<?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>0120-5633</journal-id>
<journal-title><![CDATA[Revista Colombiana de Cardiología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Colomb. Cardiol.]]></abbrev-journal-title>
<issn>0120-5633</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Colombiana de Cardiologia. Oficina de Publicaciones]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-56332011000500006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Papel de la proteína c reactiva en las enfermedades cardiovasculares]]></article-title>
<article-title xml:lang="en"><![CDATA[Role of C-reactive protein in cardiovascular diseases]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Manzur]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvear]]></surname>
<given-names><![CDATA[Ciro]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alayón]]></surname>
<given-names><![CDATA[Alicia Norma]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Cartagena Facultad de Medicina ]]></institution>
<addr-line><![CDATA[Cartagena ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Grupo Investigaciones Biomédicas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>10</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>10</month>
<year>2011</year>
</pub-date>
<volume>18</volume>
<numero>5</numero>
<fpage>273</fpage>
<lpage>278</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-56332011000500006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-56332011000500006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-56332011000500006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La proteína C-reactiva (PCR), un marcador sensible de inflamación, es un predictor independiente de enfermedad cardiovascular futura (ECV), que es una de las principales causas de muerte en todo el mundo. El papel de la inflamación en esta entidad ha sido bien documentado en la última década, y se ha demostrado inflamación en todas las fases de la aterosclerosis, desde el inicio y el crecimiento, hasta la ruptura de la placa. La PCR es una proteína de fase aguda, altamente sensible como marcador de inflamación general. En estudios experimentales, se ha determinado la presencia de PCR en arterias que presentan lesiones ateroscleróticas. También se ha demostrado que, en forma directa, la PCR induce la producción de otras células inflamatorias y que disminuye la expresión de la óxido nítrico sintetasa. Es decir, desde el punto de vista biológico, la PCR participa en el proceso aterogénico. En adultos, la PCR, detectada con técnicas ultrasensibles (PCRus), se asocia con los factores de riesgo tradicionales y su concentración predice eventos cardiovasculares.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[C-reactive protein (CRP), a sensitive marker of inflammation is an independent predictor of future cardiovascular disease (CVD), which is one of the main causes of death worldwide. The role of inflammation in cardiovascular disease has been well documented in the last decade, and inflammation has been demonstrated in all stages of atherosclerosis, from its beginning and growth to the plaque rupture. CRP is an acute phase protein, highly sensitive as a marker of general inflammation. The presence of CRP has been determined in experimental studies in arteries with atherosclerotic lesions. It has been demonstrated as well that CRP induces directly the production of other inflammatory cells and decreases the expression of nitric oxide synthase. This means that from the biological standpoint CRP takes part in the atherogenic process. In adults, CRP detected through high sensitive CRP-test (hs-CRP) is associated to traditional risk factors and its concentration predicts cardiovascular events.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[proteína C reactiva]]></kwd>
