Journal
BIOPHYSICAL JOURNAL
Volume 114, Issue 9, Pages 2194-2199Publisher
CELL PRESS
DOI: 10.1016/j.bpj.2018.02.045
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Funding
- Natural Sciences and Engineering Research Council [RGPIN/05843-2014, EQPEQ/472339-2015]
- Canadian Institutes of Health Research [143327]
- Canadian Cancer Society [703930]
- National Institutes of Health [R21HL123522, DP2-OD006649]
- Fonds de recherche Sante Quebec
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Actomyosin contractility is an essential element of many aspects of cellular biology and manifests as traction forces that cells exert on their surroundings. The central role of these forces makes them a novel principal therapeutic target in diverse diseases. This requires accurate and higher-capacity measurements of traction forces; however, existing methods are largely low throughput, limiting their utility in broader applications. To address this need, we employ Fourier-transform traction force microscopy in a parallelized 96-well format, which we refer to as contractile force screening. Critically, rather than the frequently employed hydrogel polyacrylamide, we fabricate these plates using polydimethylsiloxane rubber. Key to this approach is that the polydimethylsiloxane used is very compliant, with a lower-bound Young's modulus of similar to 0.4 kPa. We subdivide these monolithic substrates spatially into biochemically independent wells, creating a uniform multiwell platform for traction force screening. We demonstrate the utility and versatility of this platform by quantifying the compound and dose-dependent contractility responses of human airway smooth muscle cells and retinal pigment epithelial cells. By directly quantifying the endpoint of therapeutic intent, airway-smooth-muscle contractile force, this approach fills an important methodological void in current screening approaches for bronchodilator drug discovery, and, more generally, in measuring contractile response for a broad range of cell types and pathologies.
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