title: Restoration of effectiveness of beta-lactams on methicillin-resistant Staphylococcus aureus by tellimagrandin I from rose red.
abstract: We found that extract from petals of Rosa canina L. (rose red) strikingly reduced the minimum inhibitory concentration of beta-lactams in methicillin-resistant Staphylococcus aureus. We isolated two compounds that reduced the minimum inhibitory concentrations of beta-lactams from the extract, tellimagrandin I and rugosin B. Tellimagrandin I was very effective regarding the reduction of the minimum inhibitory concentration, and rugosin B showed some effect. Tellimagrandin I showed a weak bactericidal action when added together with oxacillin. Judging from the fractional inhibitory concentration index, the effect of tellimagrandin I and oxacillin was synergistic. Tellimagrandin I also significantly reduced the minimum inhibitory concentration of tetracycline in some strains of methicillin-resistant Staphylococcus aureus.
authors.affiliation: Department of Microbiology, Faculty of Pharmaceutical Sciences, Okayama University, Tsushima, Okayama, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Shiota
authors.forename: M
authors.initials: M
authors.lastname: Shimizu
authors.forename: T
authors.initials: T
authors.lastname: Mizusima
authors.forename: H
authors.initials: H
authors.lastname: Ito
authors.forename: T
authors.initials: T
authors.lastname: Hatano
authors.forename: T
authors.initials: T
authors.lastname: Yoshida
authors.forename: T
authors.initials: T
authors.lastname: Tsuchiya
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D004352:Drug Resistance, Microbial; D005707:Gallic Acid / Q000031:analogs & derivatives* / Q000494:pharmacology; D005960:Glucosides / Q000494:pharmacology*; D006801:Humans; D016106:Methicillin Resistance; D008826:Microbial Sensitivity Tests; D010936:Plant Extracts / Q000494:pharmacology; D013203:Staphylococcal Infections / Q000382:microbiology; D013211:Staphylococcus aureus / Q000187:drug effects*; D047090:beta-Lactams
chemical_list: D000900:Anti-Bacterial Agents; D005960:Glucosides; D010936:Plant Extracts; D047090:beta-Lactams; D005707:Gallic Acid; C087926:tellimagrandin I