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Related Concept Videos

Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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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Tension Gauge Tether Probes for Quantifying Growth Factor Mediated Integrin Mechanics and Adhesion
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Pull and push: talin activation for integrin signaling.

Jia-huai Wang1

  • 1College of Life Sciences, Peking University, Beijing 100871, China [2] Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215, USA. jwang@red.dfci.harvard.edu

Cell Research
|July 11, 2012
PubMed
Summary
This summary is machine-generated.

Integrins control cell surface receptor binding through inside-out signaling. A "pull-push" mechanism involving talin and PIP2-enriched membranes activates integrins for cell survival.

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Last Updated: May 20, 2026

Tension Gauge Tether Probes for Quantifying Growth Factor Mediated Integrin Mechanics and Adhesion
09:56

Tension Gauge Tether Probes for Quantifying Growth Factor Mediated Integrin Mechanics and Adhesion

Published on: February 11, 2022

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
09:14

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes

Published on: June 13, 2014

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads
07:55

Analyzing Cell Surface Adhesion Remodeling in Response to Mechanical Tension Using Magnetic Beads

Published on: March 8, 2017

Area of Science:

  • Cell biology
  • Biochemistry
  • Molecular biology

Background:

  • Integrins are crucial cell surface receptors that regulate cell adhesion and migration.
  • Inside-out signaling modulates integrin ligand-binding affinity in response to environmental cues.
  • Talin binding to the integrin β subunit tail is essential for activating integrins.

Purpose of the Study:

  • To elucidate the mechanism of integrin activation through inside-out signaling.
  • To investigate the role of the talin-FERM domain and its interaction with the membrane.
  • To understand how membrane composition influences integrin signaling.

Main Methods:

  • Proposed a "pull-push" mechanism model.
  • Investigated the disruption of auto-inhibition between talin domains.
  • Focused on the interaction between talin-FERM domain and PIP2-enriched membranes.

Main Results:

  • The "pull-push" mechanism explains how membrane disruption activates talin.
  • PIP2-rich membranes disrupt the auto-inhibition of talin's N-terminal FERM domain by its C-terminal rod domain.
  • Activated talin-FERM domain gains access to the integrin β subunit tail.

Conclusions:

  • Inside-out signaling is regulated by a talin-mediated "pull-push" mechanism.
  • Membrane lipid composition, specifically PIP2, plays a critical role in integrin activation.
  • This mechanism is vital for integrin function and subsequent cell survival.