Cited by 2,975Extracellular vesicles in diseaseCellular transport and secretionNanoparticle-Based Drug Delivery

Reassessment of exosome composition

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Jeppesen, Dennis K., Fenix, Aidan M., Franklin, Jeffrey L., Higginbotham, James N., Zhang, Qin, Zimmerman, Lisa J., Liebler, Daniel C., Ping, Jie +7 more·2019·Cell

Abstract

The heterogeneity of small extracellular vesicles and presence of non-vesicular extracellular matter have led to debate about contents and functional properties of exosomes. Here, we employ high-resolution density gradient fractionation and direct immunoaffinity capture to precisely characterize the RNA, DNA, and protein constituents of exosomes and other non-vesicle material. Extracellular RNA, RNA-binding proteins, and other cellular proteins are differentially expressed in exosomes and non-vesicle compartments. Argonaute 1-4, glycolytic enzymes, and cytoskeletal proteins were not detected in exosomes. We identify annexin A1 as a specific marker for microvesicles that are shed directly from the plasma membrane. We further show that small extracellular vesicles are not vehicles of active DNA release. Instead, we propose a new model for active secretion of extracellular DNA through an autophagy- and multivesicular-endosome-dependent but exosome-independent mechanism. This study demonstrates the need for a reassessment of exosome composition and offers a framework for a clearer understanding of extracellular vesicle heterogeneity.

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Crossref · 10.1016/j.cell.2019.02.029

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Authors
Jeppesen, D. K., Fenix, A. M., Franklin, J. L., Higginbotham, J. N., Zhang, Q., Zimmerman, L. J., Liebler, D. C., Ping, J., Liu, Q., Evans, R., Fissell, W. H., Patton, J. G., Rome, L. H., Burnette, D. T., & Coffey, R. J.
Affiliations
  • Vanderbilt University Medical Center (US)
  • Vanderbilt University (US)
  • California NanoSystems Institute (US)
Corresponding author
Coffey, Robert J.
Venue
Cell
Publisher
Elsevier BV
Published
2019-04
Volume
177
Issue
2
Pages
428-445.e18
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2933304441
Cited by
2,975
References
61
Citations by year
2026: 317 · 2025: 422 · 2024: 491 · 2023: 447 · 2022: 433 · 2021: 426 · 2020: 334 · 2019: 100 · 2013: 2
FWCI
107.09
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • Vanderbilt-Ingram Cancer Center (CA68485)
  • National Institutes of Health (R35 CA197570, F31 HL136081, U01-EB021214, R35 GM125028, U19 CA179514, DK20593, EY08126, DK59637, P30 DK058404, CA68485)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Physical Sciences › Materials Science › Biomaterials › Nanoparticle-Based Drug Delivery
Keywords
exosomes, small extracellular vesicles, extracellular RNA, extracellular DNA, exosome composition, microvesicles, annexin A1, autophagy, multivesicular bodies, RNA-binding proteins, density gradient fractionation, immunoaffinity capture
MeSH terms
Extracellular Vesicles, Cell Membrane, DNA, Female, Humans, Lysosomes, Male, Proteins, RNA, Annexin A1, Cell Line, Tumor, Cell-Derived Microparticles, Exosomes, Argonaute Proteins

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