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Molecular Endocrinology, Vol 10, 380-392, Copyright © 1996 by Endocrine Society
ARTICLES |
MS Mahendroo, KM Cala and DW Russell
Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas 75235-9046, USA.
Two steroid 5 alpha-reductase isozymes designated type 1 and 2 synthesize 5 alpha-reduced androgens and other 5 alpha-reduced steroid hormones. Naturally occurring mutations in the gene encoding 5 alpha- reductase type 2 cause male pseudohermaphroditism, indicating that this isozyme is responsible for the synthesis of dihydrotestosterone required for virilization of the embryonic male urogenital tract. To determine the physiological role of 5 alpha-reductase type 1, homologous recombination in mouse embryonic stem cells was used to produce male and female mice with a disruption (null allele) in the type 1 gene (Srd5a1). Male mice lacking 5 alpha-reductase type 1 appear normal. Females exhibit a parturition defect that is maternal in origin. The parturition defect is reversed by administration of 5 alpha- androstan-3 alpha, 17 beta-diol (3 alpha-Adiol), a 5 alpha-reduced androgen previously thought to be a breakdown product. Enzymes that synthesize 3 alpha-Adiol, including 5 alpha-reductase type 1 and 3 alpha-hydroxysteroid dehydrogenase, are induced in wild type uterus during late gestation. Induction leads to peak circulating levels of 3 alpha-Adiol on days 17/18 of gestation in wild type but not mutant mice. The results document a role for 5 alpha-reduced androgens synthesized by the type 1 isozyme in normal female physiology, and they suggest that 3 alpha-Adiol is a new hormone required for parturition in mice.
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