<?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>S1405-99402006000800006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Remodelación cardíaca e inflamación]]></article-title>
<article-title xml:lang="en"><![CDATA[Cardiac remodeling and inflammation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Rosas]]></surname>
<given-names><![CDATA[Martín]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Departamento de Fisiología ]]></institution>
<addr-line><![CDATA[México, D.F. ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2006</year>
</pub-date>
<volume>76</volume>
<fpage>58</fpage>
<lpage>66</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402006000800006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402006000800006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402006000800006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La remodelación cardíaca es una respuesta progresiva del corazón al daño agudo y crónico sin importar su etiología. Este proceso es caracterizado por cambios en el tamaño, en la forma y en la función del corazón y está asociado a un mal pronóstico en pacientes con insuficiencia cardíaca. El infarto agudo del miocardio es la causa más común del proceso de remodelado. En los primeros minutos posteriores al daño en la zona isquémica existe un importante aumento en la síntesis y liberación de citocinas proin-flamatorias como el factor de necrosis tumoral-alfa (TNF-&#945;) la interleucina-6 (IL-6), la interleucina-1-beta (IL-1&#946;) y el factor de crecimiento transformante-1-beta (TGF-1&#946;). Esta liberación aguda de citocinas podría regular la sobrevivencia o el proceso de apoptosis de los miocitos en la zona infartada y, sus efectos inotrópicos negativos pudieran representar una respuesta adaptativa para delimitar el daño y para disminuir la demanda de energía del miocardio. Esta significativa regulación a la alta de las citocinas proinflamatorias puede extenderse a la zona no infartada y disparar una segunda fase de niveles elevados de citocinas que promueven la fibrosis intersticial y la deposición de colágena en el miocardio no infartado contralateral llevando a un ventrículo disfuncional. Este artículo revisa los reportes recientes que apoyan la idea de un papel cardioprotector para esta respuesta inflamatoria primaria y un papel deletéreo a largo plazo de la respuesta tardía que media la fibrosis característica del proceso de remodelación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The cardiac remodeling is a progressive response of the heart to acute and chronic insults regardless its etiology. This process is characterized by changes in the size, shape and function and is associated with a worse prognosis in patients with heart failure. The acute myocardial infarction is the most common cause of remodeling. In the first minutes after injury in the ischemic zone there is an important augment in the synthesis and release of proinflammatory cytokines such as tumor necrosis factor-alpha (TNF-&#945;) interleukin-6 (IL-6), interleukin-1-beta (IL-1&#946;) and transforming growth factor 1-beta (TGF-1&#946;). This acute releasing of cytokines could regulate the survival or apoptosis of myocytes in infarcted zone and, their negative inotropic effects could represent an adaptative response to delimit the injury and to decrease myocardial energy demand. This significant upregulation of proinflammatory cytokines can extend to noninfarcted zone and triggers a second phase of elevated levels of cytokines that promote interstitial fibrosis and collagen deposition in the contralateral noninfarcted myocardium leading to a dysfunctional ventricle. This article will review the recent reports that support the idea of a cardioprotective role for this early inflammatory response and a deleterious role of the delayed response that mediate the fibrosis that is a typical feature of the remodeling process.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Remodelación cardíaca]]></kwd>
<kwd lng="es"><![CDATA[Citocinas]]></kwd>
<kwd lng="es"><![CDATA[inflamación]]></kwd>
<kwd lng="en"><![CDATA[Cardiac remodeling]]></kwd>
<kwd lng="en"><![CDATA[Cytokines]]></kwd>
<kwd lng="en"><![CDATA[Inflammation]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n b&aacute;sica</font></p>     <p align="justify">&nbsp;</p>     <p align="center"><font face="verdana" size="4"><b><i>Remodelaci&oacute;n card&iacute;aca e inflamaci&oacute;n</i></b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="3"><b>Cardiac remodeling and inflammation</b></font></p>     <p align="center">&nbsp;</p>     <p align="center"><font face="verdana" size="2"><b>Mart&iacute;n Mart&iacute;nez Rosas*</b></font></p>     <p align="center">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><i>* Departamento de Fisiolog&iacute;a, Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez.</i></font></p>     <p align="justify">&nbsp;</p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Correspondencia</b>:    <br>   <i>Dr. Mart&iacute;n Mart&iacute;nez Rosas.    <br>   Departamento de Fisiolog&iacute;a.    <br>   </i></font><font face="verdana" size="2"><i>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.).     <br>   Tel. 55 73 29 11 Ext. 1278</i></font></p>     <p align="justify">&nbsp;</p>     <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>     <p align="justify"><font face="verdana" size="2"> La remodelaci&oacute;n card&iacute;aca es una respuesta progresiva del coraz&oacute;n al da&ntilde;o agudo y cr&oacute;nico sin importar su etiolog&iacute;a. Este proceso es caracterizado por cambios en el tama&ntilde;o, en la forma y en la funci&oacute;n del coraz&oacute;n y est&aacute; asociado a un mal pron&oacute;stico en pacientes con insuficiencia card&iacute;aca. El infarto agudo del miocardio es la causa m&aacute;s com&uacute;n del proceso de remodelado. En los primeros minutos posteriores al da&ntilde;o en la zona isqu&eacute;mica existe un importante aumento en la s&iacute;ntesis y liberaci&oacute;n de citocinas proin&#150;flamatorias como el factor de necrosis tumoral&#150;alfa (TNF&#150;&#945;) la interleucina&#150;6 (IL&#150;6), la interleucina&#150;1&#150;beta (IL&#150;1&#946;) y el factor de crecimiento transformante&#150;1&#150;beta (TGF&#150;1&#946;). Esta liberaci&oacute;n aguda de citocinas podr&iacute;a regular la sobrevivencia o el proceso de apoptosis de los miocitos en la zona infartada y, sus efectos inotr&oacute;picos negativos pudieran representar una respuesta adaptativa para delimitar el da&ntilde;o y para disminuir la demanda de energ&iacute;a del miocardio. Esta significativa regulaci&oacute;n a la alta de las citocinas proinflamatorias puede extenderse a la zona no infartada y disparar una segunda fase de niveles elevados de citocinas que promueven la fibrosis intersticial y la deposici&oacute;n de col&aacute;gena en el miocardio no infartado contralateral llevando a un ventr&iacute;culo disfuncional. Este art&iacute;culo revisa los reportes recientes que apoyan la idea de un papel cardioprotector para esta respuesta inflamatoria primaria y un papel delet&eacute;reo a largo plazo de la respuesta tard&iacute;a que media la fibrosis caracter&iacute;stica del proceso de remodelaci&oacute;n.</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Palabras clave: </b>Remodelaci&oacute;n card&iacute;aca. Citocinas e inflamaci&oacute;n. </font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Summary</b></font></p>     <p align="justify"><font face="verdana" size="2"> The cardiac remodeling is a progressive response of the heart to acute and chronic insults regardless its etiology. This process is characterized by changes in the size, shape and function and is associated with a worse prognosis in patients with heart failure. The acute myocardial infarction is the most common cause of remodeling. In the first minutes after injury in the ischemic zone there is an important augment in the synthesis and release of proinflammatory cytokines such as tumor necrosis factor&#150;alpha (TNF&#150;&#945;) interleukin&#150;6 (IL&#150;6), interleukin&#150;1&#150;beta (IL&#150;1&#946;) and transforming growth factor 1&#150;beta (TGF&#150;1&#946;). This acute releasing of cytokines could regulate the survival or apoptosis of myocytes in infarcted zone and, their negative inotropic effects could represent an adaptative response to delimit the injury and to decrease myocardial energy demand. This significant upregulation of proinflammatory cytokines can extend to noninfarcted zone and triggers a second phase of elevated levels of cytokines that promote interstitial fibrosis and collagen deposition in the contralateral noninfarcted myocardium leading to a dysfunctional ventricle. This article will review the recent reports that support the idea of a cardioprotective role for this early inflammatory response and a deleterious role of the delayed response that mediate the fibrosis that is a typical feature of the remodeling process.</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Key words: </b>Cardiac remodeling. Cytokines. Inflammation.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Introducci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2"> La remodelaci&oacute;n card&iacute;aca es un conjunto de respuestas celulares card&iacute;acas que se desarrolla lenta y progresivamente ante pr&aacute;cticamente cualquier da&ntilde;o del coraz&oacute;n produciendo necrosis y fibrosis del tejido. La remodelaci&oacute;n lleva a cambios en el tama&ntilde;o, la forma y la funci&oacute;n del coraz&oacute;n hasta hacerlo insuficiente y en algunos casos produce aneurismas o su ruptura. Fue descrito por primera vez por McKay en 1986 quien observ&oacute; la expansi&oacute;n del infarto, la dilataci&oacute;n parcial del ventr&iacute;culo y una disminuci&oacute;n en la contractilidad en el &aacute;rea no infartada estableciendo el concepto de remodelaci&oacute;n ventricular izquierda.