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Genetic Profiling and Genome-Scale Dropout Screening to Identify Therapeutic Targets in Mouse Models of Malignant Peripheral Nerve Sheath Tumor
Published on: August 25, 2023
Role of MAP kinase pathways in primitive neuroectodermal tumors
C Damodar Reddy1, S Marwaha, R Patti
1Division of Neuro-oncology, Joseph Stokes Research Institute, The Children's Hospital of Philadelphia, PA 19104, USA. reddyd-@email.chop.edu
Anticancer Research
|November 29, 2001
Summary
Mitogen-activated protein kinase (MAPK) and Phosphatidylinositol-3 kinase (PI-3K)/Akt pathways are crucial for cell functions. In Primitive Neuroectodermal Tumors (PNETs), the Raf-1/ERK pathway is activated, suggesting its role in tumor development.
Area of Science:
- Oncology
- Molecular Biology
- Cell Signaling
Background:
- Mitogen-activated protein kinase (MAPK) and Phosphatidylinositol-3 kinase (PI-3K)/Akt signaling pathways regulate critical cellular processes like proliferation, differentiation, and apoptosis.
- The activity of these pathways is tightly controlled by the phosphorylation and dephosphorylation of specific threonine/tyrosine residues.
Purpose of the Study:
- To investigate the expression patterns and activity of MAP kinases and Akt in Primitive Neuroectodermal Tumors (PNETs).
- To identify key signaling pathways involved in the pathogenesis of PNETs.
Main Methods:
- Analysis of kinase expression and activity in primary PNETs and cell lines.
- Assessment of phosphorylation levels of key signaling molecules, including ERK1/2 and Akt.
- Comparison of kinase expression in tumor tissues versus normal brain tissue.
Main Results:
- Elevated kinase activity of extracellular signal-regulated kinase (ERK) was observed in both PNET primary tumors and cell lines, indicated by increased ERK1/2 phosphorylation.
- No significant activation of C-jun N-terminal kinase (JNK) or p38 MAPK was detected.
- Expression of Raf-1, an upstream activator of ERK, was significantly increased in primary PNETs compared to normal brain.
- Increased phosphorylation of Akt, downstream of PI-3K, was also found in primary PNETs.
Conclusions:
- The Raf-1/ERK signaling module within the MAPK pathway is activated in PNETs.
- These findings suggest a significant role for the activated Raf-1/ERK pathway in the development and progression of Primitive Neuroectodermal Tumors.
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