[Objective]To determine the cholesterol effiux efficacy of high density lipoprotein （HDL） by using established maemphage-defived foam cell model from human monoeytie U937 cell line. [Methods] U937 ceils were incubated with 100 μg/mL oxidized low density lipopretein for 36 hours. The eholesterel-loaded U937 cells were treated with different concentrations of high density lipopretein for more 24 h. High performance liquid ehro-- matography （HPLC） was used for qualitative and quantitative analysis of intraeellular cholesterol and cholesterol ...
