Aim To investigate the effect of diosgenin(Dgn) on ABCA1 expression and cholesterol efflux in THP-1 derived macrophage. Methods ABCA1 expression was detected by Western blot. Cholesterol efflux was detected with liquid scintillator; intracellular total cholesterol(TC),free cholesterol(FC) and cholesterol ester(CE) were determined with HPLC; and intracellular lipid droplet was stained with oil red O in THP-1-derived macrophage treated with Dgn,alone or in combination with ABCA1 siRNA. Results Dgn upregulated...