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Endocrinology. 2018 Sep 1;159(9):3259-3267. doi: 10.1210/en.2018-00266.

Evidence for Adipocyte-Derived Extracellular Vesicles in the Human Circulation.

Author information

1
School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, United Kingdom.
2
Neuroscience and Mental Health Research Institute, School of Medicine, Cardiff University, Cardiff, United Kingdom.
3
Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom.

Abstract

Adipocyte-derived extracellular vesicles (EVs) may serve as novel endocrine mediators of adipose tissue and impact upon vascular health. However, it is unclear whether adipocyte-derived EVs are present in the human circulation. Therefore, the purpose of this study was to seek evidence for the presence of adipocyte-derived EVs in circulating plasma. Size-exclusion chromatography of platelet-free plasma identified fractions 5 to 10 as containing EVs by a peak in particle concentration, which corresponded with the presence of EV and adipocyte proteins. Pooling fractions 5 to 10 and subjecting to ultracentrifugation yielded a plasma EV sample, as verified by transmission electron microscopy (TEM) showing EV structures and Western blotting for EV (e.g., CD9 and Alix) and adipocyte markers. Magnetic beads and a solid-phase assay were used to deplete the EV sample of the four major families of circulating EVs: platelet-derived, leukocyte-derived, endothelial-derived, and erythrocyte-derived EVs. Postdepletion samples from both techniques contained EV structures as visualized by TEM, as well as CD9, Alix, and classic adipocyte proteins. Postdepletion samples also contained a range of other adipocyte proteins from an adipokine array. Adipocyte proteins and adipokines are expressed in optimally processed plasma EV samples, suggesting that adipocyte-derived EVs are secreted into the human circulation.

PMID:
30016424
PMCID:
PMC6109300
DOI:
10.1210/en.2018-00266
[Indexed for MEDLINE]
Free PMC Article

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