Cited by 175Extracellular vesicles in diseaseMicroRNA in disease regulationRNA Interference and Gene Delivery

Role of Alix in miRNA packaging during extracellular vesicle biogenesis

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IAVELLO, ALESSANDRA, FRECH, VALESKA S.L., GAI, CHIARA, DEREGIBUS, MARIA CHIARA, QUESENBERRY, PETER J., CAMUSSI, GIOVANNI·2016·International Journal of Molecular Medicine

Abstract

Evidence indicates that Alix, an accessory protein of the endosomal sorting complex required for transport (ESCRT), is involved in the biogenesis of extracellular vesicles (EVs). EVs contain selected patterns of microRNAs (miRNAs or miRs); however, little is known about the mechanisms of miRNA enrichment in EVs. The aim of the present study was to evaluate whether Alix is involved in the packaging of miRNAs within EVs released by human liver stem‑like cells (HLSCs). EVs released from HLSCs were enriched with miRNAs and expressed Alix and several RNA-binding proteins, including Argonaute 2 (Ago2), a member of the Argonaute family known to be involved in the transport and the processing of miRNAs. Co-immunoprecipitation experiments revealed an association between Alix and Ago2. The results from RT-qPCR indicated that in the Alix/Ago2 immunoprecipitates, miRNAs were detectable. EVs were instrumental in transferring selected miRNAs from HLSCs to human endothelial cells absent in the latter cells. Alix knockdown did not influence the number of EVs released by HLSCs, but it significantly decreased miRNA expression levels in the EVs and consequently their transfer to the endothelium. Our findings indicate that Alix binds to Ago2 and miRNAs, suggesting that it plays a key role in miRNA enrichment during EV biogenesis. These results may represent a novel function of Alix, demonstrating its involvement in the EV-mediated transfer of miRNAs.

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  • The involvement of Alix for EV release seems to occur only in muscle cells, as knockdown of Alix did not affect the number of ELVs released from human liver stem-like cells.

    “Interestingly, the involvement of Alix for EV release seems to occur only in muscle cells as the knockdown of Alix did not affect the number of ELVs released from human liver stem-like cells (Iavello et al., 2016).”

    From Skeletal Muscle-Released Extracellular Vesicles: State of the Art (2019) · cites this paper as Iavello et al., 2016

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Authors
IAVELLO, A., FRECH, V. S. L., GAI, C., DEREGIBUS, M. C., QUESENBERRY, P. J., & CAMUSSI, G.
Affiliations
  • University of Turin (IT)
  • Brown University (US)
Corresponding author
CAMUSSI, GIOVANNI
Venue
International Journal of Molecular Medicine
Published
2016-02-12
Volume
37
Issue
4
Pages
958-966
ISSN
  • 1107-3756 (ISSN-L)
  • 1791-244X
OpenAlex
W2259035271
Cited by
175
References
52
Citations by year
2026: 16 · 2025: 15 · 2024: 25 · 2023: 20 · 2022: 15 · 2021: 19 · 2020: 24 · 2019: 13 · 2018: 7 · 2017: 18 · 2016: 3
FWCI
7.11
Type
journal article
Language
en
Open access
Licence
cc-by-nc-nd
Locations
  • International Journal of Molecular Medicine (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • Associazione Italiana per la Ricerca sul Cancro (12890, IG 12890)
  • National Institutes of Health (UH2TR000880, UH3TR000880)
  • National Center for Advancing Translational Sciences
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Interference and Gene Delivery
Keywords
Alix, extracellular vesicles, extracellular vesicle biogenesis, Argonaute 2, ESCRT, endothelial cells, protein-protein interaction
MeSH terms
Extracellular Vesicles, Calcium-Binding Proteins, Cell Line, Gene Expression Regulation, Humans, Liver, Stem Cells, Cell Cycle Proteins, Hepatocytes, MicroRNAs, Immunoprecipitation, Gene Knockdown Techniques, Endosomal Sorting Complexes Required for Transport, Argonaute Proteins, Human Umbilical Vein Endothelial Cells

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