Innate antiviral signalling in the central nervous system

Area of Science:

• Neuroimmunology
• Virology
• Infectious Diseases

Background:

• The innate immune system is crucial for defending the central nervous system (CNS) against neurotropic viruses.
• Pattern recognition receptors (PRRs), including Toll-like receptors (TLRs), RIG-I-like receptors (RLRs), NOD-like receptors (NLRs), and cytosolic DNA sensors, are key components of this defense.
• While PRRs were initially studied in peripheral immune cells, their significant roles within the CNS are increasingly recognized.

Purpose of the Study:

• To review recent advancements in understanding how PRRs protect the CNS against neurotropic viral infections.
• To discuss the dual role of PRR activation, highlighting instances where these immune responses lead to detrimental immunopathology in the CNS.

Main Methods:

• Literature review of recent studies on innate immunity and neurotropic viruses.
• Analysis of the mechanisms of PRR activation and function in CNS cells.
• Examination of the pathological consequences of PRR signaling during viral infections of the CNS.

Main Results:

• PRRs are activated by various neurotropic viruses (e.g., HSV, WNV, rabies virus) infecting the CNS.
• These receptors initiate protective immune responses within the CNS.
• Dysregulated or excessive PRR activation can result in detrimental inflammation and immunopathology within the CNS.

Conclusions:

• PRRs play a vital, yet complex, role in the CNS's response to viral infections.
• Understanding PRR mechanisms is essential for developing therapeutic strategies against neurotropic viral diseases.
• Further research is needed to balance protective immunity and prevent immunopathology in the CNS.