<?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>1688-0390</journal-id>
<journal-title><![CDATA[Revista Médica del Uruguay]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Méd. Urug.]]></abbrev-journal-title>
<issn>1688-0390</issn>
<publisher>
<publisher-name><![CDATA[Sindicato Médico del Uruguay]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1688-03902013000300002</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Polimorfismos de ApoE y daño vascular en diabéticos tipo 2]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guerra]]></surname>
<given-names><![CDATA[Anahí]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Raggio]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esperón]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fraga]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valiño]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pisano Sánchez]]></surname>
<given-names><![CDATA[Ariel]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pisano Rondeau]]></surname>
<given-names><![CDATA[Ariel]]></given-names>
</name>
<xref ref-type="aff" rid="A07"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[Rosario]]></given-names>
</name>
<xref ref-type="aff" rid="A08"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Borgia]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="A09"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schwedt]]></surname>
<given-names><![CDATA[Emma]]></given-names>
</name>
<xref ref-type="aff" rid="A10"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Belloso]]></surname>
<given-names><![CDATA[Adriana]]></given-names>
</name>
<xref ref-type="aff" rid="A11"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Stoll]]></surname>
<given-names><![CDATA[Mario]]></given-names>
</name>
<xref ref-type="aff" rid="A12"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Facultad de Medicina, Universidad de la República Clínica Médica Ex Postgrado]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Facultad de Medicina, Universidad de la República Departamento de Genética Profesor Agregado (orientación clínica]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A03">
<institution><![CDATA[,Comisión Honoraria para la Salud Cardiovascular Directora Técnica del Laboratorio de Genética Molecular Profesor Agregado (orientación clínica]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A04">
<institution><![CDATA[,Facultad de Medicina, Universidad de la República Clínica Médica Ex Asistente]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A05">
<institution><![CDATA[,Facultad de Medicina, Universidad de la República Clínica Médica Profesor Agregado]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A06">
<institution><![CDATA[,Facultad de Medicina, Universidad de la República Clínica Médica Ex Postgrado]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A07">
<institution><![CDATA[,Cooperativa Médica de Florida Médico ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A08">
<institution><![CDATA[,Facultad de Medicina, Universidad de la República Clínica Médica Profesora Agregada]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A09">
<institution><![CDATA[,Universidad de la República Licenciado en Ciencias Sociales Magíster en Sociología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A10">
<institution><![CDATA[,Universidad de la República Facultad de Medicina Cátedra de Nefrología]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A11">
<institution><![CDATA[,Facultad de Medicina, Universidad de la República Clínica Médica Ex Profesora Directora]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<aff id="A12">
<institution><![CDATA[,Comisión Honoraria para la Salud Cardiovascular Laboratorio de Genética Molecular Área de Genética Cardiovascular]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Uruguay</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2013</year>
</pub-date>
<volume>29</volume>
<numero>3</numero>
<fpage>137</fpage>
<lpage>146</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_arttext&amp;pid=S1688-03902013000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_abstract&amp;pid=S1688-03902013000300002&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.edu.uy/scielo.php?script=sci_pdf&amp;pid=S1688-03902013000300002&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Introducción: la apolipoproteína E (ApoE) es un constituyente de las lipoproteínas plasmáticas con un importante rol en el metabolismo como ligando de receptores de lipoproteínas. Las variaciones en el locus de ApoE se vinculan a variaciones en las concentraciones de lipoproteínas de baja densidad (LDL) plasmáticas. El alelo E4 se ha vinculado a aumento del riesgo cardiovascular, a progresión de la nefropatía diabética así como a severidad y progresión de neuropatía y retinopatía diabéticas. El alelo E2 se asocia a un efecto final protector para el desarrollo de enfermedad cardiovascular. Objetivos: estudiar la asociación entre este polimorfismo y las repercusiones macroangiopáticas, en especial cardiopatía isquémica, y el lipidograma en los pacientes diabéticos. Material y método: se estudiaron 78 pacientes diabéticos tipo 2, menores de 85 años de edad, valorando la asociación entre el polimorfismo de ApoE y las repercusiones macroangiopáticas y microangiopáticas de la diabetes, el lipidograma y la edad al diagnóstico de la diabetes. La determinación genotípica se realizó por métodos estándar de amplificación-restricción previo consentimiento informado. Las variables se analizaron utilizando chi cuadrado y prueba de Fisher. Error alfa menor a 0,05. Resultados: la frecuencia de portadores del alelo E4 de la Apo E entre los individuos con complicaciones macroangiopáticas (43,5%) fue mayor que entre los que estaban libres de estas complicaciones (26,2%), si bien las diferencias no fueron estadísticamente significativas. La presencia de cardiopatía isquémica se asoció en forma significativa con el alelo E4, 56% versus 25%. La presencia del alelo E4 se asoció significativamente con un diagnóstico de diabetes antes de los 40 años. Los pacientes con alelos de riesgo presentaron valores de LDL y triglicéridos (TG) aumentados. Conclusiones: el alelo E4 se asoció a un mayor riesgo de cardiopatía isquémica y una edad al diagnóstico de DM2 menor a 40 años. Se evidenció un efecto marcado del genotipo de ApoE sobre el perfil lipídico de los pacientes diabéticos tipo 2.