期刊
JOURNAL OF VETERINARY MEDICAL SCIENCE
卷 75, 期 4, 页码 407-414出版社
JAPAN SOC VET SCI
DOI: 10.1292/jvms.12-0186
关键词
E. coli; efflux pump; enrofloxacin; fluoroquinolone resistance
资金
- Japanese Ministry of Health, Labour, and Welfare [H21-Shokuhin-Ippan-013]
- Japan Ministry of Education, Culture, Sports, Science and Technology
Fluoroquinolone resistance is mainly caused by mutations in quinolone resistance-determining regions of DNA gyrase and topoisomerase IV in Escherichia coli. The AcrAB-TolC efflux pump contributes to resistance against fluoroquinolone and other antimicrobials. In this study, we investigated a high-level mechanism of fluoroquinolone resistance in E. coli that was isolated from human clinical samples and canine fecal samples. E. coli strains with high levels of fluoroquinolone resistance have been found to be frequently resistant to cephalosporins. Strains with high-level fluoroquinolone resistance exhibited lower intracellular enrofloxacin (ENR) concentrations, higher expression of AcrA, and a greater reduction in the fluoroquinolone minimum inhibitory concentration for treatment with an efflux pump inhibitor. The frequency of strains with enhanced ENR resistance selection and the survival rate of E. coli in the presence of ENR in vitro were correlated well with AcrA protein expression levels in the parental strains. These results suggest that AcrAB-TolC efflux pump over-expression is related to high-level fluoroquinolone resistance and the selection of strains with enhanced fluoroquinolone resistance.
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