Lasers in Medical Science

, Volume 29, Issue 4, pp 1339–1347

High-frequency low-level diode laser irradiation promotes proliferation and migration of primary cultured human gingival epithelial cells

Original Article

Abstract

In periodontal therapy, the use of low-level diode lasers has recently been considered to improve wound healing of the gingival tissue. However, its effects on human gingival epithelial cells (HGECs) remain unknown. The aim of the present study was to examine whether high-frequency low-level diode laser irradiation stimulates key cell responses in wound healing, proliferation and migration, in primary cultured HGECs in vitro. HGECs were derived from seven independent gingival tissue specimens. Cultured HGECs were exposed to a single session of high-frequency (30 kHz) low-level diode laser irradiation with various irradiation time periods (fluence 5.7–56.7 J/cm2). After 20–24 h, cell proliferation was evaluated by WST-8 assay and [3H]thymidine incorporation assay, and cell migration was monitored by in vitro wound healing assay. Further, phosphorylation of the mitogen-activated protein kinase (MAPK) pathways after irradiation was investigated by Western blotting. The high-frequency low-level irradiation significantly increased cell proliferation and [3H]thymidine incorporation at various irradiation time periods. Migration of the irradiated cells was significantly accelerated compared with the nonirradiated control. Further, the low-level diode laser irradiation induced phosphorylation of MAPK/extracellular signal-regulated protein kinase (ERK) at 5, 15, 60, and 120 min after irradiation. Stress-activated protein kinases/c-Jun N-terminal kinase and p38 MAPK remained un-phosphorylated. The results show that high-frequency low-level diode laser irradiation promotes HGEC proliferation and migration in association with the activation of MAPK/ERK, suggesting that laser irradiation may accelerate gingival wound healing.

Keywords

Cell migration Cell proliferation Lasers LLLT MAPK/ERK Wound healing 

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Copyright information

© Springer-Verlag London 2013

Authors and Affiliations

  1. 1.Department of Periodontology, Graduate School of Medical and Dental SciencesTokyo Medical and Dental UniversityTokyoJapan
  2. 2.Department of BiochemistryNihon University School of DentistryTokyoJapan
  3. 3.Department of BiochemistryOhu University School of Pharmaceutical SciencesKoriyamaJapan
  4. 4.Global Center of Excellence (GCOE) Program, International Research Center for Molecular Science in Tooth and Bone DiseasesTokyo Medical and Dental UniversityTokyoJapan

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