Tissue neovascularization involves recruitment of circulating endothelial progenitor cells that originate in the bone marrow. Here, we show that a class of embryonic endothelial progenitor cells (Tie-2+, c-Kit+, Sca-1+, and Flk-1−/low), which were isolated at E7.5 of mouse development at the onset of vasculogenesis, retain their ability to contribute to tumor angiogenesis in the adult. Using intravital fluorescence videomicroscopy, we further defined the multistep process of embryonic endothelial progenitor cell (eEPC) homing and incorporation. Circulating eEPCs are specifically arrested in “hot spots” within the tumor microvasculature, extravasate into the interstitium, form multicellular clusters, and incorporate into functional vascular networks. Expression analysis and in vivo blocking experiments provide evidence that the initial cell arrest of eEPC homing is mediated by E- and P-selectin and P-selectin glycoprotein ligand 1. This paper provides the first in vivo insights into the mechanisms of endothelial progenitor cell recruitment and, thus, indicates novel ways to interfere with pathological neovascularization.
Multistep Nature of Microvascular Recruitment of Ex Vivo–expanded Embryonic Endothelial Progenitor Cells during Tumor Angiogenesis
P. Vajkoczy,S. Blum,M. Lamparter,R. Mailhammer,R. Erber,B. Engelhardt,D. Vestweber,A. Hatzopoulos
Published 2003 in Journal of Experimental Medicine
ABSTRACT
PUBLICATION RECORD
- Publication year
2003
- Venue
Journal of Experimental Medicine
- Publication date
2003-06-16
- Fields of study
Biology, Medicine
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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