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- W1569602839 abstract "In cultured human 1321N1 astrocytoma cells, muscarinic receptor stimulation leads to phosphoinositide hydrolysis, formation of inositol phosphates, and mobilization of intracellular Ca2+. Treatment of these cells with 1 microM 4 beta-phorbol 12 beta-myristate 13 alpha-acetate (PMA) completely blocks the carbachol-stimulated formation of [3H]inositol mono-, bis-, and trisphosphate ( [3H]InsP, [3H]InsP2, and [3H]InsP3). The concentrations of PMA that give half-maximal and 100% inhibition of carbachol-induced [3H]InsP formation are 3 nM and 0.5 microM, respectively. Inactive phorbol esters (4 alpha-phorbol 12,13-didecanoate and 4 beta-phorbol), at 1 microM, do not inhibit carbachol-stimulated [3H]InsP formation. The KD of the muscarinic receptor for [3H]N-methyl scopolamine is unchanged by PMA treatment, while the IC50 for carbachol is modestly increased. PMA treatment also abolishes carbachol-induced 45Ca2+ efflux from 1321N1 cells. The concomitant loss of InsP3 formation and Ca2+ mobilization is strong evidence in support of a causal relationship between these two responses. In addition, our finding that PMA blocks hormone-stimulated phosphoinositide turnover suggests that there may be feedback regulation of phosphoinositide metabolism through the Ca2+- and phospholipid-dependent protein kinase." @default.
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- W1569602839 date "1985-05-01" @default.
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- W1569602839 title "Phorbol ester inhibits phosphoinositide hydrolysis and calcium mobilization in cultured astrocytoma cells." @default.
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- W1569602839 doi "https://doi.org/10.1016/s0021-9258(18)89010-x" @default.
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