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Activation of Integrins

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.

Integrins

Integrins

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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Intracellular Signaling Affects Focal Adhesions

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.
Some...

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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Activation and Inactivation of G Proteins

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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...

Cell-matrix's Response to Mechanical Forces

Cell-matrix's Response to Mechanical Forces

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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Related Experiment Video

Updated: Jun 26, 2026

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

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Published on: March 8, 2017

Mechanically activated integrin switch controls alpha5beta1 function.

Julie C Friedland¹, Mark H Lee, David Boettiger

¹Institute for Medicine and Engineering, University of Pennsylvania, Philadelphia, PA 19104, USA.

Science (New York, N.Y.)

|January 31, 2009

Summary

Cellular mechanical forces, including cytoskeletal force and extracellular matrix stiffness, regulate alpha(5)beta(1) integrin function. This integrin switch controls cell adhesion, motility, and signaling, impacting tissue development and cancer progression.

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

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Published on: June 13, 2014

Area of Science:

Cell Biology
Biophysics
Biochemistry

Background:

Cellular functions like development and homeostasis rely on the cytoskeleton, integrin adhesion, and substrate stiffness.
The interplay between these mechanical factors and cellular chemical signaling pathways remains poorly understood.
Dysregulation of these mechanical elements is frequently observed in cancer.

Purpose of the Study:

To investigate the connection between mechanical forces and integrin-mediated signaling.
To elucidate how cytoskeletal force and extracellular matrix stiffness influence alpha(5)beta(1) integrin.
To determine the role of this integrin switch in cellular adhesion, motility, and signaling.

Main Methods:

Utilized studies on myosin II-generated cytoskeletal force.
Investigated the impact of extracellular matrix stiffness on integrin states.
Analyzed alpha(5)beta(1) integrin's interaction with fibronectin, including the synergy site.
Assessed the role of focal adhesion kinase (FAK) phosphorylation.

Main Results:

Alpha(5)beta(1) integrin transitions between relaxed and tensioned states, driven by myosin II-generated cytoskeletal force.
Combined mechanical forces from the cytoskeleton and extracellular matrix trigger an integrin switch.
This switch modulates alpha(5)beta(1)-fibronectin bond strength by engaging the fibronectin synergy site.
The integrin switch is essential for initiating signals via focal adhesion kinase phosphorylation.

Conclusions:

A novel mechanism links mechanical forces to integrin signaling pathways.
The alpha(5)beta(1) integrin switch acts as a critical mediator between mechanical cues and cellular responses.
This findings have implications for understanding tissue mechanics, cell adhesion, motility, and signaling in both normal physiology and disease states like cancer.