Abstract
The aim of the present study was to evaluate the effects of photobiomodulation (PBM) on cytokine levels and angiogenesis during oral wound healing. Ulcers were made on the dorsum of the tongue in 48 Wistar rats. Irradiation with an indium-gallium-aluminum-phosphide (InGaAlP) laser (660 nm; output power, 40 mW; spot size, 0.04 cm2) was performed once a day on two points of the ulcer for 14 days. Two different energy densities were used: 4 J/cm2 (energy per point 0.16 J, total energy 0.32 J) and 20 J/cm2 (energy per point 0.8 J, total energy 1.6 J). Tissue levels of interleukin (IL)-1β and tumor necrosis factor (TNF)-α were investigated by enzyme-linked immunosorbent assay (ELISA). Image analysis of CD31-immunostained sections was used to investigate microvessel density (MVD). PBM increased the tissue levels of IL-1β at the early stage of oral wound healing (p < 0.01) and increased the tissue levels of TNF-α during all stages of oral wound healing (p < 0.05). PBM at a dose of 4 J/cm2 produced more significant results regarding cytokine modulation and was associated with higher MVD at day 5. Collectively, these findings indicate that cytokine modulation and increased angiogenesis are among the basic mechanisms whereby PBM improves oral wound repair.
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Acknowledgments
The authors are grateful to Flavia Rejane Giusti for technical support.
Funding support
This study was supported by the Postgraduate Research Group, Hospital de Clínicas de Porto Alegre (GPPG/FIPE: 12-0338). Luise Meurer and Manoela Domingues Martins are research fellows funded by the Brazilian National Council for Scientific and Technological Development (CNPq).
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All experiments were carried out in accordance with the US National Academy of Sciences Guide for the Care and Use of Laboratory Animals and approved by the Institutional Animal Care and Use Committee of Hospital de Clínicas de Porto Alegre, Brazil, under process number 12-0338.
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Wagner, V.P., Curra, M., Webber, L.P. et al. Photobiomodulation regulates cytokine release and new blood vessel formation during oral wound healing in rats. Lasers Med Sci 31, 665–671 (2016). https://doi.org/10.1007/s10103-016-1904-0
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DOI: https://doi.org/10.1007/s10103-016-1904-0