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Single-cell omics analysis can shed light on endothelial progenitor cells and their potential contribution to PAH pathobiology. We aim to identify endothelial cells that may have stem\/progenitor potential in rat lungs and assess their relevance to PAH. Differential expression, gene set enrichment, cell\u2013cell communication, and trajectory reconstruction analyses were performed on lung endothelial cells from single-cell RNA sequencing of Sugen\u2013hypoxia, monocrotaline, and control rats. Relevance to human PAH was assessed in multiple independent blood and lung transcriptomic data sets. Rat lung endothelial cells were visualized by immunofluorescence in situ, analyzed by flow cytometry, and assessed for tubulogenesis in vitro. A subpopulation of endothelial cells (endothelial arterial type 2 [EA2]) marked by Tm4sf1 (transmembrane 4 L six family member 1), a gene strongly implicated in cancer, harbored a distinct transcriptomic signature enriched for angiogenesis and CXCL12 signaling. Trajectory analysis predicted that EA2 has a less differentiated state compared with other endothelial subpopulations. Analysis of independent data sets revealed that TM4SF1 is downregulated in lungs and endothelial cells from patients and PAH models, is a marker for hematopoietic stem cells, and is upregulated in PAH circulation. TM4SF1+CD31+ rat lung endothelial cells were visualized in distal pulmonary arteries, expressed hematopoietic marker CD45, and formed tubules in coculture with lung fibroblasts. Our study uncovered a novel Tm4sf1-marked subpopulation of rat lung endothelial cells that may have stem\/progenitor potential and demonstrated its relevance to PAH. Future studies are warranted to further elucidate the role of EA2 and Tm4sf1 in PAH.<\/jats:p>","DOI":"10.1165\/rcmb.2022-0020oc","type":"journal-article","created":{"date-parts":[[2022,10,17]],"date-time":"2022-10-17T16:16:01Z","timestamp":1666023361000},"page":"381-394","update-policy":"https:\/\/doi.org\/10.1164\/crossmarkpolicies","source":"Crossref","is-referenced-by-count":16,"title":["<i>Tm4sf1<\/i>\n                    -marked Endothelial Subpopulation Is Dysregulated in Pulmonary Arterial Hypertension"],"prefix":"10.1093","volume":"68","author":[{"given":"Jason","family":"Hong","sequence":"first","affiliation":[{"name":"Division of Pulmonary and Critical Care Medicine"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brenda","family":"Wong","sequence":"additional","affiliation":[{"name":"Division of Pulmonary and Critical Care 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