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UCP4 is a target effector of the NF-κB c-Rel prosurvival pathway against oxidative stress

Jessica Wing-Man Ho1, Philip Wing-Lok Ho, Hui-Fang Liu

  • 1Division of Neurology, University Department of Medicine, University of Hong Kong, Hong Kong, People's Republic of China.

Free Radical Biology & Medicine
|May 15, 2012
PubMed

Insights

Mitochondrial uncoupling protein-4 (UCP4) protects neurons by activating the NF-κB c-Rel pathway, reducing oxidative stress and preserving mitochondrial function. This pathway targets UCP4 to mitigate neuronal damage.

Area of Science:

  • Neuroscience
  • Mitochondrial Biology
  • Cellular Signaling

Background:

  • Mitochondrial uncoupling protein-4 (UCP4) is crucial for neuronal survival against oxidative stress.
  • Nuclear factor-kappa B (NF-κB) signaling, involving p65 (cell death) and c-Rel (cell survival), regulates neuronal viability.
  • Previous work established NF-κB's role in UCP4-mediated neuroprotection against MPP(+) toxicity.

Purpose of the Study:

  • To investigate the specific role of the NF-κB c-Rel prosurvival pathway in UCP4-mediated neuroprotection.
  • To elucidate the molecular mechanisms by which c-Rel influences UCP4 expression and function under oxidative stress.
  • To determine if UCP4 acts as a downstream effector of the c-Rel prosurvival pathway.

Main Methods:

  • Overexpression of c-Rel in SH-SY5Y neuroblastoma cells.
  • Assessing NF-κB activity and UCP4 promoter activity using luciferase assays.
  • Electrophoretic mobility shift assays (EMSA) to analyze NF-κB binding to the UCP4 promoter.
  • UCP4 knockdown experiments to evaluate its necessity for c-Rel's protective effects.
  • Measurement of oxidative stress markers (superoxide, GSH/GSSG ratio) and mitochondrial membrane potential (MMP).

Main Results:

  • c-Rel overexpression enhanced NF-κB activity and significantly increased UCP4 promoter activity and protein expression.
  • EMSA confirmed NF-κB binding to the UCP4 promoter, with p50/p50 and p50/c-Rel dimers involved.
  • Under H(2)O(2)-induced oxidative stress, UCP4 knockdown exacerbated oxidative damage and MMP loss.
  • c-Rel overexpression mitigated oxidative stress and preserved MMP, effects abolished by UCP4 knockdown.
  • These findings indicate UCP4 is a key effector of c-Rel-mediated neuroprotection.

Conclusions:

  • The NF-κB c-Rel prosurvival pathway directly upregulates UCP4 expression.
  • UCP4 acts as a critical downstream effector of c-Rel, mediating neuroprotection against oxidative stress.
  • Targeting the c-Rel/UCP4 axis represents a potential therapeutic strategy for neurodegenerative diseases involving mitochondrial dysfunction and oxidative stress.

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