VEGFR2+PDGFRbeta+ circulating precursor cells participate in capillary restoration after hyperoxia acute lung injury (HALI).
The in vivo morphology and phenotype of circulating cells that spontaneously contribute to new vessel formation in adults remain unclear. Here, we use high-resolution imaging and flow cytometry to characterize the morphology and phenotype of a distinct population of circulating mononuclear cells contributing to spontaneous new vessel formation after hyperoxia acute lung injury (HALI). We identify a subpopulation of myeloid (CD11b/Mac1(+)) haematopoietic cells co-expressing vascular endothelial growth factor receptor 2 (VEGFR2) and platelet derived growth factor receptor beta (PDGFRbeta). Moreover, we show that these CD11b(+)VEGFR2(+)PDGFRbeta(+) circulating precursor cells (CPCs) contribute structurally to the luminal surface of capillaries re-forming 2 weeks post-HALI. This indicates that these myeloid CPCs may function, at least transiently, as putative vascular precursors, and has important implications for capillary growth and repair in injury and in pathologies of the lung and other organs.
Department of Anesthesia and Critical Care, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA.
Rosemary
R
Jones
Diane E
DE
Capen
Margaretha
M
Jacobson
Kenneth S
KS
Cohen
David T
DT
Scadden
Dan G
DG
Duda
D055371:Acute Lung Injury / Q000473:pathology*; D000818:Animals; D039481:CD11b Antigen / Q000096:biosynthesis; D002196:Capillaries / Q000473:pathology*; D005434:Flow Cytometry / Q000379:methods; D018496:Hyperoxia / Q000473:pathology*; D007150:Immunohistochemistry / Q000379:methods; D007700:Kinetics; D008168:Lung / Q000473:pathology; D008297:Male; D010641:Phenotype; D051381:Rats; D017207:Rats, Sprague-Dawley; D020797:Receptor, Platelet-Derived Growth Factor beta / Q000096:biosynthesis*; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000096:biosynthesis*
D039481:CD11b Antigen; D020797:Receptor, Platelet-Derived Growth Factor beta; D040301:Vascular Endothelial Growth Factor Receptor-2