<?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>1688-0420</journal-id>
<journal-title><![CDATA[Revista Uruguaya de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev.Urug.Cardiol.]]></abbrev-journal-title>
<issn>1688-0420</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Uruguaya de Cardiología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-04202005000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Cardioimplante celular para reparar tejido cardíaco: ¿un nuevo concepto terapéutico?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BIGALLI]]></surname>
<given-names><![CDATA[DANIEL]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[BICO]]></surname>
<given-names><![CDATA[ANDRéS]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[GOSSIO]]></surname>
<given-names><![CDATA[ELVIRA]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Sanatorio Casa de Galicia Centro Cardiovascular ]]></institution>
<addr-line><![CDATA[Montevideo ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Sanatorio Casa de Galicia Servicio de Hemoterapia y Medicina Transfusional ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Sanatorio Casa de Galicia Servicio de Hematología ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>11</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>11</month>
<year>2005</year>
</pub-date>
<volume>20</volume>
<numero>3</numero>
<fpage>158</fpage>
<lpage>170</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-04202005000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-04202005000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-04202005000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El concepto clásico de que el corazón es un órgano no regenerativo ha cambiado en los últimos años: hoy día se considera que el corazón es un órgano en regeneración continua. Los mecanismos que posee el organismo para la renovación de tejidos son limitados y dependen de la rapidez de instauración del daño. El cardioimplante celular consiste en injertar células diferenciadas o progenitoras en el miocardio lesionado, con el fin de inducir el crecimiento de nuevas fibras musculares y el desarrollo de angiogénesis, para mejorar y contribuir a la contracción sincrónica. Se han utilizado diferentes poblaciones celulares para tal fin, injertadas directamente en el miocardio o inyectadas en la circulación. En experimentación animal, en modelos de infarto de miocardio, el implante de células autólogas diferenciadas (cardiomiocitos embrionarios, fetales, mioblastos esqueléticos) ha mostrado un mejoramiento en la función ventricular. Por otra parte, la utilización de células madre de médula ósea o tejidos extramedulares ha producido la regeneración de cardiomiocitos y estructuras vasculares incluyendo células endoteliales y musculares lisas. El 15 de junio de 2000 se inició en Francia la fase I clínica en diez pacientes con cardiopatía isquémica necrótica, disfunción ventricular izquierda severa. Los pacientes fueron tratados con implante epicárdico de mioblastos esqueléticos en las zonas no viables y revascularización en zonas isquémicas remotas al implante. El 60% de las zonas no viables donde se trasplantaron los mioblastos adquirieron un aumento del espesor sistólico y contractilidad en las zonas necróticas. En el mundo ya han sido tratados cientos de pacientes, con diferentes poblaciones celulares, la mayoría con insuficiencia cardíaca secundaria a cardiopatía isquémica-necrótica, en los cuales se han obtenido resultados alentadores. Las evidencias actuales sugieren que en un futuro cercano el cardioimplante celular podría ser una opción válida para el tratamiento de ciertas enfermedades cardíacas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY The classic concept that the heart is known as a non-regenerative organ has changed in the last years: today it is considered as an organ in continuous regeneration. The mechanisms to renew tissues are limited and depend on the speed of the production of the damage. The cellular cardiac implant consists on grafting differentiated or progenitor cells in the damaged myocardium, to achieve the growth of new muscle fibers and angiogenesis, in order to improve and help synchronic contraction. Different cellular populations have been used to graft directly in the damaged myocardium or injected in the circulation. In animal experimentation, in models of myocardial infarction, the autologous transplantation of differentiated cells into damaged myocardium (such as cardiomyocyte, smooth muscle cells, fibroblasts, skeletal myoblasts) has proven successful results in the ventricle function. On the other side, the use of mother cells has produced the regeneration of cardiomyocytes and vascular structures as endothelial and smooth muscle cells. On June 15, 2000 in France began the first phase I human trial of autologous skeletal myoblast transplantation, in 10 patients with: 1.severe left ventricular dysfunction, 2. history of myocardial infarct with a residual discrete, akinetic and metabolically nonviable scar and 3. indication for concomitant coronary artery bypass grafting in remote ischemic myocardium. In this clinical trial 60% of the initially akinetic cell implanted scar areas demonstrated a new post-operative systolic thickening with contractility. In the world, hundreds of patients have been treated with different population cells, most of them with chronic ischemic-necrotic heart failure in which successful results have been obtained. The actual evidences suggest that in a near future the cellular cardiac implant could be a good option for the treatment of some cardiac diseases.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[MIOCITOS CARDíACOS]]></kwd>
<kwd lng="es"><![CDATA[MIOBLASTOS]]></kwd>
<kwd lng="es"><![CDATA[REVISIóN [TIPO DE PUBLICACIóN]]]></kwd>
<kwd lng="en"><![CDATA[MYOCITES, CARDIAC]]></kwd>
<kwd lng="en"><![CDATA[MYOBLASTS]]></kwd>