<sup>1</sup> Posteriormente se comprob&oacute; que en general, un infarto agudo al miocardio (IAM) extendido y transmural produce alteraciones en la topograf&iacute;a tanto de la regi&oacute;n infartada como de la no infartada y por lo tanto, que esta remodelaci&oacute;n afecta profundamente la funci&oacute;n del coraz&oacute;n y el pron&oacute;stico de sobrevida de los pacientes.<sup>2</sup></font></p>     <p align="justify"><font face="verdana" size="2"> La causa aguda m&aacute;s com&uacute;n de remodelaci&oacute;n card&iacute;aca es el IAM aunque podr&iacute;a ser cualquier patolog&iacute;a que resulte en una sobrecarga de presi&oacute;n o de volumen del coraz&oacute;n. As&iacute;, la hipertensi&oacute;n arterial cr&oacute;nica, la enfermedad cong&eacute;nita con comunicaci&oacute;n intracard&iacute;aca, las enfermedades valvulares o la miocardiopat&iacute;a dilatada pueden llevar a la remodelaci&oacute;n. Otras causas menos comunes son las infecciones virales y la exposici&oacute;n a toxinas o agentes quimioterap&eacute;uticos.<sup>3</sup> Aun cuando es evidente la importancia cl&iacute;nica de este proceso, hasta el momento no se han entendido completamente los mecanismos implicados.</font></p>     <p align="justify"><font face="verdana" size="2"> Actualmente se sabe que despu&eacute;s de que se presenta un IAM, el proceso de necrosis y el aumento en el estr&eacute;s mec&aacute;nico de la pared desencadenan una serie de eventos que incluyen una respuesta inflamatoria local de fase aguda que tiende a generalizarse<sup>4,5</sup> con acumulaci&oacute;n de polimorfonucleares y macr&oacute;fagos en el lugar de la lesi&oacute;n mioc&aacute;rdica y una activaci&oacute;n de los reactantes plasm&aacute;ticos de fase aguda como son los leucocitos, la prote&iacute;na C reactiva y un importante n&uacute;mero de citocinas pro&#150; y antiinflamatorias.<sup>6,7</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Adem&aacute;s de que se presentan &#150;con un curso temporal m&aacute;s lento&#150; respuestas adaptativas del miocardio al estr&eacute;s mec&aacute;nico en un intento para adaptarse a la elevaci&oacute;n en la tensi&oacute;n de la pared y mantener el gasto. Entre estas respuestas se encuentran la hipertrofia de los cardiomiocitos, su apoptosis y cambios en la composici&oacute;n y distribuci&oacute;n de los componentes de la matriz extracelular (MEC) sobre todo la col&aacute;gena<sup>8</sup> generando as&iacute;, la fibrosis que se extiende hasta la regi&oacute;n no infartada. Cabe recordar que dos tercios de la poblaci&oacute;n de c&eacute;lulas que forman el coraz&oacute;n lo constituyen c&eacute;lulas no musculares, principalmente fibroblastos y que estas c&eacute;lulas responden muy sensiblemente a se&ntilde;ales intercelulares modificando su fenotipo y liberando prote&iacute;nas de la MEC as&iacute; como diversos tipos de sustancias como metaloproteasas (MPPs), factores de crecimiento y citocinas.<sup>9,10</sup> Todos estos fen&oacute;menos &#150;principalmente la fibrosis&#150;, conducen a la disfunci&oacute;n diast&oacute;lica y sist&oacute;lica ventricular propias de la remodelaci&oacute;n que en &uacute;ltimo t&eacute;rmino llevan a la insuficiencia card&iacute;aca. De esta manera el proceso de remodelaci&oacute;n iniciado como una respuesta compensatoria al da&ntilde;o y al estr&eacute;s mec&aacute;nico, se convierte lentamente en un proceso que conduce a la disfunci&oacute;n ventricular progresiva.<sup>11</sup> El conocimiento detallado de los mecanismos que determinan la remodelaci&oacute;n card&iacute;aca permitir&aacute; el dise&ntilde;o de tratamientos que detengan el proceso y lo reviertan.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> Tomando en cuenta que despu&eacute;s del IAM se presenta una importante respuesta inflamatoria en la que se producen y liberan varias citocinas, surge la posibilidad de que el aumento en estos mediadores no sea s&oacute;lo un epifen&oacute;meno sino un mecanismo patog&eacute;nico subyacente primario. Existen diversas evidencias que fortalecen esta idea que revisaremos brevemente.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Citocinas proinflamatorias en la remodelaci&oacute;n</b></font></p>     <p align="justify"><font face="verdana" size="2"> Las citocinas son importantes mediadores del sistema inmune y se pueden subdividir en pro y antiinflamatorias. Est&aacute;n involucradas importantemente en procesos patol&oacute;gicos como el edema pulmonar, las anormalidades del m&uacute;sculo esquel&eacute;tico, la apoptosis de los miocitos, la disfunci&oacute;n endotelial y diferentes enfermedades card&iacute;acas.<sup>12</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Se ha reportado que en el per&iacute;odo agudo del IAM, aumenta la producci&oacute;n de varias citocinas, entre ellas el factor de necrosis tumoral alfa (TNF&#150;&#945;), la interleucina&#150;6 (IL&#150;6), la interleucina&#150;1 beta (IL&#150;1&#946;) y el factor de crecimiento transformante&#150;beta (TFG&#150;&#946;1).<sup>13,14</sup> Estas citocinas son consideradas las m&aacute;s relacionadas con el proceso de remodelaci&oacute;n ventricular postinfarto.