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Antimicrobial Agents and Chemotherapy, May 2000, p. 1223-1228, Vol. 44, No. 5
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Evidence for Active Efflux as the Primary Mechanism of Resistance to Ciprofloxacin in Salmonella enterica Serovar Typhimurium

Etienne Giraud, Axel Cloeckaert, Dominique Kerboeuf, and Elisabeth Chaslus-Dancla*

Station de Pathologie Aviaire et de Parasitologie, Institut National de la Recherche Agronomique, Centre de Recherche de Tours-Nouzilly, 37380 Monnaie, France

Received 30 July 1999/Returned for modification 3 November 1999/Accepted 31 January 2000

The occurrence of active efflux and cell wall modifications were studied in Salmonella enterica serovar Typhimurium mutants that were selected with enrofloxacin and whose phenotypes of resistance to fluoroquinolones could not be explained only by mutations in the genes coding for gyrase or topoisomerase IV. Mutant BN18/21 exhibited a decreased susceptibility to ciprofloxacin (MIC = 0.125 µg/ml) but did not have a mutation in the gyrA gene. Mutants BN18/41 and BN18/71 had the same substitution, Gly81Cys in GyrA, but exhibited different levels of resistance to ciprofloxacin (MICs = 2 and 8 µg/ml, respectively). None of the mutants had mutations in the parC gene. Evidence for active efflux was provided by a classical fluorimetric method, which revealed a three- to fourfold decrease in ciprofloxacin accumulation in the three mutants compared to that in the parent strain, which was annuled by addition of the efflux pump inhibitor carbonyl cyanide m-chlorophenylhydrazone. In mutant BN18/71, a second fluorimetric method also showed a 50% reduction in the level of accumulation of ethidium bromide, a known efflux pump substrate. Immunoblotting and enzyme-linked immunosorbent assay experiments with an anti-AcrA antibody revealed that the resistance phenotype was strongly correlated with the expression level of the AcrAB efflux pump and suggested that decreased susceptibility to ciprofloxacin due to active efflux probably related to overproduction of this pump could occur before that due to gyrA mutations. Alterations were also found in the outer membrane protein and lipopolysaccharide profiles of the mutants, and these alterations were possibly responsible for the decrease in the permeability of the outer membrane that was observed in the mutants and that could act synergistically with active efflux to decrease the level of ciprofloxacin accumulation.

* Corresponding author. Mailing address: Station de Pathologie Aviaire et de Parasitologie, Institut National de la Recherche Agronomique, Centre de Recherche de Tours-Nouzilly, 37380 Monnaie, France. Phone: 33-2-47-42-77-65. Fax: 33-2-47-42-77-74. E-mail address: chaslus{at}tours.inra.fr.

Antimicrobial Agents and Chemotherapy, May 2000, p. 1223-1228, Vol. 44, No. 5
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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