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Photodynamic Inactivation of Multidrug-Resistant Staphylococcus aureus Using Hybrid Photosensitizers Based on

Niranga Wijesiri1, Tevhide Ozkaya-Ahmadov1, Peng Wang1

  • 1Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221, United States.

ACS Omega
|July 20, 2018
PubMed

Insights

Novel gold nanoparticle-based photosensitizers offer a potent, antibiotic-free approach to combat multidrug-resistant Staphylococcus aureus (MRSA) infections. These hybrid agents enhance photodynamic inactivation (PDI) efficacy against MRSA, improving treatment outcomes.

Area of Science:

  • Nanotechnology
  • Photochemistry
  • Infectious Diseases

Background:

  • Multidrug-resistant Staphylococcus aureus (MRSA) poses a significant global health threat, causing severe infections in diverse populations.
  • Current treatment limitations necessitate the development of novel therapeutic strategies against MRSA.
  • Photodynamic inactivation (PDI) offers a promising, antibiotic-free modality for combating bacterial infections.

Purpose of the Study:

  • To develop and characterize a novel hybrid photosensitizer for enhanced photodynamic inactivation of MRSA.
  • To evaluate the efficacy of the developed photosensitizer in generating singlet oxygen and inactivating MRSA.
  • To demonstrate an antibiotic-free approach for treating MRSA infections.

Main Methods:

  • Synthesis of amphiphilic block copolymer-functionalized gold nanoparticles.
  • Incorporation of hydrophobic photosensitizing molecules into the nanoparticle structure.
  • Assessment of singlet oxygen generation and photodynamic inactivation efficacy against MRSA under light irradiation.

Main Results:

  • The hybrid photosensitizers demonstrated efficient loading of hydrophobic photosensitizers in aqueous media.
  • Significantly enhanced singlet oxygen generation was observed with the hybrid photosensitizers.
  • Outstanding photodynamic inactivation efficacy against MRSA was achieved under light illumination.

Conclusions:

  • The developed hybrid photosensitizers represent a novel and effective strategy for combating MRSA infections.
  • This antibiotic-free approach significantly enhances the effectiveness of PDI against MRSA.
  • The findings offer a promising new avenue for treating multidrug-resistant bacterial infections.

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