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• W1994764377 abstract "The effects of 4-aminopyridine (4-AP) on the non-adrenergic inhibitory potential (i.p.) in the longitudinal and circular smooth muscle cells of the guinea-pig duodenum were investigated using intracellular microelectrodes. The membrane potential of both smooth muscles was decreased by 4-AP and the amplitude of the evoked i.p.s was increased. In a low-calcium solution (0.25mM), the amplitude of the i.p.s was reduced but the additional application of 4-AP increased the amplitude. In the 4-AP containing low-calcium solution, the i.p. was inhibited by verapamil and EGTA. The inhibitory effect of verapamil on the i.p. evoked in a low-calcium solution was less in the presence of 4-AP than that in its absence. In a high-calcium solution (5mM), the amplitude of the i.p. increased and the additional application of 4-AP enhanced the i.p. further. The amplitude of the i.p. elicited in high-potassium solutions was not changed by 4-AP. The i.p. was not potentiated by 2-aminopyridine or 2, 5-diaminopyridine. Tetraethylammonium ions enhanced the amplitude of the i.p. at low concentration but decreased it in high concentration. In a few longitudinal smooth muscle cells, the evoked excitatory potential (e.p.) was observed. Potentiation of the e.p. by 4-AP was completely blocked by atropine. From the results obtained, it is suggested that the release of the nonadrenergic inhibitory neurotransmitter is increased by 4-AP due to increase calcium influx in the nerve terminals. The release of the cholinergic excitatory neurotransmitter seems to be increased by 4-AP." @default.
• W1994764377 created "2016-06-24" @default.
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• W1994764377 date "1984-01-01" @default.
• W1994764377 modified "2023-09-27" @default.
• W1994764377 title "Effects of 4-aminopyridine on the non-adrenergic inhibitory neurotransmission in the guinea-pig duodenum." @default.
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• W1994764377 doi "https://doi.org/10.2170/jjphysiol.34.893" @default.
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