Abstract
The influence of subinhibitory concentrations (1/2, 1/4, 1/8, 1/16 and 1/32 MIC) of amikacin and ciprofloxacin on the morphology and adherence of uropathogenic strains was studied. Intensity of morphological changes was proportional to the concentrations of these antibiotics. Morphological changes were the most prominent after bacterial exposure to sub-MICs of ciprofloxacin. These concentrations, especially 1/2 MIC of ciprofloxacin, induced the formation of filaments ofE. coli, K. pneumoniae, K. oxytoca, E. cloacae andA. calcoaceticus biotypeanitratus. No morphological changes were observed inP. aeruginosa, S. epidermidis andS. aureus cells after exposure to subinhibitory concentrations of both antibiotics. Sub-MICs of amikacin affected the changes in cell shape only slightly. The exposure of bacterial strains to 1/2 MIC of ciprofloxacin induced increased vacuolation of the cells. We observed shrinkage of the protoplasm and the pleated cell walls in comparison with control cells. The greatest loss of adherence ability occurred at 1/2 MIC of ciprofloxacin after a 1-d incubation.
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Abbreviations
- Ami:
-
amikacin
- MHB:
-
Mueller-Hinton broth
- MIC(s):
-
minimum inhibitory concentration(s)
- PBS:
-
phosphate-buffered saline
- Cip:
-
ciprofloxacin
- SEM:
-
scanning electron microscope
- sub-MIC(s):
-
sub-minimum inhibitory concentration(s)
- TEM:
-
transmission electron microscope
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Wojnicz, D., Kłak, M., Adamski, R. et al. Influence of subinhibitory concentrations of amikacin and ciprofloxacin on morphology and adherence ability of uropathogenic strains. Folia Microbiol 52, 429–436 (2007). https://doi.org/10.1007/BF02932099
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DOI: https://doi.org/10.1007/BF02932099