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WldS prevents axon degeneration through increased mitochondrial flux and enhanced mitochondrial Ca2+ buffering

Michelle A Avery1, Timothy M Rooney, Jignesh D Pandya

  • 1Department of Neurobiology, University of Massachusetts Medical School, and Howard Hughes Medical Institute, Worcester, MA 01605-2324, USA.

Current Biology : CB
|March 20, 2012
PubMed

Insights

Slow Wallerian degeneration (WldS) protein protects axons by targeting mitochondria. It enhances mitochondrial calcium buffering and motility, preventing degeneration after injury.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Wallerian degeneration is a process that leads to the breakdown of axons after injury.
  • The slow Wallerian degeneration (WldS) protein is known to suppress this process, but its mechanism of action is not fully understood.
  • Mitochondria play crucial roles in axonal health and survival.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying the neuroprotective function of WldS.
  • To investigate the role of mitochondria in WldS-mediated neuroprotection.
  • To determine if targeting specific enzymes to mitochondria can mimic WldS function.

Main Methods:

  • Utilized Drosophila and mouse models to study WldS function.
  • Investigated the subcellular localization of WldS, particularly in mitochondria.
  • Examined the effects of WldS on axonal calcium levels and mitochondrial motility after axotomy.
  • Assessed the impact of genetically manipulating mitochondrial motility on WldS protective effects.
  • Analyzed the calcium buffering capacity of mitochondria from WldS-expressing mice.

Main Results:

  • WldS was localized to mitochondria and targeting the NAD+ biosynthetic enzyme Nmnat to mitochondria phenocopied WldS effects.
  • WldS suppressed axotomy-induced increases in axoplasmic calcium and inhibited mitochondrial movement termination.
  • WldS enhanced basal mitochondrial motility in axons prior to injury.
  • Reduced mitochondrial motility diminished the protective effects of WldS.
  • Mitochondria from WldS mice displayed enhanced calcium buffering capacity.

Conclusions:

  • Mitochondria are a key site of action for WldS neuroprotection.
  • WldS enhances mitochondrial calcium buffering, which increases mitochondrial motility.
  • This enhanced motility and calcium buffering suppress axotomy-induced calcium spikes, thereby preventing Wallerian degeneration.

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