<kwd lng="es"><![CDATA[factores de riesgo]]></kwd>
<kwd lng="es"><![CDATA[adiposidad]]></kwd>
<kwd lng="es"><![CDATA[obesidad]]></kwd>
<kwd lng="en"><![CDATA[C-reactive protein]]></kwd>
<kwd lng="en"><![CDATA[risk factors]]></kwd>
<kwd lng="en"><![CDATA[adiposity]]></kwd>
<kwd lng="en"><![CDATA[obesity]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font size="2" face="Verdana"> <font size="4" face="Verdana">    <center>   <b>Papel de la prote&iacute;na c reactiva en las enfermedades cardiovasculares</b> </center></font>    <br> <font size="3" face="Verdana">    <center>   <b> Role of C-reactive protein in cardiovascular diseases</b> </center></font>     <p>    <center> Fernando Manzur, MD., FACC.(1, 2); Ciro Alvear, QF., MSc. (1, 2, 3, 4); Alicia Norma Alay&oacute;n, Bact., MSc. (5, 6)</center></p>     <p> (1) 	Facultad de Medicina, Universidad de Cartagena. Cartagena, Colombia.    <br> (2) 	Grupo CIB (Centro de diagn&oacute;stico cardiol&oacute;gico para la investigaci&oacute;n biom&eacute;dica). 		Categorizaci&oacute;n B de Colciencias.    <br> (3) 	Grupo Bioqu&iacute;mica y Metabolismo (BYME). Categorizaci&oacute;n C de Colciencias.    <br> (4) 	Grupo Bioqu&iacute;mica y Enfermedad. Categorizaci&oacute;n B de Colciencias.    ]]></body>
<body><![CDATA[<br> (5) 	Grupo Investigaciones Biom&eacute;dicas (GIB).    <br> (6) 	Facultad de Ciencias de la Salud. Programa de Bacteriolog&iacute;a. Universidad de San 		Buenaventura. Cartagena, Colombia.</p>     <p> <b>Correspondencia</b>: Dr. Fernando Manzur. Centro de Diagn&oacute;stico Cardiol&oacute;gico. Tel.: (095) 6 65 22 90. Correo electr&oacute;nico: <a href="mailto:fmanzur1954@hotmail.com" target="_new">fmanzur1954@hotmail.com</a></p>     <p> Recibido: 03/06/2010. Aceptado: 10/05/2011.</p> <hr size="1">       <p>  La prote&iacute;na C-reactiva (PCR), un marcador sensible de inflamaci&oacute;n, es un predictor independiente de enfermedad cardiovascular futura (ECV), que es una de las principales causas de muerte en todo el mundo. El papel de la inflamaci&oacute;n en esta entidad ha sido bien documentado en la &uacute;ltima d&eacute;cada, y se ha demostrado inflamaci&oacute;n en todas las fases de la aterosclerosis, desde el inicio y el crecimiento, hasta la ruptura de la placa. La PCR es una prote&iacute;na de fase aguda, altamente sensible como marcador de inflamaci&oacute;n general. En estudios experimentales, se ha determinado la presencia de PCR en arterias que presentan lesiones ateroscler&oacute;ticas. Tambi&eacute;n se ha demostrado que, en forma directa, la PCR induce la producci&oacute;n de otras c&eacute;lulas inflamatorias y que disminuye la expresi&oacute;n de la &oacute;xido n&iacute;trico sintetasa. Es decir, desde el punto de vista biol&oacute;gico, la PCR participa en el proceso aterog&eacute;nico. En adultos, la PCR, detectada con t&eacute;cnicas ultrasensibles (PCRus), se asocia con los factores de riesgo tradicionales y su concentraci&oacute;n predice eventos cardiovasculares. </p>       <p><b><i>Palabras clave</i></b>: prote&iacute;na C reactiva, factores de riesgo, adiposidad, obesidad.