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Antimicrobial Agents and Chemotherapy, June 2000, p. 1428-1437, Vol. 44, No. 6
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Induction of Fibronectin-Binding Proteins and Increased Adhesion of Quinolone-Resistant Staphylococcus aureus by Subinhibitory Levels of Ciprofloxacin

Carmelo Bisognano,1 Pierre Vaudaux,1,* Peter Rohner,1 Daniel P. Lew,1 and David C. Hooper2

Division of Infectious Diseases, University Hospital, CH-1211 Geneva 14, Switzerland,1 and Infectious Disease Unit, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114-26962

Received 11 October 1999/Returned for modification 10 December 1999/Accepted 29 February 2000

We recently reported that strain EN1252a, a fluoroquinolone-resistant derivative of Staphylococcus aureus NCTC8325 with mutations in grlA and gyrA, expressed increased levels of fibronectin-binding proteins (FnBPs) and showed a significantly higher attachment to fibronectin-coated polymer surfaces after growth in the presence of subinhibitory concentrations of ciprofloxacin. The present study evaluated the occurrence and frequency of fluoroquinolone-induced FnBP-mediated adhesion in clinical isolates of fluoroquinolone-resistant methicillin-resistant S. aureus (MRSA) and methicillin-susceptible S. aureus (MSSA). Eight of ten MRSA isolates and four of six MSSA isolates with grlA and gyrA mutations exhibited significant increases in attachment to fibronectin-coated surfaces after growth in the presence of one-quarter the MIC of ciprofloxacin. Fluoroquinolone-induced FnBP-mediated adhesion of one clinical MRSA strain and the double mutant strain EN1252a also occurred on coverslips removed from the subcutaneous space of guinea pigs. For strain EN1252a, the regulation of fnb transcription by sub-MICs of ciprofloxacin was studied on reporter plasmids carrying fnb-luxAB fusions. One-quarter of the MIC of ciprofloxacin significantly increased fnbB, but not fnbA, promoter activity of the fluoroquinolone-resistant mutant but not its fluoroquinolone-susceptible parent ISP794. This response was abolished by pretreatment with rifampin, indicating an effect at the level of transcription. Activation of the fnbB promoter was not due to an indirect effect of ciprofloxacin on growth rate and still occurred in an agr mutant of strain EN1252a. These data suggest that sub-MIC levels of ciprofloxacin activate the fnbB promoter of some laboratory and clinical isolates, thus contributing to increased production of FnBP(s) and leading to higher levels of bacterial attachment to fibronectin-coated or subcutaneously implanted coverslips.

* Corresponding author. Mailing address: Division of Infectious Diseases, University Hospital, CH 1211 Geneva 14, Switzerland. Phone: (4122) 37 29 826. Fax: (4122) 37 29 830. E-mail: Pierre.Vaudaux{at}hcuge.ch.

Antimicrobial Agents and Chemotherapy, June 2000, p. 1428-1437, Vol. 44, No. 6
0066-4804/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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