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High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
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Antibacterial brush polypeptide coatings with anionic backbones.

Fangping Yang1, Hao Liu1, Yuansong Wei1

  • 1Institute of Functional Nano and Soft Materials (FUNSOM), Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, China.

Acta Biomaterialia
|November 18, 2022
PubMed
Summary
This summary is machine-generated.

New brush polypeptide coatings with anionic backbones and cationic side-chains effectively prevent bacterial colonization on biomaterials. These coatings show superior antibacterial and biocompatibility properties, offering a promising solution for device-associated infections.

Keywords:
Antibacterial coatingAntimicrobial peptideBiocompatibilityPolypeptideRing-opening polymerization

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Infectious Disease Research

Background:

  • Device-associated infections (DAIs) are a significant clinical challenge, increasing patient morbidity and healthcare costs.
  • Current strategies using antimicrobial peptides (AMPs) or cationic polymers face limitations due to bacterial adhesion and cytotoxicity.
  • Preventing initial bacterial colonization on biomaterial surfaces is critical for mitigating DAIs.

Purpose of the Study:

  • To develop and evaluate novel brush polypeptide coatings with enhanced antibacterial activity and biocompatibility.
  • To investigate the role of cationic side-chain density in the bioactivity of these coatings.
  • To assess the efficacy of these coatings against bacterial adhesion and in vivo infection models.

Main Methods:

  • Synthesis of brush polypeptide coatings with anionic backbones and cationic AMP-mimetic side-chains.
  • Tuning the density of cationic side-chains to optimize surface properties.
  • In vitro evaluation of bactericidal activity, antibacterial adhesion, and cytotoxicity (hemolysis).
  • In vivo assessment of anti-infection efficacy on biomaterial surfaces.

Main Results:

  • Brush polypeptide coatings demonstrated superior bactericidal and antibacterial adhesion properties compared to conventional coatings.
  • Lower cationic side-chain density enhanced cooperative effects, improving both antibacterial activity and adhesion resistance.
  • Coatings exhibited negligible hemolysis and cytotoxicity in vitro.
  • Potent in vivo anti-infection efficacy, achieving ≥99.9% bacterial reduction.

Conclusions:

  • Brush polymers with anionic backbones and cationic side-chains represent a promising design motif for advanced biomaterial coatings.
  • These coatings effectively combat device-associated infections by simultaneously enhancing antibacterial properties and biocompatibility.
  • The developed coatings offer a superior alternative to existing antimicrobial surface modification strategies.