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Vol. 296, Issue 1, 48-56, January 2001

FR167653, a p38 Mitogen-Activated Protein Kinase Inhibitor, Prevents Helicobacter pylori-Induced Gastritis in Mongolian Gerbils

Satoru Takahashi , Yoshihiro Keto, Takuya Fujita, Tomomi Uchiyama and Akira Yamamoto

Departments of Applied Pharmacology (S.T., Y.K.) and Biopharmaceutics (S.T., T.F., T.U., A.Y.), Kyoto Pharmaceutical University, Misasagi, Yamashina, Kyoto, Japan

FR167653 was discovered as a cytokine production inhibitor, but its target molecule has remained unclear. We examined the effect of FR167653 on activities of purified protein kinases. FR167653 dose dependently inhibited p38alpha mitogen-activated protein kinase activity without affecting the activities of other kinases. FR167653 had no effect on cyclooxygenase (COX)-1 or COX-2 activities, whereas SB203580 inhibited them. FR167653 suppressed endogenous p38 kinase activity in interleukin-1-stimulated NRK-F cells. These results indicate that FR167653 is a p38 kinase-selective inhibitor without affecting COX activity. To evaluate the role of p38 kinase in Helicobacter pylori gastritis, we therefore examined the effect of FR167653 on H. pylori-induced gastritis in Mongolian gerbils. H. pylori infection activated p38 kinase in the gastric mucosa and caused neutrophil infiltration from 2 and 3 weeks of infection, respectively. At 4 weeks, severe mucosal inflammation with erosive injury was observed. When FR167653 was administered to H. pylori-infected gerbils from 2 weeks, both neutrophil infiltration and mucosal injury at 4 weeks were significantly prevented. FR167653 markedly reduced the H. pylori-induced increase in endogenous p38 kinase activity in the gastric mucosa, and also significantly inhibited neutrophil chemokine production. In contrast, the drug did not affect H. pylori colonization or acid secretion. FR167653 did not cause any pathological change in the gastric mucosa of normal animals. These results indicate that p38 kinase plays a crucial role in H. pylori-induced gastritis in Mongolian gerbils.


0022-3565/01/2961-0048$03.00/0
THE JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS
Copyright © 2001 by The American Society for Pharmacology and Experimental Therapeutics



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