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- W2017013806 abstract "Exposure to ultraviolet radiation exacerbates the skin lesions of autoimmune diseases, and is known to induce cell surface expression of SS-A/Ro antigen on keratinocytes in vitro. Following up on recent reports on ultraviolet-B (UVB)-induced oxidative stress, we examined the role of oxidative stress in the surface expression of SS-A/Ro antigen on human keratinocytes. First, the exclusive induction by UVB irradiation of the 52-kDa protein (Ro52) but not of the 60-kDa protein (Ro60) of SS-A/Ro antigen was demonstrated by means of indirect immunofluorescence. The surface expression of Ro52 induced by UVB irradiation was concentration-dependently inhibited by N-acetyl-l-cysteine, an antioxidant. Furthermore, surface expression of Ro52 was similarly induced by diamide, a chemical oxidant. We next used Hoechst 33342 staining and the TUNEL assay to demonstrate that a low dose (20 mJ/cm2) of UVB did not induce apoptosis but induced the surface expression of Ro52. Moreover, zVAD-fmk, a pan-caspase inhibitor, did not inhibit UVB-induced surface expression of Ro52 even at a high dose (200 mJ/cm2) of UVB, which was sufficient to induce apoptosis in keratinocytes in the absence of zVAD-fmk. Taken together, we concluded that UVB-induced surface expression of Ro52 on keratinocytes is mediated by oxidative stress through a pathway other than apoptosis." @default.
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- W2017013806 date "2002-05-01" @default.
- W2017013806 modified "2023-10-11" @default.
- W2017013806 title "Oxidative stress mediates cell surface expression of SS-A/Ro antigen on keratinocytes" @default.
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- W2017013806 doi "https://doi.org/10.1016/s0891-5849(02)00797-9" @default.
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