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Introduction: apolipoproiten E (ApoE) is a constituent of plasma lipoproteins that plays an important role in metabolism acting as lipoprotein receptor ligand. Variations in the ApoE locus are associated to variations in concentration of low plasma density lipoproteins. Allele E4 has been associated to an increase of risk for cardiovascular disease, progress in diabetic nephropathies and severity and progression of diabetic neuropathies and retinopathies. Allele E2 is associated to conferring protection from coronary heart disease (CHD). Objectives: to study the association between this polymorphism and the macroangiopathic effects, especially in terms of ischemic cardiopathy, and lipidogram in diabetic patients. Method: 78 patients less than 85 years old with type 2 diabetes mellitus were studied, being the association between the ApoE polymorphism and the macroangiopathic and microangiopathic effects of diabetes assessed, as well as the lipidogram and age of patients at time of diagnosis. Genotype determination was done with standard extending-restricting methods following informed consent. Variables were analysed using Chi-scuared and the Fisher exact test. Alpha error rate was lower than 0.05. Results: frequency of carriers of ApoE allele E4 among individuals with macroangiopathic complications was larger than among those who were free of these complications (26.2%), although differences were not statistically significant. The presence of ischemic heart disease was significantly associated with E4 allele, that is 56% versus 25%. The presence of the E4 allele was significantly associated to the diagnosis of diabetes earlier than 40 years old. Patients with risk alleles evidenced increased values of LDL and triglycerides. Conclusions: allele E4 was associated with a larger risk for ischemic cardiopathy and age of diagnosing type 2 diabetes mellitus lower than 40 years old. The strong effect of genotype ApoE was evidence on the lipid profile of patients with type 2 diabetes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Introdução: a apolipoproteína E (ApoE) é um dos elementos das lipoproteínas plasmáticas e tem um papel importante no metabolismo como ligando dos receptores de lipoproteínas. As variações no lócus de ApoE estão vinculadas a variações nas concentrações de lipoproteínas plasmáticas de baixa densidade (LDL). O alelo E4 está vinculado a um aumento do risco cardiovascular, à progressão da nefropatia diabética como também à gravidade e a progressão de neuropatia e retinopatia diabéticas. O alelo E2 está associado a um efeito final protetor para o desenvolvimento de doença cardiovascular. Objetivos: estudar a associação entre este polimorfismo e as repercussões macroangiopáticas, especialmente cardiopatia isquêmica, e o lipidograma em pacientes diabéticos. Material e método: foram estudados 78 pacientes diabéticos tipo 2, com menos de 85 anos de idade, para avaliar a associação entre o polimorfismo de ApoE e as repercussões macroangiopáticas e microangiopáticas da diabetes, o lipidograma e a idade no momento do diagnóstico da diabetes. A determinação genotípica foi realizada por métodos padrões de amplificação-restrição, com consentimento informado dos pacientes. As variáveis foram analisadas utilizando chi quadrado e prova de Fisher. Erro alfa menor a 0,05. Resultados: a frequência de portadores do alelo E4 de la Apo E entre os indivíduos com complicações macroangiopáticas (43,5%) foi maior que entre aqueles que não apresentavam essas complicações (26,2%), embora as diferenças não tenham sido estatisticamente significativas. A presença de cardiopatia isquêmica foi associada significativamente com o alelo E4, 56% versus 25%. A presença do alelo E4 foi associado significativamente com diagnóstico de diabetes antes dos 40 anos. Os pacientes com alelos de risco apresentaram valores de LDL e triglicérides (TG) aumentados. Conclusões: o alelo E4 foi associado a um maior risco de cardiopatia isquêmica e idade no momento do diagnóstico de DM2 menor a 40 anos. Foi observado um efeito do genótipo de ApoE sobre o perfil lipídico dos pacientes diabéticos tipo 2.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[APOLIPOPROTEÍNA E4]]></kwd>
<kwd lng="es"><![CDATA[DIABETES MELLITUS TIPO 2]]></kwd>
<kwd lng="es"><![CDATA[ISQUEMIA MIOCARDICA]]></kwd>
<kwd lng="en"><![CDATA[APOLIPOPROTEIN E4]]></kwd>
<kwd lng="en"><![CDATA[DIABETES MELLITUS TYPE 2]]></kwd>
