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DLK initiates a transcriptional program that couples apoptotic and regenerative responses to axonal injury

Trent A Watkins1, Bei Wang, Sarah Huntwork-Rodriguez

  • 1Neurodegeneration Laboratories, Department of Neuroscience, Gentech, Inc., South San Francisco, CA 94080, USA.

Proceedings of the National Academy of Sciences of the United States of America
|February 23, 2013
PubMed

Insights

Dual leucine zipper kinase (DLK) mediates both neuron death and regeneration after injury. Inhibiting DLK protects retinal ganglion cells (RGCs) but hinders axon regrowth, revealing a coupled damage response mechanism.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Cellular intrinsic factors governing neuronal fate after axonal injury remain unclear.
  • Understanding these factors is crucial for developing treatments for neuronal damage.

Purpose of the Study:

  • To investigate the role of mixed-lineage domain protein kinase (DLK) in mediating neuronal survival and regeneration following axonal injury.
  • To elucidate the molecular mechanisms linking pro-apoptotic and pro-regenerative gene expression in response to injury.

Main Methods:

  • Optic nerve crush injury model in mice.
  • Analysis of DLK protein levels in retinal ganglion cells (RGCs) post-injury.
  • Genetic deletion of DLK in the retina.
  • Assessment of RGC survival and axon regeneration.
  • Evaluation of gene expression changes, including PTEN (phosphatase and tensin homolog).

Main Results:

  • DLK protein levels rapidly increase in RGCs after optic nerve injury.
  • DLK is essential for most injury-induced gene expression changes, including both pro-apoptotic and regeneration-associated genes.
  • DLK deletion in the retina significantly protects RGCs from degeneration post-injury.
  • However, DLK deletion substantially reduces axon regrowth, even when PTEN is also deleted.

Conclusions:

  • DLK acts as a critical upstream mediator of both neuronal death and regeneration after axonal injury.
  • These seemingly opposing outcomes are mechanistically linked through a DLK-dependent damage detection pathway.
  • DLK inhibition offers neuroprotection but impedes functional recovery via axon regeneration.

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