<?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>0034-7493</journal-id>
<journal-title><![CDATA[Revista Cubana de Cirugía]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cubana Cir]]></abbrev-journal-title>
<issn>0034-7493</issn>
<publisher>
<publisher-name><![CDATA[Editorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-74932007000300011</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Terapia angiogénica en el tratamiento de la cardiopatía isquémica]]></article-title>
<article-title xml:lang="en"><![CDATA[Angiogenic therapy in the ischemic cardiopathy treatment]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villar Inclán]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Hospital Clinicoquirúrgico Hermanos Ameijeiras  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2007</year>
</pub-date>
<volume>46</volume>
<numero>3</numero>
<fpage>0</fpage>
<lpage>0</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-74932007000300011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-74932007000300011&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-74932007000300011&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Se realizó un recorrido por la historia del uso de los factores de crecimiento y se analizaron los conceptos de angiogénesis, arteriogénesis y vasculogénesis. Se señalaron los diferentes factores de crecimiento que se conocen y se hizo especial énfasis en los más utilizados (factor de crecimiento endotelial vascular y el factor de crecimiento fibroblástico). Se analizaron las diferentes vías de aplicación de estos, así como la forma de administración (proteica o génica). Realizamos un recuento de los diferentes estudios preclínicos y clínicos con el uso de estos factores de crecimiento para el tratamiento de la cardiopatía isquémica. De los diferentes estudios se recogieron las posibles complicaciones del uso de estos factores, llegamos a conclusiones y planteamos recomendaciones]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The history of the use of growth factors and the concepts of angiogenesis, arteriogenesis and vasculogenesis were presented in this paper. The different growth factors that are known so far were stated, making emphasis on the most used (vascular endothelial and fibroblast growth factors). The various ways of application and of administration proteic or genic) were analyzed. An account of several preclinical and clinical studies using these growth factors for ischemic cardiopathy treatment were made. The various studies contributed information on the possible complications of the use of these factors; conclusions were drawn and recommendations were made]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Factores de crecimiento]]></kwd>
<kwd lng="es"><![CDATA[angiogénesis]]></kwd>
<kwd lng="es"><![CDATA[factor de crecimiento endotelial vascular]]></kwd>
<kwd lng="en"><![CDATA[growth factors]]></kwd>
<kwd lng="en"><![CDATA[angiogenesis]]></kwd>
<kwd lng="en"><![CDATA[vascular endothelial growth factor]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <h3><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'>Trabajos de   revisi&oacute;n   <o:p></o:p> </span></h3>     <p>Hospital Clinicoquir&uacute;rgico &laquo;Hermanos Ameijeiras&raquo;</p> <h2><strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family: &quot;Times New Roman&quot;'>Terapia angiog&eacute;nica en el tratamiento de la cardiopat&iacute;a   isqu&eacute;mica</span></strong><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'>   <o:p></o:p> </span></h2>     <p><a href="#cargo"><b><span style='font-size:8.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;'>Dr.   Alejandro Villar Incl&aacute;n</span></b><span class="superscript1"><span style='font-size:8.0pt'>1</span></span></a><a name="autor" id="autor"></a></p> <blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'>       <p>     <o:p>&nbsp;</o:p>   </p>   <hr />   <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'>RESUMEN     <o:p></o:p>   </span></h4>       <p style='text-align:justify'>Se realiz&oacute; un recorrido por la historia del uso     de los factores de crecimiento y se analizaron los conceptos de angiog&eacute;nesis,     arteriog&eacute;nesis y vasculog&eacute;nesis. Se se&ntilde;alaron los diferentes factores de     crecimiento que se conocen y se hizo especial &eacute;nfasis en los m&aacute;s utilizados     (factor de crecimiento endotelial vascular y el factor de crecimiento     fibrobl&aacute;stico). Se analizaron las diferentes v&iacute;as de aplicaci&oacute;n de estos, as&iacute;     como la forma de administraci&oacute;n (proteica o g&eacute;nica). Realizamos un recuento de     los diferentes estudios precl&iacute;nicos y cl&iacute;nicos con el uso de estos factores de     crecimiento para el tratamiento de la cardiopat&iacute;a isqu&eacute;mica. De los diferentes     estudios se recogieron las posibles complicaciones del uso de estos factores,     llegamos a conclusiones y planteamos recomendaciones.</p>       <p><em>Palabras clave</em>: Factores de crecimiento, angiog&eacute;nesis, factor de     crecimiento endotelial vascular.</p>   <hr />       <p>&nbsp;</p> </blockquote>     <p align="justify">En los &uacute;ltimos a&ntilde;os, una parte importante de las investigaciones se ha   centrado en la administraci&oacute;n de factores de crecimiento angiog&eacute;nicos para   promover el desarrollo de vasos sangu&iacute;neos colaterales suplementarios que   actuar&iacute;an como conductos de derivaci&oacute;n end&oacute;genos alrededor de las arterias   nativas ocluidas, lo cual se conoce como <em>angiog&eacute;nesis terap&eacute;utica</em>. En   un n&uacute;mero considerable de ensayos precl&iacute;nicos de isquemia esta estrategia ha   demostrado aumentar la perfusi&oacute;n tisular mediante neovascularizaci&oacute;n. En   pacientes con isquemia cr&iacute;tica de las extremidades inferiores o con enfermedad   arterial coronaria terminal, los ensayos cl&iacute;nicos han demostrado una mejor&iacute;a   sintom&aacute;tica y han aportado una evidencia objetiva de mejorar la perfusi&oacute;n, lo   que sugiere que esto pudiera constituir un m&eacute;todo alternativo de tratamiento en   pacientes en los que las terapias actualmente disponibles han fallado o no son   viables.</p>     <p align="justify">Los pr&oacute;ximos objetivos de la investigaci&oacute;n en el campo de la angiog&eacute;nesis   van a encaminarse a determinar las dosis &oacute;ptimas de utilizaci&oacute;n, la ruta de   administraci&oacute;n, el uso de la combinaci&oacute;n de factores de crecimiento, el uso de   c&eacute;lulas madres con factores de crecimiento y a proporcionar una angiog&eacute;nesis   terap&eacute;utica efectiva y segura, as&iacute; como a adaptar la angiog&eacute;nesis a las   necesidades individuales de los pacientes.</p>     <p align="justify">El t&eacute;rmino <em>angiog&eacute;nesis terap&eacute;utica </em>fue sugerido inicialmente por <em>Hockel</em> y colaboradores en 1993,<span class="superscript1"><span style='font-size:8.0pt'>1</span></span> quienes lo utilizaron para describir la inducci&oacute;n o estimulaci&oacute;n de neovascularizaci&oacute;n   orientada al tratamiento o prevenci&oacute;n de situaciones patol&oacute;gicas caracterizadas   por hipoperfusi&oacute;n local o regional. Es decir, representa el uso terap&eacute;utico de   agentes biol&oacute;gicos, materiales bioactivos o condiciones del medio ambiente destinados   a estimular el crecimiento de nuevos vasos sangu&iacute;neos con el fin de restaurar o   aumentar la perfusi&oacute;n de determinados tejidos, revertir la isquemia o acelerar   la cicatrizaci&oacute;n.</p>     ]]></body>
<body><![CDATA[<p>La angiog&eacute;nesis como talfue documentada en 1935 por el pat&oacute;logo <em>Arthur</em> <em>Hertig, </em>en la descripci&oacute;n de la formaci&oacute;n de nuevos vasos sangu&iacute;neos   en la placenta;<span class="superscript1"><span style='font-size:8.0pt'>2</span></span> mientras que en 1945, <em>Algire</em> y <em>Chalkley,</em> bas&aacute;ndose en   observaciones microsc&oacute;picas del comportamiento de xenoinjertos tumorales   implantados en ratones, propusieron que el crecimiento de tumores s&oacute;lidos   depend&iacute;a del desarrollo de un nuevo abastecimiento vascular derivado del   hu&eacute;sped.<span class="superscript1"><span style='font-size:8.0pt'>3</span></span> Por otro lado, <em>Folkman,</em><span class="superscript1"><span style='font-size:8.0pt'>4</span></span> hace como 30 a&ntilde;os, sugiri&oacute; las nuevas   implicaciones terap&eacute;uticas de la inhibici&oacute;n del proceso angiog&eacute;nico en   pacientes oncol&oacute;gicos.</p>     <p>En la tabla 1 ponemos a su consideraci&oacute;n un cronograma del proceso del   conocimiento y del uso de los factores de crecimientos.</p>     <p align="center" style='text-align:center'><strong>Tabla 1. </strong><em>Historia   de los factores de crecimiento</em></p>     <div align="center">   <table class="MsoNormalTable" border="1" cellspacing="3" cellpadding="0" width="90%"  style='width:90.0%;mso-cellspacing:2.2pt;mso-yfti-tbllook:1184;mso-padding-alt:  0cm 0cm 0cm 0cm'>     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1935</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>El t&eacute;rmino         de angiog&eacute;nesis lo acu&ntilde;&oacute; el pat&oacute;logo Arthur Herting para describir la         formaci&oacute;n de nuevos vasos en la placenta.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:1'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1939</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Ide y         cols. postularon la existencia de un factor de estimulaci&oacute;n de crecimiento de         vasos sangu&iacute;neos derivados del tumor.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:2'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1948</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Michaelson         propuso que un factor angiog&eacute;nico, &laquo;factor X&raquo;, producido por la retina, era         el responsable de la neovascularizaci&oacute;n de la retina que ocurre en la         retinopat&iacute;a diab&eacute;tica.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:3'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    ]]></body>
