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Comprehensive protein tyrosine phosphatase mRNA profiling identifies new regulators in the progression of glioma
Annika M Bourgonje1, Kiek Verrijp2, Jan T G Schepens1
1Department of Cell Biology, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Geert Grooteplein 26, 6525, GA, Nijmegen, The Netherlands.
Abstract:
The infiltrative behavior of diffuse gliomas severely reduces therapeutic potential of surgical resection and radiotherapy, and urges for the identification of new drug-targets affecting glioma growth and migration. To address the potential role of protein tyrosine phosphatases (PTPs), we performed mRNA expression profiling for 91 of the 109 known human PTP genes on a series of clinical diffuse glioma samples of different grades and compared our findings with in silico knowledge from REMBRANDT and TCGA databases. Overall PTP family expression levels appeared independent of characteristic genetic aberrations associated with lower grade or high grade gliomas. Notably, seven PTP genes (DUSP26, MTMR4, PTEN, PTPRM, PTPRN2, PTPRT and PTPRZ1) were differentially expressed between grade II-III gliomas and (grade IV) glioblastomas. For DUSP26, PTEN, PTPRM and PTPRT, lower expression levels correlated with poor prognosis, and overexpression of DUSP26 or PTPRT in E98 glioblastoma cells reduced tumorigenicity. Our study represents the first in-depth analysis of PTP family expression in diffuse glioma subtypes and warrants further investigations into PTP-dependent signaling events as new entry points for improved therapy.
Insights
Protein tyrosine phosphatases (PTPs) show altered expression in diffuse gliomas, with seven PTP genes differing between lower-grade gliomas and glioblastomas. Lower expression of some PTPs correlates with poor prognosis, suggesting PTPs as potential therapeutic targets.
Area of Science:
- Neuro-oncology
- Molecular Biology
- Cancer Genetics
Background:
- Diffuse gliomas exhibit infiltrative growth, limiting treatment efficacy.
- Identifying novel therapeutic targets is crucial for improving glioma patient outcomes.
- Protein tyrosine phosphatases (PTPs) play roles in cell signaling and cancer, but their role in diffuse gliomas is not fully understood.
Purpose of the Study:
- To investigate the expression profile of PTP genes in diffuse gliomas.
- To identify PTPs that are differentially expressed between glioma grades.
- To explore the prognostic significance and therapeutic potential of specific PTPs in gliomas.
Main Methods:
- mRNA expression profiling of 91 human PTP genes in clinical diffuse glioma samples.
- Comparison of expression data with in silico databases (REMBRANDT, TCGA).
- Correlation analysis of PTP expression with glioma grade, genetic aberrations, and patient prognosis.
- Functional validation of DUSP26 and PTPRT in glioblastoma cell models.
Main Results:
- PTP gene expression levels were generally independent of common genetic aberrations in gliomas.
- Seven PTP genes (DUSP26, MTMR4, PTEN, PTPRM, PTPRN2, PTPRT, PTPRZ1) showed differential expression between grade II-III gliomas and glioblastoma (grade IV).
- Lower expression of DUSP26, PTEN, PTPRM, and PTPRT correlated with poorer patient prognosis.
- Overexpression of DUSP26 or PTPRT reduced tumorigenicity in glioblastoma cells.
Conclusions:
- This study provides the first comprehensive analysis of PTP family expression in diffuse gliomas.
- Specific PTPs are dysregulated in higher-grade gliomas and associated with patient outcomes.
- PTP-mediated signaling pathways represent promising targets for novel glioma therapies.
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