1. P68 RNA helicase promotes invasion of glioma cells through negatively regulating DUSP5.
- Author
-
Wang R, Bao HB, Du WZ, Chen XF, Liu HL, Han DY, Wang LG, Wu JN, Wang CL, Yang MC, Liu ZW, Zhang N, and Teng L
- Subjects
- Brain Neoplasms metabolism, Brain Neoplasms pathology, Cell Line, Tumor, Cell Movement genetics, Cell Proliferation genetics, DEAD-box RNA Helicases metabolism, Dual-Specificity Phosphatases metabolism, Extracellular Signal-Regulated MAP Kinases metabolism, Glioma metabolism, Glioma pathology, Humans, MAP Kinase Signaling System genetics, Neoplasm Invasiveness, Phosphorylation, RNA Interference, Brain Neoplasms genetics, DEAD-box RNA Helicases genetics, Dual-Specificity Phosphatases genetics, Gene Expression Profiling, Gene Expression Regulation, Neoplastic, Glioma genetics
- Abstract
Gliomas are the most common central nervous system tumors. They show malignant characteristics indicating rapid proliferation and a high invasive capacity and are associated with a poor prognosis. In our previous study, p68 was overexpressed in glioma cells and correlated with both the degree of glioma differentiation and poor overall survival. Downregulating p68 significantly suppressed proliferation in glioma cells. Moreover, we found that the p68 gene promoted glioma cell growth by activating the nuclear factor-κB signaling pathway by a downstream molecular mechanism that remains incompletely understood. In this study, we found that dual specificity phosphatase 5 (DUSP5) is a downstream target of p68, using microarray analysis, and that p68 negatively regulates DUSP5. Upregulating DUSP5 in stably expressing cell lines (U87 and LN-229) suppressed proliferation, invasion, and migration in glioma cells in vitro, consistent with the downregulation of p68. Furthermore, upregulating DUSP5 inhibited ERK phosphorylation, whereas downregulating DUSP5 rescued the level of ERK phosphorylation, indicating that DUSP5 might negatively regulate ERK signaling. Additionally, we show that DUSP5 levels were lower in high-grade glioma than in low-grade glioma. These results suggest that the p68-induced negative regulation of DUSP5 promoted invasion by glioma cells and mediated the activation of the ERK signaling pathway., (© 2018 The Authors. Cancer Science published by John Wiley & Sons Australia, Ltd on behalf of Japanese Cancer Association.)
- Published
- 2019
- Full Text
- View/download PDF