<?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>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402006000600036</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[De la hipótesis de la trombina a la inflamación: ¿Es una realidad?]]></article-title>
<article-title xml:lang="en"><![CDATA[From thrombin hypothesis to inflammation: It is reality?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Pacheco]]></surname>
<given-names><![CDATA[Héctor]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología Unidad de Cuidados Coronarios ]]></institution>
<addr-line><![CDATA[México D.F]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2006</year>
</pub-date>
<volume>76</volume>
<fpage>233</fpage>
<lpage>238</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402006000600036&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402006000600036&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402006000600036&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La ruptura de la placa aterosclerótica y la subsecuente trombosis intracoronaria son los mecanismos responsables para el desarrollo de los síndromes coronarios agudos. Se ha considerado que la inflamación juega un papel importante en la inestabilidad de la placa y que la trombogenicidad está dada por la generación de factor tisular (FT) existiendo interrelación entre estos dos sistemas. El FT modula la generación de trombina que no únicamente participa en la hemostasia y trombosis si no también promueve el proceso inflamatorio a través de los receptores activados de proteasas (PARs) provocando un ciclo vicioso entre la inflamación y coagulación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The classical pathophysiologic concept of the acute coronary syndromes is the coronary artery thrombosis as a consequence of rupture or vulnerable atherosclerotic plaques. Actually, it is also been considered that systemic inflammatory phenomenon play a central role in the plaque instability associated to the atherothrombotic activity of the tissue factor (TF). The throm-botic phenomenon is controlled by tissue factor, stimulating the way of the protease's active receptors (PAR) and cause a negative cycle between inflammation and coagulation.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Síndrome coronario agudo]]></kwd>
<kwd lng="es"><![CDATA[Inflamación]]></kwd>
<kwd lng="es"><![CDATA[Trombina]]></kwd>
<kwd lng="en"><![CDATA[Acute coronary syndrome]]></kwd>
<kwd lng="en"><![CDATA[Inflammation]]></kwd>
<kwd lng="en"><![CDATA[Thrombin]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Presentaci&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b><i>De la hip&oacute;tesis de la trombina a la inflamaci&oacute;n. &iquest;Es una realidad?</i></b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>From thrombin hypothesis to inflammation. It is reality?</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>H&eacute;ctor Gonz&aacute;lez Pacheco*</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Unidad de Cuidados Coronarios. Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Correspondencia: </b>    <br>     <i>Dr. H&eacute;ctor Gonz&aacute;lez Pacheco.    <br>     Unidad de Cuidados Coronarios. Instituto Nacional de Cardiolog&iacute;a, Ignacio Ch&aacute;vez.    <br>     (INCICH, Juan Badiano N&uacute;m. 1. Col. Secci&oacute;n XVI, Tlalpan 14080. M&eacute;xico, D.F).</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2">La ruptura de la placa ateroscler&oacute;tica y la subsecuente trombosis intracoronaria son los mecanismos responsables para el desarrollo de los s&iacute;ndromes coronarios agudos. Se ha considerado que la inflamaci&oacute;n juega un papel importante en la inestabilidad de la placa y que la trombogenicidad est&aacute; dada por la generaci&oacute;n de factor tisular (FT) existiendo interrelaci&oacute;n entre estos dos sistemas. El FT modula la generaci&oacute;n de trombina que no &uacute;nicamente participa en la hemostasia y trombosis si no tambi&eacute;n promueve el proceso inflamatorio a trav&eacute;s de los receptores activados de proteasas (PARs) provocando un ciclo vicioso entre la inflamaci&oacute;n y coagulaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>S&iacute;ndrome coronario agudo. Inflamaci&oacute;n. Trombina.