Avaliação gênica da sintase de óxido nítrico endotelial (eNOS) em adultos de mesma idade e idosos hipertensos submetidos ao treinamento físico: efeito na pressão arterial
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Data
2007-09-14
Autores
Zago, Anderson Saranz [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
Uma alta incidência de hipertensão arterial, que possui uma etiologia multifatorial envolvendo fatores genéticos, ambientais e psicológicos, tem sido observada na população mundial. Desta forma o entendimento dos mecanismos celulares e moleculares envolvidos na gênese da hipertensão arterial é fundamental para se alcançar medidas preventivas e terapêuticas para o controle da pressão arterial. O óxido nítrico (NO) produzido pelas células endoteliais assume um importante papel no controle cardiovascular, pois tem sido considerado ser um potente vasodilatador e regulador da pressão arterial. Entretanto, as disfunções endoteliais, caracterizadas pela baixa produção e/ou biodisponibilidade do NO e alguns fatores genéticos (polimorfismos), podem contribuir para o surgimento da hipertensão arterial. Assim, o objetivo deste estudo foi investigar a influência de um programa de exercício aeróbio nas concentrações e biodisponibilidade de NO em portadores do polimorfismo T-786C do gene da eNOS e verificar o efeito dessas variáveis na pressão arterial. O DNA dos participantes foi isolado das células mononucleares periféricas e o diagnóstico genético foi realizado pela técnica de PCR. As análises de concentrações de NO, atividade da superóxido dismutase (SOD), pressão arterial, fluxo sanguíneo, composição corporal (índice de massa corporal e porcentagem de gordura corporal), perfil lipídico (colesterol total, LDL-colesterol, HDL-colesterol e triglicerídeos) e glicemia foram analisadas antes de após 6 meses de um programa de exercício físico aeróbio (70% do VO2 max) em adultos de meia idade e idosos subdivididos de acordo com a genotipagem o nível inicial de pressão arterial. Os resultados mostraram que as variáveis do perfil lipídico não exerceram nenhuma influência na relação entre hipertensão, concentrações de NO e polimorfismo do gene da eNOS...
Hypertension has a high incidence in the population of the world and its etiology is multifatorial, involving genetic, environmental and psychological factors. Understanding of the cell and molecular mechanisms involved in the genesis of hypertension is fundamental for the attainment of preventive and/or therapeutic measures for blood pressure control. Nitric Oxide (NO) produced by the endothelial cells has a particularly important role in cardiovascular control because it is a potent vasodilator and thus its role in blood pressure control is extremely relevant. However, the endothelial dysfunction which is characterized by a lower production and/or NO bioavailability, and some genetic factors can contribute to the genesis of hypertension. Therefore, the purpose of this study was investigate the influence of aerobic exercise training (AEX) on the NO concentration and bioavailability in 786C allele carriers and verify the effect of theses variable on the blood pressure. Genomic DNA was isolated from peripheral mononuclear cells and genotyping was done by standard PCR methods. The NOx assay, SOD activity, casual blood pressure, blood flow, body composition (body mass index and body fat), and lipid profile (cholesterol, LDL-cholesterol, HDLcholesterol, glucose, and triglycerides) was evaluated before and after 6 months of AEX (70% of VO2 max) in adults and elderly divided in groups according genotype and blood pressure levels. The results showed that there is no interference of lipid profile on the relationship among hypertension, NO concentration and eNOS polymorphism and the body composition variables showed a small interference on this relationship. NOx levels was associated with blood pressure values and NOx levels were significantly lower in the TC+CC group compared to the TT group at baseline... (Complete abstract click electronic access below)
Hypertension has a high incidence in the population of the world and its etiology is multifatorial, involving genetic, environmental and psychological factors. Understanding of the cell and molecular mechanisms involved in the genesis of hypertension is fundamental for the attainment of preventive and/or therapeutic measures for blood pressure control. Nitric Oxide (NO) produced by the endothelial cells has a particularly important role in cardiovascular control because it is a potent vasodilator and thus its role in blood pressure control is extremely relevant. However, the endothelial dysfunction which is characterized by a lower production and/or NO bioavailability, and some genetic factors can contribute to the genesis of hypertension. Therefore, the purpose of this study was investigate the influence of aerobic exercise training (AEX) on the NO concentration and bioavailability in 786C allele carriers and verify the effect of theses variable on the blood pressure. Genomic DNA was isolated from peripheral mononuclear cells and genotyping was done by standard PCR methods. The NOx assay, SOD activity, casual blood pressure, blood flow, body composition (body mass index and body fat), and lipid profile (cholesterol, LDL-cholesterol, HDLcholesterol, glucose, and triglycerides) was evaluated before and after 6 months of AEX (70% of VO2 max) in adults and elderly divided in groups according genotype and blood pressure levels. The results showed that there is no interference of lipid profile on the relationship among hypertension, NO concentration and eNOS polymorphism and the body composition variables showed a small interference on this relationship. NOx levels was associated with blood pressure values and NOx levels were significantly lower in the TC+CC group compared to the TT group at baseline... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Educação física adaptada, Educação fisica, Exercícios físicos, Hipertensão, Oxido nitrico, Pressão arterial, Hipertensão arterial, Nitric oxide, Hypertension, Blood pressure
Como citar
ZAGO, Anderson Saranz. Avaliação gênica da sintase de óxido nítrico endotelial (eNOS) em adultos de mesma idade e idosos hipertensos submetidos ao treinamento físico: efeito na pressão arterial. 2007. 133 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2007.