Antimicrobial Synthetic Polymers: An Update on Structure-Activity Relationships.

Area of Science:

• Polymer Chemistry
• Antimicrobial Materials
• Drug Discovery

Background:

• Rising antibiotic resistance and declining new drug approvals create a significant therapeutic gap.
• Host Defense Peptides (HDPs), or "Nature's Antibiotics", are crucial components of innate immunity.
• HDPs possess physiochemical properties amenable to synthetic macromolecular design.

Purpose of the Study:

• To review advancements in synthetic polymer-based materials designed to mimic HDP action.
• To highlight progress in the polymethacrylate category for antimicrobial applications.
• To discuss key determinants of antibacterial and hemolytic activity in these synthetic mimics.

Main Methods:

• Exploration of various synthetic polymer architectures (polynorbornenes, poly(meth)acrylates, etc.).
• Focus on polymethacrylate design and optimization, building on pioneering work.
• Analysis of structure-activity relationships, correlating physiochemical properties with biological effects.

Main Results:

• Synthetic polymers demonstrate broad-spectrum antibacterial potency and rapid bactericidal kinetics.
• These materials exhibit minimal toxicity to human cells.
• Key determinants of activity include net cationic charge, facial amphiphilicity, and molecular weight.

Conclusions:

• Synthetic polymers offer a promising, scalable, and cost-effective strategy to address the antibiotic resistance crisis.
• Polymethacrylates represent a particularly successful class of HDP mimics.
• Further research is needed to address future challenges in the development of these antimicrobial agents.