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Summary</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">The classical pathophysiologic concept of the acute coronary syndromes is the coronary artery thrombosis as a consequence of rupture or vulnerable atherosclerotic plaques. Actually, it is also been considered that systemic inflammatory phenomenon play a central role in the plaque instability associated to the atherothrombotic activity of the tissue factor (TF). The throm&#150;botic phenomenon is controlled by tissue factor, stimulating the way of the protease's active receptors (PAR) and cause a negative cycle between inflammation and coagulation.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Key words: </b>Acute coronary syndrome. Inflammation. Thrombin.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Los avances importantes en el conocimiento de la fisiopatolog&iacute;a de la aterotrombosis (ATT), se han llevado a cabo en las 2 &uacute;ltimas d&eacute;cadas. A la hip&oacute;tesis del acumulo de l&iacute;pidos en su fisiopatolog&iacute;a, se han integrado varios factores que contribuyen al inicio y a la evoluci&oacute;n de la aterotrombosis. La inflamaci&oacute;n y la apoptosis de varias l&iacute;neas celulares participan en forma predominante en el inicio y progresi&oacute;n de la enfermedad ATT y se ha postulado que el factor tisular es el responsable de la trombogenicidad de la placa ateroscler&oacute;tica. </font></p>     <p align="justify"><font face="verdana" size="2">La inflamaci&oacute;n y la coagulaci&oacute;n tienen un papel importante en la fisiopatolog&iacute;a de las enfermedades vasculares. Hay numerosas evidencias en las que se puntualiza la interrelaci&oacute;n de los dos sistemas, en donde la inflamaci&oacute;n no s&oacute;lo activa a la coagulaci&oacute;n, sino que la coagulaci&oacute;n tambi&eacute;n tiene importantes efectos inflamatorios. Tanto una exagerada o insuficiente respuesta puede conducir a una situaci&oacute;n en la que la coagulaci&oacute;n y la trombosis contribuyan a la enfermedad, como sucede en la trombosis intracoronaria sobre una placa de aterosclerosis rota <i>(<a href="#f1">Fig. 1</a>).</i></font></p>     <p align="center"><font face="verdana" size="2"><i><a name="f1"></a></i></font></p>     <p align="center"><font face="verdana" size="2"><i><img src="/img/revistas/acm/v76s2/a36f1.jpg"></i></font></p>     <p align="justify"><font face="verdana" size="2">La ruptura de una placa y la subsecuente formaci&oacute;n de un trombo es responsable para el inicio de muchos s&iacute;ndromes isqu&eacute;micos coronarios agudos (SICA). La magnitud de este proceso tromb&oacute;tico es modulado por diferentes elementos que participan tanto a nivel de la placa como en la trombogenicidad de la sangre. Se ha considerado que la composici&oacute;n y el estado de la placa m&aacute;s que el grado de estenosis, es el principal determinante de la enfermedad ATT.<sup>1,2</sup> Estas placas llamadas vulnerables o de alto riesgo propensas a romperse o inestabilizarse consistente de grandes "core" lip&iacute;dico extracelular, un gran infiltrado inflamatorio predominantemente de macr&oacute;fagos, un reducido n&uacute;mero de c&eacute;lulas de m&uacute;sculo liso y una capa fibrosa delgada. Una vez que la ruptura de la placa ocurre, el core lip&iacute;dico altamente trombog&eacute;nico por un elevado contenido de factor tisular (FT), es expuesto al torrente sangu&iacute;neo provocando la formaci&oacute;n del trombo intracoronario.