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Testosterone and GHRH gene expression in adult and old rats
V De Gennaro Colonna1, D Cocchi, L Lima
1Department of Pharmacology, Chemotherapy and Toxicology, University of Milan, Italy.
Peptides
|March 1, 1991
Abstract:
The effect of castration and testosterone replacement on GHRH gene expression was evaluated in adult male rats. Castration for 21 days did not affect GHRH mRNA levels, and also ineffective in this context was acute or chronic administration of testosterone to castrated rats. Hypothalamic GHRH mRNA was significantly reduced in aged male rats, but restoration of plasma testosterone concentrations via implanted capsules did not modify the low levels of GHRH mRNA. All in all, these findings support the notion that in adult and aged male rats GHRH-producing structures are insensitive to androgens.