Fracture induced mobilization and incorporation of bone marrow-derived endothelial progenitor cells for bone healing

Journal of Cellular Physiology
Tomoyuki MatsumotoTakayuki Asahara

Abstract

We recently reported that systemic administration of peripheral blood (PB) CD34+ cells, an endothelial progenitor cell (EPC)-enriched population, contributed to fracture healing via vasculogenesis/angiogenesis. However, pathophysiological role of EPCs in fracture healing process has not been fully clarified. Therefore, we investigated the hypothesis whether mobilization and incorporation of bone marrow (BM)-derived EPCs may play a pivotal role in appropriate fracture healing. Serial examinations of Laser doppler perfusion imaging and histological capillary density revealed that neovascularization activity at the fracture site peaked at day 7 post-fracture, the early phase of endochondral ossifification. Fluorescence-activated cell sorting (FACS) analysis demonstrated that the frequency of BM cKit+Sca1+Lineage- (Lin-) cells and PB Sca1+Lin- cells, which are EPC-enriched fractions, significantly increased post-fracture. The Sca1+ EPC-derived vasuculogenesis at the fracture site was confirmed by double immunohistochemistry for CD31 and Sca1. BM transplantation from transgenic donors expressing LacZ transcriptionally regulated by endothelial cell-specific Tie-2 promoter into wild type also provided direct evidence that EPCs contrib...Continue Reading

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