sEV-ICP-TOF-MS for Multiparametric Single-EV Analysis via Nanoparticle-Conjugated Antibodies and Isotope Ratio...

Area of Science:

• Biotechnology
• Analytical Chemistry
• Cell Biology

Background:

• Extracellular vesicles (EVs) are crucial for intercellular communication, diagnostics, and therapeutics.
• Traditional methods struggle with EV detection due to their small size, heterogeneity, and interference from other nanoparticles.
• Accurate detection and characterization of EVs are essential for their clinical applications.

Purpose of the Study:

• To develop a novel technique for sensitive and specific detection and characterization of single extracellular vesicles (EVs).
• To overcome limitations of traditional methods in quantifying and profiling EVs.
• To enable high-resolution, multiparametric analysis of EV subpopulations.

Main Methods:

• Introduction of a single-EV inductively coupled plasma time-of-flight mass spectrometry (sEV-ICP-TOF-MS) technique.
• Integration of mass cytometry with nanoparticle-conjugated antibodies for enhanced detection sensitivity.
• Implementation of isotope ratio filtering to improve signal specificity and distinguish EV signals from background noise.

Main Results:

• Nanoparticle-conjugated antibodies significantly increased detection sensitivity for EVs with low-abundance surface markers.
• Isotope ratio filtering reduced the limit of detection (LOD) by over 36-fold to 2.07 × 10^4 particles/mL.
• Multiparametric profiling revealed a bimodal distribution of CD9+CD63+ coexpression, highlighting EV subpopulation heterogeneity.

Conclusions:

• The novel sEV-ICP-TOF-MS technique offers enhanced sensitivity and specificity for single-EV detection and profiling.
• This scalable approach holds significant potential for biomarker discovery, disease diagnostics, and advancing EV biology research.
• The method enables high-resolution, multiparametric analysis crucial for understanding EV heterogeneity.