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Related Experiment Video

Updated: Sep 11, 2025

In Vivo Mouse Model of Spinal Implant Infection
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Biologically Active Implants Prevent Mortality in a Mouse Sepsis Model.

Martin Stark1, Fereshteh Bayat1, Sara Rahmani1

  • 1School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S 4K1, Canada.

Advanced Healthcare Materials
|August 16, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel triple-action titanium implant using bacteriophages to prevent implant-associated infections. The engineered biomaterial demonstrates significant bacterial reduction and enhances survival rates in infection models.

Keywords:
antibacterial‐coatingbacteriophagesmedical implantmouse sepsis model

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Area of Science:

  • Biomaterials Science
  • Infectious Diseases
  • Nanotechnology

Background:

  • Implant-associated infections are a major clinical challenge, often leading to severe complications like chronic infection, tissue damage, and implant failure.
  • Current treatments for implant infections are often insufficient, necessitating the development of advanced preventative strategies.

Purpose of the Study:

  • To develop a modular, triple-action titanium implant with integrated bacterial repellency, bactericidal activity, and enhanced tissue integration.
  • To evaluate the efficacy of the engineered implant against bacterial pathogens and in a sepsis survival model.

Main Methods:

  • Medical-grade titanium implants were coated with bacteriophages and collagen embedded in a repellent lubricant layer.
  • In vitro testing involved assessing bacterial load reduction against Pseudomonas aeruginosa and Staphylococcus aureus.
  • In vivo evaluation utilized a sepsis survival model in mice challenged with Pseudomonas aeruginosa infection.

Main Results:

  • The phage-activated coating significantly reduced bacterial load by over 3 logs for P. aeruginosa and 5 logs for S. aureus in vitro.
  • In a mouse sepsis model, implants with phage-activated coatings resulted in a 100% survival rate, compared to 30% and 10% for pathogen-repellent and untreated implants, respectively.
  • Phages, but not bacteria, were detected in the bloodstream of treated mice, indicating systemic control of infection.

Conclusions:

  • Engineered phage-activated, triple-action biomaterials show potential for preventing both local and systemic implant-associated infections.
  • This innovative approach offers a promising strategy to combat the significant challenge of medical implant infections.