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- W285405366 abstract "Isolated guinea pig chromaffin cells possess both nicotinic (nAChR) and muscarinic (mAChR) cholinergic receptors that are positively coupled to catecholamine (CA) release. Sixty to 70% of CA release is mediated by nAChRs and 30-40% by mAChRs. In the absence of added calcium, nAChR mediated CA release was reduced by 65% whereas the muscarinic response was unaffected. The addition of 100nM 12-0-tetradecanoylphorbol-13-acetate (TPA), an activator of protein kinase C (PKC), also resulted in an increased CA release. Temporally and quantitatively, this response resembled that of mAChR activation. Addition of optimal concentrations of nicotine (50..mu..M) and TPA (100nM) induced a synergistic increase in CA release. Addition of muscarine (1mM) and TPA resulted in an additive response despite a 40-60% inhibition of mAChR mediated inositol phosphate release by TPA. Thus, in guinea pig chromaffin cells, it appears that PKC activation alone is a sufficient stimulus for CA release and that activation of both nicotinic and muscarinic receptors may further increase this enzyme's activity." @default.
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- W285405366 date "1986-05-01" @default.
- W285405366 modified "2023-09-24" @default.
- W285405366 title "Modulation of muscarinic and micotinic cholinergic receptor mediated catecholamine secretion in guinea pig chromaffin cells by phorbol esters" @default.
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