</p> <hr size="1">       <p>C-reactive protein (CRP), a sensitive marker of inflammation is an independent predictor of future cardiovascular disease (CVD), which is one of the main causes of death worldwide. The role of inflammation in cardiovascular disease has been well documented in the last decade, and inflammation has been demonstrated in all stages of atherosclerosis, from its beginning and growth to the plaque rupture. CRP is an acute phase protein, highly sensitive as a marker of general inflammation. The presence of CRP has been determined in experimental studies in arteries with atherosclerotic lesions. It has been demonstrated as well that CRP induces directly the production of other inflammatory cells and decreases the expression of nitric oxide synthase. This means that from the biological standpoint CRP takes part in the atherogenic process. In adults, CRP detected through high sensitive CRP-test (hs-CRP) is associated to traditional risk factors and its concentration predicts cardiovascular events.</p>       <p><b><i>Keywords</i></b>: C-reactive protein, risk factors, adiposity, obesity.</p> <hr size="1">   <font size="3" face="Verdana"><b>Introducci&oacute;n</b></font>     <p>La prote&iacute;na C-reactiva (PCR) es un marcador sensible de inflamaci&oacute;n, as&iacute; como un predictor independiente de enfermedad cardiovascular futura, la cual es una de las principales causas de muerte en todo el mundo. El papel de la inflamaci&oacute;n en esta entidad ha sido bien documentado en la &uacute;ltima d&eacute;cada, y se ha demostrado inflamaci&oacute;n en todas las fases de la aterosclerosis, abarcando desde los momentos del inicio y el crecimiento, hasta la ruptura de la placa (1).</p>       <p>Diversos estudios epidemiol&oacute;gicos muestran que los niveles s&eacute;ricos de PCR tienen valor predictivo para el desarrollo de s&iacute;ndromes coronarios agudos, eventos vasculares cerebrales, enfermedad arterial perif&eacute;rica y muerte s&uacute;bita card&iacute;aca (2).</p>       ]]></body>
<body><![CDATA[<p>La PCR es el biomarcador m&aacute;s estudiado de la inflamaci&oacute;n en enfermedades cardiovasculares (3). Entre hombres aparentemente sanos, el nivel b&aacute;sico de la inflamaci&oacute;n, seg&uacute;n la evaluaci&oacute;n de los niveles s&eacute;ricos de PCR, predice el riesgo a largo plazo de un primer infarto del miocardio, accidente cerebrovascular isqu&eacute;mico, enfermedad vascular perif&eacute;rica, y mortalidad por cualquier causa. La asociaci&oacute;n entre PCR y enfermedad cardiovascular persiste despu&eacute;s de los ajustes para edad, tabaquismo, niveles de l&iacute;pidos, presi&oacute;n arterial, &iacute;ndice de masa corporal, diabetes, nivel de ejercicio y antecedentes familiares de enfermedad cardiovascular (4-9). Por lo tanto, la PCR es un factor importante que determina el riesgo de enfermedad cardiovascular y accidente cerebrovascular.</p>       <p>Factores de riesgo tradicionales como la hipertensi&oacute;n arterial, el tabaquismo y el colesterol elevado, se relacionan de manera contundente con un mayor riesgo de enfermedad cardiovascular ateroscler&oacute;tica. Sin embargo, muchas personas con riesgo aparente bajo, sufren ataques card&iacute;acos. Cerca de 80% de los pacientes coronarios tienen niveles de colesterol similares a los de otros individuos que no desarrollan dicha enfermedad. Por esa raz&oacute;n hace alg&uacute;n tiempo surgi&oacute; el concepto de nuevos factores de riesgo identificados a partir de la investigaci&oacute;n etiopatog&eacute;nica de la aterosclerosis, los cuales fueron respaldados en observaciones cl&iacute;nicas, epidemiol&oacute;gicas y de laboratorio. Varios de estos factores son considerados en la actualidad predictores de riesgo independiente, y entre estos se resalta la PCR. </p>       <p>Por lo expuesto, el objetivo de esta revisi&oacute;n es evidenciar que la b&uacute;squeda de factores de riesgo no tradicionales como la PCR, puede ser cl&iacute;nicamente &uacute;til en cierto tipo de pacientes, en quienes, por sus caracter&iacute;sticas, ameritar&iacute;a incluir estos marcadores biol&oacute;gicos de respuesta inflamatoria involucrados estrechamente en la patofisiolog&iacute;a de