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USP44 Overexpression Drives a MYC-Like Gene Expression Program in Neuroblastoma through Epigenetic Reprogramming
Thomas L Ekstrom1,2, Sajjad Hussain3,4, Tibor Bedekovics3
1Mayo Clinic Graduate School of Biomedical Sciences, Rochester, Minnesota.
Molecular Cancer Research : MCR
|May 22, 2024
Summary
USP44, a deubiquitinating enzyme, is linked to aggressive neuroblastoma and poor survival. Targeting USP44 may offer a new therapeutic strategy for this pediatric cancer.
Area of Science:
- Oncology
- Epigenetics
- Molecular Biology
Background:
- Neuroblastoma is a deadly embryonic cancer in children with few identified genetic drivers.
- Epigenetic dysregulation is implicated in neuroblastoma pathogenesis.
- Deubiquitinating enzymes are potential therapeutic targets in cancer.
Purpose of the Study:
- To identify novel therapeutic targets in neuroblastoma using an expression-based screen.
- To investigate the role of deubiquitinating enzymes in neuroblastoma patient survival.
- To elucidate the function of USP44 in neuroblastoma progression.
Main Methods:
- Expression-based computational screening of deubiquitinating enzymes.
- Correlation analysis of USP44 expression with clinical parameters (metastasis, histology, age, MYCN amplification).
- Experimental validation of USP44 function in neuroblastoma cell lines (proliferation, migration, invasion, neuronal development) and RNF20 depletion studies.
Main Results:
- USP44 was identified as a key deubiquitinating enzyme impacting neuroblastoma patient survival.
- High USP44 levels correlate with aggressive disease features and worse survival, irrespective of MYCN amplification.
- USP44 regulates neuroblastoma cell proliferation, migration, invasion, and neuronal differentiation, implicating histone H2B ubiquitination.
Conclusions:
- USP44 is a novel epigenetic regulator promoting aggressive neuroblastoma.
- USP44 represents a potential therapeutic target for improving outcomes in neuroblastoma.
- USP44 activity influences distinct gene sets, including MYC targets, impacting neuroblastoma pathophysiology.
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