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CHD4 regulates the DNA damage response and RAD51 expression in glioblastoma
Lisa D McKenzie1, John W LeClair1, Kayla N Miller1
1Division of Oncology, Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA.
Abstract:
Glioblastoma (GBM) is a lethal brain tumour. Despite therapy with surgery, radiation, and alkylating chemotherapy, most people have recurrence within 6 months and die within 2 years. A major reason for recurrence is resistance to DNA damage. Here, we demonstrate that CHD4, an ATPase and member of the nucleosome remodelling and deactetylase (NuRD) complex, drives a component of this resistance. CHD4 is overexpressed in GBM specimens and cell lines. Based on The Cancer Genome Atlas and Rembrandt datasets, CHD4 expression is associated with poor prognosis in patients. While it has been known in other cancers that CHD4 goes to sites of DNA damage, we found CHD4 also regulates expression of RAD51, an essential component of the homologous recombination machinery, which repairs DNA damage. Correspondingly, CHD4 suppression results in defective DNA damage response in GBM cells. These findings demonstrate a mechanism by which CHD4 promotes GBM cell survival after DNA damaging treatments. Additionally, we found that CHD4 suppression, even in the absence of extrinsic treatment, cumulatively increases DNA damage. Lastly, we found that CHD4 is dispensable for normal human astrocyte survival. Since standard GBM treatments like radiation and temozolomide chemotherapy create DNA damage, these findings suggest an important resistance mechanism that has therapeutic implications.
Insights
CHD4 protein promotes glioblastoma (GBM) resistance to DNA damage therapy by regulating DNA repair. Suppressing CHD4 in GBM cells impairs DNA repair, offering potential therapeutic strategies for this lethal brain tumor.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Glioblastoma (GBM) is an aggressive brain tumor with poor prognosis despite standard treatments.
- Treatment resistance, particularly to DNA-damaging agents, is a major cause of GBM recurrence and mortality.
- The role of CHD4 in GBM DNA damage resistance is not fully understood.
Purpose of the Study:
- To investigate the role of CHD4 in glioblastoma cell survival and resistance to DNA damage.
- To explore the mechanism by which CHD4 influences DNA repair pathways in GBM.
- To determine the therapeutic potential of targeting CHD4 in GBM treatment.
Main Methods:
- Analysis of CHD4 expression in GBM patient samples and cell lines using datasets like The Cancer Genome Atlas and Rembrandt.
- Investigating the association between CHD4 expression levels and patient prognosis.
- Experimental manipulation of CHD4 levels (suppression) in GBM cells to assess its impact on DNA damage response and repair.
- Examining the regulation of RAD51 expression by CHD4.
Main Results:
- CHD4 is overexpressed in GBM tissues and cell lines, correlating with poor patient prognosis.
- CHD4 suppression leads to a defective DNA damage response in GBM cells.
- CHD4 regulates the expression of RAD51, a key protein in homologous recombination DNA repair.
- CHD4 suppression increases cumulative DNA damage in GBM cells, even without external treatment.
- CHD4 is not essential for the survival of normal human astrocytes.
Conclusions:
- CHD4 is a key driver of DNA damage resistance in glioblastoma, contributing to treatment failure.
- Targeting CHD4 may represent a novel therapeutic strategy to overcome chemoresistance and radioresistance in GBM.
- Understanding CHD4's role in DNA repair provides insights into glioblastoma pathogenesis and potential vulnerabilities.
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