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Synergistic Control of Mesenchymal Stem Cell Differentiation by Nanoscale Surface Geometry and Immobilized Growth Factors on TiO 2 Nanotubes
Author(s) -
Park Jung,
Bauer Sebastian,
Pittrof Andreas,
Killian Manuela S.,
Schmuki Patrik,
von der Mark Klaus
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201100790
Subject(s) - mesenchymal stem cell , chondrogenesis , materials science , nanotechnology , nanoscopic scale , cellular differentiation , biophysics , bone morphogenetic protein 2 , chemistry , microbiology and biotechnology , in vitro , biochemistry , biology , gene
Abstract The aim of this study is to elucidate whether combined environmental signals provided by nanoscale topography and by growth factors control cell behavior of mesenchymal stem cells (MSCs) in a synergistic or simply additive manner. Chondrogenic and osteogenic differentiation of MSCs is studied on vertically aligned TiO 2 nanotubes of size 15 and 100 nm with and without immobilized bone morphogenetic protein‐2 (BMP‐2). Although BMP‐2 coating stimulates both chondrogenic and osteogenic differentiation of MSCs, the response strongly depends on the surface nanoscale geometry of the BMP‐2‐coated nanotubes. Chondrogenic differentiation is strongly supported on 100 nm BMP‐2‐coated nanotubes, but not on 15 nm nanotubes, which induce spreading and de‐differentiation of chondrocytes. A similar response is observed with primary chondrocytes, which maintain their chondrogenic phenotype on BMP‐2‐coated 100 nm nanotubes, but de‐differentiate on 15 nm nanotubes. In contrast, osteogenic differentiation is greatly enhanced on 15 nm but not on 100 nm BMP‐2‐coated nanotubes as shown previously. Furthermore, covalent immobilization of BMP‐2 rescues MSCs from apoptosis occurring on uncoated 100 nm TiO 2 nanotube surfaces. Thus, combined signals provided by BMP‐2 immobilized to a defined lateral nanoscale spacing geometry seem to contain environmental cues that are able to modulate a lineage‐specific decision of MSC differentiation and cell survival in a synergistic manner.