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Related Experiment Video

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High-throughput Identification of Bacteria Repellent Polymers for Medical Devices
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Engineering bio-adhesive functions in an antimicrobial polymer multilayer.

Tao He1, Ying Zhang, Alvin C K Lai

  • 1Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, 117602, Singapore.

Biomedical Materials (Bristol, England)
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Summary

This study engineered antimicrobial biomaterials with selective cell adhesion. Collagen (CL) promoted host cell adhesion but also bacterial adhesion, while RGD peptides enhanced host cells without increasing bacterial adhesion, offering tailored implant surfaces.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Cell Biology

Background:

  • Biomaterial surface functionalization with adhesive ligands promotes cell adhesion.
  • Ideally, biomaterials for implants should promote host cell adhesion while inhibiting bacterial adhesion.
  • Designing antimicrobial biomaterials with selective adhesiveness is crucial but underexplored.

Purpose of the Study:

  • To elucidate the role of RGD peptide and collagen (CL) as adhesive ligands on the bioadhesion functions of a model antimicrobial film.
  • To investigate the selective adhesion of host cells (fibroblasts) and bacteria (Staphylococcus aureus, Escherichia coli) on functionalized antimicrobial surfaces.
  • To demonstrate the possibility of engineering antimicrobial coatings with tailored adhesive properties for biomedical implants.

Main Methods:

  • Chemically coupled RGD peptide or collagen (CL) to dextran sulfate (DS)/chitosan (CS) antimicrobial multilayer films.
  • Quantified immobilized ligand density using nanogram per square centimeter (ng cm⁻²) measurements.
  • Investigated fibroblast and bacterial adhesion and proliferation using density and morphology analysis.
  • Measured bacterial detachment forces using atomic force microscopy (AFM).

Main Results:

  • RGD and CL effectively promoted fibroblast adhesion and proliferation in a concentration-dependent manner.
  • Immobilized RGD did not enhance Staphylococcus aureus and Escherichia coli adhesion.
  • Collagen (CL) significantly increased Staphylococcus aureus adhesion, with higher detachment forces, but decreased Escherichia coli adhesion.
  • Atomic force microscopy (AFM) revealed significantly higher S. aureus detachment forces on CL-coated surfaces.

Conclusions:

  • Antimicrobial multilayer coatings can be engineered with tailored adhesive properties by selecting specific ligands.
  • RGD peptides offer a promising strategy for promoting host cell adhesion without increasing bacterial adhesion.
  • Collagen (CL) exhibits differential effects on bacterial adhesion, promoting S. aureus while inhibiting E. coli, highlighting the importance of ligand choice.
  • These findings support the development of advanced biomaterials for biomedical implants with selective bioadhesion characteristics.