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Histone H3K9 methyltransferase SETDB1 overexpression correlates with pediatric high-grade gliomas progression and prognosis

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Abstract

Pediatric high-grade gliomas (pHGGs) are heterogeneous, diffuse, and highly infiltrative tumors with dismal prognosis. Aberrant post-translational histone modifications with elevated histone 3 lysine trimethylation (H3K9me3) have been recently implicated in pHGGs’ pathology, conferring to tumor heterogeneity. The present study investigates the potential involvement of H3K9me3 methyltransferase SETDB1 in the cellular function, progression, and clinical significance of pHGG. The bioinformatic analysis detected SETDB1 enrichment in pediatric gliomas compared to the normal brain, as well as positive and negative correlations with a proneural and mesenchymal signature, respectively. In our cohort of pHGGs, SETDB1 expression was significantly increased compared to pLGG and normal brain tissue and correlated with p53 expression, as well as reduced patients’ survival. In accordance, H3K9me3 levels were also elevated in pHGG compared to the normal brain and were associated with worse patient survival. Gene silencing of SETDB1 in two patient-derived pHGG cell lines showed a significant reduction in cell viability followed by reduced cell proliferation and increased apoptosis. SETDB1 silencing further reduced cell migration of pHGG cells and the expression of the mesenchymal markers N-cadherin and vimentin. mRNA analysis of epithelial–mesenchymal transition (EMT) markers upon SETDB1 silencing showed a reduction in SNAI1 levels and downregulation of CDH2 along with the EMT regulator gene MARCKS. In addition, SETDB1 silencing significantly increased the bivalent tumor suppressor gene SLC17A7 mRNA levels in both cell lines, indicating its implication in the oncogenic process.Altogether, our findings demonstrate a predominant oncogenic role of SETDB1 in pHGG which along with elevated H3K9me3 levels correlate significantly to tumor progression and inferior patients’ survival. There is evidence that targeting SETDB1 may effectively inhibit pHGG progression, providing a novel insight into the therapeutic strategies for pediatric gliomas.

Key messages

  • SETDB1 gene expression is enriched in pHGG compared to normal brain.

  • SETDB1 expression is increased in pHGG tissues and associates with reduced patients’ survival.

  • Gene silencing of SETDB1 reduces cell viability and migration.

  • SETDB1 silencing affects mesenchymal markers expression.

  • SETDB1 silencing upregulates SLC17A7 levels.

  • SETDB1 has an oncogenic role in pHGG.

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Availability of supporting data

The data that support the findings of this study are openly available in Affymetrix Human Genome U133 Plus 2.0 Array—Platform GPL570 pediatric brain samples (GSE50161) at http://r2.amc.nl, reference number [26].

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Acknowledgements

We thank Professor Anastasia Konstantinidou (First Department of Pathology, Medical School, National and Kapodistrian University of Athens) for providing the archival normal brain tissues.

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Contributions

Conceptualization: Christina Piperi; methodology: Alexia Klonou, Penelope Korkolopoulou, Angeliki-Ioanna Giannopoulou, Antonios N. Gargalionis; formal analysis and investigation: Dimitrios S. Kanakoglou, Andromachi Pampalou, Panagiotis Sarantis, Andreas Mitsios, Spyros Sgouros; writing—original draft preparation: Christina Piperi, Alexia Klonou; writing—review and editing: Christina Piperi, Penelope Korkolopoulou, Athanasios G. Papavassiliou; resources: Penelope Korkolopoulou, Spyros Sgouros, Andreas Mitsios; supervision: Christina Piperi, Athanasios G. Papavassiliou.

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Correspondence to Athanasios G. Papavassiliou or Christina Piperi.

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Approval was obtained from the ethics committee of the National and Kapodistrian University of Athens Medical School Ethics Committee (27/06/2017, 1617031069). The procedures used in this study adhere to the tenets of the Declaration of Helsinki. Informed consent was obtained from all individual participants included in the study.

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The authors declare no competing interests.

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Klonou, A., Korkolopoulou, P., Giannopoulou, AI. et al. Histone H3K9 methyltransferase SETDB1 overexpression correlates with pediatric high-grade gliomas progression and prognosis. J Mol Med 101, 387–401 (2023). https://doi.org/10.1007/s00109-023-02294-8

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