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Related Concept Videos

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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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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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.
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Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
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Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
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The cytoskeleton is an essential cell component that plays several structural and functional roles. However, the filaments that make up the cytoskeleton cannot function independently and depend on the accessory or ancillary proteins to effectively carry out their function. Accessory proteins associate with cytoskeletal filaments and their monomers, aiding filament formation and function. They also help in the cross-communication among cytoskeletal filaments. Cytoskeletal accessory proteins are...
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A Protocol for Using Förster Resonance Energy Transfer (FRET)-force Biosensors to Measure Mechanical Forces across the Nuclear LINC Complex
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Extracellular rigidity sensing by talin isoform-specific mechanical linkages.

Katharina Austen1, Pia Ringer1, Alexander Mehlich2

  • 1Max Planck Institute of Biochemistry, Group of Molecular Mechanotransduction, Martinsried D-82152, Germany.

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|November 3, 2015
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Summary

Cells sense tissue stiffness through talin mechanical linkages that probe extracellular matrix compliance. These talin-actin-vinculin interactions are crucial for focal adhesion reinforcement and rigidity sensing.

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Area of Science:

  • Cell biology
  • Biophysics
  • Mechanobiology

Background:

  • Cell adhesion and sensing tissue stiffness are vital for organ development and function.
  • Mechanisms of cellular detection of extracellular matrix compliance remain largely unknown.

Purpose of the Study:

  • To investigate the molecular mechanisms by which adherent cells detect extracellular matrix compliance.
  • To elucidate the role of talin in cellular rigidity sensing.

Main Methods:

  • Utilized two single-molecule-calibrated biosensors to analyze piconewton forces in cells.
  • Investigated the mechanical properties of talin linkages during cell adhesion.
  • Examined the impact of disrupting talin's mechanical engagement on cell adhesion and rigidity sensing.

Main Results:

  • Talin establishes indispensable mechanical linkages following cell adhesion for probing tissue stiffness.
  • Talin linkages experience forces of 7-10 piconewtons and depend on F-actin and vinculin.
  • Disruption of talin mechanics impairs focal adhesion reinforcement and extracellular rigidity sensing without affecting initial cell adhesion or integrin activation.
  • Talin isoform specificity (talin-1 vs. talin-2) influences extracellular rigidity sensing.

Conclusions:

  • Talin's mechanical engagement is essential for cells to sense tissue stiffness.
  • Cellular rigidity sensing relies on talin-mediated focal adhesion reinforcement.
  • Isoform-specific talin mechanics play a role in modulating extracellular rigidity sensing.