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- W2021018995 abstract "We previously reported that prostaglandin D2 (PGD2) specifically elevates intracellular cyclic AMP in nonchromaffin cells isolated from bovine adrenal medulla (Biochim. Biophys. Acta (1989) 1011, 75-80). Here we again found that PGD2 increased intracellular Ca2+ concentration ([Ca2+]i) in freshly isolated nonchromaffin cells and investigated the cellular mechanisms of PGD2-induced [Ca2+]i increase using the Ca2+ indicator fura-2 and a fluorescence microscopic imaging system. Treatment of the cells with PGD2 receptor agonists BW245C and ZK110841 resulted in both marked stimulation of cyclic AMP formation and an increase in [Ca2+]i. The [Ca2+]i response was also induced by bypassing of the receptor with forskolin, a direct activator of adenylate cyclase, but not by PGE2 or PGF2 alpha both of which are devoid of the ability to generate cyclic AMP in the cells. These cyclic AMP and [Ca2+]i responses induced by PGD2 were completely blocked by the PGD2 receptor antagonist BWA868C. The time-course of cyclic AMP production stimulated by PGD2 coincided with that of the [Ca2+]i increase. While the Ca(2+)-mobilizing hormone bradykinin stimulated a rapid inositol phosphate accumulation in nonchromaffin cells, PGD2 did not stimulate it significantly. Removal of extracellular Ca2+ markedly reduced the Ca2+ response to PGD2 in magnitude and duration, but did not alter the peak [Ca2+]i response to bradykinin. These results demonstrate that PGD2 receptor activation induces the increase in [Ca2+]i via cyclic AMP mainly by increasing the Ca2+ influx from the outside, unlike inositol trisphosphate which causes release of Ca2+ from internal stores." @default.
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- W2021018995 date "1993-03-01" @default.
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- W2021018995 title "Cyclic-AMP-dependent Ca2+ influx elicited by prostaglandin D2 in freshly isolated nonchromaffin cells from bovine adrenal medulla" @default.
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- W2021018995 doi "https://doi.org/10.1016/0167-4889(93)90190-z" @default.
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