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- W2015157500 abstract "Acetylcholine (ACh), a major neurotransmitter from the autonomic nervous system, regulates the cholinergic stimulation of insulin secretion, through interactions with muscarinic receptors. The present study has characterised the individual involvement of muscarinic receptor subtypes in ACh-induced insulin secretion, using clonal beta cells and selective muscarinic receptor antagonists. BRIN BD11 cells clearly expressed mRNA encoding m1--m4 whereas m5 was not detected by RT-PCR. Insulin release was measured from BRIN BD11 cells treated with ACh in the presence of muscarinic receptor antagonists at concentrations ranging from 3 nM to 1 microM. 300 nM of muscarinic toxin-3 (M4 antagonist) and 1 microM of methoctramine (M2 antagonist) increased ACh (100 microM) stimulated insulin secretion by 168% and 50% respectively (ANOVA, P<0.05). The antagonists alone had no effect on insulin secretion. In contrast, 300 nM of pirenzepine (M1 antagonist) and 30 nM of hexahydro-sila-difenidol p-fluorohydrochloride (M3 antagonist) inhibited ACh stimulation by 91% and 84% respectively (ANOVA, P<0.01). It is concluded that ACh acts on different receptor subtypes producing both a stimulatory and an inhibitory action on insulin release." @default.
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- W2015157500 date "2002-01-01" @default.
- W2015157500 modified "2023-10-18" @default.
- W2015157500 title "Muscarinic receptor subtypes mediate stimulatory and paradoxical inhibitory effects on an insulin-secreting β cell line" @default.
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- W2015157500 doi "https://doi.org/10.1016/s0304-4165(01)00232-x" @default.
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