Tissue Plasminogen Activator Coating on Implant Surfaces Reduces Staphylococcus aureus Biofilm Formation

Area of Science:

• Biomedical Engineering
• Infectious Diseases
• Materials Science

Background:

• Staphylococcus aureus biofilms on medical devices present significant challenges due to high prevalence and antibiotic resistance.
• Fibrin is a key component in Staphylococcus aureus biofilm development, highlighting a potential target for prevention strategies.

Purpose of the Study:

• To investigate the efficacy of coating implant surfaces with fibrinolytic agents as a novel antibiofilm prophylaxis method.
• To evaluate the potential of tissue plasminogen activator (tPA) coating in preventing Staphylococcus aureus biofilm formation.

Main Methods:

• In vitro microplate biofilm assays were performed to assess tPA coating's effect on S. aureus biofilm formation.
• An in vivo mouse model of biofilm infection was utilized to evaluate the antibiofilm efficacy of tPA coating on implant surfaces.
• Plasminogen activation and subsequent fibrin cleavage by tPA were analyzed to understand the mechanism of action.

Main Results:

• tPA coating significantly inhibited biofilm formation across various Staphylococcus aureus strains.
• The antibiofilm effect of tPA was dependent on plasminogen activation and local fibrin cleavage.
• tPA coating prevented both initial bacterial adhesion and subsequent biofilm biomass accumulation.
• tPA-coated implants demonstrated increased susceptibility of biofilm infections to antibiotics.
• In vivo studies showed significantly reduced bacterial presence on tPA-coated implants compared to controls.

Conclusions:

• Fibrinolytic coatings, specifically using tPA, offer a promising strategy for reducing Staphylococcus aureus biofilm formation.
• This approach demonstrates potential for preventing bacterial biofilm infections associated with indwelling medical devices.
• tPA coating represents a novel method for enhancing the safety and efficacy of medical implants.