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Abstract
Enzymically dispersed luteal cells obtained from PMSG-hCG-treated immature pseudopregnant rats were incubated with oxytocin and vasopressin. In response to increasing doses of hCG the rat luteal cells produced progesterone and accumulated intracellular cAMP in a dose-dependent manner. A neuropeptide GnRH agonist (4 X 10(-6) M) produced a significant inhibition of hCG-stimulated progesterone production and of accumulation of intracellular cAMP. However, neither the basal nor the hCG-stimulated rate of progesterone production and level of intracellular cAMP was affected by the neurohypophysial peptides tested. Therefore, it is concluded that oxytocin and vasopressin do not have a direct action on steroidogenesis by rat luteal cells.
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