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Mechanical Point Loading Induces Cortex Stiffening and Actin Reorganization.
Jinrong Hu1, Shenbao Chen1, Wenhui Hu2
1Center of Biomechanics and Bioengineering, Key Laboratory of Microgravity (National Microgravity Laboratory), Beijing Key Laboratory of Engineered Construction and Mechanobiology, and CAS Center for Excellence in Complex System Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, China; School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China.
Localized cell loading stiffens the cell surface, protecting the nucleus from stress. Increased force and duration amplify cytoskeleton reorganization, revealing rapid actin dynamics in response to mechanical stimuli.
Area of Science:
- Cellular Mechanics
- Biophysics
- Cytoskeleton Dynamics
Background:
- Cellular responses to mechanical stimuli are crucial for biological processes.
- While global cytoskeleton reorganization is known, localized cellular responses remain poorly understood.
Purpose of the Study:
- To investigate localized cell-surface mechanical property changes after static point loading.
- To quantify cytoskeleton reorganization and its relationship with applied force and duration.
- To understand the transmission of localized mechanical forces into adherent cells.
Main Methods:
- Atomic Force Microscopy (AFM) in PeakForce-Quantitative Nano Mechanics mode for cell-surface stiffness mapping.
- Mechanical modeling to assess stress and strain on the nucleus.
- AFM probes and microneedle with confocal microscopy for quantitative cytoskeleton analysis.
Main Results:
- Cell-surface stiffness increased up to 1.35-fold near the loading site, indicating cortical stiffening.
- Mechanical modeling showed decreased nuclear stress (9-15%) and strain (10-19%) due to cortical stiffening.
- Cytoskeleton reorganization was more pronounced with higher forces and longer loading times.
- Fast actin cytoskeleton reorganization (<10 s) was observed in live cells after point loading.
Conclusions:
- Static point loading induces localized stiffening of the cell cortex, providing mechanical protection to the nucleus.
- Cytoskeleton reorganization is a force- and time-dependent response to localized mechanical stimuli.
- These findings enhance understanding of how cells perceive and respond to mechanical forces at a localized level.
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