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Tracking miRNA Release into Extracellular Vesicles using Flow Cytometry.

Humna Hasan1, Andrea L Kasinski2

  • 1Department of Biological Sciences, Purdue University.

Journal of Visualized Experiments : Jove
|October 23, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a flow cytometry protocol to track microRNA (miRNA) loading into extracellular vesicles (EVs). The method visualizes miRNA export dynamics, aiding in understanding EV communication.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Extracellular vesicles (EVs) mediate intercellular communication by transferring bioactive molecules, including microRNAs (miRNAs).
  • miRNAs within EVs play crucial roles in recipient cell function and are often dysregulated in disease.
  • Mechanisms and dynamics of miRNA sorting and export into EVs remain incompletely understood.

Purpose of the Study:

  • To present a novel protocol for analyzing the dynamics of EV-miRNA loading.
  • To identify the cellular machinery involved in miRNA export into EVs.
  • To offer a method for assessing miRNA sorting into extracellular vesicles.

Main Methods:

  • Fluorescently tagging specific miRNAs for enrichment in EVs and depletion from donor cells.
  • Transfecting tagged miRNAs into donor cells and monitoring their distribution using flow cytometry.
  • Quantifying miRNA loading into EVs and cellular depletion via qRT-PCR.
  • Utilizing a fluorescently labeled cellular RNA as a transfection control.

Main Results:

  • The protocol successfully visualizes miRNA loading into EVs and depletion from cells.
  • Fluorescence signal intensity specific for EV-miRNAs diminished rapidly compared to cell-retained miRNAs over 72 hours.
  • The method allows for the assessment of miRNA export dynamics.

Conclusions:

  • This flow cytometry-based protocol provides a straightforward approach to study EV-miRNA loading dynamics.
  • The method can be used to identify factors and machinery responsible for miRNA export into EVs.
  • Understanding EV-miRNA transport is critical for deciphering cellular communication and disease mechanisms.