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- W4254757487 abstract "Mice lacking steroid 5α-reductase 1 and 2 were produced by gene targeting and breeding. Male mice without 5α-reductase 2 or without both enzymes had fully formed internal and external genitalia and were fertile, but had smaller prostates and seminal vesicles than controls. T accumulated to high levels in the reproductive tissues of the mutant mice. DHT administration increased seminal vesicle and coagulating gland weights in mice deficient in 5α-reductase 2 and increased the weights of the prostate, seminal vesicle, and coagulating gland in animals deficient in both enzymes. An inhibitor of both 5α-reductases (GI 208335X) decreased prostate and coagulating gland weights of control mice, but had no effect in those lacking 5α-reductase 1 and 2. Castration reduced the sizes of these tissues in animals of all genotypes. Androgen-dependent gene expression was decreased in the seminal vesicles of mice lacking one or more 5α-reductases and was restored by administration of T or DHT. Female mice missing both enzymes exhibited parturition and fecundity defects similar to those of animals without 5α-reductase 1. We conclude that T is the only androgen required for differentiation of the male urogenital tract in mice and that the synthesis of DHT serves largely as a signal amplification mechanism." @default.
- W4254757487 created "2022-05-12" @default.
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- W4254757487 date "2001-11-01" @default.
- W4254757487 modified "2023-09-23" @default.
- W4254757487 title "Unexpected Virilization in Male Mice Lacking Steroid 5 -Reductase Enzymes" @default.
- W4254757487 doi "https://doi.org/10.1210/en.142.11.4652" @default.
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