Collagen/heparin coating on titanium surface improves the biocompatibility of titanium applied as a blood-contacting biomaterial

Journal of Biomedical Materials Research. Part a
Jia-Long ChenNan Huang

Abstract

Thrombosis and restenosis are the main causes leading to failure of cardiovascular and other blood-contacting biomedical devices. It is recognized that rapid re-endothelialization is a promising method for preventing these complications. This article deals with improving the endothelial progenitor cell (EPC) compatibility and hemocompatibility of titanium by coating an extracellular matrix-like film with heparin(hep) and collagen(col) by a layer-by-layer (LBL) self-assembly technique. In the work described here, LBL-produced col/hep coating growth is initialized by deposition of a layer of poly-L-lysine on a titanium surface, which is negatively charged after treatment with NaOH, followed by formation of a multilayer film formed by alternating deposition of negatively charged heparin and positively charged collagen using electrostatic interaction. The X-ray photoelectron spectroscopy results and fluorescence staining of collagen show that collagen is predominant on the surface and that collagen interpenetrates the heparin layer. In vitro EPC attachment and proliferation increase greatly on the col/hep coating. Immunofluorescent staining of cytoskeleton actin reveals that cells on the col/hep coating form a compact confluent cel...Continue Reading

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Citations

Mar 9, 2013·Journal of Materials Science. Materials in Medicine·M MartinesiF Borgioli
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