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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2015.1
- 수록면
- 98 - 104 (7page)
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Background: Fluoroquinolone resistance in Pseudomonas aeruginosa may be due to efflux pump overexpression and/or target mutations.
We designed this study to investigate the efflux pump mediated fluoroquinolone resistance and check the increasing effectiveness of fluoroquinolones in combination with an efflux pumps inhibitor among P. aeruginosa isolates from burn wounds infections.
Materials and Methods: A total of 154 consecutive strains of P. aeruginosa were recovered from separate patients hospitalized in a burn hospital, Tehran, Iran. The isolates first were studied by disk diffusion antibiogram for 11 antibiotics and then minimum inhibitory concentration (MIC) experiments were performed to detect synergy between ciprofloxacin and the efflux pump inhibitor, carbonyl cyanide- m-chlorophenyl hydrazone (CCCP). Then to elucidate the inducing of multi drug resistance due to different efflux pumps activation in Fluoroquinolone resistant isolates, synergy experiments were also performed in random ciprofloxacin resistant isolates which have overexpressed efflux pumps phenotypically, using CCCP and selected antibiotics as markers for Beta-lactams and Aminoglycosides.
The isolates were also tested by polymerase chain reaction (PCR) for the presence of the MexA, MexC and MexE, which encode the efflux pumps MexAB-OprM, MexCD-OprJ and MexEF-OprN.
Results: Most of the isolates were resistant to 3 or more antibiotics tested. More than half of the ciprofloxacin resistant isolates exhibited synergy between ciprofloxacin and CCCP, indicating the efflux pump activity contributed to the ciprofloxacin resistance.
Also increased susceptibility of random ciprofloxacin resistant isolates of P. aeruginosa to other selected antibiotics, in presence of CCCP, implied multidrug extrusion by different active efflux pump in fluoroquinolones resistant strains. All of Ciprofloxacin resistant isolates were positive for MexA, MexC and MexE genes simultaneously.
Conclusion: In this burn hospital, where multidrug resistant P. aeruginosa isolates were prevalent, ciprofloxacin resistance and multidrug resistance due to the overexpression of fluoroquinolones mediated efflux pumps has also now emerged. Early recognition of this resistance mechanism should allow the use of alternative antibiotics and use an efflux pumps inhibitor in combination with antibiotic therapy.
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참고문헌 (22)
참고문헌 신청
Askoura M / 2011 / Efflux pump inhibitors (EPIs) as new antimicrobial agents against Pseudomonas aeruginosa / Libyan J Med 6 : 5870 ~
Barrow G / 2003 / Characters of gram-negative bacteria in Cowan & steel manual for identification of medical bacteria : 130 ~ 131
Bonfiglio G / 1998 / Antibiotic resistance in Pseudomonas aeruginosa: an Italian survey / J Antimicrob Chemother 41 : 307 ~ 310
Chuanchuen R / 2002 / The MexJK efflux pump of Pseudomonas aeruginosa requires OprM for antibiotic efflux but not for efflux of triclo / J Bacteriol 184 : 5036 ~ 5044
Clinical and Laboratory Standards Institute / 2010 / Performance standards for antimicrobial susceptibility testing; twenty-second informational supplement / CLSI
Barrow G / 2003 / Characters of gram-negative bacteria in Cowan & steel manual for identification of medical bacteria : 130 ~ 131
Bonfiglio G / 1998 / Antibiotic resistance in Pseudomonas aeruginosa: an Italian survey / J Antimicrob Chemother 41 : 307 ~ 310
Chuanchuen R / 2002 / The MexJK efflux pump of Pseudomonas aeruginosa requires OprM for antibiotic efflux but not for efflux of triclo / J Bacteriol 184 : 5036 ~ 5044
Clinical and Laboratory Standards Institute / 2010 / Performance standards for antimicrobial susceptibility testing; twenty-second informational supplement / CLSI
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