Effects of nitric oxide synthase inhibition on the pathophysiology observed in a model of chronic granulomatous colitis.

The objective of this study was to assess the role that nitric oxide (NO) may play in mediating the colonic inflammation observed in a model of chronic granulomatous colitis using two pharmacologically different inhibitors of nitric oxide synthase (NOS). The NOS inhibitors NG-nitro-L-arginine methyl ester (L-NAME; 15 mumol/kg/day) and aminoguanidine (AG; 15 mumol/kg/day) were administered to rats in their drinking water, beginning 3 days before the induction of colitis and continuing for the entire 3-week period. We found that chronic NOS inhibition by L-NAME or AG significantly attenuated the peptidoglycan/polysacchride (PG/PS)-induced increases in macroscopic colonic inflammation scores and colonic MPO activity. Only AG, and not L-NAME, attenuated the PG/PS-induced increases in colon dry weight. Both L-NAME and AG significantly attenuated the PG/PS-induced increases in spleen inflammation, whereas neither drug significantly attenuated the PG/PS-induced liver inflammation. Although both L-NAME and AG inhibited NO production in vivo, as measured by decreases in plasma nitrite and nitrate levels, only AG was found to attenuate these values significantly (38 +/- 3 vs. 83 +/- 8 microM, respectively; P < .05). Finally, administration of L-NAME, but not of AG, significantly increased mean arterial pressure from 83 mm Hg in colitic animals to 105 mm Hg in the PG/PS+L-NAME-treated animals (P < .05). We conclude that NO may play an important role in mediating some of the pathophysiology associated with this model of chronic granulomatous colitis.

• Publication year

  1994

• Venue

  Journal of Pharmacology and Experimental Therapeutics

• Publication date

  1994-11-01

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/s0022-3565(25)23789-2PMID 7525937
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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