Volume 102, Issue 7 pp. 1462-1472
Original Report

Osteogenic differentiation on DLC-PDMS-h surface

Antti Soininen

Corresponding Author

Antti Soininen

ORTON Research Institute, Helsinki, Finland

ORTON Orthopedic Hospital, Helsinki, Finland

Correspondence to: A. Soininen (e-mail: [email protected])Search for more papers by this author
Emilia Kaivosoja

Emilia Kaivosoja

Department of Medicine, Institute of Clinical Medicine, Biomedicum, Helsinki, Finland

Department of Electrical Engineering and Automation, Aalto University, Finland

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Tarvo Sillat

Tarvo Sillat

Department of Medicine, Institute of Clinical Medicine, Biomedicum, Helsinki, Finland

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Sannakaisa Virtanen

Sannakaisa Virtanen

University of Erlangen Nuremberg, Nuremberg, Germany

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Yrjö T. Konttinen

Yrjö T. Konttinen

ORTON Research Institute, Helsinki, Finland

ORTON Orthopedic Hospital, Helsinki, Finland

Department of Medicine, Institute of Clinical Medicine, Biomedicum, Helsinki, Finland

COXA Hospital for Joint Replacement, Tampere, Finland

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Veli-Matti Tiainen

Veli-Matti Tiainen

ORTON Research Institute, Helsinki, Finland

ORTON Orthopedic Hospital, Helsinki, Finland

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First published: 27 February 2014
Citations: 3

Abstract

The hypothesis was that anti-fouling diamond-like carbon polydimethylsiloxane hybrid (DLC-PDMS-h) surface impairs early and late cellular adhesion and matrix–cell interactions. The effect of hybrid surface on cellular adhesion and cytoskeletal organization, important for osteogenesis of human mesenchymal stromal cells (hMSC), where therefore compared with plain DLC and titanium (Ti). hMSCs were induced to osteogenesis and followed over time using scanning electron microscopy (SEM), time-of-flight secondary ion mass spectrometry (ToF-SIMS), immunofluorescence staining, quantitative real-time polymerase chain reaction (qRT-PCR), and hydroxyapatite (HA) staining. SEM at 7.5 hours showed that initial adherence and spreading of hMSC was poor on DLC-PDMS-h. At 5 days some hMSC were undergoing condensation and apoptotic fragmentation, whereas cells on DLC and Ti grew well. DAPI–actin–vinculin triple staining disclosed dwarfed cells with poorly organized actin cytoskeleton-focal complex/adhesion-growth substrate attachments on hybrid coating, whereas spread cells, organized microfilament bundles, and focal adhesions were seen on DLC and in particular on Ti. Accordingly, at day one ToF-SIMS mass peaks showed poor protein adhesion to DLC-PDMS-h compared with DLC and Ti. COL1A1, ALP, OP mRNA levels at days 0, 7, 14, 21, and/or 28 and lack of HA deposition at day 28 demonstrated delayed or failed osteogenesis on DLC-PDMS-h. Anti-fouling DLC-PDMS-h is a poor cell adhesion substrate during the early protein adsorption-dependent phase and extracellular matrix-dependent late phase. Accordingly, some hMSCs underwent anoikis-type apoptosis and failed to complete osteogenesis, due to few focal adhesions and poor cell-to-ECM contacts. DLC-PDMS-h seems to be a suitable coating for non-integrating implants/devices designed for temporary use. © 2014 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 102B: 1462–1472, 2014.

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