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STUB1-SMYD2 Axis Regulates Drug Resistance in Glioma cells

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Abstract

SET and MYND domain-containing protein 2 (SMYD2) is an important epigenetic regulator that methylates histone and non-histone proteins. The study aimed to investigate the oncogenic role of SMYD2 in gliomas and explore its degradation mechanism induced by cisplatin. Tumor tissue microarray of 441 patients with glioma was collected for SMYD2 immunohistochemical staining. Kaplan–Meier survival curves were constructed using the overall survival values. mRNA-sequencing analysis was performed for understanding the downstream mechanisms mediated by SMYD2. The half-inhibitory concentrations (IC50) of temozolomide and cisplatin in AZ505-treated and control cells were calculated. The potential E3 ubiquitin ligase of SMYD2 was predicted in UbiBrowser and confirmed by a knockdown test. The effect of SMYD2 and its E3 ligase on apoptosis and migration of glioma cells was determined via cell-function assays. High SMYD2 expression correlated with a high WHO stage (P = 0.004) and a low survival probability (P = 0.012). The inhibition of SMYD2 suppressed the process of epithelial to mesenchymal transition (EMT) by downregulating the expression of Collagen 1A1 (COL1A1). AZ505 treatment significantly increased the drug sensitivity of glioma cells. SMYD2 expression was markedly reduced by cisplatin treatment via STIP1 Homology And U-Box Containing Protein 1 (STUB1)-mediated degradation. The knockdown of STUB1 could partly reverse the cell function impairment induced by cisplatin. Our findings suggested that SMYD2 could be a potential drug target for the treatment of gliomas, and STUB1-mediated degradation of SMYD2 plays an important role in reversing chemotherapy resistance in patients with gliomas.

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Acknowledgements

We thank Bullet Edits Limited for the linguistic editing and proofreading of the manuscript.

Funding

This work was supported by the Key Research and Development Program of Zhejiang Province (2019C03044), the Jinhua Science and Technology Research Program (2021–3-044), the Natural Science Foundation of Zhejiang province (LY21H160014), and the Foundation of Jinhua hospital (JY2019-3–001, JY2020-6–04).

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Contributions

KP: carried out the experiments and wrote the manuscript. BH: tissue microarray. LW: assisted with the experiments. JY and WX: designed the experiments and modified the manuscript. All authors contributed to the article and approved the submitted version.

Corresponding authors

Correspondence to Jianlie Yuan or Wenxia Xu.

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Ethics Approval

This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Medical Ethics Committee of Jinhua Central Hospital (Date September 14, 2021; No. 2021–265-001; Jinhua, Zhejiang Province, China).

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Informed consent was obtained from all individual participants included in the study.

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The authors affirm that human research participants provided informed consent for publication of the images in Fig. 1f, g and Table 1.

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The authors declare no competing interests.

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Pan, K., Hu, B., Wang, L. et al. STUB1-SMYD2 Axis Regulates Drug Resistance in Glioma cells. J Mol Neurosci 72, 2030–2044 (2022). https://doi.org/10.1007/s12031-022-02051-5

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  • DOI: https://doi.org/10.1007/s12031-022-02051-5

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