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Background Systemic lupus erythematosus (SLE) is a chronic autoimmune disorder with more than one organ involvement. Kidney is the foremost commonly affected one. Gelsolin is a protein that induces depolymerization of actin filaments thus preventing downstream stimulation of inflammatory reactions. The aim of this work was to detect the relation of plasma gelsolin to SLE disease activity and severity indices in order to find out if plasma gelsolin could be used as a biomarker of the disease. This study was conducted on 50 SLE female patients and 30 matched control. SLE disease activity Index (SLEDAI) and SLE damage index (SDI) were assessed. All lupus nephritis (LN) patients were subjected to an ultrasound-guided kidney biopsy. Plasma gelsolin level was measured. Results The mean age of the patients was 38.5 ± 6.3 years (26–51 years) with median disease duration of 5 (3–9.3) years. Eighteen patients had LN, 11 had cardiac manifestations and 12 had chest manifestations. The mean SLEDAI was 13.1 ± 4.5 (4–22) and the median SDI was 2 (1–3). Plasma gelsolin level was significantly lower in SLE patients (74.9 mg/l; 57.5–98.8 mg/l) compared to control (801.5 mg/l; 225–1008.3 mg/l) (p < 0.001). There were significant negative correlations of gelsolin levels with anti-ds DNA (r = − 0.63, p < 0.001), SLEDAI (r = − 0.79, p < 0.001), and SDI (r = − 0.74, p = 0.001). Plasma gelsolin level was significantly lower in SLE patients with high/very high activity grades compared to those with low and moderate (p = 0.007 and p < 0.001 respectively). A gelsolin level of ≤ 78.95 mg/l significantly predicted renal affection (p < 0.001), with a sensitivity of 100%, specificity 71.9%, and a positive predictive value 66.7%. Conclusion A decreased gelsolin level is associated with disease activity in SLE patients. Plasma gelsolin was well related to disease activity and severity with a high predictive value for renal affection comparable to anti-ds DNA titre. Plasma gelsolin is a potentially important predictive biomarker for SLE and LN.

Objectives: There is cumulative evidence in the literature supporting a potential role of faecal calprotectin (FCP) as a biomarker for gut inflammation in spondyloarthritis (SpA). However its relevance in undifferentiated SpA (USpA) is still uncertain. The aim of the current study is to assess the diagnostic significance of FCP levels in patients with differentiated and undifferentiated SpA. Material and methods: A total of 52 differentiated SpA, 33 USpA and 50 controls could be included. For all patients, clinical evaluation, routine laboratory investigations, FCP levels, and occult blood in stool were performed. When indicated imaging and/or endoscopies were performed. Results: The differentiated SpA patients were 12 (23.1%) with ankylosing spondylitis, 21 (40.4%) with psoriatic arthritis, 13 (25%) with ulcerative colitis, 5 (9.6%) with Crohn's disease (CD) and one (1.9%) with reactive arthritis. The mean FCP level in 85 patients correlated with CRP and ESR. Within the SpA group ulcerative colitis and Crohn's disease patients had increased FCP levels compared to other SpA subgroups and USpA patients (p < 0.001). The mean FCP levelwas significantly higher in the SpA patients compared to USpA and controls (p < 0.001). Conclusions: Elevated FCP levels may identify patients who are most likely to have SpA already in the unclassified phase of the disease. Further studies in different series of patients are needed to evaluate the potential diagnostic and prognostic roles of FCP in both differentiated and undifferentiated phases of the disease.

Introduction The aim of this study was to determine whether there is a relation between serum prohepcidin level and disease activity of rheumatoid arthritis (RA) and systemic lupus erythematous (SLE), and to discover whether it has a role in the anaemia of chronic disease occurring in RA and SLE patients. Patients and methods This study was carried out on 30 patients suffering from RA and 30 patients suffering from SLE. In addition, 20 healthy volunteers were recruited as controls. All patients and controls were subjected to full history taking, thorough clinical examination, locomotor system examination, assessment of the disease activity in RA patients using the Disease Activity Score-28, assessment of the disease activity in SLE patients using Systemic Lupus Erythematous Disease Activity Index, laboratory investigations, including complete blood count, erythrocyte sedimentation rate (ESR), rheumatoid factor and C-reactive protein (CRP), and measurement of serum prohepcidin levels by the enzyme-linked immunosorbant assay. Results The mean serum prohepcidin concentration was 395.2 ± 551.4 ng/ml in RA patients, whereas it was 381.5 ± 88.07 in SLE patients and 121.4 ± 11.1 ng/ml in healthy volunteers. The prohepcidin concentration correlated with the rheumatoid factor, C-reactive protein, ESR, disease duration, morning stiffness, tender joint count, swollen joint count, Larsen score, haemoglobin level and Disease Activity Score-28 in RA patients .There were positive significant correlations between the mean serum prohepcidin concentration and platelets number, haemoglobin level and ESR in SLE patients and insignificant correlations between the mean serum prohepcidin concentration and Systemic Lupus Erythematous Disease Activity Index. Conclusion Prohepcidin could be considered as a useful marker for RA, but not for SLE. Prohepcidin may have a role in anaemia of chronic disease occurring in RA and SLE.