Dynamics of Tissue-Induced Alignment of Fibrous Extracellular Matrix

Alexandra S. Piotrowski-Daspit, Bryan A. Nerger, Abraham E. Wolf, Sankaran Sundaresan, Celeste M. Nelson

Research output: Contribution to journalArticlepeer-review

40 Scopus citations


Aligned fibers of extracellular matrix (ECM) affect the direction, efficiency, and persistence of migrating cells. To uncover the mechanisms by which multicellular tissues align their surrounding ECM before migration, we used an engineered three-dimensional culture model to investigate the dynamics of ECM alignment around tissues of defined geometry. Analysis of ECM alignment over time revealed that tissues rapidly reorganize their surrounding matrix, with a characteristic time that depends on the type of cell and the initial tissue geometry. We found that matrix metalloproteinase activity is not required for matrix alignment before cell migration. Instead, alignment is driven by Rho-mediated cytoskeletal contractility and accelerated by propagation of tension through intercellular adhesions. Our data suggest that multicellular tissues align their surrounding matrix by pulling collectively to exert strain, which is primarily a physical process. Consistently, the pattern of matrix alignment depends on tissue geometry and the resulting distribution of mechanical strain, with asymmetric tissues generating a higher degree of matrix alignment along their longest axes. The rapid ability of multicellular tissues to physically remodel their matrix enables their constituent cells to migrate efficiently along aligned fibers and to quickly change their direction according to other microenvironmental cues, which is important for both normal and disease processes.

Original languageEnglish (US)
Pages (from-to)702-713
Number of pages12
JournalBiophysical Journal
Issue number3
StatePublished - Aug 8 2017

All Science Journal Classification (ASJC) codes

  • Biophysics


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