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Delineating Bovine Milk Derived Microvesicles from Exosomes Using Proteomics.

Andrew D Couse1, Sarah J Cox-Vazquez1, Subhadip Ghatak2

  • 1Department of Chemistry, Indiana University Bloomington, Bloomington, Indiana 47405, United States.

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Summary

Researchers developed a new method to analyze extracellular vesicle (EV) populations in bovine milk using proteomics. This technique differentiates large and small EVs, identifying distinct protein markers for each, aiding in understanding vesicle origins.

Keywords:
bovine milkexosomeextracellular vesicleliquid chromatography−tandem mass spectrometry (LC−MS/MS)microvesicleprotein profilingproteomicsultracentrifugation

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Area of Science:

  • Proteomics
  • Extracellular Vesicles
  • Biochemistry

Background:

  • Extracellular vesicles (EVs) in bovine milk are complex and their distinct populations are not well characterized.
  • Understanding EV heterogeneity is crucial for their potential applications in diagnostics and therapeutics.

Purpose of the Study:

  • To develop and validate a serial-pelleting purification strategy coupled with mass spectrometry-based proteomics.
  • To differentiate and characterize protein compositions of large EVs (>200 nm) and small EVs (<200 nm) in bovine milk.

Main Methods:

  • Serial-pelleting ultracentrifugation to fractionate EV populations based on size.
  • Mass spectrometry-based proteomics for comprehensive protein identification and quantification.
  • Development of a metric to quantify relative protein abundances in large versus small EVs.

Main Results:

  • Identified 476 consistently found proteins, with 340 associated with vesicular components.
  • Of vesicular proteins, 156 were enriched in large EVs, 155 shared, and 29 in small EVs.
  • Distinguished between vesicular and non-vesicular proteins, and identified distinct protein profiles for large (cytosolic enzymes) and small EVs (membrane-bound proteins).

Conclusions:

  • The developed method effectively distinguishes between large and small EV populations in bovine milk.
  • The study identified distinct protein markers specific to large and small EVs, offering insights into their origins.
  • This approach provides a valuable tool for assessing vesicle component origins and discovering novel EV biomarkers.