Inhibitory effects of polysorbate 80 on MRSA biofilm formed on different substrates including dermal tissue

Area of Science:

• Microbiology
• Biomaterials Science
• Medical Chemistry

Background:

• Methicillin-resistant Staphylococcus aureus (MRSA) forms persistent biofilms on necrotic tissues and medical devices.
• Surfactants are known to affect biofilms, but their mechanisms and clinical applicability require further investigation.
• Minimizing cytotoxicity is crucial for clinical use of surfactants in treating MRSA infections.

Purpose of the Study:

• To investigate the inhibitory effects of four surfactants on MRSA biofilm formation.
• To identify the most suitable surfactant with minimal cytotoxicity for clinical applications.
• To elucidate the mechanism of action and substrate-dependency of effective surfactants.

Main Methods:

• Screening of four different surfactants for their impact on MRSA biofilm formation.
• Assessment of bacterial adhesion inhibition versus biofilm disruption.
• Evaluation of cytotoxicity of effective surfactants on 3T3 fibroblasts.
• Testing the substrate-dependent efficacy of surfactants on plastic, silicon, dermal tissues, and stainless-steel.

Main Results:

• Polysorbate 80 (PS80), a nonionic surfactant, demonstrated the most significant MRSA biofilm inhibitory effect.
• PS80 inhibited bacterial adhesion to substrates rather than disrupting pre-formed biofilms.
• The effective concentration of PS80 exhibited low cytotoxicity towards 3T3 fibroblasts.
• PS80's efficacy was substrate-dependent, showing positive effects on plastic, silicon, and dermal tissues, but not on stainless-steel.

Conclusions:

• PS80 is effective in preventing MRSA biofilm formation on various substrates, including tissues and foreign bodies.
• The mechanism involves inhibition of bacterial adhesion, with minimal cytotoxicity.
• PS80 holds potential for clinical use as a wound washing solution or for pretreatment of indwelling catheters to prevent MRSA biofilms.