Metabolic activity of odontoblast-like cells irradiated with blue LED (455 nm)

Autor: Leopoldina Fátima Dantas de Almeida, Josimeri Hebling, Ana Paula Silveira Turrioni, Carlos Alberto de-Souza-Costa, Fernanda Gonçalves Basso
Přispěvatelé: Universidade Estadual Paulista (Unesp)
Rok vydání: 2015
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
ISSN: 1435-604X
0268-8921
DOI: 10.1007/s10103-015-1837-z
Popis: Made available in DSpace on 2018-12-11T17:00:01Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-01-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Blue light emitting diodes (LEDs) are frequently used in dentistry for light activation of resin-based materials; however, their photobiostimulatory effects have not yet been fully investigated. This study aimed to investigate the effect of blue LED (455 nm) on the metabolism of odontoblast-like cells MDPC-23. Energy doses of 2 and 4 J/cm2 were used at 20 mW/cm2 fixed power density. MDPC-23 cells were seeded at 10,000 cells/cm2 density in Dulbecco’s modified Eagle’s medium (DMEM) containing 10 % fetal bovine serum (FBS). After 12 h, the culture medium was replaced with new DMEM supplemented with 0.5 % of FBS, and the cells were incubated for further 12 h. After that, single irradiation was performed to the culture, under selected parameters. Cell viability evaluations (Alamar Blue Assay, n = 12), number of viable cells (Trypan Blue Assay, n = 12), morphological analysis by scanning electron microscopy (SEM, n = 2), gene expression (n = 6) of alkaline phosphatase (Alp), collagen (Col-1a1), and dental matrix protein (Dmp-1) (quantitative polymerase chain reaction (qPCR)) were performed 72 h after irradiation. Data were analyzed by Kruskal-Wallis, ANOVA, and Tukey tests (p < 0.05). Direct light application at 4 J/cm2 energy dose had no negative effects on cell viability, while irradiation with 2 J/cm2 reduced cell metabolism. None of doses affected the number of viable cells compared with the control group. The two energy doses downregulated the expression of Alp; however, expression of Col-1a1 and Dmp-1 had no alteration. Cells presented change in the cytoskeleton only when irradiated with 2 J/cm2. In conclusion, the blue LED (455 nm) irradiation, under the evaluated parameters, had no biostimulatory effects on MDPC-23 cells. Department of Restorative Dentistry Araraquara Dental School “Univ. Estadual Paulista-UNESP” Department of Orthodontics and Pediatric Dentistry Araraquara Dental School “Univ. Estadual Paulista-UNESP”, Rua Humaitá Department of Physiology and Pathology Araraquara Dental School “Univ. Estadual Paulista-UNESP” Department of Restorative Dentistry Araraquara Dental School “Univ. Estadual Paulista-UNESP” Department of Orthodontics and Pediatric Dentistry Araraquara Dental School “Univ. Estadual Paulista-UNESP”, Rua Humaitá Department of Physiology and Pathology Araraquara Dental School “Univ. Estadual Paulista-UNESP” FAPESP: 2012/17552-2
Databáze: OpenAIRE
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