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首页> 外文期刊>European Journal of Pharmacology: An International Journal >Histamine H(3) receptor-mediated inhibition of endogenous acetylcholine release from the isolated, vascularly perfused rat stomach.
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Histamine H(3) receptor-mediated inhibition of endogenous acetylcholine release from the isolated, vascularly perfused rat stomach.

机译:组胺H(3)受体介导的内源性乙酰胆碱从孤立的血管灌注大鼠胃中释放的抑制作用。

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摘要

We studied the effects of histamine H(3) receptor ligands on the release of endogenous acetylcholine from the isolated, vascularly perfused rat stomach. The stomach was perfused via the celiac artery with modified Krebs-Ringer solution containing physostigmine. Released acetylcholine from the portal vein was electrochemically measured using high-performance liquid chromatography and an enzyme system. Vagus nerves were electrically stimulated twice for 2 min (0.5 or 2.5 Hz). Acetylcholine release evoked at 2.5 Hz was slightly inhibited by histamine and effectively potentiated by thioperamide, a histamine H(3) receptor antagonist. Acetylcholine release evoked at 0.5 Hz in the presence of atropine was not influenced by thioperamide, but effectively inhibited by histamine, R-alpha-methylhistamine or imetit, histamine H(3) receptor agonists. These inhibitory effects were abolished by thioperamide or pertussis toxin. These results suggest that histamine attenuates acetylcholine release from vagus nerves through histamine H(3) receptor-mediated and pertussis toxin-sensitive mechanisms in the rat stomach.
机译:我们研究了组胺H(3)受体配体对从孤立的血管灌注大鼠胃中释放内源性乙酰胆碱的影响。经由腹腔动脉用含有毒扁豆碱的改良的Krebs-Ringer溶液灌注胃。使用高效液相色谱和酶系统电化学测量从门静脉释放的乙酰胆碱。对迷走神经进行两次电刺激,持续2分钟(0.5或2.5 Hz)。在2.5 Hz诱发的乙酰胆碱释放被组胺轻微抑制,并被组胺H(3)受体拮抗剂thioperamide有效增强。在存在阿托品的情况下,在0.5 Hz诱发的乙酰胆碱释放不受硫代过酰胺的影响,但被组胺,R-α-甲基组胺或类似的组胺H(3)受体激动剂有效抑制。硫代过酰胺或百日咳毒素消除了这些抑制作用。这些结果表明组胺通过大鼠胃中的组胺H(3)受体介导的和百日咳毒素敏感的机制减弱迷走神经从乙酰胆碱释放。

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