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Cell-matrix's Response to Mechanical Forces01:13

Cell-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. 
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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...

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Related Experiment Video

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Visualizing dynamic cytoplasmic forces with a compliance-matched FRET sensor.

Fanjie Meng1, Frederick Sachs

  • 1Center for Single Molecule Biophysics, Department of Physiology and Biophysics, State University of New York at Buffalo, 3435 Main Street, Buffalo, NY 14214, USA.

Journal of Cell Science
|December 22, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed a new FRET-based sensor to measure mechanical stress within cells. This sensor revealed dynamic stress gradients in the cytoskeleton, responding to cell contraction and osmotic pressure changes.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Mechanical forces significantly influence cellular activity, yet intracellular mechanical stresses remain poorly understood.
  • Genetically encoded Förster Resonance Energy Transfer (FRET)-based force sensors enable real-time measurement of local stress in host proteins.
  • Existing methods offer limited insight into the dynamic mechanical environment within living cells.

Purpose of the Study:

  • To develop and validate a novel, minimally invasive FRET-based sensor for measuring mechanical stress in cytoskeletal proteins.
  • To investigate the spatial and temporal dynamics of cytoskeletal stress in living cells.
  • To explore the relationship between external osmotic stress and internal cytoskeletal tension.

Main Methods:

  • Design and characterization of a spectrin repeat-based FRET sensor (sstFRET) with mechanical compliance matching cytoskeletal proteins.
  • In vitro calibration of the sstFRET probe using DNA springs to quantify force sensitivity (5-7 pN).
  • In vivo application by inserting sstFRET into α-actinin, expressed in HEK and BAEC cells, followed by time-lapse imaging and pharmacological interventions (thrombin, myosin II inhibition).

Main Results:

  • sstFRET successfully measured stress gradients within the cytoskeleton in real-time, often independent of cell shape.
  • Cytoskeletal tension rapidly fluctuated, indicating a dynamic equilibrium, and could be relaxed by thrombin-induced contraction.
  • Hypotonic swelling increased α-actinin tension, while anisotropic stress induced transient changes in tension, suggesting reorientation of actinin under osmotic challenge.

Conclusions:

  • The sstFRET probe provides a powerful tool for real-time, in vivo measurement of intracellular mechanical stress.
  • The cytoskeleton exists in a dynamic equilibrium, with tension influenced by both internal contractility and external forces like osmotic pressure.
  • Osmotic stress can actively reorient cytoskeletal components, altering their force-bearing capacity and revealing new insights into cell mechanics.