<kwd lng="en"><![CDATA[MYOCARDIAL ISCHEMIA]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p><b><font size="4" face="Verdana">Polimorfismos de ApoE y da&ntilde;o vascular  en diab&eacute;ticos tipo 2 </font></b>  </p>      <p><font size="2" face="Verdana">Dres. Anah&iacute; Guerra<a name="-S1"></a><a href="#S1">*</a>, V&iacute;ctor Raggio<a name="-S2"></a><a href="#S2">&dagger;</a>, Dra. Qu&iacute;m. Patricia Esper&oacute;n<a name="-S3"></a><a href="#S3">&Dagger;</a>, Dres. Laura Fraga<a name="-S4"></a><a href="#S4">&sect;</a>, Jos&eacute; Vali&ntilde;o<a name="-S5"></a><a href="#S5">&para;</a>, Ariel Pisano S&aacute;nchez<a name="-S6"></a><a href="#S6">**</a>, Ariel Pisano Rondeau<a name="-S7"></a><a href="#S7">&dagger;&dagger;</a>, Rosario Mart&iacute;nez<a name="-S8"></a><a href="#S8">&Dagger;&Dagger;</a>, Mag. Lic. Fernando Borgia<a name="-S9"></a><a href="#S9">&sect;&sect;</a>, Dres. Emma Schwedt<a name="-S10"></a><a href="#S10">&para;&para;</a>, Adriana Belloso<a name="-S11"></a><a href="#S11">***</a>, Mario Stoll<a name="-S12"></a><a href="#S12">&dagger;&dagger;&dagger;</a></font></p>      <strong>     <p><font face="Verdana" size="2">Resumen </font> </p>   </strong>     <p><font face="Verdana" size="2"><strong>Introducci&oacute;n:</strong> la apolipoprote&iacute;na E (ApoE) es un constituyente de las lipoprote&iacute;nas plasm&aacute;ticas con un importante rol en el metabolismo como ligando de receptores de lipoprote&iacute;nas. Las variaciones en el locus de ApoE se vinculan a variaciones en las concentraciones de lipoprote&iacute;nas de baja densidad (LDL) plasm&aacute;ticas. El alelo E4 se ha vinculado a aumento del riesgo cardiovascular, a progresi&oacute;n de la nefropat&iacute;a diab&eacute;tica as&iacute; como a severidad y progresi&oacute;n de neuropat&iacute;a y retinopat&iacute;a diab&eacute;ticas. El alelo E2 se asocia a un efecto final protector para el desarrollo de enfermedad cardiovascular. <strong>Objetivos:</strong> estudiar la asociaci&oacute;n entre este polimorfismo y las repercusiones macroangiop&aacute;ticas, en especial cardiopat&iacute;a isqu&eacute;mica, y el lipidograma en los pacientes diab&eacute;ticos. <strong>Material y m&eacute;todo:</strong> se estudiaron 78 pacientes diab&eacute;ticos tipo 2, menores de 85 a&ntilde;os de edad, valorando la asociaci&oacute;n entre el polimorfismo de ApoE y las repercusiones macroangiop&aacute;ticas y microangiop&aacute;ticas de la diabetes, el lipidograma y la edad al diagn&oacute;stico de la diabetes. La determinaci&oacute;n genot&iacute;pica se realiz&oacute; por m&eacute;todos est&aacute;ndar de amplificaci&oacute;n-restricci&oacute;n previo consentimiento informado. Las variables se analizaron utilizando chi cuadrado y prueba de Fisher. Error alfa menor a 0,05. <strong>Resultados:</strong> la frecuencia de portadores del alelo E4 de la Apo E entre los individuos con complicaciones macroangiop&aacute;ticas (43,5%) fue mayor que entre los que estaban libres de estas complicaciones (26,2%), si bien las diferencias no fueron estad&iacute;sticamente significativas. La presencia de cardiopat&iacute;a isqu&eacute;mica se asoci&oacute; en forma significativa con el alelo E4, 56% versus 25%. La presencia del alelo E4 se asoci&oacute; significativamente con un diagn&oacute;stico de diabetes antes de los 40 a&ntilde;os. Los pacientes con alelos de riesgo presentaron valores de LDL y triglic&eacute;ridos (TG) aumentados. <strong>Conclusiones:</strong> el alelo E4 se asoci&oacute; a un mayor riesgo de cardiopat&iacute;a isqu&eacute;mica y una edad al diagn&oacute;stico de DM2 menor a 40 a&ntilde;os. Se evidenci&oacute; un efecto marcado del genotipo de ApoE sobre el perfil lip&iacute;dico de los pacientes diab&eacute;ticos tipo 2.</font></p>       <p><font face="Verdana" size="2"><strong>Palabras clave:</strong>	APOLIPOPROTE&Iacute;NA E4  	DIABETES MELLITUS TIPO 2 - complicaciones   	ISQUEMIA MIOCARDICA</font></p>       <p><font face="Verdana" size="2"><strong>Key words:</strong>	APOLIPOPROTEIN E4  	DIABETES MELLITUS TYPE 2 - complications  	MYOCARDIAL ISCHEMIA</font></p>       <p><font size="2" face="Verdana"><a name="S1"></a><a href="#-S1">*</a> Especialista en Medicina Interna. Ex Postgrado de Cl&iacute;nica M&eacute;dica, Facultad de Medicina, Universidad de la Rep&uacute;blica. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S2"></a><a href="#-S2">&dagger;</a> Profesor Agregado (orientaci&oacute;n cl&iacute;nica), Departamento de Gen&eacute;tica, Facultad de Medicina, Universidad de la Rep&uacute;blica. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S3"></a><a href="#-S3">&Dagger;</a> Profesor Agregado Biolog&iacute;a Molecular, Facultad de Qu&iacute;mica, Universidad de la Rep&uacute;blica. Directora T&eacute;cnica del Laboratorio de Gen&eacute;tica Molecular de la Comisi&oacute;n Honoraria para la Salud Cardiovascular. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S4"></a><a href="#-S4">&sect;</a> Ex Asistente de Cl&iacute;nica M&eacute;dica, Facultad de Medicina, Universidad de la Rep&uacute;blica. Uruguay.</font></p>       ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana"><a name="S5"></a><a href="#-S5">&para;</a> Profesor Agregado de Cl&iacute;nica M&eacute;dica, Facultad de Medicina, Universidad de la Rep&uacute;blica. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S6"></a><a href="#-S6">**</a> Especialista en Medicina Interna. Ex Postgrado de Cl&iacute;nica M&eacute;dica, Facultad de Medicina, Universidad de la Rep&uacute;blica. Cooperativa M&eacute;dica de Florida. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S7"></a><a href="#-S7">&dagger;&dagger;</a> M&eacute;dico de Cooperativa M&eacute;dica de Florida. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S8"></a><a href="#-S8">&Dagger;&Dagger;</a> Profesora Agregada de Cl&iacute;nica M&eacute;dica, Facultad de Medicina, Universidad de la Rep&uacute;blica. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S9"></a><a href="#-S9">&sect;&sect;</a> Mag&iacute;ster en Sociolog&iacute;a. Licenciado en Ciencias Sociales. Universidad de la Rep&uacute;blica. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S10"></a><a href="#-S10">&para;&para;</a> Profesora Agregada de C&aacute;tedra de Nefrolog&iacute;a, Facultad de Medicina, Universidad de la Rep&uacute;blica. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S11"></a><a href="#-S11">***</a> Ex Profesora Directora de Cl&iacute;nica M&eacute;dica, Facultad de Medicina, Universidad de la Rep&uacute;blica. Uruguay.</font></p>       <p><font size="2" face="Verdana"><a name="S12"></a><a href="#-S12">&dagger;&dagger;&dagger;</a> Coordinador &Aacute;rea de Gen&eacute;tica Cardiovascular, Laboratorio de Gen&eacute;tica Molecular, Comisi&oacute;n Honoraria para la Salud Cardiovascular. Uruguay.