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CaMKK-CaMK1a, a new post-traumatic signalling pathway induced in mouse somatosensory neurons

Lucie Elzière1, Chamroeun Sar1, Stéphanie Ventéo1

  • 1Institute for Neurosciences of Montpellier, I.N.S.E.R.M. U1051, Montpellier, France.

Plos One
|May 21, 2014
PubMed

Insights

Calcium calmodulin kinase CaMK1a is induced in mouse dorsal root ganglia (DRG) neurons after peripheral nerve injury. This calcium signaling pathway is crucial for nerve regeneration and may be a therapeutic target.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Regenerative Medicine

Background:

  • Peripheral nerve injury triggers complex neuronal responses influencing regeneration and functional recovery.
  • Pathological consequences like neuropathic pain can offset beneficial regenerative responses.
  • Calcium signaling is integral to neuronal responses following nerve damage.

Purpose of the Study:

  • To investigate injury-induced molecular changes in dorsal root ganglia (DRG) neurons during regeneration.
  • To identify the role of calcium calmodulin kinase CaMK1a in peripheral nerve injury and regeneration.

Main Methods:

  • Studied CaMK1a induction in mouse DRG neurons across various mechanical peripheral nerve injury models.
  • Investigated the effect of neurotrophic factors (NRTN, GDNF) on CaMK1a induction.
  • Examined the impact of inhibiting CaMK signaling on neurite growth in vitro using pharmacological agents and siRNA.

Main Results:

  • CaMK1a was significantly induced in mouse DRG neurons following mechanical nerve injury, but not inflammation.
  • Intrathecal injection of NRTN or GDNF prevented CaMK1a induction, suggesting a role for target-derived factors.
  • Inhibition of CaMK signaling reduced neurite growth velocity in injured DRG neurons.

Conclusions:

  • CaMK1a induction represents an intrinsic regenerative response of DRG neurons to peripheral nerve injury.
  • CaMK1a signaling is a potential therapeutic target for enhancing peripheral nerve regeneration.

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