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AJP - Gastrointestinal and Liver Physiology, Vol 264, Issue 2 334-G340, Copyright © 1993 by American Physiological Society
ARTICLES |
J. R. Grider
Department of Physiology, Medical College of Virginia, Richmond 23298-0711.
Involvement of vasoactive intestinal peptide (VIP) and nitric oxide (NO) in neurally induced relaxation was examined in smooth muscle from rat colon. Relaxation induced by field stimulation or radial stretch (i.e., descending relaxation phase of the peristaltic reflex) was accompanied by VIP release and NO production. NG-nitro-L-arginine (L-NNA) abolished NO production in both preparations but only partly inhibited VIP release (45 +/- 8% at 8 Hz and 59 +/- 10% at 10 g stretch) and relaxation (62 +/- 5% and 35 +/- 6%); the effect of L-NNA was reversed by L-arginine but not D-arginine. The pattern implied that NO production normally acts to enhance VIP release. In addition, VIP induced relaxation and stimulated NO production in muscle strips and isolated colonic muscle cells: L-NNA abolished NO production but only partly inhibited relaxation (58 +/- 6%); oxyhemoglobin had no effect. The effect of L-NNA on relaxation was reversed by L-arginine but not by D-arginine. The protein kinase A inhibitor (R)-p-adenosine 3',5'-cyclic phosphorothioate [(R)-p-cAMPS] and the protein kinase G inhibitor KT5823 inhibited VIP-induced relaxation by 76 +/- 5 and 35 +/- 4%, respectively; a combination of the two inhibitors abolished relaxation. (R)-p-cAMPS blocked the direct relaxant effect of VIP, whereas KT5823 blocked the indirect effect of VIP mediated by NO.(ABSTRACT TRUNCATED AT 250 WORDS)
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