Abstract
Purpose
The hypoxic tumor microenvironment and the maintenance of stem cells are relevant to the malignancy of prostate cancer (PCa). However, whether HIF-1α in the hypoxic microenvironment mediates the transformation of prostate cancer to a stem cell phenotype and the mechanism have not been elucidated.
Materials and methods
Prostate cancer stem cells (PCSCs) from PC-3 cell lines were examined for the expression of CD44, CD133, ALDH1, HIF-1α, Notch1, and HES1. We observed the effect of knockdown HIF-1α in vitro and mice models and evaluated the impact of HIF-1α on the Notch1 pathway as well as stem cell dedifferentiation. The effects on sphere formation, cell proliferation, apoptosis, cell cycle, and invasive metastasis were evaluated.
Results
In our study, hypoxia upregulated HIF-1α expression and induced a stem cell phenotype through activation of the Notch1 pathway, leading to enhanced proliferation, invasion, and migration of PCa PC-3 cells. The knockdown of HIF-1α significantly inhibited cell dedifferentiation and the ability to proliferate, invade and metastasize. However, the inhibitory effect of knocking down HIF-1α was reversed by Jagged1, an activator of the Notch1 pathway. These findings were further confirmed in vivo, where hypoxia could enhance the tumorigenicity of xenograft tumors by upregulating the expression of HIF-1α to activate the Notch1 pathway. In addition, the expression of HIF-1α and Notch1 was significantly increased in human PCa tissues, and high expression of HIF-1α correlated with the malignancy of PCa.
Conclusion
In a hypoxic environment, HIF-1α promotes PCa cell dedifferentiation to stem-like cell phenotypes by activating the Notch1 pathway and enhancing the proliferation and invasive capacity of PC-3 cells.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by the Chongqing medical scientific research project (Joint project of Chongqing Health Commission and Science and Technology Bureau) (Grant No. 2019ZY023447).
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KW and HZ conceived the study design and designed the experiments. KW, MW and HY acquired, analyzed, interpreted the data, and drafted the manuscript. RD and HZ reviewed the manuscript and provided comments. All the authors read and approved the final manuscript and agree to be accountable for all aspects of the work.
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The authors have no relevant financial or non-financial interests to disclose.
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This study was performed in line with the principles of the Declaration of Helsinki. All procedures related to the use and care of animals in this study were approved by the ethics committee of Chongqing Jiangjin District Hospital of Chinese Medicine.
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Informed consent was obtained from all individual participants included in the study.
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Wu, K., Wu, M., Yang, H. et al. Hypoxia promotes conversion to a stem cell phenotype in prostate cancer cells by activating HIF-1α/Notch1 signaling pathway. Clin Transl Oncol 25, 2138–2152 (2023). https://doi.org/10.1007/s12094-023-03093-w
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DOI: https://doi.org/10.1007/s12094-023-03093-w