O efeito do extrato de semente de uva vermelha na atividade do soro paraoxonase em doentes com hiperlipidemia leve a moderada
Palavras-chave:
HDL-colesterol, Apolipoproteína A-I, Flavonoides, LDL-colesterol, ColesterolResumo
CONTEXTO E OBJETIVO: Extrato de semente de uva vermelha (RGSE) contém complexos de proantocianidinas oligoméricas como classe de flavonoides. Estes compostos são antioxidantes potentes e exercem muitos efeitos de promoção da saúde. Este estudo visou determinar os efeitos de RGSE nos níveis séricos de triglicérides (TG), colesterol total (TC), colesterol de lipoproteína alta-densidade (HDL-C), colesterol de lipoproteína baixa-densidade (LDL-C), apolipoproteína AI (apo-AI) e atividade de paraoxonase (PON) em pacientes com hiperlipidemia leve a moderada (MMH). DESENHO E LOCAL: Estudo clínico randomizado duplo-cego controlado com placebo, realizado no Hospital Shahid-Modarres (Teerã, Irã) e na Universidade de Ciências Médicas de Tabriz. Setenta pacientes com MMH foram aleatoriamente designados para receber tratamento (200 mg/dia de RGSE) ou placebo durante oito semanas. RESULTADOS: Elevação significativa nos níveis séricos de apo-AI (P = 0,001), HDL-C (P = 0,001) e atividade de PON (P = 0,001) e diminuição marcada nas concentrações de TC (P = 0,015), TG (P = 0,011) e LDL-C (P = 0,014) foram encontradas nos casos. Atividade de PON mostrou correlação significativa com apo-AI (r = 0,270; P < 0,01) e HDL-C (r = 0,45; P < 0,001). Diferenças significativas entre os grupos RGSE e controle (antes e após tratamento) para TC (P = 0,001), TG (P = 0,001), PON (P = 0,03), apo-AI (P = 0,001) e LDL-C (P = 0,002) foram observadas. CONCLUSÃO: É possível que RGSE aumente atividade de PON principalmente através da elevação dos níveis de HDL-C e apo-AI em pacientes MMH. Ele pode, assim, ter efeitos benéficos potenciais na prevenção de estresse oxidativo e aterosclerose nesses pacientes.
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