CYP11A1-derived vitamin D3 products protect against UVB-induced inflammation and promote keratinocytes differentiation.

Abstract

UVB radiation mediates inflammatory responses causing skin damage and defects in epidermal differentiation. 1α,25-Dihydroxyvitamin D3 (1,25(OH)2D3) interacts with the vitamin D3 receptor (VDR) to regulate inflammatory responses. Additionally, 1,25(OH)2D3/VDR signaling represents a potential therapeutic target in the treatment of skin disorders associated with inflammation and poor differentiation of keratinocytes. Since the protective effect of 1,25(OH)2D3 against UVB-induced skin damage and inflammation is recognized, CYP11A1-derived vitamin D3-hydroxyderivatives including 20(OH)D3, 1,20(OH)2D3, 20,23(OH)2D3 and 1,20,23(OH)3D3 were tested for their anti-inflammatory and skin protection properties in UVB-irradiated human epidermal keratinocytes (HEKn). HEKn were treated with secosteroids for 24 h pre- and post-UVB (50 mJ/cm2) irradiation. Secosteroids modulated the expression of the inflammatory response genes (IL-17, NF-κB p65, and IκB-α), reducing nuclear-NF-κB-p65 activity and increasing cytosolic-IκB-α expression as well as that of pro-inflammatory mediators, IL-17, TNF-α, and IFN-γ. They stimulated the expression of involucrin (IVL) and cytokeratin 10 (CK10), the major markers of epidermal differentiation, in UVB-irradiated cells. We conclude that CYP11A1-derived hydroxyderivatives inhibit UVB-induced epidermal inflammatory responses through activation of IκB-α expression and suppression of NF-kB-p65 activity and its downstream signaling cytokines, TNF-α, and IFN-γ, as well as by inhibiting IL-17 production and activating epidermal differentiation.

• Authors: Anyamanee Chaiprasongsuk, Zorica Janjetovic, Tae-Kang Kim, Robert C Tuckey, Wei Li, Chander Raman, Uraiwan Panich, Andrzej T Slominski
• Journal: Free radical biology & medicine (Free Radic Biol Med) Vol. 155 Pg. 87-98 (08 01 2020) ISSN: 1873-4596 [Electronic] United States
• PMID: 32447000 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)
• Copyright: Published by Elsevier Inc.

Chemical References

• Vitamin D
• Cholecalciferol
• Cholesterol Side-Chain Cleavage Enzyme

Topics

• Cell Differentiation
• Cells, Cultured
• Cholecalciferol
• Cholesterol Side-Chain Cleavage Enzyme
• Humans
• Inflammation
• Keratinocytes
• Vitamin D