Abstract:
:The mechanism by which angiogenic factors recruit bone marrow (BM)-derived quiescent endothelial and hematopoietic stem cells (HSCs) is not known. Here, we report that functional vascular endothelial growth factor receptor-1 (VEGFR1) is expressed on human CD34(+) and mouse Lin(-)Sca-1(+)c-Kit(+) BM-repopulating stem cells, conveying signals for recruitment of HSCs and reconstitution of hematopoiesis. Inhibition of VEGFR1, but not VEGFR2, blocked HSC cell cycling, differentiation and hematopoietic recovery after BM suppression, resulting in the demise of the treated mice. Placental growth factor (PlGF), which signals through VEGFR1, restored early and late phases of hematopoiesis following BM suppression. PlGF enhanced early phases of BM recovery directly through rapid chemotaxis of VEGFR1(+) BM-repopulating and progenitor cells. The late phase of hematopoietic recovery was driven by PlGF-induced upregulation of matrix metalloproteinase-9, mediating the release of soluble Kit ligand. Thus, PlGF promotes recruitment of VEGFR1(+) HSCs from a quiescent to a proliferative BM microenvironment, favoring differentiation, mobilization and reconstitution of hematopoiesis.
journal_name
Nat Medjournal_title
Nature medicineauthors
Hattori K,Heissig B,Wu Y,Dias S,Tejada R,Ferris B,Hicklin DJ,Zhu Z,Bohlen P,Witte L,Hendrikx J,Hackett NR,Crystal RG,Moore MA,Werb Z,Lyden D,Rafii Sdoi
10.1038/nm740keywords:
subject
Has Abstractpub_date
2002-08-01 00:00:00pages
841-9issue
8eissn
1078-8956issn
1546-170Xpii
nm740journal_volume
8pub_type
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