<?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>0121-5256</journal-id>
<journal-title><![CDATA[Revista Med]]></journal-title>
<abbrev-journal-title><![CDATA[rev.fac.med]]></abbrev-journal-title>
<issn>0121-5256</issn>
<publisher>
<publisher-name><![CDATA[Universidad Militar Nueva Granada. Facultad de Medicina]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-52562012000100007</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[EL PAPEL DE LAS FRACCIONES LIPÍDICAS, LIPOPROTEÍNAS Y APOLIPOPROTEÍNAS EN PREECLAMPSIA]]></article-title>
<article-title xml:lang="en"><![CDATA[THE ROLE OF LIPID FRACTIONS, LIPOPROTEINS AND APOLIPOPROTEINS IN PREECLAMPSIA]]></article-title>
<article-title xml:lang="pt"><![CDATA[O PAPEL DAS FRAÇÕES LIPÍDICAS, LIPOPROTEÍNAS E APOLIPOPROTEÍNAS NA PREECLAMPSIA]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SERRANO DÍAZ]]></surname>
<given-names><![CDATA[NORMA CECILIA]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[ACEVEDO]]></surname>
<given-names><![CDATA[SANDRA MILENA]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[OTERO MOTTA]]></surname>
<given-names><![CDATA[MARÍA TERESA]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[COLMENARES MEJÍA]]></surname>
<given-names><![CDATA[CLAUDIA CAROLINA]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[SEPÚLVEDA JAIME]]></surname>
<given-names><![CDATA[MELISA TATIANA]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[FORERO GALVIS]]></surname>
<given-names><![CDATA[EDGAR HUMBERTO]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[RODRÍGUEZ ROCHA]]></surname>
<given-names><![CDATA[WISTON ALBERTO]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PÁEZ LEAL]]></surname>
<given-names><![CDATA[MARÍA CAROLINA]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A02">
<institution><![CDATA[,Universidad Autónoma de Bucaramanga Medicina Interna ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Clínica Carlos Ardila Lulle Servicio de Urgencias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad Autónoma de Bucaramanga Facultad de Ciencias de la Salud Programa de Medicina]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma de Bucaramanga Centro de Investigaciones Biomédicas ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2012</year>
</pub-date>
<volume>20</volume>
<numero>1</numero>
<fpage>62</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-52562012000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-52562012000100007&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-52562012000100007&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La Preeclampsia (PE) es un trastorno multisistémico, exclusivo de la gestación humana y responsable de aproximadamente 44.000 muertes maternas anuales a nivel mundial; esta enfermedad está asociada a múltiples complicaciones tanto en la madre como en el feto, sin embargo, su etiología no se encuentra totalmente dilucidada y en consecuencia ha sido difícil definir estrategias válidas de predicción. La PE es una enfermedad compleja y comparte diferentes factores de riesgo con las enfermedades cardiovasculares; como la obesidad, hipertensión arterial, resistencia a la insulina y dislipidemias. Con esto se evidencia que algunas alteraciones en los niveles lípidos y apolipoproteínas, se asocian con mayor peroxidación lipídica y estrés oxidativo lo cual puede desencadenar en disfunción endotelial para ambas patologías. Por tanto, la exploración de la evidencia de una asociación entre las fracciones lipídicas y riesgo de PE, puede aportar nuevo conocimiento en torno a la etiología de esta enfermedad. En la presente revisión, se plantearán las principales implicaciones biológicas de las alteraciones del perfil lipídico y apolipoproteínas en la génesis de la PE. Se describirán los estudios observacionales que se han aproximado a su evaluación y se identificarán sus principales debilidades metodológicas, con el fin de plantear estrategias para una evaluación integral de esta vía fisiopatológica, con posibles implicaciones predictivas de la enfermedad.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Preeclampsia (PE) is a multisystemic disorder unique to human pregnancy and responsible for about 44,000 maternal deaths worldwide. This disease is associated with multiple complications for both mother and fetus; however, its etiology is not totally clear and it has therefore been difficult to define valid prediction strategies. PE is a complex disease and it shares different risk factors with cardiovascular disease, such as obesity, hypertension, insulin resistance and dyslipidemia, evidencing that the presence of disturbances in lipid and apolipoprotein levels are associated with increased lipid peroxidation and oxidative stress which can lead to endothelial dysfunction in both diseases. Therefore, exploring the evidence of an association between lipid fractions and PE risk can provide new knowledge about the etiology of this disease. In this review, the major biological implications of lipid profile and apolipoproteins alterations in the genesis of PE will be presented, describing the observational studies and identifying its main methodological weaknesses in order to create strategies for comprehensive assessment of the pathophysiological pathway with potential predictive implications of the disease.