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In-Cell Labeling Coupled to Direct Analysis of Extracellular Vesicles in the Conditioned Medium to Study
Anissa Viveiros1,2, Vaibhavi Kadam1,2, John Monyror1,2
1Department of Pharmacology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB T6G 2H7, Canada.
Cells
|February 15, 2022
Summary
This study introduces an improved method for tracking extracellular vesicles (EVs) using in-cell fluorescent labeling and imaging flow cytometry. This technique enhances the detection of EV secretion changes in cell culture studies.
Area of Science:
- Cell Biology
- Biotechnology
- Nanotechnology
Background:
- Extracellular vesicles (EVs) are crucial in physiological processes and disease.
- Analyzing EVs in cell culture medium is challenging due to small particle size, lack of universal markers, and sample loss during labeling and separation.
- Current methods like size-exclusion chromatography and ultracentrifugation can lead to sample loss and technical artifacts.
Purpose of the Study:
- To develop and validate a method for in-cell labeling of EVs using fluorescent lipids.
- To enable direct analysis of labeled EVs in conditioned medium via imaging flow cytometry (IFC).
- To reduce sample processing and loss compared to traditional EV analysis techniques.
Main Methods:
- In-cell labeling of EVs with fluorescent lipids.
- Direct analysis of labeled EVs in conditioned medium using imaging flow cytometry (IFC).
- Comparison with established EV separation and labeling protocols.
Main Results:
- The in-cell labeling and IFC method significantly reduces sample processing and loss.
- This approach improves the detection of quantitative changes in EV secretion and subpopulations.
- The method offers better detection of EV changes compared to protocols relying on size-exclusion chromatography and ultracentrifugation.
Conclusions:
- In-cell EV labeling coupled with IFC provides an efficient method for EV analysis.
- This optimized protocol minimizes sample loss and processing, enhancing quantitative studies.
- The technique is well-suited for cell biology research focused on modulating EV secretion.
