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Mitochondria-targeted antioxidants prevent TNFα-induced endothelial cell damage

I I Galkin1, O Yu Pletjushkina, R A Zinovkin

  • 1Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119991, Russia. galkin.ivan.i@gmail.com.

Biochemistry. Biokhimiia
|May 6, 2014
PubMed

Insights

Mitochondria-targeted antioxidant SkQR1 prevents tumor necrosis factor α (TNFα)-induced endothelial cell death by inhibiting mitochondrial reactive oxygen species (ROS). This suggests potential vasoprotective applications for antioxidants in vascular pathologies.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Elevated tumor necrosis factor α (TNFα) serum levels contribute to endothelial dysfunction and vascular diseases.
  • TNFα signaling pathways are implicated in the generation of reactive oxygen species (ROS).

Purpose of the Study:

  • To investigate the role of mitochondrial ROS in TNFα-induced apoptosis of human endothelial cells.
  • To evaluate the efficacy of the mitochondria-targeted antioxidant SkQR1 as a potential vasoprotective agent.

Main Methods:

  • Utilized human endothelial cell line EAhy926 for experiments.
  • Administered varying concentrations of SkQR1 and its analogs.
  • Assessed apoptosis markers, including caspase activation, cytochrome c release, and PARP cleavage.
  • Analyzed the expression of apoptosis-related proteins such as Bcl-2, Bax, and p53.

Main Results:

  • 0.2 nM SkQR1 effectively prevented TNFα-induced apoptosis in endothelial cells.
  • SkQR1 inhibited mitochondrial cytochrome c release and downstream caspase-3/PARP cleavage, without affecting early caspase-8/Bid activation.
  • SkQ analogs lacking antioxidant properties did not confer protection.
  • SkQR1 treatment upregulated anti-apoptotic Bcl-2 and downregulated pro-apoptotic Bax and p53.

Conclusions:

  • Mitochondrial ROS production is a key mediator in TNFα-induced endothelial cell death.
  • Mitochondria-targeted antioxidants, exemplified by SkQR1, demonstrate vasoprotective potential.
  • Targeting mitochondrial ROS offers a promising therapeutic strategy for vascular pathologies associated with TNFα signaling.

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