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Background: Stromal cell-derived factor-1 (SDF-1) is a chemokine considered to play an important role in the trafficking of hematopoietic stem cells. Given the close relationship between hematopoietic stem cells and endothelial progenitor cells (EPCs), we investigated the effect of SDF-1 on EPC-mediated vasculogenesis.
Methods and results: Flow cytometric analysis demonstrated expression of CXCR4, the receptor of SDF-1, by 66+/-3% of EPCs after 7 days in culture. In vitro modified Boyden chamber assay showed a dose-dependent EPC migration toward SDF-1 (control versus 10 ng/mL SDF-1 versus 100 ng/mL SDF-1, 24+/-2 versus 71+/-3 versus 140+/-6 cells/mm2; P<0.0001). SDF-1 attenuated EPC apoptosis (control versus SDF-1, 27+/-1 versus 7+/-1%; P<0.0001). To investigate the effect of SDF-1 in vivo, we locally injected SDF-1 into athymic ischemic hindlimb muscle of nude mice combined with human EPC transplantation to determine whether SDF-1 augmented EPC-induced vasculogenesis. Fluorescence microscopic examination disclosed increased local accumulation of fluorescence-labeled EPCs in ischemic muscle in the SDF-1 treatment group (control versus SDF-1=241+/-25 versus 445+/-24 cells/mm2, P<0.0001). At day 28 after treatment, ischemic tissue perfusion was improved in the SDF-1 group and capillary density was also increased. (control versus SDF-1, 355+/-26 versus 551+/-30 cells/mm2; P<0.0001).
Conclusion: These findings indicate that locally delivered SDF-1 augments vasculogenesis and subsequently contributes to ischemic neovascularization in vivo by augmenting EPC recruitment in ischemic tissues.
Referred From: https://www.ncbi.nlm.nih.gov/pubmed/12628955
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