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Dissecting the multifactorial nature of demyelinating disease

Karolina Kucharova1, William B Stallcup1

  • 1Sanford Burnham Prebys Medical Discovery Institute, Cancer Center; Tumor Microenvironment and Cancer Immunology Program, La Jolla, CA, USA.

Neural Regeneration Research
|May 4, 2018
PubMed

Insights

Chondroitin sulfate proteoglycan-4 (CSPG4) influences myelin repair by affecting oligodendrocyte progenitor cells (OPCs) and myeloid cell recruitment. CSPG4 ablation in OPCs impairs myelin repair, while in myeloid cells, it reduces macrophage infiltration and myelin repair.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Regenerative Medicine

Background:

  • Chondroitin sulfate proteoglycan-4 (CSPG4) is expressed on oligodendrocyte progenitor cells (OPCs) and myeloid cells in spinal cord lesions.
  • CSPG4 plays a role in myelin damage and repair processes within the central nervous system.

Purpose of the Study:

  • To investigate the function of CSPG4 in OPCs and myeloid cells during myelin repair after spinal cord injury.
  • To elucidate the mechanisms by which CSPG4 influences cell behavior and lesion outcomes.

Main Methods:

  • Utilized cell-specific ablation of CSPG4 in OPCs and myeloid cells in a mouse model of lysolecithin-induced spinal cord lesions.
  • Employed enhanced green fluorescent protein (EGFP)-labeled progenitors to differentiate between bone marrow-derived macrophages and resident microglia.

Main Results:

  • Ablation of CSPG4 in OPCs reduced myelin repair due to impaired OPC proliferation and oligodendrocyte generation.
  • Ablation of CSPG4 in myeloid cells decreased macrophage recruitment, leading to smaller lesions but significantly diminished myelin repair.
  • Myeloid cells, but not microglia, were found to promote OPC proliferation, potentially through phagocytosis or secreted factors.

Conclusions:

  • CSPG4 is crucial for effective myelin repair, impacting both OPCs and myeloid cell functions.
  • Macrophages are essential for promoting OPC proliferation and subsequent remyelination, a role that microglia cannot fulfill.
  • Targeting CSPG4 or enhancing macrophage function presents potential therapeutic strategies for spinal cord injury and demyelinating diseases.
Keywords:
Cre-Lox technologybone marrow transplantationchondroitin sulfate proteoglycan 4macrophagesmicrogliamyelin damagemyelin repairoligodendrocyte progen-itors

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