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A Human Ex Vivo Atherosclerotic Plaque Model to Study Lesion Biology
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Exosomes in human atherosclerosis: An ultrastructural analysis study.

Ida Perrotta1, Saveria Aquila2

  • 1a Department of Biology , Ecology and Earth Sciences, University of Calabria , Cosenza , Italy.

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This study provides the first ultrastructural evidence of exosomes in human atherosclerotic plaques. These cell-derived vesicles may represent a novel intercellular communication pathway within the plaque environment.

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Area of Science:

  • Cardiovascular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Cell-to-cell communication is vital for multicellular organisms.
  • Exosomes, specialized vesicles, mediate intercellular signaling and their role in the cardiovascular system is emerging.
  • Atherosclerosis involves complex cellular interactions within the plaque.

Purpose of the Study:

  • To provide the first ultrastructural evidence of exosomes in human atherosclerotic plaque.
  • To investigate the cellular origin and characteristics of exosomes within the plaque milieu.

Main Methods:

  • Transmission electron microscopy was used to visualize exosomes.
  • Vascular cells within atherosclerotic plaques were examined for exosome production.

Main Results:

  • Exosomes were identified originating from lesional smooth muscle cells and endothelial cells within multivesicular bodies.
  • No signs of apoptosis or calcification were associated with exosome-secreting vascular cells or the extracellular exosomes.
  • These findings suggest vascular cells actively release exosomes in atherosclerotic plaques.

Conclusions:

  • This study presents the first ultrastructural evidence for exosomes in human atherosclerotic plaques.
  • Lesional smooth muscle cells and endothelial cells generate exosomes.
  • Exosomes may represent a novel mechanism for intercellular communication in the atherosclerotic plaque environment.