<?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>0120-4157</journal-id>
<journal-title><![CDATA[Biomédica]]></journal-title>
<abbrev-journal-title><![CDATA[Biomédica]]></abbrev-journal-title>
<issn>0120-4157</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-41572011000100006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Papel de los anticuerpos antiplaquetarios en la infección viral: una revisión sistemática de la literatura]]></article-title>
<article-title xml:lang="en"><![CDATA[Roll of antibodies antiplatelets in viral infection: a systematic review of literature]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montenegro-Medina]]></surname>
<given-names><![CDATA[Yenny M]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rey-Caro]]></surname>
<given-names><![CDATA[Luz Aída]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Niederbacher]]></surname>
<given-names><![CDATA[Jurg]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Vega]]></surname>
<given-names><![CDATA[Ruth Aralí]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Díaz-Quijano]]></surname>
<given-names><![CDATA[Fredi Alexander]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villar-Centeno]]></surname>
<given-names><![CDATA[Luis ángel]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Industrial de Santander Grupo de Epidemiología Clínica ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2011</year>
</pub-date>
<volume>31</volume>
<numero>1</numero>
<fpage>35</fpage>
<lpage>43</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-41572011000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-41572011000100006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-41572011000100006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción. La trombocitopenia es un fenómeno frecuente en las infecciones virales. Uno de los mecanismos propuesto como posible explicación de su desarrollo es la destrucción plaquetaria periférica mediada por anticuerpos antiplaquetarios. Objetivo. Revisar los resultados de los trabajos originales que existen en la literatura sobre infección viral y anticuerpos antiplaquetarios en humanos, y su efecto sobre el recuento total de plaquetas. Materiales y métodos. Se hizo una búsqueda en PubMed empleando la combinación de términos: ”viral infection (OR Virus diseases) AND antibody antiplatelet (OR thrombocytopenia); y antibody antiplatelet AND HIV (OR Measles, OR Dengue, OR Chickenpox OR varicella, OR Epstein Barr, OR Mumps, OR Rubella”. Se obtuvieron 218 referencias, de las cuales, 65 correspondían al objetivo de la revisión. Resultados. En la búsqueda se encontró que la trombocitopenia mediada por anticuerpos antiplaquetarios se ha documentado en infecciones virales por VIH, sarampión, dengue, varicela-zóster, Epstein-Barr, parotiditis y rubéola. La presencia de anticuerpos antiplaquetarios en infecciones virales por VIH, virus de Epstein-Barr y dengue, se ha asociado con la presencia de la trombocitopenia y con la gravedad de la enfermedad. Conclusiones. Aunque la aparición de anticuerpos antiplaquetarios no se considera el único mecanismo que explica la trombocitopenia desarrollada en las infecciones virales mencionadas, de acuerdo con la literatura científica disponible, su presencia se asocia con la gravedad de la trombocitopenia y con potenciales implicaciones clínicas en los pacientes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Introduction. Thrombocytopenia is a frequent phenomenon in viral infections. Peripheral platelet destruction mediated by anti-platelet antibodies has been one of the proposed causal mechanisms. Objective. Results were collected and analyzed from published studies on associations of human viral infections on anti-platelet antibodies and total platelet counts. Materials and methods. A PubMed search was conducted using the following terms: Viral infection (OR Virus diseases) AND antiplatelet antibody (OR thrombocytopenia) AND HIV (OR measles OR dengue OR chickenpox OR varicella OR Epistein Barr OR mumps OR rubella). Two hundred eighteen reference hits were obtained, 65 of which were relevant to this review. Results. Antiplatelet antibody-mediated thrombocytopenia has been documented in cases of HIV, measles, dengue, chickenpox, Epstein-Barr, mumps and rubella. Moreover, the presence of these antibodies has been associated with severity the disease and thrombocytopenia in viral infections. Conclusions. Although the presence of antiplatelet antibodies was not the only mechanism for explaining the thrombocytopenia developed in these viral infections, their presence was associated with severity of thrombocytopenia and with the clinical presentation of these patients.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[virosis]]></kwd>