</font></p>       <p><font size="2" face="Verdana">Correspondencia: Dra. Anah&iacute; Guerra. Mario Cassinoni 1440, Montevideo. Uruguay. Correo electr&oacute;nico: <a href="anahiguerra@gmail.com">anahiguerra@gmail.com</a></font></p>       <p><font size="2" face="Verdana">Recibido: 9/12/12 Aceptado: 6/5/13</font></p>       ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana">Conflicto de intereses: los autores del presente art&iacute;culo declaran que no existen conflictos de intereses.</font></p>    <strong>     <p><font face="Verdana" size="2">Introducci&oacute;n</font></p>   </strong>     <p><font face="Verdana" size="2">La diabetes mellitus (DM) es la afecci&oacute;n end&oacute;crino-metab&oacute;lica con mayor prevalencia a nivel mundial, correspondiendo m&aacute;s de 90% de los casos a diabetes tipo 2 (DM2). Estos pacientes presentan una morbimortalidad global y de causa cardiovascular (CV) dos a cuatro veces mayor que la poblaci&oacute;n general<a name="-bib1"></a>(<a href="#bib1"><sup>1</sup></a>).</font></p>       <p><font face="Verdana" size="2">Se ha intentado identificar factores de riesgo CV no tradicionales que expliquen la variabilidad interindividual en sujetos que expuestos a los factores de riesgo cl&aacute;sicos presentan, sin embargo, un perfil evolutivo diferente en relaci&oacute;n al da&ntilde;o en &oacute;rganos blanco. Estudios epidemiol&oacute;gicos y familiares han demostrado la influencia de factores hereditarios en la aparici&oacute;n y progresi&oacute;n de estas complicaciones(<a href="#bib2"><sup>2-5</sup></a>)<a name="-bib2"></a><a name="-bib3"></a><a name="-bib4"></a><a name="-bib5"></a>. En la &uacute;ltima d&eacute;cada la b&uacute;squeda de los determinantes gen&eacute;ticos del da&ntilde;o vascular en diab&eacute;ticos ha sido un &aacute;rea de intensa investigaci&oacute;n. As&iacute; se ha determinado la influencia de polimorfismos en varios genes en la aparici&oacute;n y progresi&oacute;n del da&ntilde;o en &oacute;rganos blanco en patolog&iacute;as cr&oacute;nicas como la DM(<a href="#bib6"><sup>6</sup></a>)<a name="-bib6"></a>.</font></p>       <p><font face="Verdana" size="2">La ApoE es un constituyente de las lipoprote&iacute;nas plasm&aacute;ticas con un importante rol en el metabolismo como ligando de receptores de lipoprote&iacute;nas. El gene de la ApoE se localiza en el cromosoma 19q13.2. Las tres isoformas proteicas m&aacute;s frecuentes, ApoE2, ApoE3 y ApoE4, son productos al&eacute;licos del mismo locus y ocurren en frecuencias que var&iacute;an entre poblaciones, pero que se aproximan a 8%, 79% y 13%, respectivamente. Estos alelos se heredan en forma mendeliana simple y su combinaci&oacute;n genera seis genotipos posibles: tres homocigotos (E2/E2, E3/E3, E4/E4) y tres heterocigotos (E2/E3, E2/E4, E3/E4)<a name="-bib7"></a><a name="-bib8"></a>(<a href="#bib7"><sup>7,8</sup></a>).</font></p>       <p><font face="Verdana" size="2">Las variaciones en el locus de ApoE son el factor gen&eacute;tico m&aacute;s relevante a nivel poblacional que afecta las concentraciones de colesterol-LDL plasm&aacute;tico. El alelo E4 se asocia a un aumento de la LDL as&iacute; como con part&iacute;culas LDL de mayor densidad y propensas a la oxidaci&oacute;n(<a href="#bib9"><sup>9</sup></a>)<a name="-bib9"></a>. Los pacientes portadores de este alelo son los que m&aacute;s se benefician del tratamiento con estatinas y de una dieta baja en grasas(<a href="#bib10"><sup>10,11</sup></a>)<a name="-bib10"></a><a name="-bib11"></a>, aunque responden menos a la disminuci&oacute;n de los niveles LDL(<a href="#bib12"><sup>12</sup></a>)<a name="-bib12"></a>.</font></p>       <p><font face="Verdana" size="2">El alelo E4 se vincula con un aumento del riesgo cardiovascular independientemente de sus efectos sobre el perfil lip&iacute;dico(<a href="#bib13"><sup>13</sup></a>)<a name="-bib13"></a>, y potencia de forma sin&eacute;rgica otros factores como el tabaquismo(<a href="#bib14"><sup>14</sup></a>)<a name="-bib14"></a>. En individuos diab&eacute;ticos se ha demostrado un efecto del alelo E4 sobre el da&ntilde;o macrovascular <a name="-bib15"></a>(<a href="#bib15"><sup>15</sup></a>), retinopat&iacute;a (<a href="#bib16"><sup>16</sup></a>)<a name="-bib16"></a> y posiblemente nefropat&iacute;a(<a href="#bib17"><sup>17-19</sup></a>)<a name="-bib17"></a><a name="-bib18"></a><a name="-bib19"></a>.</font></p>       <p><font face="Verdana" size="2">El alelo E2 es el menos frecuente en todas las poblaciones; se asocia al desarrollo de hiperlipoproteinemia familiar tipo III y aterosclerosis prematura en homocigosis(<a href="#bib20"><sup>20</sup></a>)<a name="-bib20"></a>; pero en heterocigosis se asocia en general a una concentraci&oacute;n menor de LDL y mayor de lipoprote&iacute;nas de alta densidad (HDL), por lo que tiene un efecto protector neto para el desarrollo de enfermedad cardiovascular. El alelo E3 es el m&aacute;s frecuente en la poblaci&oacute;n y no se correlaciona con un aumento del riesgo CV ni dislipemias(<a href="#bib21"><sup>21</sup></a>)<a name="-bib21"></a>.</font></p>       <p><font face="Verdana" size="2">En este trabajo se analiza la influencia del genotipo de ApoE sobre indicadores de da&ntilde;o vascular en una poblaci&oacute;n de pacientes con DM2.</font></p>       <p><font face="Verdana" size="2"><strong>Pacientes y m&eacute;todo</strong></font></p>       ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><em>Poblaci&oacute;n</em></font></p>       <p><font face="Verdana" size="2">Se analizaron 78 pacientes DM2 en seguimiento en policl&iacute;nicas de diabetes del Hospital de Cl&iacute;nicas.