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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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Updated: Jun 11, 2025

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Actin-driven nanotopography promotes stable integrin adhesion formation in developing tissue.

Tianchi Chen1, Cecilia H Fernández-Espartero2,3, Abigail Illand4

  • 1Interdisciplinary Institute for Neuroscience, Université Bordeaux, CNRS, UMR 5297, Bordeaux, France. tianchi.chen@u-bordeaux.fr.

Nature Communications
|October 7, 2024
PubMed
Summary
This summary is machine-generated.

Actin-driven membrane protrusions create nanotopographies that immobilize integrins, forming strong muscle attachment sites (MASs) essential for embryonic morphogenesis. This geometry, not substrate rigidity, drives adhesion maturation.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biophysics

Background:

  • Morphogenesis relies on stabilizing dynamic proteins into macromolecular structures.
  • Integrin adhesions anchor muscles, resisting contractile forces, but their formation mechanisms are unclear.

Purpose of the Study:

  • Investigate how integrin diffusion, immobilization, and activation occur during tissue development.
  • Elucidate the role of actin-driven protrusions and membrane nanotopographies in forming muscle attachment sites (MASs).

Main Methods:

  • Utilized super-resolution microscopy to visualize integrin and actin dynamics.
  • Employed single-particle tracking to analyze protein diffusion and confinement.
  • Experimented with isolated muscle cells and substrate nanotopography.

Main Results:

  • Actin polymerization forms membrane protrusions with nanotopographies at MASs.
  • Integrins assemble into adhesive belts around these protrusions, forming invadosome-like structures.
  • Integrins and actin filaments become immobilized within nanotopographical diffusion traps during MAS development.
  • Substrate nanotopography, not rigidity, drives adhesion maturation by controlling actin protrusion and integrin dynamics.

Conclusions:

  • Actin-polymerization-driven membrane protrusions are crucial for establishing robust integrin adhesions in developing embryos.
  • Membrane nanotopography plays a significant role in regulating integrin behavior and adhesion formation.
  • Geometry is a key factor in the mechanical processes underlying morphogenesis.