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Overview of Exosomes

Overview of Exosomes

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.
Stahl et al. discovered exosomes in 1983, but the exosomes were initially considered waste products released from the...

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Related Experiment Video

Updated: May 14, 2026

Purification and Transplantation of Myogenic Progenitor Cell Derived Exosomes to Improve Cardiac Function in Duchenne Muscular Dystrophic Mice

Purification and Transplantation of Myogenic Progenitor Cell Derived Exosomes to Improve Cardiac Function in Duchenne Muscular Dystrophic Mice

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Cardiac myocyte exosomes: stability, HSP60, and proteomics.

Z A Malik¹, K S Kott, A J Poe

¹Molecular and Cellular Cardiology, Department of Medicine, University of California, Davis, CA 95616, USA.

American Journal of Physiology. Heart and Circulatory Physiology

|February 5, 2013

Summary

Cardiac myocytes release exosomes containing heat shock protein 60. Ethanol increases exosome production, influenced by reactive oxygen species (ROS), impacting intercellular communication.

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Last Updated: May 14, 2026

Purification and Transplantation of Myogenic Progenitor Cell Derived Exosomes to Improve Cardiac Function in Duchenne Muscular Dystrophic Mice

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Published on: September 15, 2023

Area of Science:

Cell Biology
Biochemistry
Cardiovascular Research

Background:

Exosomes mediate intercellular communication and can transmit malignancy or viral particles.
Extracellular heat shock protein 60 (HSP60) outside exosomes induces cardiac myocyte apoptosis.
Cardiac myocytes release HSP60 within exosomes, raising questions about exosome stability and cargo release.

Purpose of the Study:

To investigate how environmental changes affect exosome permeability and protein content.
To determine if ethanol influences exosome release and production.
To explore the role of reactive oxygen species (ROS) in exosome production.

Main Methods:

Western blot analysis to assess exosome protein cargo stability.
Mass spectrometry to characterize the protein content of cardiac exosomes.
Cell culture experiments with ethanol and hypoxia/reoxygenation to induce exosome release.
ROS inhibition studies to evaluate its role in exosome production.

Main Results:

Exosomes maintained protein cargo integrity under various physiological/pathological conditions.
Cardiac exosomes possess unique protein profiles, including cytosolic, sarcomeric, and mitochondrial proteins.
Ethanol significantly increased exosome production by cardiac myocytes without affecting stability.
Ethanol- and hypoxia/reoxygenation-induced exosomes exhibited distinct protein compositions.
ROS inhibition partially reduced, but did not eliminate, ethanol-induced exosome production.

Conclusions:

Exosome protein content is determined by the cell source and the stimulus for formation.
Reactive oxygen species (ROS) play a significant role in stimulating exosome production.
The precise functions of exosomes in cardiac myocytes require further investigation.