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Related Concept Videos

Overview of Exosomes01:36

Overview of Exosomes

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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...
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An Innovative Method for Exosome Quantification and Size Measurement
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Immuno-characterization of Exosomes Using Nanoparticle Tracking Analysis.

Kym McNicholas1, Michael Z Michael2,3

  • 1Flinders Centre for Innovation in Cancer, School of Medicine, Flinders University, PO Box 2100, Adelaide, SA, 5001, Australia.

Methods in Molecular Biology (Clifton, N.J.)
|December 13, 2016
PubMed
Summary

Accurate quantification of exosomes is crucial for their use as diagnostic biomarkers and therapeutic vectors. This study presents a method using nanoparticle tracking analysis and fluorescent markers to identify and quantify specific exosome subpopulations.

Keywords:
CD63ExosomesMicrovesiclesNanoSightQdots®Quantum dots

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Nanoparticle Tracking Analysis for the Quantification and Size Determination of Extracellular Vesicles
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Nanoparticle Tracking Analysis for the Quantification and Size Determination of Extracellular Vesicles

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Area of Science:

  • Extracellular vesicle research
  • Nanotechnology applications in biology
  • Biomarker discovery

Background:

  • Small extracellular vesicles, like exosomes, are challenging to identify and quantify due to their size.
  • Exosomes are increasingly recognized for their roles in intercellular signaling, disease diagnosis, and therapeutic delivery.
  • Accurate assessment of exosome number and cargo is vital for advancing vesicle research.

Purpose of the Study:

  • To describe a method for identifying and quantifying specific exosome subpopulations in biological samples.
  • To enable accurate characterization of vesicle size and concentration.
  • To facilitate the advancement of exosome-based diagnostics and therapeutics.

Main Methods:

  • Utilizing nanoparticle tracking analysis (NTA) to determine vesicle size and concentration.
  • Employing specific marker antibodies coupled to fluorescent quantum dots for exosome identification.
  • Characterizing subpopulations of vesicles within biological samples.

Main Results:

  • The described method allows for the identification of distinct exosome subpopulations.
  • The technique enables the determination of both size and concentration of these vesicles.
  • Successful characterization of exosomes using marker antibodies and fluorescent quantum dots.

Conclusions:

  • Nanoparticle tracking analysis, combined with specific antibody labeling, provides a robust method for exosome characterization.
  • This approach is essential for the accurate assessment of exosomes, supporting their diagnostic and therapeutic potential.
  • Further research into exosome quantification methods will accelerate progress in vesicle-based applications.