Autoimmunity and NMDA receptor in brain disorders: Where do we stand?

Area of Science:

• Neuroimmunology
• Molecular Neuroscience
• Psychiatry

Background:

• Autoimmune encephalitis involves autoantibodies against neurotransmitter receptors, offering insights into neurological and psychiatric conditions.
• Autoantibodies against the N-methyl-D-aspartate receptor (NMDAR-Ab) in anti-NMDAR encephalitis illuminate how NMDAR signaling deficits cause neuropsychiatric symptoms.
• NMDAR-Abs are found in various conditions and healthy individuals, exhibiting diverse molecular properties and pathogenicities.

Purpose of the Study:

• To review the current understanding of NMDAR autoantibody diversity.
• To explore how different NMDAR autoantibodies cause receptor dysfunction in neuronal networks.
• To highlight the potential of autoantibodies in understanding neuropsychiatric disorder etiology and developing therapies.

Main Methods:

• Literature review of studies on NMDAR autoantibodies.
• Analysis of molecular properties and functional effects of NMDAR-Abs.
• Discussion of proposed mechanisms for NMDAR autoantibody pathogenicity.

Main Results:

• NMDAR-Abs exhibit significant heterogeneity in molecular characteristics and impact on receptor function.
• Various NMDAR-Abs can lead to neuronal network dysfunction through distinct mechanisms.
• Current understanding of patient-derived NMDAR-Abs is developing, with multiple contributing factors.

Conclusions:

• NMDAR autoantibodies are key tools for investigating neuropsychiatric disorders.
• Further molecular and cellular research is needed to fully elucidate NMDAR-Ab mechanisms.
• Autoantibodies hold promise for novel therapeutic strategies in neuropsychiatric conditions.