PMID: 8583386Sep 1, 1995Paper

The role of nitric oxide and sulphydryls in gastric mucosal protection induced by sodium cromoglycate in rats

The Journal of Pharmacy and Pharmacology
A T Ali


The role of endogenous nitric oxide and sulphydryls in gastric protection afforded by sodium cromoglycate against ethanol-induced gastric lesions was studied in rats. Drugs were administered either intraperitoneally (i.p.) or subcutaneously (s.c.) 30, 45 or 60 min before oral administration of ethanol. Administration of cromoglycate before ethanol dose-dependently inhibited ethanol-induced gastric lesions. Pretreatment with NG-nitro-L-arginine methyl ester (L-NAME), an inhibitor of nitric oxide biosynthesis, dose-dependently aggravated gastric lesions and reduced cromoglycate-induced gastric protection. The attenuating effect of L-NAME on gastric protection elicited by cromoglycate was reversible by pretreatment with L-arginine but not by D-arginine. On the other hand, ethanol-induced gastric lesions were found to be associated with a reduction of nonprotein sulphydryl content of glandular stomachs. Pretreatment with cromoglycate prevented non protein sulphydryl depletion and afforded protection. Pretreatment with N-ethylmaleimide, a sulphydryl blocker, caused dose-dependent enhancement of ethanol-induced gastric lesions and further depletion of non protein-sulphydryl. Treatment with N-ethylmaleimide before cromoglycate reduced...Continue Reading


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