</font></p>       <p><font face="Verdana" size="2">Se realizaron entrevistas a los pacientes al concurrir al control en su centro de asistencia, se les solicitaron estudios paracl&iacute;nicos de valoraci&oacute;n de las repercusiones macro y microangiop&aacute;ticas requeridos para la evaluaci&oacute;n anual del paciente diab&eacute;tico. Estos datos se recogieron en una ficha individual. Las variables consideradas fueron:</font></p>   <ul>         <li><font face="Verdana" size="2"><strong>Cardiopat&iacute;a isqu&eacute;mica:</strong> antecedentes de infarto agudo de miocardio, <em>angor pectoris</em> con estudios de detecci&oacute;n de isquemia mioc&aacute;rdica positivos debidamente documentados (ergometr&iacute;a, ecocardiograf&iacute;a o centellograma sensibilizados con estr&eacute;s f&iacute;sico o farmacol&oacute;gico), procedimientos de revascularizaci&oacute;n mioc&aacute;rdica realizados.</font></li>         <li><font face="Verdana" size="2"><strong>Nefropat&iacute;a incipiente:</strong> microalbuminuria positiva 20-200 &micro;g/min. Se requerir&aacute; para considerarse positiva por lo menos dos estudios que la confirmen. De haber presentado el paciente: infecci&oacute;n urinaria, proceso febril, descontrol metab&oacute;lico, gestaci&oacute;n, hematuria o insuficiencia card&iacute;aca descompensada, el estudio se realiz&oacute; resuelto el cuadro intercurrente.</font></li>         <li><font face="Verdana" size="2"><strong>Nefropat&iacute;a establecida:</strong> proteinuria de 24 horas mayor a 500 mg.</font></li>         <li><font face="Verdana" size="2"><strong>Insuficiencia renal:</strong> clearance de creatinina menor de 60 ml/min mantenido (en dos oportunidades), de no disponerse en todos los pacientes estudiados se estim&oacute; el filtrado glomerular por f&oacute;rmula de Levey para aquellos pacientes con creatininemias mayores de 1,1 mg/dl. Se registr&oacute; azoemia, creatininemia, estudio del sedimento urinario y uricemia.</font></li>         <li><font face="Verdana" size="2"><strong>Retinopat&iacute;a: </strong>presencia en el fondo de ojo de retinopat&iacute;a proliferativa o no proliferativa.</font></li>         <li><font face="Verdana" size="2"><strong>Factores de riesgo vascular asociados:</strong> tabaquismo; hipertensi&oacute;n arterial (seg&uacute;n pautas diagn&oacute;sticas del S&eacute;ptimo Consenso Americano de Hipertensi&oacute;n Arterial, registrando un promedio de los &uacute;ltimos tres controles en el consultorio, realizados en condiciones est&aacute;ndar, sin que mediara entre los mismos un cambio en la terap&eacute;utica farmacol&oacute;gica); dislipemia, e &iacute;ndice de masa corporal (seg&uacute;n f&oacute;rmula peso/talla2). Para el control de la hipertensi&oacute;n arterial se tuvieron en cuenta las recomendaciones del Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC VII) y de las gu&iacute;as de la American Diabetes Association (ADA) para el paciente diab&eacute;tico, de que las cifras tensionales deben mantenerse en valores de PAS ? 130 mmHg y PAD ? 80 mmHg.</font></li>         <li><font face="Verdana" size="2"><strong>Antecedentes familiares: </strong>se elabor&oacute; una genealog&iacute;a m&eacute;dica a partir de la memoria familiar del paciente &iacute;ndice, interrogando sobre DM y enfermedad coronaria en los familiares de primer grado (padres, hermandad, hijos) del paciente &iacute;ndice.</font></li>       ]]></body>
<body><![CDATA[</ul>   <em>     <p><font face="Verdana" size="2">An&aacute;lisis moleculares</font></p>   </em>     <p><font face="Verdana" size="2">A partir de una muestra de sangre perif&eacute;rica (3 ml) se extrajo el &aacute;cido desoxirribonucleico (ADN) del paciente mediante el uso de kit comercial de purificaci&oacute;n de ADN gen&oacute;mico. La determinaci&oacute;n genot&iacute;pica de los polimorfismos de APOE se realiz&oacute; por t&eacute;cnica de amplificaci&oacute;n por PCR y posterior digesti&oacute;n con enzimas de restricci&oacute;n (PCR-RFLP), descrita por Zivelin y colaboradores(<a href="#bib22"><sup>22</sup></a>)<a name="-bib22"></a>.</font></p>   <em>     <p><font face="Verdana" size="2">An&aacute;lisis estad&iacute;stico</font></p>   </em>     <p><font face="Verdana" size="2">Se utilizaron tests estad&iacute;sticos no param&eacute;tricos analizando datos nominales. Se seleccion&oacute; el test de chi cuadrado para el an&aacute;lisis de las variables cualitativas no pareadas, con correcci&oacute;n de Yates seg&uacute;n n menor a 60; en caso de an&aacute;lisis con un n total menor de 20 se realiz&oacute; seg&uacute;n prueba de Fisher. Se acept&oacute; un error alfa &lt;0,05.</font></p>   <em>     <p><font face="Verdana" size="2">Normas &eacute;ticas</font></p>   </em>     <p><font face="Verdana" size="2">Se obtuvo consentimiento informado en todos los casos. Este proyecto fue aprobado por la Comisi&oacute;n Honoraria para la Salud Cardiovascular, Uruguay, en el contexto de sus programas de valoraci&oacute;n de marcadores moleculares para prevenci&oacute;n de la enfermedad cardiovascular.</font></p>       <p><font face="Verdana" size="2"><strong>Resultados</strong></font></p>       <p><font face="Verdana" size="2"><em>Caracter&iacute;sticas de la poblaci&oacute;n estudiada</em></font></p>       <p><font face="Verdana" size="2">Las caracter&iacute;sticas de la poblaci&oacute;n se detallan en la <a href="/img/revistas/rmu/v29n3/3a02t1.jpg">tabla 1</a>. Se estudiaron 44 hombres (56%) y 34 mujeres (44%) diab&eacute;ticos, menores de 85 a&ntilde;os de edad, de los cuales 79% eran hipertensos, 84% dislip&eacute;micos y 19% tabaquistas.</font></p>       ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Los antecedentes familiares de DM2 (en familiares de primer grado) estuvieron presentes en 58% de los casos y 43% ten&iacute;an antecedentes familiares de patolog&iacute;a cardiovascular.</font></p>       <p><font face="Verdana" size="2">La edad de aparici&oacute;n (estimada por la edad al momento del diagn&oacute;stico) de la DM2 se estableci&oacute; en el promedio de los 49 a&ntilde;os de edad, con un diagn&oacute;stico levemente m&aacute;s temprano en los varones.