Effects of procyanidins on cell apoptosis and the release of cytochrome C in human trabecular meshwork cells under oxidative stress / 眼科新进展

ABSTRACT

Objective To investigate the effect of procyanidins (PC) on cell apoptosis and cytochrome C releasing in human trabecular meshwork cells (HTMC) under oxidative stress induced by H2 O2.Methods HTMC were cultured and then divided randomly into 5 groups.Normal cultured HTMC served as normal group without treatment,and normal cultured HTMC in control group were treated with 500 μrnol · L-1 H2O2 for 1 h,as well as normal cells in treatment groups were treated with 500 imol · L-1 H2 O2 for 1 h combined with different concentrations of PC (0.02 g · L-1,0.05 g · L-1,0.10 g · L-1).Then flow cytometry and Western blot were applied to detect the cell apoptosis rate and the release of cytochrome C (CytC) respectively.Results Compared with the normal group,the apoptotic rates of the control group and the PC treatment groups were significantly increased,and the difference was statistically significant (all P ＜ 0.01).Compared with the control group,the apoptotic rates of the 3 PC treatment groups were decreased,and the differences were statistically significant (all P ＜ 0.01).Moreover,the apoptotic rate in 0.02 g · L-1,0.05 g · L-1,0.10 g · L-1 PC treatment groups was decreased as PC concentration increased,and the differences were statistically significant (all P ＜ 0.01).Furthermore,compared with the normal group,the release of cytochrome C in the control group,0.02 g · L-1 and 0.05 g · L-1 PC treatment group enhanced,and the differences were statistically significant (all P ＜ 0.01),but there was no significant difference between 0.01 g · L-1 PC treatment group and the normal group (P ＞ 0.05).Compared with the control group,the release of cytochrome C in the 3 PC treatment group was attenuated with significant differences (all P ＜0.01).Meanwhile,the release of cytochrome C was decreased in the 3 PC treatment groups with a concentration-dependent manner,and the pairwise differences were statistically significant (all P ＜ 0.01).Conclusion Exogenous PC can decrease the apoptotic rate of HTMC under oxidative stress and reduce the release of cytochrome C,as well as it also has an antioxidant effect in a certain concentration-dependent manner.