ABSTRACT
Objective To investigate the effect of autophagy on the apoptosis of H 9C2 cardiomyocytes.Methods H9C2 cardiomyocytes were incubated with different concentrations of high glucose and high lipids ( HGHL ) for different time.The surface area of cardiomyocytes was measured after HE staining .The cell viability and apoptotic rate were measured by flow cytometry.Western blot was used to detect the expression levels of LC3Ⅱ, p62, Beclin-1,LAMP2 and cleaved caspase-3.Results After treatment with HGHL, the cells appeared hypertrophy in a concentration-and time-dependent manner , the cell hypertrophy was most obvious under the condition of HGHL(500 μmol/L,36 h)(P<0.001).Cell apoptosis increased in a concentration-and time-dependent manner, the apoptotic rate was nearly 50%under the condition of HGHL ( 500 μmol/L,36 h) ( P<0.001 ) .After treatment with HGHL for 24 h, compared with the control group , the expression of LC3Ⅱ was very significantly increased ( P<0.01) , the expression of Beclin-1 and LAMP 2 were significantly decreased ( P<0.05) , but the expression of p 62 was significantly increased ( P<0.01 ) .Compared with the control group and the intervention group , the expression of cleaved caspase-3 was significantly increased ( P<0.01 ) after 1 h of chloroquine pretreatment .Conclusions HGHL induced H9C2 cardiomyocytes hypertrophy promote H 9C2 cardiomyocytes apoptosis in a concentration-and time-dependent manner .HGHL may inhibit autophagy formation and degradation of H 9C2 cardiomyocytes at the same time , leading to abnormal autophagy accumulation of cardiomyocytes , and promote apoptosis , suggesting that inhibition of autophagy may be an important cause for promote apoptosis .