Cellogram: On-the-Fly Traction Force Microscopy

Tobias Lendenmann, Teseo Schneider, Jérémie Dumas, Marco Tarini, Costanza Giampietro, Apratim Bajpai, Weiqiang Chen, Julia Gerber, Dimos Poulikakos, Aldo Ferrari, Daniele Panozzo

Research output: Contribution to journalArticle

Abstract

Traction force microscopy (TFM) derives maps of cell-generated forces, typically in the nanonewton range, transmitted to the extracellular environment upon actuation of complex biological processes. In traditional approaches, force rendering requires a terminal, time-consuming step of cell deadhesion to obtain a reference image. A conceptually opposite approach is provided by reference-free methods, opening to the on-the-fly generation of force maps from an ongoing experiment. This requires an image processing algorithm keeping the pace of the biological phenomena under investigation. Here, we introduce an integrated software pipeline rendering force maps from single reference-free TFM images seconds to minutes after their acquisition. The algorithm tackles image processing, reference image estimation, and finite element analysis as a single problem, yielding a robust and fully automatic solution. The method's capabilities are demonstrated in two applications. First, the mechanical annihilation of cancer cells is monitored as a function of rising environmental temperature, setting a population threshold at 45 °C. Second, the fast temporal correlation of forces produced across individual cells is used to map physically connected adhesion points, yielding typical lengths that vary as a function of the cell cycle phase.

Original languageEnglish (US)
Pages (from-to)6742-6750
Number of pages9
JournalNano Letters
Volume19
Issue number10
DOIs
StatePublished - Oct 9 2019

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Keywords

  • cTFM
  • focal adhesion
  • Real time analysis
  • reference free
  • stress fibers
  • traction force microscopy

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Lendenmann, T., Schneider, T., Dumas, J., Tarini, M., Giampietro, C., Bajpai, A., Chen, W., Gerber, J., Poulikakos, D., Ferrari, A., & Panozzo, D. (2019). Cellogram: On-the-Fly Traction Force Microscopy. Nano Letters, 19(10), 6742-6750. https://doi.org/10.1021/acs.nanolett.9b01505