Histone Demethylase KDM4B Accelerates the Progression of Glioblastoma Via the Epigenetic Regulation of MYC Stability

Overview

Journal Clin Epigenetics

Publisher Biomed Central

Specialty Genetics

Date 2023 Dec 14

PMID 38093312

Authors

Zhongze Wang

Huarui Cai

Zekun Li

Wei Sun

Erhu Zhao

Hongjuan Cui

Affiliations

Soon will be listed here.

Abstract

Background: Glioblastoma (GBM) is the most malignant and invasive human brain tumor. Histone demethylase 4B (KDM4B) is abnormally expressed in GBM, but the molecular mechanisms by which KDM4B affects the malignant tumor progression are not well defined.

Methods: GBM cell lines and xenograft tumor samples were subjected to quantitative PCR (qPCR), Western blot, immunohistochemical staining (IHC), as well as ubiquitination, immunoprecipitation (IP), and chromatin immunoprecipitation (ChIP) assays to investigate the role of KDM4B in the progression of GBM.

Results: Here, we report that KDM4B is an epigenetic activator of GBM progression. Abnormal expression of KDM4B is correlated with a poor prognosis in GBM patients. In GBM cell lines, KDM4B silencing significantly inhibited cell survival, proliferation, migration, and invasion, indicating that KDM4B is essential for the anchorage-independent growth and tumorigenic activity of GBM cells. Mechanistically, KDM4B silencing led to downregulation of the oncoprotein MYC and suppressed the expression of cell cycle proteins and epithelial-to-mesenchymal transition (EMT)-related proteins. Furthermore, we found that KDM4B regulates MYC stability through the E3 ligase complex SCF and epigenetically activates the transcription of CCNB1 by removing the repressive chromatin mark histone H3 lysine 9 trimethylation (H3K9me3). Finally, we provide evidence that KDM4B epigenetically activates the transcription of miR-181d-5p, which enhances MYC stability.

Conclusions: Our study has uncovered a KDM4B-dependent epigenetic mechanism in the control of tumor progression, providing a rationale for utilizing KDM4B as a promising therapeutic target for the treatment of MYC-amplified GBM.

Citing Articles

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Chen Q, Liu S, Wang Y, Tong M, Sun H, Dong M Int J Nanomedicine. 2024; 19:10415-10434.

PMID: 39430312 PMC: 11491100. DOI: 10.2147/IJN.S477587.

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