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. 1996 Jul;118(5):1253–1261. doi: 10.1111/j.1476-5381.1996.tb15531.x

Functional evidence for NO-synthase activation by substance P through a mechanism not involving classical tachykinin receptors in guinea-pig ileum in vitro.

R Garcia-Villar 1, C Dupuis 1, J P Martinolle 1, J Fioramonti 1, L Buéno 1
PMCID: PMC1909580  PMID: 8818351

Abstract

1. This study tested the hypothesis that a nitric oxide synthase (NOS) was activated in guinea-pig ileum in vitro in response to substance P (SP), and attempted to characterize the tachykinin receptor involved in this activation by the use of selective receptor agonists and antagonists. 2. Strips of guinea-pig ileum (8 x 2 mm) were superfused (Krebs, 37 degrees C, 2 ml min-1) with: (i) tachykinin receptor agonists: SP, GR 73,632 (NK1), GR 64,349 (NK2), senktide (NK3), and neuropeptide (NP) gamma; (ii) tachykinin receptor antagonists: CP 99,994 (NK1), SR 48,968 (NK2), SR 142,801 (NK3); (iii) nerve-related agents: carbachol (CCh), atropine, tetrodotoxin (TTX), hexamethonium; (iv) NOS inhibitors: N omega-nitro-L-arginine-methyl-ester (L-NAME), N omega-monomethyl-L-arginine (L-NMMA) and aminoguanidine (AG); (v) NO-related agents, L-arginine (L-Arg), D-arginine (D-Arg), sodium nitroprusside (NaNP) and methaemoglobin. Muscle contractility was recorded isometrically and quantified as integrated area of activity. 3. SP, tachykinin receptor agonists and NP gamma (10 pM to 10 microM), produced concentration-dependent contractions of ileal strips, with EC50s in the nanomolar range, and maximal responses (Emax) attained at 0.1 microM for SP and 1 microM for the other agonists. The Emax response to SP equalled that to KCl (60 mM) taken as a 100% control (99.3% [93.0-105.7]; mean and 95% CI; n = 12); a comparable Emax contraction was obtained with the other tachykinin receptor agonists (1 microM) as well as with CCh (1 microM). 4. Under baseline conditions, L-NAME (1 microM), L-NMMA (1 microM) and AG (1 microM), failed to contract the muscle strip. In contrast, when superfused for 3 min, 10 min after SP (0.1 microM), they induced a transient contraction of the strip (e.g. for 1 microM L-NAME: 50 to 70 s duration; amplitude 73 +/- 12%, n = 24). 5. The NOS inhibitor-induced contractile response was not obtained after KCl (60 mM), GR 73,632, GR 64,349, senktide or CCh (all up to 1 microM). In contrast, this contractile response was obtained after NP gamma (1 microM). 6. Blockade of tachykinin NK1, NK2 and NK3 receptors by continuous superfusion of CP 99,994, SR 48,968 and SR 142,801 (1 microM) respectively, starting 5 min before SP, did not modify the response to L-NAME, superfused 10 min after SP (0.1 microM). The contractile response to L-NAME (1 microM) was blocked by atropine (1 microM), superfused either before or after SP. In contrast, it persisted after TTX or hexamethonium (1 microM) superfused in the same conditions. 7. The amplitude of NOS inhibitor-induced contraction (1 microM) was dependent on the concentration of priming SP (1 pM to 1 microM). In contrast, the contractile response to NOS inhibitors (1 nM to 10 microM) of the ileum strip primed with SP (0.1 microM) was not concentration-related. 8. L-NAME-induced contraction was prevented by continuous superfusion of L-Arg (1 microM), but not D-Arg (1 microM). In addition, the NO donor, sodium nitroprusside (1 microM) and the NO scavenger, methaemoglobin (10 micrograms ml-1), both prevented the contractile response to L-NAME. 9. In summary, SP and to a lesser extent NP gamma, exert a permissive action allowing contractile stimulating effects of L-NAME, L-NMMA and AG, in guinea-pig ileum in vitro, by a mechanism which apparently does not involve tachykinin NK1, NK2 and NK3 receptors. This action is likely to result from the activation of a NO-synthase by SP in the vicinity of intestinal myocytes. Thus, L-NAME, L-NMMA or AG, by blocking this SP-induced NO production, unveiled a smooth muscle contraction which involves a cholinoceptor (atropine-sensitive) mechanism.

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Selected References

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