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Real-Time Quantitative Reverse Transcription-Pcr Analysis of Expression Stability of Aggregatibacter Actinomycetemcomitans Fimbria-Associated Gene in Response to Photodynamic Therapy Publisher Pubmed



Pourhajibagher M1 ; Monzavi A2 ; Chiniforush N2 ; Monzavi MM3 ; Sobhani S3 ; Shahabi S2 ; Bahador A1, 2, 4
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Authors Affiliations
  1. 1. Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Laser Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran

Source: Photodiagnosis and Photodynamic Therapy Published:2017


Abstract

Background Aggregatibacter actinomycetemcomitans is an etiological agent of both chronic and aggressive periodontitis. Dissemination of A. actinomycetemcomitans from the oral cavity and initiation of systemic infections has led to new approaches for treatment being needed. In this study, a series of experiments presented investigated the effect of methylene blue (MB)-mediated antimicrobial photodynamic therapy (aPDT) on cell viability and expression of fimbria-associated gene (rcpA) in A. actinomycetemcomitans. Materials and methods To determine the dose-depended effects of aPDT, A. actinomycetemcomitans ATCC 33384 strain photosensitized with MB was irradiated with diode laser following bacterial viability measurements. Cell-surviving assay and expression ratio of rcpA were assessed by colony forming unit and real-time quantitative reverse transcription-PCR (qRT-PCR) assays, respectively. Results In the current study, MB-mediated aPDT using 100 μg/mL showed significant reduction in A. actinomycetemcomitans growth when compared to the control (P < 0.05). Sub-lethal dose of aPDT against A. actinomycetemcomitans was 25 μg/mL MB at fluency of 93.75 J/cm2. Sub-lethal dose of aPDT could lead to about four-fold suppression of expression of rcpA. Conclusion High doses of MB-mediated aPDT could potentially exhibit antimicrobial activity, and the expression of rcpA as an important virulence factor of this strain is reduced in cells surviving aPDT with MB. So, aPDT can be a valuable tool for the treatment of A. actinomycetemcomitans infections. © 2017 Elsevier B.V.
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