Journal
INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS
Volume 29, Issue 6, Pages 700-704Publisher
ELSEVIER
DOI: 10.1016/j.ijantimicag.2007.01.007
Keywords
subinhibitory concentrations; amikacin; ciprofloxacin; hydrophobicity; adherence
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The effect of subinhibitory concentrations of amikacin and ciprofloxacin on the hydrophobicity and adherence to uroepithelial cells of Escherichia coli strains was investigated. The hydrophobicity of the tested strains was evaluated by the bacterial adherence to hydrocarbon-xylene test and by the salt aggregation test of ammonium sulphate. The hydrophobic character of strains exposed to 1/2 to 1/8 minimal inhibitory concentration (MIC) of amikacin and 1/2 to 1/16 MIC of ciprofloxacin was altered to a hydrophilic state. Results of the SAT also correlated with these data. Moreover, comparisons were made between the number of bacteria attached to the epithelial cells before and after exposure to 1/2, 1/4 and 1/8 MIC of antibiotics. The greatest loss of adherence capability occurred at 1/2 MIC of ciprofloxacin. In conclusion, antibiotics are often present at sub-MICs and may still be effective in reducing bacterial virulence by interfering with bacterial cell functions. (c) 2007 Elsevier B.V. and the International Society of Chemotherapy. All rights reserved.
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