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Related Experiment Video

Updated: Jun 12, 2026

Generation of Lymphocytic Microparticles and Detection of their Proapoptotic Effect on Airway Epithelial Cells
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Published on: February 20, 2015

Endothelial dysfunction and circulating microparticles from patients with obstructive sleep apnea.

Pascaline Priou1, Frédéric Gagnadoux, Angela Tesse

  • 1INSERM U771, Centre National de la Recherche Scientifique UMR 6214, Université d'Angers, Angers, France.

The American Journal of Pathology
|June 23, 2010
PubMed
Summary

Obstructive sleep apnea (OSA) with nocturnal hypoxia increases circulating activated leukocyte microparticles (MPs). These MPs impair endothelial function, potentially initiating atherosclerosis in OSA patients.

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Area of Science:

  • Cardiovascular Science
  • Sleep Medicine
  • Cell Biology

Background:

  • Endothelial dysfunction is a key factor in obstructive sleep apnea (OSA) vascular complications.
  • Nocturnal hypoxia in OSA patients is linked to impaired vascular health.

Purpose of the Study:

  • To characterize circulating microparticles (MPs) in OSA patients with nocturnal desaturations.
  • To evaluate the impact of these MPs on endothelial function in vitro and in vivo.

Main Methods:

  • Comparison of MPs from OSA desaturators (ODI >= 10) and non-desaturators (ODI < 10) using flow cytometry.
  • In vitro treatment of human endothelial cells with MPs.
  • In vivo studies of endothelial function in mice injected with MPs from desaturators.

Main Results:

  • Higher levels of granulocyte and activated leukocyte (CD62L(+)) MPs found in desaturators.
  • MPs from desaturators reduced endothelial nitric oxide (NO) production and increased expression of adhesion molecules.
  • MPs from desaturators impaired endothelium-dependent relaxation in mouse aorta and mesenteric arteries.

Conclusions:

  • Increased circulating CD62L(+) MPs are associated with endothelial dysfunction in OSA patients.
  • These MPs may contribute to atherogenic processes in OSA patients experiencing severe nighttime hypoxia.