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. 1992 Feb;105(2):315–320. doi: 10.1111/j.1476-5381.1992.tb14252.x

Influence of NG-nitro-L-arginine methyl ester on vagally induced gastric relaxation in the anaesthetized rat.

R A Lefebvre 1, J Hasrat 1, A Gobert 1
PMCID: PMC1908670  PMID: 1559128

Abstract

1. The influence of the nitric oxide (NO) biosynthesis inhibitor NG-nitro-L-arginine methyl ester (L-NAME) on the gastric relaxation induced by peripheral vagal stimulation was investigated in the anaesthetized rat. 2. Peripheral vagal stimulation (10 Hz, 10 V, 1 ms for 20 s) induced a reproducible biphasic response: a short-lasting increase followed by a more pronounced decrease in intragastric pressure. This response also occurred in reserpinized animals (5 mg kg-1, i.p., 24 h before the experiment) while atropine (1 mg kg-1, i.v.) abolished the initial increase in intragastric pressure. 3. L-NAME (1-30 mg kg-1, i.v.) induced an increase in arterial blood pressure. L-NAME (1 mg kg-1, i.v.) had no influence on the vagally induced gastric response while L-NAME (10 and 30 mg kg-1 i.v.) significantly changed it: the initial increase in intragastric pressure was enhanced while the decrease in intragastric pressure was reduced or abolished. NG-nitro-L-arginine (L-NNA, 10 mg kg-1, i.v.) had the same effect. 4. An i.v. infusion of phenylephrine (10 micrograms kg-1 min-1) inducing a pressor response similar to that produced by L-NAME (30 mg kg-1, i.v.) did not influence the vagal gastric response. Infusion of L-arginine (300 mg kg-1 bolus, then 100 mg kg-1 h-1) starting 30 min beforehand, reduced the pressor effect and prevented the influence of L-NAME (10 mg kg-1, i.v.) on the vagal gastric response.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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