<body><![CDATA[<p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1968</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Primer         experimento de prueba directa de la hip&oacute;tesis de que los tumores produc&iacute;an         factores angiog&eacute;nicos.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:4'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1971</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Folkman         propone que la antiangiog&eacute;neis pudiera ser una v&iacute;a alternativa para el         tratamiento del c&aacute;ncer.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:5'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1983</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Singer         describe el factor de permeabilidad vascular del tumor (VPF).                 <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:6'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1985</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>La         secuencia del factor de crecimiento de fibroblasto (FGF) fue reportada.                 <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:7'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1989</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Ferrara y         Henzel hablan por primera vez del factor de crecimiento endotelial&nbsp;         vascular (VEGF), mientras que Conolly reporta que el VEGF y el VPF son la         misma mol&eacute;cula.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:8'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    ]]></body>
<body><![CDATA[<p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1992</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Primeros estudios         en animales con el uso del FGF, que demostraron el efecto de angiog&eacute;nesis.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:9'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1993</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Hockel         sugiere el t&eacute;rmino de angiog&eacute;neis terap&eacute;utica con el objetivo de estimular la         neovascularizaci&oacute;n en situaciones de hipoperfusi&oacute;n.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:10'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1995</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Isner y         cols. publicaron los ensayos cl&iacute;nicos realizados con la aplicaci&oacute;n de         factores de crecimiento en isquemia de miembros inferiores.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:11'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1994</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Takeshita         y cols. hablan sobre el uso del VEGF en isquemia de miembros inferiores del         conejo.                 <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:12'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1998</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Administraci&oacute;n         del VEGF en animales, como el puerco, para modelos de isquemia mioc&aacute;rdica.         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:13;mso-yfti-lastrow:yes'>       <td width="102" valign="top" style='width:76.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    ]]></body>
<body><![CDATA[<p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>1998</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="510" valign="top" style='width:382.5pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Schumacher         public&oacute; la primera terap&eacute;utica angiog&eacute;nica en la cardiopat&iacute;a isqu&eacute;mica en         seres humanos, con el uso del FGF junto con revascularizaci&oacute;n coronaria,         mientras Losordo lo publica con el uso del VEGF 165.         <o:p></o:p>       </span></p></td>     </tr>   </table> </div>     <p>&nbsp;</p> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'>Angiog&Eacute;nesis,   arteriog&Eacute;nesis y vasculog&Eacute;nesis   <o:p></o:p> </span></h4>     <p>Se han definido tres t&eacute;rminos que supuestamente hacen referencia a procesos   distintos involucrados en los mecanismos del desarrollo vascular: angiog&eacute;nesis,   arteriog&eacute;nesis y vasculog&eacute;nesis.<span class="superscript1"><span style='font-size:8.0pt'>5</span></span></p>     <p>Se acepta el t&eacute;rmino <em>angiog&eacute;nesis</em> como el desarrollo de nuevos   vasos de peque&ntilde;o calibre que emergen en forma de brotes a partir de capilares o   v&eacute;nulas poscapilares preexistentes y que est&aacute;n compuestos s&oacute;lo por una capa   delgada de endoteliocitos.<span class="superscript1"><span style='font-size:8.0pt'>6,7</span></span></p>     <p>La <em>arteriog&eacute;nesis</em>, se refiere al desarrollo de vasos de mayor   calibre, con una t&uacute;nica media bien desarrollada que rodea a los endoteliocitos   y que est&aacute; compuesta por c&eacute;lulas musculares lisas. Por lo tanto, estos vasos   constituyen arteriolas o vasos arteriales y crecen a partir de anastomosis   arteriolares preexistentes.<span class="superscript1"><span style='font-size: 8.0pt'>5</span></span> Este es el proceso en el que est&aacute; involucrado el   desarrollo de la llamada circulaci&oacute;n colateral epic&aacute;rdica.<span class="superscript1"><span style='font-size:8.0pt'>8,9</span></span></p>     <p>El t&eacute;rmino <em>vasculog&eacute;nesis</em>, en cambio, ha sido reservado para el   desarrollo embriol&oacute;gico de grandes vasos sangu&iacute;neos a partir de las c&eacute;lulas   mesenquim&aacute;ticas o c&eacute;lulas precursoras inmaduras (hemangioblastos o   angioblastos).<span class="superscript1"><span style='font-size:8.0pt'>10</span></span> Sin embargo se ha comprobado recientemente que este proceso no es exclusivo del   desarrollo prenatal temprano, como antes se cre&iacute;a, sino que tambi&eacute;n puede   ocurrir en la vida posnatal,<span class="superscript1"><span style='font-size: 8.0pt'>11,12</span></span> por ejemplo, en el ciclo endometrial, en el   desarrollo placentario, en el miocardio isqu&eacute;mico o en miembros con   arteriopat&iacute;a perif&eacute;rica grave.<span class="superscript1"><span style='font-size: 8.0pt'>13</span></span></p>     <p>Los mecanismos se&ntilde;alados anteriormente son a los que recurre el coraz&oacute;n para   compensar la enfermedad isqu&eacute;mica. Por lo tanto, estos fen&oacute;menos cumplen un rol   adaptativo muy importante en pacientes con cardiopat&iacute;a isqu&eacute;mica de larga   duraci&oacute;n, en los cuales la circulaci&oacute;n colateral mantiene un flujo   indispensable para suplir las demandas card&iacute;acas en reposo.<span class="superscript1"><span style='font-size:8.0pt'>14</span></span> Las   consecuencias de la enfermedad card&iacute;aca isqu&eacute;mica depender&aacute;n del tiempo de   progreso de la enfermedad<span class="superscript1"><span style='font-size:8.0pt'>15</span></span> y del desarrollo de una circulaci&oacute;n colateral.<span class="superscript1"><span style='font-size:8.0pt'>16</span></span> El objetivo de la angiog&eacute;nesis   terap&eacute;utica es controlar estos fen&oacute;menos complejos en bienestar del paciente.</p>     <p>En la tabla siguiente mostramos las diferencias, a grandes rasgos, entre los   procesos de vasculog&eacute;nesis, arteriog&eacute;nesis y angiog&eacute;nesis</p>     <p align="center" style='text-align:center'><strong>Tabla 2. </strong><em>Diferencias   entre vasculog&eacute;nesis, arteriog&eacute;nesis y angiog&eacute;nesis</em></p>     ]]></body>
<body><![CDATA[<div align="center">   <table class="MsoNormalTable" border="1" cellspacing="3" cellpadding="0" width="90%"  style='width:90.0%;mso-cellspacing:2.2pt;mso-yfti-tbllook:1184;mso-padding-alt:  0cm 0cm 0cm 0cm'>     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>       <td width="139" valign="top" style='width:104.25pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><strong><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>&nbsp;</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="156" valign="top" style='width:117.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Vasculog&eacute;neis</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="192" valign="top" style='width:144.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Arteriog&eacute;nesis</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="153" valign="top" style='width:114.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Angiog&eacute;nesis</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:1'>       <td width="139" valign="top" style='width:104.25pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>C&eacute;lulas         envueltas                 <o:p></o:p>       </span></p></td>       <td width="156" valign="top" style='width:117.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>C&eacute;lulas endoteliales madres                 <o:p></o:p>       </span></p></td>       <td width="192" valign="top" style='width:144.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>C&eacute;lulas endoteliales, m&uacute;sculo liso,         periocitos, otras                 <o:p></o:p>       </span></p></td>       <td width="153" valign="top" style='width:114.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>C&eacute;lulas endoteliales                 <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:2'>       <td width="139" valign="top" style='width:104.25pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Est&iacute;mulo         primario                 <o:p></o:p>       </span></p></td>       <td width="156" valign="top" style='width:117.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    ]]></body>