<sup>15</sup> No se encuentran constitutivamente expresadas en el coraz&oacute;n en condiciones normales;<sup>16</sup> sin embargo ante un da&ntilde;o al miocardio, se presenta un gran aumento en sus niveles plasm&aacute;ticos.<sup>13&#150;16</sup> En modelos experimentales de infarto al miocardio se ha reportado un aumento de hasta 50 veces en los niveles de RNAm para TNF&#150;&#945;, IL&#150;6 e IL&#150;1 &#946;<i> </i>dentro de las primeras horas despu&eacute;s de la isquemia en el &aacute;rea infartada y un aumento de hasta 15 veces en la zona del miocardio no infartado.<sup>17</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Este gran aumento en el nivel de transcripci&oacute;n de dichas citocinas podr&iacute;a regresar a niveles b&aacute;sales si el infarto es peque&ntilde;o; sin embargo, si es grande o si la respuesta inflamatoria es particularmente intensa, entonces se mantiene el incremento de manera continua.<sup>17</sup> Es com&uacute;n que se presente un segundo aumento en los niveles de citocinas plasm&aacute;ticas que puede extenderse hasta zonas remotas no infartadas, mediando el proceso de remodelaci&oacute;n en el miocardio entero.<sup>15 </sup>La elevaci&oacute;n en la expresi&oacute;n de citocinas ocurre antes del incremento de la actividad de las MMPs (MMP&#150;2 y 9) en el &aacute;rea infartada, las cuales se han relacionado directamente con la remodelaci&oacute;n card&iacute;aca. De igual manera esta elevaci&oacute;n se presenta antes del incremento en la liberaci&oacute;n de los p&eacute;ptidos natriur&eacute;ticos PNA y PNB a los cuales se les ha atribuido un papel protector en el proceso de isquemia/reperfusi&oacute;n.<sup>17</sup> Asimismo, esta elevaci&oacute;n ocurre previa al aumento y al cambio en la distribuci&oacute;n de la col&aacute;gena en el miocardio no infartado.<sup>17</sup> Por lo que se cree que estas citocinas regulan de manera aguda las respuestas adaptativas al da&ntilde;o regulando la sobrevivencia de los miocitos, al regular el proceso de apoptosis. Adem&aacute;s, generan respuestas inflamatorias celulares adicionales que a largo plazo pueden mediar la reparaci&oacute;n y remodelaci&oacute;n del tejido a trav&eacute;s de activar mediadores como las MMPs y la consecuente formaci&oacute;n de col&aacute;gena, as&iacute; como el proceso de angiog&eacute;nesis.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>El TNF&#150;&#945;</b></font></p>     <p align="justify"><font face="verdana" size="2"> En el tejido card&iacute;aco las c&eacute;lulas que se han identificado como productoras de TNF&#150;&#945; son los macr&oacute;fagos, las c&eacute;lulas endoteliales y los propios cardiomiocitos, as&iacute; mismo se ha caracterizado la presencia de dos receptores a TNF&#150;&#945;: el tipo 1 (TNF&#150;RI) y el tipo 2 (TNF&#150;RII),<sup>18</sup> los cuales se pueden detectar en sus formas solubles llamadas sTNF&#150;RI y sTNF&#150;RII en la sangre y en la orina de los humanos.<sup>19</sup></font></p>     <p align="justify"><font face="verdana" size="2"> El TNF&#150;&#945; ha sido de las citocinas m&aacute;s estudiadas ya que tiene efectos directos sobre la funci&oacute;n contr&aacute;ctil disminuy&eacute;ndola y se ha demostrado que altera la homeostasis del calcio,<sup>20</sup> el acople excitaci&oacute;n&#150;contracci&oacute;n,<sup>21</sup> el metabolismo del &oacute;xido n&iacute;trico (ON)<sup>22</sup> y la se&ntilde;alizaci&oacute;n a trav&eacute;s de segundos mensajeros.<sup>23</sup> Adem&aacute;s de que el TNF&#150;&#945; podr&iacute;a facilitar la apoptosis, est&aacute; involucrado en la infiltraci&oacute;n de neutr&oacute;filos despu&eacute;s del da&ntilde;o isqu&eacute;mico.<sup>24</sup> Por otro lado, se ha demostrado que el TNF&#150;&#945; incrementa la expresi&oacute;n y la actividad de algunas MMPs (como las colagenasas MMP&#150;2 y la MMP&#150;9) as&iacute; como la alteraci&oacute;n diferencial de la expresi&oacute;n de los inhibidores de las MMPs llamados TIMPs,<sup>25</sup> permitiendo una desviaci&oacute;n de la relaci&oacute;n MMP/TDVIP hacia una mayor actividad proteol&iacute;tica con degradaci&oacute;n de col&aacute;gena y la reestructuraci&oacute;n de la MEC,<sup>26</sup> contribuyendo a la progresi&oacute;n de la dilataci&oacute;n card&iacute;aca.<sup>26,27</sup>De hecho, en ratones transg&eacute;nicos que sobreexpresan TNF&#150;&#945; espec&iacute;ficamente en el miocardio, se presenta una elevada actividad de las MMPs y se desarrolla dilataci&oacute;n card&iacute;aca.<sup>27</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> No se conocen a&uacute;n las v&iacute;as intracelulares que median los efectos del TNF&#150;&#945; en la remodelaci&oacute;n postinfarto pero su participaci&oacute;n en el proceso se ha demostrado completamente.