[Anti-basal ganglia antibody]

Area of Science:

• Neuroscience
• Immunology
• Rheumatology

Background:

• Sydenham's chorea (SC), a rheumatic fever manifestation, is linked to anti-basal ganglia antibodies (ABGA).
• Autoimmune mechanisms involving molecular mimicry triggered by streptococcal infections are hypothesized in SC pathogenesis.
• ABGA involvement is suggested in other movement and psychiatric disorders like Tourette's syndrome (TS), obsessive-compulsive disorder (OCD), and PANDAS.

Observation:

• Recent studies detected autoantibodies against dopamine receptors in basal ganglia encephalitis patients.
• An increase in subacute encephalitis cases with altered behavior and involuntary movements has been observed in Japan.
• The efficacy of immune-modulating treatments in these encephalitis cases supports an autoimmune etiology.

Findings:

• This study aimed to detect anti-neuronal autoantibodies in encephalitis patients using immunohistochemical assessment.
• Sera from patients exhibiting involuntary movements showed immunoreactivity against basal ganglia neurons.
• The findings support the role of autoantibodies in basal ganglia disorders.

Implications:

• Further investigation into ABGA epitopes is warranted in basal ganglia disorders beyond SC, TS, OCD, and PANDAS.
• Understanding the autoimmune basis of these conditions may lead to novel therapeutic strategies.
• This research contributes to the broader understanding of autoimmune encephalitis and movement disorders.