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Intracellular Signaling Affects Focal Adhesions

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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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Related Experiment Video

Updated: May 22, 2026

Real-time Imaging of Leukotriene B4 Mediated Cell Migration and BLT1 Interactions with β-arrestin

Real-time Imaging of Leukotriene B₄ Mediated Cell Migration and BLT1 Interactions with β-arrestin

Published on: December 23, 2010

TβRIII/β-arrestin2 regulates integrin α5β1 trafficking, function, and localization in epithelial cells.

K Mythreye¹, E H Knelson, C E Gatza

¹Department of Medicine, Duke University Medical Center, Durham, NC, USA.

|May 8, 2012

Summary

The type III TGF-β receptor (TβRIII) enhances epithelial cell adhesion by regulating integrin α5β1 trafficking, independent of TGF-β signaling. Increased TβRIII expression predicts better survival in breast cancer patients.

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Last Updated: May 22, 2026

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Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells

Studying TGF-β Signaling and TGF-β-induced Epithelial-to-mesenchymal Transition in Breast Cancer and Normal Cells

Published on: October 27, 2020

Area of Science:

Cell Biology
Molecular Biology
Cancer Research

Background:

The type III TGF-β receptor (TβRIII) is a co-receptor for TGF-β superfamily ligands involved in cancer progression.
TβRIII's role in suppressing cell motility is known, but its precise mechanisms in epithelial cell adhesion are less understood.

Purpose of the Study:

To investigate the role of TβRIII in epithelial cell adhesion to fibronectin.
To elucidate the molecular mechanisms underlying TβRIII-mediated cell adhesion, including its dependence on β-arrestin2 and TGF-β/BMP signaling.
To examine the clinical relevance of TβRIII and integrin α5 localization in breast cancer.

Main Methods:

Investigated TβRIII's interaction with integrin α5β1 in epithelial cells.
Utilized β-arrestin2-dependent mechanisms for integrin α5β1 internalization and trafficking.
Analyzed TβRIII and α5 localization in breast cancer patient samples.

Main Results:

TβRIII promotes epithelial cell adhesion to fibronectin via a β-arrestin2-dependent pathway, independent of TGF-β/BMP.
TβRIII complexes with active integrin α5β1, mediating its trafficking to focal adhesions.
Increased TβRIII expression correlates with enhanced α5 localization and predicts improved survival in breast cancer patients.

Conclusions:

TβRIII plays a novel role in regulating integrin α5β1 localization and epithelial cell adhesion.
A new crosstalk mechanism between integrin and TGF-β superfamily pathways is identified.
β-arrestin2 is identified as a key regulator of α5β1 trafficking, with clinical implications for breast cancer prognosis.