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-  2015 

高浓度葡萄糖诱导大鼠肾小球系膜细胞VEGF的表达上调依赖于PKCβⅠ和RhoA的活化 High Glucose Induces Vascular Endothelial Growth Factor Upregulation in Rat Mesangial Cells via Activating PKC BetaⅠ and RhoA

Keywords: 肾小球系膜细胞,糖尿病肾病,VEGF,PKCβⅠ,RhoA

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Abstract:

目的:研究高浓度葡萄糖是否通过蛋白激酶C(PKC)βⅠ和RhoA信号通路介导大鼠肾小球系膜细胞血管内皮生长因子(VEGF)表达上调。方法:体外培养SD大鼠肾小球系膜细胞,给予葡萄糖和各种抑制剂处理细胞,提取细胞蛋白,采用Western免疫印迹检测PKCβⅠ及RhoA蛋白的表达量变化,同时提取RNA,采用实时定量PCR观察VEGF mRNA浓度变化。结果:高浓度葡萄糖(30mmol/L)诱导肾小球系膜细胞VEGF mRNA表达增加,而甘露醇对照组VEGF mRNA表达水平未见明显改变(P>0.05)。高浓度葡萄糖刺激系膜细胞RhoA和PKCβⅠ发生活化,RhoA-GTP蛋白和胞膜PKCβⅠ蛋白均呈时间依赖性增加。使用Rho激酶特异性抑制剂(HA-1077)预处理细胞后,VEGF mRNA表达量与高糖组相比明显下调(P<0.05)。进一步使用广谱PKC抑制剂(PMA)、传统PKC抑制剂(G6976)以及PKCβ特异性抑制剂(LY333531)预处理细胞后,VEGF mRNA和RhoAGTP蛋白表达量与高糖组相比均受到抑制(P<0.05)。结论:高浓度葡萄糖可能通过间接活化PKCβⅠ来激活RhoA信号通路,从而上调系膜细胞VEGF的表达,该信号通路在糖尿病肾病的病理过程中发挥着重要作用

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