Abstract
Background
Cyclin-dependent kinase 5 (CDK5) is a member of the cyclin-dependent kinase family, and unlike the rest of the members of the family, its kinase activity is independent of cyclins. Accumulating evidence has shown that CDK5 plays a significant role in the progress of tumorigenesis except in nervous system. In particular, the expression of CDK5 and its function in esophageal cancer (ESCA) remain unknown.
Methods
With TCGA and GEO databases, CDK5 was analyzed with the expression, predicted value, clinical relationship, functional enrichment, immune cell infiltration and immune molecules in ESCA. In addition, we explored the CDK5 expression with local datasets and the influence of CDK5 on proliferation, migration and invasion behaviors of the esophageal squamous cell carcinoma (ESCC) cells in vitro and in vivo experiments.
Results
CDK5 expression was upregulated in ESCA, and this regulation has been verified in cell lines of ESCC. Further analysis has found that the expression of CDK5 was correlated with race, weight, BMI, histological type and tumor central location in ESCA. KEGG analysis revealed that CDK5 was involved in the progress of cancers, innate immune system and PI3K-Akt signaling pathway. CDK5 was closely related to immune cells and immune molecules in ESCA. Functional experiments confirmed CDK5 was an oncogene in ESCC by in vivo and in vitro models.
Conclusions
This study shows that CDK5 is a risk factor to promote tumor progression, and Roscovitine could be one of the effective tools in the therapy of ESCA.
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Data availability
The datasets acquired and analyzed in this study are available from the corresponding author.
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Funding
This research was supported by grant from the National Natural Science Foundation of China (NO.81601043).
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RL and YS (Yucheng Sheng) completed the experiments. YH, YS (Yucheng Sheng), DW, YS (Yang Shu) analyzed the data. YZ and YS (Yang Shu) designed this work. YS (Yang Shu) wrote this manuscript. All the authors contributed to reading and revising the manuscript.
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This study with human tissues was approved by the ethics committee of the Affiliated Hospital of Jiangsu University. The procedures with human tissues were performed as ethical standards of the ethics committee, the Helsinki Declaration of 1975 and its later amendments(ethical code:KY201902).
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All the authors declare that there is no conflict of interest in this paper.
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Ling, R., Sheng, Y., Hu, Y. et al. Comprehensive analysis of CDK5 as a novel biomarker for progression in esophageal cancer. Esophagus 20, 502–514 (2023). https://doi.org/10.1007/s10388-023-00988-z
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DOI: https://doi.org/10.1007/s10388-023-00988-z