Effect of low‑level laser intervention on dermatitis symptoms and cytokine changes in DNCB‑induced atopy mouse model: A randomized controlled trial

Kim,You Lim; Lim,Hee Sung; Lee,Suk Min

doi:10.3892/etm.2021.10630

Effect of low‑level laser intervention on dermatitis symptoms and cytokine changes in DNCB‑induced atopy mouse model: A randomized controlled trial

Authors:
- You Lim Kim
- Hee Sung Lim
- Suk Min Lee
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Affiliations: Division of Healthcare Technology Assessment Research, National Evidence‑based Healthcare Collaborating Agency, Seoul 04554, Republic of Korea, Department of Physical Education, College of Sport of Science, Korea National Sport University, Seoul 05541, Republic of Korea, Department of Physical Therapy, Sahmyook University, Seoul 01795, Republic of Korea
Published online on: August 20, 2021 https://doi.org/10.3892/etm.2021.10630
Article Number: 1196
Copyright: © Kim et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The incidence of atopic dermatitis (AD) has recently increased due to various factors. Its prevalence is higher among children and teenagers than in other age groups. Numerous methods to treat AD are available, including light ray therapy, which has been proposed as an alternative therapy for the treatment of AD. The present study aimed to evaluate the curative mechanism and optimal energy level of energy irradiation from a low‑level laser (LLL) toward AD. AD was induced in BALB/c mice with dinitrochlorobenzene (DNCB) solution. The mice were divided into six groups, including one normal control (n=8), one AD control (n=10) and four AD experimental groups with LLL irradiation at 2 J/cm² (n=10), 4 J/cm² (n=10), 6 J/cm² (n=9) and 8 J/cm² (n=10). Following AD induction, an LLL was applied to the four AD experimental groups for 2, 4, 6, and 8 min, for two weeks (14 times in total) at a wavelength of 650 nm and an output of 50 mW. The effects of irradiation on AD were evaluated using a scratch test, a clinical skin severity test, immunoglobulin‑E (IgE) analysis and measurements of numerous cytokine levels, including interleukin (IL)‑4, IL‑6, tumor necrosis factor (TNF)‑α, and interferon‑γ (IFN‑γ), tissue thickness and mast cell count. The results demonstrated that serum IgE level in all irradiated groups was significantly decreased compared with that of the AD control group, and IL‑4 level was significantly decreased in all irradiated groups apart from the 8 J/cm² LLL irradiated group. IL‑6 and TNF‑α levels were also significantly decreased in all irradiated groups. The results from histological analysis revealed diminished epidermal thickness and mast cell counts in irradiated mice compared with those mice in the AD control group. In summary, these findings suggested that LLL irradiation may alleviate symptoms of AD and may be useful for restoring cytokines levels and tissues features to normal levels.

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