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C1q is essential for myelination in the central nervous system (CNS)

Qiang Yu1, Nan Zhang2,3, Teng Guan1

  • 1Department of Human Anatomy and Cell Science, University of Manitoba, Winnipeg, MB, Canada.

Iscience
|December 13, 2023
PubMed

Insights

Microglia-derived C1q is crucial for central nervous system (CNS) myelination. This study shows C1q protein addition promotes myelin sheath formation, essential for nerve function and treating demyelinating diseases.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Myelin sheath in the CNS enables efficient action potential conduction.
  • Microglia, the resident macrophages of the CNS, are implicated in myelin development.
  • The precise role of microglia in initial myelination remains unclear.

Purpose of the Study:

  • To elucidate the specific involvement of microglia in the initial myelination process.
  • To investigate the role of microglia-derived factors, particularly C1q, in CNS myelination.

Main Methods:

  • Neural stem cell culture with microglia-conditioned medium.
  • Assessment of myelination in the absence and presence of C1q.
  • Analysis of a C1q conditional knockout mouse model (C1qaFL/FL:Cx3cr1CreER) prior to myelination onset.

Main Results:

  • Myelin sheath formation occurred only with microglia-conditioned medium.
  • Absence of C1q led to myelination failure in vitro.
  • Addition of C1q protein induced myelination in vitro.
  • C1q deficiency in vivo resulted in reduced myelin thickness and elevated g-ratio during initial myelination.

Conclusions:

  • Microglia-derived C1q plays a pivotal role in developmental myelination of the CNS.
  • C1q is sufficient to promote myelination in vitro.
  • Findings suggest potential therapeutic strategies for demyelinating diseases.
Keywords:
Biological sciencesDevelopmental neuroscienceNatural sciencesNeuroscience

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