PMID: 11932209Apr 5, 2002Paper

Differential regulation of aldosterone synthase and 11beta-hydroxylase transcription by steroidogenic factor-1

Journal of Molecular Endocrinology
Mary H BassettW E Rainey

Abstract

11beta-Hydroxylase (hCYP11B1) and aldosterone synthase (hCYP11B2) are closely related isozymes with distinct roles in cortisol and aldosterone production respectively. Aldosterone synthase catalyzes the final step in aldosterone biosynthesis and is expressed only in the zona glomerulosa of the normal adrenal. 11beta-Hydroxylase catalyzes the final reaction in the production of cortisol and is expressed at higher levels in the zona fasciculata. The mechanisms causing differential expression of these genes are not well defined. Herein, we demonstrate contrasting roles for the orphan receptor steroidogenic factor-1 (SF-1) in the regulation of human (h) CYP11B1 and hCYP11B2. Human NCI-H295R (H295R) or mouse Y-1 cells were transiently transfected with luciferase reporter constructs containing 5'-flanking regions of hCYP11B1, hCYP11B2, human 17alpha-hydroxylase (hCYP17), human cholesterol side-chain cleavage (hCYP11A1) or mouse (m) cyp11b2 (mcyp11b2). Co-transfection of vectors encoding SF-1 increased expression of hCYP11B1, hCYP11A1 and hCYP17 constructs, but inhibited hCYP11B2 reporter activity. Murine, bovine and human SF-1 were unable to increase transcription of hCYP11B2 in H295R cells. Both hCYP11B2 and mcyp11b2 promoter constr...Continue Reading

Citations

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