Macroscopic jejunal damage and plasma leakage induced within 15 min by E. coli lipopolysaccharide (LPS 50 mg kg-1 i.v.) in the rat was enhanced by the inhibitor of nitric oxide (NO) formation, NG-monomethyl-L-arginine (L-NMMA 50 mg kg-1 i.v.). The nitro-vasodilator, S-nitroso-N-acetyl-penicillamine (SNAP; 10 micrograms kg-1 min-1 i.v.), which generates NO, attenuated both LPS-induced intestinal damage and the enhancement of such damage and plasma leakage produced by L-NMMA. Endogenous NO may thus have a protective role in the intestinal vasculature that can be mimicked by generators of NO.
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