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. 1991 Feb;102(2):434–438. doi: 10.1111/j.1476-5381.1991.tb12191.x

Evidence for nitric oxide as mediator of non-adrenergic non-cholinergic relaxations induced by ATP and GABA in the canine gut.

G E Boeckxstaens 1, P A Pelckmans 1, H Bult 1, J G De Man 1, A G Herman 1, Y M van Maercke 1
PMCID: PMC1918030  PMID: 1673072

Abstract

1 The effects of haemoglobin, and the nitric oxide (NO) biosynthesis-inhibitors NG-monomethyl-L-arginine (L-NMMA), its enantiomer D-NMMA, and NG-nitro-L-arginine (L-NNA) were investigated on nonadrenergic non-cholinergic (NANC)-mediated relaxation of circular muscle strips of the canine terminal ileum and ileocolonic junction induced by electrical stimulation, adenosine 5'-triphosphate (ATP), gamma-aminobutyric acid (GABA) and NO. 2 Tetrodotoxin, L-NMMA and L-NNA, but not D-NMMA, inhibited the relaxations induced by electrical stimulation, ATP and GABA, but not those in response to NO. 3 The inhibitory effect of L-NMMA and L-NNA was prevented by L-arginine, but not by D-arginine. L-Arginine did not potentiate any of the NANC relaxations. 4 Haemoglobin reduced the relaxation induced by electrical stimulation, ATP and GABA, and abolished those in response to NO. 5 Our results demonstrate that the ATP- and GABA-induced relaxations resulting from stimulation of intramural NANC neurones, in addition to those induced by electrical impulses, are mediated by NO or a NO releasing substance and thus provide further evidence in support of the proposal that NO is the final inhibitory NANC neurotransmitter in the canine terminal ileum and ileocolonic junction.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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