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Collective cell traction force analysis on aligned smooth muscle cell sheet between three-dimensional microwalls
Ying Zhang1, Soon Seng Ng1, Yilei Wang1
1Center of Biotechnology, School of Chemical and Biomedical Engineering , Nanyang Technological University , 639798 Singapore , Singapore.
Interface Focus
|April 22, 2014
Summary
Researchers developed a novel microwall system to study how smooth muscle cells (SMCs) sense and respond to mechanical cues. This biomaterial helps understand cell alignment and its impact on blood vessel tissue engineering.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Cell Mechanobiology
Background:
- Tissue engineering of blood vessels is challenging due to complex histology.
- Vascular smooth muscle cells (SMCs) are critical for blood vessel function, but their mechanotransduction is poorly understood.
- Understanding SMC mechanotransduction is key for developing functional vascular grafts.
Purpose of the Study:
- To investigate the mechanotransduction of SMCs within a microfabricated scaffold.
- To explore how topographical cues influence SMC alignment and behavior.
- To provide insights into the cellular mechanisms underlying vascular tissue engineering.
Main Methods:
- Microfabricated arrays of discontinuous microwalls coated with fluorescent microbeads were used to probe SMC mechanotransduction.
- Atomic force microscopy and regression analysis measured the elastic modulus of gel layers.
- Traction force assays were extended for 3D cell aggregates.
- Finite-element modeling analyzed cell-cell and cell-microwall interactions.
Main Results:
- Traction forces were lower in aligned cells between microwalls compared to those near microwalls.
- Spatial distribution of Von Mises stress depended on collective cell orientation.
- Collective mechanotransduction correlated with reduced actin and vinculin expression.
- Microwalls modulated focal adhesion formation via cytoskeletal protein regulation.
Conclusions:
- The developed microwall system quantitatively assesses cooperative cell-cell and cell-microwall interactions.
- Three-dimensional topographic cues significantly influence SMC mechanotransduction and cytoskeletal organization.
- Findings advance understanding of SMC behavior for vascular tissue engineering applications.
