Abstract
Postnatal vasculogenesis is mediated by endothelial progenitor cells (EPCs) which consist of subpopulations with different functional capacities. Our goal was to profile chemokine receptor expression on relevant subsets of EPCs and to characterize their role for effector functions. CD34+/CD133+/VEGFR2+ EPCs were characterized by high expression of chemokine receptors CXCR4, CX3CR1, BLT1, and low level expression of CXCR2 and CCR2, while primordial CD34−/CD133+/VEGFR2+ EPCs express these chemokine receptors at comparably low levels. Migration assays revealed that SDF-1, fractalkine, and LTB4 significantly increase migration of CD34−/CD133+/VEGFR2+ EPCs, while SDF-1 was the only potent agonist of migration of CD34+/CD133+/VEGFR2+ EPCs. SDF-1, fractalkine, and LTB4 trigger significant increase adhesion of CD34+/CD133+/VEGFR2+ EPCs, while in CD34−/CD133+/VEGFR2+ EPCs SDF-1 and fractalkine are equipotent agonists and LTB4 triggers a smaller though still significant increase in adhesion. Differential expression of specific chemokine receptors is an important regulator in terms of migration and adhesion of biologically relevant EPC-subpopulations, which may have implications for cell therapeutic strategies for treatment of ischemic vascular disease.
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Acknowledgments
This study was supported by the Deutsche Forschungsgemeinschaft (KFO 196) and a HOMFOR grant of the University of the Saarland. The excellent technical work of Claudia Schormann is greatly appreciated.
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395_2010_142_MOESM1_ESM.pdf
Supplemental Fig. 1. CD34–/CD133+/VEGFR-2+ progenitor cells are precursors of CD34+/CD133+/VEGFR-2+ EPC. Peripheral blood mononuclear cells were isolated from healthy human volunteers by density gradient centrifugation. CD133+ cells were bead-purified and stained with the indicated fluorescently tagged antibodies or the corresponding isotype-matched control (IC) for FACS analysis. Importantly, both, CD34−/CD133+ and the CD34+/CD133+ EPC-subsets are characterized by expression of VEGFR2. (PDF 26 kb)
395_2010_142_MOESM2_ESM.pdf
Supplemental Fig. 2. Representative FACS analysis of propidium iodide/annexin V staining of CD34–/CD133+/VEGFR-2+ EPCs. Propidium iodide− and AnnexinV− negative cell are viable cells (bottom left), Propidium iodide+and AnnexinV+ show dead cells and propidium iodide− and AnnexinV+ represent apoptotic cells. (PDF 686 kb)
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Walenta, K.L.H., Bettink, S., Böhm, M. et al. Differential chemokine receptor expression regulates functional specialization of endothelial progenitor cell subpopulations. Basic Res Cardiol 106, 299–305 (2011). https://doi.org/10.1007/s00395-010-0142-z
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DOI: https://doi.org/10.1007/s00395-010-0142-z