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Here we show that this attrition is driven largely by ferroptosis, a metabolically regulated, iron-dependent cell-death pathway, and that it can be blocked to augment HSC expansion. Inhibiting ferroptosis with liproxstatin-1 or ferrostatin-1 markedly increases the expansion of cord blood and adult HSCs consistently across donors in both widely used serum-free cultures and recently reported chemically defined conditions. The expanded cells retain phenotypic and molecular stem cell identity and mediate improved durable, multilineage engraftment in xenotransplanted mice without genotoxicity or aberrant haematopoiesis. Mechanistically, ferroptosis blockade is accompanied by upregulated ribosome biogenesis and cholesterol synthesis, increasing levels of 7-dehydrocholesterol\u2014a potent endogenous ferroptosis inhibitor that itself promotes HSC expansion. Crucially, this approach enhances yields of therapeutically genome-modified HSCs, paving a path for clinical applications.<\/jats:p>","DOI":"10.1038\/s41556-025-01814-7","type":"journal-article","created":{"date-parts":[[2025,11,18]],"date-time":"2025-11-18T10:02:59Z","timestamp":1763460179000},"page":"2214-2224","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Inhibiting ferroptosis enhances ex vivo expansion of human haematopoietic stem cells"],"prefix":"10.1038","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9087-1293","authenticated-orcid":false,"given":"Lucrezia","family":"della Volpe","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew J.","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7651-0547","authenticated-orcid":false,"given":"Mateusz","family":"Antoszewski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9687-0953","authenticated-orcid":false,"given":"Amy A.","family":"Deik","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ksenia R.","family":"Safina","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Teng","family":"Gao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chun-Jie","family":"Guo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianyi","family":"Ye","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Lyu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jorge D.","family":"Martin-Rufino","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicole","family":"Castano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4086-5709","authenticated-orcid":false,"given":"Jonathan","family":"Good","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yaniris","family":"Molina-Aponte","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiawei","family":"Zhao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8259-9245","authenticated-orcid":false,"given":"Clary B.","family":"Clish","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0735-1570","authenticated-orcid":false,"given":"Peter","family":"van Galen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0044-443X","authenticated-orcid":false,"given":"Vijay G.","family":"Sankaran","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,11,18]]},"reference":[{"key":"1814_CR1","doi-asserted-by":"publisher","first-page":"1472","DOI":"10.1056\/NEJMp078166","volume":"357","author":"FR Appelbaum","year":"2007","unstructured":"Appelbaum, F. 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