Estrogens and progesterone increase fetal and maternal guanylate cyclase activity

Endocrinology
D L Vesely, D E Hill

Abstract

Since both estrogens and cyclic guanosine 3',5'-monophosphate stimulate protein synthesis, the objective of the present investigation was to determine if estrogens and their precursors might have part of their mechanism of action through stimulation of guanylate cyclase (E.C.4.6.1.2), the enzyme that catalyzes the conversion of guanosine triphosphate to cyclic guanosine 3',5'-monophosphate. The precursors of estrogen synthesis originate from cholesterol. Cholesterol itself had no effect on guanylate cyclase activity. The precursors of estrogen synthesis generated from cholesterol, namely, progesterone, 17 alpha-OH-progesterone, androstenedione, pregnenolone, 17 alpha-OH-pregnenolone, and dehydroepinandrosterone, however, caused a 2- to 3-fold enhancement of fetal and maternal guinea pig hepatic and uterine guaynlate cyclase activity at a concentration of 1 microM. In comparative studies, similar effects were seen on immature female Sprague-Dawley rat hepatic and uterine guanylate cyclase activity. Estrone, estradiol-17 beta, estriol, and the synthetic estrogen, diethylstilbestrol, enhanced guanylate cyclase activity in the same tissues 2- to 3- fold at the 1 microM concentration. Dose-response relationships revealed that these ...Continue Reading

Citations

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