</font></p>       <p><font face="Verdana" size="2">El perfil lip&iacute;dico mostr&oacute; un leve aumento del colesterol total (CT) y el colesterol asociado a ApoB en las mujeres, pero con superiores valores de HDL-colesterol (10 mg/dL en promedio). La trigliceridemia fue en promedio 45 mg/dL mayor en los hombres.</font></p>       <p><font face="Verdana" size="2">La frecuencia de portadores del alelo e4 de ApoE fue de 28%, ligeramente mayor a la esperada de acuerdo a las frecuencias determinadas en otras poblaciones. La distribuci&oacute;n de genotipos de APOE (<a href="#1">figura 1</a>) en los pacientes estudiados est&aacute; en equilibrio de Hardy-Weimberg (p&lt;0,05), como se espera al analizar las frecuencias genot&iacute;picas para loci de susceptibilidad para patolog&iacute;as complejas de expresi&oacute;n cl&iacute;nica fundamentalmente en el adulto(<a href="#bib23"><sup>23</sup></a>)<a name="-bib23"></a>. El an&aacute;lisis se realiz&oacute; con 66 pacientes de los que se contaba con el genotipo.</p>   <a name="1"></a> </font>     <p align="center"><font face="Verdana" size="2"><img src="/img/revistas/rmu/v29n3/3a02f1.jpg"></font></p>       <p><font face="Verdana" size="2">Las repercusiones estudiadas en la poblaci&oacute;n se detallan en la <a href="/img/revistas/rmu/v29n3/3a02t2.jpg">tabla 2</a>. Se evidenci&oacute; nefropat&iacute;a en 44,9% de los casos (microalbuminuria 63%, macroalbuminuria 17% e insuficiencia renal 20%). La retinopat&iacute;a estaba presente en 20,5% de los casos y cardiopat&iacute;a isqu&eacute;mica en 20,5%.</font></p>   <em>     <p><font face="Verdana" size="2">Relaci&oacute;n entre cardiopat&iacute;a isqu&eacute;mica y la presencia de alelo E4 de APOE</font></p>   </em>     <p><font face="Verdana" size="2">La cardiopat&iacute;a isqu&eacute;mica se asoci&oacute; en forma significativa con la presencia del alelo E4: la misma apareci&oacute; en 56% de los portadores de este alelo versus 25% en los no portadores (chi cuadrado/Pearson p&lt;0,05) (<a href="#2">figura 2</a>).</p>   <a name="2"></a> </font>     <p align="center"><font face="Verdana" size="2"><img src="/img/revistas/rmu/v29n3/3a02f2.jpg"></font></p>   <em>     <p><font face="Verdana" size="2">Relaci&oacute;n entre la edad al diagn&oacute;stico de diabetes y el genotipo de APOE</font></p>   </em>     ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Se observ&oacute; una edad al diagn&oacute;stico de la diabetes menor para los individuos de genotipo E3/E4 (44,7 a&ntilde;os) en comparaci&oacute;n con los E2/E3 (50,5 a&ntilde;os) y los E3/E3 (49,8 a&ntilde;os) (<a href="/img/revistas/rmu/v29n3/3a02f3.jpg">figura 3</a>). La presencia de un alelo E4 se asoci&oacute; significativamente con un diagn&oacute;stico de diabetes antes de los 40 a&ntilde;os (p&lt;0,005) (<a href="/img/revistas/rmu/v29n3/3a02f4.jpg">figura 4</a>).</font></p>   <em>     <p><font face="Verdana" size="2">Hallazgo de alteraciones en el lipidograma seg&uacute;n polimorfismos de APOE</font></p>   </em>     <p><font face="Verdana" size="2">Los pacientes portadores del alelo E4 presentaron valores de colesterol total (CT), LDL y triglic&eacute;ridos (TG) aumentados con respecto a los que no portaban dicho alelo (<a href="/img/revistas/rmu/v29n3/3a02t3.jpg">tabla 3</a>).</font></p>   <em>     <p><font face="Verdana" size="2">Asociaciones no evidenciadas</font></p>   </em>     <p><font face="Verdana" size="2">No se encontraron asociaciones significativas entre los genotipos de ApoE y las otras repercusiones parenquimatosas estudiadas: nefropat&iacute;a y retinopat&iacute;a.</font></p>   <strong>     <p><font face="Verdana" size="2">Discusi&oacute;n</font></p>   </strong>     <p><font face="Verdana" size="2">Se evidenci&oacute; el efecto del alelo E4 del gene APOE como factor de susceptibilidad para CI y complicaciones macrovasculares de la diabetes. M&uacute;ltiples estudios en diab&eacute;ticos(<a href="#bib24"><sup>24,25</sup></a>)<a name="-bib24"></a><a name="-bib25"></a> y no diab&eacute;ticos demostraron que el alelo E4 se asocia con alteraciones pro aterog&eacute;nicas del perfil lip&iacute;dico y un aumento significativo del riesgo cardiovascular, independientemente de sus efectos sobre los niveles de l&iacute;pidos plasm&aacute;ticos(<a href="#bib13"><sup>13,</sup></a><a href="#bib26"><sup>26</sup></a>)<a name="-bib26"></a>. En el estudio 4S, el alelo E4 se asocia con un aumento significativo del riesgo cardiovascular y se muestra que los portadores del alelo E4 son los m&aacute;s beneficiados por tratamiento con estatinas(<a href="#bib27"><sup>27</sup></a>)<a name="-bib27"></a>. Asimismo se ha demostrado la influencia de las interacciones genotipo ApoE-ambiente en la determinaci&oacute;n de la patolog&iacute;a vascular en diab&eacute;ticos(<a href="#bib28"><sup>28,29</sup></a>)<a name="-bib28"></a><a name="-bib29"></a>.</font></p>       <p><font face="Verdana" size="2">En nuestro trabajo, adem&aacute;s, se evidencia la influencia pro aterog&eacute;nica del alelo E4 sobre el perfil lip&iacute;dico, con mayores niveles plasm&aacute;ticos de CT, LDL y TG y menores de HDL en los portadores de este alelo. Estos resultados son compatibles con los encontrados en trabajos internacionales anteriores tanto en pacientes diab&eacute;ticos como no diab&eacute;ticos(<a href="#bib30"><sup>30-32</sup></a>)<a name="-bib30"></a><a name="-bib31"></a><a name="-bib32"></a>. Asimismo se evidencia un nivel mayor de colesterol-no HDL en los portadores del alelo E4, del cual se ha demostrado que es un buen predictor de la incidencia de enfermedad cardiovascular ateroscler&oacute;tica en diab&eacute;ticos(<a href="#bib31"><sup>31</sup></a>).