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Isolation of Tissue Extracellular Vesicles from the Liver
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Matrix-Bound Nanovesicles: The Effects of Isolation Method upon Yield, Purity, and Function.

Lina M Quijano1,2, Juan D Naranjo1,2, Salma O El-Mossier1

  • 1McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.

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Summary

Harvesting matrix-bound nanovesicles (MBV) from the extracellular matrix (ECM) requires careful method selection. Liberase or collagenase followed by size exclusion chromatography (SEC) yielded the best MBV for theranostic applications.

Keywords:
extracellular matrixextracellular vesiclesmatrix-bound nanovesicles

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biotechnology

Background:

  • Matrix-bound nanovesicles (MBV) are integral components of the extracellular matrix (ECM).
  • Their tight association with the ECM poses challenges for isolation and characterization.
  • Understanding MBV functions and theranostic potential is hindered by variable harvesting methods.

Purpose of the Study:

  • To compare the impact of different MBV harvesting methods on yield, purity, and biological activity.
  • To identify optimal solubilization and isolation techniques for MBV.
  • To evaluate the influence of harvesting on MBV integrity for theranostic applications.

Main Methods:

  • Investigated combinations of ECM solubilization (collagenase, liberase, proteinase K, KCl elution) and MBV isolation (ultracentrifugation, ultrafiltration, density barrier, SEC).
  • Isolated MBV from urinary bladder-derived ECM.
  • Assessed yield, purity, cellular uptake, and biological activity of harvested MBV.

Main Results:

  • All tested combinations yielded MBV, but with significant variations.
  • Liberase or collagenase followed by SEC produced MBV with the highest yield, purity, cellular uptake, and biological activity.
  • Proteinase K combined with ultrafiltration negatively impacted MBV bioactivity.

Conclusions:

  • The choice of MBV harvesting method critically influences sample quality and biological relevance.
  • Optimized methods are essential for accurate MBV characterization and evaluation of their theranostic potential.
  • Minimizing ECM remnant and solubilization agent contamination is key for future MBV studies.