Session Type: ACR Poster Session C
Session Time: 9:00AM-11:00AM
Background/Purpose: Monocytes of patients with Ankylosing Spondylitis (AS) show Toll-like receptor 4 (TLR4) over-expression. Myeloid-related proteins (MRP) 8/14 protein complexes are calcium-binding proteins, which act as endogenous ligands to TLR4. Thus we studied the levels of MRP8/14 in adult AS patients.
Methods: MRP8/14 levels were assessed in 99 adult AS patients satisfying ASAS 2010 criteria and 23 healthy controls by ELISA. Patient disease parameters like patient and physician global assessment, BASDAI, swollen and tender joint count, entheseal count by Maastricht Enthesitis index, Erythrocyte Sedimentation Rate (ESR) and C Reactive Protein (CRP) were also recorded. Levels were reassessed in 23 patients after 2-5 months of treatment with NSAIDs. All values are in median and IQR.
Results: The median serum MRP8/14 levels in patients [34.1 (17.94-264.58) mg/ml] were significantly higher than in healthy controls [5.97 (IQR 4.64-11.43) mg /ml (p<0.0001)]. Patients with peripheral arthritis (n=50) had higher levels than those with pure axial disease (n=49) [40.63 (IQR 28.41-73.15) mg /ml vs. 23.72 (11.04-61.55) mg /ml; p=0.012]. Levels of MRP8/14 correlated with ASDAS CRP (r=0.23, 95%CI=0.038-0.422, p=0.02) and CRP (r=0.28, 95%CI=0.081-0.45, p=0.01), and the correlation was better in early disease [≤5 years disease duration, (r=0.40, p=0.007) and (r=0.57, p=<0.0001) respectively]. MRP8/14 levels did not correlate with clinical disease activity measures such as BASDAI, Maastricht entheseal count, and patient and physician global assessment. Baseline levels were higher in treatment responders than in non-responders [51.17 vs. 32.22 mg /ml; p=0.02]. Change in MRP8/14 levels correlated with change in BASDAI and ASDAS CRP (r= 0.489, p=0.018 and r=0·498, p=0.016 respectively).
Conclusion: MRP8/14 levels may be used as a biomarker for activity, peripheral arthritis and response to therapy.
To cite this abstract in AMA style:Gupta L, Bhattacharya S, Agarwal V, Aggarwal A. Elevated Levels of Serum Myeloid Related Protein 8/14 in Ankylosing Spondylitis: Associated with Peripheral Arthritis and Active Disease [abstract]. Arthritis Rheumatol. 2016; 68 (suppl 10). https://acrabstracts.org/abstract/elevated-levels-of-serum-myeloid-related-protein-814-in-ankylosing-spondylitis-associated-with-peripheral-arthritis-and-active-disease/. Accessed November 30, 2020.
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ACR Meeting Abstracts - https://acrabstracts.org/abstract/elevated-levels-of-serum-myeloid-related-protein-814-in-ankylosing-spondylitis-associated-with-peripheral-arthritis-and-active-disease/