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Am J Physiol Gastrointest Liver Physiol 289: G429-G433, 2005. First published April 28, 2005; doi:10.1152/ajpgi.00502.2004
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MUCOSAL BIOLOGY

Retinoic acid formation from retinol in the human gastric mucosa: role of class IV alcohol dehydrogenase and its relevance to morphological changes

Michinaga Matsumoto, Hirokazu Yokoyama, Hidekazu Suzuki, Haruko Shiraishi-Yokoyama, and Toshifumi Hibi

Department of Internal Medicine, School of Medicine, Keio University, Tokyo, Japan

Submitted 9 November 2004 ; accepted in final form 26 April 2005

Alcohol dehydrogenase (ADH) participates in the formation of retinoic acid from retinol in various organs including the gastric mucosa. However, its clinical significance still remains to be clarified. In this study, we identified the ADH isoforms responsible for the retinoic acid formation among various ADH isoforms and examined associations among the ADH activities, the retinoic acid formation level, and morphological changes in the human gastric mucosa. Human gastric samples were endoscopically obtained from 67 male subjects. Morphological changes were assessed by the Sydney system and activities of class I, III, and IV ADH isoforms were determined in each specimen. In 26 cases, levels of all-trans retinoic acid (ATRA) formation from all-trans retinol were examined. Among activities of the three ADH isoforms, class IV ADH activity was solely associated with the ATRA formation level. This association was found even when subjects' age and Helicobacter pylori infection status were adjusted. As the degrees of inflammation, atrophy, and intestinal metaplasia increased, the class IV ADH activity as well as the potential for the ATRA formation decreased. Class IV ADH is a major enzyme in the retinoic acid supply in the human gastric mucosa, and the reduction of its activity was associated with decreasing retinoic acid supply and progression of inflammation, atrophy, and intestinal metaplasia in the gastric mucosa. In that retinoic acid is a key molecule for maintaining normal morphology, the reduction of class IV ADH activity may be involved in the pathogenesis of these morphological changes in the human gastric mucosa.

{sigma}-alcohol dehydrogenase; vitamin A; atrophy; intestinal metaplasia; Helicobacter pylori


Address for reprint requests and other correspondence: H. Yokoyama, Dept. of Internal Medicine, School of Medicine, Keio Univ., 35 Shinanomachi, Shinjukuku, Tokyo 160-8582, Japan (e-mail; yokoyama{at}sc.itc.keio.ac.jp)






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