<kwd lng="en"><![CDATA[REVIEW [PUBLICATION TYPE]]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="left"><font color="#1f1a17" face="Verdana" size="2"><span style="text-transform: uppercase;">REVISI&oacute;N</span></font></p>      <p align="left"><font color="#ffffff" face="Verdana" size="2">Cardioimplante celular para reparar tejido card&iacute;aco: &iquest;un nuees. Daniel Bigalli, Andr&eacute;s Bico, Elvira Gossio&nbsp;</font></p>           <p align="left"><b><font color="#1f1a17" face="Verdana" size="4">Cardioimplante celular para reparar tejido card&iacute;aco:&nbsp;</font></b></p>         <p align="left"><b><font color="#1f1a17" face="Verdana">&iquest;un nuevo concepto terap&eacute;utico? </font> </b></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">DRES. DANIEL BIGALLI <a name="-1"></a></font><a href="#1"> <font color="#1f1a17" face="Verdana" size="2"><sup>1</sup></font></a><font color="#1f1a17" face="Verdana" size="2">, <span style="text-transform: uppercase;"> ANDR&eacute;S</span> BICO <sup><a name="-2"></a></sup> </font><a href="#2"> <font color="#1f1a17" face="Verdana" size="2"><sup>2</sup></font></a><font color="#1f1a17" face="Verdana" size="2">, ELVIRA GOSSIO <a name="-3"></a></font><a href="#3"> <font color="#1f1a17" face="Verdana" size="2"><sup>3</sup></font></a><font color="#1f1a17" face="Verdana" size="2"> </font></p>           <p><font color="#1f1a17" face="Verdana" size="2"><a name="1"></a> <a href="#-1">1</a>. Cirujano Card&iacute;aco. Servicio de Cirug&iacute;a Card&iacute;aca-CICU. Centro Cardiovascular del Sanatorio Casa de Galicia.    <br>   <a name="2"></a>   <a href="#-2">2</a>. Jefe de Servicio de Hemoterapia y Medicina Transfusional. Sanatorio Casa de Galicia.    <br>   <a name="3"></a>   <a href="#-3">3</a>. Jefe de Servicio de Hematolog&iacute;a. Sanatorio Casa de Galicia.    <br>      <b>Correspondencia: </b>Dr. Daniel Bigalli. Mill&aacute;n 4480. Montevideo-Uruguay. E-mail: </font><a href="mailto:dbigalli@cicu.com.uy"> <font color="#1f1a17" face="Verdana" size="2">dbigalli@cicu.com.uy</font></a></p>  <font face="Verdana" size="2">      <br>       </font>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2"><b>RESUMEN</b> </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">El concepto cl&aacute;sico de que el coraz&oacute;n es un &oacute;rgano no regenerativo ha cambiado en los &uacute;ltimos a&ntilde;os: hoy d&iacute;a se considera que el coraz&oacute;n es un &oacute;rgano en regeneraci&oacute;n continua. Los mecanismos que posee el organismo para la renovaci&oacute;n de tejidos son limitados y dependen de la rapidez de instauraci&oacute;n del da&ntilde;o.    <br>      El cardioimplante celular consiste en injertar c&eacute;lulas diferenciadas o progenitoras en el miocardio lesionado, con el fin de inducir el crecimiento de nuevas fibras musculares y el desarrollo de angiog&eacute;nesis, para mejorar y contribuir a la contracci&oacute;n sincr&oacute;nica.    <br>      Se han utilizado diferentes poblaciones celulares para tal fin, injertadas directamente en el miocardio o inyectadas en la circulaci&oacute;n.    <br>      En experimentaci&oacute;n animal, en modelos de infarto de miocardio, el implante de c&eacute;lulas aut&oacute;logas diferenciadas (cardiomiocitos embrionarios, fetales, mioblastos esquel&eacute;ticos) ha mostrado un mejoramiento en la funci&oacute;n ventricular. Por otra parte, la utilizaci&oacute;n de c&eacute;lulas madre de m&eacute;dula &oacute;sea o tejidos extramedulares ha producido la regeneraci&oacute;n de cardiomiocitos y estructuras vasculares incluyendo c&eacute;lulas endoteliales y musculares lisas.    <br>      El 15 de junio de 2000 se inici&oacute; en Francia la fase I cl&iacute;nica en diez pacientes con cardiopat&iacute;a isqu&eacute;mica necr&oacute;tica, disfunci&oacute;n ventricular izquierda severa. Los pacientes fueron tratados con implante epic&aacute;rdico de mioblastos esquel&eacute;ticos en las zonas no viables y revascularizaci&oacute;n en zonas isqu&eacute;micas remotas al implante. El 60% de las zonas no viables donde se trasplantaron los mioblastos adquirieron un aumento del espesor sist&oacute;lico y contractilidad en las zonas necr&oacute;ticas.    <br>      En el mundo ya han sido tratados cientos de pacientes, con diferentes poblaciones celulares, la mayor&iacute;a con insuficiencia card&iacute;aca secundaria a cardiopat&iacute;a isqu&eacute;mica-necr&oacute;tica, en los cuales se han obtenido resultados alentadores.    <br>      Las evidencias actuales sugieren que en un futuro cercano el cardioimplante celular podr&iacute;a ser una opci&oacute;n v&aacute;lida para el tratamiento de ciertas enfermedades card&iacute;acas. </font></p>           <p align="left"><font color="#000000" face="Verdana" size="2">PALABRAS CLAVE:</font><font color="#1f1a17" face="Verdana" size="2">&nbsp;&nbsp;&nbsp;&nbsp;</font></p>      <p align="left"><font color="#1f1a17" face="Verdana" size="2">&nbsp; &nbsp; MIOCITOS <span style="text-transform: uppercase;">CARD&iacute;ACOS</span>     ]]></body>
<body><![CDATA[<br>      &nbsp;&nbsp;&nbsp;&nbsp;MIOBLASTOS    <br>      &nbsp;&nbsp;&nbsp;&nbsp;<span style="text-transform: uppercase;">REVISI&oacute;N</span> [TIPO DE PUBLICACI&oacute;N] </font></p>           <p><font face="Verdana" size="2">    <br>      </font>      </p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><b>SUMMARY</b> </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">The classic concept that the heart is known as a non-regenerative organ has changed in the last years: today it is considered as an organ in continuous regeneration.    <br>      The mechanisms to renew tissues are limited and depend on the speed of the production of the damage.    <br>      The cellular cardiac implant consists on grafting differentiated or progenitor cells in the damaged myocardium, to achieve the growth of new muscle fibers and angiogenesis, in order to improve and help synchronic contraction.    <br>      Different cellular populations have been used to graft directly in the damaged myocardium or injected in the circulation.    <br>      In animal experimentation, in models of myocardial infarction, the autologous transplantation of differentiated cells into damaged myocardium (such as cardiomyocyte, smooth muscle cells, fibroblasts, skeletal myoblasts) has proven successful results in the ventricle function.    ]]></body>
<body><![CDATA[<br>      On the other side, the use of mother cells has produced the regeneration of cardiomyocytes and vascular structures as endothelial and smooth muscle cells.    <br>      On June 15, 2000 in France began the first phase I human trial of autologous skeletal myoblast transplantation, in 10 patients with: 1.severe left ventricular dysfunction, 2. history of myocardial infarct with a residual discrete, akinetic and metabolically nonviable scar and 3. indication for concomitant coronary artery bypass grafting in remote ischemic myocardium. In this clinical trial 60% of the initially akinetic cell implanted scar areas demonstrated a new post-operative systolic thickening with contractility.    <br>      In the world, hundreds of patients have been treated with different population cells, most of them with chronic ischemic-necrotic heart failure in which successful results have been obtained.    <br>      The actual evidences suggest that in a near future the cellular cardiac implant could be a good option for the treatment of some cardiac diseases. </font></p>           <p align="left"><font color="#000000" face="Verdana" size="2">KEY WORDS:</font></p>      <p align="left"><font color="#1f1a17" face="Verdana" size="2">&nbsp;&nbsp;&nbsp;&nbsp;MYOCITES, CARDIAC    <br>      &nbsp;&nbsp;&nbsp;&nbsp;MYOBLASTS    <br>      &nbsp;&nbsp;&nbsp;&nbsp;REVIEW [PUBLICATION TYPE] </font></p>           <p><font face="Verdana" size="2">    <br>      </font>      </p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2"><b><span style="text-transform: uppercase;">INTRODUCCI&oacute;N</span></b></font><font face="Verdana" size="2"> </font> </p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Cl&aacute;sicamente se consideraba que a los pocos meses de nacer ya pose&iacute;amos el n&uacute;mero m&aacute;ximo de cardiomiocitos, y que a partir de ese momento las c&eacute;lulas que se perd&iacute;an ya no iban a ser reemplazadas. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Este concepto cl&aacute;sico de incapacidad de replicaci&oacute;n ha cambiado en los &uacute;ltimos a&ntilde;os por los resultados obtenidos en experimentaci&oacute;n animal y en ensayos cl&iacute;nicos, que han demostrado que el coraz&oacute;n es un &oacute;rgano en regeneraci&oacute;n continua, que aumenta la producci&oacute;n de nuevas c&eacute;lulas musculares en respuesta a diferentes est&iacute;mulos fisiol&oacute;gicos y patol&oacute;gicos <sup><a name="1.-"></a><a name="2.-"></a>(<a href="#1.">1</a>,<a href="#2.">2</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Los cardiomiocitos se generan a partir de un precursor celular que se divide y da lugar a grupos de c&eacute;lulas del mismo tipo. Durante la vida fetal, estas c&eacute;lulas comienzan a diferenciarse y aparecen en su citoplasma las miofibrillas contr&aacute;ctiles, conservando su capacidad de divisi&oacute;n a pesar de encontrarse en un estadio indiferenciado. Esta capacidad se mantiene hasta los tres o cuatro meses de vida posnatal. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">En el coraz&oacute;n posnatal normal, los cardiomiocitos en mitosis son aproximadamente 14 x 10<sup>6</sup> y se estima que la p&eacute;rdida progresiva de cardiomiocitos es de 6,4 x 10<sup>6</sup> cada a&ntilde;o, lo que demuestra que a lo largo de la vida se produce un recambio lento de los mismos, a partir de c&eacute;lulas madre card&iacute;acas y de otros tejidos. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Este &iacute;ndice mit&oacute;tico normal se incrementa en presencia de ciertas enfermedades, como, por ejemplo: infarto de miocardio, cardiopat&iacute;as dilatadas idiop&aacute;ticas <sup><a name="3.-"></a>(<a href="#3.">3</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Los mecanismos que posee el organismo de regeneraci&oacute;n, reparaci&oacute;n y renovaci&oacute;n de tejidos son limitados y dependientes de la rapidez de instauraci&oacute;n del da&ntilde;o o degeneraci&oacute;n. De esta manera, la muerte de grandes cantidades de tejido de manera aguda no es susceptible de ser reparada por los mecanismos naturales del organismo debido a la escasez de c&eacute;lulas madre <a name="4.-"></a><a name="5.-"></a><a name="6.-"></a><sup>(<a href="#4.">4</a>-<a href="#6.">6</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">En la actualidad contamos con nuevas posibilidades terap&eacute;uticas basadas en la medicina regenerativa, que se propone reparar los tejidos da&ntilde;ados, utilizando mecanismos similares a los que de forma natural usa el organismo para la renovaci&oacute;n de las poblaciones celulares que van envejeciendo y que deben ser sustituidas por otras que suplen su funci&oacute;n. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las nuevas terapias basadas en el implante de c&eacute;lulas madre para regenerar tejidos enfermos constituyen actualmente una posibilidad para el tratamiento de ciertas enfermedades card&iacute;acas <sup><a name="7.-"></a><a name="8.-"></a><a name="9.-"></a><a name="10.-"></a><a name="11.-"></a><a name="12.-"></a><a name="13.-"></a><a name="14.-"></a><a name="15.-"></a>(<a href="#7.">7</a>-<a href="#15.">15</a>)</sup>. </font></p>           <p><font face="Verdana" size="2">    ]]></body>
<body><![CDATA[<br>      </font>      </p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><b><span style="text-transform: uppercase;">SELECCI&oacute;N CELULAR</span></b></font><font face="Verdana" size="2"> </font> </p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">El objetivo del cardioimplante celular es que las c&eacute;lulas trasplantadas en el tejido card&iacute;aco, alog&eacute;nicas (de la misma especie) o aut&oacute;logas (del mismo individuo), se diferencien en cardiomiocitos y participen en la mejor&iacute;a funcional de los ventr&iacute;culos afectados. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las c&eacute;lulas que poseen potencialidad para el desarrollo de la correcci&oacute;n card&iacute;aca pueden ser de variada procedencia, pero te&oacute;ricamente es posible recurrir a c&eacute;lulas naturalmente contr&aacute;ctiles, como las c&eacute;lulas del tejido card&iacute;aco o del m&uacute;sculo esquel&eacute;tico, o a c&eacute;lulas que puedan ser orientadas hacia un fenotipo contr&aacute;ctil, como las c&eacute;lulas madre embrionarias o adultas. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Aqu&iacute; se enumeran las c&eacute;lulas estudiadas que podr&iacute;an contribuir en el proceso de regeneraci&oacute;n card&iacute;aca o angiog&eacute;nesis, o ambos (<a href="#fig1">figura 1</a>). </font></p>           <p align="left"><font face="Verdana" size="2"><a name="fig1"></a><img style="width: 576px; height: 262px;" alt="" src="/img/revistas/ruc/v20n3/3a05f1.JPG"></font></p>   <font face="Verdana" size="2">       <br>   </font>       <p align="left"><font color="#1f1a17" face="Verdana" size="2">1. CARDIOMIOCITOS (EMBRIONARIOS, FETALES, ADULTOS) </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">En 1993, Koh y colaboradores, en forma experimental, demostraron el &eacute;xito del injerto de cardiomiocitos embrionarios y fetales en el tejido card&iacute;aco normal y enfermo <sup><a name="16.-"></a><a name="17.-"></a>(<a href="#16.">16</a>,<a href="#17.">17</a>)</sup>. Estas c&eacute;lulas se injertan satisfactoriamente en el miocardio, demostr&aacute;ndose posteriormente la presencia de discos intercalares y conexina 43, que son marcadores de la uni&oacute;n intracelular requerida para el acoplamiento el&eacute;ctrico entre los cardiomiocitos injertados y los nativos. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las uniones desarrolladas entre el miocardio hu&eacute;sped y las c&eacute;lulas injertadas dan por resultado una mejor funci&oacute;n sist&oacute;lica y diast&oacute;lica. </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">Otros estudios no han demostrado que se formen uniones con los cardiomiocitos del receptor<a name="18.