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Antibodies against proinsulin and homologous MAP epitopes are detectable in Hashimoto’s thyroiditis Sardinian patients, an additional link of association

Niegowska, Magdalena and Paccagnini, Daniela and Burrai, Carlo and Palermo, Mario and Sechi, Leonardo Antonio (2015) Antibodies against proinsulin and homologous MAP epitopes are detectable in Hashimoto’s thyroiditis Sardinian patients, an additional link of association. PLoS One, Vol. 10 (7), e0133497. ISSN 1932-6203. Article.

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DOI: 10.1371/journal.pone.0133497

Abstract

Hashimoto’s thyroiditis (HT) is the prevailing organ-specific autoimmune disease in Sardinia, often complicated with other autoimmune disorders, most commonly type 1 diabetes (T1D). While numerous studies describe levels of anty-thyroid antibodies (Abs) in T1D patients, few papers evaluate the status of anti-islet autoimmunity in subjects affected by HT. Previously, we portrayed Mycobacterium avium subspecies paratuberculosis (MAP) as an environmental factor strongly associated with both diseases. In this study, we analyzed plasma of Sardinian HT patients (n=177) and healthy controls (HCs; n=175) for the presence of Abs against proinsulin and MAP-derived homologous epitopes: MAP1,4αgbp157-173/PI64-80 were recognized by 5,08% and 18,64% of HT vs 0,57% and 7,43% of HCs (AUC=0,6 for both; p <0,0003 and 0,002, respectively), whereas the prevalence of Abs against MAP2404c70-85/PI46-61 peptides was higher but not significant in patients when compared to HCs. In women (n=152), Abs against MAP1,4αgbp157-173 were detected in 12,50% of HT vs 2,75% of HCs (AUC=0,63; p <0,0002), while positivity to its human homolog PI64-80 was observed in 16,42% of HT vs 6,42% of HCs (AUC=0,61; p <0,001). In men (n=25), a significant anti-PI46-61 Abs levels were detected in 4% of HT vs none of the HCs (AUC=0,7; p <0,003). Age-related analyses revealed the highest prevalence between 31-40 years old (45,83%) in the total study population and among males (33,33%); in contrast, women had a higher seroreactivity between 51-60 years (42,11%). A further follow-up and determination of anti-islet Abs levels is needed to evaluate the association of immune responses directed against the MAP/PI homologous peptides with progression to overt diabetes in HT subjects.

Item Type:Article
ID Code:11767
Status:Published
Refereed:Yes
Uncontrolled Keywords:Peptide mapping, autoimmune diseases, age groups, diabetes mellitus, thyroid, insulin, thyroid-stimulating hormone, zinc
Subjects:Area 06 - Scienze mediche > MED/07 Microbiologia e microbiologia clinica
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > Azienda ASL1, Sassari
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze Biomediche
Publisher:Public Library of Science
ISSN:1932-6203
Copyright Holders:© 2015 Niegowska et al.
Deposited On:14 Jun 2017 17:04

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