2010 Volume No 19 – pages 205-213
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Title: Bacterial biofilm formation versus mammalian cell growth on titanium-based mono- and bi-functional coating |
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Author: G Subbiahdoss, B Pidhatika, G Coullerez, M Charnley, R Kuijer, HC van der Mei, M Textor, HJ Busscher |
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Address:Department of Biomedical Engineering, University Medical Center Groningen and University of Groningen, P.O. Box 196, 9700 AD Groningen, The Netherlands |
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E-mail: h.c.van.der.mei at med.umcg.nl |
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Key Words: Biomaterials-associated infections, polymer brush, polyethylene glycol brush coating, U2OS osteoblast, Staphylococcus epidermidis, biofilm, tissue integration, non-adhesive fouling. |
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Publication date: May 13th 2010 |
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Abstract: Biomaterials-associated-infections (BAI) are serious complications in modern medicine. Although non-adhesive coatings, like polymer-brush coatings, have been shown to prevent bacterial adhesion, they do not support cell growth. Bi-functional coatings are supposed to prevent biofilm formation while supporting tissue integration. Here, bacterial and cellular responses to poly(ethylene glycol) (PEG) brush-coatings on titanium oxide presenting the integrin-active peptide RGD (arginine-glycine-aspartic acid) (bioactive “PEG-RGD”) were compared to mono-functional PEG brush-coatings (biopassive “PEG”) and bare titanium oxide (TiO2) surfaces under flow. Staphylococcus epidermidis ATCC 35983 was deposited on the surfaces under a shear rate of 11 s-1 for 2 h followed by seeding of U2OS osteoblasts. Subsequently, both S. epidermidis and U2OS cells were grown simultaneously on the surfaces for 48 h under low shear (0.14 s-1). After 2 h, staphylococcal adhesion was reduced to 3.6±1.8 × 103 and 6.0±3.9 × 103 cm-2 on PEG and PEG-RGD coatings respectively, compared to 1.3±0.4 × 105 cm-2 for the TiO2 surface. When allowed to grow for 48 h, biofilms formed on all surfaces. However, biofilms detached from the PEG and PEG-RGD coatings when exposed to an elevated shear (5.6 s-1) U2OS cells neither adhered nor spread on PEG brush-coatings, regardless of the presence of biofilm. In contrast, in the presence of biofilm, U2OS cells adhered and spread on PEG-RGD coatings with a significantly higher surface coverage than on bare TiO2. The detachment of biofilm and the high cell surface coverage revealed the potential significance of PEG-RGD coatings in the context of the “race for the surface” between bacteria and mammalian cells. |
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Article download: Pages
205-213 (PDF file) |
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