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Optimizing Red Light-Based Photodynamic Therapy for Effective Bactericidal Action Against Fusobacterium nucleatum
Jianglan Li1, Takayuki Nambu2, Chao Wang3
1Graduate School of Dentistry (Bacteriology), Osaka Dental University, Hirakata 573-1121, Japan.
Pathogens (Basel, Switzerland)
|November 27, 2024
Summary
Photodynamic therapy using 5-aminolevulinic acid (5-ALA) and red light effectively targets Fusobacterium nucleatum, a key periodontal pathogen. Optimal conditions were identified for bacterial death via porphyrin accumulation, enhancing oral healthcare potential.
Area of Science:
- Microbiology
- Photomedicine
- Periodontology
Background:
- Fusobacterium nucleatum (F. nucleatum) is a critical pathogen in periodontal disease and linked to systemic conditions like colorectal cancer.
- Photodynamic therapy (PDT) with 5-aminolevulinic acid (5-ALA) shows promise for selectively targeting F. nucleatum by inducing porphyrin accumulation.
- The efficacy of red light-based PDT against F. nucleatum subspecies remains largely unevaluated.
Purpose of the Study:
- To investigate the bactericidal effects of 5-ALA mediated photodynamic therapy (ALA-PDT) using red light-emitting diode (LED) light on F. nucleatum subspecies.
- To quantify porphyrin accumulation in response to ALA-PDT.
- To determine optimal conditions for F. nucleatum eradication using ALA-PDT.
Main Methods:
- F. nucleatum subspecies were cultured anaerobically with varying 5-ALA concentrations.
- Porphyrin accumulation was measured using fluorescence spectroscopy.
- Bacterial viability was assessed by colony-forming unit counts post-treatment.
Main Results:
- Red LED light-based ALA-PDT demonstrated bactericidal effects on F. nucleatum subspecies.
- Optimal bacterial killing was observed with 0.01% 5-ALA.
- Uroporphyrin I accumulation significantly correlated with bacterial death, indicating effective treatment.
Conclusions:
- ALA-PDT using red LED light is a viable strategy for targeting F. nucleatum.
- Optimizing 5-ALA concentration and light parameters can enhance therapeutic outcomes in oral healthcare.
- This approach holds potential for managing periodontal disease and related systemic conditions.
