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• W2024873389 startingPage "545" @default.
• W2024873389 abstract "Exposure of human keratinocytes to ultraviolet A (UVA) radiation at physiological doses leads to a biphasic activation of transcription factor activator protein-2 (AP-2) and subsequently to a biphasic increase in gene expression of, e.g. intercellular adhesion molecule-1 (ICAM-1). Both kinetics follow a pattern with a first peak between 0.5 and 2 h and a second, more sustained activation between 16 and 48 h. We have previously reported on a non-enzymatic triggering of the ceramide signaling cascade as the initiating step in UVA radiation-induced signaling. In this study, we report that this early (0.5-1 h) peak in ceramide content is followed by a second peak that (i) was associated with an increased expression and activity of serine palmitoyltransferase, the key enzyme of ceramide synthesis, (ii) could be prevented by inhibitors of this enzyme, and (iii) was of functional relevance because its inhibition abrogated the second, but not the first peak in UVA radiation-induced ICAM-1 gene expression. We hypothesize that this second peak most likely resulted from a ceramide-mediated autocrine loop, for (i) inhibition of the first ceramide peak resulted in inhibition of the second peak and (ii) cell-permeable ceramides-induced serine palmitoyltransferase expression, activity, and subsequently ceramide content." @default.
• W2024873389 created "2016-06-24" @default.
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• W2024873389 date "2005-09-01" @default.
• W2024873389 modified "2023-10-17" @default.
• W2024873389 title "Ultraviolet A-Induced Signaling Involves a Ceramide-Mediated Autocrine Loop Leading to Ceramide De Novo Synthesis" @default.
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• W2024873389 doi "https://doi.org/10.1111/j.0022-202x.2005.23782.x" @default.
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• W2024873389 hasPublicationYear "2005" @default.
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