肿瘤坏死因子-α增强肾小球前小动脉平滑肌细胞内I型三磷酸肌醇受体的表达

被引:16
作者
王静艳
孙锦春
吕飒
刘沛
机构
[1] 中国医科大学第二临床学院传染科,沈阳医学院第一医院内科,中国医科大学第二临床学院传染科,中国医科大学第二临床学院传染科沈阳,沈阳,沈阳
关键词
肿瘤坏死因子; 肌醇1,4,5-三磷酸; 平滑肌细胞;
D O I
暂无
中图分类号
R363 [病理生理学];
学科分类号
摘要
目的 探讨肿瘤坏死因子 α(TNF α)对肾小球前小动脉平滑肌细胞 (RASMC)Ⅰ型三磷酸肌醇 (IP3 )受体蛋白表达的影响。方法 通过对RASMC的分离、培养和鉴定 ,应用蛋白和核酸杂交技术分别检测TNF α作用后RASMC中Ⅰ型IP3 受体蛋白和Ⅰ型IP3 受体mRNA的表达情况 ,同时测定Ⅰ型IP3 受体mRNA的半衰期。结果 TNF α能增强RASMC内Ⅰ型IP3 受体蛋白的表达 ,且两者呈剂量依赖关系 ;TNF α能促进Ⅰ型IP3 受体mRNA的表达 ,同时使受体蛋白合成增加 ;而TNF α对Ⅰ型IP3受体mRNA的影响不是抑制mRNA的降解 ,而是使其表达增加。结论 TNF α可能作用于Ⅰ型IP3 受体mRNA的基因启动子 ,使其合成增加 ,由此导致Ⅰ型IP3 受体蛋白表达增加 ,诱导RASMC内储备的Ca2 + 释放至细胞浆 ,引起肾小球前小动脉平滑肌细胞收缩 ,使肾血流量减少 ,肾小球滤过率下降 ,从而导致肾功能异常
引用
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页码:17 / 20
页数:4
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