title: Antibacterial activity of hydrolyzable tannins derived from medicinal plants against Helicobacter pylori.
abstract: Helicobacter pylori is a major etiological agent in gastroduodenal disorders. In this study, we isolated 36 polyphenols and 4 terpenoids from medicinal plants, and investigated their antibacterial activity against H. pylori in vitro. All hydrolyzable tannins tested demonstrated promising antibacterial activity against H. pylori. Monomeric hydrolyzable tannins revealed especially strong activity. Other compounds demonstrated minimal antibacterial activity with a few exceptions. A monomeric hydrolyzable tannin, Tellimagrandin I demonstrated time- and dose-dependent bactericidal activity against H. pylori in vitro. On the other hand, hydrolyzable tannins did not affect the viability of MKN-28 cells derived from human gastric epithelium. Hydrolyzable tannins, therefore, have potential as new and safe therapeutic regimens against H. pylori infection. Furthermore, we investigated effects of hydrolyzable tannins on lipid bilayer membranes. All the hydrolyzable tannins tested demonstrated dose-dependent membrane-damaging activity. However, it remains to be elucidated whether their membrane-damaging activity directly contributes to their antibacterial action.
authors.affiliation: Division of Bacteriology, Department of Infection and Immunity, Jichi Medical School.
authors.forename: Keiji
authors.initials: K
authors.lastname: Funatogawa
authors.forename: Shunji
authors.initials: S
authors.lastname: Hayashi
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Shimomura
authors.forename: Takashi
authors.initials: T
authors.lastname: Yoshida
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Hatano
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Ito
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Hirai
mesh_terms: D000143:Acids / Q000737:chemistry; D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002462:Cell Membrane / Q000187:drug effects; D005419:Flavonoids / Q000494:pharmacology; D005707:Gallic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology; D005960:Glucosides / Q000494:pharmacology; D016480:Helicobacter pylori / Q000187:drug effects*; D006801:Humans; D006868:Hydrolysis; D047348:Hydrolyzable Tannins; D008826:Microbial Sensitivity Tests; D010636:Phenols / Q000494:pharmacology; D010946:Plants, Medicinal / Q000737:chemistry*; D059808:Polyphenols; D013634:Tannins / Q000737:chemistry / Q000494:pharmacology* / Q000633:toxicity; D013729:Terpenes / Q000494:pharmacology; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000143:Acids; D000900:Anti-Bacterial Agents; D005419:Flavonoids; D005960:Glucosides; D047348:Hydrolyzable Tannins; D010636:Phenols; D059808:Polyphenols; D013634:Tannins; D013729:Terpenes; C071081:oenothein A; D005707:Gallic Acid; C087926:tellimagrandin I