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Personal identity is the deeply felt sense of self that individuals cultivate over time, intricately woven from intrinsic qualities they consider essential to their existence—qualities such as morality, intelligence, and friendliness. These attributes serve as vital internal benchmarks, guiding individuals in evaluating whether their actions resonate with their true selves.When personal identity takes center stage in one's life, individuals often emphasize their distinctiveness,...
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Related Experiment Video

Updated: Jan 21, 2026

Scalable Isolation and Purification of Extracellular Vesicles from Escherichia coli and Other Bacteria
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Isolation Defines Identity: Functional Consequences of Extracellular Vesicle Purification Strategies.

Christian Preußer1,2, Dolores J Salander1,2, Witold Szymanski3

  • 1EV-iTEC Core Facility, Center for Tumor Biology and Immunology, Marburg University, Marburg, Germany.

Advanced Healthcare Materials
|January 20, 2026
PubMed
Summary
This summary is machine-generated.

Different methods for isolating extracellular vesicles (EVs) significantly alter their protein content and enzymatic activity. Understanding these impacts is crucial for developing reliable EV-based diagnostics and therapeutics.

Keywords:
ADAM10 activityMISEV2023extracellular vesiclesproteomestandardization

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biotechnology

Background:

  • Extracellular vesicles (EVs) are crucial for intercellular communication, with their biological activity dictated by molecular cargo.
  • The influence of isolation techniques on EV proteomes and functions is not fully understood, hindering reliable applications.

Purpose of the Study:

  • To compare four distinct EV isolation workflows.
  • To assess the impact of these workflows on EV yield, particle characteristics, protein cargo, and enzymatic activity.
  • To provide methodological insights for EV biomarker and therapeutic development.

Main Methods:

  • EVs were isolated from ovarian cancer ascites and cell culture supernatants using four different strategies.
  • Proteomic analysis followed MISEV2023 guidelines for particle-normalized preparations.
  • EV-associated protease activity was measured using FRET assays and inhibitor panels.

Main Results:

  • A common EV proteome signature was identified for ascites and cell-derived EVs, with additional proteins detected based on the isolation workflow.
  • Ultracentrifugation/density gradient (UC-DG) and tangential flow filtration/size exclusion chromatography (TFF-SEC) yielded EVs with higher canonical marker enrichment.
  • TFF-SEC and UC-DG demonstrated strong ADAM10 activity, while TFF/ultrafiltration (TFF-UF) showed residual non-metalloprotease activity and enrichment in lipoproteins.

Conclusions:

  • EV isolation methods significantly impact EV composition and functional enzymatic activity.
  • Methodological awareness is essential for advancing EV-based biomarker discovery, diagnostics, and therapeutics.
  • Standardized EV isolation protocols are needed for reproducible results in clinical and research settings.