Continuous irradiation with a 633-nm light-emitting diode exerts an anti-aging effect on human skin cells

Kim,Hak  Sun; Park,Won  Sang; Baek,Jong-In; Lee,Bo-Sub; Yoo,Dae  Sung; Park,Si  Jun

doi:10.3892/ijmm.2014.2030

Continuous irradiation with a 633-nm light-emitting diode exerts an anti-aging effect on human skin cells

Authors:
- Hak Sun Kim
- Won Sang Park
- Jong-In Baek
- Bo-Sub Lee
- Dae Sung Yoo
- Si Jun Park
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Affiliations: Samsung Display Co., Ltd., Yongin, Gyeonggi-do 446-811, Republic of Korea, R&D Center, ACT Co., Ltd., Suwon, Gyeonggi-do 443-734, Republic of Korea
Published online on: December 9, 2014 https://doi.org/10.3892/ijmm.2014.2030
Pages: 383-390

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Abstract

Accumulating evidence has indicated that the light source emitted from light‑emitting diode (LED) has a potential anti-aging effect on human skin. Studies using single and interval LED irradiation have documented such effects; however, to the best of our knowledge, the anti-aging effects of continuous LED irradiation have not yet been investigated. In the present study, we demonstrated that continuous irradiation with a 633±3-nm LED exerted anti-aging effects in both in vitro and ex vivo experiments. More specifically, irradiation with a 633-nm LED for 2 days increased the synthesis of type 1 procollagen and decreased the expression of matrix metalloproteinase (MMP)1 and MMP2 in skin fibroblasts. In addition, irradiation with a 633-nm LED decreased the expression levels of inflammatory genes, such has cyclooxygenase-2 (COX-2), and interleukin-1-α (IL-1α) in keratinocytes. Furthermore, a 14-day LED irradiation moderately increased keratinocyte proliferation. Using human skin explants, we confirmed the safety of this 633-nm LED irradiation, which resulted in unaltered morphology and allergy-free potential in human tissue. Overall, these data provide insight into the anti-aging effects of continuous LED irradiation on human skin.

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