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Updated: Feb 8, 2026

Listeria monocytogenes Infection of the Brain
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Infection control in the brain and the eye.

John V Forrester1, Paul G McMenamin2,3, Samantha J Dando4

  • 1School of Medicine, Medical Sciences and Nutrition, Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK.

Acta Ophthalmologica
|February 7, 2026
PubMed
Summary
This summary is machine-generated.

Regulatory T cells (Tregs) are key to the Central Nervous System's (CNS) immune privilege, protecting the brain and eyes from infection. These specialized cells promote infectious agent latency, maintaining CNS health.

Keywords:
CNSimmune privilegeinfectionlatency

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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.