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A Novel Cell Traction Force Microscopy to Study Multi-Cellular System

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  • Xin Tang
  • Alireza Tofangchi
  • Sandeep V Anand
  • Taher A Saif

Abstract

Traction forces exerted by adherent cells on their microenvironment can mediate many critical cellular functions. Accurate quantification of these forces is essential for mechanistic understanding of mechanotransduction. However, most existing methods of quantifying cellular forces are limited to single cells in isolation, whereas most physiological processes are inherently multi-cellular in nature where cell-cell and cell-microenvironment interactions determine the emergent properties of cell clusters. In the present study, a robust finite-element-method-based cell traction force microscopy technique is developed to estimate the traction forces produced by multiple isolated cells as well as cell clusters on soft substrates. The method accounts for the finite thickness of the substrate. Hence, cell cluster size can be larger than substrate thickness. The method allows computing the traction field from the substrate displacements within the cells' and clusters' boundaries. The displacement data outside these boundaries are not necessary. The utility of the method is demonstrated by computing the traction generated by multiple monkey kidney fibroblasts (MKF) and human colon cancerous (HCT-8) cells in close proximity, as well as by large clusters. It is found that cells act as individual contractile groups within clusters for generating traction. There may be multiple of such groups in the cluster, or the entire cluster may behave a single group. Individual cells do not form dipoles, but serve as a conduit of force (transmission lines) over long distances in the cluster. The cell-cell force can be either tensile or compressive depending on the cell-microenvironment interactions.Author Summary: Adherent cells sense, transduce and respond to their microenvironment by generating traction forces on their surroundings. To accurately understand these mechanotransduction processes, it is critical to have a robust and reliable method for traction force visualization and quantification. However, most cell traction force microscopy methods are limited to only single cell traction force analysis. Considering that most physiological processes are essentially collective multi-cellular events, there is a need for traction force microscopy methods capable of analyzing traction forces resulting from multiple cells. We have developed a novel and robust multi-cellular traction force microscopy method for computing cell traction on soft substrates, and applied it to compute traction field generated by both multiple cells and cell clusters. We verified the accuracy, robustness, and efficiency of the method by theoretical, numerical and experimental approaches. Our method provides a powerful toolset to pursue the mechanistic understanding of collective biological activities, such as cancer metastasis and neuromuscular interactions.

Suggested Citation

  • Xin Tang & Alireza Tofangchi & Sandeep V Anand & Taher A Saif, 2014. "A Novel Cell Traction Force Microscopy to Study Multi-Cellular System," PLOS Computational Biology, Public Library of Science, vol. 10(6), pages 1-15, June.
  • Handle: RePEc:plo:pcbi00:1003631
    DOI: 10.1371/journal.pcbi.1003631
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    References listed on IDEAS

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    1. Cornelis Storm & Jennifer J. Pastore & F. C. MacKintosh & T. C. Lubensky & Paul A. Janmey, 2005. "Nonlinear elasticity in biological gels," Nature, Nature, vol. 435(7039), pages 191-194, May.
    2. Christian Franck & Stacey A Maskarinec & David A Tirrell & Guruswami Ravichandran, 2011. "Three-Dimensional Traction Force Microscopy: A New Tool for Quantifying Cell-Matrix Interactions," PLOS ONE, Public Library of Science, vol. 6(3), pages 1-15, March.
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    1. Gaspard Pardon & Alison S. Vander Roest & Orlando Chirikian & Foster Birnbaum & Henry Lewis & Erica A. Castillo & Robin Wilson & Aleksandra K. Denisin & Cheavar A. Blair & Colin Holbrook & Kassie Kole, 2024. "Tracking single hiPSC-derived cardiomyocyte contractile function using CONTRAX an efficient pipeline for traction force measurement," Nature Communications, Nature, vol. 15(1), pages 1-19, December.

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