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Background <p>Skin is exposed to various environmental factors throughout life, and some of these factors are known to contribute to skin aging. Long-term solar UV exposure is a well-known cause of skin aging, as is cigarette smoke, which contains a number of chemicals. In this study, combined effect of UVA and cigarette sidestream smoke (CSS) on matrix metalloproteinase-1 (MMP-1) induction was investigated. MMP-1 is the main protease that initiates collagen type I fiber fragmentation in human skin and is associated with aging.</p> Results <p>Combined exposure to UVA and CSS enhanced MMP-1 induction, accompanied by collagen type I (<i>COL1A1</i>) gene suppression. The basal expression of MMP-1 was higher in senescent cells than in normal cells, with a pronounced increase after coexposure to UVA and CSS. UVA irradiation resulted in global histone H3 acetylation, and we considered this was responsible for the MMP-1 upregulation. Histone deacetylase inhibitors, sodium acetate, propionate, and butyrate, all enhanced the CSS-induced MMP-1 according to the degree of histone acetylation.</p> Conclusion <p>These results suggest that UVA and CSS additively induce MMP-1, which may lead to skin aging, and that such combined effect may further promote aging in aged skin. UVA-induced histone acetylation may contribute to MMP-1 induction.</p>

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Increased matrix metalloproteinase-1 expression by coexposure to UVA and cigarette sidestream smoke and contribution of histone acetylation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月26日

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  • Ryoma Ito,
  • Yukako Komaki,
  • Yuko Ibuki

摘要

Background

Skin is exposed to various environmental factors throughout life, and some of these factors are known to contribute to skin aging. Long-term solar UV exposure is a well-known cause of skin aging, as is cigarette smoke, which contains a number of chemicals. In this study, combined effect of UVA and cigarette sidestream smoke (CSS) on matrix metalloproteinase-1 (MMP-1) induction was investigated. MMP-1 is the main protease that initiates collagen type I fiber fragmentation in human skin and is associated with aging.

Results

Combined exposure to UVA and CSS enhanced MMP-1 induction, accompanied by collagen type I (COL1A1) gene suppression. The basal expression of MMP-1 was higher in senescent cells than in normal cells, with a pronounced increase after coexposure to UVA and CSS. UVA irradiation resulted in global histone H3 acetylation, and we considered this was responsible for the MMP-1 upregulation. Histone deacetylase inhibitors, sodium acetate, propionate, and butyrate, all enhanced the CSS-induced MMP-1 according to the degree of histone acetylation.

Conclusion

These results suggest that UVA and CSS additively induce MMP-1, which may lead to skin aging, and that such combined effect may further promote aging in aged skin. UVA-induced histone acetylation may contribute to MMP-1 induction.