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Title: Bacterial adhesion and osteoblast function on titanium with surface-grafted chitosan and immobilized RGD peptide
Authors: Shi, Z. 
Neoh, K.G. 
Kang, E.T. 
Poh, C.
Wang, W.
Keywords: Bacterial adhesion
Titanium alloy
Issue Date: 15-Sep-2008
Citation: Shi, Z., Neoh, K.G., Kang, E.T., Poh, C., Wang, W. (2008-09-15). Bacterial adhesion and osteoblast function on titanium with surface-grafted chitosan and immobilized RGD peptide. Journal of Biomedical Materials Research - Part A 86 (4) : 865-872. ScholarBank@NUS Repository.
Abstract: Biomaterials-associated infections remain a source of serious complications in modern medicine. When a biomaterial is implanted in the body, the result of successful tissue integration or implant infection depends on the race for the surface between bacteria and tissue cells. One promising strategy to reduce the incidence of infection is the functionalization of the biomaterial surface to inhibit bacterial adhesion and encourage the growth of cells. In this in vitro study, the surface of titanium alloy substrates was first functionalized by covalently grafted chitosan (CS). The cell-adhesive Arg-Gly-Asp (RGD) peptide was then immobilized on the CS-grafted surface through covalent binding of peptide to the free NH2 groups of CS. Both these functionalized surfaces showed a decrease in adhesion of Staphylococcus aureus (S. aureus) and Staphylococcus epidermidis (S. epidermidis) compared with the pristine substrate. A significant increase in osteoblast cell attachment, proliferation, and alkaline phosphatase activity was observed on the surface with the immobilized Arg-Gly-Asp peptide. Thus, utilizing surface-grafted chitosan in conjunction with the cell-adhesive peptide to modify the metal surface provides a promising means for enhancing tissue integration of implants by reducing bacterial adhesion and promoting osteoblast functions. © 2007 Wiley Periodicals, Inc.
Source Title: Journal of Biomedical Materials Research - Part A
ISSN: 15493296
DOI: 10.1002/jbm.a.31648
Appears in Collections:Staff Publications

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