NK cells in central nervous system disorders.

Area of Science:

• Immunology
• Neuroscience

Background:

• Natural killer (NK) cells are key components of the innate immune system, acting as early responders to inflammation.
• They possess cytokine production capabilities, influencing adaptive immunity, and regulatory functions to prevent autoimmunity by eliminating self-reactive immune cells.

Purpose of the Study:

• To review the diverse roles and characteristics of peripheral and central nervous system (CNS) NK cells.
• To examine NK cell involvement in various CNS pathologies, including tumors, infections, neurodegenerative diseases, and injuries.
• To explore NK cell-mediated neurotoxicity and neuroprotection, and their interactions with resident brain immune cells.

Main Methods:

• Literature review of scientific articles on NK cells and CNS disorders.
• Analysis of NK cell phenotypes and functions in different neuropathological contexts.
• Examination of the interplay between NK cells and other neuro-immune cells.

Main Results:

• NK cells exhibit distinct phenotypes and functions in peripheral versus CNS environments.
• Their involvement in CNS disorders is multifaceted, contributing to both pathology and protection.
• Evidence suggests significant crosstalk between NK cells and brain-resident immune cells, such as microglia and astrocytes.

Conclusions:

• NK cells play paradoxical roles in the CNS, impacting neuroinflammation, neurodegeneration, and recovery.
• Understanding NK cell dynamics is critical for developing targeted therapies for CNS diseases.
• Further research into NK cell-brain immune cell interactions is warranted to elucidate their full therapeutic potential.