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Area of Science:

  • Biotechnology
  • Nanomedicine
  • Cell Biology

Background:

  • Extracellular vesicles (EVs) are natural nanoparticles mediating intercellular communication.
  • EVs hold therapeutic potential but require reliable dosing strategies for clinical translation.
  • Current EV production and characterization lack standardization, hindering therapeutic development.

Purpose of the Study:

  • To analyze EV dosing strategies in pre-clinical studies of EV-based therapeutics.
  • To identify inconsistencies and challenges in current EV dosing methodologies.
  • To propose a more reliable approach for EV therapeutic dosing.

Main Methods:

  • Systematic review of 64 pre-clinical studies on EV-based therapeutics.
  • Analysis of applied EV dosing strategies, purification methods, and cell sources.
  • Evaluation of dose selection in relation to disease models, pharmacokinetics, and biodistribution.

Main Results:

  • Significant variations in EV dosing strategies were observed, independent of purification method or cell source.
  • EV doses were often selected without considering pharmacokinetic or biodistribution data.
  • Discrepancies in dosing were noted across different disease models.

Conclusions:

  • A shift towards qualitative dosing, focusing on therapeutic cargo potency, is proposed for EVs.
  • This approach can enhance batch-to-batch reliability and inter-application reproducibility.
  • Qualitative dosing will facilitate benchmarking of EV therapeutics against other nanoparticle delivery systems.