Accumulating evidence suggests that the small G protein Rho and its downstream effec-tor Rho kinase may play important roles in kidney biology. The present study examined the effects of a Rho-kinase inhibitor, fasudil...Accumulating evidence suggests that the small G protein Rho and its downstream effec-tor Rho kinase may play important roles in kidney biology. The present study examined the effects of a Rho-kinase inhibitor, fasudil, on daunorubicin-induced progressive glomerulosclerosis and explored the underlying mechanism by which fasudil ameliorates glomerulosclerosis. Thirty-six male SD rats were randomly allocated into sham-operation group （sham group, n=12）, unilateral nephrectomy （UNX）＋daunorubicin （DRB） group （model group, n=12）, UNX＋DRB＋Fasudil group （treatment group, n=12）. Two to four weeks after the establishment of the animal model, 6 rats in each group were taken randomly for the detection of 24-h urine protein excretion. Kidney sections were exam-ined by HE and PAS staining, immunohistochemistry and transmission electric microscopy （TEM）. The expression of Rho-kinase mRNA and P27 mRNA in kidney were detected by RT-PCR. It was found that the 24-h urine protein excretion in model group was increased significantly as compared with sham group （P〈0.01）. But this increase was significantly suppressed by fasudil （P〈0.05）. At 4 week, the foot process effacement in podocytes, mesangial proliferation and ECM accumulation were observed in model group, presenting as focal segmental glomerulosclerosis. But in the treatment group, the fasudil alleviated glomerular injury, with proliferating cell nuclear antigen （PCNA）-positive cell infiltration ameliorated and the expression of P27 increased. The expression of Rho-kinase mRNA was significantly enhanced in model group and was suppressed in treatment group. Moreover, fasudil up-regulated the mRNA expression of P27. Our study demonstrated that the glomerulosclerosis was substantially ameliorated by inhibiting the expression of Rho-kinase. It is suggested that Rho-kinase pathway is involved in the renal injury and the inhibition of Rho-kinase may constitute a therapeutic strategy for the treatment of renal injury.展开更多
文摘目的研究高磷对血管内皮细胞代谢影响并观察MAPK通路变化情况。方法体外培养人脐静脉血管内皮细胞(human umbilical vein endothelial cells,HUVEC)24 h,分为正常浓度组(1.0 mmol/L)、高磷浓度组(3.0 mmol/L)。通过气相色谱/质谱(gas chromatography/mass spectrometry,GC/MS)方法分析代谢物图谱,并采用正交信号校正和偏最小二乘判别分析方法(OSC-PLS-DA)。根据OSC-PLS-DA模型的变量权重(variable importance for projection,VIP)>1及显著性差异检验结果筛选出差异性代谢物。同时用AnnexinV-FITC/PI双染法检测细胞凋亡率;Western印记法检测MAPK通路ERK1/2、p-ERK1/2、p38 M APK、p-p38 M APK、JNK、p-JNK蛋白表达。结果鉴别出16个显著差异物质,涉及碳水化合物、氨基酸以及脂质代谢通路紊乱;与1.0 mmol/L Pi组相比,3.0 mmol/L Pi组细胞凋亡率明显升高(P<0.05),p-ERK1/2蛋白表达明显升高(P<0.05),p-p38 M APK蛋白表达明显下降(P<0.05),ERK1/2、p38 M APK、JNK和p-JNK蛋白表达无明显改变。结论高磷诱导内皮细胞凋亡是通过上调p-ERK信号通路及下调p-p38MAPK信号通路的活性来实现的。
文摘Accumulating evidence suggests that the small G protein Rho and its downstream effec-tor Rho kinase may play important roles in kidney biology. The present study examined the effects of a Rho-kinase inhibitor, fasudil, on daunorubicin-induced progressive glomerulosclerosis and explored the underlying mechanism by which fasudil ameliorates glomerulosclerosis. Thirty-six male SD rats were randomly allocated into sham-operation group （sham group, n=12）, unilateral nephrectomy （UNX）＋daunorubicin （DRB） group （model group, n=12）, UNX＋DRB＋Fasudil group （treatment group, n=12）. Two to four weeks after the establishment of the animal model, 6 rats in each group were taken randomly for the detection of 24-h urine protein excretion. Kidney sections were exam-ined by HE and PAS staining, immunohistochemistry and transmission electric microscopy （TEM）. The expression of Rho-kinase mRNA and P27 mRNA in kidney were detected by RT-PCR. It was found that the 24-h urine protein excretion in model group was increased significantly as compared with sham group （P〈0.01）. But this increase was significantly suppressed by fasudil （P〈0.05）. At 4 week, the foot process effacement in podocytes, mesangial proliferation and ECM accumulation were observed in model group, presenting as focal segmental glomerulosclerosis. But in the treatment group, the fasudil alleviated glomerular injury, with proliferating cell nuclear antigen （PCNA）-positive cell infiltration ameliorated and the expression of P27 increased. The expression of Rho-kinase mRNA was significantly enhanced in model group and was suppressed in treatment group. Moreover, fasudil up-regulated the mRNA expression of P27. Our study demonstrated that the glomerulosclerosis was substantially ameliorated by inhibiting the expression of Rho-kinase. It is suggested that Rho-kinase pathway is involved in the renal injury and the inhibition of Rho-kinase may constitute a therapeutic strategy for the treatment of renal injury.