la aterotrombosis. </p>   <b><font size="3" face="Verdana">Inflamaci&oacute;n, biomarcadores de inflamaci&oacute;n y enfermedad cardiovascular</font>   </b>     <p>La inflamaci&oacute;n es una reacci&oacute;n protectora del tejido conjuntivo vascular a est&iacute;mulos da&ntilde;inos, incluyendo la infecci&oacute;n. La respuesta inflamatoria se asocia con vasodilataci&oacute;n, aumento de la permeabilidad vascular, reclutamiento de c&eacute;lulas inflamatorias (especialmente neutr&oacute;filos en la inflamaci&oacute;n aguda), liberaci&oacute;n de mediadores de la inflamaci&oacute;n de estas c&eacute;lulas (incluyendo aminas vasoactivas, prostanoides e intermediarios reactivos del ox&iacute;geno), y liberaci&oacute;n de citoquinas. Las citoquinas derivadas de macr&oacute;fagos como IL-1 e IL-6, son las principales responsables de la respuesta de fase aguda, una variaci&oacute;n protectora en la producci&oacute;n de prote&iacute;nas plasm&aacute;ticas por los hepatocitos. Las respuestas de algunas de las prote&iacute;nas de fase aguda m&aacute;s importantes se indican en la <a href="#tabla1">tabla 1</a>.</p>       <p>    <center><a name="tabla1"></a>    <br>   <img src="img/revistas/rcca/v18n5/v18n5a6t1.gif"></center></p>     <p>Por tanto, parece existir una relaci&oacute;n de doble sentido (causa-efecto, efecto-causa) entre la inflamaci&oacute;n y la aterosclerosis. Estudios en la poblaci&oacute;n general han revelado la existencia de una relaci&oacute;n entre la elevaci&oacute;n de los marcadores de inflamaci&oacute;n y el desarrollo posterior de eventos cardiovasculares. Las infecciones por algunos virus y bacterias podr&iacute;an estar relacionadas con la formaci&oacute;n y el desarrollo de la placa de ateroma. Del mismo modo, la inflamaci&oacute;n cr&oacute;nica de origen autoinmune (artritis reumatoide, lupus eritematoso), incrementa notablemente el riesgo de enfermedad cardiovascular. Otros estudios han contribuido a establecer de manera firme la idea de que la aterosclerosis es un proceso inflamatorio (10-13). </p>       <p>En el s&iacute;ndrome coronario agudo se han descrito varios biomarcadores inflamatorios. Entre estos marcadores biol&oacute;gicos, la interleucina-6 (IL6) desempe&ntilde;a un papel importante en la respuesta de la fase aguda, ya que induce la liberaci&oacute;n de PCR y est&aacute; involucrada en la progresi&oacute;n de la placa ateroscler&oacute;tica (14-17). </p>       <p>Por su parte, el diagn&oacute;stico bioqu&iacute;mico de inflamaci&oacute;n se establece mediante la comprobaci&oacute;n de una elevaci&oacute;n de los niveles plasm&aacute;ticos de mediadores inflamatorios (interleucinas: IL-6, IL-1beta, factor de necrosis tumoral alfa), o de determinadas prote&iacute;nas denominadas &laquo;reactantes de fase aguda&raquo; de signo positivo, como la prote&iacute;na C reactiva (PCR), la prote&iacute;na amiloide s&eacute;rica A (SAA), el fibrin&oacute;geno, la alfa-1-antitripsina, la fibronectina, entre otras. El incremento plasm&aacute;tico de estas &uacute;ltimas prote&iacute;nas de s&iacute;ntesis hep&aacute;tica, es el resultado de una inducci&oacute;n enzim&aacute;tica causada en la mayor&iacute;a de los casos por los mediadores inflamatorios, principalmente por la IL-6. </p>       ]]></body>
