Related Experiment Video
Updated: Apr 12, 2026
07:15
Purification of High Yield Extracellular Vesicle Preparations Away from Virus
Published on: September 12, 2019
12.5K
Heparin affinity purification of extracellular vesicles
Leonora Balaj1, Nadia A Atai2, Weilin Chen1
1Department of Neurology, Massachusetts General Hospital and Program in Neuroscience, Harvard Medical School, Boston, MA.
Scientific Reports
|May 20, 2015
Summary
Researchers developed a simple method to purify extracellular vesicles (EVs) using ultrafiltration and heparin-affinity beads. This technique offers a scalable and effective way to isolate functional EVs from cell culture and plasma, improving upon ultracentrifugation.
Area of Science:
- Biotechnology
- Cell Biology
- Molecular Biology
Background:
- Extracellular vesicles (EVs) are crucial for intercellular communication, carrying biomolecules like RNA and proteins.
- Current isolation methods, such as ultracentrifugation (UC), are often inefficient, costly, and yield impure EV preparations.
- Understanding EV biology is hindered by challenges in obtaining pure and functional EV samples.
Purpose of the Study:
- To develop a simple, scalable, and effective method for purifying extracellular vesicles (EVs).
- To leverage the heparin-binding properties of EVs for improved isolation.
- To compare the purity, yield, and functionality of EVs isolated by the new method versus traditional UC.
Main Methods:
- Ultrafiltration (UF) of cell culture media and human plasma.
- Heparin-affinity chromatography using heparin-coated beads for EV capture.
- Characterization of purified EVs using markers (e.g., Alix), RNA profiling, protein contamination assessment, and functional assays.
- Comparison with EVs isolated via ultracentrifugation (UC).
Main Results:
- The UF/heparin method successfully purified EVs from cell culture media and human plasma.
- Purified EVs exhibited the EV marker Alix and contained diverse RNA profiles.
- This method resulted in lower protein contamination compared to UC.
- Isolated EVs demonstrated functionality in cell binding and uptake assays.
- RNA yield was comparable to UC, and plasma mRNA levels were similar to UC-isolated samples.
Conclusions:
- A novel, simple, scalable, and effective method for purifying extracellular vesicles (EVs) has been established.
- The UF/heparin-affinity method offers an advantageous alternative to traditional UC for EV isolation.
- This technique facilitates the isolation of functional EVs with reduced contamination, advancing EV research and applications.
