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The Journal of Lipid Research, Vol. 39, 1616-1628, August 1998
Copyright © 1998 by Lipid Research, Inc.

Original Article

Simultaneous induction of an HDL receptor protein (SR-BI) and the selective uptake of HDL-cholesteryl esters in a physiologically relevant steroidogenic cell model

Salman Azhara, Ann Nomotoa, Susan Leers-Suchetaa, and Eve Reavena
a Geriatric Research, Education, and Clinical Center, VA Palo Alto Health Care System, Palo Alto, CA, 94304

Correspondence to: Salman Azhar.

This study addresses the question of whether the level of expression of SR-BI (an HDL receptor) is linked to the expression of selective lipoprotein-cholesteryl ester delivery in a steroidogenic cell model. Rat ovarian granulosa cells are physiologically normal cells which show no selective uptake of HDL-cholesteryl esters and no progestin production until luteinized by trophic hormones or adenylate cyclase stimulators, after which expression of the selective cholesterol pathway and production of steroid hormone is dramatically up-regulated. The current study demonstrates that at every cell stage studied, the protein content and level of expression of SR-BI mRNA are linked to changes that occur in HDL-cholesteryl ester uptake; i.e., SR-BI is not present in basal (non-luteinized) cells, develops slowly (from 6–9 h) after hormone treatment, increases robustly from 9–48 h after stimulation, and remains high after incubation with HDL. In contrast, another structural protein, caveolin, did not follow this pattern; caveolin expression showed an inverse relationship to selective cholesteryl ester uptake, and was most prominent in basal cells and least prominent in luteinized, HDL-incubated cells. Morphologically, SR-BI appears to be associated with cell surface sites showing high levels of cholesteryl ester uptake (after luteinization and/or incubation with HDL labeled with fluorescent cholesteryl esters), and at the electron microscope level, SR-BI is most clearly associated with microvillar regions on the cell surface which also bind HDL-labeled with colloidal gold.

Thus, induction of the SR-BI receptor system and induction of the HDL-selective cholesterol uptake pathway in rat granulosa cells appear to be linked morphologically, biochemically, and functionally.—Azhar, S., A. Nomoto, S. Leers-Sucheta, and E. Reaven. Simultaneous induction of an HDL receptor protein (SR-BI) and the selective uptake of HDL-cholesteryl esters in a physiologically relevant steroidogenic cell model. J. Lipid Res. 1998. 39: 1616–1628.

Supplementary key words: HDL receptor, scavenger receptor, SR-BI, caveolin, selective cholesterol uptake, rat ovary steroidogenic cells, microvillar channels


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