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Multimodal Analytical Platform on a Multiplexed Surface Plasmon Resonance Imaging Chip for the Analysis of Extracellular Vesicle Subsets
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Extracellular Vesicle Antibody Microarray for Multiplexed Inner and Outer Protein Analysis.

Rosalie Martel1,2, Molly L Shen1,2, Philippe DeCorwin-Martin1,2

  • 1Biomedical Engineering Department, McGill University, Montreal, Quebec H3A 2B4, Canada.

ACS Sensors
|December 14, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces EVPio, a new method for high-throughput analysis of extracellular vesicle (EV) proteins, enabling simultaneous detection of both inner and outer EV proteins for improved biomarker discovery.

Keywords:
barcodingbranched DNA amplificationextracellular vesiclesmicroarraysprotein analysis

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Proteins on extracellular vesicles (EVs) are crucial for their function and serve as biomarkers for disease.
  • Analyzing outer EV proteins is established, but co-profiling inner EV proteins remains a challenge.

Purpose of the Study:

  • To develop a high-throughput, multiplexed assay for simultaneous analysis of inner and outer EV proteins.
  • To enable comprehensive protein profiling of EVs for discovery and clinical applications.

Main Methods:

  • Optimization of EV fixation and heat-induced protein epitope retrieval.
  • Utilized oligo-barcoded antibodies and branched DNA signal amplification for sensitive detection.
  • Developed the extracellular vesicle protein inner and outer (EVPio) analysis method.

Main Results:

  • Successfully captured and analyzed four EV subpopulations from colorectal cancer cell lines.
  • Quantified co-expression of eight outer (integrins, tetraspanins) and four inner proteins.
  • Observed co-expression patterns consistent with known biological functions.

Conclusions:

  • EVPio analysis allows simultaneous detection of multiple inner and outer EV proteins on a surface.
  • This method facilitates extensive combinatorial protein profiling of EVs.
  • EVPio holds potential for both discovery research and clinical translation of EV biomarkers.