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Autoantibodies linked to autoimmune polyendocrine syndrome type I are prevalent in Down syndrome.

Journal article
Authors Annika Söderbergh
Jan Gustafsson
Olov Ekwall
Asa Hallgren
tomas nilsson
Olle Kämpe
Fredrik Rorsman
Göran Annerén
Published in Acta paediatrica (Oslo, Norway : 1992)
Volume 95
Issue 12
Pages 1657-60
ISSN 0803-5253
Publication year 2006
Published at
Pages 1657-60
Language en
Keywords Adolescent, Adult, Autoantibodies, blood, classification, genetics, Child, Child, Preschool, Down Syndrome, complications, genetics, immunology, Female, Humans, Infant, Male, Middle Aged, Polyendocrinopathies, Autoimmune, complications, genetics, immunology
Subject categories Immunology in the medical area, Endocrinology

Abstract

BACKGROUND: Patients with Down syndrome are prone to autoimmune diseases which also occur in the recessive disease autoimmune polyendocrine syndrome type I (APS I). Since this disease is caused by mutations in the gene AIRE on chromosome 21, one might speculate that altered expression of AIRE contributes to autoimmune disease in Down syndrome. AIM: To study the prevalence of 11 well-defined autoantibodies, five of which are specific for APS I, associated with various manifestations of APS I in patients with Down syndrome. METHODS: Sera from 48 patients with Down syndrome were analysed. Autoantibodies against 21-hydroxylase, 17alpha-hydroxylase, side-chain cleavage enzyme, aromatic L-amino acid decarboxylase, cytochrome P4501A2, tyrosine hydroxylase, tryptophan hydroxylase, glutamic acid decarboxylase 65, tyrosine phosphatase IA-2 and transglutaminase were analysed using an immunoprecipitation assay, and thyroid peroxidase autoantibodies were measured using a haemagglutination assay. RESULTS: Seven of 48 patients had elevated titres of autoantibodies: one against 21-hydroxylase, three against aromatic L-amino acid decarboxylase, one against cytochrome P4501A2, one against glutamic acid decarboxylase 65 and one against tyrosine phosphatase IA-2. None of the patients had clinical or laboratory signs of disease coupled to the respective autoantibody. CONCLUSION: Four patients with Down syndrome had autoantibodies hitherto regarded as unique for APS I, which may suggest a dysregulation of AIRE.

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