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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The first author gratefully acknowledges Academia Cuf/José de Mello Saúde and Sociedade Portuguesa de Reumatologia for its financial support.
The project was partially financed by Academia Cuf/José de Mello Saúde, Carnaxide, Portugal, and Sociedade Portuguesa de Reumatologia, Lisbon, Portugal.
Conflict of interest
The authors have declared no conflicts of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This study was approved by the Ethics committee of Hospital Cuf Descobertas, 8/09/2014, Ethics committee of Instituto Português de Reumatologia, 3/07/2015 and NOVA Medical School Ethics (no. 17/2016/CEFCM). All patients have signed an informed consent to participate according to the Declaration of Helsinki.
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Barcelos, F., Martins, C., Papoila, A. et al. Association between memory B-cells and clinical and immunological features of primary Sjögren’s syndrome and Sicca patients. Rheumatol Int 38, 1063–1073 (2018). https://doi.org/10.1007/s00296-018-4018-0
- Sjögren’s syndrome
- Flow cytometry
- Memory B cells