Meningeal B cells: Emerging players at the brain border

Area of Science:

• Neuroimmunology
• Central Nervous System (CNS) Immunology
• Meningeal Immunity

Background:

• The meninges, once considered passive barriers, are now known as active immune sites.
• B cells are increasingly recognized for their significant roles in CNS homeostasis and pathology.
• Distinct meningeal B cell subsets, including precursors and IgA+ plasma cells, have been identified.

Purpose of the Study:

• To review current knowledge on meningeal B cells.
• To highlight future research directions for understanding meningeal B cell dynamics.
• To explore the dual protective and pathogenic functions of meningeal B cells.

Main Methods:

• Literature review of recent studies on meningeal immunity and B cells.
• Analysis of B cell subsets, origins, and functions within the meninges.
• Synthesis of current understanding and identification of research gaps.

Main Results:

• Meningeal B cells are diverse, with origins linked to skull marrow and gut microbiota.
• These cells play roles in immune tolerance, barrier function, and neural development/repair.
• Meningeal B cells can also contribute to CNS autoimmunity, aging, and neurodegeneration.

Conclusions:

• Meningeal B cells are critical players in CNS health and disease.
• Further research is needed to elucidate their complex functions and therapeutic potential.
• Understanding the balance of protective versus pathogenic roles is key for future interventions.