Volume 272, Number 11, Issue of March 14, 1997 pp. 6959-6964
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

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Phospholipid Transfer Protein Mediates Transfer of not Only Phosphatidylcholine but Also Cholesterol from Phosphatidylcholine-Cholesterol Vesicles to High Density Lipoproteins

(Received for publication, October 18, 1996, and in revised form, December 17, 1996)

From the Burnsides Research Laboratory, Department of Food Science and Human Nutrition, University of Illinois, Urbana, Illinois 61801

Phospholipid transfer protein (PLTP) purified from human plasma was found to enhance the transfer of cholesterol from single bilayer vesicles containing phosphatidylcholine and cholesterol to high density lipoprotein-3. The rate of cholesterol transfer was greatly influenced by the cholesterol content of the donor vesicles. The maximal rate was observed with the vesicles containing 20-25 mol % cholesterol. This was in contrast to a progressive decline in the rate of phosphatidylcholine transfer with an increase in the cholesterol content. To determine the binding of cholesterol and phosphatidylcholine to PLTP, the mixtures of PLTP and the vesicles containing ³H-labeled phosphatidylcholine and ¹⁴C-labeled cholesterol were incubated and subjected to sucrose density gradient centrifugation. Determination of the label profiles showed that cholesterol as well as phosphatidylcholine were transferred from the vesicles to PLTP. The reversible nature of the binding was shown by the transfer of labeled cholesterol and phosphatidylcholine bound to PLTP to the acceptor vesicles or low density lipoprotein. Isothermal equilibrium binding of PLTP for cholesterol and phosphatidylcholine showed that PLTP possessed a considerably higher affinity and binding capacity for phosphatidylcholine than for cholesterol. The phosphatidylcholine binding affinity and capacity were greater when PLTP was incubated with phosphatidylcholine vesicles without cholesterol. A possible importance of PLTP-mediated cholesterol transfer in the circulation was described.

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