<kwd lng="es"><![CDATA[anticuerpos]]></kwd>
<kwd lng="es"><![CDATA[plaquetas]]></kwd>
<kwd lng="es"><![CDATA[trombocitopenia]]></kwd>
<kwd lng="es"><![CDATA[humanos]]></kwd>
<kwd lng="en"><![CDATA[Virus diseases]]></kwd>
<kwd lng="en"><![CDATA[antibodies]]></kwd>
<kwd lng="en"><![CDATA[blood platelets]]></kwd>
<kwd lng="en"><![CDATA[thrombocytopenia]]></kwd>
<kwd lng="en"><![CDATA[humans]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p>ART&Iacute;CULO ORIGINAL</p>      <p><font size="4">    <center><b>Papel de los anticuerpos antiplaquetarios en la infecci&oacute;n viral: una revisi&oacute;n sistem&aacute;tica de la literatura </b></center></font></p>      <p>    <center>Yenny M. Montenegro-Medina, Luz A&iacute;da Rey-Caro, Jurg Niederbacher, Ruth Aral&iacute; Mart&iacute;nez-Vega, Fredi Alexander D&iacute;az-Quijano, Luis &aacute;ngel Villar-Centeno</center></p>      <p>Grupo de Epidemiolog&iacute;a Cl&iacute;nica, Universidad Industrial de Santander, Bucaramanga, Colombia</p>      <p>Recibido: 28/04/10; aceptado:25/09/10</p>  <hr size="1">      <p><b>Introducci&oacute;n.</b> La trombocitopenia es un fen&oacute;meno frecuente en las infecciones virales. Uno de los mecanismos propuesto como posible explicaci&oacute;n de su desarrollo es la destrucci&oacute;n plaquetaria perif&eacute;rica mediada por anticuerpos antiplaquetarios.</p>      <p><b>Objetivo.</b> Revisar los resultados de los trabajos originales que existen en la literatura sobre infecci&oacute;n viral y anticuerpos antiplaquetarios en humanos, y su efecto sobre el recuento total de plaquetas.</p>      ]]></body>
<body><![CDATA[<p><b>Materiales y m&eacute;todos.</b> Se hizo una b&uacute;squeda en PubMed empleando la combinaci&oacute;n de t&eacute;rminos: &rdquo;viral infection (OR Virus diseases) AND antibody antiplatelet (OR thrombocytopenia); y antibody antiplatelet AND HIV (OR Measles, OR Dengue, OR Chickenpox OR varicella, OR Epstein Barr, OR Mumps, OR Rubella&rdquo;. Se obtuvieron 218 referencias, de las cuales, 65 correspond&iacute;an al objetivo de la revisi&oacute;n.</p>      <p><b>Resultados.</b> En la b&uacute;squeda se encontr&oacute; que la trombocitopenia mediada por anticuerpos antiplaquetarios se ha documentado en infecciones virales por VIH, sarampi&oacute;n, dengue, varicela-z&oacute;ster, Epstein-Barr, parotiditis y rub&eacute;ola. La presencia de anticuerpos antiplaquetarios en infecciones virales por VIH, virus de Epstein-Barr y dengue, se ha asociado con la presencia de la trombocitopenia y con la gravedad de la enfermedad.</p>      <p><b>Conclusiones.</b> Aunque la aparici&oacute;n de anticuerpos antiplaquetarios no se considera el &uacute;nico mecanismo que explica la trombocitopenia desarrollada en las infecciones virales mencionadas, de acuerdo con la literatura cient&iacute;fica disponible, su presencia se asocia con la gravedad de la trombocitopenia y con potenciales implicaciones cl&iacute;nicas en los pacientes.</p>      <p><b>Palabras clave:</b> virosis, anticuerpos, plaquetas, trombocitopenia, humanos. </p>  <hr size="1">      <p><font size="3"><b>Roll of antibodies antiplatelets in viral infection: a systematic review of literature</b></font></p>      <p><b>Introduction. </b>Thrombocytopenia is a frequent phenomenon in viral infections. Peripheral platelet destruction mediated by anti-platelet antibodies has been one of the proposed causal mechanisms.</p>      <p><b>Objective. </b>Results were collected and analyzed from published studies on associations of human viral infections on anti-platelet antibodies and total platelet counts.</p>      <p><b>Materials and methods. </b>A PubMed search was conducted using the following terms: Viral infection (OR Virus diseases) AND antiplatelet antibody (OR thrombocytopenia) AND HIV (OR measles OR dengue OR chickenpox OR varicella OR Epistein Barr OR mumps OR rubella). Two hundred eighteen reference hits were obtained, 65 of which were relevant to this review.</p>      <p><b>Results. </b>Antiplatelet antibody-mediated thrombocytopenia has been documented in cases of HIV, measles, dengue, chickenpox, Epstein-Barr, mumps and rubella. Moreover, the presence of these antibodies has been associated with severity the disease and thrombocytopenia in viral infections.</p>      <p><b>Conclusions. </b>Although the presence of antiplatelet antibodies was not the only mechanism for explaining the thrombocytopenia developed in these viral infections, their presence was associated with severity of thrombocytopenia and with the clinical presentation of these patients.</p>      ]]></body>