<body><![CDATA[<p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Desarrollo                 <o:p></o:p>       </span></p></td>       <td width="192" valign="top" style='width:144.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>No conocido (&iquest;inflamaci&oacute;n?)         <o:p></o:p>       </span></p></td>       <td width="153" valign="top" style='width:114.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Isquemia, inflamaci&oacute;n         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:3'>       <td width="139" valign="top" style='width:104.25pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Resultados         finales                 <o:p></o:p>       </span></p></td>       <td width="156" valign="top" style='width:117.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Formaci&oacute;n de un vaso sangu&iacute;neo                 <o:p></o:p>       </span></p></td>       <td width="192" valign="top" style='width:144.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Arteriola                 <o:p></o:p>       </span></p></td>       <td width="153" valign="top" style='width:114.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Capilar                 <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:4'>       <td width="139" valign="top" style='width:104.25pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Ocurre en         tejido adulto                 <o:p></o:p>       </span></p></td>       <td width="156" valign="top" style='width:117.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>No est&aacute; claro (m&iacute;nimo)                 <o:p></o:p>       </span></p></td>       <td width="192" valign="top" style='width:144.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>S&iacute;                 <o:p></o:p>       </span></p></td>       <td width="153" valign="top" style='width:114.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    ]]></body>
<body><![CDATA[<p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>S&iacute;                 <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:5'>       <td width="139" valign="top" style='width:104.25pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Contribuye         a la perfusi&oacute;n efectiva         <o:p></o:p>       </span></p></td>       <td width="156" valign="top" style='width:117.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>No est&aacute; claro (m&iacute;nimo)                 <o:p></o:p>       </span></p></td>       <td width="192" valign="top" style='width:144.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Mayor         <o:p></o:p>       </span></p></td>       <td width="153" valign="top" style='width:114.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Menor         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:6;mso-yfti-lastrow:yes'>       <td width="139" valign="top" style='width:104.25pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Factores         envueltos                 <o:p></o:p>       </span></p></td>       <td width="156" valign="top" style='width:117.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>VEGF, Ang-1, Ang-2                 <o:p></o:p>       </span></p></td>       <td width="192" valign="top" style='width:144.0pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>PDGF, Ang-1, Ang-2, &iquest;FGF?                 <o:p></o:p>       </span></p></td>       <td width="153" valign="top" style='width:114.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>FGF 1,2,4,5 <br />         VEGF 1,2,3                 <o:p></o:p>       </span></p></td>     </tr>   </table> </div> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'><br />   Los factores de crecimiento       <o:p></o:p> </span></h4>     <p>Los factores de crecimiento (FC) son mol&eacute;culas que regulan la migraci&oacute;n,   proliferaci&oacute;n, diferenciaci&oacute;n y crecimiento celular, y est&aacute;n codificados por   ciertos protooncogenes. Estas mol&eacute;culas cumplen su funci&oacute;n tanto paracrina como   autocrina. Al ser activados, los receptores espec&iacute;ficos para los FC generan una   cascada intracelular de transducci&oacute;n de se&ntilde;ales en la que participan otras   mol&eacute;culas llamadas <em>segundos mensajeros</em>. Generalmente, el paso final es   la activaci&oacute;n de factores de trascripci&oacute;n quen regula la transcripci&oacute;n y la   traducci&oacute;n de genes espec&iacute;ficos.<span class="superscript1"><span style='font-size:8.0pt'>17</span></span></p>     ]]></body>
<body><![CDATA[<p>Existen diversos FC que est&aacute;n involucrados en el proceso angiog&eacute;nico,<span class="superscript1"><span style='font-size:8.0pt'>18</span></span> ya sea   estimul&aacute;ndolo o inhibi&eacute;ndolo. Adem&aacute;s, algunos FC act&uacute;an de manera sin&eacute;rgica o   cooperativa para inducir la formaci&oacute;n de nuevos vasos.<span class="superscript1"><span style='font-size:8.0pt'>19</span></span></p>     <p>Un delicado y din&aacute;mico balance entre estos p&eacute;ptidos estimuladores e   inhibidores mantiene una estrecha regulaci&oacute;n del complejo proceso.<span class="superscript1"><span style='font-size:8.0pt'>20</span></span> Los FC son   tambi&eacute;n importantes mediadores que intervienen en los procesos de inflamaci&oacute;n,   cicatrizaci&oacute;n y remodelamiento tisula.<span class="superscript1"><span style='font-size:8.0pt'>21-23</span></span> M&aacute;s a&uacute;n, los resultados de estudios   recientes sugieren que el proceso angiog&eacute;nico depende necesariamente de la   presencia de c&eacute;lulas inflamatorias.<span class="superscript1"><span style='font-size:8.0pt'>24-27</span></span></p>     <p>Actualmente, la metodolog&iacute;a utilizada en la terapia angiog&eacute;nica de las   enfermedades cardiovasculares est&aacute; destinada a modular la acci&oacute;n de los   factores de crecimiento.<span class="superscript1"><span style='font-size:8.0pt'>28</span></span> A pesar de que el proceso angiog&eacute;nico est&aacute;, como ya dijimos, altamente   regulado, aparentemente s&oacute;lo el aumento de la concentraci&oacute;n de un FC   (&lsquo;upregulation&rsquo;) es suficiente para activar toda la cascada de eventos   necesarios para el crecimiento de nuevos vasos sangu&iacute;neos.<span class="superscript1"><span style='font-size:8.0pt'>29</span></span></p>     <p>De todos los factores angiog&eacute;nicos conocidos, los m&aacute;s utilizados a nivel   experimental son los factores de crecimiento fibrobl&aacute;stico(FGF, del ingl&eacute;s   &lsquo;fibroblast growth factor&rsquo;) y el factor de crecimiento del endotelio   vascular(VEGF, del ingl&eacute;s &lsquo;vascular endothelial growth factor&rsquo;).</p>     <p><strong>&nbsp;</strong></p> <h4><strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family: &quot;Times New Roman&quot;'>Factores de crecimiento fibrobl&Aacute;stico</span></strong><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'>   <o:p></o:p> </span></h4>     <p>Los factores de crecimiento fibrobl&aacute;stico son una gran familia de prote&iacute;nas   con propiedades mitog&eacute;nicas, gen&eacute;ticamente relacionadas<span class="superscript1"><span style='font-size:8.0pt'>30</span></span> y con alta   afinidad por la heparina (HBGF, del ingl&eacute;s &lsquo;heparin-binding growth factors&rsquo;).<span class="superscript1"><span style='font-size:8.0pt'>31</span></span></p>     <p>Estas mol&eacute;culas comparten caracter&iacute;sticas estructurales, bioqu&iacute;micas y   funcionales, y poseen la capacidad de estimular diferentes tipos celulares,   incluyendo c&eacute;lulas endoteliales, c&eacute;lulas del m&uacute;sculo liso vascular,   fibroblastos, miocardiocitos y ciertas c&eacute;lulas tumorales.<span class="superscript1"><span style='font-size:8.0pt'>32</span></span> Todas estas   c&eacute;lulas expresan por lo menos uno de los cuatro receptores tirosina-cinasa   (FGFR, del ingl&eacute;s &lsquo;fibroblast growth factor receptor&rsquo; = receptor para el FGF)   conocidos hasta el momento: FGFR-1, FGFR-2, FGFR-3 y FGFR-4.<span class="superscript1"><span style='font-size:8.0pt'>30,33</span></span> Estas   prote&iacute;nas transmembrana son conocidas como receptores de alta afinidad para el   FGF.</p>     <p>Los prototipos de esta familia son los dos primeros p&eacute;ptidos descriptos: el   FGF &aacute;cido (aFGF) y el FGF b&aacute;sico (bFGF).<span class="superscript1"><span style='font-size:8.0pt'>34</span></span> Estas prote&iacute;nas de cadena &uacute;nica son   conocidas actualmente como FGF-1 (de 154 amino&aacute;cidos) y FGF-2 (de 146 amino   &aacute;cidos), respectivamente, y son los dos factores de crecimiento fibrobl&aacute;stico   m&aacute;s utilizados en los estudios experimentales de angiog&eacute;nesis terap&eacute;utica. Con   respecto a los otros miembros de esta familia, existen por lo menos 18 p&eacute;ptidos   caracterizados: los factores de crecimiento fibrobl&aacute;stico &laquo;oncog&eacute;nicos&raquo; (FGF-3,   FGF-4, FGF-5 y FGF-6), los factores de crecimiento de queratinocitos (FGF-7,   FGF-8, FGF-9 y FGF-10) y los factores de crecimiento fibrobl&aacute;stico &laquo;hu&eacute;rfanos&raquo;   (FGF-11 a FGF-18, acerca de cuya funci&oacute;n biol&oacute;gica no hay certeza).<span class="superscript1"><span style='font-size:8.0pt'>32</span></span></p>     <p>El efecto angiog&eacute;nico de los prototipos de esta familia de FC (FGF-1 y   FGF-2) es uno de los m&aacute;s documentados, ya que su papel en todas las etapas de   la neoformaci&oacute;n vascular es destacada por un lado, estimula la producci&oacute;n de   enzimas proteol&iacute;ticas necesarias para la lisis de la membrana basal y de la   matriz extracelular; y por otra parte, estimula la proliferaci&oacute;n y migraci&oacute;n de   las c&eacute;lulas endoteliales e induce su organizaci&oacute;n tubular.<span class="superscript1"><span style='font-size:8.0pt'>32</span></span></p>     <p>La combinaci&oacute;n <em>in vitro</em> de bFGF y de VEGF representa, quiz&aacute;s, el   m&aacute;s poderoso est&iacute;mulo angiog&eacute;nico conocido hasta la fecha.<span class="superscript1"><span style='font-size:8.0pt'>35,36</span></span> Adem&aacute;s, el   bFGF estimula la expresi&oacute;n de VEGF.<span class="superscript1"><span style='font-size:8.0pt'>37</span></span></p> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'><br />       <strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>El factor de crecimiento         del endotelio vascular</span></strong>   <o:p></o:p> </span></h4>     ]]></body>
