{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,17]],"date-time":"2026-10-17T19:22:19Z","timestamp":1792264939197,"version":"4.4.0"},"reference-count":102,"publisher":"American Society for Clinical Investigation","issue":"14","license":[{"start":{"date-parts":[[2025,7,15]],"date-time":"2025-07-15T00:00:00Z","timestamp":1752537600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Armstrong Family Foundation","award":["N\/A"],"award-info":[{"award-number":["N\/A"]}]},{"name":"Cindy Rosencrans Fund for Triple-Negative Breast Cancer","award":["n\/a"],"award-info":[{"award-number":["n\/a"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,7,15]]},"abstract":"<jats:p>\n                    Brain metastasis is a major cause of breast cancer (BC) mortality, but the cellular and molecular mechanisms have not been fully elucidated. BC cells must breach the blood-brain barrier in order to colonize the brain. Here, we determined that integrin \u03b2\n                    <jats:sub>3<\/jats:sub>\n                    (ITGB3) expression mediated by hypoxia-inducible factor 1 (HIF-1) plays a critical role in metastasis of BC cells to the brain. Hypoxia stimulated BC cell migration and invasion ex vivo and brain colonization in vivo. Knockdown of either HIF-1\u03b1 or ITGB3 expression impaired brain colonization by human or mouse BC cells injected into the cardiac left ventricle. Exposure of BC cells to hypoxia increased expression of ITGB3 and its incorporation into small extracellular vesicles (EVs). EVs harvested from the conditioned medium of hypoxic BC cells showed increased retention in the brain after intracardiac injection that was HIF-1\u03b1 and ITGB3 dependent. EVs from hypoxic BC cells showed binding to brain endothelial cells (ECs), leading to increased EC\u2013BC cell interaction, increased vascular endothelial growth factor receptor 2 signaling, increased EC permeability, and increased transendothelial migration of BC cells. Taken together, our studies implicate HIF-1\u2013stimulated production of ITGB3\n                    <jats:sup>+<\/jats:sup>\n                    EVs as a key mechanism by which hypoxia promotes BC brain metastasis.\n                  <\/jats:p>","DOI":"10.1172\/jci190470","type":"journal-article","created":{"date-parts":[[2025,7,14]],"date-time":"2025-07-14T18:00:41Z","timestamp":1752516041000},"source":"Crossref","is-referenced-by-count":14,"title":["HIF-1 promotes murine breast cancer brain metastasis by increasing production of integrin \u03b23\u2013containing extracellular vesicles"],"prefix":"10.1172","volume":"135","author":[{"given":"Yongkang","family":"Yang","sequence":"first","affiliation":[{"name":"Armstrong Oxygen Biology Research Center and Vascular Program, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA."},{"name":"Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, Maryland, 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