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Lookup NU author(s): Wil Reynolds, Dr Ndubuisi Eje, Professor Paul ChristensenORCiD, Professor Mark Birch-MachinORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023 The Authors. FASEB BioAdvances published by The Federation of American Societies for Experimental Biology. The World Health Organization reports that 99% of the global population are exposed to pollution levels higher than the recommended air quality guidelines. Pollution-induced changes in the skin have begun to surface; however, the effects require further investigation so that effective protective strategies can be developed. This study aimed to investigate some of the aging-associated effects caused by ozone and particulate matter (PM) on human skin equivalents. Full-thickness skin equivalents were exposed to 0.01 μg/μL PM, 0.05 μg/μL PM, 0.3 ppm ozone, or a combination of 0.01 μg/μL PM and 0.3 ppm ozone, before skin equivalents and culture medium were harvested for histological/immunohistochemical staining, gene and protein expression analysis using qPCR, Western blotting, and ELISA. Markers include MMP-1, MMP-3, COL1A1, collagen-I, 4-HNE, HMGCR, and PGE2. PM was observed to induce a decrease in epidermal thickness and an enhanced matrix building phenotype, with increases in COL1A1 and an increase in collagen-I protein expression. By contrast, ozone induced an increase in epidermal thickness and was found to induce a matrix-degrading phenotype, with decreases in collagen-I gene/protein expression and increases in MMP-1 and MMP-3 gene/protein expression. Ozone was also found to induce changes in lipid homeostasis and inflammation induction. Some synergistic damage was also observed when combining ozone and 0.01 μg/μL PM. The results presented in this study identify distinct pollutant-induced effects and show how pollutants may act synergistically to augment damage; given individuals are rarely only exposed to one pollutant type, exposure to multiple pollutant types should be considered to develop effective protective interventions.
Author(s): Reynolds WJ, Eje N, Christensen P, Li W-H, Daly SM, Parsa R, Chavan B, Birch-Machin MA
Publication type: Article
Publication status: Published
Journal: FASEB BioAdvances
Year: 2023
Volume: 5
Issue: 11
Pages: 470-483
Print publication date: 05/11/2023
Online publication date: 03/10/2023
Acceptance date: 14/09/2023
Date deposited: 15/09/2023
ISSN (electronic): 2573-9832
Publisher: John Wiley and Sons Inc.
URL: https://doi.org/10.1096/fba.2023-00068
DOI: 10.1096/fba.2023-00068
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