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- W1987173192 abstract "The effects of the stable endoperoxide analog U46619 (U) on the regulation of prostacyclin (PGI2) formation and cyclic adenosine monophosphate (cAMP) were investigated in cultured bovine aortic endothelial (BAE) cells. Incubation of U (0.3, 3.0 and 30 microM) with BAE cells for 5 min results in a dose-dependent increase in PGI2. Cyclic AMP levels were not changed at 0.3 and 3.0 microM but were stimulated at 30 microM U. When cells were exposed to U for a second and third 5 min period, PGI2 formation at 0.3 and 3.0 microM U remained stimulated while at 30 microM, PGI2 was not increased. Five min incubation of BAE cells with the cyclooxygenase inhibitor indomethacin blocked the stimulation of PGI2 at all concentrations of U and also prevented the increase of cAMP levels at 30 microM. In cells prelabeled with 3H-arachidonate, U stimulated release of labeled products at 0.3 and 3.0 microM but not at 30 microM U. In cells treated with bradykinin in the presence of U, PGI2 production was stimulated at 0.3 and 3.0 microM but not 30 microM U. When cells were exposed to U and stimulated with PGI2 (with and without phosphodiesterase inhibition), U caused significant increases in cAMP. We conclude that incubation of BAE cells with U results in an initial dose-dependent increase in PGI2 formation. Cyclic AMP levels are increased at high concentrations of U. This increase in cAMP is mediated by the initial stimulated PGI2 and results in decreased PGI2 on further exposure to U. Data suggest that U stimulates phospholipase activity and, at high concentrations, inhibits phosphodiesterase." @default.
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- W1987173192 date "1984-07-01" @default.
- W1987173192 modified "2023-09-25" @default.
- W1987173192 title "Effect of the stable endoperoxide analog U-46619 on prostacyclin production and cyclic AMP levels in bovine endothelial cells" @default.
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- W1987173192 doi "https://doi.org/10.1016/0049-3848(84)90213-5" @default.
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