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A novel culture morphology resulting from applied mechanical strain
1Cell and Molecular Biology Laboratory, NASA-Ames Research Center and Bionetics Corporation, Moffett Field, California 94035, USA.
Summary
Cells perceive and respond to mechanical force by altering their shape and alignment. This study shows how cell density and aging affect cellular responses to mechanical strain, highlighting the role of cytoskeletal integrity.
Area of Science:
- Cell Biology
- Biophysics
- Tissue Engineering
Background:
- Cells are known to interact with their environment.
- Mechanical forces play a role in cellular processes.
- Understanding cellular mechanotransduction is crucial for tissue regeneration.
Purpose of the Study:
- To investigate cellular perception and response to external mechanical force.
- To examine the influence of cell density and aging on cellular alignment under strain.
- To elucidate the role of microfilaments in mechanotransduction.
Main Methods:
- Culturing human fetal and aged dermal fibroblasts on flexible membranes.
- Applying a controlled strain/relaxation regimen (20% elongation at 6.67 cycles/min).
- Utilizing cytochalasin D to assess the role of microfilaments.
Main Results:
- Cells aligned parallel to the applied force, forming a radial distribution.
- High cell density hindered alignment in fetal fibroblasts, suggesting a preference for cell-cell contacts.
- Aged fibroblasts aligned efficiently across all tested densities.
- Microfilament disruption affected the morphological response to mechanical strain.
Conclusions:
- Cells actively perceive and respond to mechanical forces.
- Cellular responses to strain are modulated by cell density, age, and intercellular interactions.
- Cytoskeletal integrity, particularly microfilaments, is essential for mediating these responses.