Abstract
The NorA efflux pump lowers intracellular fluoroquinolone concentrations by expelling antibiotics through the membrane of Staphylococcus aureus. We identified 3-aryl-4-methyl-2-quinolin-2-ones as compounds able to restore the activity of the NorA substrate, ciprofloxacin, against resistant S. aureus strains, and acting as efflux pump inhibitors (EPI). In particular, 5-hydroxy-7-methoxy-4-methyl-3-phenylquinolin-2-one (6 c) presents both an EPI and an antimicrobial effect. Its efficacy and safety make it a potential candidate for further investigations.
Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Animals
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Anti-Bacterial Agents / chemistry
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Anti-Bacterial Agents / pharmacology*
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Anti-Bacterial Agents / toxicity
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Bacterial Proteins / antagonists & inhibitors
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Bacterial Proteins / metabolism
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Cell Line
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Cell Survival / drug effects
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Ciprofloxacin / pharmacology
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Drug Resistance, Multiple, Bacterial
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Humans
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Mice
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Mice, Inbred BALB C
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Microbial Sensitivity Tests
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Multidrug Resistance-Associated Proteins / antagonists & inhibitors
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Multidrug Resistance-Associated Proteins / metabolism
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Quinolones / chemistry*
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Quinolones / pharmacology
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Quinolones / toxicity
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Staphylococcus aureus / drug effects*
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Staphylococcus aureus / metabolism
Substances
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Anti-Bacterial Agents
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Bacterial Proteins
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Multidrug Resistance-Associated Proteins
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Quinolones
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NorA protein, Staphylococcus
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Ciprofloxacin