Safiedeen 2016 Antioxid Redox Signal

From Bioblast
Publications in the MiPMap
Safiedeen Z, RodrΓ­guez-GΓ³mez I, Vergori L, Soleti R, Vaithilingam D, Douma I, Agouni A, Leiber D, Dubois S, Simard G, Zibara K, Andriantsitohaina R, MartΓ­nez MC (2016) Temporal cross talk between endoplasmic reticulum and mitochondria regulates oxidative stress and mediates microparticle-induced endothelial dysfunction. Antioxid Redox Signal 26:15-27.

Β» PMID: 27392575

Safiedeen Z, Rodriguez-Gomez I, Vergori L, Soleti R, Vaithilingam D, Douma I, Agouni A, Leiber D, Dubois S, Simard G, Zibara K, Andriantsitohaina R, Martinez MC (2016) Antioxid Redox Signal

Abstract: Circulating microparticles (MPs) from metabolic syndrome patients and those generated from apoptotic T-cells induce endothelial dysfunction; however, the molecular and cellular mechanism(s) underlying in the effects of MPs remain to be elucidated.

Here, we show that both types of MPs increased expression of endoplasmic reticulum (ER) stress markers XBP-1, p-eIF2alpha and CHOP and nuclear translocation of ATF6 on human aortic endothelial cells. MPs decreased in vitro nitric oxide release by human aortic endothelial cells, whereas in vivo MP injection into mice impaired the endothelium-dependent relaxation induced by acetylcholine. These effects were prevented when ER stress was inhibited suggesting that ER stress is implicated in the endothelial effects induced by MPs. MPs affected mitochondrial function and evoked sequential increase of cytosolic and mitochondrial reactive oxygen species (ROS). Pharmacological inhibition of ER stress and silencing of neutral sphingomyelinase with siRNA abrogated all MP-mediated effects. Neutralization of Fas-Ligand carried by MPs abolished effects induced by both MP types, whereas neutralization of low density lipoprotein-receptor on endothelial cells prevented T-lymphocyte MP-mediated effects.

Collectively, endothelial dysfunction triggered by MPs involves temporal cross-talk between ER and mitochondria with respect to spatial regulation of ROS via the neutral sphingomyelinase and interaction of MPs with Fas and/or low density lipoprotein-receptor. These results provide a novel molecular insight into the manner MPs mediate vascular dysfunction and allow identification of potential therapeutic targets to treat vascular complications associated with metabolic syndrome.

β€’ Bioblast editor: Kandolf G β€’ O2k-Network Lab: FR Angers Gueguen N, FR Angers Andriantsitohaina R

Labels: MiParea: Respiration  Pathology: Diabetes, Obesity, Other  Stress:Oxidative stress;RONS  Organism: Human  Tissue;cell: Endothelial;epithelial;mesothelial cell  Preparation: Intact cells  Enzyme: Complex IV;cytochrome c oxidase 

Coupling state: LEAK, ROUTINE, ET  Pathway: ROX  HRR: Oxygraph-2k 

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