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Hormone-Sensitive Lipase Is Required for High-Density Lipoprotein Cholesteryl Ester-Supported Adrenal Steroidogenesis

Veterans Affairs Palo Alto Health Care System (F.B.K., S.A.), Palo Alto, California 94304; Department of Medicine (F.B.K., W.-J.S., K.H., S.P.), Stanford University, Stanford, California 94305; Department of Metabolic Disease (J.-i.O.), University of Tokyo, Tokyo 113, Japan; and Department of Internal Medicine (S.I.), Jichi Medical School, Tochigi 329-0498, Japan

Address all correspondence and requests for reprints to: Fredric B. Kraemer, M.D, Division of Endocrinology, S-005, Stanford University, Stanford, California 94305-5103. E-mail: fbk{at}stanford.edu.

Steroid hormones are synthesized using cholesterol as precursor, with a substantial portion supplied by the selective uptake of lipoprotein-derived cholesteryl esters. Adrenals express a high level of neutral cholesteryl ester hydrolase activity, and recently hormone-sensitive lipase (HSL) was shown to be responsible for most adrenal neutral cholesteryl ester hydrolase activity. To determine the functional importance of HSL in adrenal steroidogenesis, adrenal cells were isolated from control and HSL-/- mice, and the in vitro production of corticosterone was quantified. Results show that, even though adrenal cholesteryl ester content was substantially elevated in both male and female HSL-/- mice, basal corticosterone production was reduced approximately 50%. The maximum corticosterone production induced by dibutyryl cAMP, and lipoproteins was approximately 75–85% lower in adrenal cells from HSL-/- mice compared with control. There is no intrinsic defect in the conversion of cholesterol into steroids in HSL-/- mice. Dibutyryl cAMP-stimulated conversion of high-density lipoprotein cholesteryl esters into corticosterone was reduced 97% in HSL-/- mice. An increase in low-density lipoprotein receptor expression appears to be one of the compensatory mechanisms for cholesterol delivery in HSL-/- mice. These findings suggest that HSL is functionally linked to the selective pathway and is critically involved in the intracellular processing and availability of cholesterol for adrenal steroidogenesis.

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