<body><![CDATA[<p>Al mismo tiempo, estos mediadores inflamatorios tambi&eacute;n son capaces de inhibir la s&iacute;ntesis hep&aacute;tica de la alb&uacute;mina, la transtirretina (prealb&uacute;mina) y la transferrina, prote&iacute;nas que pueden ser consideradas como &laquo;reactantes de fase aguda&raquo; de signo negativo, mientras que dentro del grupo de los denominados &laquo;reactantes de fase aguda&raquo; de signo positivo se destaca la PCR (18). </p>   <b><font size="3" face="Verdana">La PCR y su papel en la enfermedad cardiovascular</font>   </b>     <p>La prote&iacute;na C reactiva (tambi&eacute;n denominada CRP por su sigla en ingl&eacute;s), llamada as&iacute; por su capacidad para precipitar el polisac&aacute;rido-C som&aacute;tico del Streptococcus pneumoniae, fue la primera prote&iacute;na de fase aguda que se describi&oacute; y fue descubierta en 1930 por Tillet y Frances. </p>       <p>Forma parte de la inmunidad innata y su s&iacute;ntesis es inducida como respuesta al da&ntilde;o tisular por infecciones, inflamaci&oacute;n o neoplasias. Es sintetizada por hepatocitos y c&eacute;lulas del endotelio vascular, y su expresi&oacute;n est&aacute; regulada por citoquinas, particularmente por la interleucina 6 (IL-6) y, en menor grado, la interleucina 1 (IL-1) y el factor de necrosis tumoral a (TNF-a).</p>       <p>La PCR es una prote&iacute;na de la familia de las pentraxinas (18), llamada as&iacute; porque tiene cinco subunidades id&eacute;nticas, codificadas por un &uacute;nico gen en el cromosoma 1, que se asocian para formar una estructura estable pentam&eacute;rica como un disco, y tiene un peso molecular aproximado de 105 kD. </p>       <p>La PCR constituye un marcador muy sensible de inflamaci&oacute;n o da&ntilde;o tisular y su concentraci&oacute;n en el suero puede incrementarse con rapidez en respuesta a gran variedad de est&iacute;mulos. Las condiciones m&aacute;s comunes asociadas con elevaciones importantes de los niveles de PCR se muestran en la <a href="#tabla2">tabla 2</a>. La &uacute;nica condici&oacute;n que interfiere con la respuesta &laquo;normal&raquo; de la PCR es el deterioro hepatocelular grave. En condiciones normales, pr&aacute;cticamente no se encuentra presente en el torrente sangu&iacute;neo (18). </p>       <p>    <center><a name="tabla2"></a>    <br>   <img src="img/revistas/rcca/v18n5/v18n5a6t2.gif"></center></p>     <p>As&iacute; mismo, es el marcador inflamatorio m&aacute;s utilizado en la pr&aacute;ctica cl&iacute;nica, y su importancia no s&oacute;lo radica en su fiabilidad, sino que junto con algunos otros reactantes de fase aguda ha demostrado ser parte activa del mecanismo patog&eacute;nico de la aterosclerosis (19). Estudios prospectivos evidencian que las concentraciones plasm&aacute;ticas aumentadas de peque&ntilde;a magnitud de PCR, a&uacute;n dentro de l&iacute;mites que antes se consideraban &laquo;normales&raquo; (por debajo de 10 mg/L), predicen episodios cardiovasculares agudos en individuos en apariencia saludables y asintom&aacute;ticos, al margen de otros factores de riesgo cardiovascular (20, 21). </p>       <p>La caracter&iacute;stica que define la funcionalidad de la PCR es su capacidad de unir ligandos espec&iacute;ficos dependientes de calcio, y en este sentido se une con alta afinidad a mol&eacute;culas que contienen fosfocolina. De igual forma, se une con gran afinidad a una amplia variedad de ligandos tanto aut&oacute;logos (lipoprote&iacute;nas plasm&aacute;ticas nativas y modificadas, membranas celulares da&ntilde;adas, residuos de fosfatidilcolina, histonas, cromatina, ribonucleoprote&iacute;nas peque&ntilde;as y c&eacute;lulas apopt&oacute;ticas), como heter&oacute;logos (glucanos, fosfol&iacute;pidos y otros componentes som&aacute;ticos y capsulares de bacterias, hongos y par&aacute;sitos). </p>       ]]></body>
