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. 1990 Dec;101(4):815–820. doi: 10.1111/j.1476-5381.1990.tb14163.x

Role of nitric oxide in maintaining vascular integrity in endotoxin-induced acute intestinal damage in the rat.

I R Hutcheson 1, B J Whittle 1, N K Boughton-Smith 1
PMCID: PMC1917826  PMID: 2085706

Abstract

1. The role of endogenous nitric oxide (NO) in maintaining intestinal vascular integrity following acute endotoxin (E. coli. lipopolysaccharide) challenge was investigated in the anaesthetized rat by use of NG-monomethyl-L-arginine (L-NMMA), a selective inhibitor of NO synthesis. 2. L-NMMA (10-50 mg kg-1, i.v.) pretreatment enhanced both the macroscopic and histological intestinal damage and the increases in vascular permeability, measured as the leakage of [125I]-labelled human serum albumen, induced after 15 min by endotoxin (50 mg kg-1, i.v.). 3. The effects of L-NMMA (50 mg kg-1, i.v.) were enantiomer specific, as D-NMMA had no effect. Furthermore, these effects were reversed by L-arginine (300 mg kg-1, i.v.), the precursor of NO synthesis but not by D-arginine (300 mg kg-1, i.v.). 4. L-NMMA (10-50 mg kg-1, i.v.) increased mean systemic arterial blood pressure but this does not appear to be the mechanism by which endotoxin-induced intestinal damage was enhanced, since similar systemic pressor responses induced by phenylephrine (10 micrograms kg-1 min-1, i.v.), had no such effect. 5. The results suggest that synthesis of NO from L-arginine has a role in maintaining the microvascular integrity of the intestinal mucosa following acute endotoxin challenge.

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Selected References

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