Abstract:
:Possible mediators of descending inhibition in the rat proximal colon were studied. Localized distension with a small balloon caused relaxation of the circular muscle on the anal side of the distended region. This relaxation was still observed after the colonic segment had been desensitized to ATP, neurotensin and vasoactive intestinal peptide, so these compounds seem unlikely to mediate descending inhibition. Nitro-arginine inhibited the relaxation induced by the distension, and L-arginine counteracted the effect of nitro-arginine. Nitric oxide, isoamylnitrate and sodium nitroprusside caused relaxation. These results strongly suggest an essential role of nitric oxide in descending relaxation in the rat proximal colon.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Hata F,Ishii T,Kanada A,Yamano N,Kataoka T,Takeuchi T,Yagasaki Odoi
10.1016/0006-291x(90)91605-rsubject
Has Abstractpub_date
1990-11-15 00:00:00pages
1400-6issue
3eissn
0006-291Xissn
1090-2104pii
0006-291X(90)91605-Rjournal_volume
172pub_type
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