title: Postprandial lipemia enhances the capacity of large HDL2 particles to mediate free cholesterol efflux via SR-BI and ABCG1 pathways in type IIB hyperlipidemia.
abstract: Lipid and cholesterol metabolism in the postprandial phase is associated with both quantitative and qualitative remodeling of HDL particle subspecies that may influence their anti-atherogenic functions in the reverse cholesterol transport pathway. We evaluated the capacity of whole plasma or isolated HDL particles to mediate cellular free cholesterol (FC) efflux, cholesteryl ester transfer protein (CETP)-mediated cholesteryl ester (CE) transfer, and selective hepatic CE uptake during the postprandial phase in subjects displaying type IIB hyperlipidemia (n = 16). Postprandial, large HDL2 displayed an enhanced capacity to mediate FC efflux via both scavenger receptor class B type I (SR-BI)-dependent (+12%; P < 0.02) and ATP binding cassette transporter G1 (ABCG1)-dependent (+31%; P < 0.008) pathways in in vitro cell systems. In addition, the capacity of whole postprandial plasma (4 h and 8 h postprandially) to mediate cellular FC efflux via the ABCA1-dependent pathway was significantly increased (+19%; P < 0.0003). Concomitantly, postprandial lipemia was associated with elevated endogenous CE transfer rates from HDL2 to apoB lipoproteins and with attenuated capacity (-17%; P < 0.02) of total HDL to deliver CE to hepatic cells. Postprandial lipemia enhanced SR-BI and ABCG1-dependent efflux to large HDL2 particles. However, postprandial lipemia is equally associated with deleterious features by enhancing formation of CE-enriched, triglyceride-rich lipoprotein particles through the action of CETP and by reducing the direct return of HDL-CE to the liver.
authors: Institut National de la Santé et de la Recherche Médicale (INSERM) UMRS939, Hôpital de la Pitié, Paris, France.
authors: Zélie
authors: Z
authors: Julia
authors: Emilie
authors: E
authors: Duchene
authors: Natalie
authors: N
authors: Fournier
authors: Natacha
authors: N
authors: Bellanger
authors: M John
authors: MJ
authors: Chapman
authors: Wilfried
authors: W
authors: Le Goff
authors: Maryse
authors: M
authors: Guerin
mesh_terms: D000070998:ATP Binding Cassette Transporter, Subfamily G, Member 1; D018528:ATP-Binding Cassette Transporters / Q000378:metabolism*; D000328:Adult; D001692:Biological Transport; D018955:CD36 Antigens / Q000378:metabolism*; D002784:Cholesterol / Q000378:metabolism*; D002788:Cholesterol Esters / Q000378:metabolism; D005260:Female; D006801:Humans; D006949:Hyperlipidemias / Q000097:blood / Q000378:metabolism* / Q000473:pathology / Q000503:physiopathology; D007700:Kinetics; D053439:Lipoproteins, HDL2 / Q000097:blood / Q000737:chemistry / Q000378:metabolism*; D008099:Liver / Q000166:cytology / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D010316:Particle Size; D019518:Postprandial Period; D014280:Triglycerides / Q000097:blood
chemical_list: C419353:ABCG1 protein, human; D000070998:ATP Binding Cassette Transporter, Subfamily G, Member 1; D018528:ATP-Binding Cassette Transporters; D018955:CD36 Antigens; D002788:Cholesterol Esters; D053439:Lipoproteins, HDL2; D014280:Triglycerides; D002784:Cholesterol