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J Biol Chem, Vol. 273, Issue 47, 31002-31008, November 20, 1998
From the Departments of Internal Medicine and Molecular Genetics,
University of Texas Southwestern Medical Center,
Dallas, Texas 75235
Scavenger receptor, class B, type I (SR-BI) is a
cell surface glycoprotein that mediates selective uptake and efflux of
sterols from high density lipoproteins (HDL) to cells. A Chinese
hamster ovary cell line that is deficient in functional LDL receptors, but has high expression levels of recombinant SR-BI (ldlA7-SR-BI), was
used to examine the effect of SR-BI on the trafficking of sterols
between lipoproteins and cells. To monitor the fate of sterols
transported by SR-BI into cells, we measured the incorporation of
[14C]oleate into cholesterol esters by
acyl-CoA:cholesteryl acyltransferase in the endoplasmic reticulum. We
show that incubation of ldlA7-SRBI cells with either LDL or HDL
resulted in an equally dramatic increase in the formation of
[14C]oleate-labeled cholesterol esters. The
lipoprotein-stimulated, SR-BI-dependent increase in
cholesterol esterification was inhibited by chloroquine. The uptake of
sterols and their incorporation into cholesterol esters by SR-BI from
LDL was largely a selective process. The addition of free cholesterol
to ldlA7-SRBI cells also stimulated cholesterol ester formation in a
chloroquine-sensitive fashion. We also show that SR-BI mediates the
efflux of endogenously synthesized sterols from the cell membrane. From
these studies we conclude that, in the absence of the LDL receptor,
overexpression of SR-BI can mediate significant transport of sterols
between lipoproteins and the endoplasmic reticulum of cells.
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