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Sizing Extracellular Vesicles Using Membrane Dyes and a Single Molecule-Sensitive Flow Analyzer.

Luca A Andronico1, Yifei Jiang1, Seung-Ryoung Jung1

  • 1Department of Chemistry, University of Washington, Seattle 98195, Washington, United States.

Analytical Chemistry
|March 30, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a fluorescence-based flow analyzer for precise sizing of extracellular vesicles (EVs). The method achieves high accuracy in measuring EV sizes, crucial for understanding cell signaling.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Nanotechnology

Background:

  • Extracellular vesicles (EVs) mediate cell-to-cell communication.
  • Accurate sizing of nanoscale EVs is essential for understanding their biophysical properties.
  • Current methods face challenges due to EV size heterogeneity and nanometer dimensions.

Purpose of the Study:

  • To develop and validate a single-molecule sensitive fluorescence-based flow analyzer for extracellular vesicle (EV) sizing.
  • To establish a method for accurate measurement of EV sizes within the range of approximately 35-300 nm.
  • To improve the precision and accuracy of EV sizing through signal correction techniques.

Main Methods:

  • Utilized a fluorescence-based flow analyzer with single-molecule sensitivity.
  • Employed a membrane-selective dye where fluorescence intensity correlates with vesicle diameter.
  • Implemented a speed-correction method based on particle transit time through a laser beam at a 10 kHz sampling rate.

Main Results:

  • Demonstrated that vesicle fluorescence intensity is proportional to its diameter.
  • Optimized staining and sample preparation for consistent nanoscale vesicle sizing.
  • Achieved a threefold increase in accuracy for EV sizing, with a precision of ±15-25% after speed correction.

Conclusions:

  • The developed fluorescence-based flow analysis provides a sensitive method for sizing extracellular vesicles (EVs).
  • The speed-correction technique significantly enhances the accuracy and precision of EV size measurements.
  • This method offers a valuable tool for investigating the biophysical characteristics of EVs.