<sup>17</sup> Las estrategias dirigidas a bloquear a los dos receptores de TNF&#150;&#945; en el IAM han generado resultados controversiales. Entre las evidencias experimentales cl&aacute;sicas que demuestran un papel central delet&eacute;reo para esta citocina en el remodelado se encuentra la ya mencionada de ratones tansg&eacute;nicos que sobreexpresan el TNF&#150;&#945; mioc&aacute;rdico en los cuales se desarrolla hipertrofia card&iacute;aca, fibrosis y posteriormente dilataci&oacute;n ventricular y mueren de forma prematura.<sup>26,27</sup>Esto adem&aacute;s de otras evidencias que incluyen la participaci&oacute;n del TNF&#150;&#945; en el da&ntilde;o por isquemia/reperfusi&oacute;n.<sup>28,29</sup> Por otro lado existe la evidencia cl&iacute;nica cl&aacute;sica en la que se utiliz&oacute; el etanercept, una mol&eacute;cula de alta afinidad por el TNF&#150;&#945; que al fijarse a esta citocina bloquea sus efectos biol&oacute;gicos. Se realizaron dos estudios preliminares con este f&aacute;rmaco. El primero de ellos fue realizado en pacientes con insuficiencia card&iacute;aca clase III y IV y con concentraciones circulantes de TNF&#150;<i>a </i>mayores a 3 pg/mL. Se report&oacute; adem&aacute;s de una falta de efectos secundarios importantes del f&aacute;rmaco, una reducci&oacute;n del 85% de las concentraciones biol&oacute;gicamente activas del TNF&#150;&#945; asociada a una mejor&iacute;a sintom&aacute;tica y a una mayor tolerancia al ejercicio.<sup>30</sup> En el segundo estudio se probaron 5 y 12 mg/m<sup>2</sup> de etanercept y se le dio un seguimiento de tres meses.<sup>31</sup> Los resultados ben&eacute;ficos medidos como mejor&iacute;a en la clasificaci&oacute;n funcional y calidad de vida, fueron dosis&#150;dependientes. Estos prometedores resultados llevaron al dise&ntilde;o de los estudios multic&eacute;ntricos RENAISSANCE, RECOVER y RENEWAL sobre el uso del etarnecept en la insuficiencia card&iacute;aca. Estos estudios fueron suspendidos al no encontrarse los beneficios de los estudios previos.<sup>32</sup> La explicaci&oacute;n de la aparente contradicci&oacute;n de los resultados fue simple: el TNF&#150;&#945; produce efectos ben&eacute;ficos de manera aguda y cuando se mantienen concentraciones elevadas se producen efectos delet&eacute;reos.</font></p>     <p align="justify"><font face="verdana" size="2"> Esta idea se ha ido fortaleciendo y reportes recientes han sugerido un efecto protector del TNF&#150;&#945; a corto plazo en el da&ntilde;o al miocardio y en consecuencia en la remodelaci&oacute;n ventricular.<sup>33,35</sup> Estos estudios se realizaron en ratones que no expresan receptores TNF&#150;RI y TNF&#150;RII. En este modelo, al producir un IAM por oclusi&oacute;n coronaria aguda, las &aacute;reas infartadas se incrementaron en un 40% comparado con los controles; adem&aacute;s de que se encontr&oacute; un aumento en el proceso de apoptosis mioc&aacute;rdica en el per&iacute;odo inmediato despu&eacute;s del infarto,<sup>33</sup> concluyendo los autores que la se&ntilde;alizaci&oacute;n que desencadena el TNF&#150;&#945; da lugar a una o m&aacute;s se&ntilde;ales cardioprotectoras que evitan y/o retardan el desarrollo de la apoptosis de los miocitos card&iacute;acos despu&eacute;s del da&ntilde;o isqu&eacute;mico agudo. Tales respuestas antiapopt&oacute;ticas se manifiestan cuando se exacerba la cardiotoxicidad de la Adriamicina, un agente quimioterap&eacute;utico, en este mismo modelo murino.<sup>34</sup> La cardioprotecci&oacute;n se relacion&oacute; con la fosfolipasa C&#150;&#948;l.<sup>35</sup> Estos hallazgos recientes son consistentes con estudios realizados desde la d&eacute;cada pasada que demuestran la cardioprotecci&oacute;n inducida por el TNF&#150;&#945;.<sup>36,37</sup>En esos estudios, la activaci&oacute;n selectiva de cualquiera de los dos receptores a TNF&#150;&#945;, con ligandos mutados espec&iacute;ficos, aten&uacute;a importantemente el da&ntilde;o celular por hipoxia/isquemia en miocitos card&iacute;acos de felino.<sup>36,37</sup></font></p>     <p align="justify"><font face="verdana" size="2"> En cuanto a los mecanismos citoprotectores, que activa el TNF&#150;&#945;, se ha descrito que una prote&iacute;na denominada "factor 2 asociado a receptores a TNF" (TRAF 2) est&aacute; involucrada en las v&iacute;as activadas por ambos receptores y que esta prote&iacute;na activa a su vez a NF&#150;kB<sup>38</sup> con un incremento resultante en la expresi&oacute;n de la super&oacute;xido dismutasa que es una potente enzima antioxidante que podr&iacute;a mediar los efectos protectores agudos del TNF&#150;&#945;. Adem&aacute;s de que est&aacute; demostrado que el TNF&#150;&#945; produce la expresi&oacute;n de otros factores antiapopt&oacute;ticos citoprotectores en varias l&iacute;neas celulares de mam&iacute;fero.<sup>39</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Este conjunto de estudios<sup>33&#150;37</sup> sugiere que el TNF&#150;&#945;<i> </i>regula la respuesta al estr&eacute;s del miocardio, al disparar se&ntilde;ales citoprotectoras antiapopt&oacute;ticas tempranamente, las cuales son responsables de delimitar el da&ntilde;o tisular y, se&ntilde;ales tard&iacute;as que facilitan la reparaci&oacute;n del tejido o su remodelaci&oacute;n. Sin embargo, &#150;como se dijo con respecto al uso de la estrategia de bloquear el efecto del TNF&#150;&#945;&#150;, es probable que los beneficios a corto plazo del TNF&#150;&#945; se pierdan si la expresi&oacute;n de TNF&#150;&#945; mioc&aacute;rdica llega a ser sostenida o excesiva, en cuyo caso los efectos ben&eacute;ficos del TNF&#150;&#945;<i> </i>podr&iacute;an ser contrarrestados por sus efectos inotr&oacute;picos negativos o citot&oacute;xicos ya descritos.