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Restore the brake on tumor progression.
Renata E Gordon1, Li Zhang2, Zeng-Jie Yang3
1Cancer Biology Program, Fox Chase Cancer Center, Temple University Health System, Philadelphia, PA 19111, USA.
Biochemical Pharmacology
|April 9, 2017
Summary
Nestin protein fuels medulloblastoma growth by disrupting Sonic hedgehog (Shh) signaling negative feedback. Repressing Nestin offers a potential therapeutic strategy for Shh-associated cancers.
Area of Science:
- Developmental Biology
- Cancer Biology
- Molecular Oncology
Background:
- Sonic hedgehog (Shh) signaling is crucial for normal development but its hyperactivation drives malignancies like medulloblastoma (MB).
- A negative feedback loop involving Gli3 normally regulates Shh signaling, but its disruption in cancer remains incompletely understood.
Purpose of the Study:
- To elucidate the mechanism by which tumor cells sustain aberrant Shh signaling in medulloblastoma.
- To identify novel therapeutic targets for Shh-associated cancers.
Main Methods:
- Investigated the role of Nestin in medulloblastoma formation.
- Analyzed the interaction between Nestin, Gli3, and Shh signaling pathways.
Main Results:
- Tumor cells in medulloblastoma express Nestin, a protein that abolishes Gli3-mediated negative feedback on Shh signaling.
- Nestin expression is essential for medulloblastoma development by ensuring sustained Shh pathway activation.
- Disruption of the Gli3-mediated negative feedback loop is a key event in MB tumorigenesis.
Conclusions:
- Nestin plays a critical role in medulloblastoma pathogenesis by overriding normal Shh signaling regulation.
- Targeting Nestin to restore negative feedback represents a promising therapeutic avenue for medulloblastoma and other Shh-driven cancers.