-"></a> <sup>(<a href="#18.">18</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">La utilizaci&oacute;n de este tipo celular en la pr&aacute;ctica cl&iacute;nica es muy complicada, ya que debe ser obtenido de embriones o fetos, creando problemas en cuanto a su disponibilidad, problemas inmunol&oacute;gicos y cuestiones &eacute;ticas inherentes a su utilizaci&oacute;n <sup>(<a href="#14.">14</a>,<a href="#15.">15</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Los cardiomiocitos adultos son c&eacute;lulas terminales diferenciadas, por lo que no se dividen y no se logra expandirlos en medios de cultivo <sup><a name="19.-"></a>(<a href="#19.">19</a>)</sup>. Sin embargo, se ha identificado una poblaci&oacute;n de cardiomiocitos que proliferan en el coraz&oacute;n adulto, lo que aumenta la expectativa, si se logra estimularlos in vivo o aislarlos y multiplicarlos ex vivo, para utilizarlos en la regeneraci&oacute;n de tejido card&iacute;aco enfermo <a name="20.-"></a><sup>(<a href="#20.">20</a>)</sup>.</font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">2. C&eacute;LULAS MADRE O TRONCALES (STEM CELLS) </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">La c&eacute;lula madre (CM) o troncal se define como una c&eacute;lula progenitora con dos caracter&iacute;sticas principales: </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">1.&nbsp;&nbsp;&nbsp;&nbsp;Capacidad de proliferar durante un tiempo prolongado, dando lugar a c&eacute;lulas hijas id&eacute;nticas a ella (autorrenovaci&oacute;n). </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">2.&nbsp;&nbsp;&nbsp;&nbsp;Capacidad de diferenciarse hacia c&eacute;lulas maduras y funcionales (diferenciaci&oacute;n) <sup><a name="21.-"></a>(<a href="#21.">21</a>)</sup>. Adem&aacute;s poseen capacidad funcional de implantaci&oacute;n persistente en tejidos sanos y enfermos.<a name="22.-"></a><sup>(<a href="#22.">22</a>)</sup> </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las c&eacute;lulas madre est&aacute;n reguladas por un mecanismo de divisi&oacute;n conservador (asim&eacute;trico), de forma tal que de su divisi&oacute;n se genera una c&eacute;lula equivalente a la original y otra que da cuenta del resto del programa de diferenciaci&oacute;n. Este mecanismo de &ldquo;automantenimiento&rdquo; controla de forma estricta el n&uacute;mero de c&eacute;lulas madre que existe en un determinado &oacute;rgano. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">No todas las c&eacute;lulas madre de un &oacute;rgano participan activamente en el proceso de regeneraci&oacute;n y mantenimiento de la funcionalidad. La mayor&iacute;a se encuentra en un estado de reposo (quiescencia), lo que las protege de agresiones externas y del proceso de envejecimiento celular. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Cuando las c&eacute;lulas madre que est&aacute;n contribuyendo agotan su potencial y desaparecen, son sustituidas paulatinamente por la progenie de otras nuevas que se activan (sucesi&oacute;n clonal) <a name="23.-"></a><sup>(<a href="#23.">23</a>)</sup>. </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2"><i>2a. C&eacute;lulas madre embrionarias (CME)</i> </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Pueden aislarse de la masa celular interna del embri&oacute;n en estadio de blastocisto (7-14 d&iacute;as), y son capaces de generar &ldquo;todos&rdquo; los tipos celulares del cuerpo, es decir, son c&eacute;lulas pluripotenciales. Tienen la capacidad de proliferar en un estado indiferenciado a trav&eacute;s de un tiempo prolongado de cultivo. Pueden diferenciarse en cada tipo de tejido y formar derivados de las tres capas germinales: ectodermo, mesodermo y endodermo<a name="24.-"></a> <sup>(<a href="#24.">24</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">De estas c&eacute;lulas se derivar&aacute;, tras muchas divisiones celulares, el otro tipo de c&eacute;lulas, las c&eacute;lulas madre &oacute;rgano-espec&iacute;ficas. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">In vitro, estas c&eacute;lulas pueden diferenciarse espont&aacute;neamente a cardiomiocitos y a c&eacute;lulas endoteliales <a name="25.-"></a><a name="26.-"></a><sup>(<a href="#25.">25</a>,<a href="#26.">26</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">A pesar de sus ventajas, los problemas &eacute;ticos mayores con las c&eacute;lulas embrionarias humanas limitan su desarrollo y las aplicaciones terap&eacute;uticas. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><i>2b. C&eacute;lulas madre fetales</i> </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Se obtienen de las g&oacute;nadas de los fetos. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><i>2c. C&eacute;lulas madre del cord&oacute;n umbilical</i> </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Se obtienen de la sangre del cord&oacute;n umbilical. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><i>2d. C&eacute;lulas madre adultas (CMA)</i> </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">Las CMA han sido aisladas de diferentes tejidos del adulto: hematopoy&eacute;tico, m&uacute;sculo card&iacute;aco, m&uacute;sculo esquel&eacute;tico, gastrointestinal, renal, epid&eacute;rmico, adiposo, h&iacute;gado, pulm&oacute;n, p&aacute;ncreas, etc&eacute;tera. Eran consideradas multipotenciales, es decir, su capacidad de diferenciaci&oacute;n estar&iacute;a m&aacute;s limitada, de forma tal que una c&eacute;lula derivada del tejido mesod&eacute;rmico solo pod&iacute;a dar lugar a tejidos derivados mesod&eacute;rmicos. Sin embargo estudios recientes describiendo la plasticidad de las CMA, han conducido a intensas discusiones, donde parecer&iacute;a que alguna o todas las CMA tendr&iacute;an capacidad pluripotencial, similar a las c&eacute;lulas madre embrionarias.</font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Aunque no hay una definici&oacute;n &ldquo;oficial&rdquo; de la plasticidad de las c&eacute;lulas madre, podr&iacute;a ser definida como la capacidad de dar origen a c&eacute;lulas adquiriendo caracter&iacute;sticas morfol&oacute;gicas y funcionales de un tejido diferente de aquel del que la c&eacute;lula originariamente deriv&oacute; <sup><a name="27.-"></a><a name="28.-"></a><a name="29.-"></a>(<a href="#27.">27</a>-<a href="#29.">29</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las c&eacute;lulas madre hematopoy&eacute;ticas son capaces de diferenciarse en tejidos como m&uacute;sculo card&iacute;aco, endotelio, o en tejidos derivados de las tres capas embrionarias <sup><a name="30.-"></a><a name="31.-"></a><a name="32.-"></a>(<a href="#29.">29</a>-<a href="#32.">32</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">El trasplante de CM de la m&eacute;dula &oacute;sea en el miocardio no viable ofrece una nueva posibilidad de restauraci&oacute;n de la disfunci&oacute;n card&iacute;aca en corazones infartados <sup><a name="33.-"></a><a name="34.-"></a><a name="35.-"></a><a name="36.-"></a>(<a href="#33.">33</a>-<a href="#36.">36</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las c&eacute;lulas madre adultas pueden aislarse de la m&eacute;dula &oacute;sea o de tejidos extramedulares. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><i>A) C&eacute;lulas madre adultas de m&eacute;dula &oacute;sea</i> </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Existen cuatro l&iacute;neas celulares que pueden ser aisladas de la m&eacute;dula &oacute;sea: </font></p>       <ul>              <li><font color="#1f1a17" face="Verdana" size="2">C&eacute;lulas         madres hematopoy&eacute;ticas. </font></li>              <li><font color="#1f1a17" face="Verdana" size="2">C&eacute;lulas         madre mesenquim&aacute;ticas. </font></li>              <li><font color="#1f1a17" face="Verdana" size="2">C&eacute;lulas         poblaci&oacute;n lateral. </font></li>              ]]></body>
