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CNS macrophage contributions to myelin health

Alana Hoffmann1,2,3,4, Veronique E Miron1,2,3,4

  • 1BARLO Multiple Sclerosis Centre and Keenan Research Centre for Biomedical Science at St. Michael's Hospital, Toronto, Ontario, Canada.

Immunological Reviews
|November 1, 2024
PubMed

Insights

Central nervous system (CNS) macrophages, including microglia and infiltrating monocytes, play key roles in myelin development and repair. Understanding these distinct macrophage populations is crucial for developing therapies to support myelin health.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Myelin, produced by oligodendrocytes, is vital for CNS function, providing insulation and support to axons.
  • Dysfunction in myelin development, damage, or regeneration contributes to CNS disorders and aging-related decline.
  • Limited therapeutic options exist for myelin health, emphasizing the need to understand oligodendrocyte regulation.

Purpose of the Study:

  • To summarize current knowledge on the roles of CNS macrophages in myelin health.
  • To highlight recent advancements in distinguishing the functions of various CNS macrophage populations.
  • To underscore the importance of understanding macrophage-oligodendrocyte interactions for myelin repair.

Main Methods:

  • Review of existing literature on CNS macrophages and myelin.
  • Discussion of emerging tools for identifying, tracking, and targeting macrophage subsets.
  • Synthesis of findings on macrophage influence during myelin development, homeostasis, and disease.

Main Results:

  • CNS macrophages, encompassing microglia and blood-derived monocytes, critically influence myelin development, maintenance, damage, and regeneration.
  • Distinct macrophage populations (microglia, border-associated, and infiltrating) exert unique effects on oligodendrocyte lineage cells.
  • New tools are enabling a deeper understanding of these specific macrophage contributions.

Conclusions:

  • CNS macrophages are key regulators of myelin health throughout life.
  • Differentiating the roles of specific macrophage populations is essential for therapeutic development.
  • Further research into macrophage-oligodendrocyte interactions holds promise for treating myelin-related disorders.
Keywords:
central nervous systemmacrophagemicrogliamyelinoligodendrocytewhite matter

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