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  • Title: Role of beta2-integrins for homing and neovascularization capacity of endothelial progenitor cells.
    Author: Chavakis E, Aicher A, Heeschen C, Sasaki K, Kaiser R, El Makhfi N, Urbich C, Peters T, Scharffetter-Kochanek K, Zeiher AM, Chavakis T, Dimmeler S.
    Journal: J Exp Med; 2005 Jan 03; 201(1):63-72. PubMed ID: 15623573.
    Abstract:
    The mechanisms of homing of endothelial progenitor cells (EPCs) to sites of ischemia are unclear. Here, we demonstrate that ex vivo-expanded EPCs as well as murine hematopoietic Sca-1+/Lin- progenitor cells express beta2-integrins, which mediate the adhesion of EPCs to endothelial cell monolayers and their chemokine-induced transendothelial migration in vitro. In a murine model of hind limb ischemia, Sca-1+/Lin- hematopoietic progenitor cells from beta2-integrin-deficient mice are less capable of homing to sites of ischemia and of improving neovascularization. Preactivation of the beta2-integrins expressed on EPCs by activating antibodies augments the EPC-induced neovascularization in vivo. These results provide evidence for a novel function of beta2-integrins in postnatal vasculogenesis.
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