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Am J Physiol Gastrointest Liver Physiol 262: G840-G846, 1992;
0193-1857/92 $5.00
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AJP - Gastrointestinal and Liver Physiology, Vol 262, Issue 5 840-G846, Copyright © 1992 by American Physiological Society

ARTICLES

Action profiles of nitric oxide, S-nitroso-L-cysteine, SNP, and NANC responses in opossum lower esophageal sphincter

M. A. Knudsen, D. Svane and A. Tottrup
Department of Gynecology and Obstetrics Y, Aarhus Kommunehospital, Denmark.

Circular muscle strips from opossum lower esophageal sphincter were suspended in organ baths for measurement of isometric tension. Nonadrenergic noncholinergic (NANC) inhibitory nerves were stimulated by means of transmural field stimulation. This induced frequency-dependent relaxations of the muscle strips. Methylene blue (3 x 10(-6) M; inhibits guanylate cyclase) and pyrogallol (10(-4) M; generates superoxide anions) had no influence on relaxations, whereas oxyhemoglobin [10(-5) M; binds nitric oxide (NO) and other nitroso compounds extracellularly] inhibited relaxations at all frequencies. NO concentration dependently relaxed the muscle strips. Pyrogallol (10(-4) M) and methylene blue (3 x 10(-6) M) inhibited and oxyhemoglobin (10(-5) M) nearly abolished relaxation induced by NO. S-nitroso-L-cysteine caused concentration-dependent relaxations of the muscle strips, which were inhibited by pyrogallol (10(-4) M), whereas methylene blue (3 x 10(-6) M) augmented the action of S-nitroso-L-cysteine. Methylene blue (3 x 10(-6) M) had no influence on the concentration-dependent relaxations caused by sodium nitroprusside (SNP). Oxyhemoglobin (10(-5) M), and to a lesser extent pyrogallol (10(-4) M), both inhibited the effects of SNP. The action profiles for S-nitroso-L-cysteine, NO, and SNP differed from the action profile for NANC nerve-mediated response. Although pyrogallol inhibited the effects of SNP, the action profile generally resembled the action profile for NANC responses more closely than did the profiles for S-nitroso-L-cysteine or NO. In conclusion, of the nitroso compounds studied, SNP most closely resembled the response to NANC nerve stimulation. Neither NO nor S-nitroso-L-cysteine individually mimicked the NANC response.


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 Am. J. Physiol. Gastrointest. Liver Physiol.Home page
R. K. Goyal and X. D. He
Evidence for NO · redox form of nitric oxide as nitrergic inhibitory neurotransmitter in gut
Am J Physiol Gastrointest Liver Physiol, November 1, 1998; 275(5): G1185 - G1192.
[Abstract] [Full Text] [PDF]


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