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• W2158442888 abstract "Abstract Arsenite is a well-known human carcinogen that especially targets skin. The tumor progression locus 2 (Tpl2) gene encodes a serine/threonine protein kinase that is overexpressed in various cancer cells. However, the relevance of Tpl2 in arsenite-induced carcinogenesis and the underlying mechanisms remain to be explored. We show that arsenite increased Tpl2 kinase activity and its phosphorylation in mouse epidermal JB6 P+ cells in a dose- and time-dependent manner. Exposure to arsenite resulted in a marked induction of cyclooxygenase-2 (COX-2) and prostaglandin E2 (PGE2), important mediators of inflammation and tumor promotion. Treatment with a Tpl2 kinase inhibitor or Tpl2 short hairpin RNA suppressed COX-2 expression and PGE2 production induced by arsenite treatment, suggesting that Tpl2 is critical in arsenite-induced carcinogenesis. We also found that arsenite-induced phosphorylation of extracellular signal-regulated kinases (ERK) or c-Jun NH2-terminal kinases (JNK) was markedly suppressed by Tpl2 kinase inhibitor or Tpl2 short hairpin RNA. Inhibition of arsenite-induced ERK or JNK signaling using a pharmacologic inhibitor of ERK or JNK substantially blocked COX-2 expression. Furthermore, inhibition of Tpl2 reduced the arsenite-induced promoter activity of NF-κB and activator protein-1 (AP-1), indicating that NF-κB and AP-1 are downstream transducers of arsenite-triggered Tpl2. Our results show that Tpl2 plays a key role in arsenite-induced COX-2 expression and PGE2 production and further elucidate the role of Tpl2 in arsenite signals that activate ERK/JNK and NF-κB/AP-1 in JB6 P+ cells. [Cancer Res 2009;69(20):8043–9]" @default.
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• W2158442888 date "2009-10-14" @default.
• W2158442888 modified "2023-09-23" @default.
• W2158442888 title "Tpl2 Is a Key Mediator of Arsenite-Induced Signal Transduction" @default.
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• W2158442888 doi "https://doi.org/10.1158/0008-5472.can-09-2316" @default.
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