<body><![CDATA[<li><font color="#1f1a17" face="Verdana" size="2">C&eacute;lulas         progenitoras multipotenciales adultas. </font></li>          </ul>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">1. C&eacute;lulas madre hematopoy&eacute;ticas (CMH) </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Estas c&eacute;lulas se est&aacute;n utilizando desde hace m&aacute;s de 50 a&ntilde;os en el trasplante de m&eacute;dula &oacute;sea, y han mostrado su efectividad en el tratamiento de diversas enfermedades. En los primeros tiempos su fuente casi exclusiva era la m&eacute;dula &oacute;sea; posteriormente se extrajeron de la sangre perif&eacute;rica y del cord&oacute;n umbilical <sup><a name="37.-"></a>(<a href="#37.">37</a>)</sup>. Se a&iacute;slan de la m&eacute;dula &oacute;sea identific&aacute;ndolas por medio de marcadores de superficie: CD133<sup>+</sup>, CD34<sup>+</sup>, CD34<sup>-</sup>, CD38<sup>+</sup>, CD117<sup>+</sup> (c-kit), CD34<sup>-</sup>, CD38<sup>-</sup>, Lin<sup>-</sup> (marcadores de linaje celular) <sup><a name="38.-"></a>(<a href="#38.">38</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Varios autores se&ntilde;alan que en algunos casos se pueden expresar CD45 <a name="39.-"></a><sup>(<a href="#39.">39</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las c&eacute;lulas CD34<sup>-</sup> podr&iacute;an representar un estadio m&aacute;s primitivo que el de las CD34<sup>+</sup> <sup><a name="40.-"></a>(<a href="#40.">40</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Tambi&eacute;n es posible que algunas de las c&eacute;lulas CD34<sup>-</sup> correspondan a la subpoblaci&oacute;n medular recientemente identificada como &ldquo;poblaci&oacute;n lateral&rdquo;, que contiene una alta proporci&oacute;n de c&eacute;lulas CD34<sup>-</sup> <sup><a name="41.-"></a><a name="42.-"></a>(<a href="#29.">29</a>,<a href="#40.">40</a>-<a href="#42.">42</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las CMH son capaces de contribuir a la angiog&eacute;nesis y la vasculog&eacute;nesis in vivo de forma tal que las c&eacute;lulas CD34<sup>+</sup> no solo contienen progenitores hematopoy&eacute;ticos, sino tambi&eacute;n c&eacute;lulas progenitoras endoteliales <sup><a name="43.-"></a>(<a href="#29.">29</a>,<a href="#43.">43</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">El grupo de Anversa y Orlic ha demostrado, en un modelo de infarto de miocardio murino, que la inyecci&oacute;n de estas c&eacute;lulas en el coraz&oacute;n da&ntilde;ado da por resultado la colonizaci&oacute;n, en m&aacute;s de la mitad del &aacute;rea infartada, produciendo un mejoramiento en la contractilidad y una disminuci&oacute;n del proceso apopt&oacute;tico <sup>(<a href="#31.">31</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">El potencial de las CMH para adquirir caracter&iacute;sticas de m&uacute;sculo card&iacute;aco, esquel&eacute;tico, de neuronas adultas, y de contribuir a otros tejidos como el epitelio pulmonar, gastrointestinal, renal o de piel se ha descrito recientemente in vivo <sup><a name="44.-"></a><a name="45.-"></a><a name="46.-"></a>(<a href="#44.">44</a>-<a href="#46.">46</a>)</sup>. </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">2. C&eacute;lulas madre mesenquim&aacute;ticas (CMM) </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Son identificadas y aisladas por distintos marcadores de superficie como: SH2, SH3, CD29, CD44, CD71, CD 90, CD133 y CD106 <sup>(<a href="#31.">31</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">In vitro las CMM son capaces de diferenciarse en tejidos mesod&eacute;rmicos funcionales, como tejido card&iacute;aco, &oacute;seo, muscular esquel&eacute;tico <a name="47.-"></a><sup>(<a href="#47.">47</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Estas c&eacute;lulas pueden tener un papel potencial para el tratamiento de enfermedades card&iacute;acas, fundamentalmente para la regeneraci&oacute;n muscular. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">3. C&eacute;lulas poblaci&oacute;n lateral (del ingl&eacute;s: &ldquo;side population cells&rdquo;) </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Se han aislado de m&eacute;dula &oacute;sea y de m&uacute;sculo. Estas c&eacute;lulas son progenitores biog&eacute;nicos <sup><a name="48.-"></a>(<a href="#48.">48</a>)</sup>, a nivel experimental, en un modelo murino de infarto de miocardio, se ha logrado diferenciarlas en c&eacute;lulas con caracter&iacute;sticas de m&uacute;sculo card&iacute;aco y endotelio <sup><a name="49.-"></a>(<a href="#49.">49</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">4. C&eacute;lulas progenitoras multipotenciales adultas (del ingl&eacute;s: &ldquo;multipotent adult progenitor cells&rdquo;=MAPC) </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Esta poblaci&oacute;n celular fue descubierta en el a&ntilde;o 2002 en la Universidad de Minesota (EE.UU.). Son aut&eacute;nticas c&eacute;lulas pluripotenciales con capacidad de diferenciarse en tejidos procedentes de cualquiera de las tres capas embrionarias (endodermo, mesodermo y ectodermo), muy similar al de las c&eacute;lulas madre embrionarias <sup><a name="50.-"></a>(<a href="#39.">39</a>,<a href="#50.">50</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Por otra parte, las condiciones que se requieren para que se diferencien en tipos celulares espec&iacute;ficos no est&aacute;n totalmente esclarecidas, por lo que constituye un tema de gran inter&eacute;s y objeto de diversas investigaciones en la actualidad <a name="51.