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. 1993 Oct;110(2):795–803. doi: 10.1111/j.1476-5381.1993.tb13882.x

Tachykinin NK1 but not NK2 receptors mediate non-cholinergic excitatory junction potentials in the circular muscle of guinea-pig colon.

V Zagorodnyuk 1, P Santicioli 1, C A Maggi 1
PMCID: PMC2175963  PMID: 8242253

Abstract

1. The effect of tachykinin NK1 and NK2 receptor antagonists on noncholinergic excitatory junction potentials (e.j.ps) evoked by electric field stimulation (EFS) in the circular muscle of the guinea-pig proximal colon was investigated by means of a sucrose-gap technique. 2. In the presence of 1 microM atropine, submaximal EFS (10 Hz, 20-30 V, 0.5 ms pulse width, 1 s train duration) evoked an inhibitory junction potential (i.j.p.) followed by e.j.p. with superimposed action potentials (APs) and contraction. Addition of either NG-nitro-L-arginine (L-NOARG, 0.1 mM) or apamin (0.1 microM) inhibited the evoked i.j.p. and the combined administration of the two agents almost abolished it. In the presence of both L-NOARG and apamin, an atropine-resistant e.j.p. was the only electrical response evoked by EFS in 50% of cases and a small i.j.p. (10% of original amplitude) followed by e.j.p. was evident in the remainder. 3. In the presence of L-NOARG and apamin, the tachykinin NK1 receptor antagonists, (+/-)-CP 96,345 and GR 82,334 (10 nM-3 microM) concentration-dependently inhibited the atropine-resistant e.j.p. and accompanying contraction evoked by EFS. EC50 values were: 0.77 microM (e.j.p. inhibition) and 0.22 microM (inhibition of contraction) for (+/-)-CP 96,345; 0.61 microM (e.j.p. inhibition) and 0.20 microM (inhibition of contraction) for GR 82,334. The tachykinin NK2 receptor antagonists, MEN 10,376 (up to 3 microM) and SR 48,968 (up to 1 microM) had no effect on the atropine-resistant e.j.p. MEN 10,376 (3 microM) but not SR 48,968 produced a slight inhibition of the evoked contraction.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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