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[A Preeclampsia (PE) é um transtorno multissistêmico, exclusivo da gestação humana e responsável por aproximadamente 44.000 mortes maternas anuais a nível mundial; esta doença esta associada a múltiplas complicações tanto na mãe como no feto, porém, sua etiologia não está totalmente esclarecida e consequentemente tem sido difícil definir estratégias válidas de predição. A PE é uma doença complexa e compartilha diferentes fatores de risco com as doenças cardiovasculares, como a obesidade, hipertensão arterial, resistência à insulina e dislipidemias; evidenciando que alterações nos níveis dos lipídios e apolipoproteínas, se associam com maior peroxidação lipídica e estresse oxidativo que pode desencadear disfunção endotelial para ambas patologias. Portanto, a exploração da evidência de uma associação entre las frações lipídicas e risco de PE, pode contribuir com novo conhecimento ao redor da etiologia desta doença. Na presente revisão, serão apresentadas as principais implicações biológicas das alterações do perfil lipídico e apolipoproteínas na gênese da PE, descrevendo os estudos observacionais que se aproximaram à sua avaliação e identificando suas principais fraquezas metodológicas, com o objetivo de propor estratégias para uma avaliação integral desta via fisiopatológica, com possíveis implicações preditivas da doença.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Preeclampsia]]></kwd>
<kwd lng="es"><![CDATA[dislipidemias]]></kwd>
<kwd lng="es"><![CDATA[apolipoproteínas]]></kwd>
<kwd lng="es"><![CDATA[peroxidación lipídica]]></kwd>
<kwd lng="es"><![CDATA[análisis de randomización mendeliana]]></kwd>
<kwd lng="en"><![CDATA[Preeclampsia]]></kwd>
<kwd lng="en"><![CDATA[Dyslipidemias]]></kwd>
<kwd lng="en"><![CDATA[apolipoproteins]]></kwd>
<kwd lng="en"><![CDATA[lipid peroxidation]]></kwd>
<kwd lng="en"><![CDATA[Mendelian Randomization Analysis]]></kwd>
<kwd lng="pt"><![CDATA[Preeclampsia]]></kwd>
<kwd lng="pt"><![CDATA[dislipidemias]]></kwd>
<kwd lng="pt"><![CDATA[apolipoproteínas]]></kwd>
<kwd lng="pt"><![CDATA[peroxidação lipídica]]></kwd>
<kwd lng="pt"><![CDATA[análise de randomização mendeliana]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">    <p align="right"><b>ART&Iacute;CULO ORIGINAL</b></p></font>     <p align="center"><font face="verdana" size="4"><b>EL PAPEL DE LAS FRACCIONES LIP&Iacute;DICAS, LIPOPROTE&Iacute;NAS Y APOLIPOPROTE&Iacute;NAS EN PREECLAMPSIA </b></font></p>     <p align="center"><font face="verdana" size="3"><b>THE ROLE OF LIPID FRACTIONS, LIPOPROTEINS AND APOLIPOPROTEINS IN PREECLAMPSIA </b></font></p>     <p align="center"><font face="verdana" size="3"><b>O PAPEL DAS FRA&Ccedil;&Otilde;ES LIP&Iacute;DICAS, LIPOPROTE&Iacute;NAS E APOLIPOPROTE&Iacute;NAS NA PREECLAMPSIA </b></font></p>  <font face="verdana" size="2">     <p align="center">NORMA CECILIA SERRANO D&Iacute;AZ, MD, MSC<SUP><B>a</B></SUP>, SANDRA MILENA ACEVEDO, MD<SUP><B>b</B></SUP>, MAR&Iacute;A TERESA OTERO MOTTA, MD<SUP><B>c</B></SUP>, CLAUDIA CAROLINA COLMENARES MEJ&Iacute;A, MD<SUP><B>a</B></SUP>, MELISA TATIANA SEP&Uacute;LVEDA JAIME<SUP><B>d</B></SUP> EDGAR HUMBERTO FORERO GALVIS<SUP><B>d</B></SUP> WISTON ALBERTO RODR&Iacute;GUEZ ROCHA<SUP><B>d</B></SUP>, MAR&Iacute;A CAROLINA P&Aacute;EZ LEAL, MD MSC<SUP><B>a</B></SUP> </p>     <p><sup><b>a</b></sup> Centro de Investigaciones Biom&eacute;dicas, Universidad Aut&oacute;noma de Bucaramanga, Bucaramanga, Colombia.    <br>   <sup><b>b</b></sup> Residente Primer A&ntilde;o, Medicina Interna UNAB.    <br> <sup><b>c</b></sup> Servicio de Urgencias. Cl&iacute;nica Carlos Ardila Lulle.    <br> <sup><b>d</b></sup> Estudiante programa de Medicina, Facultad de Ciencias de la Salud. Universidad Aut&oacute;noma de Bucaramanga.</p>     ]]></body>
