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Extracellular Vesicle Uptake Assay via Confocal Microscope Imaging Analysis
Published on: February 14, 2022
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Evaluation of extracellular vesicle aggregation by single vesicle analysis
Johan Yi1, Suyeon Kim2, Chungmin Han2,3
1Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyeongbuk, the Republic of Korea. jpark@postech.ac.kr.
The Analyst
|November 5, 2024
Summary
This study introduces a new method, single vesicle analysis (SVA), to quantify extracellular vesicle (EV) aggregation. This technique helps understand how EV aggregation impacts their function and how to control it.
Area of Science:
- Biotechnology
- Cell Biology
- Nanotechnology
Background:
- Extracellular vesicles (EVs) are crucial for intercellular communication.
- EV aggregation significantly impacts their biological functions and therapeutic potential.
- Current methods for assessing EV aggregation are limited.
Purpose of the Study:
- To develop and validate a quantitative method for assessing EV aggregation.
- To investigate factors influencing EV aggregation, including isolation and storage.
- To evaluate the effectiveness of EV aggregate removal techniques.
Main Methods:
- Utilized total internal reflection fluorescence microscopy (TIRFm) for single vesicle analysis (SVA).
- Employed two-colored fluorescently labeled EVs to distinguish aggregated from non-aggregated particles.
- Calculated an aggregation ratio based on fluorescence signal colocalization.
Main Results:
- The SVA method accurately quantifies EV aggregation.
- Isolation methods, storage conditions, and biochemical factors (salt, pH, antibodies) affect EV aggregation.
- Significant variability exists in the efficacy of different aggregate removal methods.
Conclusions:
- SVA provides a robust platform for characterizing EV aggregation dynamics.
- Understanding EV aggregation is critical for reliable EV-based diagnostics and therapeutics.
- This approach may establish a new standard for EV characterization.