</font></p>       <p><font face="Verdana" size="2">Frecuentemente el diagn&oacute;stico de DM2 se realiza por primera vez ante la aparici&oacute;n de complicaciones y una vez establecido el da&ntilde;o en &oacute;rganos blanco. Si consideramos que la edad al diagn&oacute;stico es un indicador de progresi&oacute;n de la DM y un &iacute;ndice de la celeridad en la aparici&oacute;n de alteraciones funcionales y complicaciones, deber&iacute;a existir una relaci&oacute;n entre la presencia de genotipos de riesgo como E4 y una menor edad al diagn&oacute;stico de esas alteraciones. En la poblaci&oacute;n analizada, cuando el alelo E4 estaba presente, el diagn&oacute;stico de la DM2 fue m&aacute;s temprano, lo que podr&iacute;a deberse a la mayor susceptibilidad a complicaciones macrovasculares en estos pacientes.</font></p>       <p><font face="Verdana" size="2">Tanto la DM2 como la aterosclerosis son patolog&iacute;as multifactoriales y complejas en su etiopatogenia (<a href="#bib32"><sup>32-35</sup></a>)<a name="-bib33"></a><a name="-bib34"></a><a name="-bib35"></a>. Las variantes gen&eacute;ticas participantes en estas afecciones pueden ser decenas y los efectos de cada polimorfismo individual son, en general, peque&ntilde;os y dependientes del contexto gen&eacute;tico y ambiental en el que se expresan. Adicionalmente, diversas evidencias indican que es la sumatoria de alelos de riesgo en los polimorfismos gen&eacute;ticos estudiados, cuyo efecto puede ser aditivo o sin&eacute;rgico, la que determinar&iacute;a una parte de la susceptibilidad de complicaciones vasculares en los DM2(<a href="#bib36"><sup>36,37</sup></a>)<a name="-bib36"></a><a name="-bib37"></a>.</font></p>       ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2">Paulatinamente hemos ido incorporando otras variantes polim&oacute;rficas y asociadas a la enfermedad cardiovascular ateroscler&oacute;tica en la evaluaci&oacute;n de pacientes de alto riesgo cardiovascular. Este trabajo est&aacute; actualmente en desarrollo y sus resultados se publicar&aacute;n en el futuro. Entre las variantes analizadas est&aacute;n: polimorfismos simples en la regi&oacute;n 9p21(<a href="#bib38"><sup>38</sup></a>)<a name="-bib38"></a>, el polimorfismo inserci&oacute;n/delecci&oacute;n del gene de la enzima convertidora de la angiotensina (ACE I/D)(<a href="#bib39"><sup>39</sup></a>)<a name="-bib39"></a>, el polimorfismo C825T de la prote&iacute;na G subunidad beta 3 (PGB3)(<a href="#bib40"><sup>40</sup></a>)<a name="-bib40"></a> y el polimorfismo inserci&oacute;n/deleci&oacute;n de la haptoglobina(<a href="#bib41"><sup>41,42</sup></a>)<a name="-bib41"></a><a name="-bib42"></a>.</font></p>       <p><font face="Verdana" size="2">Las principales limitaciones de nuestro estudio derivan de que la muestra estudiada fue peque&ntilde;a. Para estudios de asociaci&oacute;n de polimorfismos gen&eacute;ticos en caracteres complejos, en general se requieren muestras poblacionales grandes para demostrar un efecto(<a href="#bib43"><sup>43</sup></a>)<a name="-bib43"></a>. Sin embargo, para ciertos fenotipos como enfermedad coronaria se comprob&oacute; el efecto de la variante E4 de la ApoE. Para otras repercusiones estudiadas no se encontraron asociaciones con este polimorfismo. Otra limitaci&oacute;n es el car&aacute;cter evolutivo de la mayor&iacute;a de los fenotipos estudiados. Para este tipo de afecciones, en general, se utilizan estudios de seguimiento poblacional. De todos modos, aun si se toma como una instant&aacute;nea de la poblaci&oacute;n de diab&eacute;ticos estudiada, el efecto del alelo E4 de la ApoE es evidente.</font></p>       <p><font face="Verdana" size="2">El polimorfismo aqu&iacute; analizado es uno de los m&aacute;s estudiados en enfermedades humanas multifactoriales. Particularmente relevante es el rol del alelo E4 en las enfermedades neurodegenerativas, especialmente la enfermedad de Alzheimer (EA)(<a href="#bib44"><sup>44,45</sup></a>)<a name="-bib44"></a><a name="-bib45"></a>. Diversos factores de riesgo cardiovascular lo son tambi&eacute;n para la EA. Esta convergencia probablemente refleje complejas interacciones que hacen que estas patolog&iacute;as se conviertan en factores de riesgo entre ellas y/o compartan factores de riesgo, y, por lo tanto, medidas de prevenci&oacute;n comunes(<a href="#bib46"><sup>46-49</sup></a>)<a name="-bib46"></a><a name="-bib47"></a><a name="-bib48"></a><a name="-bib49"></a>.</font></p>       <p><font face="Verdana" size="2">La validaci&oacute;n de estas asociaciones en nuestra poblaci&oacute;n, gen&eacute;ticamente heterog&eacute;nea, refuerza los v&iacute;nculos fisiopatol&oacute;gicos de las variantes polim&oacute;rficas del gene APOE con complicaciones de la DM2, fundamentalmente cardiovasculares, y las posibilidades en relaci&oacute;n al uso de la informaci&oacute;n genot&iacute;pica en el manejo cl&iacute;nico de estos pacientes y la prevenci&oacute;n en estos grupos familiares.</font></p>   <strong>     <p><font face="Verdana" size="2">Conclusiones</font></p>   </strong>     <p><font face="Verdana" size="2">Los resultados obtenidos apoyan el car&aacute;cter modificador de diferentes genotipos de ApoE en la presentaci&oacute;n de la DM2, y el rol pro aterog&eacute;nico del alelo E4 en estos pacientes. En suma, en nuestro trabajo el alelo E4 se asoci&oacute; a una mayor probabilidad de una presentaci&oacute;n m&aacute;s precoz de sintomatolog&iacute;a diagn&oacute;stica y una progresi&oacute;n hacia la presencia de cardiopat&iacute;a isqu&eacute;mica en los pacientes portadores de esta variante. Adicionalmente, en los portadores del alelo E4 se observ&oacute; una mayor tendencia a asociar complicaciones macroangiop&aacute;ticas en general (43,5% versus 26,2%) y se evidenci&oacute; un efecto del genotipo de APOE sobre el perfil lip&iacute;dico aumentando el &iacute;ndice de riesgo cardiovascular. Estos resultados sugieren la consideraci&oacute;n del uso del genotipado de ApoE como un test v&aacute;lido de b&uacute;squeda de un marcador constitutivo de progresi&oacute;n temprana de la DM2.