<body><![CDATA[<p>* Correspondencia: Dra. P&aacute;ez, Centro de Investigaciones Biom&eacute;dicas UNAB. Calle 157 N&deg; 19  55 Ca&ntilde;averal Parque, Bucaramanga, Colombia. Email: <a href="mailto:mpaez@unab.edu.co"/a>mpaez@unab.edu.co</a>.  <hr>     <p><b>Resumen</b></p>     <p>La Preeclampsia (PE) es un trastorno multisist&eacute;mico, exclusivo de la gestaci&oacute;n humana y responsable de aproximadamente 44.000 muertes maternas anuales a nivel mundial; esta enfermedad est&aacute; asociada a m&uacute;ltiples complicaciones tanto en la madre como en el feto, sin embargo, su etiolog&iacute;a no se encuentra totalmente dilucidada y en consecuencia ha sido dif&iacute;cil definir estrategias v&aacute;lidas de predicci&oacute;n. La PE es una enfermedad compleja y comparte diferentes factores de riesgo con las enfermedades cardiovasculares; como la obesidad, hipertensi&oacute;n arterial, resistencia a la insulina y dislipidemias. Con esto se evidencia que algunas alteraciones en los niveles l&iacute;pidos y apolipoprote&iacute;nas, se asocian con mayor peroxidaci&oacute;n lip&iacute;dica y estr&eacute;s oxidativo lo cual puede desencadenar en disfunci&oacute;n endotelial para ambas patolog&iacute;as. Por tanto, la exploraci&oacute;n de la evidencia de una asociaci&oacute;n entre las fracciones lip&iacute;dicas y riesgo de PE, puede aportar nuevo conocimiento en torno a la etiolog&iacute;a de esta enfermedad. En la presente revisi&oacute;n, se plantear&aacute;n las principales implicaciones biol&oacute;gicas de las alteraciones del perfil lip&iacute;dico y apolipoprote&iacute;nas en la g&eacute;nesis de la PE. Se describir&aacute;n los estudios observacionales que se han aproximado a su evaluaci&oacute;n y se identificar&aacute;n sus principales debilidades metodol&oacute;gicas, con el fin de plantear estrategias para una evaluaci&oacute;n integral de esta v&iacute;a fisiopatol&oacute;gica, con posibles implicaciones predictivas de la enfermedad.</p>     <p><b>Palabras clave</b>: Preeclampsia, dislipidemias, apolipoprote&iacute;nas, peroxidaci&oacute;n lip&iacute;dica, an&aacute;lisis de randomizaci&oacute;n mendeliana.</p>   <hr>      <p><b>Abstract</b></p>       <p>Preeclampsia (PE) is a multisystemic disorder unique to human pregnancy and responsible for about 44,000 maternal deaths worldwide. This disease is associated with multiple complications for both mother and fetus; however, its etiology is not totally clear and it has therefore been difficult to define valid prediction strategies. PE is a complex disease and it shares different risk factors with cardiovascular disease, such as obesity, hypertension, insulin resistance and dyslipidemia, evidencing that the presence of disturbances in lipid and apolipoprotein levels are associated with increased lipid peroxidation and oxidative stress which can lead to endothelial dysfunction in both diseases. Therefore, exploring the evidence of an association between lipid fractions and PE risk can provide new knowledge about the etiology of this disease. In this review, the major biological implications of lipid profile and apolipoproteins alterations in the genesis of PE will be presented, describing the observational studies and identifying its main methodological weaknesses in order to create strategies for comprehensive assessment of the pathophysiological pathway with potential predictive implications of the disease.</p>     <p><b>Key words</b>: Preeclampsia, Dyslipidemias, apolipoproteins, lipid peroxidation, Mendelian Randomization Analysis.</p> <hr>      <p><b>Resumo</b></p>      <p>A Preeclampsia (PE) &eacute; um transtorno multissist&ecirc;mico, exclusivo da gesta&ccedil;&atilde;o humana e respons&aacute;vel por aproximadamente 44.000 mortes maternas anuais a n&iacute;vel mundial; esta doen&ccedil;a esta associada a m&uacute;ltiplas complica&ccedil;&otilde;es tanto na m&atilde;e como no feto, por&eacute;m, sua etiologia n&atilde;o est&aacute; totalmente esclarecida e consequentemente tem sido dif&iacute;cil definir estrat&eacute;gias v&aacute;lidas de predi&ccedil;&atilde;o. A PE &eacute; uma doen&ccedil;a complexa e compartilha diferentes fatores de risco com as doen&ccedil;as cardiovasculares, como a obesidade, hipertens&atilde;o arterial, resist&ecirc;ncia &agrave; insulina e dislipidemias; evidenciando que altera&ccedil;&otilde;es nos n&iacute;veis dos lip&iacute;dios e apolipoprote&iacute;nas, se associam com maior peroxida&ccedil;&atilde;o lip&iacute;dica e estresse oxidativo que pode desencadear disfun&ccedil;&atilde;o endotelial para ambas patologias. Portanto, a explora&ccedil;&atilde;o da evid&ecirc;ncia de uma associa&ccedil;&atilde;o entre las fra&ccedil;&otilde;es lip&iacute;dicas e risco de PE, pode contribuir com novo conhecimento ao redor da etiologia desta doen&ccedil;a. Na presente revis&atilde;o, ser&atilde;o apresentadas as principais implica&ccedil;&otilde;es biol&oacute;gicas das altera&ccedil;&otilde;es do perfil lip&iacute;dico e apolipoprote&iacute;nas na g&ecirc;nese da PE, descrevendo os estudos observacionais que se aproximaram &agrave; sua avalia&ccedil;&atilde;o e identificando suas principais fraquezas metodol&oacute;gicas, com o objetivo de propor estrat&eacute;gias para uma avalia&ccedil;&atilde;o integral desta via fisiopatol&oacute;gica, com poss&iacute;veis implica&ccedil;&otilde;es preditivas da doen&ccedil;a.</p>     <p><b>Palavraschave</b>: Preeclampsia, dislipidemias, apolipoprote&iacute;nas, peroxida&ccedil;&atilde;o lip&iacute;dica, an&aacute;lise de randomiza&ccedil;&atilde;o mendeliana.</p> <hr>     ]]></body>
