The use of nanoscale topography to modulate the dynamics of adhesion formation in primary osteoblasts and ERK/MAPK signalling in STRO-1+ enriched skeletal stem cells

Biggs, M.J.P., Richards, R.G., Gadegaard, N. , Wilkinson, C.D.W., Oreffo, R.O.C. and Dalby, M.J. (2009) The use of nanoscale topography to modulate the dynamics of adhesion formation in primary osteoblasts and ERK/MAPK signalling in STRO-1+ enriched skeletal stem cells. Biomaterials, 30(28), pp. 5094-5103. (doi:10.1016/j.biomaterials.2009.05.049)

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Abstract

The physiochemical characteristics of a material with in vivo applications are critical for the clinical success of the implant and regulate both cellular adhesion and differentiated cellular function. Topographical modification of an orthopaedic implant may be a viable method to guide tissue integration and has been shown in vitro to dramatically influence osteogenesis, inhibit bone resorption and regulate integrin mediated cell adhesion. Integrins function as force dependant mechanotransducers, acting via the actin cytoskeleton to translate tension applied at the tissue level to changes in cellular function via intricate signalling pathways. In particular the ERK/MAPK signalling cascade is a known regulator of osteospecific differentiation and function. Here we investigate the effects of nanoscale pits and grooves on focal adhesion formation in human osteoblasts (HOBs) and the ERK/MAPK signalling pathway in mesenchymal populations. Nanopit arrays disrupted adhesion formation and cellular spreading in HOBs and impaired osteospecific differentiation in skeletal stem cells. HOBs cultured on 10 µm wide groove/ridge arrays formed significantly less focal adhesions than cells cultured on planar substrates and displayed negligible differentiation along the osteospecific lineage, undergoing up-regulations in the expression of adipospecific genes. Conversely, osteospecific function was correlated to increased integrin mediated adhesion formation and cellular spreading as noted in HOBS cultured on 100 µm wide groove arrays. Here osteospecific differentiation and function was linked to focal adhesion growth and FAK mediated activation of the ERK/MAPK signalling pathway in mesenchymal populations

Item Type:Articles
Keywords:Osteoblasts, mesenchymal stem cells, focal adhesions, nanotopography, ERK/MAPK
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Dalby, Professor Matthew and Wilkinson, Professor Christopher and Gadegaard, Professor Nikolaj
Authors: Biggs, M.J.P., Richards, R.G., Gadegaard, N., Wilkinson, C.D.W., Oreffo, R.O.C., and Dalby, M.J.
Subjects:Q Science > QR Microbiology > QR180 Immunology
Q Science > QR Microbiology
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Biomaterials
ISSN:0142-9612
ISSN (Online):1878-5905
Published Online:21 June 2009

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