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Hypoxia inhibits ferritinophagy-mediated ferroptosis in esophageal squamous cell carcinoma via the USP2-NCOA4 axis

Abstract

Esophageal squamous cell carcinoma (ESCC) is a prevalent malignancy of the digestive system. Hypoxia is a crucial player in tumor ferroptosis resistance. However, the molecular mechanism of hypoxia-mediated ferroptosis resistance in ESCC remains unclear. Here, USP2 expression was decreased in ESCC cell lines subjected to hypoxia treatment and was lowly expressed in clinical ESCC specimens. Ubiquitin-specific protease 2 (USP2) depletion facilitated cell growth, which was blocked in USP2-overexpressing cells. Moreover, USP2 silencing enhanced the iron ion concentration and lipid peroxidation accumulation as well as suppressed ferroptosis, while upregulating USP2 promoted ferroptotic cell death in ESCC cells. Furthermore, knockout of USP2 in ESCC models discloses the essential role of USP2 in promoting ESCC tumorigenesis and inhibiting ferroptosis. In contrast, overexpression of USP2 contributes to antitumor effect and ferroptosis events in vivo. Specifically, USP2 stably bound to and suppressed the degradation of nuclear receptor coactivator 4 (NCOA4) by eliminating the Lys48-linked chain, which in turn triggered ferritinophagy and ferroptosis in ESCC cells. Our findings suggest that USP2 plays a crucial role in iron metabolism and ferroptosis and that the USP2/NCOA4 axis is a promising therapeutic target for the management of ESCC.

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Fig. 1: Hypoxia is negatively correlated with ferroptosis in ESCC cells.
Fig. 2: Hypoxia promotes ferroptosis resistance in ESCC.
Fig. 3: USP2 is downregulated in hypoxic ESCC cells.
Fig. 4: Upregulation of USP2 facilitates ferroptosis in ESCC cells.
Fig. 5: USP2-driven ferroptotic cell death correlates with activation of autophagy.
Fig. 6: USP2 interacts with NCOA4.
Fig. 7: USP2 blcoks NCOA4 ubiquitination.
Fig. 8: USP2 regulates ESCC tumorigenesis in vivo.

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Data availability

The datasets used and analyzed during the current study are available from the corresponding author upon reasonable request.

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Acknowledgements

We would like to thank the Core Facility of Jiangsu Provincial People’s Hospital for its help in the detection of experimental samples.

Funding

This work was supported by the Natural Science Foundation of Jiangsu Province (BK20201080), and the National Natural Science Foundation of China (82003228, 82003235, 82102830, 82102831), and the Research project of clinical medical science and technology development fund of Jiangsu University (No:JLY2021097), and the Court-level Natural Science Foundation Project of Jurong People’s Hospital (Nos. JY20221001, JY20231005).

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JS, XD, JZ and QL contributed to the design of the study. JS, JZ, YS, and QG performed the experiments. HC, MZ, CZ and LL analyzed and interpreted the data. JZ, YZ and WW prepared all figures. JS, XD, JZ and QL contributed to the writing and revision of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Wei Wang, Qing Li or Xiaoke Di.

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Song, J., Zhang, J., Shi, Y. et al. Hypoxia inhibits ferritinophagy-mediated ferroptosis in esophageal squamous cell carcinoma via the USP2-NCOA4 axis. Oncogene (2024). https://doi.org/10.1038/s41388-024-03050-z

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