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HJURP knockdown disrupts clonogenic capacity and increases radiation-induced cell death of glioblastoma cells

Abstract

The Holliday Junction-Recognition Protein (HJURP) was reported as overexpressed in several cancers and also strongly correlated with poor prognosis of patients, especially in glioblastoma (GBM), the most common and deadly type of primary brain tumor. HJURP is responsible for loading the histone H3 variant—the Centromeric Protein A (CENP-A)—at the centromeres in a cell cycle-regulated manner, being required for proper chromosome segregation. Here we investigated HJURP association with survival and radioresistance of different GBM cell lines. HJURP knockdown compromised the clonogenic capacity and severely impaired survival of five distinct GBM cells, while nontumor astrocytes were not affected. U251MG cells showed a robust cell cycle arrest in G2/M phases followed by a drastic increment in cell death after HJURP silencing, while U138MG and U343MG cell lines presented augmented senescence with a comparable increase in cell death. Importantly, we verified that the impact on cell cycle dynamics and clonogenic survival were associated with loss CENP-A at the centromeres. Moreover, radiation resistance was also impacted by HJURP modulation in several GBM cell lines. U87MG, T98G, U138MG, and U343MG cells were all sensitized to ionizing radiation after HJURP reduction. These data reinforce the requirement of HJURP for proliferative capacity and radioresistance of tumor cells, underlining its potential as a promising therapeutic target for GBM.

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Acknowledgements

The authors acknowledge Silvia Regina Andrade Nascimento for technical assistance, Fabiana Rossetto de Morais for flow cytometry analyses and Douglas Elias Santos for graphic art support in the illustration production.

Funding statement

VV was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo—FAPESP (grant #2013/13465–1; grant #2018/05018–9), Programa de Apoio ao Desenvolvimento Científico—PADC (grant no. 256/2017) from the Faculty of Pharmaceutical Sciences of Araraquara and by the Center for Cell-Based Therapy (CEPID/FAPESP; grant #2013/08135–2). RBS and LFMDC received fellowships from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES. CC received fellowships from the Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq.

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Conceptualization: VV and RBS; Investigation: RBS, CC, and LFMDC; Funding acquisition: VV, CPS, WASJr, EME, and MLPL; Data analysis and writing: RBS., BDP and VV.

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Correspondence to Valeria Valente.

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Serafim, R.B., Cardoso, C., Di Cristofaro, L.F.M. et al. HJURP knockdown disrupts clonogenic capacity and increases radiation-induced cell death of glioblastoma cells. Cancer Gene Ther 27, 319–329 (2020). https://doi.org/10.1038/s41417-019-0103-0

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