Polymicrobial antibiofilm activity of the membranotropic peptide gH625 and its analogue

Area of Science:

• Microbiology
• Biotechnology
• Materials Science

Background:

• Polymicrobial biofilms, involving fungi like Candida and bacteria, are a significant cause of persistent infections.
• These mixed biofilms frequently lead to the failure of medical silicone devices.
• Polymicrobial biofilms exhibit greater drug resistance compared to single-species biofilms.

Purpose of the Study:

• To investigate the efficacy of the membranotropic peptide gH625 and its derivative gH625-GCGKKK in preventing and eliminating polymicrobial biofilms.
• To assess the peptide's impact on biofilm architecture and its potential for medical applications.

Main Methods:

• Inhibition and eradication of biofilms were assessed using complementary methods.
• Key techniques included XTT-reduction assays and crystal violet staining (CV).
• The study utilized clinical isolates of Candida tropicalis, Serratia marcescens, and Staphylococcus aureus.

Main Results:

• The peptide derivative gH625-GCGKKK demonstrated superior performance compared to the native gH625 peptide.
• It significantly inhibited the formation of mixed biofilms composed of C. tropicalis/S. marcescens and C. tropicalis/S. aureus.
• The peptide reduced biofilm architecture by interfering with cell adhesion and the polymeric matrix, and eradicated long-term biofilms from silicone surfaces.

Conclusions:

• The peptide gH625-GCGKKK is a potent agent against polymicrobial biofilm formation and maintenance.
• This peptide derivative offers a promising strategy for combating challenging biofilm-related infections and medical device complications.