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- W635253204 abstract "SummaryThe tachycardic response to 5-HT in the anaesthetized pig was mimicked by the indole derivatives, 5-methoxytryptamine and α-methyl-5-HT, and, to a lesser extent, by the benzamide derivatives (in order of potency) zacopride, renzapride, cisapride, metoclopramide and dazopride; the latter derivatives behaved as partial agonists. ICS 205–930 in high doses (1 and 3 mg/kg), but not other 5-HT receptor antagonists (methiothepin, metergoline, methysergide, mesulergine, ketanserin, cyproheptadine, mianserin, pizotifen, granisetron and MDL 72222) or dopamine antagonists (haloperidol and domperidone), antagonized this response. These results definitely exclude the involvement of 5-HT1-like, 5-HT2, 5-HT3, or dopamine receptors and strongly suggest that the putative 5-HT4 receptor mediates the positive chronotropic action of 5-HT in the anaesthetized pig. This receptor displays a pharmacological profile which indicates similarity with the 5-HT4 receptor present on the neurons of the mouse embryo colliculi and guinea-pig ileum, as well as to that in the human heart. Since the pig heart is devoid of other 5-HT receptors, the heart rate responses to 5-HT in the pig can be utilized as a convenient experimental model for discovering drugs selective at the 5-HT4 receptor. Lastly, the involvement of this novel 5-HT receptor in the above functional responses argues in favour of the extension of the 5-HT receptor classification to include the 5-HT4 receptor." @default.
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- W635253204 date "1991-01-01" @default.
- W635253204 modified "2023-09-26" @default.
- W635253204 title "The 5-HT4 Receptor Mediating Tachycardia in the Pig" @default.
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- W635253204 doi "https://doi.org/10.1007/978-3-0348-7259-1_23" @default.
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