Attention deficit hyperactivity disorder combined subtype and Anti-Yo antibodies

Area of Science:

• Neuroscience
• Immunology
• Pediatrics

Background:

• Neuroinflammation is implicated in ADHD pathogenesis.
• Emerging evidence suggests a potential autoimmune link involving anti-Purkinje cell antibodies in ADHD.
• This study aimed to explore this autoimmune hypothesis further, specifically investigating its association with ADHD subtypes.

Purpose of the Study:

• To confirm the presence of anti-Purkinje cell antibodies in a cohort of drug-naïve ADHD patients.
• To determine if these antibodies are associated with specific subtypes of ADHD.
• To investigate the potential role of autoimmune mechanisms in ADHD.

Main Methods:

• 112 drug-naïve Caucasian ADHD outpatients were assessed using DSM-5 criteria.
• ADHD subtypes and potential co-occurring dyslexia were evaluated.
• Indirect immunofluorescence assay was used to detect Anti-Yo (Purkinje cell cytoplasmic antibody type 1 [PCA-1]) antibodies.

Main Results:

• 49.1% of ADHD children tested positive for Anti-Yo antibodies, a lower prevalence than previously reported.
• Anti-Yo antibody positivity was significantly associated with the combined subtype of ADHD.
• No significant correlation was observed between Anti-Yo antibodies and ADHD with co-occurring dyslexia.

Conclusions:

• While the prevalence of Anti-Yo antibodies in ADHD was lower than in prior studies, the association remains noteworthy.
• The combined subtype of ADHD appears more likely to be associated with Anti-Yo antibody positivity.
• These findings suggest a potential, albeit specific, autoimmune component in certain ADHD presentations.