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- W2000068032 abstract "Abstract The reciprocal control of nonapeptide hormone (oxytocin, vasopressin) and cyclic nucleotide (cAMP, cGMP) release by porcine granulosa cells was studied. In particular, the influence of vasopressin and oxytocin treatment (10–10 000 ng/ml) on basal and LH-induced cAMP and cGMP output, as well as the effects of dibutyryl cAMP (dbcAMP; cAMP analogue) and forskolin (a stimulator of cAMP formation; 0·1–1000 ng/ml) on vasopressin and oxytocin secretion by cultured porcine granulosa cells were examined. It was observed that the addition of arginine-8-vasopressin or oxytocin stimulated both cAMP and cGMP output from granulosa cells. Moreover, both vasopressin and oxytocin also increased LH-stimulated cAMP and cGMP release. On the other hand, both dbcAMP and forskolin decreased vasopressin secretion. Oxytocin release was stimulated under the influence of dbcAMP. The same stimulating effect occurred with forskolin given at a low dose (1 ng/ml), whilst higher doses of forskolin (10 or 1000 ng/ml) were inhibitory. The present observations demonstrate the reciprocal influence of nonapeptide hormones and cyclic nucleotides in porcine ovarian cells. Oxytocin and vasopressin, like LH, exert their action on the ovary via the activation of cAMP- and cGMP-dependent intracellular mechanisms. cAMP in turn inhibits vasopressin release through a negative feedback mechanism. On the other hand, a reciprocal stimulation of oxytocin and cAMP output in granulosa cells is suggested. Thus, cyclic nucleotides can be both regulators of nonapeptide hormone secretion and mediators of their action within porcine ovaries. Journal of Endocrinology (1996) 150, 343–348" @default.
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- W2000068032 date "1996-08-01" @default.
- W2000068032 modified "2023-09-27" @default.
- W2000068032 title "Inter-relationships between nonapeptide hormones and cyclic nucleotides within cultured porcine granulosa cells" @default.
- W2000068032 doi "https://doi.org/10.1677/joe.0.1500343" @default.
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