<body><![CDATA[<p><b>Key words: </b>Virus diseases, antibodies, blood platelets, thrombocytopenia, humans.</p>  <hr size="1">      <p>La trombocitopenia es un fen&oacute;meno com&uacute;n en las infecciones virales. Sin embargo, su frecuencia real en estas enfermedades a&uacute;n no se ha establecido, debido a que habitualmente es de grado moderado y no presenta rasgos cl&iacute;nicos relevantes. De hecho, puede aparecer inesperadamente durante el estudio de un hemograma. Por todo esto, su presentaci&oacute;n puede ser impredecible y su incidencia dif&iacute;cil de estimar. Sin embargo, en algunas enfermedades, como el dengue, la trombocitopenia es un signo de importancia cl&iacute;nica y un criterio para clasificar la gravedad de la enfermedad (1-4).</p>      <p>Varios son los mecanismos patog&eacute;nicos que se han propuesto con el fin de explicar la trombocitopenia en la infecci&oacute;n viral; entre ellos est&aacute;n: </p>      <p>1) la supresi&oacute;n de los precursores megacarioc&iacute;ticos por acci&oacute;n directa del virus,</p>      <p>2) el excesivo consumo de plaquetas por da&ntilde;o de las c&eacute;lulas endoteliales, que favorece su adhesi&oacute;n y agregaci&oacute;n, </p>      <p>3) la disminuci&oacute;n o ausencia de producci&oacute;n de trombopoyetina como resultado del compromiso hep&aacute;tico ocasionado por virus hepatotr&oacute;picos, y </p>      <p>4) la destrucci&oacute;n plaquetaria perif&eacute;rica. </p>      <p>Este &uacute;ltimo mecanismo puede originarse, ya sea, por da&ntilde;o de las plaquetas debido a la acci&oacute;n directa del virus, por dep&oacute;sito inespec&iacute;fico de complejos inmunes sobre la superficie de las plaquetas circulantes, que conduce a su opsonizaci&oacute;n y lisis por el sistema reticuloendotelial, o por destrucci&oacute;n mediada por anticuerpos antiplaquetarios (1-5).</p>      <p>Aunque existen hallazgos que respaldan cada una de estas hip&oacute;tesis, es de nuestro inter&eacute;s revisar y evaluar la informaci&oacute;n disponible sobre la presencia de anticuerpos espec&iacute;ficos contra las plaquetas en la infecci&oacute;n viral, y su efecto sobre el recuento plaquetario, con el fin de tratar de esclarecer su implicaci&oacute;n en el desarrollo de estas trombocitopenias y de considerar su potencial uso como marcador pron&oacute;stico en enfermedades como el dengue.</p>      <p>Los primeros ant&iacute;genos plaquetarios se identificaron en la d&eacute;cada de 1950. Desde entonces, los avances en el campo de la biolog&iacute;a molecular y en las t&eacute;cnicas de obtenci&oacute;n de anticuerpos monoclonales han mejorado la caracterizaci&oacute;n de los mismos, permitiendo clasificarlos en aloant&iacute;genos o ant&iacute;genos comunes, ant&iacute;genos espec&iacute;ficos y criptoant&iacute;genos (6-8).</p>      ]]></body>
<body><![CDATA[<p>Losaloant&iacute;genos son mol&eacute;culas que se encuentran tanto en las plaquetas como en otras c&eacute;lulas y fluidos humanos. Entre estos se destacan el complejo mayor de histocompatibilidad de clase I (CMH-I), los receptores de la fracci&oacute;n constante (Fc) de las inmunoglobulinas, los ant&iacute;genos del sistema ABO/H y el sistema Lewis, entre otros (8-11). Los ant&iacute;genos espec&iacute;ficos, conocidos tambi&eacute;n como ant&iacute;genos plaquetarios humanos, como su nombre lo indica, son exclusivos de las plaquetas y se agrupan en 13 sistemas enumerados por orden de aparici&oacute;n (APH1-APH13). La mayor&iacute;a se encuentran localizados en las glucoprote&iacute;nas IIb/IIIa, Ib/IX/V y Ia/IIa, y por lo general, son bial&eacute;licos (9-11).</p>      <p>Los criptoant&iacute;genos o ant&iacute;genos cr&iacute;pticos son determinantes antig&eacute;nicos que habitualmente no est&aacute;n en contacto con el espacio extracelular; sin embargo, cuando ocurren cambios en la configuraci&oacute;n de la membrana plaquetaria, estos ant&iacute;genos quedan al descubierto y pueden ser reconocidos por sus anticuerpos espec&iacute;ficos. Algunos est&iacute;mulos asociados con la exposici&oacute;n de estos ant&iacute;genos son: la respuesta inflamatoria local, al estimular la respuesta por los linfocitos T, y el contacto con algunas sustancias ex&oacute;genas, como el EDTA; esta sustancia, al secuestrar el calcio, produce modificaciones en la configuraci&oacute;n de la glucoprote&iacute;na IIb/IIIa, lo que permite la expresi&oacute;n en la superficie de ep&iacute;topos escondidos, los cuales son reconocidos por anticuerpos espec&iacute;ficos, conocidos, en este caso, como anticuerpos dependientes de EDTA (8-10).