葛根素对糖尿病心肌细胞的保护及其机制研究(英文)

被引:36
作者
潘振宇 [1 ]
包兆胜 [1 ]
吴仲敏 [1 ]
汪旭明 [1 ]
郑景璋 [1 ]
沈岳良 [2 ]
张晓明 [2 ]
机构
[1] 台州学院医学院
[2] 浙江大学医学院
关键词
葛根素; 糖尿病心肌病; 心功能; 血小板反应素1;
D O I
暂无
中图分类号
R285.5 [中药实验药理];
学科分类号
100806 [中药药理学];
摘要
观察葛根素(Puerarin)对链脲佐菌素(streptozotocin,STZ)诱导的糖尿病大鼠心肌细胞的保护作用,并探讨血小板反应素1(Thrombospondin-1,TSP-1)的表达改变及其作用。雄性SD大鼠45只随机分为三组(n=15):糖尿病组和葛根素治疗组采用一次腹腔注射链脲佐菌素(STZ)65mg/kg制备糖尿病模型,其中葛根素治疗组于造模后葛根素腹腔注射4周(100mg/kg/day),正常对照组仅腹腔注射等量生理盐水(6ml/kg),同样喂养4周。四周后各组大鼠处死,H-E染色及透射电子显微镜观察三组大鼠心肌细胞纤维显微结构和超微结构的病理改变,免疫组化和实时荧光定量PCR法观察大鼠心肌细胞中TSP-1蛋白和mRNA表达的变化,同时利用Langendorff离体心脏灌流法测定各组大鼠心室肌细胞功能。结果发现葛根素治疗组较糖尿病组大鼠的体重增加明显,同时血糖下降,有显著性差异(P<0.01)。H-E染色显示糖尿病大鼠多处心肌肌丝紊乱伴少量炎症细胞浸润,电镜下发现有线粒体嵴消失溶解,肌丝排列紊乱等病理改变,而葛根素治疗组大鼠偶见上述病理变化。免疫组化显示葛根素治疗组心肌内TSP-1阳性细胞密度小于糖尿病大鼠,TSP-1mRNA表达也比糖尿病大鼠要低。此外葛根素治疗组大鼠的左室收缩末压(LVSEP)、左心室舒张末期压(LVEDP)等心功能指标均明显低于正常组(P<0.01),但较糖尿病组有显著改善(P<0.01)。上述结果显示葛根素能保护糖尿病大鼠心肌细胞的高糖损伤和维持心室肌细胞的功能,而该机制可能与抑制心肌细胞TSP-1表达的水平有关。
引用
收藏
页码:137 / 144
页数:8
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