Polysorbate 80 and polymyxin B inhibit Stenotrophomonas maltophilia biofilm

Area of Science:

• Microbiology
• Infectious Diseases
• Biomedical Engineering

Background:

• Stenotrophomonas maltophilia is a multidrug-resistant opportunistic pathogen.
• This bacterium frequently colonizes implanted medical devices by forming biofilms.
• Biofilm formation poses significant challenges in clinical settings.

Purpose of the Study:

• To investigate the inhibitory effects of polysorbate 80 and polymyxin B on Stenotrophomonas maltophilia.
• To evaluate the efficacy of these agents, alone and in combination, against bacterial growth and biofilm development.

Main Methods:

• Minimum Inhibitory Concentration (MIC) assays were performed.
• Biofilm formation assays were conducted.
• The activity of sub-inhibitory concentrations (subMIC) of polysorbate 80 and polymyxin B was assessed.

Main Results:

• Polysorbate 80 and polymyxin B demonstrated inhibitory activity against S. maltophilia.
• A combination of subMIC polymyxin B and polysorbate 80 was significantly more effective than individual agents.
• The combination treatment markedly reduced bacterial growth and inhibited biofilm formation.

Conclusions:

• Combined subMIC polymyxin B and polysorbate 80 represent a potent strategy to control S. maltophilia.
• This approach may offer a novel therapeutic option for preventing or treating infections associated with medical devices.
• Further research is warranted to explore clinical applications of this synergistic combination.