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Journal of Biomedical Optics

Laser phototherapy accelerates oral keratinocyte migration through the modulation of the mammalian target of rapamycin signaling pathway
Author(s): Ana Carolina A. Pellicioli; Manoela Domingues Martins; Caroline S. Dillenburg; Márcia M. Marques; Christiane H. Squarize; Rogerio M. Castilho
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Paper Abstract

Keratinocytes play a central role in wound healing by responding to tissue injury through the activation of cellular proliferation and migration. Current clinical evidence suggests that the laser phototherapy (LPT) accelerates wound healing in a variety of oral diseases; however, the molecular mechanisms involved in response to LPT are not fully understood. Oral keratinocytes (NOK-SI) maintained under nutritional-deficit culture medium (2% fetal bovine serum) were irradiated with InGaAlP laser (660 nm; 40 mW; 0.04  cm 2 spot size) in punctual and contact modes. The energy densities used were 4 and 20  J/cm 2 corresponding to 4 and 20 s of exposure times and 0.16 and 0.8 J of energy per point, respectively. Three sessions of irradiations were applied with 6-h intervals. Further, the impact of LPT over cellular migration, proliferation, and activation of the mammalian target of rapamycin (mTOR) pathway, known to play a major role in epithelial migration and wound healing, was analyzed. Compared with control cells, the LPT-treated cells showed accelerated cellular migration without any changes in proliferation. Furthermore, LPT resulted in an increase in the phospho-S6 ribosomal protein, indicating activation of the mTOR signaling pathway. Collectively, these findings suggest that the LPT activates mTOR signaling pathway, promotes epithelial cell migration, and accelerates healing of oral mucosa.

Paper Details

Date Published: 14 February 2014
PDF: 8 pages
J. Biomed. Opt. 19(2) 028002 doi: 10.1117/1.JBO.19.2.028002
Published in: Journal of Biomedical Optics Volume 19, Issue 2
Show Author Affiliations
Ana Carolina A. Pellicioli, Univ. Federal do Rio Grande do Sul (Brazil)
Manoela Domingues Martins, Univ. Federal do Rio Grande do Sul (Brazil)
Caroline S. Dillenburg, Univ. Federal do Rio Grande do Sul (Brazil)
Márcia M. Marques, Univ. de São Paulo (Brazil)
Christiane H. Squarize, Univ. of Michigan (United States)
Rogerio M. Castilho, Univ. of Michigan (United States)

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