<body><![CDATA[<p>La Preeclampsia (PE) es un trastorno multisist&eacute;mico exclusivo de la gestaci&oacute;n humana, con una incidencia global entreel 57% en todos los embarazos (1),y es responsable de aproximadamente 44.000 muertes maternas anuales en el mundo (2). En Colombia, la PE para el a&ntilde;o 2008 fue la primera causa de mortalidad materna, con una tasa estimada de 46 por cada 100.000 nacidos vivos (2). Si bien, en las &uacute;ltimas tres d&eacute;cadas se ha logrado disminuir el n&uacute;mero de muertes maternas por esta afecci&oacute;n, actualmente sigue representando un problema importante en salud p&uacute;blica, que afecta el binomio madrehijo. La PE causa m&uacute;ltiples complicaciones tanto en la madre como en el feto, lo cual ha generado un inter&eacute;s creciente en investigaci&oacute;n. Sin embargo, a&uacute;n se desconoce su etiolog&iacute;a y en consecuencia no ha sido f&aacute;cil definir estrategias v&aacute;lidas de predicci&oacute;n y manejo.</p>     <p>La PE comparte factores de riesgo convencionales con las Enfermedades Cardiovasculares (ECV), tales como, la obesidad, dislipidemias, hipertensi&oacute;n arterial y resistencia a la insulina (35). La base com&uacute;n a estos trastornos, es la presencia de disfunci&oacute;n endotelial, la cual se asocia con el desarrollo de vasoespasmo, aumento de la permeabilidad vascular y est&iacute;mulo de la agregaci&oacute;n plaquetaria (6), predisponiendo a disfunci&oacute;n placentaria y aterosclerosis, ambos hallazgos caracter&iacute;sticos de la PE y otras ECV.</p>     <p>Una de las v&iacute;as asociadas con la disfunci&oacute;n endotelial, se relaciona con la presencia de alteraciones en los niveles plasm&aacute;ticos de l&iacute;pidos y apolipoprote&iacute;nas, como fuente de peroxidaci&oacute;n lip&iacute;dica y estr&eacute;s oxidativo (7). Algunos estudios han realizado aproximaciones al respecto, describiendo en suero o placenta el incremento de los radicales libres de ox&iacute;geno y la disminuci&oacute;n de sustancias antioxidantes, que conlleva a un desequilibrio generador de da&ntilde;o permanente de la c&eacute;lula endotelial (8).Sin embargo, estos resultados parecen no ser concluyentes y su implicaci&oacute;n directa no ha sido claramente definida. En la presente revisi&oacute;n, se plantear&aacute;n las principales implicaciones biol&oacute;gicas de las alteraciones del perfil lip&iacute;dico y apolipoprote&iacute;nas en la g&eacute;nesis de la PE, describiendo estudios observacionales que se han aproximado a su evaluaci&oacute;n e identificando sus principales debilidades metodol&oacute;gicas, con el objetivo de plantear estrategias para una evaluaci&oacute;n integral de esta v&iacute;a fisiopatol&oacute;gica, con posibles implicaciones predictivas.</p>     <p><b>Preeclampsia como Enfermedad Cardiovascular: alteraciones en las fracciones lip&iacute;dicas y apolipoprote&iacute;nas como una v&iacute;a fisiopatol&oacute;gica com&uacute;n</b></p>     <p>La PE se caracteriza por una respuesta vascular anormal a la placentaci&oacute;n, la cual produce una respuesta sist&eacute;mica dada por un incremento en la resistencia vascular perif&eacute;rica, activaci&oacute;n del sistema de la coagulaci&oacute;n, aumento de la agregaci&oacute;n plaquetaria, estr&eacute;s oxidativo, peroxidaci&oacute;n lip&iacute;dica, disfunci&oacute;n endotelial y producci&oacute;n anormal de factores de crecimiento vascular (9,10). Hallazgos similares, se encuentran en ECV, como enfermedad coronaria y cerebrovascular (11). Es por esto, que recientemente, ha venido emergiendo evidencia que sugiere a la PE como un desorden cardiovascular, que comparte muchos de los factores de riesgo convencionales ya definidos para las ECV, tales como presi&oacute;n arterial elevada, obesidad, resistencia a la insulina, sedentarismo y dislipidemia (12). Est&aacute; por evaluar si tambi&eacute;n comparten factores de riesgo no convencionales, gen&eacute;ticos, ya descritos para ambas condiciones.</p>     <p>La relaci&oacute;n entre las fracciones lip&iacute;dicas y el riesgo de ECV ha sido evaluada de forma robusta, especialmente el papel de los triglic&eacute;ridos, colesterol LDL y colesterol HDL (1315). El Prospective Studies Collaboration que incluy&oacute; datos individuales de 61 estudios prospectivos con cerca de 55.000 muertes de origen vascular, encontr&oacute; que una disminuci&oacute;n de 38.6 mg/dL de colesterol total, representaba una disminuci&oacute;n del riesgo de enfermedad isqu&eacute;mica card&iacute;aca en todos los grupos de edad evaluados. Sin embargo, se encontr&oacute; que la relaci&oacute;n colesterol total/ HDL es un 40% mejor predictor de muerte de origen coronario en relaci&oacute;n con valores aislados de HDL y dos veces m&aacute;s que el colesterol total (16).