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- W2013114319 abstract "The inhibitory effects of adenosine, ATP, 5'-adenylyl methylene diphosphonate (beta, gamma-meATP) and adenosine 5'-alpha, beta-methylene triphosphonate (alpha, beta-meATP) were compared on the cholinergic twitch responses to transmural stimulation of the guinea-pig ileum. Adenosine, ATP and beta, gamma-meATP reduced the twitch responses in a concentration dependent manner. Theophylline antagonized and dipyridamole potentiated the inhibitory responses to adenosine, ATP and beta, gamma-meATP. Inhibitory responses to alpha, beta-meATP were usually preceded by an enhancement in twitch height. Contractions of the unstimulated ileum to alpha, beta-meATP were blocked by atropine and tetrodotoxin while those elicited by ATP were unaffected, which suggests that the initial excitatory effects of alpha, beta-meATP may be due to its ability to release ACh from cholinergic nerve terminals. Use of high pressure liquid chromatography and bioluminescence assay techniques demonstrated the ability of the tissue to degrade ATP and beta, gamma-meATP and, at a much slower rate, alpha, beta-meATP. Inhibitory responses to ATP, AMP and beta, gamma-meATP were reduced by adenosine deaminase, which also abolished responses to adenosine. 5'-AMP deaminase abolished responses to AMP and adenosine, and reduced those to ATP and beta, gamma-meATP. The results suggest that the inhibitory effect of ATP on cholinergic neurotransmission is due to its rapid breakdown to AMP or adenosine, which act on prejunctional P1-purinoceptors." @default.
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- W2013114319 date "1982-01-01" @default.
- W2013114319 modified "2023-10-18" @default.
- W2013114319 title "Evidence for the presence of P1-purinoceptors on cholinergic nerve terminals in the guinea-pig ileum" @default.
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- W2013114319 doi "https://doi.org/10.1016/0014-2999(82)90527-1" @default.
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