Single Extracellular Vesicle Transmembrane Protein Characterization by Nano-Flow Cytometry

Area of Science:

• Biotechnology
• Nanotechnology
• Cell Biology

Background:

• Extracellular vesicles (EVs) research has shifted from bulk analysis to single particle characterization.
• Nano-flow cytometry (nFCM) represents a significant advancement, enabling high-throughput multi-parameter EV analysis.

Purpose of the Study:

• To demonstrate the capability of nFCM for comprehensive, quantitative single particle characterization of extracellular vesicles.
• To validate nFCM's utility with common EV markers and standards.

Main Methods:

• Utilized nFCM with high-resolution side scatter (SS) for size/concentration and fluorescence (FL) detection for marker identification.
• Analyzed extracellular vesicles from conditioned cell culture media labeled with lipid dye and antibodies (CD9, CD63, CD81).
• Employed silica nanosphere standards for calibration and validation.

Main Results:

• nFCM accurately determined size and concentration of particles >45 nm via SS detection.
• Simultaneous FL detection quantified labeled subpopulations (e.g., CD9+, CD63+, CD81+) in particles/mL.
• Characterized EVs from conditioned cell culture media in a 1-minute analysis.

Conclusions:

• nFCM provides a powerful, flexible platform for quantitative single particle analysis of EVs.
• This technique allows for detailed characterization of EV subpopulations using various labeling strategies.
• nFCM advances extracellular vesicle research through precise, high-throughput measurements.