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Interest in the mechanisms of system x<jats:sub>c<\/jats:sub><jats:sup>\u2212<\/jats:sup> function soared with the recognition that system x<jats:sub>c<\/jats:sub><jats:sup>\u2212<\/jats:sup> presents the most upstream node of ferroptosis, a recently described form of regulated necrosis relevant for degenerative diseases and cancer. Since targeting system x<jats:sub>c<\/jats:sub><jats:sup>\u2212<\/jats:sup> hold the great potential to efficiently combat tumor growth and metastasis of certain tumors, we disrupted the substrate\u2010specific subunit of system x<jats:sub>c<\/jats:sub><jats:sup>\u2212<\/jats:sup>, xCT (SLC7A11) in the highly metastatic mouse B16F10 melanoma cell line and assessed the impact on tumor growth and metastasis. Subcutaneous injection of tumor cells into the syngeneic B16F10 mouse melanoma model uncovered a marked decrease in the tumor\u2010forming ability and growth of KO cells compared to control cell lines. Strikingly, the metastatic potential of KO cells was markedly reduced as shown in several in vivo models of experimental and spontaneous metastasis. Accordingly, survival rates of KO tumor\u2010bearing mice were significantly prolonged in contrast to those transplanted with control cells. Analyzing the in vitro ability of KO and control B16F10 cells in terms of endothelial cell adhesion and spheroid formation revealed that xCT expression indeed plays an important role during metastasis. Hence, system x<jats:sub>c<\/jats:sub><jats:sup>\u2212<\/jats:sup> emerges to be essential for tumor metastasis in mice, thus qualifying as a highly attractive anticancer drug target, particularly in light of its dispensable role for normal life in mice.<\/jats:p>","DOI":"10.1002\/ijc.33262","type":"journal-article","created":{"date-parts":[[2020,8,20]],"date-time":"2020-08-20T20:43:40Z","timestamp":1597956220000},"page":"3224-3235","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":58,"title":["Loss of the cystine\/glutamate antiporter in melanoma abrogates tumor metastasis and markedly increases survival rates of mice"],"prefix":"10.1002","volume":"147","author":[{"given":"Mami","family":"Sato","sequence":"first","affiliation":[{"name":"Laboratory of Biochemistry and Molecular Biology, Department of Medical Technology, Faculty of Medicine Niigata University  Niigata Japan"},{"name":"Sakeology Center Niigata University  Niigata 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