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“ Suramin inhibited the production of testosterone by isolated rat Leydig cells as well as the conversion of pregnenolone to progesterone by the 3 beta-hydroxysteroid dehydrogenase enzyme extracted from rat testes, with 50% inhibitory concentrations (IC50 values) of 108.2 and 87.5 micrograms/mL, respectively.”
The Journal of clinical endocrinology and metabolism • 1996 | View Paper
“The addition of suramin , previously reported to inhibit autocrine growth stimulation, accelerate the daily progesterone production of luteal cells apparently by switching on the early onset of differentiation.”
The Tohoku journal of experimental medicine • 1992 | View Paper
“In addition, suramin caused a parallel decrease in ACTH-stimulated pregnenolone, progesterone and corticosterone release, suggesting that suramin does not affect corticosteroidogenesis via an inhibition of its regulatory enzymes.”