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Updated: Jun 23, 2026
Characterization of Immune Cell-derived Extracellular Vesicles and Studying Functional Impact on Cell Environment
Published on: June 2, 2020
Comparison of different methods for isolating CD8+ T lymphocyte-derived extracellular vesicles and supramolecular
Ashwin K Jainarayanan1,2, Jesusa Capera1, Pablo F Céspedes1
1Kennedy Institute of Rheumatology, Nuffield Department of Orthopedics, Rheumatology and, Musculoskeletal Sciences University of Oxford Oxford UK.
Insights
Researchers compared methods for isolating CD8+ T cell particles, finding size exclusion chromatography yields high-quality extracellular vesicles (EVs) and supramolecular attack particles (SMAPs) for immune studies.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- CD8+ T lymphocytes are crucial for cell-mediated immunity.
- Activated CD8+ T cells release extracellular particles like extracellular vesicles (EVs) and supramolecular attack particles (SMAPs).
- These particles play roles in cell signaling, immune regulation, and host defense.
Purpose of the Study:
- To compare common isolation techniques for CD8+ T cell-derived particles.
- To evaluate the impact of isolation methods on particle yield, purity, and composition.
- To determine the optimal method for obtaining high-quality T cell particles for further analysis.
Main Methods:
- Comparison of membrane spin filtration, ultracentrifugation, and size exclusion liquid chromatography (SEC) for isolating particles from activated human CD8+ T cells.
- Validation using nanoparticle tracking analysis, flow cytometry, electron microscopy, and super-resolution microscopy.
- Comprehensive analysis of particle composition via bulk proteomics and lipidomics.
Main Results:
- A trade-off exists between particle yield and quality depending on the isolation technique.
- Isolation methods significantly alter the protein and lipid profiles of T cell-derived particles.
- SEC provided the highest quality EVs and SMAPs with acceptable yields.
Conclusions:
- The choice of isolation technique critically influences the characteristics of CD8+ T cell-derived particles.
- Size exclusion liquid chromatography is recommended for isolating high-quality EVs and SMAPs for compositional and functional studies.
- Understanding these differences is vital for accurate interpretation of T cell particle research.
Abstract:
CD8+ T lymphocytes play vital roles in killing infected or deranged host cells, recruiting innate immune cells, and regulating other aspects of immune responses. Like any other cell, CD8+ T cells also produce extracellular particles. These include extracellular vesicles (EVs) and non-vesicular extracellular particles (NVEPs). T cell-derived EVs are proposed to mediate cell-to-cell signalling, especially in the context of inflammatory responses, autoimmunity, and infectious diseases. CD8+ T cells also produce supramolecular attack particles (SMAPs), which are in the same size range as EVs and mediate a component of T cell mediated killing. The isolation technique selected will have a profound effect on yield, purity, biochemical properties and function of T cell-derived particles; making it important to directly compare different approaches. In this study, we compared commonly used techniques (membrane spin filtration, ultracentrifugation, or size exclusion liquid chromatography) to isolate particles from activated human CD8+ T cells and validated our results by single-particle methods, including nanoparticle tracking analysis, flow cytometry, electron microscopy and super-resolution microscopy of the purified sample as well as bulk proteomics and lipidomics analyses to evaluate the quality and nature of enriched T cell-derived particles. Our results show that there is a trade-off between the yield and the quality of T cell-derived particles. Furthermore, the protein and lipid composition of the particles is dramatically impacted by the isolation technique applied. We conclude that from the techniques evaluated, size exclusion liquid chromatography offers the highest quality of T cell derived EVs and SMAPs with acceptable yields for compositional and functional studies.
