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• W2890920841 abstract "UVB wavelengths of light induce the formation of photoproducts in genomic DNA that are potentially mutagenic and detrimental to epidermal cell function. The mineralocorticoid and androgen receptor antagonist spironolactone (SP) was recently identified as an inhibitor of UV photoproduct removal in human cancer cells in vitro via its ability to promote the rapid proteolytic degradation of the DNA repair protein XPB. Using normal human keratinocytes in vitro and skin explants ex vivo, we found that SP rapidly depleted XPB protein in both systems and abrogated two major responses to UVB-induced DNA damage, including the removal of UV photoproducts from genomic DNA and the activation of ATR/ATM DNA damage kinase signaling. These effects were also correlated with both mutagenesis and a predisposition to UVB-induced cell death but were unique to SP, because neither the SP metabolites canrenone and 7α-thiomethylspironolactone nor the more specific mineralocorticoid receptor antagonist eplerenone affected XPB protein levels or the UVB response. Our findings provide an approach for studying XPB and its roles in the UVB DNA damage response in human skin ex vivo and indicate that SP may increase UVB mutagenesis and skin cancer risk in certain individuals. UVB wavelengths of light induce the formation of photoproducts in genomic DNA that are potentially mutagenic and detrimental to epidermal cell function. The mineralocorticoid and androgen receptor antagonist spironolactone (SP) was recently identified as an inhibitor of UV photoproduct removal in human cancer cells in vitro via its ability to promote the rapid proteolytic degradation of the DNA repair protein XPB. Using normal human keratinocytes in vitro and skin explants ex vivo, we found that SP rapidly depleted XPB protein in both systems and abrogated two major responses to UVB-induced DNA damage, including the removal of UV photoproducts from genomic DNA and the activation of ATR/ATM DNA damage kinase signaling. These effects were also correlated with both mutagenesis and a predisposition to UVB-induced cell death but were unique to SP, because neither the SP metabolites canrenone and 7α-thiomethylspironolactone nor the more specific mineralocorticoid receptor antagonist eplerenone affected XPB protein levels or the UVB response. Our findings provide an approach for studying XPB and its roles in the UVB DNA damage response in human skin ex vivo and indicate that SP may increase UVB mutagenesis and skin cancer risk in certain individuals." @default.
• W2890920841 created "2018-09-27" @default.
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• W2890920841 date "2019-02-01" @default.
• W2890920841 modified "2023-09-26" @default.
• W2890920841 title "Spironolactone Depletes the XPB Protein and Inhibits DNA Damage Responses in UVB-Irradiated Human Skin" @default.
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• W2890920841 doi "https://doi.org/10.1016/j.jid.2018.07.039" @default.
• W2890920841 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6342635" @default.
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