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Updated: Jun 9, 2025
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Direct Stochastic Optical Reconstruction Microscopy of Extracellular Vesicles in Three Dimensions
Published on: August 26, 2021
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Optical Imaging of Single Extracellular Vesicles: Recent Progress and Prospects
Bochen Ma1,2, Li Li2,3, Yuting Bao2,3
1School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China.
Chemical & Biomedical Imaging
|October 30, 2024
Summary
Advanced optical imaging techniques enable detailed characterization of extracellular vesicles (EVs). These methods overcome challenges in analyzing EV heterogeneity, cargo, and function for disease biomarker and drug delivery applications.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Nanotechnology
Background:
- Extracellular vesicles (EVs) are vital for intercellular communication and biomolecule transfer.
- EVs hold promise as disease biomarkers and drug delivery vehicles.
- Characterizing EVs is challenging due to their small size, low payload, and heterogeneity.
Purpose of the Study:
- To review recent advances in optical imaging for single extracellular vesicle (EV) analysis.
- To highlight methods for EV labeling, characterization, and biological insights.
- To discuss current limitations and future prospects in the field.
Main Methods:
- Single-molecule fluorescence imaging
- Single-particle dark-field imaging
- Surface-enhanced Raman scattering (SERS)
- Surface plasmon resonance (SPR) imaging
Main Results:
- Optical imaging techniques enable detection and analysis of individual EVs.
- EV cargo analysis provides insights into protein/nucleic acid expression and EV subgroups.
- Superresolution mapping and single EV tracking reveal EV structure, release, and uptake mechanisms.
Conclusions:
- Sensitive optical imaging methods are crucial for overcoming EV characterization challenges.
- Advances in single EV analysis offer new possibilities for biomarker discovery and therapeutic applications.
- Further development is needed to address limitations and enhance the utility of optical imaging for EVs.
