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Updated: Sep 19, 2025
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Assays for Validating Histone Acetyltransferase Inhibitors
Published on: August 6, 2020
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Histone Deacetylase Inhibitors Target DNA Replication Regulators and Replication Stress in Ewing Sarcoma Cells.
Stacia L Koppenhafer1, Elizabeth L Geary1, Mary V Thomas1
1Division of Pediatric Hematology/Oncology, Department of Pediatrics, University of Iowa, Iowa City, Iowa.
Cancer Research Communications
|June 6, 2025
Summary
Histone deacetylase (HDAC) inhibitors disrupt DNA replication in Ewing sarcoma by reducing key proteins like RRM1, RRM2, CHK1, WEE1, MCM2-7, and CDT1. This impairs the cancer cells' ability to replicate their DNA and respond to replication stress.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Ewing sarcoma is driven by the EWS::FLI1 fusion gene.
- Ewing sarcoma cells are sensitive to DNA replication targeting agents.
- Histone deacetylases (HDAC) are implicated in cancer cell regulation.
Purpose of the Study:
- To investigate the molecular mechanisms by which HDAC inhibitors affect Ewing sarcoma cells.
- To identify specific proteins and pathways targeted by HDAC inhibitors in Ewing sarcoma.
- To understand how HDAC inhibitors impact DNA replication and stress response in this cancer.
Main Methods:
- Treatment of Ewing sarcoma cells with various HDAC inhibitors (fimepinostat, romidepsin, panobinostat).
- Protein level analysis using proteomics.
- Gene expression analysis using transcriptomics.
- Assessment of DNA replication and DNA replication stress response.
Main Results:
- HDAC inhibitors downregulate RRM1, RRM2, CHK1, and WEE1 protein levels.
- HDAC inhibitors impair DNA replication in Ewing sarcoma cells.
- HDAC inhibitors reduce expression of prereplication complex components (MCM2-7, CDT1).
- HDAC inhibitors decrease BRD4 protein levels, affecting EWS::FLI1 transcription and DNA replication.
Conclusions:
- HDAC inhibitors broadly disrupt DNA replication and the response to replication stress in Ewing sarcoma.
- Targeting HDACs offers a therapeutic strategy by interfering with essential DNA replication machinery.
- HDAC inhibitors impact both the oncogenic transcriptional program and DNA replication in Ewing sarcoma.
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