Effects of benazepril on the expressions of intergrin-linked kinase and α-smooth muscle actin in glomerular mesangial cells exposed to high glucose / 中华肾脏病杂志

ABSTRACT

Objective To investigate the effect of benazepril on intergrin-linked kinase (ILK) and α-smooth muscle actin (α-SMA) expression in glomerular mesangial cells induced by high-glucose.Methods The mesangial cells from SD rat (HBZY-1) were cultured conventionally and randomly divided into four groupsnormal glucose (D-glucose 5.5 mmol/L,group NG),mannitol-treated group (mannitol 20 mmol/L,group MG),high glucose (D-glucose 30 mmol/L,group HG),Benazepril-treated high glucose group (D-glucose 30 mmol/L + Benazepril 10 μmol/L,group ACEI).Cells from NG,MG,HG,ACEI gronps were harvested after 3,6,12,24,48 and 72 hours of treatment respectively.The mRNA expressions of ILK and α-SMA were detected by RT-PCR.The protein levels of ILK and α-SMA were detected by Western blotting and immunofluorescence.Results The expressions of ILK mRNA and protein in HG group were significantly increased compared with those in NG group (all P ＜ 0.05).The increased expressions of ILK and α-SMA in HG group were time-dependent and the expression reached the peak at 48 h (ILK,P ＜ 0.05) or 72 h (α-SMA,P ＜ 0.01).The expressions of ILK and α-SMA in ACEI group were lower than those in HG group (all P ＜ 0.01),but failed to rescue to the same level as those in NG.There was no significant differences of ILK expressions between MG group and NG group at the same time point (P ＞ 0.05).The expressions of α-SMA mRNA and protein in MG were higher than that in NG (P ＜ 0.05),which suggest that high osmotic pressure could cause the increasing of α-SMA.Conclusions Benazepril can decrease the expressions of ILK and α-SMA to inhibit the process of fibrosis in DN and mediate the phenotypic transformation of glomerular mesangial cells.The phenotypic transformation of glomerular mesangial cells in glucose may also depend on high osmotic pressure in DN.