Departmental Papers (BE)

Document Type

Journal Article

Date of this Version

November 2008

Abstract

The ability of stem cells to differentiate into specified lineages in the appropriate locations is vital to morphogenesis and adult tissue regeneration. Although soluble signals are important regulators of patterned differentiation, here we show that gradients of mechanical forces can also drive patterning of lineages. In the presence of soluble factors permitting osteogenic and adipogenic differentiation, human mesenchymal stem cells at the edge of multicellular islands differentiate into the osteogenic lineage, whereas those in the center became adipocytes. Interestingly, changing the shape of the multicellular sheet modulated the locations of osteogenic versus adipogenic differentiation. Measuring traction forces revealed gradients of stress that preceded and mirrored the patterns of differentiation, where regions of high stress resulted in osteogenesis, whereas stem cells in regions of low stress differentiated to adipocytes. Inhibiting cytoskeletal tension suppressed the relative degree of osteogenesis versus adipogenesis, and this spatial patterning of differentiation was also present in three-dimensional multicellular clusters. These findings demonstrate a role for mechanical forces in linking multicellular organization to spatial differentials of cell differentiation, and they represent an important guiding principle in tissue patterning that could be exploited in stem cell-based therapies.

Comments

Copyright The Authors. Published in Stem Cells, Volume 26, Issue 11, November 2008, pages 2921-2927.
Publisher URL: http://stemcells.alphamedpress.org/cgi/content/abstract/26/11/2921

Keywords

mesenchymal stem cells, differentiation, three-dimensional, patterning

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Date Posted: 11 December 2008

This document has been peer reviewed.