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>La IL&#150;6</b></font></p>     <p align="justify"><font face="verdana" size="2"> La IL&#150;6 es producida durante la fase aguda de la respuesta inmune por diversos tipos celulares.<sup>40</sup></font></p>     <p align="justify"><font face="verdana" size="2"> De manera particular, la IL&#150;6 produce inducci&oacute;n de anticuerpos, hematopoyesis, trombocitopoyesis y s&iacute;ntesis de prote&iacute;nas de fase aguda.<sup>40</sup> La IL&#150;6 aumenta su s&iacute;ntesis en el miocardio ante el da&ntilde;o por isquemia/reperfusi&oacute;n, al igual que el TNF&#150;&#945;.<sup>15,17</sup> En pacientes se ha reportado que la IL&#150;6 se encuentra elevada en diversas patolog&iacute;as cardiovasculares como la falla card&iacute;aca cr&oacute;nica,<sup>41,42</sup> la miocarditis<sup>43</sup> el IAM,<sup>44&#150;46</sup> la endotoxemia<sup>47</sup> y el da&ntilde;o asociado a la isquemia/reperfusi&oacute;n<sup>48</sup> cuando se miden sus niveles s&eacute;ricos o el nivel de su RNAm y prote&iacute;na directamente en el tejido card&iacute;aco. En enfermedades cardiovasculares cr&oacute;nicas se ha encontrado una relaci&oacute;n directa entre los niveles de IL&#150;6 y la severidad de diversos estados patol&oacute;gicos cardiovasculares.<sup>41 </sup>Diversos estudios demuestran que esta citocina tiene un efecto negativo sobre la contractilidad card&iacute;aca. En estudios <i>in vitro </i>la IL&#150;6 disminuye la contractilidad en el m&uacute;sculo papilar aislado de coraz&oacute;n de hamster cuando se aplica por 2&#150;3 minutos.<sup>49</sup> En miocitos aislados la IL&#150;6 suprime el pico sist&oacute;lico del &#91;Ca<sup>2+</sup>&#93;i y el acortamiento celular en los siguientes 5 minutos posteriores a su aplicaci&oacute;n en miocitos embrionarios de pollo<sup>50</sup> y en miocitos ventriculares de cobayo adulto.<sup>51</sup> El mecanismo de este efecto inotr&oacute;pico negativo agudo inducido por la IL&#150;6 no se caracteriza en detalle, aunque diversos estudios involucran al ON como mediador intracelular. En este sentido se ha descrito que la supresi&oacute;n aguda de la contractilidad card&iacute;aca, inducida por la IL&#150;6, est&aacute; acompa&ntilde;ada de un incremento en la producci&oacute;n intracelular de GMP,<sup>50</sup> el cual es bloqueado por N&#150;monometil&#150;L&#150;arginina (L&#150;NMMA), un inhibidor de la sintasa de ON (SON) pero no por el EGTA. Esto sugiere que sus efectos estar&iacute;an mediados por una ruta dependiente de ON al activar a una isoforma de SON inducible (SONi).<sup>49&#150;</sup><sup>52</sup> En estos estudios se ha demostrado que la inhibici&oacute;n de la SONi bloquea la acci&oacute;n inotr&oacute;pica negativa de la IL&#150;6.<sup>52 </sup>Adicionalmente la IL&#150;6 afecta la funci&oacute;n del ret&iacute;culo sarcopl&aacute;smico (RS) al reducir la fosforilaci&oacute;n del fosfolamban, una prote&iacute;na reguladora de la bomba de calcio del RS.<sup>52</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Por otro lado se han observado eventos cardioprotectores no s&oacute;lo para IL&#150;6 sino para toda la familia de interleucinas 6 (IL&#150;6, factor inhibitorio de la leucemia, oncostatina M, factor neurotr&oacute;fico ciliar, IL&#150;11 y cardiotropina&#150;1). Se ha propuesto que sus efectos cardioprotectores act&uacute;an a trav&eacute;s de gpl30, una subunidad transductora de se&ntilde;ales compartida por los receptores de toda esta familia de citocinas.<sup>53</sup> Se propone que una vez que la IL&#150;6 &#150;o cualquier miembro de la familia&#150;, se une a su receptor, se produce la dimerizaci&oacute;n de gpl30. Este cambio estructural produce la activaci&oacute;n de JAK y la fosforilaci&oacute;n de gplSO<sup>53</sup>. Tales eventos llevan a la activaci&oacute;n de v&iacute;as intracelulares, que incluyen la activaci&oacute;n de Ras&#150;MAPK y la cinasa del fosfatidilinositol&#150;3, las cuales son potentes activadores de la transcripci&oacute;n celular.<sup>54</sup> La activaci&oacute;n de estas v&iacute;as resulta en respuestas citoprotectoras en el coraz&oacute;n, que preservar&iacute;an la integridad de la estructura celular e intersticial.<sup>55</sup> El papel significativo para la IL&#150;6 en la reparaci&oacute;n de tejidos se ha demostrado en experimentos en los cuales ratones que no expresan IL&#150;6 presentan un retardo muy grande en la recuperaci&oacute;n de heridas de la piel.<sup>56</sup> Este papel de la IL&#150;6 podr&iacute;a ser fundamental como mecanismo de reparaci&oacute;n temprana del da&ntilde;o mioc&aacute;rdico.