Abstract
Observations of patients deficient in the steroidogenic enzyme 3 beta-hydroxy-delta 5-steroid dehydrogenase/isomerase (3 beta HSD) have suggested the presence of distinct 3 beta HSD structural gene(s) that are expressed at peripheral sites, possibly the liver. We now report the isolation of cDNA clones representing three forms of 3 beta HSD from mouse Leydig cell and liver libraries. The three forms share significant identify but differ from each other by 5-10% within their coding regions. RNA that hybridizes to radiolabeled 3 beta HSD probes is present in the gonads, adrenal glands, liver, and kidneys of both sexes. Ribonuclease protection analysis using antisense probes derived from each of the three forms demonstrates that one form, 3 beta HSD I, is restricted to steroidogenic tissues. Two other forms, 3 beta HSD II and III, are expressed in liver and kidney but are not detected in steroidogenic tissues. A polyclonal antibody raised against the human placental form of 3 beta HSD recognizes a 42-kDa protein in gonadal and adrenal tissue and a 45-kDa protein in liver. The antibody recognizes a 42-kDa protein in kidney only weakly. 3 beta HSD enzyme activity is present in testicular, adrenal, hepatic, and renal tissue, with adrenal tissue possessing the highest specific activity. When expressed as total 3 beta HSD activity for whole organ mass, activity is greatest in the liver. The results demonstrate that the mouse liver is a significant site of 3 beta HSD activity and demonstrate the existence of multiple 3 beta HSD structural genes in the mouse.
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