Cholesterol efflux from cultured adipose cells is mediated by LpAI particles but not by LpAI:AII particles - PubMed (original) (raw)
Cholesterol efflux from cultured adipose cells is mediated by LpAI particles but not by LpAI:AII particles
R Barbaras et al. Biochem Biophys Res Commun. 1987.
Abstract
Cholesterol efflux was studied in cultured adipose cells after preloading with LDL cholesterol. Long-term exposure to LpAI and LpAI:AII particles isolated from the HDL fraction showed that LpAI particles only were able to promote cholesterol efflux. Liposomes containing different ApoAI/ApoAII molar ratios were tested: the larger the proportion of ApoAI, the faster the ability to remove cholesterol from Ob1771 cells. Dose-response curves showed that LpAI particles were active within a physiological range of concentrations, whereas LpAI:AII particles had no effect at all concentrations. The results are in favour of LpAI particles being the active components of the HDL fraction for the promotion of cholesterol efflux and suggest that LpAI particles and LpAI:AII particles represent distinct metabolic entities.
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