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Specificity of the substituted benzimidazole B 823-08: a prodrug for gastric proton pump inhibition

, : Specificity of the substituted benzimidazole B 823-08: a prodrug for gastric proton pump inhibition. Pharmacology 34(5): 269-278

Substituted benzimidazoles are potent inhibitors of the parietal cell proton pump, the H+/K+-ATPase. One member of this group, the sulfide B 823-08 (2-[(4-methoxy-3-methyl-2-pyridylmethyl)-thio]-5-trifluoromethyl-(1H)- benzimidazole) inhibits gastric acid secretion in various in vivo models, but fails to affect acid secretion in the isolated, lumen perfused mouse stomach. In contrast, the corresponding sulfoxide (B 823-10) is active under both in vivo and in vitro conditions. Since the sulfide is metabolically transformed to sulfoxide in vivo, the sulfide behaves as a prodrug of the sulfoxide. No effects of biological significance are found on organ functions which critically depend on Na+/K+-ATPase activity. This is in line with observations that the sulfoxide needs activation in an acidic environment, which constitutes the basis of its specificity for inhibiting stimulated parietal cells.

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Accession: 041408372

PMID: 2956612

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