Biochemical and pharmacological properties of a new proton pump inhibitor, 2-amino-4,5-dihydropyrido[1,2-a]thiazolo [5,4-g] benzimidazole (YJA20379-5).
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| Abstract |
This study was designed to determine biochemical and pharmacological properties of a newly synthesized benzimidazole derivative, 2-amino-4,5-dihydropyrido [1,2-a] thiazolo [5,4-g] benzimidazole (YJA20379-5) in vitro and in vivo. In the leaky membrane vesicles of pig gastric mucosa, YJA20379-5 inhibited the K(+)-stimulated H+,K(+)-ATPase activity in a concentration- and time-dependent manner, with IC50 values being 43 microM and 31 microM at pH 6.4 and 7.4, respectively. YJA20379-5, given intraduodenally, had a potent inhibitory effect on the gastric acid secretion in pylorus-ligated rats. The ED50 value for acid secretion was 15.4 mg/kg. YJA20379-5, administered orally, also suppressed gastric damages induced by water-immersion stress, indomethacin and ethanol, and duodenal damage induced by mepirizole in rats; the ED50 values were 17.6, 4.7, 3.0 and 18.7 mg/kg, respectively. Furthermore, repeated oral administration of YJA20379-5 accelerated the spontaneous healing of acetic acid-induced gastric ulcers in rats. It is concluded that the antisecretory activity of YJA20379-5 appears to be associated with inhibition of H+,K(+)-ATPase, while its antigastric and antiduodenal lesion activities are primarily related to the antisecretory effect.
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| Authors | S K Sohn, M S Chang, Y K Chung, K B Kim, T W Wook, S G Kim, W S Choi |
| Journal | Archives of pharmacal research (Arch Pharm Res) Vol. 21 Issue 3 Pg. 241-7 (Jun 1998) ISSN: 0253-6269 [Print] Korea (South) |
| PMID | 9875438 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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