Teprenone, but not H2‐Receptor Blocker or Sucralfate, Suppresses Corpus Helicobacter pylori Colonization and Gastritis in Humans: Teprenone Inhibition of H. pylori‐Induced Interleukin‐8 in MKN28 Gastric Epithelial Cell Lines

ABSTRACT Background. The role of teprenone in Helicobacter pylori ‐associated gastritis has yet to be determined. To investigate the effect of teprenone on inflammatory cell infiltration, and on H. pylori colonization of the gastric mucosa in H. pylori ‐infected patients, we first compared the effect of teprenone with that of both histamine H2 receptor antagonists (H2‐RA) and sucralfate on the histological scores of H. pylori gastritis. We then examined its in vitro effect on H. pylori ‐induced interleukin (IL)‐8 production in MKN28 gastric epithelial cells. Materials and Methods. A total of 68 patients were divided into three groups, each group undergoing a 3‐month treatment with either teprenone (150 mg/day), H2‐RA (nizatidine, 300 mg/day), or sucralfate (3 g/day). All subjects underwent endoscopic examination of the stomach before and after treatment. IL‐8 production in MKN28 gastric epithelial cells was measured by enzyme‐linked immunosorbent assay (ELISA). Results. Following treatment, the teprenone group showed a significant decrease in both neutrophil infiltration and H. pylori density of the corpus (before vs. after: 2.49 ± 0.22 vs. 2.15 ± 0.23, p = .009; 2.36 ± 0.25 vs. 2.00 ± 0.24, p = .035, respectively), with no significant differences seen in either the sucralfate or H2‐RA groups. Teprenone inhibited H. pylori ‐enhanced IL‐8 production in MKN28 gastric epithelial cells in vitro, in a dose‐dependent manner. Conclusions. Teprenone may modify corpus H. pylori ‐associated gastritis through its effect on neutrophil infiltration and H. pylori density, in part by its inhibition of IL‐8 production in the gastric mucosa.