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Related Experiment Videos

The membrane attack complex of complement mediates peripheral nervous system demyelination in vitro

W Brück1, Y Brück, U Diederich

  • 1Department of Neuropathology, University of Göttingen, Germany.

Acta Neuropathologica
|January 1, 1995
PubMed
Summary

Activated complement components, specifically the membrane attack complex (MAC), trigger myelin sheath breakdown and demyelination in nerve cells. This study demonstrates MAC

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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Demyelination is a pathological process affecting the nervous system.
  • The role of the complement system in demyelination is not fully understood.

Purpose of the Study:

  • To investigate the role of activated complement components in demyelination using in vitro cocultures.
  • To elucidate the mechanism by which complement activation leads to myelin damage.

Main Methods:

  • Cocultures of rat dorsal root ganglia (DRG) and peritoneal macrophages were utilized.
  • Complement cascade activation was induced using natural rat serum and lipopolysaccharides.
  • Immunoelectron microscopy detected the membrane attack complex of complement (MAC) (C5-9).

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Main Results:

  • Complement activation and MAC deposition correlated with myelin sheath morphological changes, including disruption and decompaction.
  • Macrophages selectively attacked myelin sheaths, leading to demyelination.
  • Schwann cells, axons, and sensory ganglion cells remained viable despite complement activation.

Conclusions:

  • Activated complement, particularly MAC, initiates myelin damage.
  • Complement-mediated myelin damage precedes macrophage-mediated demyelination.
  • The complement system plays a critical role in initiating demyelination without compromising neuronal or glial cell survival.