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CIB1 protects against MPTP-induced neurotoxicity through inhibiting ASK1

Kyoung Wan Yoon1,2, Hyun-Suk Yang2, Young Mok Kim1

  • 1Department of Life Sciences, Korea University, Seoul, 02841, Korea.

Scientific Reports
|September 24, 2017
PubMed

Insights

Calcium and integrin binding protein 1 (CIB1) protects brain cells. Loss of CIB1 worsens Parkinson

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biochemistry

Background:

  • Calcium and integrin binding protein 1 (CIB1) is a calcium-binding protein.
  • CIB1 interacts with multiple proteins, but its brain function is unknown.
  • Parkinson's disease involves dopaminergic neuron degeneration.

Purpose of the Study:

  • To investigate the biological function of CIB1 in the brain.
  • To determine CIB1's role in Parkinson's disease pathogenesis.

Main Methods:

  • Used a mouse model of Parkinson's disease induced by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP).
  • Examined neurotoxicity in CIB1 knockout (CIB1-/-) mice.
  • Utilized RNA interference (RNAi) to deplete CIB1 in primary dopaminergic neurons.
  • Assessed neuronal death induced by 1-methyl-4-phenyl pyrinidium (MPP+).
  • Investigated the interaction between CIB1 and apoptosis signal-regulating kinase 1 (ASK1).

Main Results:

  • Genetic deficiency of CIB1 exacerbated MPTP-induced dopaminergic neurotoxicity.
  • CIB1 depletion enhanced MPP+-induced death in dopaminergic neurons.
  • CIB1 physically associated with ASK1, inhibiting its activation.
  • CIB1 blocked the ASK1-mediated signaling cascade.

Conclusions:

  • CIB1 negatively regulates dopaminergic neuron degeneration.
  • CIB1 plays a protective role against MPTP/MPP+-induced neurotoxicity.
  • CIB1 exerts its neuroprotective effects by inhibiting ASK1 signaling.

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