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首页> 外文期刊>Chemical Senses >Functional Expression of M3, a Muscarinic Acetylcholine Receptor Subtype, in Taste Bud Cells of Mouse Fungiform Papillae
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Functional Expression of M3, a Muscarinic Acetylcholine Receptor Subtype, in Taste Bud Cells of Mouse Fungiform Papillae

机译:M3,毒蕈碱型乙酰胆碱受体亚型,在小鼠真菌状乳头的味蕾细胞中的功能性表达。

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Taste bud cells (TBCs) express various neurotransmitter receptors assumed to facilitate or modify taste information processing within taste buds. We investigated the functional expression of muscarinic acetylcholine receptor (mAChR) subtypes, M1-M5, in mouse fungiform TBCs. ACh applied to the basolateral membrane of TBCs elevates the intracellular Ca~(2+) level in a concentration-dependent manner with the 50% effective concentration (EC_(50)) of 0.6 μM. The Ca~(2+) responses occur in the absence of extracellular Ca~(2+) and are inhibited by atropine, a selective antagonist against mAChRs. The order of 50% inhibitory concentration (IC_(50)) examined with a series of antagonists selective to mAChR subtypes shows the expression of M3 on TBCs. Perforated whole-cell voltage clamp studies show that 1 μM ACh blocks an outwardly rectifying current and that 100 nM atropine reverses the block. Reverse transcriptase-mediated polymerase chain reaction studies suggest the expression of M3 but not the other mAChR subtypes, Immunohistochemical studies show that phospholipase Cβ-immunoreactive TBCs and synaptosome-associated protein of 25 kDa-immunoreactive nerve endings are immunoreactive to a transporter that packs ACh molecules into synaptic vesicles (vesicular acetylcholine transporter). These results show that M3 occurs on a few fungiform TBCs and suggest that a few nerve endings, and probably a few TBCs, release ACh by exocytosis. The role of ACh in taste responses is discussed.
机译:味蕾细胞(TBC)表达各种神经递质受体,这些受体被认为有助于或改变味蕾内的味觉信息处理。我们调查了毒蕈碱型乙酰胆碱受体(mAChR)亚型,M1-M5,在小鼠真菌样TBC中的功能表达。六溴代二苯的基底外侧膜上施加的乙酰胆碱以依赖于浓度的方式升高细胞内Ca〜(2+)水平,有效浓度50%(EC_(50))为0.6μM。 Ca〜(2+)反应在不存在细胞外Ca〜(2+)的情况下发生,并被阿托品(一种针对mAChR的选择性拮抗剂)抑制。用一系列对mAChR亚型具有选择性的拮抗剂检测的50%抑制浓度(IC_(50))的顺序显示了M3在TBC上的表达。穿孔的全细胞电压钳研究表明,1μMACh阻断向外整流电流,而100 nM阿托品逆转该阻断。逆转录酶介导的聚合酶链反应研究表明M3的表达,但不是其他mAChR亚型。免疫组织化学研究显示,磷脂酶Cβ免疫反应性TBC和25 kDa免疫反应性神经末梢的突触体相关蛋白对包装ACh分子的转运蛋白具有免疫反应进入突触小泡(水泡乙酰胆碱转运蛋白)。这些结果表明,M3出现在一些真菌样TBC上,表明一些神经末梢(可能还有几个TBC)通过胞吐作用释放ACh。讨论了乙酰胆碱酯在味觉反应中的作用。

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