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Regulation of gonadotropin secretion in male mice from birth to adulthood response to lhrh injection castration and testosterone replacement therapy


, : Regulation of gonadotropin secretion in male mice from birth to adulthood response to lhrh injection castration and testosterone replacement therapy. Acta Endocrinologica 110(2): 193-199

Plasma LH and FSH concentrations were determined by radioimmunoassay in male mice from birth to adulthood after LRH injection, castration and testosterone replacement therapy. Except at birth for LH, LRH significantly increased circulating levels of both gonadotrophins at all stages studied. It is suggested that a change in the pituitary LH response to LRH occurs around puberty and perhaps represents the time of initiation of pubertal processes. At all stages studied (except the infantile stage for LH) castration resulted in a significant rise in circulating LH and FSH levels. The magnitude of LH response to castration increased with age but not that of FSH. Testoserone replacement therapy, inducing supra-physiological circulating testosterone levels, was ineffective to depress the post-castration rises of LH and FSH levels.

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