Cell-Cycle Control by Physiological Matrix Elasticity and In Vivo Tissue Stiffening

Eric A. Klein, Liqun Yin, Devashish Kothapalli, Paola Castagnino, Fitzroy J. Byfield, Tina Xu, Ilya Levental, Elizabeth Hawthorne, Paul A. Janmey, Richard K. Assoian

Research output: Contribution to journalArticlepeer-review

270 Scopus citations


Background: A number of adhesion-mediated signaling pathways and cell-cycle events have been identified that regulate cell proliferation, yet studies to date have been unable to determine which of these pathways control mitogenesis in response to physiologically relevant changes in tissue elasticity. In this report, we use hydrogel-based substrata matched to biological tissue stiffness to investigate the effects of matrix elasticity on the cell cycle. Results: We find that physiological tissue stiffness acts as a cell-cycle inhibitor in mammary epithelial cells and vascular smooth muscle cells; subcellular analysis in these cells, mouse embryonic fibroblasts, and osteoblasts shows that cell-cycle control by matrix stiffness is widely conserved. Remarkably, most mitogenic events previously documented as extracellular matrix (ECM)/integrin-dependent proceed normally when matrix stiffness is altered in the range that controls mitogenesis. These include ERK activity, immediate-early gene expression, and cdk inhibitor expression. In contrast, FAK-dependent Rac activation, Rac-dependent cyclin D1 gene induction, and cyclin D1-dependent Rb phosphorylation are strongly inhibited at physiological tissue stiffness and rescued when the matrix is stiffened in vitro. Importantly, the combined use of atomic force microscopy and fluorescence imaging in mice shows that comparable increases in tissue stiffness occur at sites of cell proliferation in vivo. Conclusions: Matrix remodeling associated with pathogenesis is in itself a positive regulator of the cell cycle through a highly selective effect on integrin-dependent signaling to FAK, Rac, and cyclin D1.

Original languageEnglish (US)
Pages (from-to)1511-1518
Number of pages8
JournalCurrent Biology
Issue number18
StatePublished - Sep 29 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)




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