</p>     <p>Con base en estos resultados y tomando en cuenta las similitudes de la PE con los des&oacute;rdenes cardiovasculares, varios investigadores han desarrollado m&aacute;s de 25 estudios observacionales (rango de las muestras analizadas entre 7 a 173 casos), para evaluar el papel de los l&iacute;pidos en PE. En la <a href="img/revistas/med/v20n1/v20n1a07t01.jpg" target="_blank">Tabla 1</a>, se resumen los hallazgos de los principales estudios observacionales realizados en mujeres gestantes, los cuales son sugestivos de un incremento en el riesgo de la PE asociado con niveles elevados de colesterol LDL, triglic&eacute;ridos y bajos niveles de colesterol HDL. Algunos estudios reportan incremento en el riesgo de PE de hasta 3.6 veces en mujeres gestantes con niveles elevados de colesterol LDL y disminuci&oacute;n del colesterol HDL (1720).</p>     <p>La evidencia de una asociaci&oacute;n entre fracciones lip&iacute;dicas y riesgo de PE no solo proviene de estudios en mujeres gestantes (casos y controles o cohortes), tambi&eacute;n se observa cuando los niveles de l&iacute;pidos se cuantifican en mujeres antes del embarazo, como recientemente fue demostrado por Magnussen et al. en un estudio prospectivo en Noruega (45). Los investigadores evaluaron los niveles de las fracciones lip&iacute;dicas antes de la gestaci&oacute;n en 3.494 mujeres (133 casos incidentes de PE), y demostraron que niveles altos de Ctotal y de CLDL se asocian con un incremento en el riesgo de PE con un ORajustado de 2,1 (IC95% 1,2  3,8) y 2,4 (IC95% 1,3  4,3) respectivamente, efecto que al parecer es gradual y monot&oacute;nico. Por otra parte, no se encontr&oacute; relaci&oacute;n con bajos niveles de HDL y altos niveles de triacilgliceroles al realizar un ajuste por posibles variables de confusi&oacute;n. Sin embargo, se evidenci&oacute; una tendencia al incremento en el riesgo con un PE ORajustado 1,3 (IC95% 0,8  2,4) y 1,6 (IC95% 0,9  2,9), respectivamente (45).</p>     <p>En la misma v&iacute;a, las apolipoprote&iacute;nas intervienen en la uni&oacute;n de las lipoprote&iacute;nas a sus receptores celulares, facilitando su captaci&oacute;n. La Apolipoprote&iacute;na A (Apo A) es el principal componente polipept&iacute;dico de las HDL y tiene dos formas principales Apo AI, la cual constituye el 75% de la Apo A en las HDL, y la Apo AII, la cual constituye el 25% de las HDL. La Apo B, en cambio,es el principal componente de las LDL (80%) y del 40% de las VLDL.</p>     <p>Estudios observacionales postulan valores de referencia para Apo AI entre 115224 mg/dl y de ApoB entre 60130 mg/dL (46). Estos valores de referencia no se pueden extrapolar a las mujeres gestantes, quienes presentan cambios importantes en el metabolismo lip&iacute;dico y en particular las pacientes preecl&aacute;mpticas. Si tenemos en cuenta, que la PE es una Enfermedad Compleja, en la cual los factores gen&eacute;ticos interact&uacute;an de manera compleja con los factores medioambientales, es pertinente citar estudios que han evaluado la asociaci&oacute;n de las Apo en PE desde ambas perspectivas.</p>     ]]></body>
<body><![CDATA[<p>Al revisar los estudios observacionales que han evaluado Apo en PE, se encuentran 19 publicados (<a href="img/revistas/med/v20n1/v20n1a07t02.jpg" target="_blank">Tabla 2</a>). La mayor&iacute;a de los estudios fueron realizados en Europa (73,7%) y Asia (21,05%). No ha sido publicado a la fecha ning&uacute;n estudio conducido en Am&eacute;rica Latina y &Aacute;frica, a pesar de ser los continentes con mayor tasa de mortalidad materna asociada a trastornos hipertensivos. El 95% de los estudios eran de casos y controles, que inclu&iacute;an mujeres durante el tercer trimestre de gestaci&oacute;n con un tama&ntilde;o muestral promedio de 72 gestantes, 29,3 casos y 42 controles. Los marcadores evaluados con mayor frecuencia son Apo B (15 estudios) y Apo AI (14 estudios), encontr&aacute;ndose solo tres trabajos para Apo E, donde la literatura ha estado m&aacute;s dirigida a estudios de asociaci&oacute;n gen&eacute;tica.</p>     <p>Desde la perspectiva gen&eacute;tica el mejor modelo es la ApoE. Esta mol&eacute;cula, es un componente importante de las lipoprote&iacute;nas de muy baja densidad VLDL, encargada de modificar respuestas inflamatorias y retirar el exceso de colesterol de la circulaci&oacute;n, mediante la regulaci&oacute;n de la absorci&oacute;n de l&iacute;pidos en el h&iacute;gado (50). Su gen, APOE, ubicado en 19q13.2, tiene tres alelos comunes, que codifican para tres isoformas de ApoE en el plasma (ApoE2, ApoE3 y ApoE4), dos de las cuales (ApoE2 y ApoE4) han sido asociadas con niveles altos de triglic&eacute;ridos y VLDL. Por tanto, se postula que los polimorfismos del gen APOE est&aacute;n asociados a un incremento del riesgo de ECV y PE. Nagy et al., encontraron una frecuencia mayor del alelo ApoE2 en mujeres con PE que en controles, hallazgo que no ha sido reproducible (62,63).