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Pubmed ID :28887209
Publication Date : //

Thyroid-associated orbitopathy and tears: A proteomics study.


To date, Thyroid-Associated Orbitopathy (TAO), an autoimmune inflammatory disease affecting the eye, remains poorly characterised and its diagnosis challenging. The aim of this study was to investigate the tears of the TAO patients in order to identify potential biomarkers. Two independent quantitative Tandem Mass Tag™ 6-plex experiments were done. After in-solution digestion and isoelectric fractionation, the 12 fractions were analysed with a LTQ Orbitrap Velos coupled to a liquid chromatography. Raw files were searched against Swiss-Prot-AC database using Proteome Discoverer software, with a false discovery rate of 1% at peptide and protein levels. The differential proteins were then verified using orthogonal approaches in independent patients. Globally, 712 tear proteins were quantified with 2 unique peptides. Interestingly, cystatin c (TAO/controls ratio: 1.53), alpha-1 antichymotrypsin (ratio: 1.70) and retinal dehydrogenase (ratio: 0.68), displaying differential levels in the tears of TAO patients using proteomics experiments emerged as highly promising biomarkers after verification. In conclusion, this proteomics study supports the idea that tears reflect biological modifications occurring in a disease context and can therefore be a promising fluid for biomarker discovery. Moreover, our study identified three candidates that could in the future open new avenues in the diagnosis of TAO disease.

Authors : Kishazi Edina , Dor Marianne , Eperon Simone , Oberic Aurélie , Hamedani Mehrad , Turck Natacha ,

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