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Related Experiment Videos

Targeted antimicrobial photochemotherapy

N S Soukos1, L A Ximenez-Fyvie, M R Hamblin

  • 1Wellman Laboratories of Photomedicine, Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts 02114-2698, USA.

Antimicrobial Agents and Chemotherapy
|October 3, 1998
PubMed
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New antimicrobial therapy uses targeted poly-L-lysine (pL)-chlorin e6 (ce6) conjugates activated by red light. This approach shows selective photodestruction of oral bacteria, offering potential for periodontal disease treatment.

Area of Science:

  • Biomedical Engineering
  • Photodynamic Therapy
  • Antimicrobial Research

Background:

  • Periodontal disease involves complex oral microbiota, including gram-positive and gram-negative bacteria.
  • Current antimicrobial strategies face challenges with resistance and off-target effects.
  • Photodynamic therapy (PDT) offers a light-activated antimicrobial approach with potential for targeted action.

Purpose of the Study:

  • To evaluate the efficacy of poly-L-lysine (pL)-chlorin e6 (ce6) conjugates for targeted antimicrobial photodynamic therapy.
  • To determine if pL-ce6 conjugates selectively target oral bacteria (Actinomyces viscosus, Porphyromonas gingivalis) over oral epithelial cells (HCPC-1).
  • To investigate the role of conjugate charge in bacterial targeting and phototoxicity.

Main Methods:

Related Experiment Videos

  • Preparation of cationic, neutral, and anionic ce6-pL conjugates with an average molecular weight of 2,000.
  • Incubation of bacterial and epithelial cell cultures with conjugates followed by red light (671 nm) irradiation.
  • Assessment of bacterial killing (CFU reduction) and epithelial cell viability.
  • Comparison with a monocationic ce6 derivative and a clinical photosensitizer (benzoporphyrin derivative).

Main Results:

  • Cationic pL-ce6 conjugates demonstrated significant dose-dependent bacterial killing (>99% for P. gingivalis, >99.99% for A. viscosus) with minimal impact on epithelial cells.
  • Bacterial uptake of cationic conjugates was 20- to 100-fold higher than mammalian cells.
  • The cationic charge was crucial for efficacy, outperforming neutral and anionic conjugates, as well as free ce6.
  • A clinical photosensitizer showed toxicity to epithelial cells while sparing bacteria.

Conclusions:

  • Cationic pL-ce6 conjugates exhibit selective uptake and potent photodynamic antimicrobial activity against key oral pathogens.
  • This targeted approach spares host epithelial cells, suggesting a favorable safety profile.
  • Cationic pL-ce6 conjugates represent a promising therapeutic candidate for photodynamic therapy of periodontal disease.