<body><![CDATA[<p>Cuando est&aacute; unida a ligandos macromoleculares activa la v&iacute;a cl&aacute;sica del complemento. Al parecer, esa capacidad para activar el complemento y opsonizar part&iacute;culas, es importante en la respuesta de la inmunidad innata frente a los pat&oacute;genos.</p>       <p>La s&iacute;ntesis de novo de la PCR comienza a las seis horas despu&eacute;s de iniciado el est&iacute;mulo inflamatorio y alcanza su m&aacute;ximo a las 24 a 72 horas. Su vida media es relativamente corta (19 horas), pero su concentraci&oacute;n plasm&aacute;tica es constante bajo cualquier condici&oacute;n y no se modifica con la ingesti&oacute;n de alimentos ni presenta variaci&oacute;n circadiana, en contraste con las prote&iacute;nas de la coagulaci&oacute;n y otras de fase aguda. Una vez finalizado el est&iacute;mulo de la IL-6, la PCR regresa a valores normales al cabo de siete d&iacute;as. Con esto, el &iacute;ndice de producci&oacute;n de la PCR es el &uacute;nico determinante de los niveles circulantes de la prote&iacute;na, reflejando en forma directa la intensidad de los procesos patol&oacute;gicos que estimularon su s&iacute;ntesis.</p>       <p>Los niveles de esta prote&iacute;na son realmente bajos en condiciones en las que no existe un proceso inflamatorio de relevancia cl&iacute;nica. En esas condiciones las t&eacute;cnicas originales de determinaci&oacute;n de PCR no permiten discriminar la relevancia cl&iacute;nica de los valores, raz&oacute;n por la cual se requieren t&eacute;cnicas de mayor sensibilidad, conocidas como PCR ultrasensibles (PCRus).</p>       <p>Varios estudios han demostrado que la PCR podr&iacute;a participar de forma directa o indirecta en el da&ntilde;o vascular (<a href="#tabla3">Tabla 3</a>). Estos hallazgos dan un vuelco importante a la relaci&oacute;n entre inflamaci&oacute;n y enfermedad cardiovascular, y ofrecen una explicaci&oacute;n al origen del deterioro vascular asociado con las enfermedades infecciosas e inflamatorias cr&oacute;nicas (22-30). </p>       <p>    <center><a name="tabla3"></a>    <br>   <img src="img/revistas/rcca/v18n5/v18n5a6t3.gif"></center></p>     <p>Por su capacidad para depositarse en la &iacute;ntima de las arterias, la PCR provoca disfunci&oacute;n del endotelio, lo que facilita la activaci&oacute;n, la migraci&oacute;n y el alojamiento de los leucocitos en el interior de la &iacute;ntima arterial. Esto contribuye a la formaci&oacute;n de lesiones vasculares que son la base del desarrollo de la aterosclerosis. Cuando las LDL alcanzan cierto umbral de concentraci&oacute;n en la sangre, penetran al interior de la pared arterial donde son modificadas por procesos de oxidaci&oacute;n. La PCR se une a estas lipoprote&iacute;nas (tanto a las nativas como a las oxidadas) y facilita su fagocitosis e internalizaci&oacute;n mediada por los macr&oacute;fagos de la &iacute;ntima arterial, promoviendo la formaci&oacute;n de c&eacute;lulas espumosas (macr&oacute;fagos con grandes cantidades de l&iacute;pidos oxidados en su interior). La acumulaci&oacute;n de c&eacute;lulas espumosas es determinante para la evoluci&oacute;n patog&eacute;nica de una placa arterial, haci&eacute;ndola m&aacute;s propensa a erosionarse o romperse y liberando su contenido trombog&eacute;nico. Esta propiedad protromb&oacute;tica tambi&eacute;n se suma a la capacidad de la PCR para inducir la producci&oacute;n de factor tisular (iniciador de la cascada de coagulaci&oacute;n) por los macr&oacute;fagos activados (31).</p>       <p>La PCR tambi&eacute;n induce un incremento en la s&iacute;ntesis de metaloproteasas, enzimas cr&iacute;ticas que aceleran la degradaci&oacute;n de diversos componentes de la matriz extracelular, causando debilitamiento de la capa fibrosa de las placas. Todos estos factores desestabilizan la placa de ateroma, haci&eacute;ndola m&aacute;s vulnerable a la ruptura (32). </p>       <p>Por otra parte, la obesidad de distribuci&oacute;n central parece incrementar a&uacute;n m&aacute;s los niveles de PCR, debido a que la grasa intra-abdominal es capaz de generar tres veces m&aacute;s IL-6 que la grasa subcut&aacute;nea, y a que el drenaje venoso de esta grasa fluye directamente hacia el h&iacute;gado. Se ha demostrado que el adipocito es capaz de expresar ARNm de la PCR (33-35).</p>       ]]></body>
