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Protein Phosphatases-A Touchy Enemy in the Battle Against Glioblastomas: A Review
Arata Tomiyama1,2, Tatsuya Kobayashi3,4,5, Kentaro Mori6
1Division of Brain Tumor Translational Research, National Cancer Center Research Institute, 5-1-1 Tsukiji, Chuo-ku, Tokyo 104-0045, Japan. atomiyam@outlook.jp.
Abstract:
Glioblastoma (GBM) is the most common malignant tumor arising from brain parenchyma. Although many efforts have been made to develop therapies for GBM, the prognosis still remains poor, mainly because of the difficulty in total resection of the tumor mass from brain tissue and the resistance of the residual tumor against standard chemoradiotherapy. Therefore, novel adjuvant therapies are urgently needed. Recent genome-wide analyses of GBM cases have clarified molecular signaling mechanisms underlying GBM biology. However, results of clinical trials targeting phosphorylation-mediated signaling have been unsatisfactory to date. Protein phosphatases are enzymes that antagonize phosphorylation signaling by dephosphorylating phosphorylated signaling molecules. Recently, the critical roles of phosphatases in the regulation of oncogenic signaling in malignant tumor cells have been reported, and tumorigenic roles of deregulated phosphatases have been demonstrated in GBM. However, a detailed mechanism underlying phosphatase-mediated signaling transduction in the regulation of GBM has not been elucidated, and such information is necessary to apply phosphatases as a therapeutic target for GBM. This review highlights and summarizes the phosphatases that have crucial roles in the regulation of oncogenic signaling in GBM cells.
Insights
Glioblastoma (GBM) remains deadly due to difficult resection and treatment resistance. This review highlights protein phosphatases, which regulate cancer signaling, as potential new therapeutic targets for GBM.
Area of Science:
- Neuro-oncology
- Molecular Biology
- Cancer Signaling
Background:
- Glioblastoma (GBM) is the most prevalent and lethal primary brain tumor.
- Current treatments face challenges due to incomplete tumor resection and resistance to chemoradiotherapy.
- Despite advances in understanding GBM molecular signaling, targeted therapies have yielded unsatisfactory results.
Purpose of the Study:
- To review and summarize the critical roles of protein phosphatases in regulating oncogenic signaling pathways in GBM.
- To highlight the potential of phosphatases as novel therapeutic targets for glioblastoma.
Main Methods:
- Literature review of recent studies on GBM molecular signaling.
- Analysis of research on protein phosphatases and their function in cancer.
- Synthesis of information on phosphatases involved in GBM oncogenesis.
Main Results:
- Protein phosphatases antagonize phosphorylation signaling, crucial for cancer cell regulation.
- Deregulation of specific phosphatases has been implicated in GBM tumorigenesis.
- Understanding phosphatase-mediated signaling is key to developing new GBM therapies.
Conclusions:
- Protein phosphatases play significant roles in GBM cell signaling and tumor growth.
- Targeting specific phosphatases represents a promising strategy for novel adjuvant therapies in glioblastoma.
- Further elucidation of phosphatase mechanisms is essential for therapeutic application in GBM.
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