Autoimmunity to neuronal nicotinic acetylcholine receptors

Area of Science:

• Neuroimmunology
• Autoimmune Neurological Disorders
• Molecular Neuroscience

Background:

• Nicotinic acetylcholine receptors (nAChRs) are crucial in diverse cellular functions.
• Autoimmunity against neuronal nAChRs is less common than against muscle nAChRs.
• Antibodies targeting neuronal nAChRs are implicated in specific autoimmune neurological diseases.

Purpose of the Study:

• To review autoimmunity against neuronal nAChRs.
• To discuss autoantibodies and their pathogenic mechanisms.
• To highlight diagnostic advancements for nAChR-related autoimmune disorders.

Main Methods:

• Review of human diseases and experimental models.
• Focus on autoantibodies against specific neuronal nAChR subtypes (e.g., α3-nAChR).
• Evaluation of diagnostic assays, including cell-based assays (CBAs).

Main Results:

• Autoantibodies against α3-nAChR are pathogenic in Autoimmune Autonomic Ganglionopathy (AAG).
• Highly specific CBAs are now available for AAG diagnosis.
• Rare reports link antibodies to α7 and/or α4β2 nAChRs with other neurological conditions.

Conclusions:

• Autoimmunity to neuronal nAChRs, especially α3-nAChR, is significant in AAG.
• Emerging assays suggest neuronal nAChR autoantibodies may be more prevalent than previously thought.
• Further research with sensitive assays could uncover nAChR autoantibodies in seronegative autoimmune diseases.