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Mapping the Structure-Function Relationships of Disordered Oncogenic Transcription Factors Using Transcriptomic Analysis
Published on: June 27, 2020
Let-7a is a direct EWS-FLI-1 target implicated in Ewing's sarcoma development
Claudio De Vito1, Nicolo Riggi, Mario-Luca Suvà
1Faculty of Biology and Medicine, Institute of Pathology, Centre Hospitalier Universitaire Vaudois, University of Lausanne, Lausanne, Switzerland.
Plos One
|August 20, 2011
Summary
Ewing sarcoma family tumors (ESFT) show distinct microRNA signatures. Suppressed let-7a, driven by EWS-FLI-1, promotes ESFT growth via HMGA2, offering a potential therapeutic target.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Ewing sarcoma family tumors (ESFT) are aggressive pediatric bone cancers.
- The EWS-FLI-1 fusion protein drives ESFT development by altering gene expression.
- MicroRNAs (miRNAs) are implicated in ESFT pathogenesis.
Purpose of the Study:
- To investigate global miRNA expression profiles in ESFT.
- To identify specific miRNAs and their targets involved in ESFT tumorigenesis.
- To evaluate let-7a as a potential therapeutic target for ESFT.
Main Methods:
- Comparative miRNA array analysis of ESFT cell lines and mesenchymal stem cells.
- Validation of EWS-FLI-1 regulation of miRNA targets (let-7a, HMGA2).
- In vivo studies using mouse models with systemic delivery of synthetic let-7a.
Main Results:
- ESFT exhibits a unique miRNA signature, including upregulated miRNA 17-92 and downregulated let-7 family miRNAs.
- EWS-FLI-1 directly represses let-7a, contributing to ESFT cell tumorigenicity.
- let-7a targets HMGA2, and its restoration inhibits ESFT growth in vivo.
Conclusions:
- Deregulation of let-7a and its target HMGA2 is crucial in ESFT development.
- let-7a represents a promising therapeutic target for ESFT.
- Restoring let-7a expression can inhibit ESFT growth in vivo.
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