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• W2044207083 abstract "Context: Aromatic l-amino acid decarboxylase (AADC) is target of autoantibodies in autoimmune polyendocrine syndrome I (APS I), especially in patients with autoimmune hepatitis. Little information is currently available on AADC autoantibody epitopes and on the interrelation between autoantibody-mediated inhibition of enzymatic activity and epitope specificity. Design: We tested the immunoreactivity of full-length porcine AADC and of eight fragments of the enzyme with human serum from 18 patients with APS I, 199 with non-APS I autoimmune Addison’s disease, 124 with type 1 diabetes mellitus, 36 with Graves’ disease, and 141 healthy control subjects, and we evaluated the autoantibody-mediated enzymatic inhibition. Results: AADC antibodies (Ab) were detected in 12 of 18 (67%) APS I patients and in six of 199 (3%) autoimmune Addison’s disease patients. Four patients with autoimmune hepatitis were all positive for AADCAb. None of the 141 healthy control subjects, 82 patients with nonautoimmune adrenal insufficiency, 124 with type 1 diabetes mellitus, and 36 with Graves’ disease were found positive. Two epitope regions, corresponding to amino acids 274–299 (E1) and 380–471 (E2) were identified. Localization of E1 was confirmed by displacement studies with synthetic peptides corresponding to peptides of porcine AADC. All 12 AADCAb-positive APS I sera reacted with E1, and seven of 12 (58%) reacted also with E2. E2-specific, but not E1-specific, autoantibodies were associated with a significant inhibition of in vitro AADC enzymatic activity. Conclusions: We mapped the human AADCAb epitopes to the middle and COOH-terminal regions of the enzyme. Autoantibodies to the COOH-terminal region induce a significant inhibition of enzymatic activity." @default.
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• W2044207083 date "2007-03-01" @default.
• W2044207083 modified "2023-09-27" @default.
• W2044207083 title "Mapping of Human Autoantibody Epitopes on Aromaticl-Amino Acid Decarboxylase" @default.
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• W2044207083 doi "https://doi.org/10.1210/jc.2006-2319" @default.
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