</p>      <p>Junto con el descubrimiento de los ant&iacute;genos plaquetarios, surge el estudio de los mecanismos involucrados en el desarrollo de la trombocitopenia. Es, entonces, cuando se reconoce y se documenta la naturaleza autoinmune de esta alteraci&oacute;n, en la que se observa destrucci&oacute;n excesiva de las plaquetas mediada por autoanticuerpos contra ant&iacute;genos presentes en la superficie plaquetaria, que inducen la eliminaci&oacute;n de las plaquetas por los macr&oacute;fagos del h&iacute;gado y del bazo, contribuyendo as&iacute; a la trombocitopenia (2,6,10). </p>      <p>Existen dos tipos de anticuerpos antiplaquetarios: los aloanticuerpos y los autoanticuerpos.</p>      <p>Los aloanticuerpos se producen contra aloant&iacute;genos espec&iacute;ficos despu&eacute;s de un est&iacute;mulo antig&eacute;nico extra&ntilde;o, ya sea por transfusi&oacute;n, trasplante o embarazo; suelen ser de tipo IgG y son los responsables de enfermedades como la p&uacute;rpura posterior a una transfusi&oacute;n, la trombocitopenia aloinmunitaria pasiva posterior a una transfusi&oacute;n, la trombocitopenia aloinmune asociada con trasplantes, la falta de respuesta a la transfusi&oacute;n de plaquetas y la trombocitopenia neonatal aloinmune, entre otras (12-14). </p>      <p>Los autoanticuerpos se producen como consecuencia de la alteraci&oacute;n de la regulaci&oacute;n del sistema inmunol&oacute;gico, debida a la p&eacute;rdida de tolerancia inmunol&oacute;gica, por predisposici&oacute;n gen&eacute;tica del individuo, por ciertos factores ambientales como las infecciones o por ambas cosas. Este tipo de anticuerpos son los responsables de la p&uacute;rpura trombocitop&eacute;nica inmunitaria o p&uacute;rpura trombocitop&eacute;nica idiop&aacute;tica. Sin embargo, contrario a los aloanticuerpos, los autoanticuerpos suelen estar dirigidos contra las glucoprote&iacute;nas completas y no contra aloant&iacute;genos espec&iacute;ficos. Estos anticuerpos pueden ser tanto de tipo IgM como IgG, dependiendo de la enfermedad con la cual se encuentren asociados (12-14).</p>      <p>A continuaci&oacute;n, presentamos los hallazgos de estudios en infecciones virales que eval&uacute;an la asociaci&oacute;n entre la presencia de anticuerpos antiplaquetarios en humanos y su efecto sobre el recuento total de plaquetas, ya que &eacute;ste es uno de los principales marcadores de gravedad de muchas enfermedades originadas por virus y en la mayor&iacute;a de ellas a&uacute;n no se ha definido la causa de la trombocitopenia. </p>      <p><b>Materiales y m&eacute;todos</b></p>      <p><b><i>B&uacute;squeda</i></b></p>      <p>Para la revisi&oacute;n se realiz&oacute; una b&uacute;squeda en PubMed (actualizada hasta el 30 de agosto de 2010), empleando la siguiente combinaci&oacute;n de t&eacute;rminos: viral infection AND antibody antiplatelet (OR thrombocytopenia); y antibody antiplatelet AND HIV (OR Measles, OR Dengue, OR Chickenpox OR Varicella, OR Epstein Barr, OR Mumps, OR Rubella). Se obtuvieron 218 referencias, de las cuales, 117 no correspond&iacute;an al objetivo de la revisi&oacute;n (32 de tratamiento, 18 de estandarizaci&oacute;n o desarrollo de t&eacute;cnicas de laboratorio, 56 por &eacute;nfasis en otro tipo de enfermedades y 11 sobre expresiones de un gen u homolog&iacute;a gen&eacute;tica). </p>      ]]></body>
<body><![CDATA[<p>Se excluyeron los art&iacute;culos que no hac&iacute;an referencia al papel de los anticuerpos antiplaquetarios en el desarrollo de la trombocitopenia, no presentaban datos originales, estudios sobre infecciones virales poco frecuentes en los cuales no se encontr&oacute; informaci&oacute;n suficiente para establecer un criterio sobre la implicaci&oacute;n del agente con el desarrollo de anticuerpos antiplaquetarios o presencia de trombocitopenia, y los estudios que evaluaban el papel de las vacunas virales y su relaci&oacute;n con trombocitopenia asociada a anticuerpos anti-plaquetarios. Luego de estas exclusiones, quedaron 65 referencias cuyos principales resultados son presentados a continuaci&oacute;n.