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Old 09-16-2018, 08:50 AM
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rss Effect of glucocorticoids on androgen biosynthesis in the testes of the toad Rhinella

Related Articles Effect of glucocorticoids on androgen biosynthesis in the testes of the toad Rhinella arenarum (Amphibia, Anura).

J Exp Zool A Ecol Integr Physiol. 2018 Sep 15;:

Authors: Czuchlej SC, Volonteri MC, Regueira E, Ceballos NR

Abstract
In rat Leydig cells, glucocorticoids (GCs) inhibit testosterone production through the interaction with the glucocorticoid receptor (GR). However, the sensitivity of those cells to GCs is regulated by the enzyme 11?-hydroxysteroid dehydrogenase Type 1 (11?-HSD1). In the testes of the toad Rhinella arenarum, the presence of an 11?-HSD similar to type 2 and a cytosolic GR has also been described. However, there is a lack of information regarding the effects of GCs on amphibian testicular steroidogenesis. In this study, the effects of corticosterone on androgen production, and the activity of two steroidogenic enzymes in toad testes were reported. Corticosterone inhibits androgen production via the GR because the GR antagonist RU486 prevents corticosterone-induced inhibition of testosterone. Corticosterone also reduced the activity of the cytochrome P450 17-hydroxylase, C17,20-lyase (Cyp450 c17 ) without affecting the 3?-hydroxysteroid dehydrogenase/isomerase activity. This effect on Cyp450 c17 was likewise inhibited by RU486. On the other hand, corticosterone had no effect on the amount of steroidogenic acute regulator protein. These results suggest that GCs inhibit steroidogenesis in toad testes by reducing of Cyp450 c17 activity via a GR-mediated mechanism.


PMID: 30218550 [PubMed - as supplied by publisher]



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