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Induction and Clinical Scoring of Chronic-Relapsing Experimental Autoimmune Encephalomyelitis
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Experimental autoimmune encephalomyelitis repressed by microglial paralysis

Frank L Heppner1, Melanie Greter, Denis Marino

  • 1Institute of Neuropathology, University Hospital Zurich, CH-8091 Zurich, Switzerland.

Nature Medicine
|January 25, 2005
PubMed

Insights

Targeting microglia, the immune cells of the central nervous system (CNS), can halt inflammatory CNS diseases. This study validates CD11b-HSVTK mice as a tool to explore microglial roles in CNS disorders.

Area of Science:

  • Neuroimmunology
  • Central Nervous System (CNS) Disorders
  • Cellular Biology

Background:

  • Microglial activation is observed in various CNS disorders, but its precise role in disease pathogenesis remains unclear.
  • Understanding microglial function is crucial for developing targeted therapies for inflammatory CNS conditions.

Purpose of the Study:

  • To investigate the role of microglial activation in the pathogenesis of inflammatory central nervous system (CNS) disorders.
  • To validate CD11b-HSVTK transgenic mice as a model for studying microglial function in CNS diseases.

Main Methods:

  • Generation of CD11b-HSVTK transgenic mice expressing herpes simplex thymidine kinase in macrophages and microglia.
  • Treatment with ganciclovir to selectively eliminate or inhibit microglia.
  • Analysis of microglial activation markers and inflammatory responses in brain slice cultures and in vivo models (axotomy, experimental autoimmune encephalomyelitis).
  • Bone marrow chimera experiments to assess hematopoietic toxicity and microglial-specific effects.

Main Results:

  • Ganciclovir treatment abolished microglial release of inflammatory mediators (nitrite, cytokines, chemokines) in vitro.
  • Systemic ganciclovir administration in CD11b-HSVTK mice led to hematopoietic toxicity, preventable by wild-type bone marrow transfer.
  • Ganciclovir administration in bone marrow chimeras blocked microglial activation post-axotomy and repressed experimental autoimmune encephalomyelitis development.
  • Microglial paralysis effectively inhibited the development and maintenance of inflammatory CNS lesions.

Conclusions:

  • Microglial activation plays a significant role in the development and progression of inflammatory CNS disorders.
  • Targeting the microglial compartment offers a potential therapeutic strategy for inflammatory CNS diseases.
  • CD11b-HSVTK mice serve as a valuable tool for in vivo studies on the impact of microglial activation in CNS pathology.

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