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The Impact of Aggregatibacter Actinomycetemcomitans Biofilm-Derived Effectors Following Antimicrobial Photodynamic Therapy on Cytokine Production in Human Gingival Fibroblasts Publisher Pubmed



Peeridogaheh H1 ; Pourhajibagher M2 ; Barikani HR3 ; Bahador A4
Authors
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Authors Affiliations
  1. 1. Department of Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran
  2. 2. Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Dental Implant Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Oral Microbiology Laboratory, Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran

Source: Photodiagnosis and Photodynamic Therapy Published:2019


Abstract

Background: Antimicrobial photodynamic therapy (aPDT)is an effective adjunctive therapeutic modality for the treatment of local infections, including periodontitis and peri-implantitis. After receiving aPDT, microbial cells in the biofilm structure may produce and/ or release soluble biofilm-derived effectors (BDEs), which may affect the biology of the host cells in the community context of their surrounding microenvironment. Given the fact that no study has investigated the role of BDEs following aPDT in the pathogenesis of infectious diseases, the aim of the current study was to determine the effect of BDEs of Aggregatibacter actinomycetemcomitans following exposure to sub-lethal doses of indocyanine green (ICG)-aPDT on human gingival fibroblasts (HGFs)in terms of cytokines produced. Materials and methods: In this study, we evaluated the effect of biofilm-conditioned medium (BCM)resulting from the treatment of A. actinomycetemcomitans biofilm with a sub-lethal dose of aPDT on cytokines production, including IL-6, IL-8, CXCL10, TGF-β, and bFGF of HGFs using enzyme-linked immunoassays (ELISA). The sensitivity of cytokines to BDEs was determined by micro-titer plates. Results: The maximal sub-lethal dose of ICG-PDT was 20.15 μM/mL ICG at a fluence of 31.2 J/cm2. The BCM of ICG-PDT-treated viable A. actinomycetemcomitans significantly reduced IL-6, IL-8, and CXCL10 levels compared to the BCM of untreated viable A. actinomycetemcomitans (78-, 93-, and 61.6-fold reduction, respectively; all P < 0.01). TGF-β and bFGF were strongly induced by BCM of ICG-PDT treated viable A. actinomycetemcomitans (by 57.7 and 36.1 folds, respectively; both P < 0.05). The BCM of untreated viable A. actinomycetemcomitans degraded most of the CxCL10, TGF-β and bFGF (58.8, 61.5, and 71.6%, respectively)in 24 h, while it degraded 9.3% of IL-6 and 15.1% of IL-8 after 24 h. Conclusion: The results of the current study revealed that a sub-lethal dose of ICG-aPDT through the effect of BCM on HGFs could not only significantly reduce the production of pro-inflammatory cytokines but also promoted their role in periodontal regeneration due to increasing the bFGF level. Altogether, ICG-aPDT, with it's antimicrobial effects reduces inflammation and induces of tissue regeneration resulting from BCM, can be considered an efficient adjunctive therapeutic method for the treatment of local infections. © 2019 Elsevier B.V.
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