Pharmacological differentiation of presynaptic M1 muscarinic receptors modulating acetylcholine release from postsynaptic muscarinic receptors in guinea-pig ileum

Koichiro Kawashima, Kazuko Fujimoto, Takeshi Suzuki, Hisayo Oohata

研究成果: Article査読

17 被引用数 (Scopus)

抄録

1. 1. Effects of three muscarinic antagonists on electrically evoked ACh release and contractile response were investigated in longitudinal muscle strips of guinea-pig ileum suspended in an organ-bath and superfused with Krebs solution. ACh release was determined by a specific radioimmunoassay. 2. 2. Telenzepine, a selective M1 muscarinic antagonist, increased the ACh release at a concentration of 100-fold less than that inhibiting the contractile response (10 vs 1000 nM). 3. 3. AF-DX 116, a cardioselective M2 muscarinic antagonist, inhibited the contractile response at 10 μM, but did not affect the ACh release at this concentration. 4. 4. (-)N-Methylscopolamine (NMS) did not affect the ACh release, but inhibited the contractile response at all concentrations tested (1-1000 nM), indicating (-)NMS can be used as an ileal specific postsynaptic muscarinic antagonist. 5. 5. These data demonstrate that presynaptic muscarinic receptors modulating ACh release are distinct from postsynaptic ones involved in the contractile response and can be classified as M1 subtype.

本文言語English
ページ(範囲)17-21
ページ数5
ジャーナルGeneral Pharmacology
21
1
DOI
出版ステータスPublished - 1990

ASJC Scopus subject areas

  • Pharmacology

フィンガープリント 「Pharmacological differentiation of presynaptic M<sub>1</sub> muscarinic receptors modulating acetylcholine release from postsynaptic muscarinic receptors in guinea-pig ileum」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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