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Related Concept Videos

Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

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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
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Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Integrins

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Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
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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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Cell-matrix's Response to Mechanical Forces01:13

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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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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...
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Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
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Integrin-mediated mechanotransduction.

Zhiqi Sun1, Shengzhen S Guo2, Reinhard Fässler2

  • 1Max Planck Institute of Biochemistry, 82152 Martinsried, Germany zsun@biochem.mpg.de.

The Journal of Cell Biology
|November 23, 2016
PubMed
Summary
This summary is machine-generated.

Cells sense and respond to their physical surroundings via mechanotransduction. This process, involving integrins and the extracellular matrix, influences cell behavior and is crucial for tissue health and disease.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Cells interact with their biophysical environment through integrin-based adhesion sites.
  • Mechanotransduction allows cells to adapt to the extracellular matrix (ECM).

Purpose of the Study:

  • To elucidate the mechanisms of integrin-mediated mechanotransduction.
  • To highlight the role of the molecular clutch in force transmission.
  • To explain how mechanical forces regulate cellular responses.

Main Methods:

  • Focuses on the molecular mechanisms of force transmission at integrin adhesions.
  • Describes the role of the F-actin cytoskeleton and myosin II.
  • Explains the function of mechanosensitive focal adhesion proteins.

Main Results:

  • Integrins link the ECM to the cytoskeleton, transmitting forces via the molecular clutch.
  • Mechanical forces create reciprocity between ECM viscoelasticity and cellular tension.
  • Force application alters protein function, triggering biochemical signals.

Conclusions:

  • Integrin-mediated mechanotransduction is vital for cellular adaptation and tissue homeostasis.
  • Dysregulation of this process is linked to various diseases.
  • Understanding mechanotransduction offers insights into disease mechanisms and potential therapies.