<sup>3&#150;6</sup>. </font></p>     <p align="justify"><font face="verdana" size="2">El iniciador principal en la generaci&oacute;n de trombina inducida por la inflamaci&oacute;n es modulada por el FT, el cual es considerado el principal regulador de la hemostasia y de la trombosis <i>(<a href="#f2">Fig. 2</a>). </i>El bloqueo de la actividad del FT completamente detiene la activaci&oacute;n de la coagulaci&oacute;n inducida por la inflamaci&oacute;n como se ha demostrado en modelos experimentales de endotoxemia o bacteremia, en donde los anticuerpos que inhiben el sistema de contacto no afecta la formaci&oacute;n de trombina.<sup>7,8</sup> El FT es una prote&iacute;na transmembrana que es expresada en varias l&iacute;neas celulares del organismo.<sup>9</sup> El origen del FT puede ser de diferentes fuentes en situaciones de inflamaci&oacute;n. En las placas ateroscler&oacute;ticas, es generado en gran parte por macr&oacute;fagos y es activado al entrar en contacto con c&eacute;lulas apoptoicas principalmente de origen endotelial. La mayor&iacute;a del FT expresado dentro de la placa de ateroma ha sido en &aacute;reas de alta densidad de c&eacute;lulas apoptoicas y de micropart&iacute;culas,<sup>10</sup> &eacute;stas tienen actividad procoagulante por su alto contenido de fosfatidilserina, hace suponer la importancia del FT en la formaci&oacute;n del trombo y que puede ser un nuevo objetivo en el tratamiento farmacol&oacute;gico <i>(<a href="#f3">Fig. 3</a>). </i></font></p>     <p align="center"><font face="verdana" size="2"><i><a name="f2"></a></i></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><i><img src="/img/revistas/acm/v76s2/a36f2.jpg"></i></font></p>     <p align="center"><font face="verdana" size="2"><i><a name="f3"></a></i></font></p>     <p align="center"><font face="verdana" size="2"><i><img src="/img/revistas/acm/v76s2/a36f3.jpg"></i></font></p>     <p align="justify"><font face="verdana" size="2">La apoptosis dentro del ateroma compromete a todas las l&iacute;nea celulares.<sup>11</sup> A pesar de la iniciaci&oacute;n de la muerte celular, las c&eacute;lulas apoptoicas est&aacute;n relacionadas con la inflamaci&oacute;n por favorecer el reclutamiento de otras c&eacute;lulas inflamatorias.<sup>12</sup> Mallat y cols.<sup>13</sup> han demostrado la asociaci&oacute;n entre la apoptosis y la inflamaci&oacute;n, coexistiendo los dos procesos en &aacute;reas de ruptura de la placa.<sup>13</sup> Ellos mismos han encontrado niveles elevados de micropart&iacute;culas de membrana de c&eacute;lulas apoptoicas en la placa ateroscler&oacute;tica<sup>14</sup> as&iacute; mismo mostraron niveles elevados de micropart&iacute;culas de membrana con potencial procoagulante en la sangre perif&eacute;rica. En resumen el fen&oacute;meno apoptoico es fuertemente asociado con la producci&oacute;n de FT activado que al final conduce a la formaci&oacute;n de trombina. </font></p>     <p align="justify"><font face="verdana" size="2">La generaci&oacute;n de trombina se hace a ra&iacute;z de la actividad de FT, es conocido que la trombina es crucial en la enfermedad ATT; es la principal proteasa efectora de la cascada de coagulaci&oacute;n y se considera que una reacci&oacute;n importante es la conversi&oacute;n de fibrin&oacute;geno a fibrina, adem&aacute;s de la activaci&oacute;n de cofactores esenciales de la coagulaci&oacute;n como son el V, VIII y del factor XI, provocando mayor cantidad de factores IXa y Xa, y por otra parte se ha considerado a la trombina como el principal agonista de la activaci&oacute;n plaquetaria. Tambi&eacute;n provoca una respuesta al endotelio vascular, como son cambios de forma y permeabilidad, moviliza mol&eacute;culas de adhesi&oacute;n a la superficie endotelial y estimula la producci&oacute;n de cito quinas y de sustancias autocoides tales como prostaglandinas y factor de activaci&oacute;n plaquetaria <i>(<a href="#f4">Fig. 4</a>). </i>Sin embargo, la trombina como otras prote&iacute;nas anticoagulantes como es la prote&iacute;na C activada, puede activar receptores espec&iacute;ficos sobre c&eacute;lulas mononucleares y endoteliales, promoviendo la producci&oacute;n de citoquinas o la propia apoptosis de c&eacute;lulas inflamatorias.