<body><![CDATA[<p>El factor de crecimiento del endotelio vascular (VEGF) es una glucoprote&iacute;na   homodim&eacute;rica de 34 a 46 kD, tambi&eacute;n mitog&eacute;nica pero de acci&oacute;n casi exclusiva   sobre las c&eacute;lulas endoteliales, las cuales expresan los receptores espec&iacute;ficos   VEGFR-1,<span class="superscript1"><span style='font-size:8.0pt'>38,39</span></span> quien genera se&ntilde;ales de ensamblaje de las c&eacute;lulas endoteliales en tubos y vasos   funcionales, VEGFR-2<span class="superscript1"><span style='font-size:8.0pt'>40,41,42</span></span> responsable de la proliferaci&oacute;n y migraci&oacute;n y el VEGFR -3<span class="superscript1"><span style='font-size:8.0pt'>43,44</span></span> que media   la linfagiog&eacute;nesis.</p>     <p>Anteriormente, este p&eacute;ptido era conocido como vasculotropina o factor de   permeabilidad vascular (VPF, del ingl&eacute;s &lsquo;vascular permeability factor&rsquo;)<span class="superscript1"><span style='font-size:8.0pt'>45,46</span></span> debido a   su propiedad de inducir aumento de la permeabilidad de los lechos capilares.</p>     <p>El VEGF/VPF estimula la proliferaci&oacute;n y migraci&oacute;n de c&eacute;lulas endoteliales y   su organizaci&oacute;n tubular<span class="superscript1"><span style='font-size:8.0pt'>47</span></span> e inhibe la apoptosis de esta c&eacute;lulas, aparentemente por medio del est&iacute;mulo de   la expresi&oacute;n endotelial de una integrina llamada <em>anb3</em> (receptor para   vitronectina).<span class="superscript1"><span style='font-size:8.0pt'>48</span></span> Mediante el est&iacute;mulo de esta integrina,<span class="superscript1"><span style='font-size:8.0pt'>49</span></span> preserva la se&ntilde;al de supervivencia   generada por la adhesi&oacute;n de las c&eacute;lulas endoteliales a su matriz extracelular.   Esta reducci&oacute;n de la apoptosis complementar&iacute;a el efecto mitog&eacute;nico del VEGF y   conducir&iacute;a a una mayor viabilidad de las c&eacute;lulas endoteliales.<span class="superscript1"><span style='font-size:8.0pt'>48</span></span></p>     <p>Adem&aacute;s, el VEGF, como ya fue mencionado,<span class="superscript1"><span style='font-size:8.0pt'>45,46</span></span> regula la permeabilidad vascular,<span class="superscript1"><span style='font-size:8.0pt'>50</span></span> favoreciendo   la extravasaci&oacute;n de prote&iacute;nas y permitiendo as&iacute; la formaci&oacute;n de un gel de   fibrina apto para la migraci&oacute;n y organizaci&oacute;n de las c&eacute;lulas endoteliales.   Estimula tambi&eacute;n la expresi&oacute;n y liberaci&oacute;n de diferentes enzimas proteol&iacute;ticas   necesarias para la lisis de la membrana basal y de la matriz extracelular,<span class="superscript1"><span style='font-size:8.0pt'>47</span></span> la cual al   ser degradada va dejando el espacio necesario para ser ocupado por los nuevos   vasos.</p>     <p>Por otra parte, ciertos estudios experimentales muestran que el VEGF   favorece el crecimiento del endotelio tras una angioplastia, es decir que   acelera la reendoteliolizaci&oacute;n despu&eacute;s de una lesi&oacute;n.<span class="superscript1"><span style='font-size:8.0pt'>51,52</span></span> Esto proteger&iacute;a al vaso de la   hiperplasia intimal y del remodelamiento.<span class="superscript1"><span style='font-size:8.0pt'>53</span></span> Tambi&eacute;n, otros FC como los FGF 1 y 2   son potenciales agentes terap&eacute;uticos en la lesi&oacute;n vascular.<span class="superscript1"><span style='font-size:8.0pt'>54</span></span> Sin embargo,   algunos autores sostienen que los FGF y el VEGF promueven la hiperplasia de la   &iacute;ntima.<span class="superscript1"><span style='font-size:8.0pt'>55-57</span></span></p>     <p>Al VEGF-A puede encontrarse naturalmente en 5 diferentes isoformas que se   denominan, seg&uacute;n la cantidad total de amino&aacute;cidos de la cadena polipept&iacute;dica   considerada, VEGF 121, VEGF 145, VEGF 165,VEGF 189 y VEGF 206, y otros menos   conocidos como el VEGF 162 y VEGF 165b. Todas estas mol&eacute;culas se sintetizan a   partir de un gen &uacute;nico,<span class="superscript1"><span style='font-size:8.0pt'>58</span></span> generando las cadenas con diferentes cantidades de residuos de amino&aacute;cidos.<span class="superscript1"><span style='font-size:8.0pt'>59,60</span></span></p>     <p>Todas las isoformas del VEGF son secretorias y tienen tambi&eacute;n (excepto la   isoforma 121) alta afinidad por la heparina y el hepar&aacute;n sulfato de la matriz   extracelular. Mientras mayor es la cadena pept&iacute;dica, mayor es la afinidad de la   isoforma del VEGF por esas macromol&eacute;culas. Adem&aacute;s, todas tienen la misma   capacidad para estimular la angiog&eacute;nesis y pueden aumentar la expresi&oacute;n   (&lsquo;upregulation&rsquo;) de varias proteasas y otros mediadores involucrados en la   formaci&oacute;n de nuevos vasos sangu&iacute;neos.<span class="superscript1"><span style='font-size:8.0pt'>47,61</span></span></p>     <p>Recientemente han sido identificados 5 genes estructuralmente relacionados   con el VEGF, codificantes para factores de crecimiento que tambi&eacute;n son   espec&iacute;ficos para c&eacute;lulas endoteliales. As&iacute;, la familia del VEGF incluye a un   grupo de p&eacute;ptidos que se denominan: VEGF-A (o VEGF-1), VEGF-B (o VEGF-3),   VEGF-C (o VEGF-2), VEGF-D, VEGF-E y VEGF-F.<span class="superscript1"><span style='font-size:8.0pt'>61,79,62-65</span></span> A esta familia tambi&eacute;n   pertenece el factor de crecimiento placentario (PLGF),<span class="superscript1"><span style='font-size:8.0pt'>66</span></span> una prote&iacute;na de 149 amino&aacute;cidos que   estimula el crecimiento de las c&eacute;lulas endoteliales y posee propiedades   similares al VEGF-B.<span class="superscript1"><span style='font-size:8.0pt'>63</span></span></p>     <p>Ha sido demostrado recientemente que el VEGF-C y el VEGF-D, actuando a   trav&eacute;s del receptor VEGFR-3,<span class="superscript1"><span style='font-size: 8.0pt'>67</span></span> est&aacute;n relacionados con la neoformaci&oacute;n de vasos   linf&aacute;ticos, proceso actualmente conocido como linfangiog&eacute;nesis<span class="superscript1"><span style='font-size:8.0pt'>65,68</span></span> y que el   VEGF-B act&uacute;a sobre los receptores VEGFR-2.</p> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'><br />       <strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Las angiopoietinas</span></strong>   <o:p></o:p> </span></h4>     <p>Las angiopoietinas han tenido recientemente una particular atenci&oacute;n porque   juegan un papel importante en la angiog&eacute;nesis<span class="superscript1"><span style='font-size:8.0pt'>69,70</span></span> y en el desarrollo del sistema   cardiovascular.<span class="superscript1"><span style='font-size:8.0pt'>71</span></span> Las angiopoietinas son peque&ntilde;as glucoprote&iacute;nas que modulan el crecimiento y el   remodelamiento de los vasos. Hasta el momento son conocidas la angiopoietina   (Ang-1) y la angiopoietina (Ang &ndash;2), ligadas espec&iacute;ficamente a los receptores tirosin-cinasa   Tie-2 (expresados en el linaje de las c&eacute;lulas endoteliales).<span class="superscript1"><span style='font-size:8.0pt'>72</span></span> Existen dos   tipos de receptores descriptos para la angiopoietinas (Tie -1 y Tie-2) que   tienen distintos papeles en la formaci&oacute;n de los vasos sangu&iacute;neos.<span class="superscript1"><span style='font-size:8.0pt'>73,74</span></span></p>     ]]></body>
