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. 1994 May;112(1):161–168. doi: 10.1111/j.1476-5381.1994.tb13046.x

Tachykinin NK1 and NK2 receptor antagonists and atropine-resistant ascending excitatory reflex to the circular muscle of the guinea-pig ileum.

C A Maggi 1, R Patacchini 1, L Bartho 1, P Holzer 1, P Santicioli 1
PMCID: PMC1910303  PMID: 8032637

Abstract

1. The aim of this study was to investigate the effect of various antagonists, selective for the tachykinin NK1 or NK2 receptor, on the atropine-resistant ascending excitatory reflex (AER) to the circular muscle of the guinea-pig ileum elicited by radial stretch (balloon distension) or electrical field stimulation. 2. Submaximal and maximal atropine- (1 microM) resistant AER elicited by balloon distension averaged about 40-50% and 70-90% of maximal circular spasm to 80 mM KCl, respectively. The NK1 receptor antagonist, (+/)-CP 96,345 (1 microM) inhibited both maximal and submaximal AER. FK 888 (1-3 microM) inhibited submaximal AER only. RP 67,580 (1 microM) was ineffective. The NK2 receptor antagonist, GR 94,800, inhibited both maximal and submaximal AER at all concentrations tested (0.1-3.0 microM), while SR 48,968 was effective only at 1.0 microM. The NK2 receptor antagonists, MEN 10,376 and MEN 10,573 inhibited both submaximal and maximal AER at 10 and 1.0 microM, respectively. 3. In other experiments, an NK1 receptor antagonist, (+/-)-CP 96,345 or FK 888 (1.0 microM in each case) was administered first and the effect of GR 94,800 (1.0 microM) on the residual AER response was determined; or GR 94,800 was administered first and the effect of (+/-)-CP 96,345 or FK 888 was determined. The results of these experiments indicated an additive effect produced by the combined treatment with NK1 and NK2 receptor antagonists.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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