Brain dendritic cells: biology and pathology

Area of Science:

• Neuroimmunology
• Cellular Immunology

Background:

• Dendritic cells (DCs) are key antigen-presenting cells, crucial for immune responses and tolerance.
• The brain was traditionally considered devoid of DCs, with microglia performing immune surveillance.
• Emerging evidence suggests DCs are present and functional in the brain under various conditions.

Purpose of the Study:

• To review the literature on dendritic cell presence and function in the young and aged steady-state brain.
• To examine the role of DCs in neuroinflammation associated with autoimmune diseases, injury, and infections.
• To discuss DC trafficking, novel technologies for studying brain DCs, and therapeutic potentials.

Main Methods:

• Literature review of recent studies on dendritic cells in the central nervous system.
• Analysis of research on DC involvement in neuroinflammation and neurodegenerative diseases.
• Exploration of studies on DC trafficking and technological advancements.

Main Results:

• Recent evidence challenges the long-held view of DC absence in the brain.
• DCs play significant roles in brain immune surveillance and in response to neuroinflammation.
• DC contributions are evident in various pathological conditions, including autoimmune diseases and CNS infections.

Conclusions:

• Dendritic cells are integral components of the brain's immune landscape, extending beyond peripheral functions.
• Understanding brain DC biology is crucial for developing novel therapeutic strategies for neurological disorders.
• Further research utilizing advanced technologies will elucidate DC ontogeny and function within the CNS.