<body><![CDATA[<p>La angiopoietinas 1 (agonista del receptor Tie-2), a pesar de ser un   mit&oacute;geno d&eacute;bil de endoteliocitos, induce potentemente la formaci&oacute;n de brotes   endoteliales a trav&eacute;s de la secreci&oacute;n de plasmina y de la activaci&oacute;n de   cinasas;<span class="superscript1"><span style='font-size:8.0pt'>75,76</span></span> act&uacute;a sin&eacute;rgicamente con el VEGF para inducir la angiog&eacute;nesis<span class="superscript1"><span style='font-size:8.0pt'>76,77</span></span> y juega un   papel crucial al mediar las interacciones rec&iacute;procas entre el endotelio y la   matriz extracelular.<span class="superscript1"><span style='font-size:8.0pt'>78</span></span> En contraste, la angiopoietina-2, es un factor quimiot&aacute;ctico para los   endoteliocitos<span class="superscript1"><span style='font-size:8.0pt'>79</span></span> y adem&aacute;s se considera que promueve la &laquo;maduraci&oacute;n&raquo; de la red vascular   neoformada tras el est&iacute;mulo con VEGF,<span class="superscript1"><span style='font-size:8.0pt'>80</span></span> aumentando el tama&ntilde;o del lumen   vascular y reclutando c&eacute;lulas periendoteliales (por ejemplo, pericitos).<span class="superscript1"><span style='font-size:8.0pt'>78</span></span></p>     <p>En cambio, la angiopoietina 2 es sintetizada en los sitios de remodelamiento   o regresi&oacute;n vascular y es, aparentemente, un antagonista de los receptores   Tie-2 expresados en c&eacute;lulas endoteliales.<span class="superscript1"><span style='font-size:8.0pt'>81</span></span> Tambi&eacute;n se le atribuye a la Ang-2 una   funci&oacute;n de &laquo;desestabilizaci&oacute;n&raquo; de las c&eacute;lulas endoteliales quiescentes, antes   de su proliferaci&oacute;n. Esta mol&eacute;cula actuar&iacute;a como una se&ntilde;al angiog&eacute;nica de   iniciaci&oacute;n, &laquo;abriendo&raquo; la estructura vascular para permitir la degradaci&oacute;n de   la membrana basal por parte de las proteasas y facilitando de esta manera la   acci&oacute;n de inductores angiog&eacute;nicos como el VEGF.<span class="superscript1"><span style='font-size:8.0pt'>82</span></span></p>     <p>Las respuestas celulares a las angiopoietinas tambi&eacute;n var&iacute;an dependiendo de   la presencia de VEGF en el microambiente celular.<span class="superscript1"><span style='font-size:8.0pt'>80,81</span></span> Se ha sugerido que la Ang-2 podr&iacute;a   colaborar con el VEGF en el frente de invasi&oacute;n de los brotes vasculares al   bloquear la estabilizaci&oacute;n constitutiva o la funci&oacute;n de maduraci&oacute;n promovida   por la presencia de Ang-1, permitiendo que los vasos cambien de fenotipo y   mantengan un estado m&aacute;s &laquo;pl&aacute;stico&raquo;. En este estado los vasos responder&iacute;an m&aacute;s a   las se&ntilde;ales inducidas por el VEGF.<span class="superscript1"><span style='font-size:8.0pt'>80,81</span></span></p> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'><br />   Factor de crecimiento hepatocitario       <o:p></o:p> </span></h4>     <p>Otros factores de crecimiento angiog&eacute;nicos han sido menos estudiados. Por   ejemplo, el factor de crecimiento hepatocitario (HGF), tambi&eacute;n conocido como   &lsquo;scatter factor&rsquo;(SF), es un p&eacute;ptido recientemente caracterizado que posee una   estructura heterodim&eacute;rica unida por un puente de disulfuro. Al igual que la   mayor&iacute;a de los miembros de la familia del VEGF y del FGF, tiene una gran   afinidad con el hepar&aacute;n sulfato y est&aacute; presente en numerosos grupos celulares,   entre los cuales podemos citar al endotelio y a las c&eacute;lulas musculares lisas.</p>     <p>Est&aacute; implicado en la regeneraci&oacute;n tisular, la cicatrizaci&oacute;n de las heridas y   la angiog&eacute;nesis.<span class="superscript1"><span style='font-size:8.0pt'>83</span></span> Comparte propiedades con los miembros de las familias FGF y VEGF. Como ellos, y   a diferencia de otros como el PDGF<span class="superscript1"><span style='font-size:8.0pt'>84</span></span> (factor de crecimiento derivado de las   plaquetas), es directamente angiog&eacute;nico. Como en el caso del VEGF, sus   propiedades mitog&eacute;nicas a nivel vascular se limitan al endotelio. Como el FGF,   puede inducir la expresi&oacute;n del VEGF por las c&eacute;lulas musculares lisas y actuar   sin&eacute;rgicamente con &eacute;l sobre las c&eacute;lulas endoteliales.<span class="superscript1"><span style='font-size:8.0pt'>85</span></span> Estas propiedades indican un papel   importante en la angiog&eacute;nesis y lo se&ntilde;alan como un interesante candidato para   la terap&eacute;utica vascular.</p> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'><br />       <strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Terapia proteica y         terapia g&Eacute;nica</span></strong>   <o:p></o:p> </span></h4>     <p>Los FC pueden ser administrados como prote&iacute;na recombinante (terapia   proteica) o transfiriendo los genes que los codifican insertados en vectores,   tales como pl&aacute;smidos, liposomas o por virus por otro lado (terapia g&eacute;nica).<span class="superscript1"><span style='font-size:8.0pt'>86-89</span></span></p>     <p>Los vectores pueden ser virales o no virales. Entre los primeros se destacan   los adenovirus (y muy recientemente los virus adenoasociados) por su mejor   perfil de seguridad comparado con otros vectores virales (retrovirus). Entre   los no virales los m&aacute;s usados son los pl&aacute;smidos, que son cadenas de ADN   circular bacteriano &laquo;desnudo&raquo; (no envuelto) en las que se inserta el gen   modificado del FC.</p>     <p>Ambas terapias (g&eacute;nica y proteica) promueven la angiog&eacute;nesis en territorios   isqu&eacute;micos<span class="superscript1"><span style='font-size:8.0pt'>90-93,94-98-105</span></span> y normoperfundidos,<span class="superscript1"><span style='font-size:8.0pt'>106-108</span></span> y se discute cu&aacute;l de ambas presenta el mejor balance entre ventajas y   desventajas. En la tabla 3 quisimos resaltar las diferencias entre las formas   de introducir los factores de crecimiento (terapia proteica y g&eacute;nica).</p>     <p align="center" style='text-align:center'><strong>Tabla 3</strong>. <em>Ventajas   y desventajas de las diferentes terapias (proteica y g&eacute;nica) </em></p>     <div align="center">   <table class="MsoNormalTable" border="1" cellspacing="3" cellpadding="0" width="90%"  style='width:90.0%;mso-cellspacing:2.2pt;mso-yfti-tbllook:1184;mso-padding-alt:  0cm 0cm 0cm 0cm'>     <tr style='mso-yfti-irow:0;mso-yfti-firstrow:yes'>       <td width="93" valign="top" style='width:69.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    ]]></body>
<body><![CDATA[<p><strong><span style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>&nbsp;</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="0%" valign="top" style='width:0%;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Terapia proteica</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>       <td width="0%" valign="top" style='width:0%;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><strong><span style='font-size:   10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Terapia g&eacute;nica</span></strong><span   style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>         <o:p></o:p>       </span></p></td>     </tr>     <tr style='mso-yfti-irow:1'>       <td width="93" valign="top" style='width:69.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Ventajas                 <o:p></o:p>       </span></p>               <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>&nbsp;                 <o:p></o:p>           </span></p>             <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>&nbsp;               <o:p></o:p>         </span></p></td>       <td width="0%" valign="top" style='width:0%;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'><ul type="disc">         <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:        auto;mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'><span        style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:        &quot;Times New Roman&quot;'>No introducci&oacute;n de material gen&eacute;tico ni de vectores           virales.                 <o:p></o:p>         </span></li>         <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:        auto;mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'><span        style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:        &quot;Times New Roman&quot;'>Conocimiento exacto de la dosis administrada.                 <o:p></o:p>         </span></li>         <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:        auto;mso-list:l0 level1 lfo1;tab-stops:list 36.0pt'><span        style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:        &quot;Times New Roman&quot;'>Facilidad de readministraci&oacute;n.                 <o:p></o:p>         </span></li>           </ul></td>       <td width="0%" valign="top" style='width:0%;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'><ul type="disc">         <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:        auto;mso-list:l4 level1 lfo2;tab-stops:list 36.0pt'><span        style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:        &quot;Times New Roman&quot;'>Producci&oacute;n sostenida del factor deseado.                 <o:p></o:p>         </span></li>         <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:        auto;mso-list:l4 level1 lfo2;tab-stops:list 36.0pt'><span        style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:        &quot;Times New Roman&quot;'>Exposici&oacute;n prolongada que se logra con una sola           dosis.                 <o:p></o:p>         </span></li>           </ul></td>     </tr>     <tr style='mso-yfti-irow:2;mso-yfti-lastrow:yes'>       <td width="93" valign="top" style='width:69.75pt;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'>    <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>Desventajas                 <o:p></o:p>       </span></p>               <p align="center" style='text-align:center'><span style='font-size:10.0pt;   font-family:&quot;Arial&quot;,&quot;sans-serif&quot;'>&nbsp;                 <o:p></o:p>           </span></p></td>       <td width="0%" valign="top" style='width:0%;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'><ul type="disc">         <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:        auto;mso-list:l3 level1 lfo3;tab-stops:list 36.0pt'><span        style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:        &quot;Times New Roman&quot;'>Brev&iacute;sima vida media, eleva los costes porque hay que           administrarla continuamente.                 <o:p></o:p>         </span></li>           ]]></body>
