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Related Concept Videos

Intracellular Signaling Affects Focal Adhesions01:17

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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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Tension Response at Adherens Junctions01:26

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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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Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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Updated: Jan 7, 2026

Measurement of Force-Sensitive Protein Dynamics in Living Cells Using a Combination of Fluorescent Techniques
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Talin force coupling underlies eukaryotic cell-substrate adhesion.

Srishti Rangarajan1, Lena Espeter1, Hannes C A Drexler2

  • 1University of Münster, Institute of Integrative Cell Biology and Physiology, Münster, Germany.

Nature Communications
|December 6, 2025
PubMed
Summary
This summary is machine-generated.

Talin, an actin-binding protein, is crucial for transmitting forces in unicellular organisms and animals. Its evolution paved the way for integrin-mediated cell adhesion and force transmission in multicellular life.

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Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Biophysics

Background:

  • Integrin-mediated cell adhesion and mechanotransduction are vital for animal evolution.
  • These processes are thought to involve a conserved force coupling mechanism.

Purpose of the Study:

  • To investigate the evolutionary origins of integrin-mediated cell adhesion and mechanotransduction.
  • To explore the role of the actin-binding protein talin in force transmission across different organisms.

Main Methods:

  • Comparative molecular mechanics analysis of talin-A from amoeboid cells and mammalian talin-1.
  • Investigating force transmission mechanisms in unicellular organisms lacking canonical integrin receptors.

Main Results:

  • Talin mediates conserved pN-scale force transmission in unicellular organisms, even without integrins.
  • Identified key evolutionary steps involving talin specialization, integrin activation, and associated signaling pathways.

Conclusions:

  • Talin plays a central, underappreciated role in the evolution of eukaryotic cell-substrate adhesion and force transmission.
  • The evolution of integrin-mediated adhesion in metazoans involved talin specialization and recruitment of regulatory proteins.