d&eacute;cennie consacr&eacute;e &agrave; la recherche clinique et pr&eacute;clinique, pr&eacute;tend faire une br&egrave;ve mise &agrave; la page d&rsquo;un sujet qui est cens&eacute; avoir une grande incidence sur la m&eacute;decine de ce si&egrave;cle.</span></font></b></p>           <p align="justify"></p>       <b><font face="Verdana" size="2"><span lang="ES-MODERN">     <p align="justify">Resumo</p>       </span></font><font size="2">     <p align="justify"><font face="Verdana">O transplante de c&eacute;lulas com capacidade miog&ecirc;nica &eacute; uma estrat&eacute;gia experimental da medicina regenerativa. Explorada a principio como uma ferramenta terap&ecirc;utica no manejo das miopatias, sua extrapola&ccedil;&atilde;o ao tratamento potencial do infarto de mioc&aacute;rdio possibilitou uma maior expans&atilde;o. Este trabalho, baseado na bibliografia e na experi&ecirc;ncia do autor durante mais de uma d&eacute;cada dedicada &agrave; pesquisa cl&iacute;nica e pr&eacute;-cl&iacute;nica nessa &aacute;rea, pretende realizar una breve atualiza&ccedil;&atilde;o de um tema que pode ter grande import&acirc;ncia na medicina deste s&eacute;culo.</font></p>           <p align="justify"></p>       </font><font face="Verdana" size="2"><span lang="EN">     <p align="justify">Bibliograf&iacute;a</p>       </span></font></b> <dir>      <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="1"></a><a href="#1-2.--">1</a>. Skuk D. Myoblast transplantation for inherited myopathies: a clinical approach. Expert Opin Biol Ther 2004; 4(12): 1871-85.    </font></b></p>           ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="2"></a><a href="#1-2.--">2</a>. Skuk D, Tremblay JP. Cell therapies for inherited myopathies. Curr Opin Rheumatol 2003; 15(6): 723-9.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="3"></a><a href="#3.--">3</a>. Vilquin JT, Marolleau JP, Hagege A, Menasche P, Fiszman M, Schwartz K. Cell transplantation for post-ischemic heart failure. Arch Mal Coeur Vaiss 2002; 95(12): 1219-25.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="4"></a><a href="#4.--">4</a>. Skuk D, Tremblay JP. Progress in myoblast transplantation: a potential treatment of dystrophies. Microsc Res Tech 2000; 48(3-4): 213-22.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="5"></a><a href="#5.--">5</a>. Carr LK, Steele D, Steele S, Wagner D, Pruchnic R, Jankowski R, et al. 1-year follow-up of autologous muscle-derived stem cell injection pilot study to treat stress urinary incontinence. Int Urogynecol J Pelvic Floor Dysfunct 2008; 19(6): 881-3.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="6"></a><a href="#6.--">6</a>. Partridge TA, Grounds M, Sloper JC. Evidence of fusion between host and donor myoblasts in skeletal muscle grafts. Nature 1978; 273(5660): 306-8.    </font></b></p>           ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="7"></a><a href="#7-9.--">7</a>. Skuk D, Goulet M, Roy B, Chapdelaine P, Bouchard JP, Roy R, et al. Dystrophin expression in muscles of Duchenne muscular dystrophy patients after high-density injections of normal myogenic cells. J Neuropathol Exp Neurol 2006; 65(4): 371-86.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="8"></a><a href="#7-9.--">8</a>. Skuk D, Goulet M, Roy B, Piette V, C&ocirc;t&eacute; CH, Chapdelaine P, et al. First test of a "high-density injection" protocol for myogenic cell transplantation throughout large volumes of muscles in a Duchenne muscular dystrophy patient: eighteen months follow-up. Neuromuscul Disord 2007; 17(1): 38-46.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="9"></a><a href="#7-9.--">9</a>. Skuk D, Roy B, Goulet M, Chapdelaine P, Bouchard JP, Roy R, et al. Dystrophin expression in myofibers of Duchenne muscular dystrophy patients following intramuscular injections of normal myogenic cells. Mol Ther 2004; 9(3): 475-82.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="10"></a><a href="#10-11.--">10</a>. Wernig A, Irintchev A, Lange G. Functional effects of myoblast implantation into histoincompatible mice with or without immunosuppression. J Physiol 1995; 484(Pt 2): 493-504.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="11"></a><a href="#10-11.--">11</a>. Alameddine HS, Louboutin JP, Dehaupas M, S&eacute;bille A, Fardeau M. Functional recovery induced by satellite cell grafts in irreversibly injured muscles. Cell Transplant 1994; 3(1): 3-14.    </font></b></p>           ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="12"></a><a href="#12.--">12</a>. Yokoyama T, Huard J, Chancellor MB. Myoblast therapy for stress urinary incontinence and bladder dysfunction. World J Urol 2000; 18(1): 56-61.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="13"></a><a href="#13-14.--">13</a>. Heslop L, Beauchamp JR, Tajbakhsh S, Buckingham ME, Partridge TA, Zammit PS. Transplanted primary neonatal myoblasts can give rise to functional satellite cells as identified using the Myf5(nlacZl+) mouse. Gene Ther 2001; 8(10): 778-83.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="14"></a><a href="#13-14.--">14</a>. Ehrhardt J, Brimah K, Adkin C, Partridge T, Morgan J. Human muscle precursor cells give rise to functional satellite cells in vivo. Neuromuscul Disord 2007; 17(8): 631-8.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="15"></a><a href="#15-16.--">15</a>. Shinin V, Gayraud-Morel B, Gomes D, Tajbakhsh S. Asymmetric division and cosegregation of template DNA strands in adult muscle satellite cells. Nat Cell Biol 2006; 8(7): 677-87.    </font></b></p>           <!-- ref --><p align="justify"><b><font size="2" face="Verdana"><a name="16"></a><a href="#15-16.--">16</a>. Collins CA, Olsen I, Zammit PS, Heslop L, Petrie A, Partridge TA, et al. Stem cell function, self-renewal, and behavioral heterogeneity of cells from the adult muscle satellite cell niche. Cell 2005; 122(2): 289-301.    </font></b></p>           ]]></body>
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