Next Generation Aqueous Two-Phase System for Gentle, Effective, and Timely Extracellular Vesicle Isolation and...

Area of Science:

• Biotechnology
• Molecular Biology
• Cell Biology

Background:

• Current extracellular vesicle (EV) isolation methods often sacrifice purity and yield for speed.
• Existing techniques like ultracentrifugation (UC) and commercial kits have limitations in efficiency and scalability.

Purpose of the Study:

• To develop and validate a next-generation aqueous two-phase system (next-gen ATPS) for superior EV isolation.
• To demonstrate the efficacy of next-gen ATPS in enhancing EV purity, yield, and downstream analytical applications.

Main Methods:

• Utilized a next-generation aqueous two-phase system (next-gen ATPS) employing polyethylene glycol (PEG) and dextran (DEX) phases.
• Isolated EVs by exploiting their preferential migration to the DEX-rich phase.
• Incorporated dextranase to facilitate TRIzol RNA isolation and improve immunoreactivity for nanoscale flow cytometry (nFC).

Main Results:

• Next-gen ATPS demonstrated superior EV isolation yield and purity compared to UC and commercial kits.
• Isolated EVs showed enhanced suitability for biomarker analysis via nFC using pre-conjugated antibodies (CD9, CD63, CD81).
• Transcriptomic analysis revealed high overlap in RNA profiles (miRNA, circRNA, snoRNA) with donor cells and other isolation methods, with superior circRNA detection.

Conclusions:

• Next-gen ATPS offers a rapid, scalable, and highly effective method for isolating high-quality EVs.
• This approach optimizes the extraction and analysis of EV-encapsulated nucleic acids, negating the need for specialized kits.
• The method significantly advances EV research by improving isolation efficiency and downstream analysis capabilities.