Phage-induced efflux down-regulation boosts antibiotic efficacy

Area of Science:

• Microbiology
• Bacteriology
• Virology

Background:

• Bacterial and phage interactions are complex and influenced by physiological changes.
• Understanding these interactions is key for predicting population dynamics and developing phage-antibiotic therapies.
• Stationary phase bacteria present treatment challenges due to emerging phage resistance.

Purpose of the Study:

• To investigate the interactions between stationary phase Burkholderia thailandensis and phage ΦBp-AMP1.
• To elucidate the molecular mechanisms underlying phage-antibiotic synergy and antagonism.
• To explore the potential of phage-antibiotic combinations for treating bacterial infections.

Main Methods:

• Studied interactions between Burkholderia thailandensis and phage ΦBp-AMP1.
• Assessed the impact of phage presence on antibiotic efficacy across different drug classes.
• Investigated the role of antibiotic efflux in phage-mediated synergy.

Main Results:

• B. thailandensis rapidly develops genetic resistance to phage.
• Phage presence enhances efficacy of quinolones, beta-lactams, and tetracyclines.
• Phage antagonizes tetrahydrofolate synthesis inhibitors.
• Reduced antibiotic efflux in the presence of phage facilitates enhanced efficacy.

Conclusions:

• Phage-antibiotic therapy can eradicate stationary phase bacteria.
• This combination therapy requires lower antibiotic concentrations, beneficial for difficult-to-treat infections.
• Phage-antibiotic combinations offer a promising strategy for combating bacterial infections.