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Researchers discovered a second barrier at the glia limitans (GL) in inflammatory central nervous system (CNS) diseases like multiple sclerosis (MS). This barrier, formed by reactive astrocytes, controls immune cell entry and may be a therapeutic target.

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Area of Science:

  • Neuroimmunology
  • Cellular Biology
  • Pathology

Background:

  • Inflammatory central nervous system (CNS) diseases, including multiple sclerosis (MS), are characterized by leukocyte and humoral factor translocation across the blood-brain barrier (BBB) and glia limitans (GL).
  • Reactive astrocytes disrupt the BBB by affecting endothelial tight junctions (TJs), but mechanisms controlling GL penetration remain unclear.

Purpose of the Study:

  • To investigate the mechanisms governing immune cell and factor entry across the astrocytic glia limitans (GL) in inflammatory CNS diseases.
  • To identify potential therapeutic targets for controlling CNS inflammation and neurodegeneration.

Main Methods:

  • Utilized a human coculture model to assess astrocyte function in lymphocyte segregation.
  • Generated astrocyte-specific Cldn4-deficient mice to model CNS inflammation and multiple sclerosis (MS).
  • Analyzed leukocyte and humoral infiltration, neuropathology, motor disability, and mortality in experimental models.

Main Results:

  • Identified an inducible barrier at the GL in inflammatory lesions, comprising reactive astrocyte tight junctions (TJs) with Claudin 1 (CLDN1), Claudin 4 (CLDN4), and Junctional Adhesion Molecule A (JAM-A) subunits.
  • CLDN4-deficient astrocytes demonstrated impaired lymphocyte segregation in a human coculture model.
  • Astrocyte-specific Cldn4 deletion in mice exacerbated CNS inflammation, leading to increased leukocyte/humoral infiltration, neuropathology, motor deficits, and mortality.

Conclusions:

  • A second, inducible barrier exists at the glia limitans (GL) in inflammatory CNS diseases, regulated by astrocyte tight junctions (TJs).
  • Claudin 4 (CLDN4) is a critical component of this GL barrier, controlling immune cell infiltration.
  • This GL barrier represents a potential therapeutic target for managing inflammatory CNS diseases like multiple sclerosis (MS).