</p>     <p>A pesar de la evidencia sugestiva de una asociaci&oacute;n entre l&iacute;pidos, apolipoprote&iacute;nas y PE, esta evidencia proviene de estudios con un tama&ntilde;o de muestra peque&ntilde;o tanto para casos como para controles, y un an&aacute;lisis limitado de las posibles variables de confusi&oacute;n, condiciones que aumentan la posibilidad de generar asociaciones espurias, sesgos o falso positivos como posibles explicaciones de estos resultados y su falta de reproducibilidad. Adicionalmente, la gran mayor&iacute;a de los estudios se han realizado en poblaci&oacute;n de origen cauc&aacute;sico, por lo tanto, queda sin resolver el interrogante s&iacute; esta asociaci&oacute;n tiene validez para poblaciones con diferente grado de mestizaje, como la colombiana.</p>     <p>    <center><a href="img/revistas/med/v20n1/v20n1a07t03.jpg" target="_blank">Tabla 3</a></center></p>     <p><b>Implicaciones biol&oacute;gicas de la dislipidemia y el estr&eacute;s oxidativo en Preeclampsia</b></p>     <p>La disfunci&oacute;n endotelial desempe&ntilde;a un papel importante en la patog&eacute;nesis de la PE, explicando las principales caracter&iacute;sticas cl&iacute;nicas de esta entidad, tales como la hipertensi&oacute;n arterial, proteinuria, edema y activaci&oacute;n de sistema de la coagulaci&oacute;n. Existen dos v&iacute;as que podr&iacute;an conducir a disfunci&oacute;n endotelial: la primera, por medio de sustancias que produce el tejido decidual y son liberadas hacia la circulaci&oacute;n materna. La segunda, la coexistencia de condiciones maternas que predispongan a su presentaci&oacute;n, como: hipertensi&oacute;n esencial, diabetes mellitus tipo 2, dislipidemia, resistencia a la insulina y adiposidad.</p>     <p>En el primer caso, factor decidual, se conoce que la transformaci&oacute;n limitada de las arterias espirales lleva a estr&eacute;s oxidativo en la circulaci&oacute;n uteroplacentaria, dando como resultado la producci&oacute;n de derivados de la oxidaci&oacute;n lip&iacute;dica, gener&aacute;ndose un desequilibrio entre pro y antioxidantes (64). Los l&iacute;pidos peroxidados, adem&aacute;s de generar da&ntilde;o local, se unen a las lipoprote&iacute;nas circulantes y son ampliamente distribuidos causando da&ntilde;o oxidativo sist&eacute;mico (65,66). Algunos autores sugieren que este estr&eacute;s oxidativo conlleva a la activaci&oacute;n de leucocitos maternos y posteriormente, activaci&oacute;n endotelial, ac&uacute;mulo de &aacute;cidos grasos y colesterol en la &iacute;ntima y, en general un desbalance oxidativo con las repercusiones claramente conocidasde este fen&oacute;meno (65).</p>     <p>Los &aacute;cidos grasos poliinsaturados interact&uacute;an con los radicales libres y son fuente de peroxidaci&oacute;n lip&iacute;dica en la placenta y el suero materno en gestantes con PE. Dichos l&iacute;pidos peroxidados producen efectos delet&eacute;reos sobre el endotelio in vitro y pueden producir disfunci&oacute;n endotelial, exacerbado por la reducci&oacute;n en la s&iacute;ntesis de prostaciclina. Los &aacute;cidos grasos inducen acumulaci&oacute;n de triglic&eacute;ridos en las c&eacute;lulas endoteliales cultivadas, y la resistencia a la insulina secundaria al da&ntilde;o endotelial, puede explicarse parcialmente por los niveles de triglic&eacute;ridos elevados (<a href="img/revistas/med/v20n1/v20n1a07f01.jpg" target="_blank">Figura 1</a>) (69).</p>     <p>En concordancia con lo descrito, las arterias espirales frecuentemente presentan dep&oacute;sitos de colesterol y fosfol&iacute;pidos, un fen&oacute;meno denominado 'aterosis aguda', y en la decidua de mujeres con PE adem&aacute;s muestra un alto contenido de l&iacute;pidos peroxidados y formas libres de isoprostano 8iso, marcador lip&iacute;dico de estr&eacute;s oxidativo (70). Por todo lo anterior, la decidua puede ser otra fuente de derivados de la peroxidaci&oacute;n lip&iacute;dica, que cuando alcanzan la circulaci&oacute;n sist&eacute;mica materna, inducen disfunci&oacute;n endotelial.</p>     ]]></body>
