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.
[1]Nanjing Med Univ, Affiliated Hosp 1, Dept Radiat Oncol, Nanjing 210029, Peoples R China.
[2]Gen Hosp Western Theater Command, Dept Radiol, Chengdu 600083, Peoples R China.
[3]Jiangsu Univ, Dept Oncol, Jurong Peoples Hosp, Huayang Town 212400, Jurong, Peoples R China.
[4]Suzhou 100 Hosp, Dept Radiol, Suzhou 215000, Peoples R China.
[5]Chongqing Municipal Hlth & Hlth Comm, Chongqing 400042, Peoples R China.
[6]Army Med Ctr, Canc Ctr, Chongqing 400042, Peoples R China.
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