-"></a><sup>(<a href="#51.">51</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><i>B) C&eacute;lulas madre adultas de tejidos extramedulares</i> </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">1. C&eacute;lulas madre de sangre perif&eacute;rica </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Son similares a las obtenidas de la m&eacute;dula &oacute;sea <sup>(<a href="#9.">9</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Estas c&eacute;lulas aut&oacute;logas mononucleares pueden movilizarse desde la m&eacute;dula &oacute;sea, con la administraci&oacute;n de citoquinas en la forma de factores de crecimiento, por ejemplo: factor estimulante de colonias de granulocitos, estatinas y luego ser extra&iacute;das para su utilizaci&oacute;n <a name="52.-"></a><sup>(<a href="#52.">52</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">2. C&eacute;lulas madre card&iacute;acas </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Beltrami y colaboradores han demostrado, en experimentaci&oacute;n animal, que en el coraz&oacute;n adulto es posible aislar c&eacute;lulas madre multipotenciales capaces de diferenciarse in vitro e in vivo en cualquiera de los tejidos necesarios para reconstituir un coraz&oacute;n da&ntilde;ado, esto es, endotelio, m&uacute;sculo liso y m&uacute;sculo card&iacute;aco <a name="53.-"></a><sup>(<a href="#53.">53</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Si estos resultados pudieran ser reproducidos en humanos, las perspectivas terap&eacute;uticas ser&iacute;an enormes. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">3. C&eacute;lulas madre de m&uacute;sculo esquel&eacute;tico (mioblastos) </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las c&eacute;lulas sat&eacute;lite o mioblastos son las c&eacute;lulas precursoras de las fibras musculares localizadas por debajo de la membrana basal. Aunque las c&eacute;lulas sat&eacute;lite se encuentran habitualmente en estado quiescente, ante la presencia de un da&ntilde;o muscular son capaces de proliferar y diferenciarse hacia nuevas fibras musculares <sup><a name="54.-"></a>(<a href="#54.">54</a>)</sup>. Son muy resistentes a la isquemia, se multiplican despu&eacute;s de una injuria y poseen un alto poder para mitosis m&uacute;ltiples <sup><a name="55.-"></a><a name="56.-"></a>(<a href="#55.">55</a>,<a href="#56.">56</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">La posibilidad de expandir in vitro el n&uacute;mero de progenitores musculares ha permitido realizar estudios en modelos animales con infarto de miocardio en los que se han implantado mioblastos, demostrando que dichas c&eacute;lulas son capaces de injertarse y terminar su proceso de diferenciaci&oacute;n hacia fibras musculares, contribuyendo a mejorar la funci&oacute;n card&iacute;aca y la supervivencia de los animales <a name="57.-"></a><a name="58.-"></a><sup>(<a href="#56.">56</a>-<a href="#58.">58</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">A pesar del beneficio terap&eacute;utico observado en los modelos animales, existe una importante controversia sobre si las c&eacute;lulas musculares esquel&eacute;ticas implantadas en el miocardio son capaces de adquirir las caracter&iacute;sticas necesarias para poder transmitir el est&iacute;mulo electromec&aacute;nico. Mientras que algunos de los estudios iniciales indicaban que los mioblastos, una vez implantados, expresan prote&iacute;nas espec&iacute;ficas de m&uacute;sculo card&iacute;aco: conexina 43 o discos intercalares <sup><a name="59.-"></a>(<a href="#59.">59</a>)</sup>, otros m&aacute;s recientes sugieren que los mioblastos no se transdiferencian a m&uacute;sculo card&iacute;aco <sup><a name="60.-"></a><a name="61.-"></a>(<a href="#60.">60</a>,<a href="#61.">61</a>)</sup>. </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">En cualquier caso, la inyecci&oacute;n de mioblastos aut&oacute;logos en animales con infarto de miocardio ha demostrado ser eficaz y ha dado lugar al desarrollo de ensayos cl&iacute;nicos en pacientes con infarto de miocardio, en los que tambi&eacute;n se ha demostrado beneficios <sup>(<a href="#48.">48</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">4. C&eacute;lulas musculares lisas </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Pueden obtenerse de un segmento de arteria, del ap&eacute;ndice cecal o del &uacute;tero. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Estudios in vitro han demostrado la expansi&oacute;n de estas c&eacute;lulas. Luego del implante en el miocardio patol&oacute;gico, las c&eacute;lulas musculares lisas proliferan y se hipertrofian en respuesta a las contracciones <a name="62.-"></a><sup>(<a href="#62.">62</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">5. C&eacute;lulas endoteliales vasculares </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Pueden obtenerse de arterias o venas con el fin de producir angiog&eacute;nesis y neovascularizaci&oacute;n <sup><a name="63.-"></a>(<a href="#63.">63</a>)</sup>. Se han trasplantado experimentalmente c&eacute;lulas maduras endoteliales expandidas en miocardio isqu&eacute;mico. Las c&eacute;lulas endoteliales inducen un extenso plexo capilar, pero no pueden promover la formaci&oacute;n de vasos suficientes para regenerar el miocardio isqu&eacute;mico. Sin embargo, las c&eacute;lulas endoteliales bien diferenciadas de las venas umbilicales humanas forman cardiomiocitos, lo que permite plantear la utilizaci&oacute;n del cord&oacute;n umbilical como fuente de c&eacute;lulas endoteliales humanas como fin terap&eacute;utico. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Tambi&eacute;n podr&iacute;an multiplicarse ex vivo progenitores endoteliales humanos circulantes <sup><a name="64.-"></a>(<a href="#64.">64</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">6. C&eacute;lulas madre del tejido adiposo </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">El tejido adiposo, como la m&eacute;dula &oacute;sea, deriva del mes&eacute;nquima embrionario y contiene un estroma que puede ser aislado con facilidad. En esta fracci&oacute;n estromal existen c&eacute;lulas madre multipotentes que pueden diferenciarse a c&eacute;lulas adipocitarias, osteog&eacute;nicas y biog&eacute;nicas. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">A nivel experimental, estas c&eacute;lulas aisladas en el tejido adiposo del conejo y cultivadas en presencia de 5-azacitidina se transforman en c&eacute;lulas del tipo de cardiomiocito: latido espont&aacute;neo luego de tres semanas, expresi&oacute;n de cadena pesada de la miosina, de a-actinina y de la troponina <sup><a name="65.-"></a>(<a href="#65.">65</a>)</sup>. </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">Tambi&eacute;n en ratas se ha podido obtener la diferenciaci&oacute;n espont&aacute;nea a cardiomiocitos <a name="66.