<sup>15</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v76s2/a36f4.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">El mecanismo m&aacute;s importante por la cual estas proteasas de la coagulaci&oacute;n influyen en la inflamaci&oacute;n es a trav&eacute;s de la uni&oacute;n con los receptores activados de proteasas (PARs), de los cuales se han identificado 4 tipos (PAR 1 al 4), todos son de la familia de receptores acoplados a la prote&iacute;na G transmembrana<sup>16</sup> y se han identificado en c&eacute;lulas endoteliales, c&eacute;lulas mononucleares, plaquetas, fibroblastos y c&eacute;lulas de m&uacute;sculo liso.<sup>17 </sup>Los PAR 1, 3 y 4 son receptores de trombina, donde el PAR 2, no une a la trombina pero s&iacute; al complejo factor tisular &#150; VIIa, factor Xa y tripsina <i>(<a href="#f5">Fig. 5</a>).</i></font></p>     <p align="center"><font face="verdana" size="2"><i><a name="f5"></a></i></font></p>     <p align="center"><font face="verdana" size="2"><i><img src="/img/revistas/acm/v76s2/a36f5.jpg"></i></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Se conoce la participaci&oacute;n de los PARs en la coagulaci&oacute;n e inflamaci&oacute;n en la trombosis intracoronaria, ratones con deficiencia de PAR&#150;4, muestran <i>in vivo </i>una ausencia de actividad plaquetaria y son protegidos contra trombosis arterial experimental,<sup>18</sup> otros efectos que se han demostrado de PAR&#150;1 y PAR&#150;4 es su participaci&oacute;n en la hipertrofia de los miocitos y sobre la remodelaci&oacute;n card&iacute;aca en la isquemia.<sup>19</sup></font></p>     <p align="justify"><font face="verdana" size="2">El conocimiento de los mecanismos moleculares en la enfermedad ATT ha sido trascendente en el desarrollo de terapias antitromb&oacute;ticas &oacute;ptimas. El manejo con inhibidores de la trombina como son la heparina no fraccionada (HNF) y actualmente las heparinas de bajo peso molecular (HBPM) han sido la piedra angular en el tratamiento de la enfermedad ATT. </font></p>     <p align="justify"><font face="verdana" size="2">Se ha establecido que la enoxaparina (HBPM) ejerce su efecto antitromb&oacute;tico principalmente por la inhibici&oacute;n del factor Xa, pero tambi&eacute;n se ha demostrado que su administraci&oacute;n inhibe la generaci&oacute;n y la actividad de FVIIa y de la protrombina, independiente de la liberaci&oacute;n del inhibidor de v&iacute;a del factor tisular (TFPI), lo que significa que la enoxaparina disminuye la generaci&oacute;n y actividad de trombina.<sup>20</sup> Resultados que se correlacionan con el reporte de Keating y cols.<sup>21</sup> quienes demuestran que la administraci&oacute;n de un inhibidor directo de la trombina (bivalirudina) tiene un efecto m&aacute;s consistente sobre los marcadores de inflamaci&oacute;n, disminuyendo su concentraci&oacute;n, lo que puede contribuir a una mejor evoluci&oacute;n.<sup>21</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusiones</b></font></p>     <p align="justify"><font face="verdana" size="2">La trombosis intracoronaria que sucede despu&eacute;s de la ruptura de una placa ateroscler&oacute;tica es el evento m&aacute;s importante para el inicio de un evento coronario agudo. El FT es principal determinante de la trombogenicidad de la placa inestable; as&iacute; como de la sangre circulante en enfermos ATT, y que este es el factor determinante en la generaci&oacute;n de trombina, que no &uacute;nicamente act&uacute;a sobre la cascada de coagulaci&oacute;n, sino que participa promoviendo la inflamaci&oacute;n, creando un ciclo vicioso entre inflamaci&oacute;n y coagulaci&oacute;n. Esta interrelaci&oacute;n nos ofrece un campo de investigaci&oacute;n para nuevas terapias que puedan modificar la excesiva activaci&oacute;n de estos dos sistemas.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b></font></p>     <!-- ref --><p align="justify"><font face="verdana" size="2">1. 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