</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>La IL&#150;1</b>&#946;</font></p>     <p align="justify"><font face="verdana" size="2"> Se ha relacionado la IL&#150;1 &#946; directamente con el proceso de remodelaci&oacute;n card&iacute;aca ya que no se expresa en el miocardio normal y, junto con el TNF&#150;<i>&#945; y </i>la IL&#150;6, aumenta su expresi&oacute;n despu&eacute;s del da&ntilde;o al miocardio.<sup>13,15,16</sup> Particularmente su expresi&oacute;n est&aacute; aumentada en la fase aguda del infarto al miocardio en ratas.<sup>17</sup> De manera similar al TNF&#150;&#945;, la IL&#150;1&#946; tiene efectos directos sobre el coraz&oacute;n inhibiendo la contractilidad card&iacute;aca en corazones perfundidos de rata.<sup>57</sup> Tambi&eacute;n de manera similar al TNF&#150;&#945;, induce hipertrofia de los miocitos card&iacute;acos al ser aplicada <i>in vitro y </i>su inhibici&oacute;n produce disminuci&oacute;n de la inflamaci&oacute;n aguda y de la apoptosis de los cardiomiocitos despu&eacute;s del da&ntilde;o por reperfusi&oacute;n en corazones de rata.<sup>58</sup></font></p>     <p align="justify"><font face="verdana" size="2"> La IL&#150;1&#946; parece actuar utilizando como mecanismo principal un incremento en la producci&oacute;n de ON en cardiomiocitos de rata por inducci&oacute;n de la expresi&oacute;n del gen de la SONi<sup>59</sup> similar al mecanismo de la IL&#150;6 explicado previamente. Este mecanismo ha sido caracterizado cl&aacute;sicamente para el interfer&oacute;n&#150;y y como mecanismo secundario del TNF&#150;&#945;.<sup>60</sup></font></p>     <p align="justify"><font face="verdana" size="2"> Recientemente se ha aceptado que el proceso de remodelaci&oacute;n aguda mediado por citocinas y c&eacute;lulas inflamatorias en el miocardio infartado tambi&eacute;n inicia el proceso de reparaci&oacute;n del tejido da&ntilde;ado. Interesantemente, durante la fase aguda del IAM, la IL&#150;1&#946; al igual que el TNF&#150;&#945; parecen tener un papel protector y regulan la recuperaci&oacute;n del tejido. Se ha reportado un aumento en la producci&oacute;n de col&aacute;gena tipos I y III por los fibroblastos del miocardio no infartado despu&eacute;s de producir un IAM en el coraz&oacute;n de rata.<sup>61</sup> Adem&aacute;s de que el tratamiento anti IL&#150;1&#946; poco despu&eacute;s del infarto lleva a una pobre reparaci&oacute;n del tejido da&ntilde;ado y a una deposici&oacute;n tard&iacute;a de col&aacute;gena.<sup>62 </sup>El papel reparador de esta citocina se comprob&oacute; al medir los niveles de expresi&oacute;n de los genes que codifican para el TNF&#150;&#945;, la IL&#150;1&#946; y la IL&#150;6, en un modelo de infarto en rata, en el cual tambi&eacute;n se observ&oacute; dilataci&oacute;n progresiva del ventr&iacute;culo izquierdo. En la regi&oacute;n infartada el nivel de expresi&oacute;n de estas tres citocinas aument&oacute; hasta alcanzar un pico a la semana, despu&eacute;s del cual decayeron r&aacute;pidamente. A las 20 semanas posteriores al infarto los niveles de expresi&oacute;n permanecieron mucho m&aacute;s altos en la regi&oacute;n no infartada que en la infartada o el control.<sup>15</sup> Entre estas citocinas el nivel de expresi&oacute;n del gen de la IL&#150;1&#946; fue el m&aacute;s alto y se correlacion&oacute; muy bien con la deposici&oacute;n de col&aacute;gena en el miocardio no infartado a las 8 y 20 semanas despu&eacute;s de la cirug&iacute;a. Bajo esta perspectiva, el efecto m&aacute;s importante de la IL&#150;1&#946; ser&iacute;a su efecto mitog&eacute;nico sobre los fibroblastos de la regi&oacute;n no infartada que llevar&iacute;a, en primera instancia, a la reparaci&oacute;n del da&ntilde;o y a la adaptaci&oacute;n mec&aacute;nica de la c&aacute;mara ventricular, pero tambi&eacute;n este proceso ser&iacute;a responsable a largo plazo, de alterar la distensibilidad del miocardio propia de la remodelaci&oacute;n. Con estas evidencias se propone que la activaci&oacute;n apropiada de citocinas en el miocardio da&ntilde;ado por la isquemia tiene un car&aacute;cter de protecci&oacute;n, llevando a una mejor recuperaci&oacute;n del da&ntilde;o y a un aumento en la sobrevivencia celular, a expensas de una contractilidad disminuida.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>El TFG&#150;</b>&#946;<b>1</b></font></p>     <p align="justify"><font face="verdana" size="2"> El TFG&#150;&#946;1 es una citocina que se incrementa tempranamente en la zona infartada, estimulando la quimiotaxis de macr&oacute;fagos y la proliferaci&oacute;n de fibroblastos.<sup>63</sup> Existen reportes de que en las primeras fases, tambi&eacute;n hay un incremento del interfer&oacute;n&#150;y que sumar&iacute;a su efecto de activaci&oacute;n de los macr&oacute;fagos produciendo ON, el cual incrementa la permeabilidad vascular y confina la respuesta inflamatoria celular a la zona infartada.