Antisecretory Effect of Hydrogen Sulfide on Gastric Acid Secretion and the Involvement of Nitric Oxide

الملخص EN

The present study was designed to investigate the effect of H2S on distention-induced gastric acid secretion.

Fifty-two rats were randomly assigned to seven experimental groups.

The gastric acid secretion was stimulated by gastric distention.

Two groups of rats received L-cysteine or saline for 5 days before stimulation of the gastric acid secretion.

Two groups of animals also received NaHS or saline just prior to stimulation of the gastric acid secretion.

The effect of L-NAME and propargylglycine was also investigated.

The mucosal levels of the gene expression of cyclooxygenase-2 (COX-2), endothelial nitric oxide synthase (eNOS), and H+/K+-ATPase α-subunit were quantified by qPCR and luminal concentrations of NO were determined.

NaHS and L-cysteine decreased the gastric acid output in response to distention.

The mRNA expression of H+/K+-ATPase α-subunit decreased by NaHS and L-cysteine as compared with the control group while gene expression of eNOS and COX-2 was upregulated.

The inhibitory effect of NaHS on distention-induced gastric acid secretion was mitigated by pretreatment of L-NAME.

These findings suggest the involvement of NO in mediating the antisecretory effect of H2S.