<body><![CDATA[<p>Un mecanismo potencial para la activaci&oacute;n endotelial vascular mediada por los productos de la peroxidaci&oacute;n lip&iacute;dica, est&aacute; relacionado con la activaci&oacute;n del factor nuclear de transcripci&oacute;n kappa B (NF kB, por sus siglas en ingl&eacute;s). Una vez activado el NF kB se une a los elementos cisreguladores del DNA e induce la expresi&oacute;n de varias citocinas pro inflamatorias como la prote&iacute;na quimiot&aacute;ctica de monocitos tipo 1 (MCP1) y la interleukina8 (IL8) y mol&eacute;culas de adhesi&oacute;n celular, como las ICAM1. La activaci&oacute;n de monocitos circulantes por parte de las citocinasproinflamatorias junto con la expresi&oacute;n endotelial creciente de ICAM1, da lugar a la activaci&oacute;n de numerosos macr&oacute;fagos asociados a lesiones ateroscler&oacute;ticas (69,70).</p>     <p>El embarazo normal se asocia a niveles elevados de especies reactivas de ox&iacute;geno y per&oacute;xidos de los l&iacute;pidos a nivel placentario, sin embargo, mujeres condislipidemia, producen mayores niveles de per&oacute;xidos lip&iacute;dicos, haciendo que la capacidad de los sistemas antioxidantes de neutralizaci&oacute;n placentariase sature y se instaure un estado patol&oacute;gico de tensi&oacute;n oxidativa, similar al observado en gestantes con PE (71).</p>     <p><b>Las apolipoprote&iacute;nas son predictores m&aacute;s fuertes de riesgo cardiovascular, que la relaci&oacute;n LDL/HDL. Su papel en la Preeclampsia a&uacute;n est&aacute; por esclarecer</b></p>     <p>Evidencia derivada del estudio multicentrico INTERHEART (15.000 casos y 15.000 controles) ha sugerido que las Apo AI y B (y la relaci&oacute;n ApoB/Apo AI) tienen mayor efecto predictivo que las LDL para identificaci&oacute;n de individuos en alto riesgo de eventos vasculares (72).</p>     <p>Como se describi&oacute; anteriormente, las Apo tambi&eacute;n han sido implicadas en PE de una manera similar a la ECV, no obstante, el grado de evidencia no es tan fuerte como el observado con las fracciones lip&iacute;dicas, TGL, y LDL (19,20).</p>     <p>Desde la perspectiva de la prevenci&oacute;n primordial las variantes al&eacute;licas de APOE &quot;E2&quot; y &quot;E4&quot;, han sido fuertemente asociadas con un incremento en el riesgo de enfermedad coronaria (73). Se ha comprobado un claro efecto sobre los niveles de ApoE de una forma que reproduce la asociaci&oacute;n sobre riesgo coronario, evidencia que hace de la ApoE un excelente candidato a ser evaluado en PE.</p>     <p><b>Limitaciones de la evidencia sobre el posible papel causal de los l&iacute;pidos y apolipoprote&iacute;nas en Preeclampsia</b></p>     <p>A pesar del gran n&uacute;mero de estudios funcionales, desarrollados en animales de experimentaci&oacute;n o en modelos moleculares y de estudios observacionales que indican la presencia de una asociaci&oacute;n; el posible papel causal de los l&iacute;pidos y las apolipoprote&iacute;nas en PE, presenta importantes limitaciones que merecen ser descritas en detalle. Si la asociaci&oacute;n es real, tendr&iacute;a un gran impacto en t&eacute;rminos de salud p&uacute;blica s&iacute; consideramos la posibilidad de una intervenci&oacute;n terap&eacute;utica para reducir el riesgo de PE, y por ende su impacto en el binomio madrehijo. Las principales limitaciones que identificamos en los estudios observacionales son:</p>     <p>1. El reducido tama&ntilde;o de muestra (<a href="img/revistas/med/v20n1/v20n1a07t01.jpg" target="_blank">Tabla 1</a> y <a href="img/revistas/med/v20n1/v20n1a07t02.jpg" target="_blank">2</a>) de los estudios conducidos hasta el momento, en promedio 40 casos por estudio, lo cual podr&iacute;a significar que las diferencias en los niveles sean solo falsos positivos, por una probabilidad de error tipo I mayor a 5%, m&aacute;xime si se tiene en cuenta la baja reproducibilidad de estos resultados. </p>     <p>2. La presencia de sesgo de causalidad reversa, hace que la enfermedad desde sus estadios tempranos lleve a incrementos en los niveles de l&iacute;pidos y lipoprote&iacute;nas y conduzca a la presencia de asociaci&oacute;n de &eacute;stos con PE (74,75). Es decir, los niveles de l&iacute;pidos incrementados no ser&iacute;an la causa, sino una consecuencia de la PE, y la asociaci&oacute;n se deber&iacute;a a una inversi&oacute;n temporal de los sucesos, interpret&aacute;ndose el efecto como la causa.</p>     ]]></body>
<body><![CDATA[<p> 3. Debido a que las concentraciones de l&iacute;pidos, lipoprote&iacute;nas y apolipoprote&iacute;nas se correlacionan fuertemente con otros factores de riesgo para PE (v.g. obesidad, diabetes, hipertensi&oacute;n arterial y nutricionales) (72), se genera la posibilidad de una asociaci&oacute;n positiva de estos marcadores con PE debido a confusi&oacute;n residual (76). Esto es importante si se tiene en cuenta que en la mayor&iacute;a de los estudios, los ajustes por posibles variables de confusi&oacute;n son insuficientes.</p>     <p>4. La presencia de heterogeneidad cl&iacute;nica, representada por unos criterios definitorios de PE no unificados y en algunos reportes muy ambiguos, implicar&iacute;a el ingreso de &quot;casos&quot; de pacientes no diagnosticadas adecuadamente y generar&iacute;a diluci&oacute;n del efecto. De manera complementaria, la inadecuada selecci&oacute;n de controles, aumentan la probabilidad de generar asociaciones espurias.