Abstract
Aim: The clinical symptoms and laboratory markers of Rheumatoid Arthritis
(RA) and Psoriatic Arthritis (PsA) can be very similar, so making a differential diagnosis
between these two diseases is often difficult. Serological parameters to be used in differential
diagnosis can guide the clinician. This study aimed to investigate the usability
of 14-3-3η (eta) protein as a biomarker in the differential diagnosis of PsA and RA, and
the relationships between eta protein and disease activity scores and joint erosions in
PsA and RA.
Methods: 54 PsA patients, 53 RA patients, and 56 healthy individuals were included in
this study. The ELISA (Enzyme-Linked ImunoSorbent Assay) kit was used as a quantitative
sandwich enzyme immunoassay technique to detect human eta protein levels. Receiver-
operating Characteristic (ROC) curves analysis was used to determine the sensitivity
and specificity of the eta protein.
Results: Eta protein levels were found to be significantly higher in the RA group than in
the PsA [B: -0.341, OR (95% CI): 0.711 (0.556-0.909), p: 0.007] and control [B: -0.225,
OR (95% CI): 0.798 (0.641-0.995), p: 0.045] groups. Eta protein median values were significantly
higher in patients with joint erosion than in those without [β= 0.151, OR (95%
CI): 1.163 (1.003-1.349), p: 0.046].
Conclusion: Eta protein levels are higher in the serum of RA patients than PsA and are
associated with joint erosion. Eta protein may be a potential biomarker in the differential
diagnosis of RA and PsA. It may represent a possible therapeutic step in the pathophysiological
pathways in the development of joint erosion.
Keywords:
14-3-3η protein, rheumatoid arthritis, psoriatic arthritis, joint erosion, disease activity, visual analog scale.
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