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Although therapeutic strategies that disrupt this balance to induce lethal oxidative stress and ferroptosis have emerged as promising anticancer approaches, the upstream signaling mechanisms that constrain ROS accumulation under physiologically relevant stress conditions remain incompletely understood. Here, we identify the stress-responsive kinases SMG1 and DNA-dependent protein kinase (DNA-PK) as functionally redundant regulators of redox homeostasis and ferroptosis resistance. Genetic or pharmacological inhibition of either kinase triggers ferroptotic cell death, accompanied by marked accumulation of total ROS, ferrous iron, and lipid hydroperoxides. Mechanistically, under mild oxidative stress, SMG1 and DNA-PK cooperatively phosphorylate the central antioxidant transcription factor NRF2 at serine 13 and serine 40, weakening its interaction with the negative regulator KEAP1 and promoting NRF2 accumulation and transcriptional activation. Transcriptomic profiling of de novo mRNAs revealed that inhibition of either kinase is sufficient to suppress NRF2-driven antioxidant gene expression. In contrast, excessive oxidative stress overrides this pro-survival pathway and redirects signaling toward anti-survival responses mediated by ATF4, ATM\u2013CHK2, and JNK\/p38 pathways. Collectively, these findings uncover a previously unrecognized SMG1\/DNA-PK\u2013NRF2 signaling axis that functions as a redox stress\u2013intensity\u2013dependent switch governing cell fate decisions between antioxidant adaptation and ferroptotic death. Targeting this axis may represent a promising therapeutic strategy for cancer treatment.<\/jats:p>","DOI":"10.1038\/s41392-026-02892-1","type":"journal-article","created":{"date-parts":[[2026,8,3]],"date-time":"2026-08-03T00:02:17Z","timestamp":1785715337000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Two stress-responsive kinases suppress ferroptosis by activating antioxidant programs under mild oxidative stress"],"prefix":"10.1038","volume":"11","author":[{"given":"Yumiko","family":"Fujikawa","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirotatsu","family":"Imai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tetsuo","family":"Onuki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kouji","family":"Hoshino","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marco A.","family":"De Velasco","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuhiko","family":"Matsuo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hitomi","family":"Kurosawa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyoko","family":"Aoyagi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroko","family":"Hirose","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoshie","family":"Nakamura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akiko","family":"Uchiyama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kae","family":"Suzuki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariko","family":"Mizuguchi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hidehisa","family":"Takahashi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroyuki","family":"Osada","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noritaka","family":"Kagaya","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kazuo","family":"Shin-ya","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroyuki","family":"Satofuka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5385-8201","authenticated-orcid":false,"given":"Yukinari","family":"Kato","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1563-1134","authenticated-orcid":false,"given":"Hidehito","family":"Kuroyanagi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daisuke","family":"Utsumi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenzo","family":"Takahashi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Nakayama","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirotsugu","family":"Uemura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroji","family":"Uemura","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4376-5674","authenticated-orcid":false,"given":"Minoru","family":"Yoshida","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shigeo","family":"Ohno","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Akio","family":"Yamashita","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,3]]},"reference":[{"key":"2892_CR1","doi-asserted-by":"publisher","first-page":"931","DOI":"10.1038\/nrd4002","volume":"12","author":"C Gorrini","year":"2013","unstructured":"Gorrini, C., Harris, I. 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