</p>      <p><b>Resultados</b> </p>      <p>M&uacute;ltiples infecciones de tipo viral se han asociado a trombocitopenia mediada por anticuerpos, como se mencion&oacute; anteriormente. A continuaci&oacute;n se aborda el tema, agrupando los art&iacute;culos encontrados de acuerdo con el agente causal en: virus de Epstein-Barr, hepatitis viral, virus de inmunodeficiencia humana (VIH), virus de la varicela-z&oacute;ster, virus del sarampi&oacute;n y la rub&eacute;ola, y virus del dengue(<a href="#cuadro1">cuadro 1</a>).</p>       <p>    <center><a name="cuadro1"><img src="img/revistas/bio/v31n1/1a06t1.gif"></a></center></p>      <p><b><i>Virus de Epstein-Barr </i></b></p>      <p>Aunque la infecci&oacute;n aguda por el virus de Epstein-Barr (VEB) es generalmente benigna y autolimitada, la trombocitopenia leve (100.000-150.000 plaquetas/mm3) se ha convertido en una complicaci&oacute;n frecuente (50 % de los casos) que puede progresar hasta el desarrollo de trombocitopenia grave (=25.000/mm3) acompa&ntilde;ada de cuadros de p&uacute;rpura potencialmente serios en 3 a 5 % de los pacientes (15-17). Varios estudios han evaluado la presencia de anticuerpos antipla-quetarios en pacientes con infecci&oacute;n por VEB y trombocitopenia grave, y han hallado una frecuencia entre 33,3 % y 41,2 % de anticuerpos IgM e IgG, los cuales se dirigen especialmente contra las glucoprote&iacute;nas plaquetarias IIb/IIIa, Ib/IX o ambas (15-18).</p>      <p>Debido a que la mayor&iacute;a de pacientes con infecci&oacute;n por VEB y trombocitopenia grave no tienen esplenomegalia (un signo secundario al aumento de la fagocitosis mediada por los macr&oacute;fagos del bazo que busca la eliminaci&oacute;n del virus), y presentan un n&uacute;mero normal de c&eacute;lulas en la m&eacute;dula &oacute;sea (que descarta una acci&oacute;n del virus sobre los precursores megacarioc&iacute;ticos), es factible considerar que la trombocitopenia desarrollada en estos pacientes es de tipo perif&eacute;rico.</p>      <p>Adem&aacute;s, la presencia de anticuerpos antiplaquetarios espec&iacute;ficos en casos de infecci&oacute;n por VEB, sugiere que la trombocitopenia observada est&aacute; relacionada principalmente con la presencia de los mismos, m&aacute;s que con la acci&oacute;n directa del virus. Un mecanismo que podr&iacute;a explicar el desarrollo de estos autoanticuerpos, es la p&eacute;rdida transitoria de tolerancia inmunol&oacute;gica perif&eacute;rica, que conducir&iacute;a a la formaci&oacute;n de anticuerpos autorreactivos, los cuales reaccionar&iacute;an contra las plaquetas de estos individuos. Esta teor&iacute;a explicar&iacute;a los hallazgos mencionados anteriormente (15-18).</p>      <p><b><i>Hepatitis viral</i></b></p>      ]]></body>
<body><![CDATA[<p>Las hepatitis virales conforman un grupo de enfermedades causadas por un amplio espectro de agentes etiol&oacute;gicos. Entre ellos se encuentran los virus de la hepatitis A (VHA), B (VHB), C (VHC), D (VHD) y E (VHE), los cuales se han asociado con manifestaciones de car&aacute;cter autoinmunitario, como la p&uacute;rpura trombocitop&eacute;nica en 6 a 8 % de los casos y algunos autores postulan como posible causa de esta p&uacute;rpura trombocitop&eacute;nica, la presencia de anticuerpos antiplaquetarios (19-30). </p>      <p>En un estudio realizado por Nagamine <i>et al</i>. (25), se detectaron t&iacute;tulos elevados de anticuerpos anti-APH tipo IgG, en 88,1 % y 47,1 % de los pacientes con hepatitis C y hepatitis B cr&oacute;nica, respectivamente, existiendo una relaci&oacute;n inversa entre los t&iacute;tulos de estos anticuerpos y el recuento de plaquetas. Estos hallazgos fueron ratificados por Aref <i>et al</i>. (28), quienes encontraron una alta frecuencia de inmunoglobulinas (IgG, IgM e IgA) asociadas a plaquetas (86,7 %) en pacientes trombocitop&eacute;nicos positivos para el VHC y con compromiso hep&aacute;tico. Adem&aacute;s, estos investigadores lograron determinar que la adherencia de estos anticuerpos a las plaquetas era de tipo espec&iacute;fico en el 86,7 % de los casos, y los blancos hacia los que se dirig&iacute;a la respuesta eran principalmente las glucoprote&iacute;nas de membrana plaquetaria IIb/IIIa (30 % de los casos), glucoprote&iacute;na IIIa (20,5 %), glucoprote&iacute;na IIb (13,3 %) y glucoprote&iacute;na Ia (10 %). Esto indicar&iacute;a que los anticuerpos antiplaquetarios tendr&iacute;an un papel importante en el desarrollo de los procesos trombocitop&eacute;nicos en los pacientes con infecci&oacute;n por el VHC y el VHB.