<body><![CDATA[</ul></td>       <td width="0%" valign="top" style='width:0%;border:solid #786A19 1.0pt;   mso-border-alt:solid #786A19 .75pt;padding:0cm 0cm 0cm 0cm'><ul type="disc">         <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:        auto;mso-list:l2 level1 lfo4;tab-stops:list 36.0pt'><span        style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:        &quot;Times New Roman&quot;'>Desconocimiento de la cantidad exacta del factor de           crecimiento que se sintetizar&aacute;.           <o:p></o:p>         </span></li>         <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:        auto;mso-list:l2 level1 lfo4;tab-stops:list 36.0pt'><span        style='font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:        &quot;Times New Roman&quot;'>Relacionada con la introducci&oacute;n del material gen&eacute;tico           y viral.                 <o:p></o:p>         </span></li>           </ul></td>     </tr>   </table> </div>     <p>&nbsp;</p> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'>V&iacute;as de   administraci&Oacute;n   <o:p></o:p> </span></h4>     <p>Actualmente se desconoce cu&aacute;l es la v&iacute;a de administraci&oacute;n m&aacute;s efectiva y   segura para inducir respuestas angiog&eacute;nicas cl&iacute;nicamente relevantes en el   miocardio isqu&eacute;mico sin la presencia de efectos adversos que dificulten su   aplicaci&oacute;n cl&iacute;nica. Diversos estudios experimentales han evaluado la eficacia   de diferentes v&iacute;as de administraci&oacute;n. Las ventajas y las desventajas de estas   han sido cuidadosamente analizadas en el trabajo de <em>Kornowsky</em> y   colaboradores.<span class="superscript1"><span style='font-size:8.0pt'>109</span></span></p>     <p>La v&iacute;a de administraci&oacute;n intravascular ha sido estudiada experimentalmente   en sus variantes intraarterial (mediante cat&eacute;teres intracoronarios<span class="superscript1"><span style='font-size:8.0pt'>96-98</span></span> o   intrafemorales<span class="superscript1"><span style='font-size:8.0pt'>90,102</span></span> o endovenoso.<span class="superscript1"><span style='font-size:8.0pt'>110</span></span> A pesar de la facilidad de administraci&oacute;n, esta v&iacute;a de administraci&oacute;n de los   factores angiog&eacute;nicos no ha logrado la eficacia deseada.</p>     <p>Las desventajas de la administraci&oacute;n endovascular son la riesgosa exposici&oacute;n   sist&eacute;mica a los factores angiog&eacute;nicos<span class="superscript1"><span style='font-size:8.0pt'>111</span></span> y el peligro de hipotensi&oacute;n (dosis   dependiente).<span class="superscript1"><span style='font-size:8.0pt'>112-115</span></span></p>     <p>La administraci&oacute;n intraperic&aacute;rdica es un procedimiento poco invasivo y   relativamente simple que ofrece la ventaja te&oacute;rica de la exposici&oacute;n prolongada   del tejido mioc&aacute;rdico a la sustancia administrada debido a la funci&oacute;n de   reserva del pericardio. Sin embargo, los resultados comunicados son   controvertidos;<span class="superscript1"><span style='font-size:8.0pt'>111,116-118</span></span> adem&aacute;s, la aplicaci&oacute;n cl&iacute;nica de esta v&iacute;a de administraci&oacute;n ser&iacute;a dificultosa y   poco pr&aacute;ctica en pacientes con antecedentes quir&uacute;rgicos cardiotor&aacute;cicos,   quienes hasta el momento son potenciales beneficiarios de esta nueva terapia.<span class="superscript1"><span style='font-size:8.0pt'>111,119</span></span></p>     <p>La v&iacute;a t&oacute;pica ha sido m&aacute;s estudiada que las anteriores. Diversos sistemas de   liberaci&oacute;n prolongada, como las c&aacute;psulas de alginato de heparina, las redes de   fibrina, los pol&iacute;meros porosos (pol&iacute;meros de etil&eacute;n-vinilacetato), los   hidrogeles, etc&eacute;tera, han sido usados para la administraci&oacute;n de prote&iacute;nas   promotoras de la angiog&eacute;nesis.<span class="superscript1"><span style='font-size: 8.0pt'>93,94,120-123</span></span> La administraci&oacute;n t&oacute;pica local ofrece la   ventaja potencial de evitar el r&aacute;pido lavado producido por el flujo   endovascular,<span class="superscript1"><span style='font-size:8.0pt'>111</span></span> logrando una mayor permanencia del FC en el tejido mioc&aacute;rdico,<span class="superscript1"><span style='font-size:8.0pt'>124</span></span> adem&aacute;s es   menos probable la distribuci&oacute;n de grandes concentraciones de FC al resto del   organismo. Los resultados obtenidos son, en general, m&aacute;s alentadores que los   observados por las v&iacute;as endovasculares.<span class="superscript1"><span style='font-size:8.0pt'>94,98</span></span></p>     <p>La inyecci&oacute;n intramioc&aacute;rdica directa de ADN desnudo o de prote&iacute;na   recombinante parece ser la m&aacute;s aceptada<span class="superscript1"><span style='font-size:8.0pt'>,95,99,100,105,111,119,125</span></span> ya que   evitar&iacute;a el riesgo de niveles sangu&iacute;neos elevados de factores de crecimiento   que podr&iacute;an estimular la angiog&eacute;nesis dentro de las placas ateromatosas (y   secundariamente su crecimiento y ruptura), o favorecer el desarrollo de   neovasos en territorios remotos como la retina o, peor a&uacute;n, en met&aacute;stasis o   tumores ocultos.</p>     <p>La inyecci&oacute;n intramioc&aacute;rdica puede realizarse por v&iacute;a transespic&aacute;rdica<span class="superscript1"><span style='font-size:8.0pt'>95,99,100,105</span></span> o   por v&iacute;a transendoc&aacute;rdica.<span class="superscript1"><span style='font-size:8.0pt'>111,125-127</span></span> La v&iacute;a transepic&aacute;rdica, as&iacute; como la v&iacute;a t&oacute;pica, necesitan un acceso quir&uacute;rgico,   lo cual limita su utilidad pr&aacute;ctica, adem&aacute;s de dificultar el dise&ntilde;o de ensayos   cl&iacute;nicos con grupo control para el estudio de la terapia angiog&eacute;nica aislada.<span class="superscript1"><span style='font-size:8.0pt'>100,119</span></span></p>     ]]></body>
<body><![CDATA[<p>Con respecto a la v&iacute;a transendoc&aacute;rdica, el procedimiento es m&iacute;nimamente   invasivo, ya que se llega hasta la c&aacute;mara ventricular izquierda a trav&eacute;s de un   acceso endovascular arterial percut&aacute;neo<span class="superscript1"><span style='font-size:8.0pt'>128,129</span></span> pero probablemente con riesgo   menor al de la angioplastia transluminal ya que no se involucra la luz   coronaria. Tal vez esta v&iacute;a representa la alternativa m&aacute;s promisoria ya que la   administraci&oacute;n se localiza en sitios elegidos espec&iacute;ficamente por el   profesional sobre la base del estado funcional de cada regi&oacute;n del ventr&iacute;culo   izquierdo.<span class="superscript1"><span style='font-size:8.0pt'>130</span></span></p>     <p>Esto se logra con la ayuda de un moderno sistema de navegaci&oacute;n y mapeo   electromec&aacute;nico tridimensional y en tiempo real, basado en adquisiciones de   electrogramas locales (<em>NOGA</em>, <em>Biosense</em> <em>Webster</em>, <em>Johnson</em> &amp; <em>Johnson</em>).<span class="superscript1"><span style='font-size:8.0pt'>131,132</span></span> Sus ventajas son el escaso tiempo de exposici&oacute;n a los rayos X (s&oacute;lo el   necesario para ubicar el cat&eacute;ter en la c&aacute;mara ventricular izquierda),<span class="superscript1"><span style='font-size:8.0pt'>131</span></span> la utilidad   de los par&aacute;metros globales<span class="superscript1"><span style='font-size:8.0pt'>133</span></span> y regionales<span class="superscript1"><span style='font-size:8.0pt'>134</span></span> que aporta (acortamiento sist&oacute;lico local, actividad el&eacute;ctrica local, fracci&oacute;n   de eyecci&oacute;n, etc.) y la posibilidad de realizar las inyecciones   transendoc&aacute;rdicas con el mismo cat&eacute;ter que se utiliza para hacer el   diagn&oacute;stico.<span class="superscript1"><span style='font-size:8.0pt'>125,128</span></span> Este procedimiento est&aacute; contraindicado en los pacientes con v&aacute;lvulas prot&eacute;sicas   en posici&oacute;n a&oacute;rtica o con evidencia de adelgazamiento mural del ventr&iacute;culo   izquierdo o trombos intracavitarios.</p> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'><br />   De los modelos animales a los estudios cl&Iacute;nicos   <o:p></o:p> </span></h4>     <p>Si bien conceptualmente se podr&iacute;an utilizar intervenciones que interfieran   con la atenuaci&oacute;n de la respuesta angiog&eacute;nica (por ejemplo, una inhibici&oacute;n de   los factores antiangiog&eacute;nicos), la mayor&iacute;a de los trabajos se han centrado en   el uso de los FC como el VEGF y el bFGF. Los primeros estudios que demostraron   un efecto angiog&eacute;nico en animales se realizaron en 1992, ambos con bFGF: uno en   un modelo de isquemia perif&eacute;rica<span class="superscript1"><span style='font-size:8.0pt'>135</span></span> y el otro en un modelo de infarto de   miocardio.<span class="superscript1"><span style='font-size:8.0pt'>136</span></span></p>     <p>Varias series de experimentos con animales demostraron posteriormente que el   FGF-2 administrado intracoronariamente mejoraba la perfusi&oacute;n mioc&aacute;rdica y la   funci&oacute;n, e increment&oacute; el flujo colateral en el perro, tanto en la isquemia   cr&oacute;nica como en la aguda.