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• W2000554677 abstract "In ovarian follicles of Rana pipiens, frog pituitary homogenates (FPH) elevate intrafollicular progesterone levels which in turn is thought to induce meiotic resumption in the prophase I arrested oocytes. Calcium plays a role in FPH and steroid-provoked responses in the somatic and gametic components of the follicle, presumably via effects exerted at the plasma membrane of their respective target cells. Many membrane active hormones which utilize Ca2+ in their intracellular transduction also provoke membrane phosphoinositide hydrolysis yielding inositol triphosphate (IP3) and diacyl glycerol (DAG), an activator of the CA2+-dependent protein kinase C (PKC). The actions of phorbol 12-myristate 13-acetate (TPA), a potent synthetic activator of PKC, on progesterone production and oocyte maturation was examined in in vitro cultured ovarian follicles. TPA induced germinal vesicle breakdown (GVBD) in intact follicles and in oocytes denuded of somatic components, while the inactive compound phorbol 13-monoacetate was ineffective. Further, TPA induction of GVBD exhibited similarities to progesterone-induced GVBD, being inhibited by treatments which elevate cAMP or inhibit protein synthesis. TPA alone did not elevate intrafollicular or medium progesterone levels, as occurred in FPH-treated follicles. TPA partially inhibited intrafollicular progesterone accumulation induced by FPH or treatments which elevate cAMP levels. These data suggest that activation of PKC plays a role in oocyte maturation independent of follicular progesterone production as occurs in response to FPH. Further, it appears that the somatic cells of the amphibian follicle also possess PKC which when activated, antagonizes cAMP generating pathway in these cells. Results indicate that protein kinase can influence oocyte maturation in Rana follicular oocytes by several mechanisms." @default.
• W2000554677 created "2016-06-24" @default.
• W2000554677 creator A5068212463 @default.
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• W2000554677 date "1988-11-01" @default.
• W2000554677 modified "2023-09-26" @default.
• W2000554677 title "Role of protein kinase C activation in oocyte maturation and steroidogenesis in ovarian follicles ofRana pipiens: Studies with phorbol 12-myristate 13-acetate" @default.
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• W2000554677 doi "https://doi.org/10.1002/mrd.1120210313" @default.
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