Glioblastoma (GBM) is the most malignant form of glioma. Glioma stem cells (GSCs) contribute to the initiation, progression, and recurrence of GBM as a result of their self-renewal potential and tumorigenicity. Cyclin-dependent kinase 8 (CDK8) belongs to the transcription-related CDK family. Although CDK8 has been shown to be implicated in the malignancy of several types of cancer, its functional role and mechanism in gliomagenesis remain largely unknown. Here, we demonstrate how CDK8 plays an essential role in maintaining stemness and tumorigenicity in GSCs. The genetic inhibition of CDK8 by shRNA or CRISPR interference resulted in an abrogation of the self-renewal potential and tumorigenicity of patient-derived GSCs, which could be significantly rescued by the ectopic expression of c-MYC, a stem cell transcription factor. Moreover, we demonstrated that the pharmacological inhibition of CDK8 significantly attenuated the self-renewal potential and tumorigenicity of GSCs. CDK8 expression was significantly higher in human GBM tissues than in normal brain tissues, and its expression was positively correlated with stem cell markers including c-MYC and SOX2 in human GBM specimens. Additionally, CDK8 expression is associated with poor survival in GBM patients. Collectively, these findings highlight the importance of the CDK8-c-MYC axis in maintaining stemness and tumorigenicity in GSCs; these findings also identify the CDK8-c-MYC axis as a potential target for GSC-directed therapy.
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CDC42EP3 promotes glioma progression via regulation of CCND1
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We wish to thank Dr. H. Hojo (University of Tokyo) for technical training in RNA-seq data analysis. RNA-seq data and survival analysis were performed using the super-computing resource provided by Human Genome Center, the Institute of Medical Science, the University of Tokyo. This work was supported in part by the Japan Society for the Promotion of Science (20H03407 to EH), and the Extramural Collaborative Research Grant of Cancer Research Institute, Kanazawa University.
Conflict of interest
TKadota, MY, TKitao, and HS are employees of Kyoto Pharmaceutical Industries, Ltd. EH is supported by a research fund from Kyoto Pharmaceutical Industries, Ltd. The other authors declare no potential competing interests.
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Fukasawa, K., Kadota, T., Horie, T. et al. CDK8 maintains stemness and tumorigenicity of glioma stem cells by regulating the c-MYC pathway. Oncogene 40, 2803–2815 (2021). https://doi.org/10.1038/s41388-021-01745-1
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