Biomimetic modification of titanium dental implant model surfaces using the RGDSP-peptide sequence: a cell morphology study.
Surface topography and (bio)chemistry are key factors in determining cell response to an implant. We investigated cell adhesion and spreading patterns of epithelial cells, fibroblasts and osteoblasts on biomimetically modified, smooth and rough titanium surfaces. The RGD bioactive peptide sequence was immobilized via a non-fouling poly(L-lysine)-graft-poly(ethylene glycol) (PLL-g-PEG) molecular assembly system, which allowed exploitation of specific cell-peptide interactions even in the presence of serum. As control surfaces, bare titanium and bio-inactive surfaces (scrambled RDG and unfunctionalized PLL-g-PEG) were used. Our findings demonstrated that surface topography and chemistry directly influenced the attachment and morphology of all cell types tested. In general, an increase in cell number and more spread cells were observed on bioactive substrates (containing RGD) compared to bio-inactive surfaces. More fibroblasts were present on smooth than on rough topographies, whereas for osteoblasts the opposite tendency was observed. Epithelial cell attachment did not follow any regular pattern. Footprint areas for all cell types were significantly reduced on rough compared to smooth surfaces. Osteoblast attachment and footprint areas increased with increasing RGD-peptide surface density. However, no synergy (interaction) between RGD-peptide surface density and surface topography was observed for osteoblasts neither in terms of attachment nor footprint area.
Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland.
Martin
M
Schuler
Gethin Rh
GR
Owen
Douglas W
DW
Hamilton
Michael
M
de Wild
Marcus
M
Textor
Donald M
DM
Brunette
Samuele G P
SG
Tosatti
D000818:Animals; D000831:Animals, Newborn; D041702:BALB 3T3 Cells; D040761:Biomimetic Materials / Q000032:analysis / Q000737:chemistry*; D002448:Cell Adhesion / Q000187:drug effects; D048429:Cell Size / Q000187:drug effects; D002478:Cells, Cultured; D020099:Coated Materials, Biocompatible / Q000032:analysis / Q000737:chemistry / Q000494:pharmacology; D015921:Dental Implants; D051379:Mice; D009842:Oligopeptides / Q000737:chemistry* / Q000494:pharmacology*; D010006:Osteoblasts / Q000166:cytology* / Q000187:drug effects*; D011485:Protein Binding; D051381:Rats; D013499:Surface Properties; D013552:Swine; D014025:Titanium / Q000737:chemistry*
D020099:Coated Materials, Biocompatible; D015921:Dental Implants; D009842:Oligopeptides; C046617:arginyl-glycyl-aspartyl-serine; D014025:Titanium