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Polymer-free immobilization of a cyclic RGD peptide on a nitinol stent promotes integrin-dependent endothelial coverage of strut surfaces.
- Source :
-
Journal of biomedical materials research. Part B, Applied biomaterials [J Biomed Mater Res B Appl Biomater] 2012 Apr; Vol. 100 (3), pp. 637-45. Date of Electronic Publication: 2012 Jan 25. - Publication Year :
- 2012
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Abstract
- This study examined the utility of a stabilized cyclic RGD peptide chemically modified to selectively bind to titanium-oxide for enhanced biocompatibility of self-expanding nitinol stents. Endothelial cells express integrin receptors that promote attachment to subendothelial matrix proteins. Integrin binding to arginine-glycine-aspartic acid (RGD) peptide derivatives mimic naturally occurring adherent interactions. Irreversible covalent surface coating of conventional nitinol stents with a cyclic RGD (cRGD) peptide highly specific for integrin alpha v beta 3 might foster endothelialization after stent implantation. A selective cRGD peptide was irreversibly immobilized onto titanium oxide-rich nitinol coupons or self-expanding stents. Functionality of the engrafted RGD peptide was demonstrated using in vitro endothelial bioassays. A subsequent 7-day in vivo endothelialization study was performed using cRGD-coated self-expanding nitinol stents in rabbits. cRGD peptide coating effectively promoted endothelial cell anchorage, migration, and proliferation confirmed by increased focal adhesions. Proof-of-concept studies of rabbit cRGD stent implants showed a significant increase in endothelial coverage above stent struts relative to stents coated with BSA (cRGD = 70.1 ± 21.9 vs. BSA = 49.9 ± 21.8%, p < 0.03). Immobilization of cRGD peptides on strut surfaces represents an innovative strategy to improve endothelialization, which may facilitate vascular healing after stent implantation.<br /> (Copyright © 2012 Wiley Periodicals, Inc.)
Details
- Language :
- English
- ISSN :
- 1552-4981
- Volume :
- 100
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- Journal of biomedical materials research. Part B, Applied biomaterials
- Publication Type :
- Academic Journal
- Accession number :
- 22278946
- Full Text :
- https://doi.org/10.1002/jbm.b.31988