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Pyocin sensitivity of pseudomonas aeruginosa pretreated with antibiotics
Canadian Journal of Microbiology
|May 1, 1977
Abstract:
Strains of Pseudomonas aeruginosa exposed to subinhibitory concentrations of either polymyxin B, gentamicin, or carbenicillin were compared with untreated organisms for changes in sensitivity to pyocin. Pretreatment with polymyxin B or gentamicin resulted in a decreased sensitivity to pyocin, while carbenicllin pretreatment did not alter pyocin sensitivity.
Insights
Subinhibitory antibiotic concentrations of polymyxin B and gentamicin decrease Pseudomonas aeruginosa sensitivity to pyocins. Carbenicillin, however, did not affect pyocin sensitivity in this study.
Area of Science:
- Microbiology
- Bacteriology
- Antimicrobial Resistance
Background:
- Pseudomonas aeruginosa is an opportunistic pathogen.
- Pyocins are bacteriocins produced by P. aeruginosa.
- Antibiotic pretreatment can alter bacterial susceptibility.
Purpose of the Study:
- To investigate the effect of subinhibitory antibiotic concentrations on P. aeruginosa pyocin sensitivity.
- To compare the impact of polymyxin B, gentamicin, and carbenicillin on pyocin susceptibility.
Main Methods:
- Exposing P. aeruginosa strains to subinhibitory concentrations of polymyxin B, gentamicin, or carbenicillin.
- Comparing pyocin sensitivity of pretreated strains against untreated controls.
Main Results:
- Polymyxin B and gentamicin pretreatment led to reduced pyocin sensitivity.
- Carbenicillin pretreatment did not significantly alter pyocin sensitivity.
Conclusions:
- Certain antibiotics, like polymyxin B and gentamicin, can modulate P. aeruginosa's susceptibility to pyocins.
- This interaction may have implications for understanding P. aeruginosa virulence and treatment strategies.