A methodological primer of extracellular vesicles isolation and characterization via different techniques

Area of Science:

• Biotechnology
• Cell Biology
• Biochemistry

Background:

• Extracellular vesicles (EVs) are crucial for intercellular communication.
• Standardized and accessible methods for EV isolation are needed for research.
• Current isolation techniques vary in complexity and effectiveness.

Purpose of the Study:

• To present four distinct, user-friendly protocols for isolating cell culture-derived EVs/exosomes.
• To provide adaptable methods suitable for various laboratory settings.
• To facilitate the selection of appropriate EV isolation techniques based on specific research conditions.

Main Methods:

• Polymer precipitation with polyethylene glycol and sodium chloride, followed by low-speed centrifugation.
• Ultracentrifugation of conditioned cell culture medium.
• Filtration of conditioned medium using a 100-kDa exclusion filter.
• Isolation using a commercial kit.

Main Results:

• Four protocols were detailed, ranging in complexity.
• Methods utilize polymer precipitation, filtration, ultracentrifugation, and size-exclusion chromatography (SEC).
• Purified EVs can be stored short-term at 4°C or long-term at -80°C.

Conclusions:

• The presented protocols offer researchers straightforward options for EV and exosome isolation.
• These methods can be further refined with techniques like sucrose density gradient centrifugation or SEC.
• The study aims to empower researchers to choose the most suitable isolation method for their specific experimental context.