Ultraviolet A irradiation induces senescence in human dermal fibroblasts by down-regulating DNMT1 via ZEB1

Aging
Yuxin YiJi Li

Abstract

In this study, we report the role of DNA methyltransferase 1 (DNMT1) in ultraviolet A (UVA)-induced senescence in human dermal fibroblasts (HDFs). We show that DNMT1 expression was significantly reduced during UVA-induced senescence, and this senescence could be alleviated or aggravated by the up- or down-regulation of DNMT1, respectively. Expression of the transcription factor zinc finger E-box binding homeobox 1(ZEB1) also decreased after UVA irradiation, following a UVA-induced increase of intracellular reactive oxygen species (ROS). We show that ZEB1 binds to the DMNT1 promoter and regulates its transcription, which, in turn, affects cellular senescence. These changes in DMNT1 and ZEB1 expression following UVA exposure were confirmed in matched skin specimens that had or had not been sun-exposed. On analyzing the promoter methylation of 24 senescence associated genes in these matched skin specimens, we discovered that p53 promoter methylation was significantly reduced in sun-exposed skin. In vitro experiments confirmed that UVA irradiation reduced p53 promoter methylation, and DNMT1 up-regulation could reverse this effect. Collectively, down-regulation of ZEB1 caused by UVA induced ROS could transcriptionally inhibit DNMT1,...Continue Reading

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Citations

Apr 3, 2019·Protein & Cell·Xiaojuan HeUNKNOWN Major Program Expert Group
Sep 15, 2020·BioMed Research International·Haiyou WuTie Wu
Dec 7, 2018·Cell Death & Disease·Elisabetta CapriniGiandomenico Russo
Jan 9, 2021·Molecular and Cellular Biochemistry·Lin ChengYun Wang
Jul 29, 2021·The British Journal of Dermatology·H XieJ Li

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Methods Mentioned

BETA
PCR
immunoprecipitation
ChIP
Assay
transfection
biopsy

Software Mentioned

JASPAR
Image J
QUMA methylation
MiSeq Reporter
MethPrimer
BiQ Analyzer

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