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Activated Extracellular Vesicles as New Therapeutic Targets?
Lucia R Languino1, D Craig Hooper1
1Department of Cancer Biology, Thomas Jefferson University, Philadelphia, PA 19107, USA.
Trends in Cell Biology
|March 4, 2019
Summary
Activated neutrophils release exosomes that degrade extracellular proteins. These neutrophil-derived exosomes protect elastase from inhibitors, leading to lung tissue damage.
Area of Science:
- Biochemistry
- Cell Biology
- Immunology
Background:
- Neutrophils are key immune cells involved in inflammation.
- Extracellular protein degradation is crucial in tissue remodeling and disease.
- Neutrophil elastase is a potent protease implicated in tissue damage.
Purpose of the Study:
- To investigate the role of neutrophil-derived extracellular vesicles (exosomes) in extracellular protein degradation.
- To determine how neutrophil elastase is protected from inhibition in the extracellular space.
Main Methods:
- Analysis of exosomes released by activated neutrophils.
- Assays to measure elastase activity and its protection from α1 antitrypsin.
- Microscopic examination of lung tissue.
Main Results:
- Activated neutrophils release exosomes carrying neutrophil elastase.
- Exosomes protect elastase from inactivation by α1 antitrypsin.
- This mechanism leads to pathological degradation of extracellular protein fibrils in lung alveoli.
Conclusions:
- Neutrophil-derived exosomes are potent mediators of extracellular protein degradation.
- Exosome protection of elastase contributes to lung tissue pathology.
- Targeting neutrophil exosomes may offer therapeutic strategies for inflammatory lung diseases.
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