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• W2021083962 abstract "Adhesion and spreading of cells on biomaterials are integrin-mediated processes. But recent findings indicate a key role of the cell membrane associated matrix substance hyaluronan (HA) in interface interactions. Because HA is a negatively charged molecule we assume that a biomaterial surface with an opposed charge could boost the first contact of the cell to the surface. Polished cp titanium (Ra = 0.19 μm) was coated with an amino-group containing plasma polymer (Ti PPA). For this purpose, a microwave excited, pulsed, low-pressure plasma was used. Additionally, collagen was immobilized on Ti PPA with polyethylene glycol diacid (PEG-DA), catalyzed by carbodiimide (CDI). The physico-chemical surface analytical techniques like XPS, FT-IR, water contact angle and zeta-potential verified the retention of the allylamine precursor structure. Human osteoblasts were cultured in serum-free Dulbecco's modified Eagle medium (DMEM). Adhesion and cell cycle phases were calculated by flow cytometry. Spreading and actin cytoskeleton were visualized by confocal microscopy. Gene expression of osteogenic markers was detected by real-time RT-PCR. Ti PPA is significantly advantageous concerning initial adhesion and spreading during the first hours of the cell contact to the surface. The proliferation of osteoblasts is positively influenced. Gene expression of the differentiation marker bone sialoprotein was upregulated after 24 h. Our results demonstrate that functionalization of titanium with positively charged amino-groups is sufficiently enough to significantly improve initial steps of the cellular contact to the material surface." @default.
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• W2021083962 date "2007-11-01" @default.
• W2021083962 modified "2023-10-03" @default.
• W2021083962 title "Improved initial osteoblast functions on amino-functionalized titanium surfaces" @default.
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• W2021083962 doi "https://doi.org/10.1016/j.bioeng.2007.07.004" @default.
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