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A Small Molecule That Protects the Integrity of the Electron Transfer Chain Blocks the Mitochondrial Apoptotic

Xian Jiang1, Li Li2, Zhengxin Ying1

  • 1National Institute of Biological Sciences, 7 Science Park Road, Zhongguancun Life Science Park, Beijing 102206, China.

Molecular Cell
|July 23, 2016
PubMed

Insights

Researchers discovered a small molecule that prevents programmed cell death (apoptosis) by targeting the succinate dehydrogenase subunit B (SDHB) protein. This molecule protects mitochondrial function and shows promise in treating Parkinson's disease models.

Area of Science:

  • Cell Biology
  • Neuroscience
  • Biochemistry

Background:

  • Mitochondria release cytochrome c, activating caspases and causing apoptosis.
  • Pro-apoptotic Bcl-2 proteins like Bim and Bax promote this release.
  • Targeting this pathway offers therapeutic potential.

Purpose of the Study:

  • To discover a small molecule inhibiting Bim-induced apoptosis.
  • To identify the molecular target of this novel inhibitor.
  • To evaluate its therapeutic efficacy in a Parkinson's disease model.

Main Methods:

  • High-throughput screening for apoptosis inhibitors.
  • Biochemical assays to identify protein targets.
  • Cellular assays to assess mitochondrial integrity and proliferation.
  • In vivo studies using a rat model of Parkinson's disease.

Main Results:

  • A small molecule was identified that blocks Bim-induced apoptosis post-Bax activation.
  • The molecule's target is succinate dehydrogenase subunit B (SDHB) in mitochondrial complex II.
  • The molecule preserves the electron transfer chain (ETC) integrity, enabling cell proliferation.
  • It reduced dopaminergic neuron death and reversed Parkinson's-like behaviors in rats.

Conclusions:

  • SDHB is a viable target for inhibiting apoptosis.
  • This small molecule represents a potential therapeutic strategy for neurodegenerative diseases like Parkinson's.
  • Maintaining mitochondrial ETC function is key to preventing apoptosis and neuronal loss.

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