E2F1-regulated USP5 contributes to the tumorigenic capacity of glioma stem cells through the maintenance of OCT4
Xiao Jiang1, Hongtao You1, Yixuan Niu1
1Department of Neurosurgery, the Third Affiliated Hospital of Soochow University, Changzhou, 213003, Jiangsu Province, China.
Cancer Letters
|April 21, 2024
Summary
Targeting the E2F1-USP5-OCT4 pathway in mesenchymal glioma stem cells (MES GSCs) offers a new therapeutic strategy for glioblastoma (GBM). This research identifies USP5 as a key regulator of OCT4 stability, crucial for MES GSC stemness and GBM progression.
Area of Science:
- Oncology
- Molecular Biology
- Cancer Stem Cell Research
Background:
- Mesenchymal glioma stem cells (MES GSCs) drive glioblastoma (GBM) aggressiveness and therapy resistance.
- OCT4 is a critical factor maintaining MES GSC stemness and is linked to poor prognosis.
Purpose of the Study:
- To investigate the role of OCT4 and its regulatory mechanisms in MES GSCs.
- To identify novel therapeutic targets for GBM by understanding the molecular drivers of MES GSC function.
Main Methods:
- Analysis of OCT4 expression in MES GSCs and its correlation with prognosis.
- Investigating the interaction between USP5 and OCT4 using biochemical assays.
- Assessing the impact of USP5 depletion on MES GSC self-renewal and tumorigenicity.
- Identifying USP5 transcriptional regulator using dual luciferase reporter gene assays.
Main Results:
- OCT4 is highly expressed in MES GSCs and associated with poor GBM prognosis.
- USP5 deubiquitinates and stabilizes OCT4, preserving MES GSC stemness.
- USP5 is overexpressed in MES GSCs; its depletion reduces OCT4 levels, self-renewal, and tumorigenicity.
- E2F1 was identified as the primary regulator of USP5 transcription.
Conclusions:
- The E2F1-USP5-OCT4 axis is crucial for maintaining MES GSC stemness and driving GBM progression.
- Targeting the E2F1-USP5-OCT4 pathway presents a promising therapeutic strategy for GBM treatment.
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