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Purified sterol carrier protein2 (SCP2) from rat liver stimulated utilization of endogenous cholesterol for pregnenolone synthesis by adrenal mitochondria. Cytosolic preparations of rat liver, adrenal and luteinized ovary were also stimulatory in mitochondrial pregnenolone synthesis to different extents. Treatment of all preparations with rabbit anti-rat SCP2 IgG neutralized the stimulatory effects, and immunoprecipitated proteins gave similar patterns on SDS-gradient polyacrylamide gel electrophoresis. Treatment with rabbit pre-immune IgG had no effect on these parameters. Thus, proteins which are immunochemically compatible with hepatic SCP2 appear to be present in steroidogenic tissues and may play a role in control of mitochondrial cholesterol side chain cleavage activity.
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