</p>      <p>Aunque no se conocen los mecanismos involucrados en el desarrollo de estos anticuerpos antiplaquetarios, se ha observado que el VHC tiene capacidad de uni&oacute;n a las plaquetas, al igual que el VIH (24-27); esta caracter&iacute;stica del virus favorecer&iacute;a el desarrollo de nuevos ant&iacute;genos sobre la superficie de las plaquetas mediante la modificaci&oacute;n en la conformaci&oacute;n de las glucoprote&iacute;nas plaquetarias, lo cual propiciar&iacute;a el desarrollo de anticuerpos autorreactivos (25,26). Otros mecanismos inmunol&oacute;-gicos que podr&iacute;an estar involucrados en el desarrollo de esta p&uacute;rpura trombocitop&eacute;nica, son el dep&oacute;sito de complejos inmunes inespec&iacute;ficos en la superficie plaquetaria (19,31) o la presencia de anticuerpos anticardiolipina (32), lo cual nos demuestra el car&aacute;cter complejo de esta etiolog&iacute;a.</p>      <p><b><i>Virus de la inmunodeficiencia humana</i></b></p>      <p>La trombocitopenia moderada (30.000-100.000/mm3) es uno de los primeros trastornos hematol&oacute;gicos que aparece en la evoluci&oacute;n de la infecci&oacute;n con VIH-1 (33) y su prevalencia es de 2,8 a 15,5 %. Seg&uacute;n algunos estudios, esta trombocitopenia puede ser producida por la combinaci&oacute;n de todos los mecanismos patog&eacute;nicos de destrucci&oacute;n plaquetaria expuestos inicialmente (33,34).</p>      <p>La s&iacute;ntesis de anticuerpos antiplaquetarios en la infecci&oacute;n por VIH-1, se ha explicado por medio de dos mecanismos; el primero es la activaci&oacute;n policlonal de los linfocitos B por fallas del sistema inmunol&oacute;gico, que lleva a la producci&oacute;n de anticuerpos autorreactivos o autoanticuerpos (35-39), y la segunda explicaci&oacute;n es la capacidad del VIH de integrarse a las plaquetas y a precursores megacarioc&iacute;ticos (33,38), que inducir&iacute; a el desarrollo de nuevos ant&iacute;genos sobre la superficie de las plaquetas debido a la interacci&oacute;n de estructuras virales con estructuras plaquetarias, o modificar&iacute;a la conformaci&oacute;n de las glucoprote&iacute;nas presentes en su membrana (exposici&oacute;n de ant&iacute;genos plaquetarios cr&iacute;pticos). En ambos casos, el resultado ser&iacute;a la formaci&oacute;n de autoanticuerpos dirigidos contra estos nuevos ant&iacute;genos, seg&uacute;n lo planteado por Ballem <i>et al</i>. (38), lo cual conducir&iacute;a a un secuestro prematuro de las plaquetas mediado por el sistema fagoc&iacute;tico mononuclear y su posterior destrucci&oacute;n (<a href="#figura1">figura 1</a>) (33-35).</p>       <p>    <center><a name="figura1"><img src="img/revistas/bio/v31n1/1a06i1.jpg"></a></center></p>      <p>Los anticuerpos antiplaquetarios identificados en la infecci&oacute;n por VIH-1 son en su mayor&iacute;a de tipo IgG y poseen una gran afinidad contra la glucoprote&iacute;na plaquetaria IIIa, espec&iacute;ficamente contra los amino&aacute;cidos 49 a 66 (36). Actualmente, se conoce que estos anticuerpos contra los amino&aacute;cidos 49 a 66 de la glucoprote&iacute;na IIIa pueden estar presentes en pacientes VIH no trombocitop&eacute;nicos en estadios tempranos de la enfermedad; sin embargo, en estos casos se ha demostrado que estos anticuerpos poseen 26 a 35 veces menor reactividad (34,37). A pesar de esto, se plantea que podr&iacute;an utilizarse como un posible marcador de gravedad o progresi&oacute;n de la enfermedad.</p>      <p><b><i>Virus de la varicela-z&oacute;ster</i></b></p>      ]]></body>
<body><![CDATA[<p>La varicela se considera una enfermedad benigna y autolimitada en ni&ntilde;os saludables, aunque presenta un gran n&uacute;mero de complicaciones, entre ellas, la p&uacute;rpura trombocitop&eacute;nica (40-42). La trombocitopenia asociada a la varicela puede presentarse durante la fase vir&eacute;mica o posinfecciosa en 22,5 a 45 % de los casos (41,43,44). Sin embargo, no se han identificado marcadores predictores que puedan indicar si los pacientes tienen m&aacute;s probabilidades de desarrollar esta complicaci&oacute;n en la fase aguda o es una p&uacute;rpura trombocitop&eacute;nica posterior (45).