Calpains are ubiquitous non-lysosomal Ca2+-dependent cysteine proteases also present in myocardial cytosol and mitochondria.Numerous experimental studies reveal an essential role of the calpain system in myocardial in...Calpains are ubiquitous non-lysosomal Ca2+-dependent cysteine proteases also present in myocardial cytosol and mitochondria.Numerous experimental studies reveal an essential role of the calpain system in myocardial injury during ischemia,reperfusion and postischemic structural remodelling.The increasing Ca2+-content and Ca2+-overload in myocardial cytosol and mitochondria during ischemia and reperfusion causes an activation of calpains.Upon activation they are able to injure the contractile apparatus and impair the energy production by cleaving structural and functional proteins of myocytes and mitochondria.Besides their causal involvement in acute myocardial dysfunction they are also involved in structural remodelling after myocardial infarction by the generation and release of proapoptotic factors from mitochondria.Calpain inhibition can prevent or attenuate myocardial injury during ischemia,reperfusion,and in later stages of myocardial infarction.展开更多
The purpose of this study was to investigate the effect of inhibition of calpain on retinal ganglion cell-5（RGC-5） necroptosis following oxygen glucose deprivation（OGD）. RGC-5 cells were cultured in Dulbecco＇s-mo...The purpose of this study was to investigate the effect of inhibition of calpain on retinal ganglion cell-5（RGC-5） necroptosis following oxygen glucose deprivation（OGD）. RGC-5 cells were cultured in Dulbecco＇s-modified essential medium and necroptosis was induced by 8-h OGD. PI staining and flow cytometry were performed to detect RGC-5 necrosis. The calpain expression was detected by Western blotting and immunofluorescence staining. The calpain activity was tested by activity detection kit. Flow cytometry was used to detect the effect of calpain on RGC-5 necroptosis following OGD with or without N-acetyl-leucyl-leucyl-norleucinal（ALLN） pre-treatment. Western blot was used to detect the protein level of truncated apoptosis inducing factor（t AIF） in RGC-5 cells following OGD. The results showed that there was an up-regulation of the calpain expression and activity following OGD. Upon adding ALLN, the calpain activity was inhibited and t AIF was reduced following OGD along with the decreased number of RGC-5 necroptosis. In conclusion, calpain was involved in OGD-induced RGC-5 necroptosis with the increased expression of its downstream molecule t AIF.展开更多
文摘Calpains are ubiquitous non-lysosomal Ca2+-dependent cysteine proteases also present in myocardial cytosol and mitochondria.Numerous experimental studies reveal an essential role of the calpain system in myocardial injury during ischemia,reperfusion and postischemic structural remodelling.The increasing Ca2+-content and Ca2+-overload in myocardial cytosol and mitochondria during ischemia and reperfusion causes an activation of calpains.Upon activation they are able to injure the contractile apparatus and impair the energy production by cleaving structural and functional proteins of myocytes and mitochondria.Besides their causal involvement in acute myocardial dysfunction they are also involved in structural remodelling after myocardial infarction by the generation and release of proapoptotic factors from mitochondria.Calpain inhibition can prevent or attenuate myocardial injury during ischemia,reperfusion,and in later stages of myocardial infarction.
基金supported by grants from National Natural Science Foundation of China(No.81371011,and No.81571939)Wu Jie-Ping Medical Foundation of the Minister of Health of China(No.320.6750.14118)+3 种基金Natural Science Foundation of Hunan Province(No.2015JJ2187)Teacher Research Foundation of Central South University(No.2014JSJJ026)Science Foundation for the Youth Scholars of Central South University(No.120973)Project of Innovation-driven Plan of Central South University(No.2015CXS022)
文摘The purpose of this study was to investigate the effect of inhibition of calpain on retinal ganglion cell-5（RGC-5） necroptosis following oxygen glucose deprivation（OGD）. RGC-5 cells were cultured in Dulbecco＇s-modified essential medium and necroptosis was induced by 8-h OGD. PI staining and flow cytometry were performed to detect RGC-5 necrosis. The calpain expression was detected by Western blotting and immunofluorescence staining. The calpain activity was tested by activity detection kit. Flow cytometry was used to detect the effect of calpain on RGC-5 necroptosis following OGD with or without N-acetyl-leucyl-leucyl-norleucinal（ALLN） pre-treatment. Western blot was used to detect the protein level of truncated apoptosis inducing factor（t AIF） in RGC-5 cells following OGD. The results showed that there was an up-regulation of the calpain expression and activity following OGD. Upon adding ALLN, the calpain activity was inhibited and t AIF was reduced following OGD along with the decreased number of RGC-5 necroptosis. In conclusion, calpain was involved in OGD-induced RGC-5 necroptosis with the increased expression of its downstream molecule t AIF.
