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Lipopolysaccharide delays demyelination and promotes oligodendrocyte precursor proliferation in the central nervous

Thomas Skripuletz1, Elvira Miller, Lisa Grote

  • 1Department of Neurology, Hannover Medical School, Hannover, Germany.

Brain, Behavior, and Immunity
|June 4, 2011
PubMed

Insights

Systemic lipopolysaccharide (LPS) administration delayed central nervous system demyelination and enhanced remyelination by modulating microglia. This suggests certain infections may promote tissue repair in neurological diseases.

Area of Science:

  • Neuroimmunology
  • Central Nervous System (CNS) Autoimmune Disorders
  • Demyelinating Diseases

Background:

  • Systemic infections can impact CNS diseases like multiple sclerosis (MS), but the mechanisms are unclear.
  • Microglial activation, crucial in MS, has both protective and detrimental roles.
  • Understanding how peripheral inflammation affects CNS pathology is vital.

Purpose of the Study:

  • To investigate the impact of systemic lipopolysaccharide (LPS)-induced inflammation on microglial responses.
  • To analyze the effects of LPS on cuprizone-induced demyelination and remyelination in the CNS.
  • To determine the role of microglia in mediating LPS effects on CNS repair.

Main Methods:

  • Peripheral administration of lipopolysaccharide (LPS) to induce systemic inflammation.
  • Utilizing the cuprizone model for induced de- and remyelination in the CNS.
  • Assessing microglial proliferation, activation, and phenotype (Toll-like receptor 4).
  • Quantifying oligodendrocyte precursor cells (OPC) and mature oligodendrocytes during remyelination.
  • Measuring ciliary neurotrophic factor expression.

Main Results:

  • LPS administration delayed demyelination by inhibiting microglial proliferation and activation.
  • LPS altered microglial phenotype, increasing Toll-like receptor 4 expression.
  • While delaying initial myelin protein re-expression, LPS ultimately promoted remyelination.
  • LPS increased proliferating oligodendrocyte precursor cells (OPC) and mature oligodendrocytes.
  • Increased ciliary neurotrophic factor expression correlated with enhanced OPC proliferation.

Conclusions:

  • Systemic LPS administration beneficially modulates microglial activity, delaying demyelination and enhancing remyelination.
  • The observed effects are linked to increased proliferation of oligodendrocyte precursor cells (OPCs).
  • These findings suggest that exposure to specific infectious agents within a critical time window may promote CNS tissue repair.

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