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Abstract Title:

High-power, red-light-emitting diode irradiation enhances proliferation, osteogenic differentiation, and mineralization of human periodontal ligament stem cells via ERK signaling pathway.

Abstract Source:

J Periodontol. 2018 Mar ;89(3):351-360. Epub 2018 Mar 12. PMID: 29528486

Abstract Author(s):

Nobuhiro Yamauchi, Yoichiro Taguchi, Hirohito Kato, Makoto Umeda

Article Affiliation:

Nobuhiro Yamauchi

Abstract:

BACKGROUND: Light-emitting diode (LED) is attracting attention as a new light source for phototherapy. However, its effects on periodontal tissue regeneration remain unknown. The aim of this study was to examine the effects of high-power, red LED irradiation on human periodontal ligament stem cells (PDLSCs), which play an important role in periodontal tissue regeneration.

METHODS: PDLSCs were derived from adult human third molars. The light source was red LED (peak wavelength: 650 nm). Energy densities ranging from 0 to 10 J/cmwere tested to determine the optimal dose. PDLSC proliferation was measured using two parameters: live cell protease and ATP levels. After the cells were induced to differentiate, the effect of LED irradiation on osteogenic differentiation and mineralization was examined, with particular focus on the extracellular signal-regulated kinase (ERK)1/2 signaling pathway using an ERK inhibitor (PD98059).

RESULTS: LED irradiation at 8 J/cmled to a significant increase in PDLSC proliferation and enhanced Runx2 and Osterix mRNA expression, Alkaline phosphatase activity, procollagen type I C-peptide and osteocalcin production, calcium deposition, and alizarin red S staining. In addition, LED induced the activation of ERK1/2, and the effects of LED on PDLSC proliferation, differentiation, and mineralization could be suppressed by treatment with PD98059.

CONCLUSIONS: The results of this study show that 650-nm high-power, red, LED irradiation increases PDLSCs proliferation, and osteogenic differentiation and mineralization, mediated by ERK1/2 activation. These findings suggest that LED may be a useful tool for periodontal tissue regeneration.

Study Type : Human In Vitro

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