Journal
FEMS MICROBIOLOGY LETTERS
Volume 254, Issue 2, Pages 217-225Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1574-6968.2005.00008.x
Keywords
antibiotic resistance; Pseudomonas aeruginosa; quantitative real-time-PCR (qRT-PCR)
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In Pseudomonas aeruginosa many of the clinically relevant resistance mechanisms result from changes in gene expression as exemplified by the Mex drug efflux pumps, the AmpC beta-lactamase and the carbapenem-specific porin OprD. We used quantitative real-time-PCR to analyze the expression of these genes in susceptible and antibiotic-resistant laboratory and clinical strains. In nalB mutants, which overexpress OprM, we observed a four- to eightfold increase in the expression of mexA, mexB, and oprM genes. MexX and mexY genes were induced eight to 12 times in the presence of 2 mg L-1 tetracycline. The mexC/woprJ and mexE/oprN gene expression levels were increased 30- to 250-fold and 100- to 760-fold in nfxB and nfxC mutants, respectively. We further found that in defined laboratory strains expression levels of ampC and oprD genes paralleled beta-lactamase activity and OprD protein levels, respectively. Our data support the use of quantitative real-time-PCR chain reaction for the analysis of the antimicrobial resistance gene expression in R aeruginosa.
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