<body><![CDATA[<p>Todos estos hallazgos han hecho que, en fecha reciente, los Centros para el Control de Enfermedades de Estados Unidos (CDC) y la Asociaci&oacute;n Americana del Coraz&oacute;n (AHA) hayan propuesto que la medici&oacute;n de la concentraci&oacute;n de PCRus fuera usada como parte de la evaluaci&oacute;n del riesgo de enfermedad cardiovascular en la pr&aacute;ctica cl&iacute;nica (36).</p>       <p>En Colombia se demostr&oacute; que los sujetos con un per&iacute;metro de cintura mayor o igual a 88 cm, presentaban concentraciones significativamente mayores de prote&iacute;na C reactiva ultrasensible y mayor recuento de leucocitos. Recientemente, en una muestra representativa de ni&ntilde;os escolares de Bucaramanga, se seleccionaron 325 (edad promedio 10 a&ntilde;os), en quienes se demostr&oacute; la existencia de una correlaci&oacute;n positiva entre &iacute;ndice de masa corporal, presi&oacute;n arterial sist&oacute;lica y PCR, lo que confirma, en ni&ntilde;os, la correlaci&oacute;n que previamente se demostr&oacute; en adultos colombianos, y refuerza la propuesta de una interrelaci&oacute;n entre el contenido de adipocitos viscerales y el aumento de las concentraciones plasm&aacute;ticas de marcadores de inflamaci&oacute;n como la PCR (37-40).</p>   <b><font size="3" face="Verdana">Conclusiones y recomendaciones</font>   </b>     <p>Sin duda alguna, la PCR es el marcador inflamatorio m&aacute;s conocido (41). Se ha demostrado que, en forma directa, la PCR induce la producci&oacute;n de otras c&eacute;lulas inflamatorias con posterior desarrollo de eventos cardiovasculares. Es decir, desde el punto de vista biol&oacute;gico, la PCR participa en el proceso aterog&eacute;nico.</p>       <p>En prevenci&oacute;n primaria, diversos estudios han demostrado que las concentraciones basales de PCR son capaces de predecir eventos vasculares.</p>       <p>Debido al aumento acelerado de las enfermedades cardiovasculares en nuestras poblaciones y a la evidencia continua sobre las elevadas prevalencias de factores de riesgo cardiovascular no tradicionales, como la PCR, urgen acciones de salud p&uacute;blica preventivas y eficientes para controlar esta problem&aacute;tica. Entre &eacute;stas debe darse prioridad a promover h&aacute;bitos de vida saludables, en especial una alimentaci&oacute;n sana; favorecer la pr&aacute;ctica de mayor actividad f&iacute;sica y recreativa, evitar el tabaquismo y mantener un control adecuado de otras patolog&iacute;as como el s&iacute;ndrome metab&oacute;lico, la diabetes mellitus, la hipertensi&oacute;n arterial y las dislipidemias. </p>   <font size="3" face="Verdana"><b>Bibliograf&iacute;a</b></font>     <!-- ref --><p>1. 	Danesh J, Wheeler JG, Hirschfield GM, et al. C-reactive protein and other circulating markers of inflammation in the prediction of coronary heart disease. 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<surname><![CDATA[Danesh]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
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<given-names><![CDATA[MB]]></given-names>
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</person-group>
<article-title xml:lang="en"><![CDATA[C-reactive protein and coronary heart disease: a critical review]]></article-title>
<source><![CDATA[J Intern Med]]></source>
<year>2008</year>
<volume>264</volume>
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</ref>
</ref-list>
</back>
</article>
