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Importance of the L-arginine-nitric oxide pathway in NANC nerve function of the opossum esophageal body.

Authors
  • Knudsen, M A1
  • Svane, D
  • Tøttrup, A
  • 1 Department of Obstetrics and Gynecology Y, Aarhus Kommunehospital, Denmark. , (Denmark)
Type
Published Article
Journal
Digestive diseases (Basel, Switzerland)
Publication Date
Jan 01, 1991
Volume
9
Issue
6
Pages
365–370
Identifiers
PMID: 1725143
Source
Medline
License
Unknown

Abstract

Circular muscle strips from the opossum esophageal body obtained 3-5 cm above the esophagogastric junction were suspended in organ baths for measurement of isometric tension. Stimulation of nonadrenergic, noncholinergic (NANC) inhibitory nerves was performed using transmural field stimulation (TMS). During TMS, no mechanical response was elicited. After cessation of the stimulus a short period, also without mechanical response, intervened, and this period is called latency. The latency was followed by the 'off'-contraction. In control preparations, the latency and the amplitude of the 'off'-contraction were 1.47 +/- 0.17 s, and 3.8 +/- 0.9 mN, respectively. The inhibitor of the L-arginine-nitric oxide (NO) pathway, NG-nitro-L-arginine (L-NNA) concentration-dependently reduced the latency at concentrations greater than 10(-6) M (n = 6-7). At the highest concentration of L-NNA (10(-4) M), 'off' contractions were no longer seen. In 5 out of 7 preparations exposed to L-NNA (10(-4) M), a small contraction was seen during stimulation, and this contraction was abolished by atropine (10(-6) M) in all strips. L-NNA concentration-dependently reduced the amplitude of contractions at concentrations greater than 10(-6) M (n = 6-7). At 10(-4) M, the amplitude was reduced to 3 +/- 2% of that of the initial contraction. Preincubation with L-arginine (10(-5) M) had no influence on the latency. The effects of L-NNA on both latency and the amplitude of contraction were antagonized by preincubation with L-arginine (10(-5) M). Atropine (10(-6) M had no effect on the amplitude of the 'off'-contraction in control preparations.(ABSTRACT TRUNCATED AT 250 WORDS)

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