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- W2017694567 abstract "Primary cultures of rat cerebellar granule cells are shown to possess a high density (283 +/- 48 fmol/mg of protein) of muscarinic receptor sites, defined using N-[3H]methylscopolamine [( 3H]NMS), with a KD of 0.18 +/- 0.01 nM measured after culture in vitro for 7 days. Displacement of specific [3H]NMS binding demonstrated a muscarinic receptor with low affinity for pirenzepine (Ki: 240 nM); further investigation using antagonists, AF-DX 116 and 4-DAMP to discriminate between M2 and M3 receptors respectively, revealed low M2 affinity (Ki: 600 nM) and high M3 affinity (Ki: 2.4 nM), indicative of the M3 receptor subtype. The robust muscarinic receptor stimulation of [3H]inositol phosphate formation, previously observed in these cells, was confirmed. Inhibition of this response followed a similar profile to the binding data, exhibiting weak inhibitory effects for pirenzepine (Ki: 710 nM) and AF-DX 116 (Ki: 5000 nM), but a potent action for 4-DAMP (Ki: 2.4 nM). The opposite profile seen for AF-DX 116 and 4-DAMP is indicative of a M3 receptor subtype expressed on these cells and linked to phosphoinositide hydrolysis. Further studies demonstrated that M3 receptor stimulation caused a rapid, transient increase in the second messenger inositol 1,4,5-trisphosphate, suggesting that potential Ca(2+)-homeostatic and neuromodulatory effects may be mediated by this response." @default.
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- W2017694567 date "1991-03-01" @default.
- W2017694567 modified "2023-09-27" @default.
- W2017694567 title "M3 muscarinic cholinoceptors are linked to phosphoinositide metabolism in rat cerebellar granule cells" @default.
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- W2017694567 doi "https://doi.org/10.1016/s0922-4106(05)80017-3" @default.
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