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Serum 14-3-3η protein is associated with clinical and serologic features of Sjögren’s syndrome in patients with systemic lupus erythematosus: a cross-sectional analysis

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Abstract

Introduction/objectives

Systemic lupus erythematosus (SLE) and Sjögren’s syndrome (SS) may coexist and carry a higher risk for future comorbidities. Although 14-3-3η protein is recently a known diagnostic marker in rheumatoid arthritis (RA), its role has not been investigated in SLE. The aim of this study was to compare serum 14-3-3η protein level in SLE and RA patients and to examine its association with clinical and laboratory features in SLE patients.

Methods

Eighty-four SLE patients and 39 RA patients were included. Sociodemographic, SLE disease activity index (SLEDAI), and damage index were assessed for SLE patients. Data about secondary SS were collected. 14-3-3η was measured by ELISA; titres above 0.19 ng/ml were considered positive.

Results

Serum 14-3-3η protein in SLE was significantly lower than in RA (0.37 ± 0.09 vs 1.5 ± 0.51; p < 0.001). 14-3-3η protein level was comparable between SLE patients with and without arthritis (0.29 ± 0.8 vs 0.15 ± 0.08 respectively; p = 0.20). Serum 14–3-3η protein level was higher in SLE with secondary SS features compared to those without (0.22 ± 0.10 IU/ml vs 0.11 ± 0.04 IU/ml; respectively, p < 0.001). There were no differences in 14–3-3η positivity for other lupus criteria or correlation of 14–3-3η titer with SLEDAI. 14–3-3η protein at 1.11 ng/mL yield a secondary SS diagnostic accuracy of 71%.

Conclusions

Serum 14–3-3η protein level is high in SLE-associated SS. The 14–3-3η protein level was able to distinguish patients with secondary SS among patients with SLE. Studying the role of 14–3-3η protein in Sjögren’s syndrome would be considered in further larger scale studies to confirm the impact of any association.

Key Points

Serum 14-3-3η protein level is significantly higher in systemic lupus patients with secondary Sjögren’s syndrome (SS) in comparison to those without.

Serum 14-3-3η protein can be used as a useful marker to distinguish patients with secondary SS among patients with systemic lupus.

14-3-3η protein level shows no difference between systemic lupus patients with and without arthritis.

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Correspondence to Nevin Hammam.

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The study conforms to the 1995 Helsinki declaration and was approved by Assiut Faculty of Medicine ethical committee. Informed consent was obtained from all patients.

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Hammam, N., Gamal, N.M., Elzohri, M.H. et al. Serum 14-3-3η protein is associated with clinical and serologic features of Sjögren’s syndrome in patients with systemic lupus erythematosus: a cross-sectional analysis. Clin Rheumatol 39, 2603–2610 (2020). https://doi.org/10.1007/s10067-020-05033-3

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