</p>      <p>Existen varios estudios que han documentado la presencia de anticuerpos antiplaquetarios en infecci&oacute;n por el virus de la varicela-z&oacute;ster (VVZ), encontr&aacute;ndose que, en su mayor&iacute;a, estos son de tipo IgM y se dirigen contra las glucoprote&iacute;nas de superficie plaquetaria Ib, IIb, V y IIIa (46-50). Algunos autores plantean que la explicaci&oacute;n m&aacute;s probable de estos resultados es el desarrollo de un trastorno inmunol&oacute;gico heterog&eacute;neo transitorio, en el que varias de las glucoprote&iacute;nas presentes en la superficie de las plaquetas, pueden llegar a estimular la formaci&oacute;n de diferentes clases de anticuerpos. Este fen&oacute;meno puede deberse a la p&eacute;rdida de la regulaci&oacute;n que ejerce el sistema inmunol&oacute;gico sobre los clones de linfocitos autorreactivos presentes en sangre perif&eacute;rica. El tipo de respuesta inmunitaria desarrollada en estos casos y su especificidad depender&iacute;an, entonces, de las caracter&iacute;sticas inmunol&oacute;gicas y gen&eacute;ticas del individuo afectado (44-50).</p>      <p><b><i>Virus del dengue</i></b></p>      <p>Una de las principales manifestaciones cl&iacute;nicas del dengue es la trombocitopenia, que se encuentra asociada con la gravedad de la enfermedad (3-4,51-53). Los mecanismos involucrados en el desarrollo de la trombocitopenia en el dengue a&uacute;n no han sido dilucidados. Se han planteado muchas teor&iacute;as como: la disminuci&oacute;n en la s&iacute;ntesis de las plaquetas por acci&oacute;n directa del virus sobre los precursores megacarioc&iacute;ticos; la citotoxicidad directa del virus sobre las plaquetas; la destrucci&oacute;n plaquetaria debido a la uni&oacute;n de anticuerpos espec&iacute;ficos del dengue sobre la superficie de las plaquetas infectadas, o la presencia de anticuerpos antiplaquetarios generados como consecuencia de una respuesta inmun&oacute;lgica exagerada (53-61). </p>      <p>La presencia de anticuerpos antiplaquetarios en casos de infecci&oacute;n por dengue ha sido evaluada en varios estudios (54-62), los cuales han informado la presencia de autoanticuerpos tanto de tipo IgM (58) como de tipo IgG (61,62), sin diferenciar entre infecci&oacute;n primaria y secundaria. Sin embargo, se ha logrado evidenciar mayores niveles de anticuerpos antiplaquetarios en los pacientes con dengue hemorr&aacute;gico y s&iacute;ndrome de choque por dengue, que en pacientes con dengue cl&aacute;sico (58).</p>      <p>Aunque no se conoce con certeza el mecanismo que desencadena la formaci&oacute;n de estos anticuerpos. Existen algunas teor&iacute;as que intentan explicar su aparici&oacute;n. La primera es que algunos ep&iacute;topos antig&eacute;nicos del virus del dengue, como la prote&iacute;na NS1, inducen la formaci&oacute;n de anticuerpos con reactividad cruzada contra las plaquetas (62-64); otra es que la activaci&oacute;n policlonal de los linfocitos B conduce a la producci&oacute;n de anticuerpos heterot&iacute;picos capaces de reaccionar contra las plaquetas (57,61). Consideramos que estas dos posibilidades no son mutuamente excluyentes y podr&iacute;an participar de forma sin&eacute;rgica en la generaci&oacute;n de la trombocitopenia.</p>      <p><b><i>Otros virus</i></b></p>      <p>Otras infecciones virales en las que se ha documentado el desarrollo de p&uacute;rpura trombocitop&eacute;nica, son las infecciones por el virus del sarampi&oacute;n y el virus de la rub&eacute;ola. Esta complicaci&oacute;n se desarrolla en 1 de cada 3.000 casos de infecci&oacute;n por rub&eacute;ola y 1 de cada 6.000 casos de sarampi&oacute;n, aproximadamente (65). Sin embargo, tiende a pasar desapercibida, a menos que curse con manifestaciones evidentes de di&aacute;tesis hemorr&aacute;gica. Los mecanismos involucrados en el desarrollo de la trombocitopenia en estas infecciones, a&uacute;n no se han esclarecido y no existen datos que permitan establecer claramente el papel de los anticuerpos antiplaquetarios en el desarrollo de estas trombocitopenias.</p>      <p><b>Discusi&oacute;n</b></p>      <p>De acuerdo con lo demostrado por los diferentes estudios revisados, la presencia de anticuerpos antiplaquetarios ha sido documentada en la mayor&iacute;a de los procesos infecciosos expuestos. Si bien no existe un &uacute;nico mecanismo que explique la trombocitopenia desarrollada durante las infecciones virales, la gran frecuencia con la que se encuentran estos anticuerpos sugiere que hacen parte de un mecanismo central en la aparici&oacute;n de esta alteraci&oacute;n hematol&oacute;gica.</p>      ]]></body>
