Related Experiment Video
Updated: Jun 18, 2026
09:20
Perturbing Endothelial Biomechanics via Connexin 43 Structural Disruption
Published on: October 4, 2019
Quantifying intracellular mechanosensitive response upon spatially defined mechano-chemical triggering
Elaheh Zare-Eelanjegh1, Renard T M Lewis2, Ines Lüchtefeld1
1Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Zurich, Switzerland.
Elife
|June 17, 2026
Summary
Cellular force transmission involves mechanical and biochemical signals. This study reveals distinct roles for A- and B-type lamins in nuclear mechanotransduction and how microtubules adapt to tension, offering insights for treating mechanical stress diseases.
Area of Science:
- Cell Biology
- Biophysics
- Mechanobiology
Background:
- Mechanotransduction converts mechanical stimuli into biochemical signals via cellular components like actin, microtubules, and the nuclear lamina.
- Understanding the nuclear lamina's role in mechanotransmission is crucial for cellular force response.
- Fluidic Force Microscopy (FluidFM) offers a method for in situ mechanical and chemical cell manipulation.
Purpose of the Study:
- To investigate the distinct roles of A- and B-type lamins in the nuclear mechanotransduction process.
- To explore how nuclear lamina composition influences cellular responses to external mechanical cues.
- To elucidate the dynamic behavior of microtubules in response to altered nuclear lamina states.
Main Methods:
- Utilized Fluidic Force Microscopy (FluidFM) for mechanical manipulation of cells.
- Employed Fluorescence Lifetime Imaging Microscopy (FLIM) for high-resolution mapping of intracellular tension.
- Examined cells with varying nuclear lamina compositions, including lamin A/C knockout models.
Main Results:
- A-type lamins were found to contribute to nuclear elasticity, while B-type lamins influenced viscous response.
- Microtubules exhibited mechanical adaptation, releasing tension in lamin A/C knockout cells.
- In healthy cells, microtubules preserved local tension, unlike in knockout cells where they aided tension release.
Conclusions:
- Nuclear lamins (A- and B-type) play distinct roles in initiating and modulating nuclear mechanotransduction.
- Microtubule dynamics are crucial for adapting to and regulating cellular tension, particularly in the absence of specific lamins.
- Findings provide insights into cellular mechanosensing and potential therapeutic targets for diseases linked to mechanical stress.
Related Concept Videos
01:13Cell-matrix's Response to Mechanical Forces
In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue.
Anchoring junctions mechanically attach a cell to the...
Anchoring junctions mechanically attach a cell to the...
01:26Tension Response at Adherens Junctions
The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...
01:58Mechanical Protein Functions
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force.
01:12Mechanically-gated Ion Channels
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...