<span class="superscript1"><span style='font-size:8.0pt'>137-139,140</span></span> Tambi&eacute;n se han observado efectos beneficiosos sobre el flujo colateral y la   funci&oacute;n ventricular izquierda en el cerdo despu&eacute;s de la administraci&oacute;n de una   &uacute;nica dosis por v&iacute;a perivascular o dentro del pericardio de FGF-2.<span class="superscript1"><span style='font-size:8.0pt'>141-143</span></span> La prote&iacute;na   FGF-1 recombinante no ha sido efectiva en el perro.<span class="superscript1"><span style='font-size:8.0pt'>144,145</span></span> La experiencia con la   transferencia g&eacute;nica del FGF es m&aacute;s limitada. Tanto la inyecci&oacute;n intramuscular   de una &uacute;nica dosis de ADN desnudo que codifica para FGF-1, como la   transferencia adenoviral intracoronaria del gen de FGF-5, han demostrado   mejorar el flujo en la extremidad posterior del conejo<span class="superscript1"><span style='font-size:8.0pt'>146</span></span> y en el miocardio porcino,<span class="superscript1"><span style='font-size:8.0pt'>147</span></span> respectivamente.</p>     <p>Resultados satisfactorios fueron confirmados por otros autores que usaron   VEGF<span class="superscript1"><span style='font-size:8.0pt'>102,104,148-156</span></span> en animales de experimentaci&oacute;n. A partir de ese momento se comenzaron a   reportar resultados que demostraban que los factores de crecimiento   (administrados por medio de terapia proteica o g&eacute;nica) inducen una densidad   mayor en los vasos capilares y/o colaterales, una mejor funci&oacute;n vasomotora   endotelial, un aumento del flujo coronario regional y una mejor funci&oacute;n   mioc&aacute;rdica.<span class="superscript1"><span style='font-size:8.0pt'>105,157</span></span> Recientemente tambi&eacute;n se ha comprobado la eficacia productiva del SF/HGF.<span class="superscript1"><span style='font-size:8.0pt'>83</span></span></p>     <p>Los resultados obtenidos en animales experimentales indujeron a muchos   investigadores a proponer ensayos en fase I, centr&aacute;ndose inicialmente en la   patolog&iacute;a vascular perif&eacute;rica. En 1994, <em>Isner</em><span class="superscript1"><span style='font-size:8.0pt'>90</span></span> inici&oacute; ensayos cl&iacute;nicos en pacientes   con arteriopat&iacute;a perif&eacute;rica aplicando ADN &laquo;desnudo&raquo; mediante un bal&oacute;n de   angioplastia en dosis crecientes para su transferencia a la pared vascular.   Comprob&oacute; al a&ntilde;o un aumento del flujo, disminuci&oacute;n del dolor de reposo y   evidencia objetiva de formaci&oacute;n vascular histol&oacute;gica y angiogr&aacute;fica. El mismo   grupo de investigadores obtuvo resultados favorables en 1998 utilizando esta   vez la v&iacute;a intramuscular.<span class="superscript1"><span style='font-size:8.0pt'>91</span></span> Si bien en ambas instancias no hubo grupo control, las conclusiones iniciales   de estos y otros trabajos fueron muy alentadores.</p>     <p>Pero el inter&eacute;s de los investigadores no se restringi&oacute; al empleo de los FC   en la isquemia arterial perif&eacute;rica.<span class="superscript1"><span style='font-size:8.0pt'>158</span></span> En febrero de 1998, <em>Schumacher</em><span class="superscript1"><span style='font-size:8.0pt'>159</span></span> public&oacute; la   primera terap&eacute;utica angiog&eacute;nica en la cardiopat&iacute;a isqu&eacute;mica humana: en un   estudio aleatorizado de 20 pacientes sometidos a cirug&iacute;a coronaria, se inyect&oacute;   FGF en el miocardio vecino a la arteria descendente anterior. A las 12 semanas   se comprob&oacute; (por angiograf&iacute;a de sustracci&oacute;n digital) la existencia de una   neovascularizaci&oacute;n en el &aacute;rea mioc&aacute;rdica inyectada en los casos estudiados pero   no en los controles. Actualmente, a casi tres a&ntilde;os de seguimiento, la mejor&iacute;a   cl&iacute;nica, angiogr&aacute;fica y ecocardiogr&aacute;fica sigue manifest&aacute;ndose.<span class="superscript1"><span style='font-size:8.0pt'>95</span></span></p>     <p>Existen estudios cl&iacute;nicos con abordaje quir&uacute;rgico publicados, adem&aacute;s del   citado, como el de <em>Rosengart</em> (quien inyect&oacute; intramioc&aacute;rdicamente   adenovirus codificante para VEGF 121),<span class="superscript1"><span style='font-size:8.0pt'>99</span></span> el de <em>Laham</em> (quien administr&oacute;   de forma t&oacute;pica el bFGF recombinante de liberaci&oacute;n prolongada)<span class="superscript1"><span style='font-size:8.0pt'>94</span></span> y el <em>Symes</em> (quien inyect&oacute; intramioc&aacute;rdicamente un pl&aacute;smido de VEGF165).<span class="superscript1"><span style='font-size:8.0pt'>100</span></span> En todos   ellos los resultados fueron favorables, aunque con escaso n&uacute;mero de pacientes.</p>     <p>Adem&aacute;s como an&aacute;lisis debemos tener en cuenta que en tres de ellos hubo   cirug&iacute;a de derivaci&oacute;n asociada<span class="superscript1"><span style='font-size: 8.0pt'>94,95,99</span></span> y en los dos en los que se realiz&oacute; terapia g&eacute;nica   no hubo grupo control.<span class="superscript1"><span style='font-size:8.0pt'>99,100</span></span></p>     <p>Existen diferentes trabajos cl&iacute;nicos que han utilizado la v&iacute;a de   administraci&oacute;n intracoronaria, entre ellos tenemos el de <em>Hendel</em> (VEGF   recombinante)<span class="superscript1"><span style='font-size:8.0pt'>97</span></span> y el de <em>Udelson</em> (bFGF recombinante).<span class="superscript1"><span style='font-size:8.0pt'>96</span></span> El primero es la extensi&oacute;n de las   comunicaciones iniciales de <em>Henry</em><span class="superscript1"><span style='font-size:8.0pt'>115,160</span></span> precursores del <em>VIVA Trial</em> (&lsquo;VEGF in Ischemia for Vascular Angiogenesis&rsquo;), y que involucra a 178   pacientes. En la comunicaci&oacute;n de este ensayo,<span class="superscript1"><span style='font-size:8.0pt'>98</span></span> difundida en las Sesiones Cient&iacute;ficas   2000 de la American Heart Association, el seguimiento a un a&ntilde;o no muestra   diferencias significativas entre los grupos tratados y el grupo placebo,   mientras el estudio de <em>Udelson</em><span class="superscript1"><span style='font-size:8.0pt'>96</span></span> muestra una discreta mejor&iacute;a en la   perfusi&oacute;n de reposo y ejercicio en 45 pacientes a los 180 d&iacute;as de seguimiento.</p>     ]]></body>
<body><![CDATA[<p>Existen otros trabajos en la literatura internacional como el de <em>Losordo,</em><span class="superscript1"><span style='font-size:8.0pt'>161</span></span> quien aplic&oacute;   el VEGF-165 a 5 pacientes a trav&eacute;s de una minitoracotom&iacute;a sin realizar   revascularizaci&oacute;n y a quien se le se&ntilde;al&oacute; que fueron pocos pacientes y no hubo   grupo control. Por otro lado, en el estudio de <em>Symes</em><span class="superscript1"><span style='font-size:8.0pt'>100</span></span> se quiso   probar cual era la mejor dosis de aplicaci&oacute;n del VEGF, para lo cual se   escogieron 20 pacientes, a 10 de los cuales se les aplic&oacute; 250&nbsp;ng y a los   10 restantes 125&nbsp;ng del producto, y se observ&oacute; mayor efectividad en el   grupo al que se aplic&oacute; 250&nbsp;ng.</p>     <p><em>Vale</em><span class="superscript1"><span style='font-size:8.0pt'>129</span></span> demostr&oacute; la eficacia del sistema <em>Noga</em> en la aplicaci&oacute;n del factor (v&iacute;a   endoc&aacute;rdica), mientras que en el estudio de <em>Fortuin</em><span class="superscript1"><span style='font-size:8.0pt'>162</span></span> y <em>Reilly</em><span class="superscript1"><span style='font-size:8.0pt'>163</span></span> se valor&oacute; el   uso del VEGF-2 como factor de crecimiento angiog&eacute;nico, con buenos resultados.   Por otra parte <em>Hedman</em><span class="superscript1"><span style='font-size: 8.0pt'>164</span></span> quiso realizar un trabajo comparativo inyectando   intracoronariamente en 37 pacientes VEGF usando adenovirus y en 28 us&oacute; un   pl&aacute;smido, tambi&eacute;n escogi&oacute; un grupo control y concluy&oacute; que a los pacientes a los   que se les inyect&oacute; el factor ten&iacute;an mejor perfusi&oacute;n que en el grupo control. </p>     <p>En otro trabajo<span class="superscript1"><span style='font-size:8.0pt'>165</span></span> se utiliz&oacute; la v&iacute;a intracoronaria para la aplicaci&oacute;n del factor, tras   seleccionar 2 grupos a los que se les inyectaron diferentes dosis de VEGF y se   escogi&oacute; un grupo control (placebo). Se concluy&oacute; que cuando se inyectaba una dosis   superior de VEGF la mejor&iacute;a cl&iacute;nica era superior. Sin embargo, en el estudio de <em>Kastrup,</em><span class="superscript1"><span style='font-size:8.0pt'>166</span></span> que tuvo un esquema parecido, no se evidenci&oacute; mejor&iacute;a cl&iacute;nica pero si se   evidenci&oacute; mejor&iacute;a en la fracci&oacute;n de eyecci&oacute;n en el grupo que se inyect&oacute; el   VEGF.</p> <h4><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'>&nbsp;       <o:p></o:p> </span></h4> <h4><strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family: &quot;Times New Roman&quot;'>Complicaciones de la terapia angiog&Eacute;nica</span></strong><span style='mso-fareast-font-family:&quot;Times New Roman&quot;'>   <o:p></o:p> </span></h4>     <p>Es importante mencionar el riesgo a&uacute;n no demostrado en ninguno de los   trabajos cl&iacute;nicos publicados hasta ahora<span class="superscript1"><span style='font-size:8.0pt'>90-100</span></span> de angiog&eacute;nesis patol&oacute;gica.