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Related Concept Videos

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
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Integrin-based mechanosensing through conformational deformation.

Tristan P Driscoll1, Tamara C Bidone2, Sang Joon Ahn3

  • 1Department of Chemical and Biomedical Engineering, FAMU-FSU College of Engineering, Tallahassee, Florida.

Biophysical Journal
|September 12, 2021
PubMed
Summary
This summary is machine-generated.

Integrin activation, a key process in cell function, is regulated by conformational changes. This study shows that force-induced integrin deformation plays a crucial role in how cells sense and respond to mechanical cues from their environment.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Integrin activation involves conformational changes from low to high affinity states, crucial for cellular processes like immunity and development.
  • Integrin conformational states are regulated by large-scale transitions, influencing cell adhesion and signaling.

Purpose of the Study:

  • To investigate the role of integrin conformational activation in cellular mechanosensing.
  • To determine how integrin mutations affect cellular responses to substrate stiffness.
  • To explore the relationship between force, integrin conformation, and cellular mechanical sensing.

Main Methods:

  • Comparison of wild-type and activating mutants of integrin αVβ3 in cellular assays.
  • Analysis of cell spreading, focal adhesion kinase activation, traction stress, and force on talin.
  • Utilizing coarse-grained computational models based on molecular data to predict integrin behavior under force.

Main Results:

  • Activating integrin mutants shifted cellular responses (spreading, FAK activation, traction stress) to lower stiffness values compared to wild-type.
  • All activated mutants exhibited similar binding affinity for soluble ligands, but the β3 S243E mutant showed the most pronounced mechanical response shift.
  • Computational models predicted that force deforms integrin αVβ3, with activating mutations lowering the force required for this deformation, particularly for S243E.

Conclusions:

  • Cellular stiffness sensing is directly correlated with the computed effects of force on integrin conformation.
  • Force-induced conformational deformation of integrins is identified as a key mechanism in cellular mechanosensing.
  • Specific integrin mutations can alter the mechanical forces required for conformational changes, influencing cellular responses to stiffness.