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Published in: Rheumatology International 6/2018

01-06-2018 | Observational Research

Association between memory B-cells and clinical and immunological features of primary Sjögren’s syndrome and Sicca patients

Authors: Filipe Barcelos, Catarina Martins, Ana Papoila, Carlos Geraldes, Joana Cardigos, Glória Nunes, Teresa Lopes, Nuno Alves, José Vaz-Patto, Jaime Branco, Luís-Miguel Borrego

Published in: Rheumatology International | Issue 6/2018

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Abstract

B-cells play a pivotal role in primary Sjögren’s syndrome (pSS) pathogenesis. We aim to (1) evaluate the distribution of B-lymphocyte subpopulations in pSS and Sicca patients, (2) establish cut-off points that discriminate pSS from controls, (3) evaluate the association between memory B-cells and phenotypic features in pSS. We included 57 pSS patients, 68 Sicca and 24 healthy controls. Circulating B-cells were characterized by flow cytometry as naïve and memory subsets and classified from Bm1 to Bm5. Compared to controls, pSS patients had lower percentages (29.5 vs 44.4%) and absolute numbers (47 vs 106 cells/µl) of memory B-cells. Through ROC curves, a cut-off of ≤ 58 total memory B-cells/µl yielded a specificity of 0.88 and a sensitivity of 0.60 for pSS, and was met by 59.6% of pSS patients, 38.8% of Sicca and 12.5% of controls. A cut-off of < 23.5 Switched-memory B-cells/µl yielded a specificity of 0.88 and a sensitivity of 0.54 and was met by 54.4% of pSS patients, 37.3% of Sicca and 12.5% of controls. In pSS, lower total memory B-cells count was associated with longer disease duration (14.3 vs 8.1 years, p = 0.006) and more active disease profile, as evaluated by the European League Against Rheumatism (EULAR) Sjögren’s Syndrome Disease Activity Index (ESSDAI) (3.1 vs 1.4, p = 0.043). Decreased numbers of memory B-cells clearly discriminated pSS from controls and can also have prognostic value. It remains to be clarified whether Sicca patients with decreased memory B-cells represent pSS and if B-cell profiling could help in the diagnosis of pSS.
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Metadata
Title
Association between memory B-cells and clinical and immunological features of primary Sjögren’s syndrome and Sicca patients
Authors
Filipe Barcelos
Catarina Martins
Ana Papoila
Carlos Geraldes
Joana Cardigos
Glória Nunes
Teresa Lopes
Nuno Alves
José Vaz-Patto
Jaime Branco
Luís-Miguel Borrego
Publication date
01-06-2018
Publisher
Springer Berlin Heidelberg
Published in
Rheumatology International / Issue 6/2018
Print ISSN: 0172-8172
Electronic ISSN: 1437-160X
DOI
https://doi.org/10.1007/s00296-018-4018-0

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