Aim To analyze the DNA demethylation effect of 5-aza-2’-deoxycytidine( 5-Aza-CdR) on the expression of apolipoprotein A( ApoA) and its mechanisms in HepG 2 cells. Methods HepG 2 cells,high ApoA expression cell lines,were selected for our study. 1In order to get an appropriate drug concentration and effect time,HepG 2cells were treated with different concentration( 0,10,20,40,80 μmol / L) and different time( 12,24,48,72,96 h),then the relative survival ratio of HepG 2 cells were detected by methyl thiazolyl tetrazolium( MTT) method. ...