<sup>64</sup> Los macr&oacute;fagos as&iacute; activados expresan enzima convertidora de angiotensina (ECA), la cual proporciona una fuente local de angiotensina (Ang)&#150;II que es regulada independientemente de la plasm&aacute;tica teniendo un papel central en la fibrosis reparativa.<sup>63</sup> Adem&aacute;s de que se ha propuesto que los propios miocitos en respuesta al estr&eacute;s mec&aacute;nico, son capaces de sintetizar y liberar angiotensin&oacute;geno y Ang&#150;II, lo que llevar&iacute;a a una mayor producci&oacute;n local de Ang&#150;II<sup>65,66</sup> aumentando la respuesta fibr&oacute;tica. &Eacute;ste es quiz&aacute;s parte del mecanismo por el cual los bloqueadores de los receptores a Ang&#150;I y a Ang&#150;II ejercen sus efectos ben&eacute;ficos en el remodelado y en la insuficiencia card&iacute;aca.</font></p>     <p align="justify"><font face="verdana" size="2"> La liberaci&oacute;n temprana de TFG&#150;/&#946;1 de los miocitos necr&oacute;ticos y de los macr&oacute;fagos es tambi&eacute;n importante en la transformaci&oacute;n fenot&iacute;pica de los fibroblastos a miofibroblastos. Los miofibroblastos expresan receptores a Ang&#150;I, Ang&#150;II, TFG&#150;&#946;3 y a endotelina 1 (ET&#150;1)<sup>63,67</sup> adem&aacute;s de expresar genes para procol&aacute;genas I y III. De esta manera tenemos un sistema de recambio de col&aacute;gena establecido en gran parte en estas c&eacute;lulas intersticiales.<sup>63,66,67</sup> El papel del TFG&#150;&#946;3 podr&iacute;a ser el de responder tempranamente para generar un mecanismo de amplificaci&oacute;n e interacci&oacute;n de las respuestas inflamatoria y neurohumoral para delimitar el &aacute;rea da&ntilde;ada e iniciar la fibrosis reparativa.</font></p>     <p align="justify"><font face="verdana" size="2"> &nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"> <b>Conclusi&oacute;n</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"> El esquema general de participaci&oacute;n de las diferentes citocinas en la remodelaci&oacute;n es complejo y esta condici&oacute;n aumenta al considerar la respuesta antiinflamatoria desencadenada tambi&eacute;n por el propio da&ntilde;o al miocardio. En este sentido, la citocina m&aacute;s estudiada es la IL&#150;10, la cual se caracteriza por disminuir la s&iacute;ntesis de citocinas proinflamatorias.<sup>68&#150;70</sup> En particular, la IL&#150;10 puede disminuir la producci&oacute;n de TNF&#150;&#945; y ON.</font></p>     <p align="justify"><font face="verdana" size="2"> Tomando en cuenta el conjunto de evidencias presentadas surge una idea central en las respuestas del miocardio da&ntilde;ado. Existen al menos dos mecanismos homeost&aacute;ticos interdependientes: uno, agudo, que permite que el tejido delimite el da&ntilde;o celular mediante la regulaci&oacute;n a la alta de factores citoprotectores/antiapopt&oacute;ticos y otro que facilite la reparaci&oacute;n del tejido en un plazo m&aacute;s tard&iacute;o o cuando estas respuestas citoprotectoras son insuficientes para evitar la muerte celular. Tomando un comentario de Mann<sup>16</sup> con respecto al resultado poco alentador de los estudios RENAISSANCE, RECOVER y RENEWAL: "Altos niveles de TNF deben ser delet&eacute;reos mientras que bajos niveles fisiol&oacute;gicos deben ser ben&eacute;ficos en la remodelaci&oacute;n postinfarto". Estas palabras podr&iacute;an ser aplicadas a la gran mayor&iacute;a de citocinas liberadas durante el da&ntilde;o agudo al miocardio, lo que implica que se requiera conocer en detalle los mecanismos responsables de orquestar estas respuestas, permitiendo as&iacute; un mejor abordaje terap&eacute;utico.</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.&nbsp;McKay RG, Pfeffer MA, Pasternak RC, Markis JE, Come PC, Nakao S, at al. <i>Left ventricular remodeling after myocardial infarction: a corollary to infarct expansion. </i>Circulation 1986; 74: 693&#150;702.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1057583&pid=S1405-9940200600080000600001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2"> 2.&nbsp;Pfeffer MA, Braunwald E: <i>Ventricular remodeling after myocardial infarction. </i>Circulation 1990; 81:1161&#150;1172.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1057584&pid=S1405-9940200600080000600002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2"> 3.&nbsp;Sutton MG, Sharpe N: <i>Left ventricular remodeling after myocardial infarction: pathophysiology and therapy. </i>Circulation 2000; (25)101: 2981&#150;2988.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1057585&pid=S1405-9940200600080000600003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2"> 4.&nbsp;Hansen PR: <i>Role of neutrophils in myocardial ischemia and reperfusion. </i>Circulation 1995; 91: 1872&#150;1885.</font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1057586&pid=S1405-9940200600080000600004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p align="justify"><font face="verdana" size="2"> 5.&nbsp;Laskin DL, Pendido KL: <i>Macrophages and inflammatory mediators in tissue injury. </i>Annu Rev Pharmacol. 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