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GSH depletion and consequent AKT inhibition contribute to the Nrf2 knockdown-induced decrease in proliferation in
Yue Jia1, Han-Dong Wang1, Qiang Wang1
1Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu 210002, P.R. China.
Oncology Reports
|March 6, 2017
Summary
Nuclear factor erythroid 2-related factor 2 (Nrf2) drives glioma cell proliferation and redox balance. Nrf2 deficiency impairs growth and redox homeostasis, highlighting its proto-oncogene role in glioblastoma.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Nuclear factor erythroid 2-related factor 2 (Nrf2) is a transcription factor regulating antioxidant and cytoprotective genes.
- Nrf2 has been identified as a proto-oncogene, but its specific role in glioma pathogenesis is not fully understood.
Purpose of the Study:
- To investigate the expression and function of Nrf2 in glioblastoma (GBM) cells.
- To elucidate the underlying mechanisms by which Nrf2 influences GBM cell proliferation and redox status.
Main Methods:
- Nrf2 expression was analyzed in normal astrocytes and human GBM cell lines (U251, U87, A172).
- Nrf2 was specifically knocked down in U251 cells using lentivirus-mediated RNA interference.
- The effects of Nrf2 knockdown on cell proliferation, intracellular redox balance (GSH and ROS levels), and signaling pathways (AKT and ERK1/2) were assessed.
- Supplementation with N-acetylcysteine and glutathione monoethyl ester (GMEE) was used to evaluate their impact on ROS levels, cell growth, and GSH restoration.
- The role of AKT signaling was further investigated using an AKT-specific inhibitor.
Main Results:
- All tested GBM cell lines overexpressed Nrf2, with the highest levels in U251 cells.
- Nrf2 knockdown in U251 cells reduced cell proliferation and disrupted intracellular redox balance, decreasing glutathione (GSH) and increasing reactive oxygen species (ROS).
- GMEE supplementation restored GSH levels and reversed Nrf2 deficiency-induced cell growth arrest, while also normalizing ROS levels.
- Nrf2 knockdown impaired both AKT and ERK1/2 signaling; GMEE restored AKT signaling, but not ERK1/2.
- Inhibition of AKT signaling diminished the proliferative effects of GMEE in Nrf2-deficient cells.
Conclusions:
- Nrf2 plays a crucial role in regulating redox status and promoting cell proliferation in glioblastoma.
- Intracellular GSH levels and AKT signaling are essential components of Nrf2's function in glioma tumorigenesis.
- These findings offer a new perspective on Nrf2's mechanism in cancer development and suggest potential therapeutic targets.