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Journal of Lipid Research, Vol 38, 734-744, Copyright © 1997 by Lipid Research, Inc.

ARTICLES

Modification of the cholesterol efflux properties of human serum by enrichment with phospholipid

B Jian, M de la Llera-Moya, L Royer, G Rothblat, O Francone and JB Swaney
Department of Biochemistry, Allegheny University of the Health Sciences, Philadelphia, PA 19129, USA.

To investigate the importance of phospholipid in promoting cholesterol efflux from cells, phospholipid multilamellar vesicles were incubated with normal human serum and the efflux ability of these lipid-modified sera was tested. When incubated under appropriate conditions, both dimyristoylphosphatidylcholine (DMPC) and bovine brain sphingomyelin (BBSM) were shown to combine with components of human serum to form new protein:lipid complexes and to markedly enhance the ability of serum to promote efflux of cholesterol from Fu5AH cells. In particular, the high density lipoprotein (HDL) particles were altered in their composition and electrophoretic properties and the alpha-migrating species, which were reactive with antibodies to apo-A-I, were converted to larger, pre- beta-migrating particles, similar in electrophoretic properties to pre beta(2)-HDL. DMPC, but not BBSM, also generated particles with mobility similar to pre beta(2)-HDL; These species were demonstrably different from the discoidal complexes formed by reaction of DMPC with purified apoA-I. However, no change in cholesterol efflux potential was observed when serum was mixed with phospholipids that failed to interact or when cells were incubated with phospholipid multilamellar vesicles alone. To further identify the components of serum that become altered in their efflux potential after reaction with phospholipid, isolated lipoprotein fractions were incubated with DMPC or BBSM and it was found that only interaction with HDL caused enhancement of cholesterol efflux. In summary, cholesterol removal from the Fu5AH cells by serum can be promoted by adding phospholipid under conditions where new HDL-like complexes can be formed between the phospholipid and serum components, most notably apolipoprotein A-I.
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