Association of antibody titers and 5-HTTLPR gene polymorphisms in pediatric autoimmune neuropsychiatric disorder associated with streptococci

Alma Delia Genis-Mendoza, Humberto Nicolini, Viana Manrique, Lilia López-Canovas, Brenda Cabrera-Mendoza, María Antonieta Bobes, Nuria Lanzagorta, Daniel Santana

DOI: https://doi.org/10.17711/SM.0185-3325.2020.025

Abstract


Introduction. It has been hypothesized that pediatric autoimmune neuropsychiatric disorder associated with streptococcal infections (PANDAS) etiology results from an abnormal immune response to streptococcal infection. There is evidence that the serotonergic system is involved in both obsessive-compulsive disorder (OCD) physiopathology and immunological processes. In the 5’ promoter region of 5-HTT, gene encoding for the serotonin transporter we can find the 5-HTTLPR polymorphism that has been associated with OCD. Being PANDAS a disorder with OCD symptoms and likely immune abnormalities, 5-HTT polymorphisms may be particularly relevant for this disorder.

Objective. This study aimed to test the association between the 5-HT genotypes and the presence of serum antibodies in patients with PANDAS.

Method. We compared the genotype frequencies and serum anti-streptococcal, anti-neural, and anti-enolase antibodies titers between 56 patients with PANDAS and 20 healthy controls from Mexico and Cuba.

Results. Antibody titers were higher (anti-enolase, anti-streptococcal) in PANDAS patients compared to healthy controls. No differences in anti-neural antibody levels between both groups were detected. The anti-enolase and anti-neural antibody titer increased according to the polymorphism of the PANDAS patients as follows: LL >SL >SS.

Discussion and conclusion. This is the first study evaluating the association between the 5-HTTLPR genotypes and antibody titers in PANDAS patients. Associations between polymorphisms in serotonergic genes and immune response could provide valuable information about the interaction between both systems. Our results suggest an association between the S allele and elevated antibody levels in PANDAS patients.

Keywords


Keywords: Autoantibodies; obsessive-compulsive disorder; serotonin; PANDAS; 5HTT

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