Antimicrobial photodynamic therapy against metronidazole-resistant dental plaque bactéria

The antimicrobial photodynamic therapy (aPDT) has stood out as an alternative and promising method of disinfection and has been exploited for the treatment of oral bacteria. In this study, we evaluate in vitro the action of aPDT, mediated by methylene blue, chlorin-e6, and curcumin against clinical...

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Published in:Journal of photochemistry and photobiology. B, Biology Biology, 2020-08, Vol.209, p.111903-111903, Article 111903
Main Authors: Zago, Lucas Henrique de Paula, de Annunzio, Sarah Raquel, de Oliveira, Kleber Thiago, Barbugli, Paula Aboud, Valdes, Belen Retamal, Feres, Magda, Fontana, Carla Raquel
Format: Article
Language:English
Subjects:
Antiinfectives and antibacterials
Antimicrobial photodynamic therapy
Biofilms
Cell viability
Chlorin-e6
Curcumin
Dental plaque
Deoxyribonucleic acid
Dilution
Disinfection
DNA
Evaluation
Fluorescence
Fluorescence microscopy
Health services
Internalization
Medical treatment
Methylene blue
Metronidazole
Microorganisms
Periodontal disease
Periodontal diseases
Photodynamic therapy
Resistant sample
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Summary:The antimicrobial photodynamic therapy (aPDT) has stood out as an alternative and promising method of disinfection and has been exploited for the treatment of oral bacteria. In this study, we evaluate in vitro the action of aPDT, mediated by methylene blue, chlorin-e6, and curcumin against clinical subgingival plaques that were resistant to metronidazole. The sensitivity profile of the samples to metronidazole was analyzed by the agar dilution method. Cell viability in the planktonic and biofilm phase was assessed by CFU / mL. The composition of the biofilm was evaluated by the checkboard DNA-DNA Hibrydization technique. Photosensitizers internalization was qualitatively assessed by confocal fluorescence microscopy (CLSM). The aPDT mediated by the three photosensitizers tested was able to reduce the totality of the planktonic microbial load and partially reduce the biofilm samples. The analysis performed by CLSM showed that the photosensitizers used in the application of aPDT were able to permeate the interior of the biofilm. The aPDT has been shown to be useful in a supportive and effective approach to the treatment of periodontal disease. [Display omitted] •aPDT action mediated by curcumin, chlorin-e6 and methylene blue.•Clinical subgingival plaques resistant to metronidazole were reduced by aPDT.•Photosensitizers were able to permeate the biofilm interior.
ISSN:1011-1344
1873-2682
DOI:10.1016/j.jphotobiol.2020.111903