AB0238 14–3–3H AND CALPROTECTIN PROTEINS IN PLASMA AS NEW BIOMARKERS IN EVALUATION OF THE ACTIVITY IN PATIENT WITH RHEUMATOID ARTHRITIS

Abstract

Background The determination of rheumatoid arthritis (RA) activity remains an important clinical task nowadays and it is a long and difficult process. There is no single approach to assess the activity of RA. The gold standard for evaluating RA activity is composite indexes, for example, DAS28. However, composite indices are not reliable in evaluation of the disease activity in patients with RA, as having a subjectity assessment. New biomarkers that reflect the immune inflammatory process in joints in RA is of great scientific importance. 14-3-3η and calprotectin markers in plasma are considered as promissing. Objectives To assess the value of 14-3-3η and calprotectin in plasma as additional markers in RA activity determination. Methods 48 patients were examined with reliable diagnosis of RA, according to the ACR 2010 criteria. The mean age was 59 years, mean duration of the disease was 12.8 years. 4 patients in the group were in remission, 2 had low degree of RA activity, 20 - moderate, 22 – high. RA activity was determined according to the DAS28 ESR index. The concentrations of 14-3-3η and calprotectin in the blood plasma were determined by ELISA (LLC «SPF «Abris+»). The obtained results were compared with laboratory (ESR, CRP) and clinical (tender joint count (TJC), swollen joint count (SJC), VAS, DAS28) parameters of RA activity. Results 14-3-3η and calprotectin proteins in plasma and ESR highly correlated with DAS28 (r = 0.84; r = 0.65; r = 0.53), while CRP had moderate correlation with RA activity (r = 0.34). 14-3-3η and calprotectin proteins had high correlation with TJC (r = 0.68; r = 0.61) and moderate correlation with SJC (r = 0.56; r = 0.41); ESR and CRP had weaker correlation (r = 0.15; r = 0.13; r = 0.02; r = 0.08) respectively. The ROC analysis showed that sensitivity, specificity, and diagnostic accuracy of high RA activity determination are significantly higher for 14-3-3η (AUC = 0.98, p It was also found, that calprotectin (AUC = 0.8, p Conclusion 14-3-3η and calprotectin proteins in plasma are new promising biomarkers of immunoinflammatory process in joints in RA assessment, because they are more sensitive and specific markers of the disease activity, than conventional acute-phase proteins ESR and CRP. Disclosure of Interests None declared