Growth-Promoting Treatment Screening for Corticospinal Neurons in Mouse and Man

Cell Mol Neurobiol. 2020 Nov;40(8):1327-1338. doi: 10.1007/s10571-020-00820-7. Epub 2020 Mar 14.

Abstract

Neurons of the central nervous system (CNS) that project long axons into the spinal cord have a poor axon regenerative capacity compared to neurons of the peripheral nervous system. The corticospinal tract (CST) is particularly notorious for its poor regeneration. Because of this, traumatic spinal cord injury (SCI) is a devastating condition that remains as yet uncured. Based on our recent observations that direct neuronal interleukin-4 (IL-4) signaling leads to repair of axonal swellings and beneficial effects in neuroinflammation, we hypothesized that IL-4 acts directly on the CST. Here, we developed a tissue culture model for CST regeneration and found that IL-4 promoted new growth cone formation after axon transection. Most importantly, IL-4 directly increased the regenerative capacity of both murine and human CST axons, which corroborates its regenerative effects in CNS damage. Overall, these findings serve as proof-of-concept that our CST regeneration model is suitable for fast screening of new treatments for SCI.

Keywords: Corticospinal tract; Growth-promoting treatment; Interleukin-4; Regeneration; Spinal cord injury.

MeSH terms

  • Animals
  • Axons / metabolism*
  • Humans
  • Mice, Inbred C57BL
  • Nerve Regeneration / drug effects
  • Nerve Regeneration / physiology*
  • Neurons / metabolism*
  • PTEN Phosphohydrolase / metabolism
  • PTEN Phosphohydrolase / pharmacology
  • Pyramidal Tracts / drug effects
  • Pyramidal Tracts / physiology
  • Recovery of Function / drug effects
  • Recovery of Function / physiology*
  • Spinal Cord Injuries / metabolism
  • Spinal Cord Injuries / therapy*

Substances

  • PTEN Phosphohydrolase