</p>     <p>5. Se ha detectado de manera sistem&aacute;tica un an&aacute;lisis estad&iacute;stico limitado, por una parte, debido a que los estudios observacionales, poseen poca claridad en los criterios de exclusi&oacute;n, que al no ser tan rigurosos, no controlan todas las variables dependientes. Y por otra parte, la realizaci&oacute;n de m&uacute;ltiples subgrupos de an&aacute;lisis, que aumenta significativamente el error tipo I y que amerita estrategias de an&aacute;lisis particulares, por ejemplo, corregir a trav&eacute;s de m&uacute;ltiples comparaciones, las cuales por lo general no son implementadas (77).</p>     <p><b>Randomizaci&oacute;n Mendeliana: estrategia alternativa para evaluar el papel causal de los l&iacute;pidos, lipoprote&iacute;nas y apolipoprote&iacute;nas en Preeclampsia. Aproximaci&oacute;n del Estudio GenPE</b></p>     <p>La randomizaci&oacute;n mendeliana aparece como una estrategia alternativa para controlar por la presencia de factores de confusi&oacute;n y sesgo de causalidad reversa. El objetivo, va dirigido a identificar una variante gen&eacute;tica que se asocie de forma consistente con diferencias en los fenotipos intermedios, para nuestro caso, con las concentraciones de circulantes l&iacute;pidos, o lipoprote&iacute;nas o apolipoprote&iacute;nas. Lo anterior se basa en la segunda Ley de Mendel, que implica que el heredar o no una variante gen&eacute;tica es un proceso aleatorio que ocurre al momento de la formaci&oacute;n del gameto, independiente de cualquier factor de confusi&oacute;n conocido o desconocido, esto es una perfecta equivalencia entre los estudios gen&eacute;ticos de asociaci&oacute;n de tama&ntilde;o adecuado y los ensayos cl&iacute;nicos controlados (78). Por lo tanto, si altas concentraciones de, por ejemplo, Apo Eson causal en el desarrollo de PE, el ser portador de un genotipo que expone a las mujeres a altas concentraciones de Apo E (M/M) a largo plazo y de manera constante, deber&iacute;a incrementar el riesgo de PE en una manera proporcional a las diferencias en los niveles de Apo E (&Delta;ApoEs) atribuibles a la presencia de dicho genotipo (<a href="img/revistas/med/v20n1/v20n1a07f02.jpg" target="_blank">Figura 2</a>). Esta relaci&oacute;n, deber&iacute;a estar en gran medida libre de confusi&oacute;n y de sesgo de causalidad reversa (79,80). A&uacute;n m&aacute;s, debido a que el genotipo es una caracter&iacute;stica fija en el tiempo, el sesgo de verificaci&oacute;n (recall bias) es eliminado (57) y el sesgo de la regresi&oacute;n de la diluci&oacute;n, es poco probable que ocurra; pues su presencia es resultado de errores de medici&oacute;n y variabilidad biol&oacute;gica de la exposici&oacute;n, que lleva a subestimar la asociaci&oacute;n entre un factor de riesgo y la enfermedad (81).</p>     <p>La estrategia de randomizaci&oacute;n mendeliana (82,83), se ha usado recientemente para estudiar el v&iacute;nculo entre homociste&iacute;na y ECV (84,85), as&iacute; como tambi&eacute;n para evaluar el efecto de la prote&iacute;na Creactiva en la enfermedad arterial coronaria y en la DMT2 (8688).</p>     <p>El estudio de casos y controles GenPE (Gen&eacute;tica y Preeclampsia), con cerca de 9.000 pacientes colombianas captadas desde el a&ntilde;o 2000 a la fecha (<a href="http://www.genpe.org/" target="_blank">http://www.genpe.org/</a>). &Eacute;ste se convierte en un escenario natural para evaluar por medio de randomizaci&oacute;n mendeliana el poder de asociaci&oacute;n entre las fracciones lip&iacute;dicas (colesterol total, colesterolno HDL), lipoprote&iacute;nas (LDL, HDL) y apolipoprote&iacute;nas (Apo AI, Apo B, Apo E) y PE, en nuestra poblaci&oacute;n. Para dar respuesta a esta hip&oacute;tesis, se ha realizado la cuantificaci&oacute;n de estos biomarcadores en 2.000 gestantes con PE y 2.000 controles, captados en Cartagena, Cali, Medell&iacute;n, Bogot&aacute; y Bucaramanga. Una vez se realicen estas cuantificaciones en la totalidad de la muestra seleccionada, los resultados ser&aacute;n usados en conjunto con los hallazgos del GWAS (por su siglas en ingles: GenomeWide Association Studies) adelantado por nuestro grupo (<a href="http://www.wtccc.org.uk/ccc2/projects/ccc2_pa.shtml" target="_blank">http://www.wtccc.org.uk/ccc2/projects/ccc2_pa.shtml</a>), para realizar el an&aacute;lisis de Randomizaci&oacute;n Mendeliana y determinar as&iacute;, el papel causal de las fracciones lip&iacute;dicas y apolipoprote&iacute;nas en PE.</p>     <p><b>Agradecimiento</b></p>     <p>Departamento Administrativo de Ciencia, Tecnolog&iacute;a e Innovaci&oacute;n (Colciencias, contrato: 5052009) y Universidad Aut&oacute;noma de Bucaramanga  UNAB (Proyecto EGEN52).</p> <hr>      <p><b>Referencias bibliogr&aacute;ficas</b></p>     ]]></body>
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