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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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Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
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Gap Junctions
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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Related Experiment Video

Updated: Jan 12, 2026

Extraction of Extracellular Vesicles from Whole Tissue
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Exploring the Spatial Limits of Extracellular Vesicles-Mediated Intercellular Communication.

Federico Colombo1,2, Kartik Nimkar1,2, Erienne Grace Norton1,2,3

  • 1Division of Pharmaceutics and Pharmacology, College of Pharmacy, The Ohio State University, Columbus, Ohio, USA.

Journal of Extracellular Vesicles
|October 30, 2025
PubMed
Summary
This summary is machine-generated.

Extracellular vesicles (EVs) act as short-range messengers, not long-range communicators. Cell density significantly impacts EV diffusion, with higher density restricting their spread by promoting uptake by nearby cells.

Keywords:
cancerexosomesextracellular vesiclesintercellular communicationlattice light sheet microscopyliquid biopsylive cell microscopytumour microenvironment

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Area of Science:

  • Cell Biology
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Extracellular vesicles (EVs) are key mediators of intercellular communication.
  • Their potential in diagnostics and drug delivery is significant, but release and distribution mechanisms are poorly understood.
  • Understanding EV diffusion is crucial for harnessing their therapeutic and diagnostic capabilities.

Purpose of the Study:

  • To define the major determinants of extracellular vesicle (EV) diffusion.
  • To investigate the role of cell density in EV dissemination and intercellular communication.
  • To challenge the notion of EVs as long-range messengers.

Main Methods:

  • High-resolution live-cell imaging.
  • Quantitative analytical methods.
  • In vivo mouse models to study EV diffusion dynamics.

Main Results:

  • Cell density critically influences EV dissemination.
  • Sparsely distributed cells show higher EV release rates.
  • Densely packed cells restrict EV diffusion through enhanced internalization and degradation by adjacent cells.

Conclusions:

  • EVs function primarily as short-range communication agents within their tissue of origin.
  • The prevailing assumption of EVs as long-range messengers is challenged.
  • Findings have significant implications for EV-based diagnostics and therapeutics.