A Cationic Amphiphilic Random Copolymer with pH-Responsive Activity against Methicillin-Resistant Staphylococcus...

Area of Science:

• Biochemistry
• Materials Science
• Microbiology

Background:

• Drug-resistant Staphylococcus aureus poses a significant threat to public health.
• Developing novel antimicrobial agents is crucial for combating infections.
• Cationic, amphiphilic polymers show promise as antimicrobial agents.

Purpose of the Study:

• To investigate the pH-dependent antimicrobial activity of a novel cationic, amphiphilic random copolymer.
• To evaluate the polymer's efficacy against clinical isolates of drug-resistant Staphylococcus aureus.
• To assess the polymer's safety profile regarding human cells.

Main Methods:

• In vitro antimicrobial assays were performed against clinical isolates of methicillin-resistant and vancomycin-intermediate S. aureus.
• The polymer's activity was tested at different pH values (acidic and neutral).
• Hemolytic activity and cytotoxicity assays were conducted using human red blood cells and dermal fibroblasts.

Main Results:

• The cationic polymer demonstrated pH-dependent bactericidal activity against S. aureus.
• Antimicrobial activity was observed at neutral pH but was lost under acidic conditions.
• The polymer exhibited no significant hemolytic activity or cytotoxicity towards human cells across a pH range of 5.5-7.4.

Conclusions:

• The developed cationic polymer is a selective antimicrobial agent effective against drug-resistant S. aureus.
• Its pH-dependent activity suggests potential for targeted therapy in skin infections.
• The polymer's safety profile indicates a favorable therapeutic window for potential clinical applications.