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Endocrinology, Vol 137, 5337-5343, Copyright © 1996 by Endocrine Society

ARTICLES

Nitric oxide inhibits Leydig cell steroidogenesis

K Del Punta, EH Charreau and OP Pignataro
Instituto de Biologia y Medicina Experimental-Consejo Nacional de Investigaciones Cientificas y Tecnicas and Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.

Testicular macrophages as well as endothelial cells, which are intimately associated with Leydig cells, constitute a potential source of paracrine nitric oxide (NO) in the testis. In the present study, we investigated the effect of NO donors on MA-10 murine Leydig tumor cell line and rat Leydig cell steroidogenesis. We show that NO donors inhibit human CG-induced steroidogenesis in both type of cells. We also studied NO mechanism of action. Contrary to what is observed in many other systems, NO inhibitory effect on Leydig cell steroidogenesis is not mediated by cyclic GMP (cGMP) because NO fails to increase cGMP production, and cGMP analogs do not reproduce NO effect. NO does not modify the production of cAMP, the main second messenger that mediates gonadotropin action. When we studied NO effect over the steroidogenic pathway in MA-10 cells, we found that NO was inhibiting the conversion of cholesterol to pregnenolone. Taken together these results show an inhibitory effect of NO donors on Leydig cell steroidogenesis, and suggest that NO can be directly inhibiting cholesterol side-chain cleavage enzyme (cytochrome P450scc) as it does with other heme proteins, including different cytochromes P450.


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