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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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Isolation and Characterization of RNA-Containing Exosomes
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Extracellular exosomal RNAs are glyco-modified.

Sunny Sharma1, Xinfu Jiao2, Jun Yang2

  • 1Department of Cell Biology and Neurosciences, Rutgers University, Piscataway, NJ, USA. ssharma@dls.rutgers.edu.

Nature Cell Biology
|June 4, 2025
PubMed
Summary
This summary is machine-generated.

Researchers discovered unique, stable, glycosylated RNAs (glycoRNAs) within exosomes. These glycoRNAs are transferred between cells, suggesting a new form of intercellular communication and potential for diagnostics and RNA therapeutics.

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Area of Science:

  • RNA biology
  • Glycoscience
  • Cellular communication

Background:

  • Epitranscriptomic modifications regulate RNA functions.
  • RNA glycosylation is a newly identified modification with unclear functional roles.

Purpose of the Study:

  • To investigate the functional implications of RNA glycosylation.
  • To identify and characterize glycosylated RNAs in mammalian cells.

Main Methods:

  • Metabolic labeling using bioorthogonal probes.
  • Analysis of RNA modifications and localization within exosomes.
  • Inhibition of exosome biogenesis and protein glycosylation.

Main Results:

  • Discovery of small, stable, non-coding glycosylated RNAs (glycoRNAs).
  • GlycoRNAs found as intraluminal cargo in exosomes, resistant to RNases.
  • Exosomal glycoRNAs transferred to naive cells, indicating intercellular communication.
  • Glycosylation links protein and RNA modification in exosome cargo selection.

Conclusions:

  • Glycosylation plays a functional role in targeting RNA into exosomes.
  • Exosomal glycoRNAs mediate intercellular RNA communication.
  • Potential applications in exosome-based diagnostics and RNA therapeutics.