-"></a><sup>(<a href="#66.">66</a>)</sup>. </font></p>           <p><font face="Verdana" size="2">    <br>      </font>      </p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><b>V&iacute;AS UTILIZADAS PARA EL IMPLANTE CELULAR</b> </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Las diferentes v&iacute;as utilizadas para el cardioimplante celular son resumidas en la <a href="#tabla1">tabla 1</a>. </font></p>           <p align="left"><font color="#000000" face="Verdana" size="2">    <br>   </font></p>     <font face="Verdana" size="2">     <a name="tabla1"></a><img style="width: 321px; height: 238px;" alt="" src="/img/revistas/ruc/v20n3/3a05t1.JPG">    <br>     </font>         <p align="left">&nbsp;</p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">La v&iacute;a epic&aacute;rdica quir&uacute;rgica fue la primera utilizada en la fase cl&iacute;nica, en pacientes con insuficiencia card&iacute;aca cr&oacute;nica (isqu&eacute;mica-necr&oacute;tica). El implante celular se realiza en el espesor del tejido necr&oacute;tico-no viable por m&uacute;ltiples punciones <a name="67.-"></a><sup>(<a href="#67.">67</a>)</sup>. </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">La v&iacute;a endoventricular, a trav&eacute;s de cat&eacute;teres especiales dise&ntilde;ados para tal fin, guiados mediante mapeo electromec&aacute;nico, fluoroscop&iacute;a biplana, ultrasonido o bajo resonancia nuclear magn&eacute;tica (RNM); mediante &eacute;stos se implantan por m&uacute;ltiples punciones en el espesor del miocardio enfermo <sup><a name="68.-"></a><a name="69.-"></a><a name="70.-"></a><a name="71.-"></a>(<a href="#68.">68</a>-<a href="#71.">71</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">La v&iacute;a intravenosa sist&eacute;mica tiene la desventaja de que la distribuci&oacute;n de las c&eacute;lulas, inyectadas no es selectiva <sup><a name="72.-"></a>(<a href="#72.">72</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">La v&iacute;a intracoronaria se basa en el potencial migratorio de las c&eacute;lulas, las que son retenidas a trav&eacute;s de la membrana basal. Esta v&iacute;a es utilizada principalmente para los pacientes con IAM a los que se le realiza angioplastia primaria y luego se inyectan las c&eacute;lulas madre en la arteria tratada . Algunos trabajos han mostrado que por esta v&iacute;a se podr&iacute;an producir microembolias y potencialmente disminuir el aporte sangu&iacute;neo en pacientes isqu&eacute;micos <sup><a name="74.-"></a><a name="75.-"></a><a name="76.-"></a><a name="77.-"></a><a name="78.-"></a>(<a href="#74.">74</a>-<a href="#78.">78</a>)</sup>. Tambi&eacute;n podr&iacute;a ser &uacute;til en cardiopat&iacute;as no isqu&eacute;micas <sup>(<a href="#67.">67</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">La v&iacute;a intravenosa coronaria consiste en introducir un cat&eacute;ter especial en el seno coronario y luego se avanza el extremo del mismo hacia la vena interventricular anterior, y desde &eacute;sta se realizan las microinfusiones de las c&eacute;lulas a trav&eacute;s de m&uacute;ltiples punciones <sup><a name="73.-"></a>(<a href="#73.">73</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">ENSAYOS CL&iacute;NICOS </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">El 15 de junio de 2000, Menasch&eacute; y colaboradores <sup><a name="79.-"></a>(<a href="#79.">79</a>)</sup> iniciaron en Francia la fase I cl&iacute;nica. En este ensayo se incluyeron diez pacientes con cardiopat&iacute;a isqu&eacute;mica necr&oacute;tica, disfunci&oacute;n ventricular izquierda severa (FEVI &pound; 35%), zona necr&oacute;tica no viable, y con indicaci&oacute;n para cirug&iacute;a de revascularizaci&oacute;n en un &aacute;rea isqu&eacute;mica diferente a la zona del infarto. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Este protocolo const&oacute; de tres pasos: </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">1)&nbsp;&nbsp;&nbsp;&nbsp;Biopsia muscular del vasto lateral del muslo. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">2)&nbsp;&nbsp;&nbsp;&nbsp;Cultivo de la biopsia en el laboratorio durante dos a tres semanas hasta obtener un campo celular abundante, viable y altamente purificado (al menos 400.000.000 c&eacute;lulas con 50% de mioblastos). </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">3)&nbsp;&nbsp;&nbsp;&nbsp;Cirug&iacute;a: cardioimplante de mioblastos en la &eacute;scara posinfarto (v&iacute;a epic&aacute;rdica) y, en &aacute;reas isqu&eacute;micas remotas, revascularizaci&oacute;n con puentes coronarios. </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">Los resultados obtenidos mostraron que 60% de las &aacute;reas aquin&eacute;ticas iniciales donde se implantaron los mioblastos presentaban un nuevo espesamiento sist&oacute;lico posoperatorio. Los diez pacientes de este grupo mejoraron la FEVI en un 13% de promedio y 11 de los 18 segmentos tratados adquirieron contractilidad. Hubo una muerte temprana y cuatro pacientes presentaron en el per&iacute;odo posoperatorio taquicardia ventricular <sup><a name="80.-"></a>(<a href="#80.">80</a>)</sup>. Posteriormente se concluy&oacute; que estas arritmias hab&iacute;an sido como respuesta al suero fetal bovino, utilizado como medio de crecimiento en los cultivos de mioblastos <a name="81.-"></a><sup>(<a href="#81.">81</a>)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Desde el comienzo de la fase cl&iacute;nica, cientos de pacientes, la mayor&iacute;a con cardiopat&iacute;a isqu&eacute;mica-necr&oacute;tica, han sido tratados en el mundo con cardioimplante celular. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">En la <a href="#tabla2">tabla 2</a> se detallan los principales ensayos cl&iacute;nicos publicados en la literatura desde 2003 a 2005 en nueve pa&iacute;ses, en los que se utiliz&oacute; la v&iacute;a epic&aacute;rdica-quir&uacute;rgica para el implante de mioblastos o c&eacute;lulas madre de m&eacute;dula &oacute;sea y revascularizaci&oacute;n mioc&aacute;rdica en &aacute;reas isqu&eacute;micas diferentes a las zonas necr&oacute;ticas, la mayor&iacute;a en pacientes con cardiopat&iacute;as isqu&eacute;micas necr&oacute;ticas. </font></p>           <p align="left"><font color="#000000" face="Verdana" size="2">    <br>   </font></p>     <font face="Verdana" size="2">     <a name="tabla2"></a><img style="width: 396px; height: 487px;" alt="" src="/img/revistas/ruc/v20n3/3a05t2.JPG">    <br>     </font>         <p align="left"><font color="#1f1a17" face="Verdana" size="2">    <br>     </font></p>           <p align="left">&nbsp;</p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Si bien el n&uacute;mero de pacientes tratados no es importante, los resultados han sido satisfactorios con seguimientos de hasta dos a&ntilde;os; la mayor&iacute;a concluye que existieron cambios en las zonas no viables, observando neoangiog&eacute;nesis, incremento del espesor sist&oacute;lico de la pared, recuperaci&oacute;n funcional y en algunos casos aumento de la actividad metab&oacute;lica y viabilidad positiva <a name="90.