Volume 54, Issue 4 pp. 600-610
BASIC SCIENCE

Improved healing and macrophage polarization in oral ulcers treated with photobiomodulation (PBM)

Hyun Seok Ryu MS

Hyun Seok Ryu MS

Interdisciplinary Program for Medical Laser, College of Medicine, Dankook University, Cheonan, Republic of Korea

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Nam Kyu Lim MD, MS

Nam Kyu Lim MD, MS

Department of Plastic and Reconstructive Surgery, Dankook University College of Medicine, Cheonan, Republic of Korea

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Andrew Reyes Padalhin PhD

Andrew Reyes Padalhin PhD

Beckman Laser Institute Korea, Dankook University College of Medicine, Cheonan, Republic of Korea

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Celine Abueva PhD

Celine Abueva PhD

Beckman Laser Institute Korea, Dankook University College of Medicine, Cheonan, Republic of Korea

Medical Laser Research Center, Dankook University, Cheonan, Republic of Korea

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So Young Park MS

So Young Park MS

Beckman Laser Institute Korea, Dankook University College of Medicine, Cheonan, Republic of Korea

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Phil-sang Chung MD, PhD

Phil-sang Chung MD, PhD

Beckman Laser Institute Korea, Dankook University College of Medicine, Cheonan, Republic of Korea

Medical Laser Research Center, Dankook University, Cheonan, Republic of Korea

Department of Otorhinolaryngology-Head and Neck Surgery, Dankook University College of Medicine, Cheonan, Republic of Korea

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Seung Hoon Woo MD, PhD

Corresponding Author

Seung Hoon Woo MD, PhD

Beckman Laser Institute Korea, Dankook University College of Medicine, Cheonan, Republic of Korea

Medical Laser Research Center, Dankook University, Cheonan, Republic of Korea

Department of Otorhinolaryngology-Head and Neck Surgery, Dankook University College of Medicine, Cheonan, Republic of Korea

CorrespondenceSeung Hoon Woo, MD, PhD, Department of Otorhinolaryngology-Head and Neck Surgery, Dankook University College of Medicine, 201 Manghyang-ro, Dongnam-gu, Cheonan 31116, Republic of Korea.

Email: [email protected]

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First published: 16 December 2021
Citations: 5

Hyun Seok Ryu and Nam Kyu Lim are co-first authors and contributed equally to this study.

Abstract

Objectives

The effect of photobiomodulation (PBM) treatment on wound healing and macrophage polarization was investigated in vivo. Animal models of oral ulcers were simulated through chemically induced oral ulcers in rats.

Materials and Methods

PBM treatment using an infrared pulsed laser was used to treat oral ulcers in the animal models. Twelve Sprague–Dawley rats were randomly divided into four groups depending on set absorbed energy: Group 1 (control), Group 2 (30 J), Group 3 (60 J), and Group 4 (100 J). Laser treatment was performed every other day for 8 days after ulcer confirmation. Parameters used were as follows: wavelength 808 nm, power output 50 mW, spot size 10 mm, frequency 10 Hz, and pulse duration 1 millisecond. Ulcers were measured to determine the effect of the treatments over time. Histology, immunostaining, and real-time polymerase chain reaction analyses were performed to evaluate the effect of PBM treatment on macrophage-related (IL-6/IL-10) and wound-healing-related (TNF-α/TGF-β/MMP-2) cytokine expression.

Results

Histological examinations indicate that the PBM treatment stimulated a higher level of wound recovery after 8 days of treatment at 60 J absorbed energy compared to other treatment groups. Analyses of relative gene expression of proinflammatory, anti-inflammatory, and tissue remodeling cytokines indicate that the macrophages in the tissue samples were predominantly characterized as M2 subtypes (alternatively activated), which possibly accounts for the accelerated tissue repair in the animal model of oral ulcer.

Conclusion

This preliminary study stands as a proof of concept regarding the potential use of infrared laser PBM treatment for oral ulcers which have not been previously investigated upon. PBM treatment affects macrophage polarization and enhances wound healing. Further experimentation will be conducted to expand the understanding of how PBM treatment affects the healing mechanism of ulcers.

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