Synergistic Effect of Kaempferol Glycosides Purified from Laurus nobilis and Fluoroquinolones on Methicillin-Resistant Staphylococcus aureus

In a previous study, we reported that two kaempferol glycosides isolated from Laurus nobilis L., kaempferol-3-O-α-L-(2″,4″-di-E-p-coumaroyl)-rhamnoside (C2) and kaempferol-3-O-α-L-(2″-E-p-coumaroyl-4″-Z-p-coumaroyl)-rhamnoside (C3), showed strong antibacterial activities against methicillin-resistan...

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Bibliographic Details
Published in:Biological & Pharmaceutical Bulletin 2009/03/01, Vol.32(3), pp.489-492
Main Authors: Liu, Mei-Hua, Otsuka, Nao, Noyori, Kumiko, Shiota, Sumiko, Ogawa, Wakano, Kuroda, Teruo, Hatano, Tsutomu, Tsuchiya, Tomofusa
Format: Article
Language:English
Subjects:
Anti-Bacterial Agents - isolation & purification
Anti-Bacterial Agents - pharmacology
Coumaric Acids - isolation & purification
Coumaric Acids - pharmacology
Drug Synergism
Fluoroquinolones - isolation & purification
Fluoroquinolones - pharmacology
Glycosides - isolation & purification
Glycosides - physiology
kaempferol glycoside
Kaempferols - isolation & purification
Kaempferols - pharmacology
Laurus - chemistry
Laurus nobilis
methicillin-resistant Staphylococcus aureus
Methicillin-Resistant Staphylococcus aureus - drug effects
Microbial Sensitivity Tests
norfloxacin
Staphylococcus aureus
synergistic effect
topoisomerase IV
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Summary:In a previous study, we reported that two kaempferol glycosides isolated from Laurus nobilis L., kaempferol-3-O-α-L-(2″,4″-di-E-p-coumaroyl)-rhamnoside (C2) and kaempferol-3-O-α-L-(2″-E-p-coumaroyl-4″-Z-p-coumaroyl)-rhamnoside (C3), showed strong antibacterial activities against methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci. Thereafter we found that these compounds greatly reduced the minimum inhibitory concentrations (MICs) of some fluoroquinolones in MRSA. In other words, C2 and C3 greatly potentiated anti-MRSA activity of fluoroquinolones. The effect of C2 and C3 with fluoroquinolones was found to be synergistic. The potentiation activity was observed with hydrophilic fluoroquinolones, such as norfloxacin and ciprofloxacin, but not with hydrophobic quinolones. We also found that norfloxacin reduced MICs of C2 and C3. The effect was synergistic. Possible mechanism of the synergistic effect was discussed.
ISSN:0918-6158
1347-5215
DOI:10.1248/bpb.32.489