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Related Experiment Video

Updated: Apr 18, 2026

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

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

Published on: June 13, 2014

Ligand-Occupied Integrin Internalization Links Nutrient Signaling to Invasive Migration.

Elena Rainero¹, Jonathan D Howe², Patrick T Caswell³

¹Beatson Institute for Cancer Research, Garscube Estate, Glasgow G61 1BD, UK.

|January 21, 2015

Summary

This summary is machine-generated.

Integrin trafficking directs cell migration. This study reveals Arf4-dependent endocytosis of α5β1 integrins to lysosomes, linking nutrient signaling, mTOR, and metastasis.

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Integrin trafficking is crucial for cell migration.
The spatiotemporal organization of integrin endocytosis remains poorly understood.

Purpose of the Study:

To elucidate the mechanisms and regulation of α5β1 integrin endocytosis.
To investigate the role of Arf4 in integrin trafficking and its connection to nutrient signaling and metastasis.

Main Methods:

Investigated α5β1 integrin movement using live-cell imaging.
Utilized genetic suppression of Arf4 and tensin to study endocytosis.
Examined lysosome positioning and mTOR signaling.

Main Results:

α5β1 integrin moves centripetally to subnuclear adhesions, followed by Arf4-dependent endocytosis.
Arf4-mediated internalization traffics integrins to late endosomes/lysosomes for degradation.
Arf4 is essential for lysosome positioning and mTOR activation.
Nutrient depletion enhances integrin endocytosis via mTORC1 inhibition.

Conclusions:

Arf4-dependent integrin endocytosis is a key regulatory step in cell migration.
A feedback loop exists between mTORC1 and integrin trafficking.
Integrin trafficking, nutrient signaling, and metastasis are interconnected.