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The effect of equiaxial stretching on the osteogenic differentiation and mechanical properties of human adipose stem cells.

Abstract：

:Although mechanical cues are known to affect stem cell fate and mechanobiology, the significance of such stimuli on the osteogenic differentiation of human adipose stem cells (hASCs) remains unclear. In this study, we investigated the effect of long-term mechanical stimulation on the attachment, osteogenic differentiation and mechanical properties of hASCs. Tailor-made, pneumatic cell stretching devices were used to expose hASCs to cyclic equiaxial stretching in osteogenic medium. Cell attachment and focal adhesions were visualised using immunocytochemical vinculin staining on days 3 and 6, and the proliferation and alkaline phosphatase activity, as a sign of early osteogenic differentiation, were analysed on days 0, 6 and 10. Furthermore, the mechanical properties of hASCs, in terms of apparent Young's modulus and normalised contractility, were obtained using a combination of atomic force microscopy based indentation and computational approaches. Our results indicated that cyclic equiaxial stretching delayed proliferation and promoted osteogenic differentiation of hASCs. Stretching also reduced cell size and intensified focal adhesions and actin cytoskeleton. Moreover, cell stiffening was observed during osteogenic differentiation and especially under mechanical stimulation. These results suggest that cyclic equiaxial stretching modifies cell morphology, focal adhesion formation and mechanical properties of hASCs. This could be exploited to enhance osteogenic differentiation.

journal_name

J Mech Behav Biomed Mater

journal_title

Journal of the mechanical behavior of biomedical materials

authors

Virjula S,Zhao F,Leivo J,Vanhatupa S,Kreutzer J,Vaughan TJ,Honkala AM,Viehrig M,Mullen CA,Kallio P,McNamara LM,Miettinen S

doi

10.1016/j.jmbbm.2017.04.016

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

38-48

eissn

1751-6161

issn

1878-0180

pii

S1751-6161(17)30169-8

journal_volume

72

pub_type

杂志文章

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