Volume 41, Issue 7 pp. 560-575
ORIGINAL ARTICLE
Open Access

The role of the HIF-1α/ALYREF/PKM2 axis in glycolysis and tumorigenesis of bladder cancer

Jing-Zi Wang

Jing-Zi Wang

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

These authors contributed equally to this study

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Wei Zhu

Wei Zhu

Research Division of Clinical Pharmacology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

These authors contributed equally to this study

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Jie Han

Jie Han

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

These authors contributed equally to this study

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Xiao Yang

Xiao Yang

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

These authors contributed equally to this study

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Rui Zhou

Rui Zhou

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

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Hong-Cheng Lu

Hong-Cheng Lu

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

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Hao Yu

Hao Yu

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

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Wen-Bo Yuan

Wen-Bo Yuan

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

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Peng-Chao Li

Peng-Chao Li

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

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Jun Tao

Jun Tao

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

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Qiang Lu

Corresponding Author

Qiang Lu

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

Correspondence

Qiang Lu and Haiwei Yang, Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210000, Jiangsu, P. R. China

Email: [email protected]; [email protected]

Ji-Fu Wei, Research Division of Clinical Pharmacology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210000, P. R. China

Email: [email protected]

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Ji-Fu Wei

Corresponding Author

Ji-Fu Wei

Research Division of Clinical Pharmacology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

Correspondence

Qiang Lu and Haiwei Yang, Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210000, Jiangsu, P. R. China

Email: [email protected]; [email protected]

Ji-Fu Wei, Research Division of Clinical Pharmacology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210000, P. R. China

Email: [email protected]

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Haiwei Yang

Corresponding Author

Haiwei Yang

Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu, 210000 P. R. China

Correspondence

Qiang Lu and Haiwei Yang, Department of Urology, the First Affiliated Hospital of Nanjing Medical University, Nanjing 210000, Jiangsu, P. R. China

Email: [email protected]; [email protected]

Ji-Fu Wei, Research Division of Clinical Pharmacology, the First Affiliated Hospital of Nanjing Medical University, Nanjing, Jiangsu 210000, P. R. China

Email: [email protected]

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First published: 15 May 2021
Citations: 66

Abstract

Background

As a rate-limiting enzyme of glycolysis, pyruvate kinase muscle isozyme M2 (PKM2) participates in tumor metabolism and growth. The regulatory network of PKM2 in cancer is complex and has not been fully studied in bladder cancer. The 5-methylcytidine (m5C) modification in PKM2 mRNA might participate in the pathogenesis of bladder cancer and need to be further clarified. This study aimed to investigate the biological function and regulatory mechanism of PKM2 in bladder cancer.

Methods

The expression of PKM2 and Aly/REF export factor (ALYREF) was measured by Western blotting, qRT-PCR, and immunohistochemistry. The bioprocesses of bladder cancer cells were demonstrated by a series of experiments in vitro and in vivo. RNA immunoprecipitation, RNA-sequencing, and dual-luciferase reporter assays were conducted to explore the potential regulatory mechanisms of PKM2 in bladder cancer.

Results

In bladder cancer, we first demonstrated that ALYREF stabilized PKM2 mRNA and bound to its m5C sites in 3′-untranslated regions. Overexpression of ALYREF promoted bladder cancer cell proliferation by PKM2-mediated glycolysis. Furthermore, high expression of PKM2 and ALYREF predicted poor survival in bladder cancer patients. Finally, we found that hypoxia-inducible factor-1alpha (HIF-1α) indirectly up-regulated the expression of PKM2 by activating ALYREF in addition to activating its transcription directly.

Conclusions

The m5C modification in PKM2 mRNA in the HIF-1α/ALYREF/PKM2 axis may promote the glucose metabolism of bladder cancer, providing a new promising therapeutic target for bladder cancer.

CONFLICT OF INTEREST

The authors declared no conflicts.

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