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Updated: Jun 8, 2025
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Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
Published on: May 10, 2022
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Mechanical fatigue in microtubules
Syeda Rubaiya Nasrin1, Neda M Bassir Kazeruni2, Juan B Rodriguez2
1Division of Physics and Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwake-Cho, Sakyo-ku, Kyoto, 606-8502, Japan.
Scientific Reports
|November 2, 2024
Summary
Microtubules, crucial for cell structure, can fail under repeated stress. This study quantifies their fatigue life, revealing failure after millions of cycles at low compression but thousands at higher levels.
Area of Science:
- Biophysics
- Cell Biology
- Materials Science
Background:
- Mechanical failure of biological nanostructures is well-studied under sustained force.
- Fatigue failure from repeated subcritical stress in microtubules is under-investigated.
- Microtubules are essential cytoskeletal components involved in various cellular processes.
Purpose of the Study:
- To investigate fatigue failure mechanisms in microtubules.
- To quantify fatigue life parameters of paclitaxel-stabilized microtubules.
- To assess microtubule resilience under cyclic mechanical stress relevant to cellular functions.
Main Methods:
- Paclitaxel-stabilized microtubules were subjected to repeated sinusoidal bending.
- Varying wavelengths and frequencies of applied force were used.
- Failure events were recorded to determine fatigue life.
Main Results:
- Microtubules exhibited fatigue failure under repeated buckling.
- At 12.5% compression, failure occurred after an average of 5 million cycles.
- At 20.0% compression, failure occurred after an average of 1,000 cycles.
- The fatigue strength (Basquin) exponent B was estimated as -0.054±0.009.
Conclusions:
- Microtubules demonstrate significant fatigue susceptibility.
- Fatigue life is highly dependent on the magnitude of applied compressive stress.
- These findings highlight the importance of considering fatigue in microtubule mechanics and cellular function.
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