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Inhibition of UVB-Induced Inflammation by Laminaria japonica Extract via Regulation of nc886-PKR Pathway

1
Life Science Institute, BioSpectrum, Yongin 16827, Gyeonggi, Korea
2
Clariant Active Ingredients, d’espagne, 31000 Toulouse, France
*
Author to whom correspondence should be addressed.
Nutrients 2020, 12(7), 1958; https://doi.org/10.3390/nu12071958
Received: 25 May 2020 / Revised: 26 June 2020 / Accepted: 27 June 2020 / Published: 30 June 2020
(This article belongs to the Section Phytochemicals and Human Health)
Continuous exposure to ultraviolet B (UVB) can cause photodamage of the skin. This photodamage can be inhibited by the overexpression of the non-coding RNA, nc886, via the protein kinase RNA-activated (PKR) pathway. The study aims to identify how UVB inhibits nc886 expression, and it also seeks to determine whether substances that can control nc886 expression can influence UV-induced inflammation, and the mechanisms involved. The results suggest that UVB irradiation accelerates the methylation of the nc886 gene, therefore, reducing its expression. This induces the activation of the PKR, which accelerates the expression of metalloproteinase-9 (MMP-9) and cyclooxygenase (COX-2), and the production of MMP-9, prostaglandin-endoperoxide synthase (PGE2), and certain pro-inflammatory cytokines, specifically interleukin-8 (IL-8), and tumor necrosis factor-α (TNF-α). Conversely, in a model of nc886 overexpression, the expression and production of those inflammatory factors are inhibited. In addition, Laminaria japonica extract (LJE) protect the levels of nc886 against UVB irradiation then subsequently inhibit the production of UV-induced inflammatory factors through the PKR pathway. View Full-Text
Keywords: UVB radiation; nc886-PKR pathway; Laminaria japonica; inflammation UVB radiation; nc886-PKR pathway; Laminaria japonica; inflammation
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Lee, K.-S.; Cho, E.; Weon, J.B.; Park, D.; Fréchet, M.; Chajra, H.; Jung, E. Inhibition of UVB-Induced Inflammation by Laminaria japonica Extract via Regulation of nc886-PKR Pathway. Nutrients 2020, 12, 1958.

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