Infection control in the brain and the eye

Area of Science:

• Neuroimmunology
• Immunology
• Ophthalmology

Background:

• The Central Nervous System (CNS) exhibits immune privilege (IP), a unique defense against immunological challenges.
• While IP is studied using antigens and grafts, its role in host-pathogen interactions within the CNS is less understood.
• Low CNS infection rates in healthy individuals suggest robust regulatory mechanisms against pathogens.

Purpose of the Study:

• To investigate the role of regulatory T cells (Tregs) in CNS immune privilege.
• To explore how Tregs modulate host-pathogen interactions in the brain and eye.
• To understand the mechanisms by which Tregs maintain CNS homeostasis against infections.

Main Methods:

• Analysis of immune cell populations in CNS border tissues (meninges, uveal tract).
• Investigating the function and location of CNS-specific Tregs.
• Examining the transcriptional profile and distant function of Tregs.

Main Results:

• CNS border tissues harbor regulatory T cells (Tregs) crucial for controlling brain parenchymal infections.
• Ocular immune privilege, especially in the neural retina, is supported by Tregs.
• Tregs are transcriptionally adapted to the CNS and function remotely from venous sinus-associated niches.

Conclusions:

• Regulatory T cells (Tregs) are proposed as primary drivers of CNS immune privilege.
• Tregs likely maintain CNS IP by promoting the latency of infectious agents.
• Understanding Treg function offers insights into CNS infection control and neuroinflammatory diseases.