Abstract
It is postulated that an enhanced production ofnitric oxide by inflamed intestine plays a role in thepathophysiology of active inflammatory bowel disease. Inthis study, systemic NOx concentrations and colonic nitric oxide synthase activity weredetermined in patients with ulcerative colitis orCrohn's disease. The relationship between these twoparameters and disease activity, as well as differences in nitric oxide synthase activity betweenulcerative colitis and Crohn's disease, were areas ofspecific focus. Patients with active ulcerative colitisand Crohn's disease had significantly elevated plasma NOx concentrations; a positivecorrelation was found between NOx values andinducible nitric oxide synthase activities in the activemucosa of these patients. In active ulcerative colitis,levels of inducible nitric oxide synthase were significantlyelevated in both normal and inflamed mucosa, althoughinducible nitric oxide synthase activity was higher inthe latter. These colonic inducible nitric oxidesynthase activities correlated well with the results ofendoscopic and histologic grading of inflammation. Therewas no increase in constitutive nitric oxide synthaseactivity in patients with active ulcerative colitis. However, constitutive nitric oxidesynthase activity was significantly increased in theinflamed mucosa in patients with Crohn's disease. InCrohn's disease, elevated inducible nitric oxidesynthase activity was found in both normal and inflamedmucosa, with no significant difference between thetissues. Such differences in nitric oxide production inthe colonic mucosa possibly reflect the significant differences in the pathophysiology andcharacteristic clinical features between ulcerativecolitis and Crohn's disease.
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Kimura, H., Miura, S., Shigematsu, T. et al. Increased Nitric Oxide Production and Inducible Nitric Oxide Synthase Activity in Colonic Mucosa of Patients with Active Ulcerative Colitis and Crohn's Disease. Dig Dis Sci 42, 1047–1054 (1997). https://doi.org/10.1023/A:1018849405922
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DOI: https://doi.org/10.1023/A:1018849405922