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Proteomic studies of pediatric medulloblastoma tumors with 17p deletion
Athanasios K Anagnostopoulos1, Chrissa Papathanassiou, Kalliopi Karamolegou
1Proteomics Research Unit, Center of Basic Research II, Biomedical Research Foundation of the Academy of Athens , Athens 115 27, Greece.
Abstract:
CNS tumors are the leading cause of cancer-related death in children. Medulloblastoma is the commonest pediatric CNS malignancy, wherein, despite multimodal therapy with surgery, radiation, and chemotherapy, 5 year survival rates merely approach 60%. Until present, gene expression and cytogenetic studies have produced contradicting findings regarding the molecular background of the specific disease. Through integration of genomics, bioinformatics, and proteomics, the current study aims to shed light at the proteomic-related molecular events responsible for MBL pathophysiology, as well as to provide molecular/protein/pathway answers concerning tumor-onset. Experiments were performed on tissues collected at surgery. With 17p loss being the commonest chromosomal aberrance observed in our sample set, array-CGH were employed to first distinguish for 17p-positive cases. 2-DE coupled to mass spectrometry identification exposed the MBL-specific protein profile. Protein profiles of malignant tissues were compared against profiles of normal cerebellar tissues, and quantitative protein differences were determined. Bioinformatics, functional and database analyses, characterization, and subnetwork profiling generated information on MBL protein interactions. Key molecules of the PI3K/mTOR signaling network were identified via the techniques applied herein. Among the findings IGF2, PI3K, Rictor, MAPKAP1, S6K1, 4EBP1, and ELF4A, as part of the IGF network (implicating PI3K/mTOR), were founded to be deregulated.
Insights
This study reveals deregulated proteins in medulloblastoma (MBL), a common pediatric brain tumor. Key findings implicate the IGF/PI3K/mTOR pathway in MBL development, offering new targets for treatment.
Area of Science:
- Pediatric Oncology
- Molecular Biology
- Proteomics
Background:
- Medulloblastoma (MBL) is the most common pediatric central nervous system (CNS) malignancy and a leading cause of cancer-related death in children.
- Current 5-year survival rates for MBL remain suboptimal at approximately 60% despite multimodal therapy.
- Previous studies on MBL's molecular underpinnings have yielded conflicting results.
Purpose of the Study:
- To investigate the proteomic landscape of MBL to elucidate molecular events driving its pathophysiology.
- To identify protein and pathway alterations associated with MBL tumor onset.
- To integrate genomics, bioinformatics, and proteomics for a comprehensive understanding of MBL.
Main Methods:
- Comparative proteomic analysis using 2-DE coupled with mass spectrometry on MBL tissues versus normal cerebellar tissues.
- Array-comparative genomic hybridization (array-CGH) to identify 17p loss.
- Bioinformatics, functional, and subnetwork analyses to map protein interactions and signaling pathways.
Main Results:
- The study identified a distinct MBL-specific protein profile.
- Quantitative differences in protein expression between malignant and normal tissues were determined.
- Deregulation of key molecules within the Insulin-like Growth Factor 2 (IGF2)/PI3K/mammalian target of rapamycin (mTOR) signaling network, including PI3K, Rictor, MAPKAP1, S6K1, 4EBP1, and ELF4A, was observed.
Conclusions:
- The findings highlight the critical role of the IGF/PI3K/mTOR pathway in medulloblastoma pathogenesis.
- Proteomic alterations provide insights into MBL molecular mechanisms and potential therapeutic targets.
- This integrated approach offers a more comprehensive understanding of MBL compared to previous studies.
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