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Supplementary Figure 3 from Sunlight UV-Induced Skin Cancer Relies upon Activation of the p38α Signaling Pathway

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posted on 2023-03-30, 22:10 authored by Kangdong Liu, Donghoon Yu, Yong-Yeon Cho, Ann M. Bode, Weiya Ma, Ke Yao, Shengqing Li, Jixia Li, G. Tim Bowden, Ziming Dong, Zigang Dong

PDF file - 309K, The protein phosphorylation spectrum activated by UVA, UVB or SUV irradiation. N/TERT-1 cells were irradiated with UVA (60 kJ/m2), UVB (3.6 kJ/m2) or SUV (60 kJ UVA/m2/3.6 kJ UVB/m2). Protein extracts (500 μg) were used for phospho-kinase protein array analysis. Array spots were visualized by ECL kit. The density of the each duplicated array spot in Figure 3A was measured as described in Materials and Methods. The table shows the fold change in SUV-induced phosphorylation of all 46 kinases and transcription factors compared to untreated control (i.e., value of 1). Data are shown as an average of duplicate samples.

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ARTICLE ABSTRACT

The activation of cellular signal transduction pathways by solar ultraviolet (SUV) irradiation plays a vital role in skin tumorigenesis. Although many pathways have been studied using pure ultraviolet A (UVA) or ultraviolet B (UVB) irradiation, the signaling pathways induced by SUV (i.e., sunlight) are not understood well enough to permit improvements for prevention, prognosis, and treatment. Here, we report parallel protein kinase array studies aimed at determining the dominant signaling pathway involved in SUV irradiation. Our results indicated that the p38-related signal transduction pathway was dramatically affected by SUV irradiation. SUV (60 kJ UVA/m2/3.6 kJ UVB/m2) irradiation stimulates phosphorylation of p38α (MAPK14) by 5.78-fold, MSK2 (RPS6KA4) by 6.38-fold, and HSP27 (HSPB1) by 34.56-fold compared with untreated controls. By investigating the tumorigenic role of SUV-induced signal transduction in wild-type and p38 dominant-negative (p38 DN) mice, we found that p38 blockade yielded fewer and smaller tumors. These results establish that p38 signaling is critical for SUV-induced skin carcinogenesis. Cancer Res; 73(7); 2181–8. ©2013 AACR.

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