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绿茶对实验大鼠血管钙化的影响

, PP. 424-426

Keywords: 绿茶,大鼠,血管钙化,血管紧张素Ⅱ

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Abstract:

目的观察饮用绿茶对大鼠血管钙化的影响及其可能机制。HTXK方法用肌注维生素D?3和灌胃尼古丁诱导大鼠血管钙化模型。实验分为对照组、钙化组、低剂量和高剂量绿茶干预组。VonKossa染色,原子吸收分光光度法测定钙含量,放射免疫分析法测定血浆、血管骨钙素(osteocalcin,OC)、血管紧张素Ⅱ(angiotensinII,AngⅡ)及碱性磷酸酶(alkalinephosphatase,ALP)活性。结果钙化组大鼠血管染色见平滑肌细胞内和细胞间基质有大量黑色颗粒聚集;与对照组相比,主动脉钙含量、ALP活性、OC和AngⅡ含量均有明显增加;采用50g/L和100g/L绿茶防治大鼠均可抑制血管钙化,且高剂量时效应强于低剂量;与钙化组相比较,血管组织钙化指标均下降,而主动脉AngⅡ含量亦有减少。结论饮用绿茶可能部分通过拮抗血浆和血管组织局部的AngⅡ系统效应而产生抑制大鼠血管组织钙化的作用。

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