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Unbiased pattern analysis reveals highly diverse responses of cytoskeletal systems to cyclic straining

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  • Ronald Springer
  • Alexander Zielinski
  • Catharina Pleschka
  • Bernd Hoffmann
  • Rudolf Merkel

Abstract

In mammalian cells, actin, microtubules, and various types of cytoplasmic intermediate filaments respond to external stretching. Here, we investigated the underlying processes in endothelial cells plated on soft substrates from silicone elastomer. After cyclic stretch (0.13 Hz, 14% strain amplitude) for periods ranging from 5 min to 8 h, cells were fixed and double-stained for microtubules and either actin or vimentin. Cell images were analyzed by a two-step routine. In the first step, micrographs were segmented for potential fibrous structures. In the second step, the resulting binary masks were auto- or cross-correlated. Autocorrelation of segmented images provided a sensitive and objective measure of orientational and translational order of the different cytoskeletal systems. Aligning of correlograms from individual cells removed the influence of only partial alignment between cells and enabled determination of intrinsic cytoskeletal order. We found that cyclic stretching affected the actin cytoskeleton most, microtubules less, and vimentin mostly only via reorientation of the whole cell. Pharmacological disruption of microtubules had barely any influence on actin ordering. The similarity, i.e., cross-correlation, between vimentin and microtubules was much higher than the one between actin and microtubules. Moreover, prolonged cyclic stretching slightly decoupled the cytoskeletal systems as it reduced the cross-correlations in both cases. Finally, actin and microtubules were more correlated at peripheral regions of cells whereas vimentin and microtubules correlated more in central regions.

Suggested Citation

  • Ronald Springer & Alexander Zielinski & Catharina Pleschka & Bernd Hoffmann & Rudolf Merkel, 2019. "Unbiased pattern analysis reveals highly diverse responses of cytoskeletal systems to cyclic straining," PLOS ONE, Public Library of Science, vol. 14(3), pages 1-23, March.
  • Handle: RePEc:plo:pone00:0210570
    DOI: 10.1371/journal.pone.0210570
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    References listed on IDEAS

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    2. Xavier Trepat & Linhong Deng & Steven S. An & Daniel Navajas & Daniel J. Tschumperlin & William T. Gerthoffer & James P. Butler & Jeffrey J. Fredberg, 2007. "Universal physical responses to stretch in the living cell," Nature, Nature, vol. 447(7144), pages 592-595, May.
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