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A cell-based assay for CD63-containing extracellular vesicles.

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Researchers developed a novel assay to quantify extracellular vesicle (EV) release using Nanoluciferase-tagged CD63. V-ATPase inhibitors significantly increased EV secretion, offering new insights into EV release mechanisms.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Biotechnology

Background:

  • Extracellular vesicles (EVs) are crucial for intercellular communication and hold potential as disease biomarkers.
  • Quantitative methods for studying EV release mechanisms are limited.
  • CD63 is a tetraspanin enriched in EVs.

Purpose of the Study:

  • To develop a quantitative cell-based assay for monitoring EV release.
  • To investigate cellular machinery and chemical compounds influencing EV secretion.
  • To identify pathways regulating the release of CD63-containing EVs.

Main Methods:

  • A cell-based assay was established using CD63 fused to Nanoluciferase to monitor EV release.
  • Luciferase activity in culture media and cells was compared to quantify released EVs.
  • A chemical screen was performed on HEK293 cells to identify modulators of EV release.

Main Results:

  • The assay successfully quantified EV release from various cell lines (HEK293, U2OS, U87, SKMel28), with release rates ranging from 0.3% to 0.6% of total CD63 over 5 hours.
  • V-ATPase inhibitors (bafilomycin, concanamycin) significantly increased CD63-containing EV release.
  • Endosomal alkalization did not affect EV release, suggesting a pH-independent mechanism for V-ATPase inhibitor-induced release.

Conclusions:

  • The developed Nanoluciferase-based assay provides a quantitative method to study EV release kinetics.
  • V-ATPase inhibition enhances EV secretion through a pH-independent pathway.
  • This assay platform will facilitate future genetic and chemical screens to elucidate EV biogenesis and release pathways.