Related Experiment Videos
Mechanotransduction across the cell surface and through the cytoskeleton
N Wang1, J P Butler, D E Ingber
1Respiratory Biology Program, Harvard School of Public Health, Boston, MA 02115.
Science (New York, N.Y.)
|May 21, 1993
Summary
Integrins act as cell mechanoreceptors, sensing mechanical stress to stiffen the cytoskeleton. This force transmission involves the entire cell
Area of Science:
- Cell biology
- Biophysics
- Mechanobiology
Background:
- Cell surface receptors play a crucial role in sensing the cellular microenvironment.
- Understanding how cells respond to mechanical forces is vital for comprehending tissue development and disease.
Purpose of the Study:
- To investigate the role of specific cell surface receptors, particularly integrins, in mechanotransduction.
- To determine how mechanical stress is transmitted through the cell and affects cytoskeletal properties.
Main Methods:
- Application of controlled mechanical stress to cell surface receptors using a magnetic twisting device.
- Analysis of focal adhesion formation and cytoskeletal stiffness in response to applied forces.
- Utilizing tensegrity models to simulate cellular mechanical responses.
Main Results:
- Integrin beta 1, an extracellular matrix receptor, induced focal adhesion formation and a force-dependent stiffening response.
- Nonadhesion receptors did not elicit similar responses.
- Cytoskeletal stiffness increased proportionally to applied stress, requiring intact microtubules, intermediate filaments, and microfilaments.
- Tensegrity models successfully mimicked the observed cellular mechanical response.
Conclusions:
- Integrins function as mechanoreceptors, effectively transmitting mechanical signals to the cytoskeleton.
- Mechanotransduction is mediated through force-induced rearrangements within a tensionally integrated cytoskeleton, potentially occurring simultaneously at multiple intracellular locations.