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- W2012947562 abstract "A reproducible method for dissociation and culture of rat luteal cells is described. The concentration of LH required to produce half-maximal stimulation of progesterone secretion was 50 ng/ml. The effects of prostaglandin E(2) (PGE(2)) and prostaglandin F(2alpha) (PGF(2alpha)) on basal and luteinizing hormone (LH)-stimulated progesterone production were examined. Both prostaglandins stimulated basal progesterone production but PGE(2) was about twice as active, showing a 2-fold maximal stimulation at 0.75 muM. When either prostaglandin was incubated simultaneously with LH, a dose-dependent inhibition of progesterone secretion occurred; PGF(2alpha) was 4 times more active than PGE(2), showing 50% inhibition at a concentration of 40 x nM. Thus, both prostaglandins are more active as antagonists than as agonists of LH with respect to progesterone secretion. PGF(2alpha) also inhibited LH-stimulated adenylate cyclase activity and cyclic AMP accumulation. The block in progesterone secretion was reversed by addition of dibutyryl cyclic AMP (1 mM) but not by theophylline (5 mM) alone. These data and the finding that PGF(2alpha) did not affect the specific binding activity of the LH receptor in intact luteal cells indicate that the rapid action of prostaglandins in luteal cells is due to a block of LH-dependent production of cyclic AMP which results in a decrease in progesterone secretion." @default.
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- W2012947562 title "Mechanism of the rapid antigonadotropic action of prostaglandins in cultured luteal cells" @default.
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- W2012947562 doi "https://doi.org/10.1073/pnas.75.3.1344" @default.
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