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Sample Preparation and Imaging of Exosomes by Transmission Electron Microscopy
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Talin-2 regulates integrin functions in exosomes
Zay Yar Soe1, Onmanee Prajuabjinda1, Phyoe Kyawe Myint1
1Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, Tsu, Mie, 514-8507, Japan.
Biochemical and Biophysical Research Communications
|March 19, 2019
Summary
Talin-2 regulates integrin activity on T-cell exosomes, influencing their binding to target cells and internalization. This suggests similar talin-mediated integrin control mechanisms operate in both cells and exosomes.
Area of Science:
- Cellular biology
- Exosome biology
- Immunology
Background:
- Integrins on exosomes mediate cell binding and organ distribution.
- Cellular integrin activity is regulated by talin, but exosomal integrin regulation by talin is unknown.
Purpose of the Study:
- To investigate if talin regulates the activity of integrins on T-cell exosomes.
- To compare talin's role in exosomal integrin regulation with its known role in cellular integrins.
Main Methods:
- Engineered T-cells and T-cell exosomes lacking talin-2.
- Assessed binding of T-cell exosomes to integrin ligands (ICAM-1, MAdCAM-1).
- Evaluated internalization of T-cell exosomes by endothelial cells.
Main Results:
- Talin-2-deficient T-cells and exosomes showed reduced binding to ICAM-1 and MAdCAM-1.
- Talin-2-deficient exosomes exhibited less efficient internalization by endothelial cells.
- Talin-1 levels were unaffected in talin-2 deficient cells and exosomes.
Conclusions:
- Talin-2 is crucial for regulating integrin activity on T-cell exosomes.
- Exosomal integrin regulation by talin mirrors mechanisms found in cellular integrins.
- Findings highlight talin's conserved role in integrin function across cellular and exosomal compartments.
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