Control of non-linear elasticity in F-actin networks with microtubules

Yi-Chia Lin; Gijsje H. Koenderink; Frederick C. MacKintosh; David A. Weitz

doi:10.1039/C0SM00478B

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Soft Matter

Issue 3, 2011

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Control of non-linear elasticity in F-actin networks with microtubules

Yi-Chia Lin , Gijsje H. Koenderink , Frederick C. MacKintosh and David A. Weitz

Soft Matter, 2011,7, 902-906

DOI: 10.1039/C0SM00478B
Received 05 Jun 2010, Accepted 31 Aug 2010
First published on the web 21 Sep 2010

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We measure the elastic properties of composite cytoskeletal networks consisting of cross-linked actin filaments and microtubules. We show that even a small concentration of microtubules leads to dramatic and qualitative changes in the non-linear elastic properties of the actin filament networks. Specifically, we find that microtubules promote non-linear stiffening of F-actin networks because they are much stiffer than actin filaments and therefore suppress non-uniform strain. This finding may be relevant for interpretation of the mechanical behavior of cells, while also suggesting a new way to reinforce the non-linear elasticity of semiflexible polymer materials.

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