</font></p>   <strong>     <p><font face="Verdana" size="2">Abstract</font></p>   </strong>     <p><font face="Verdana" size="2"><strong>Introduction: </strong>apolipoproiten E (ApoE) is a constituent of plasma lipoproteins that plays an important role in metabolism acting as lipoprotein receptor ligand. Variations in the ApoE locus are associated to variations in concentration of low plasma density lipoproteins. Allele E4 has been associated to an increase of risk for cardiovascular disease, progress in diabetic nephropathies and severity and progression of diabetic neuropathies and retinopathies. Allele E2 is associated to conferring protection from coronary heart disease (CHD).</font></p>       <p><font face="Verdana" size="2"><strong>Objectives:</strong> to study the association between this polymorphism and the macroangiopathic effects, especially in terms of ischemic cardiopathy, and lipidogram in diabetic patients.</font></p>       <p><font face="Verdana" size="2"><strong>Method: </strong>78 patients less than 85 years old with type 2 diabetes mellitus were studied, being the association between the ApoE polymorphism and the macroangiopathic and microangiopathic effects of diabetes assessed, as well as the lipidogram and age of patients at time of diagnosis. Genotype determination was done with standard extending-restricting methods following informed consent. Variables were analysed using Chi-scuared and the Fisher exact test. Alpha error rate was lower than 0.05.</font></p>       ]]></body>
<body><![CDATA[<p><font face="Verdana" size="2"><strong>Results:</strong> frequency of carriers of ApoE allele E4 among individuals with macroangiopathic complications was larger than among those who were free of these complications (26.2%), although differences were not statistically significant. The presence of ischemic heart disease was significantly associated with E4 allele, that is 56% versus 25%. The presence of the E4 allele was significantly associated to the diagnosis of diabetes earlier than 40 years old. Patients with risk alleles evidenced increased values of LDL and triglycerides.</font></p>       <p><font face="Verdana" size="2"><strong>Conclusions: </strong>allele E4 was associated with a larger risk for ischemic cardiopathy and age of diagnosing type 2 diabetes mellitus lower than 40 years old. The strong effect of genotype ApoE was evidence on the lipid profile of patients with type 2 diabetes.</font></p>   <strong>     <p><font face="Verdana" size="2">Resumo</font></p>   </strong>     <p><font face="Verdana" size="2"><strong>Introdu&ccedil;&atilde;o:</strong> a apolipoprote&iacute;na E (ApoE) &eacute; um dos elementos das lipoprote&iacute;nas plasm&aacute;ticas e tem um papel importante no metabolismo como ligando dos receptores de lipoprote&iacute;nas. As varia&ccedil;&otilde;es no l&oacute;cus de ApoE est&atilde;o vinculadas a varia&ccedil;&otilde;es nas concentra&ccedil;&otilde;es de lipoprote&iacute;nas plasm&aacute;ticas de baixa densidade (LDL). O alelo E4 est&aacute; vinculado a um aumento do risco cardiovascular, &agrave; progress&atilde;o da nefropatia diab&eacute;tica como tamb&eacute;m &agrave; gravidade e a progress&atilde;o de neuropatia e retinopatia diab&eacute;ticas. O alelo E2 est&aacute; associado a um efeito final protetor para o desenvolvimento de doen&ccedil;a cardiovascular.</font></p>       <p><font face="Verdana" size="2"><strong>Objetivos:</strong> estudar a associa&ccedil;&atilde;o entre este polimorfismo e as repercuss&otilde;es macroangiop&aacute;ticas, especialmente cardiopatia isqu&ecirc;mica, e o lipidograma em pacientes diab&eacute;ticos.</font></p>       <p><font face="Verdana" size="2"><strong>Material e m&eacute;todo: </strong>foram estudados 78 pacientes diab&eacute;ticos tipo 2, com menos de 85 anos de idade, para avaliar a associa&ccedil;&atilde;o entre o polimorfismo de ApoE e as repercuss&otilde;es macroangiop&aacute;ticas e microangiop&aacute;ticas da diabetes, o lipidograma e a idade no momento do diagn&oacute;stico da diabetes. A determina&ccedil;&atilde;o genot&iacute;pica foi realizada por m&eacute;todos padr&otilde;es de amplifica&ccedil;&atilde;o-restri&ccedil;&atilde;o, com consentimento informado dos pacientes. As vari&aacute;veis foram analisadas utilizando chi quadrado e prova de Fisher. Erro alfa menor a 0,05.</font></p>       <p><font face="Verdana" size="2"><strong>Resultados:</strong> a frequ&ecirc;ncia de portadores do alelo E4 de la Apo E entre os indiv&iacute;duos com complica&ccedil;&otilde;es macroangiop&aacute;ticas (43,5%) foi maior que entre aqueles que n&atilde;o apresentavam essas complica&ccedil;&otilde;es (26,2%), embora as diferen&ccedil;as n&atilde;o tenham sido estatisticamente significativas. A presen&ccedil;a de cardiopatia isqu&ecirc;mica foi associada significativamente com o alelo E4, 56% versus 25%. A presen&ccedil;a do alelo E4 foi associado significativamente com diagn&oacute;stico de diabetes antes dos 40 anos. Os pacientes com alelos de risco apresentaram valores de LDL e triglic&eacute;rides (TG) aumentados.</font></p>       <p><font face="Verdana" size="2"><strong>Conclus&otilde;es:</strong> o alelo E4 foi associado a um maior risco de cardiopatia isqu&ecirc;mica e idade no momento do diagn&oacute;stico de DM2 menor a 40 anos. Foi observado um efeito do gen&oacute;tipo de ApoE sobre o perfil lip&iacute;dico dos pacientes diab&eacute;ticos tipo 2.</font></p>   <strong>     <p><font face="Verdana" size="2">Bibliograf&iacute;a</font></p>   </strong>     <!-- ref --><p><font face="Verdana" size="2"><a name="bib1"></a><a href="#-bib1">1</a>.	<strong>Keane WF, Brenner BM, de Zeeuw D, Grunfeld JP, McGill J, Mitch WE, et al.</strong>The risk of developing end-stage renal disease in patients with type 2 diabetes and nephropathy: the RENAAL study. 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