{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,4]],"date-time":"2026-11-04T03:07:53Z","timestamp":1793761673508,"version":"4.6.1"},"reference-count":80,"publisher":"American Society of Hematology","issue":"22","content-domain":{"domain":["ashpublications.org"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2023,11,28]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>Hemogenic endothelial cells (HECs) are specialized cells that undergo endothelial-to-hematopoietic transition (EHT) to give rise to the earliest precursors of hematopoietic progenitors that will eventually sustain hematopoiesis throughout the lifetime of an organism. Although HECs are thought to be primarily limited to the aorta-gonad-mesonephros (AGM) during early development, EHT has been described in various other hematopoietic organs and embryonic vessels. Though not defined as a hematopoietic organ, the lung houses many resident hematopoietic cells, aids in platelet biogenesis, and is a reservoir for hematopoietic stem and progenitor cells (HSPCs). However, lung HECs have never been described. Here, we demonstrate that the fetal lung is a potential source of HECs that have the functional capacity to undergo EHT to produce de novo HSPCs and their resultant progeny. Explant cultures of murine and human fetal lungs display adherent endothelial cells transitioning into floating hematopoietic cells, accompanied by the gradual loss of an endothelial signature. Flow cytometric and functional assessment of fetal-lung explants showed the production of multipotent HSPCs that expressed the EHT and pre-HSPC markers EPCR, CD41, CD43, and CD44. scRNA-seq and small molecule modulation demonstrated that fetal lung HECs rely on canonical signaling pathways to undergo EHT, including TGF\u03b2\/BMP, Notch, and YAP. Collectively, these data support the possibility that post-AGM development, functional HECs are present in the fetal lung, establishing this location as a potential extramedullary site of de novo hematopoiesis.<\/jats:p>","DOI":"10.1182\/bloodadvances.2022008347","type":"journal-article","created":{"date-parts":[[2023,9,20]],"date-time":"2023-09-20T17:54:31Z","timestamp":1695232471000},"page":"6898-6912","update-policy":"https:\/\/doi.org\/10.1182\/blood.2019cm0000","source":"Crossref","is-referenced-by-count":12,"title":["De novo hematopoiesis from the fetal lung"],"prefix":"10.1182","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9373-7479","authenticated-orcid":false,"given":"Anthony K.","family":"Yeung","sequence":"first","affiliation":[{"name":"1Center for Regenerative Medicine of Boston University and Boston Medical Center, Boston, MA"},{"name":"2Section of Hematology and Medical Oncology, Boston University School of Medicine, Boston, 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