<body><![CDATA[<p>Diversos mecanismos se han propuesto con el fin de intentar explicar los fen&oacute;menos inmunol&oacute;gicos implicados en el desarrollo de anticuerpos anti-plaquetarios en las diferentes infecciones virales mencionadas. Entre ellos se destacan: la p&eacute;rdida de tolerancia perif&eacute;rica por un aumento de la estimulaci&oacute;n del sistema inmunol&oacute;gico debido al proceso infeccioso en curso, la inducci&oacute;n de ant&iacute;genos cr&iacute;pticos sobre la superficie de las plaquetas por acci&oacute;n directa del virus, y el mimetismo molecular entre estructuras propias del agente viral y las prote&iacute;nas de superficie de las plaquetas, que conduce a la producci&oacute;n de anticuerpos con reactividad cruzada.</p>      <p>Un hallazgo que llama la atenci&oacute;n es que, en la mayor&iacute;a de los estudios en los que se ha logrado establecer la presencia de anticuerpos antiplaquetarios, tambi&eacute;n se ha documentado que estos anticuerpos se dirigen de manera espec&iacute;fica contra ciertas glucoprote&iacute;nas presentes en la membrana de las plaquetas, como IIb, IIIa, Ib, V y Ia.</p>      <p>Si relacionamos estos hallazgos con el hecho de que todos los virus expuestos, que se han implicado con el desarrollo de autoanticuerpos, poseen envoltura, y que la constituci&oacute;n y propiedades inmunog&eacute;nicas de estas envolturas son similares a las de las glucoprote&iacute;nas de la membrana plaquetaria, es razonable pensar que el mimetismo molecular sea la mejor explicaci&oacute;n de la trombocitopenia en estos pacientes. Por esta raz&oacute;n, los niveles elevados de anticuerpos antiplaquetarios en estadios iniciales podr&iacute;an tener un potencial valor predictivo de gravedad en las enfermedades virales [Montenegro Y, Niederbacher J, Rey LA, Villar LA, Mart&iacute;nez R, D&iacute;az FA. Trombocitopenia mediada por anticuerpos en infecci&oacute;n por dengue como nuevo marcador de severidad. Biom&eacute;dica. 2009:29(Suppl.1):274].</p>      <p>En general, la calidad metodol&oacute;gica de los estudios considerados en la revisi&oacute;n es aceptable. Sin embargo, la mayor&iacute;a difieren entre s&iacute; en lo relacionado con el tipo de pacientes, el n&uacute;mero de sujetos incluidos (por lo general, se trabaj&oacute; con un n&uacute;mero reducido de casos), los esquemas terap&eacute;uticos y los contextos. Es por esto que, para evaluar la hip&oacute;tesis planteada, se requieren estudios de cohorte con tama&ntilde;os de muestra suficientes, con el fin de aportar un buen nivel de certeza cient&iacute;fica.</p>      <p>Aunque pueden existir otros estudios que no fueron captados en la b&uacute;squeda bajo los criterios utilizados, de acuerdo con la informaci&oacute;n encontrada, es posible concluir que en el desarrollo de trombocitopenia durante una infecci&oacute;n viral, si bien puede tener un origen multifactorial, la presencia de anticuerpos antiplaquetarios puede tener un papel clave en el complejo causal.</p>      <p>Esta l&iacute;nea de investigaci&oacute;n puede generar importantes aportes al manejo de las enfermedades virales. En este sentido, los anticuerpos anti-plaquetarios pueden ser un blanco terap&eacute;utico en la b&uacute;squeda de medicamentos para entidades como el dengue, en las que existe un n&uacute;mero reducido de opciones farmacol&oacute;gicas para el manejo de sus complicaciones (66).</p>      <p>Por otra parte, la detecci&oacute;n temprana de estos mediadores inmunol&oacute;gicos podr&iacute;a ayudar en el diagn&oacute;stico oportuno de enfermedades agudas y en la estimaci&oacute;n del pron&oacute;stico de infecciones cr&oacute;nicas, como las ocasionadas por los virus hepatotr&oacute;picos y por el VIH. Sin embargo, para todo esto se requieren m&aacute;s trabajos en los que se ubique adecuadamente el papel de estos anticuerpos en la cadena causal que conduce a la trombocitopenia y se determine la forma en que sus alteraciones pueden repercutir en las manifestaciones y el pron&oacute;stico de las enfermedades virales.</p>      <p><b>Conflicto de intereses</b></p>      <p>Los autores declaramos que no tenemos conflictos de inter&eacute;s.</p>      <p><b>Financiaci&oacute;n</b></p>      ]]></body>
<body><![CDATA[<p>Universidad Industrial de Santander-Vicerrector&iacute;a de Investigaci&oacute;n y Extensi&oacute;n, fondo 5647.</p>      <p>Correspondencia: Luis &Aacute;ngel Villar-Centeno, Centro de Investigaciones Epidemiol&oacute;gicas, Facultad de Salud, Universidad Industrial de Santander, Carrera 32 NÂº 29-31, oficina 304, La Aurora, Bucaramanga, Colombia. Tel&eacute;fono: (057) 634 4000, extensi&oacute;n 3204; fax: (057) 634 5781 <a href="mailto:luisangelvillarc@yahoo.com">luisangelvillarc@yahoo.com</a></p>   <b>Referencias </b> </p>      <!-- ref --><p>1. <b>Baroski B, Young N.</b> Hematologic consecuences of viral infestations. 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