-"></a><sup>(<a href="#80.">80</a>,<a href="#90.">90</a>)</sup>. </font></p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">En la <a href="#tabla3">tabla 3</a> se detallan ensayos cl&iacute;nicos, desde &nbsp;2002 a 2004, utilizando la v&iacute;a intracoronaria, todos ellos en pacientes convalecientes de infartos agudos, a quienes se les realiz&oacute; angioplastia de rescate y posteriormente la inyecci&oacute;n de c&eacute;lulas madre (de m&eacute;dula &oacute;sea o de sangre perif&eacute;rica) en el vaso tratado. Seguimiento de hasta 12 meses, con resultados favorables, demostrando un incremento de la motilidad parietal y aumento de la perfusi&oacute;n mioc&aacute;rdica <sup>(110-114)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">    <br>   </font></p>     <font face="Verdana" size="2">     <a name="tabla3"></a><img style="width: 484px; height: 419px;" alt="" src="/img/revistas/ruc/v20n3/3a05t3.JPG">    <br>       </font>           <p align="left">&nbsp;</p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">En la <a href="#tabla4">tabla 4</a> se observan los ensayos cl&iacute;nicos en los que se utilizaron las v&iacute;as transendoc&aacute;rdica y transvenosa coronaria <sup>(119)</sup>, en pacientes con patolog&iacute;a isqu&eacute;mica necr&oacute;tica. Los autores tambi&eacute;n observaron resultados alentadores <sup>(115-120)</sup>. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">    <br>   </font></p>     <font face="Verdana" size="2">     <a name="tabla4"></a><img style="width: 444px; height: 479px;" alt="" src="/img/revistas/ruc/v20n3/3a05t4.JPG">    <br>     </font>         <p align="left">&nbsp;</p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2">En la mayor&iacute;a de estos estudios los investigadores utilizaron poblaciones celulares heterog&eacute;neas, n&uacute;mero de c&eacute;lulas injertadas diferentes, distintas t&eacute;cnicas de implante, lo que limita de forma importante las conclusiones, ya que no es posible determinar cu&aacute;les son exactamente las c&eacute;lulas responsables del beneficio terap&eacute;utico. </font></p>           <p><font face="Verdana" size="2">    <br>      </font>      </p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><b><span style="text-transform: uppercase;">ANGIOG&eacute;NESIS</span> COMO COADYUVANTE     <br>      DEL TRASPLANTE CELULAR </b></font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Recientemente se ha puesto de manifiesto el inter&eacute;s de promover angiog&eacute;nesis card&iacute;aca por medio del trasplante de c&eacute;lulas endoteliales vasculares o c&eacute;lulas progenitoras endoteliales <sup><a name="99.-"></a><a name="100.-"></a><a name="101.-"></a>(<a href="#15.">15</a>,<a href="#99.">99</a>-<a href="#101.">101</a>)</sup>. Esta posibilidad encierra un potencial importante como coadyuvante del trasplante celular biog&eacute;nico, con el fin de inducir angiog&eacute;nesis en el miocardio lesionado, debido a que la mortalidad de las c&eacute;lulas despu&eacute;s del implante en las &aacute;reas fibr&oacute;ticas puede ser alta, por los bajos niveles de ox&iacute;geno y nutrientes. </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">De all&iacute; que la terapia basada en c&eacute;lulas angiog&eacute;nicas es un desarrollo importante para tratar la isquemia del miocardio debido a la inestabilidad y las respuestas adversas que se presentan a los vectores angiog&eacute;nicos de la terapia g&eacute;nica <sup><a name="102.-"></a>(<a href="#102.">102</a>)</sup> y las limitaciones en el empleo de los factores de crecimiento, los que presentan riesgos de efectos sist&eacute;micos (angiog&eacute;nesis de retina, hiperplasia de la &iacute;ntima arterial con desarrollo de placas de ateromas y potenciaci&oacute;n en el crecimiento y en las met&aacute;stasis de tumores ocultos). </font></p>           <p align="left"><font color="#1f1a17" face="Verdana" size="2">Existen dos modalidades para producir angiog&eacute;nesis: 1) terapia g&eacute;nica utilizando adenovirus como vectores con la administraci&oacute;n de factores de crecimiento angiog&eacute;nicos (factor de crecimiento endotelial vascular, factor de crecimiento fibrobl&aacute;stico, factor de crecimiento hepatoc&iacute;tico), y 2) el trasplante celular, utilizando c&eacute;lulas madre mesenquim&aacute;ticas o hematopoy&eacute;ticas, principalmente c&eacute;lulas progenitoras endoteliales (CD 34+) <sup><a name="103.-"></a>(<a href="#103.">103</a>)</sup>. Ambas han mostrado ser efectivas, mejorando el flujo sangu&iacute;neo colateral en el miocardio isqu&eacute;mico <a name="104.-"></a><a name="105.-"></a><a name="106.-"></a><sup>(<a href="#104.">104</a>-<a href="#106.">106</a>)</sup>. </font></p>           <p><font face="Verdana" size="2">    <br>      </font>      </p>           ]]></body>
<body><![CDATA[<p align="left"><font color="#1f1a17" face="Verdana" size="2"><b>CONCLUSIONES</b> </font></p>       <ul>              <li><font color="#1f1a17" face="Verdana" size="2">Los         resultados obtenidos en experimentaci&oacute;n animal y en         ensayos cl&iacute;nicos han demostrado que el coraz&oacute;n se         encuentra en un proceso continuo de crecimiento, muerte y         renovaci&oacute;n. </font></li>              <li><font color="#1f1a17" face="Verdana" size="2">El         uso de c&eacute;lulas madre multipotentes, capaces de         diferenciarse en cualquier tipo celular, se presenta como         una estrategia terap&eacute;utica prometedora. Sin embargo, el         tipo celular &oacute;ptimo, n&uacute;mero de c&eacute;lulas a implantar,         v&iacute;as de implante y la poblaci&oacute;n de pacientes no han         sido a&uacute;n identificados. </font></li>              <li><font color="#1f1a17" face="Verdana" size="2">La         mayor&iacute;a de las evidencias sugieren que en un futuro         cercano el cardioimplante celular podr&iacute;a ser una opci&oacute;n         v&aacute;lida para el tratamiento de ciertas enfermedades         card&iacute;acas. </font></li>              <li>                             <div style="text-align: left;"><font face="Verdana" size="2">    <br>                      </font>                      </div>                             <ul>                                                        </ul>                                           <p align="left"><font color="#1f1a17" face="Verdana" size="2"><b>BIBLIOGRAF&iacute;A</b> </font></p>                                           <!-- ref --><p align="left"><font color="#1f1a17" face="Verdana" size="2"><a name="1."></a><a href="#1.-">1</a>.&nbsp;&nbsp;&nbsp;&nbsp;<b>Anversa         P, Kajstura J</b>. 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</article>
