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Updated: Jul 16, 2026

In Vitro Reconstitution of the Actin Cytoskeleton Inside Giant Unilamellar Vesicles
Published on: August 25, 2022
Elastic behavior of cross-linked and bundled actin networks
M L Gardel1, J H Shin, F C MacKintosh
1Department of Physics, Harvard University, Cambridge, MA 02138, USA.
Abstract:
Networks of cross-linked and bundled actin filaments are ubiquitous in the cellular cytoskeleton, but their elasticity remains poorly understood. We show that these networks exhibit exceptional elastic behavior that reflects the mechanical properties of individual filaments. There are two distinct regimes of elasticity, one reflecting bending of single filaments and a second reflecting stretching of entropic fluctuations of filament length. The mechanical stiffness can vary by several decades with small changes in cross-link concentration, and can increase markedly upon application of external stress. We parameterize the full range of behavior in a state diagram and elucidate its origin with a robust model.
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