Cationic Antimicrobial Carbon Acid Polymer Eradicates Pseudomonas aeruginosa and Staphylococcus aureus Biofilms

Area of Science:

• Antimicrobial polymers
• Wound infection treatment
• Biofilm eradication

Background:

• Biofilm-associated infections are difficult to treat due to high antimicrobial tolerance.
• Pseudomonas aeruginosa and Staphylococcus aureus are key pathogens in wound infections.
• Current treatments face challenges with multidrug-resistant (MDR) bacteria.

Purpose of the Study:

• To develop and evaluate a novel main-chain cationic antimicrobial polymer, poly(butylimidazolium) (PIM1).
• To assess PIM1's efficacy against MDR bacteria and biofilms in wound infections.
• To determine PIM1's safety and therapeutic potential in vivo.

Main Methods:

• Synthesis and characterization of poly(butylimidazolium) (PIM1).
• In vitro testing of PIM1 against MDR bacteria, persister cells, and biofilms.
• In vivo efficacy and toxicity studies in murine wound infection models.

Main Results:

• PIM1 exhibited broad-spectrum bactericidal activity with low cytotoxicity.
• PIM1 demonstrated potent activity under physiological conditions, including serum presence.
• PIM1 eradicated established biofilms and persister cells in vitro.
• Topical PIM1 treatment in murine models achieved >99% eradication of P. aeruginosa and S. aureus biofilms.
• No observable toxicity was noted with continuous topical PIM1 administration.

Conclusions:

• PIM1 is a potent antimicrobial agent effective against MDR bacteria and biofilms.
• PIM1 demonstrates safety and efficacy for treating biofilm-associated wound infections.
• PIM1 represents a promising therapeutic candidate for challenging wound infections.