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  • Title: Differential actions of phorbol ester and diacylglycerol on inhibition of granulosa cell maturation.
    Author: Shinohara O, Knecht M, Catt KJ.
    Journal: Biochem Biophys Res Commun; 1985 Dec 17; 133(2):468-74. PubMed ID: 3002344.
    Abstract:
    Hormonal induction of granulosa cell maturation is inhibited by phorbol esters and permeant synthetic diacylglycerols, but these activators of protein kinase C differ in their effects on cAMP production and actions. Both agents prevented the induction of luteinizing hormone receptors and progesterone biosynthesis by follicle-stimulating hormone, choleragen, and forskolin, but only diacylglycerol abolished the cAMP responses to these stimuli. Granulosa cell aggregation and aromatase activity were inhibited by phorbol ester but not completely by diacylglycerol. In intact granulosa cells, cytosolic C kinase activity was rapidly decreased by phorbol ester but unaffected by diacylglycerol. Although diacylglycerol has a marked inhibitory action on cAMP production, the more prominent suppression of granulosa cell differentiation by phorbol ester may be related to its rapid and prolonged action on kinase C.
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