Th17 cells regulate the progress of anti-NMDAR encephalitis

Area of Science:

• Neuroimmunology
• Cellular Immunology
• Molecular Biology

Background:

• Anti-N-methyl-D-aspartate receptor (NMDAR) encephalitis is a severe autoimmune neurological disorder.
• The role of T helper 17 (Th17) cells in the pathogenesis of anti-NMDAR encephalitis requires further elucidation.

Purpose of the Study:

• To investigate the mechanism of immune regulation by Th17 cells in anti-NMDAR encephalitis.
• To analyze the correlation between Th17 cell activity and disease prognosis.

Main Methods:

• Retrospective analysis of 83 subjects (35 anti-NMDAR encephalitis patients, 48 controls).
• Analysis of cerebrospinal fluid (CSF) and blood samples for Th17 cell counts, immunophenotypes, and differentiation pathways.
• In vitro study of peripheral blood mononuclear cells (PBMCs) stimulated with various cytokines to assess Th17 cell differentiation and RORγt mRNA expression.

Main Results:

• Significantly elevated Th17 cells and CD62L/CCR7 expression in the CSF of encephalitis patients.
• Increased mRNA levels of pro-inflammatory cytokines (IL-1β, IL-6, IL-7, IL-23) in PBMCs and serum of the encephalitis group.
• Highest Th17 cell differentiation and RORγt mRNA expression observed with combined IL-1β, IL-6, and IL-23 stimulation.
• Higher Th17 cell levels in CSF correlated with poor prognosis in anti-NMDAR encephalitis patients.

Conclusions:

• Th17 cell proportion and associated cytokine expression are elevated in anti-NMDAR encephalitis.
• Th17 cells are implicated in the pathogenesis, treatment response, and prognosis of anti-NMDAR encephalitis.
• Targeting Th17 cell pathways may offer therapeutic potential for anti-NMDAR encephalitis.