LED antimicrobial photodynamic therapy with phenothiazinium dye against Staphylococcus aureus: An in vitro study.

Autor: de Oliveira SCPS; Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador 40110-150, BA, Brazil., Monteiro JSC; Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador 40110-150, BA, Brazil; Department of Biology, Estate University of Feira de Santana, Feira de Santana 44036-900, BA, Brazil., Pires-Santos GM; Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador 40110-150, BA, Brazil., Sampaio FJP; Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador 40110-150, BA, Brazil., Soares AP; Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador 40110-150, BA, Brazil., Soares LGP; Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador 40110-150, BA, Brazil; National Institute Basic Optics and Applied to Life Science, São Carlos 13560-970, SP, Brazil., Pinheiro ALB; Center of Biophotonics, School of Dentistry, Federal University of Bahia, Salvador 40110-150, BA, Brazil; National Institute Basic Optics and Applied to Life Science, São Carlos 13560-970, SP, Brazil; Biomedical Engineering Institute, Universidade Brasil, São Paulo 08230-030, SP, Brazil. Electronic address: albp@ufba.br.
Jazyk: angličtina
Zdroj: Journal of photochemistry and photobiology. B, Biology [J Photochem Photobiol B] 2017 Oct; Vol. 175, pp. 46-50. Date of Electronic Publication: 2017 Aug 24.
DOI: 10.1016/j.jphotobiol.2017.08.029
Abstrakt: The objective of this study was to evaluate, in vitro, the bactericidal effect of AmPDT on Staphylococcus aureus (ATCC 25923) using different concentrations (100, 50, 25, 12.5 and 6.25μg/mL) of phenothiazine compound combined with LED light (λ632±2nm) using varied energy densities (12, 9.6, 7.2, 4.8 and 2.4J/cm 2 ). The experiments were carried out in triplicate and the samples were divided into groups: Control, Irradiated (treated only with light at different energy densities), Photosensitizer (treated only in the presence of the dye), AmPDT (treatment with light associated with dye). Counts of the colony forming units and the data obtained were statistically analyzed (ANOVA, Tukey's test, p<0.05). The results showed no difference between irradiated and Control groups. However, using the photosensitizer alone caused significant increased cytotoxicity and consequent reduction on the CFU counts (12.5μg/mL (p<0.001), 25μg/mL, 50μg/mL and 100μg/mL (p<0.0001). When AmPDT was used significant inhibition above 70% were detected for all concentrations of the photosensitize (p<0.0001) except for 6.25μg/mL. The results indicate a dose-response dependent when the photosensitizer is used alone but not for the sole use of the light is used. It is concluded that, a single application of AmPDT, using energy density of 12J/cm 2 associated either to 12.5 (81.52%) or 25μg/mL (91.57%) resulted in higher in vitro inhibition of S. aureus.
(Copyright © 2017 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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