Polimorfismos de ApoE y daño vascular en diabéticos tipo 2
Palabras clave:
APOLIPOPROTEÍNA E4, DIABETES MELLITUS TIPO 2, ISQUEMIA MIOCARDICAResumen
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.
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