Abstract
The restoration of a damaged endothelium might be a fascinating way to reduce significantly late-thrombosis and restenosis in the stent treatment. It has been recently reported that the recruitment of endothelial progenitor cells (EPCs), capable for repairing a damaged endothelium, can be important in the vascular stent application. Therefore, we focused on the hypothesis that stromal cell-derived factor-1α (SDF-1α) acts as a key chemokine for the mobilization and recruitment of EPCs to the damaged endothelium lesion. In this study, the effect of SDF-1α released from a cobalt-chromium alloy (Co-Cr) plate, vascular stent material, was investigated on the recruitment of EPCs in vitro. Dopamine-conjugated heparin was synthesized to introduce heparin onto Co-Cr. Heparin-coated Co-Cr surfaces were examined by water contact angle and attenuated total reflectance-Fourier transform infrared (ATRFTIR) to prove successful coating of heparin. Finally, SDF-1α was bound to the coated heparin derivative. Amounts of loaded and released SDF-1α were measured by ELISA, and the recruited EPC by released SDF-1α was evaluated using two different migration assays. The quantity of SDF-1α bound to the heparin-modified surface increased in a concentration-dependent manner and SDF-1α was released over 28 days. Transwell migration assay revealed that soluble SDF-1α released from the heparin-coated Co-Cr induced significantly more EPC recruitment than bare Co-Cr and heparin-coated Co-Cr. More importantly, fibrin gel migration assay further demonstrated that EPCs evidently respond to heparin-based substrate with SDF-1α and this type of behaviors was surprisingly found at as low level as less 1 ng/day of SDF-1α. These results are strongly encouraging for further in vitro and in vivo studies.
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Kang, S.N., Park, C., Kim, S.M. et al. Effect of stromal cell derived factor-1α release from heparin-coated Co-Cr stent substrate on the recruitment of endothelial progenitor cells. Macromol. Res. 23, 1159–1167 (2015). https://doi.org/10.1007/s13233-015-4002-z
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DOI: https://doi.org/10.1007/s13233-015-4002-z