<span class="superscript1"><span style='font-size:8.0pt'>167</span></span></p>     <p>El VEGF juega un papel en desarrollo de la neovascularizaci&oacute;n intraocular,   como la retinopat&iacute;a diab&eacute;tica.<span class="superscript1"><span style='font-size: 8.0pt'>168,169</span></span> Es cierto que la presencia de esta patolog&iacute;a es   criterio de exclusi&oacute;n en estudios de angiog&eacute;nesis, pero es improbable que la   neovascularizaci&oacute;n pueda ocurrir en una retinopat&iacute;a no isqu&eacute;mica.</p>     <p>Otro potencial efecto adverso es la estimulaci&oacute;n del desarrollo tumoral. Se   ha establecido como criterio de exclusi&oacute;n en la mayor&iacute;a de los estudios   cl&iacute;nicos a los pacientes con tumores malignos conocidos, porque existir&iacute;a,   te&oacute;ricamente, la posibilidad de que los FC estimulen el crecimiento de tumores   no diagnosticados.<span class="superscript1"><span style='font-size:8.0pt'>170,171</span></span> Se ha evidenciado en trabajos de experimentaci&oacute;n la participaci&oacute;n de los FC en   la angiog&eacute;nesis tumoral,<span class="superscript1"><span style='font-size:8.0pt'>172,173</span></span> adem&aacute;s de que por otro lado se llevan a cabo diversas investigaciones para   comprobar los efectos antitumorales de los inhibidores de la angiog&eacute;nesis.<span class="superscript1"><span style='font-size:8.0pt'>174,175</span></span> No   obstante a lo planteado, ciertos trabajos demuestran la falta del potencial   oncog&eacute;nico de ciertos FC.<span class="superscript1"><span style='font-size:8.0pt'>176,177</span></span> Lo cierto es que por el momento no existen evidencias cl&iacute;nicas concretas al   respecto.</p>     <p>Otra observaci&oacute;n importante radica en la neovascularizaci&oacute;n de las placas   ateroscler&oacute;ticas<span class="superscript1"><span style='font-size:8.0pt'>178-183</span></span> que podr&iacute;an causar su inestabilidad<span class="superscript1"><span style='font-size:8.0pt'>184</span></span> y ruptura.<span class="superscript1"><span style='font-size:8.0pt'>185,186</span></span> Esto no se ha observado   concluyentemente durante el seguimiento de los pacientes tratados con   angi&oacute;genesis. De hecho el resultado es m&aacute;s bien el opuesto, ya que la   administraci&oacute;n de VEGF ha producido una reducci&oacute;n estad&iacute;sticamente   significativa en el engrosamiento de la &iacute;ntima debido a una reendotelizaci&oacute;n   acelerada, lo que va en contra del concepto de que la aceleraci&oacute;n de la   aterosclerosis es una consecuencia de la estimulaci&oacute;n de la angiog&eacute;nesis   inducida por VEGF.</p>     <p>Se ha descrito que el tratamiento con prote&iacute;nas recombinantes produce   hipotensi&oacute;n,<span class="superscript1"><span style='font-size:8.0pt'>112,115,149</span></span> particularmente cuando se administra por v&iacute;a sist&eacute;mica y a altas dosis, debido   a que el VEGF estimula la s&iacute;ntesis de &oacute;xido n&iacute;trico.<span class="superscript1"><span style='font-size:8.0pt'>187,188</span></span> Sin embargo, esta complicaci&oacute;n   nunca ha sido descrita despu&eacute;s de realizarse transferencia g&eacute;nica ni en   animales ni en seres humanos. </p>     <p>Se han se&ntilde;alado tambi&eacute;n casos de edema secundario al aumento de   permeabilidad capilar,<span class="superscript1"><span style='font-size:8.0pt'>91</span></span> as&iacute; como anemia, trombocitopenia, nefropat&iacute;a membranosa y proteinuria.<span class="superscript1"><span style='font-size:8.0pt'>189-191</span></span></p> <h6><strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family: &quot;Times New Roman&quot;'>Conclusiones</span></strong><span style='mso-fareast-font-family: &quot;Times New Roman&quot;'>   <o:p></o:p> </span></h6>     <p>Los resultados iniciales de la angiog&eacute;nesis terap&eacute;utica en la cardiopat&iacute;a   isqu&eacute;mica humana han sido alentadores pero no concluyentes, debido a la escasez   de pacientes estudiados, a lo limitado del seguimiento y a la pobreza de casos   control, por lo que todav&iacute;a quedan muchas preguntas por contestar. No sabemos   cu&aacute;l factor de crecimiento proporciona la mejor respuesta angiog&eacute;nica, no   conocemos espec&iacute;ficamente el efecto sin&eacute;rgico entre el bFGF y el VEGF, que se   ha demostrado tanto <em>in vitro </em>como en modelos animales, cu&aacute;l ser&iacute;a la   mejor terapia (proteica o g&eacute;nica), cu&aacute;les las dosis ideales y la frecuencia de   administraci&oacute;n, entre otras preguntas.</p>     ]]></body>
<body><![CDATA[<p>Desconocemos a&uacute;n, por otro lado, el perfil de seguridad a largo plazo y la   duraci&oacute;n del efecto terap&eacute;utico. Finalmente cuando se planifican los estudios   cl&iacute;nicos controlados se deber&iacute;an establecer cu&aacute;les son los criterios de   valoraci&oacute;n ('end-points') &oacute;ptimos para estimar los efectos terap&eacute;uticos. Al   igual que en los estudios comparativos entre cirug&iacute;a coronaria y angioplastia,   &iquest;se deber&iacute;a considerar como criterios a la muerte y al infarto? o simplemente   &iquest;ser&iacute;an suficientes los indicadores de calidad de vida, clase cl&iacute;nica de la   angina o las pruebas ergom&eacute;tricas para justificar el uso de esta nueva   terapia?. Nosotros pensamos que en un tema como &eacute;ste, deber&iacute;an priorizarse   siempre los criterios objetivos y cuantificables (SPECT, eco-estr&eacute;s, RMN) antes   que los subjetivos (clase funcional, consumo de nitritos, calidad de vida) que   est&aacute;n influidos tan intensamente por el &laquo;efecto placebo&raquo;.<span class="superscript1"><span style='font-size:8.0pt'>192</span></span> S&oacute;lo cuando   tengamos las respuestas a algunas de estas preguntas podremos extraer   conclusiones m&aacute;s confiables acerca de la utilidad de la angiog&eacute;nesis   terap&eacute;utica para mejorar la cantidad y calidad de vida de los pacientes que   sufren una cardiopat&iacute;a isqu&eacute;mica. </p>     <p>Sin duda pensamos que estamos dando los primeros pasos en un camino largo,   apasionante y muy prometedor para el tratamiento de la cardiopat&iacute;a isqu&eacute;mica,   como lo expresa <em>Selke</em><span class="superscript1"><span style='font-size: 8.0pt'>193</span></span> en su trabajo.</p>     <p>&nbsp;</p> <hr /> <h4><strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;; mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language:EN-US' lang="EN-US" xml:lang="EN-US">&nbsp;</span></strong><span style='mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language: EN-US' lang="EN-US" xml:lang="EN-US">summary       <o:p></o:p> </span></h4>     <p><span style='mso-ansi-language:EN-US' lang="EN-US" xml:lang="EN-US">The history of the use of   growth factors and the concepts of angiogenesis, arteriogenesis and   vasculogenesis were presented in this paper. The different growth factors that   are known so far were stated, making emphasis on the most used (vascular   endothelial and fibroblast growth factors). The various ways of application and   of administration proteic or genic) were analyzed. An account of several   preclinical and clinical studies using these growth factors for ischemic   cardiopathy treatment were made. The various studies contributed information on   the possible complications of the use of these factors; conclusions were drawn   and recommendations were made.       <o:p></o:p> </span></p>     <p><em><span style='mso-ansi-language:EN-US' lang="EN-US" xml:lang="EN-US">Key words:</span></em><span style='mso-ansi-language:EN-US' lang="EN-US" xml:lang="EN-US"> growth factors, angiogenesis,   vascular endothelial growth factor.       <o:p></o:p> </span></p> <hr />     <p>&nbsp;</p>     <p><strong><span style='font-family:&quot;Arial&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:     &quot;Times New Roman&quot;'>REFERENCIAS BIBLIOGR&Aacute;FICAS</span></strong><span     style='mso-fareast-font-family:&quot;Times New Roman&quot;'>       <o:p></o:p>     ]]></body>
<body><![CDATA[</span></p>     <ol start="1" type="1">       <li class="MsoNormal" style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;          mso-list:l1 level1 lfo5;tab-stops:list 36.0pt'><span          style='mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language:EN-US' lang="EN-US" xml:lang="EN-US">Hockel         M, Schlenger K, Doctrow S. Therapeutic angiogenesis. </span><span          style='mso-fareast-font-family:&quot;Times New Roman&quot;'>Arch Surg           1993;128:423-429.           <o:p></o:p>         </span></li>     ]]></body>
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<body><![CDATA[<p>&nbsp;</p>     <p>Recibido: 23 de marzo de 2007. Aprobado: 16 de mayo de 2007.<br />     <em>Dr. Alejandro Villar Incl&aacute;n</em>. Calle Padre Varela y San L&aacute;zaro, Centro   Habana. La Habana, Cuba.<br />   Correo electr&oacute;nico: <a href="mailto:alejandro.villar@infomed.sld.cu"><b><span style='font-size:8.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;'>alejandro.villar@infomed.sld.cu</span></b></a> </p>     <p><br />     <a href="#autor"><b><span style='font-size:8.0pt;font-family:&quot;Verdana&quot;,&quot;sans-serif&quot;'>1       Especialista de I Grado en Cirug&iacute;a Cardiovascular y Cirug&iacute;a General. Profesor       Instructor de Cirug&iacute;a Cardiovascular.</span></b></a><a name="cargo" id="cargo"></a></p>      ]]></body><back>
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