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Siah3 acts as a physiological mitophagy suppressor that facilitates axonal degeneration

Omer Abraham1, Shifra Ben-Dor2, Inna Goliand3

  • 1Department of Biomolecular Sciences and Department of Molecular Neuroscience, Weizmann Institute of Science, Rehovot 761000, Israel.

Science Signaling
|October 8, 2024
PubMed

Insights

The protein Siah3 suppresses mitophagy, promoting axonal remodeling. Siah3 deficiency delays axonal degeneration, revealing mitophagy

Area of Science:

  • Cellular Biology
  • Neuroscience
  • Molecular Biology

Background:

  • Mitophagy is crucial for clearing damaged mitochondria and is linked to age-related diseases.
  • Dysfunctional mitophagy contributes to neurodegenerative conditions.

Purpose of the Study:

  • To investigate the role of mitophagy suppression by Siah3 in axonal remodeling.
  • To elucidate the molecular mechanisms by which Siah3 influences axonal degeneration and mitophagy.

Main Methods:

  • Studied Siah3-deficient mice and cultured sensory neurons.
  • Analyzed axonal degeneration, caspase-3 activation, and mitophagy.
  • Investigated the interaction between Siah3 and parkin (a mitophagy component).

Main Results:

  • Siah3 suppression promoted developmental axonal remodeling and increased peripheral innervation.
  • Siah3-deficient neurons showed delayed axonal degeneration and mitophagy upon trophic support withdrawal.
  • Siah3 interacts with parkin and regulates mitophagy induction during axonal degeneration.

Conclusions:

  • Mitophagy regulation by Siah3 acts as a gatekeeper for physiological axon elimination.
  • Targeting Siah3-mediated mitophagy may offer therapeutic strategies for neurological disorders.

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