Inhibition of F'lac transfer by various antibacterial drugs in Escherichia coli
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E A Debbia1, S Massaro, U Campora
1Institute of Microbiology, University of Genoa, Italy.
Abstract:
Several antimicrobial agents including mitomycin C and molecules belonging to the 4-quinolone, aminoglycoside and beta-lactam groups inhibited plasmid transfer to a varying extent, in actively growing Escherichia coli. In contrast, the same antibiotics did not prevent effective conjugation in nongrowing bacteria with the exception of mitomycin C. These results indicate that the drugs inhibit plasmid transfer by interfering with bacterial host functions rather than by recognizing a specific plasmid-mediated target. Several drugs are therefore capable, in principle, of reducing the spread of plasmid-mediated antibiotic resistance.
Insights
Antimicrobial drugs like mitomycin C and beta-lactams can inhibit plasmid transfer in growing bacteria. This suggests these drugs may reduce the spread of antibiotic resistance by targeting bacterial functions.
Area of Science:
- Microbiology
- Molecular Biology
- Genetics
Background:
- Antibiotic resistance is a growing global health threat.
- Plasmids are key vectors for the spread of antibiotic resistance genes.
- Understanding factors that inhibit plasmid transfer is crucial for combating resistance.
Purpose of the Study:
- To investigate the effect of various antimicrobial agents on plasmid transfer in Escherichia coli.
- To determine whether inhibition of plasmid transfer is dependent on bacterial growth state.
- To elucidate the mechanism by which antimicrobial drugs affect conjugation.
Main Methods:
- Assessing plasmid transfer rates in actively growing and non-growing Escherichia coli.
- Utilizing a range of antimicrobial agents, including mitomycin C, 4-quinolones, aminoglycosides, and beta-lactams.
- Comparing the efficacy of different drug classes in inhibiting conjugation.
Main Results:
- Antimicrobial agents, including 4-quinolones, aminoglycosides, and beta-lactams, inhibited plasmid transfer in growing Escherichia coli.
- Non-growing bacteria showed resistance to most tested antibiotics regarding plasmid transfer inhibition, except for mitomycin C.
- Inhibition of plasmid transfer appears to target bacterial host functions rather than specific plasmid-mediated mechanisms.
Conclusions:
- Antimicrobial drugs can reduce the spread of antibiotic resistance by interfering with plasmid transfer.
- The efficacy of these drugs in inhibiting plasmid transfer is dependent on the metabolic state of the bacterial host.
- Targeting bacterial host functions offers a potential strategy to control the dissemination of antimicrobial resistance.