Shear force at the cell-matrix interface: Enhanced analysis for microfabricated post array detectors

Christopher A. Lemmon, Nathan J. Sniadecki, Sami Alom Ruiz, John L. Tan, Lewis H. Romer, Christopher S. Chen

Research output: Contribution to journalArticlepeer-review

Abstract

The interplay of mechanical forces between the extracellular environment and the cytoskeleton drives development, repair, and senescence in many tissues. Quantitative definition of these forces is a vital step in understanding cellular mechanosensing. Microfabricated post array detectors (mPADs) provide direct measurements of cell-generated forces during cell adhesion to extracellular matrix. A new approach to mPAD post labeling, volumetric imaging, and an analysis of post bending mechanics determined that cells apply shear forces and not point moments at the matrix interface. In addition, these forces could be accurately resolved from post deflections by using images of post tops and bases. Image analysis tools were then developed to increase the precision and throughput of post centroid location. These studies resulted in an improved method of force measurement with broad applicability and concise execution using a fully automated force analysis system. The new method measures cell-generated forces with less than 5%error and less than 90 seconds of computational time. Using this approach, we demonstrated direct and distinct relationships between cellular traction force and spread cell surface area for fibroblasts, endothelial cells, epithelial cells and smooth muscle cells.

Original languageEnglish (US)
Pages (from-to)1-6
Number of pages6
JournalMCB Mechanics and Chemistry of Biosystems
Volume2
Issue number1
StatePublished - Mar 2005

Keywords

  • Actomyosin
  • Cell adhesion
  • Cytoskeleton
  • Focal adhesions
  • Image analysis
  • Mechanical
  • Mechanosensors
  • Microfabricated post array detectors
  • PDMS
  • Shear force
  • Stress

ASJC Scopus subject areas

  • Chemistry (miscellaneous)
  • Biochemistry, Genetics and Molecular Biology (miscellaneous)

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