AB1090 BIOMARKERS TO DIFFERENTIATE EARLY INDISTINGUISHABLE CASES OF OSTEOARTHRITIS AND RHEUMATOID ARTHRITIS.
Authors: A. Elbeialy, H. El Abd, A. Shahin, R. Ibrahim
Journal: Annals of the Rheumatic Diseases (2020)

Background: Osteoarthritis (OA) and rheumatoid arthritis (RA) are the most frequent inflammatory diseases of the musculoskeletal system, which could not be differentiated in their early stages, and characterized by degradation of articular cartilage and impairment of joint function. Sometimes, criteria and radiography are not insufficient to distinguish early-stages of RA and OA and predict disease course, and therefor biomarkers that help clinicians to early diagnose disease are essential. Objectives: The aim of this study is to estimate serum level of Matrix metalloproteinase 3 (MMP3) and hrdroxyproline (HP) in early RA and OA patients to see if they can be used to differentiate both diseases at their early stages Methods: The aim of this study is to estimate serum level of Matrix metalloproteinase 3 (MMP3) and hrdroxyproline (HP) in early RA and OA patients to see if they can be used to differentiate both diseases at their early stages Results: We found a highly significant elevation of serum MMP3 in OA patients group compared to RA patients and control groups. We also found a highly significant elevation of MMP3 in RA patients than control group,(P &lt; 0.001). Meanwhile, we found a highly significant elevation of HP in OA patients than in RA patients and control groups, (P &lt; 0.001), whereas there was no significant difference between HP in RA patients and control groups (P &gt; 0.05). Table 1. Demonstration of serum levels of MMP3 and HP in all groups. “Enzyme” OA (n=40 ) RA (n=40 ) Control (n=40 ) p-value MMP3 pg/mL 559.92±1112.84 153.25±162.05 59.79±63.54 &lt;0.001 HP µg/mL 12.87±18.75 4.81±6.89 4.52±1.55 &lt;0.001 HP µg/mL 4.81±6.89 4.52±1.55 &gt; 0.05 Conclusion: Our results suggest that serum levels of Hydroxyproline (HP) rather than MMP3 could be used as a potential biomarker for early differentiation between osteoarthritis (OA) and rheumatoid arthritis (RA) when diagnostic criteria failed to be fulfilled. References: [1]Benedetti S, Canino C, Tonti G, Medda V, Calcaterra P, Nappi G, Salaffi F, Canestrari F. (2010): Biomarkers of oxidation, inflammation and cartilage degradation in osteoarthritis patients undergoing sulfur-based spatherapies. ClinBiochem.; 43: 973-8. [2]Fenton, S. A. M., Veldhuijzen van Zanten, J. J. C. S., Duda, J. L., Metsios, G. S., and Kitas, G. D. (2018). Sedentary behaviour in rheumatoid arthritis: definition, measurement and implications for health. Rheumatology. (Oxford) 57(2), 213-226. [3]Murphy, G., and Nagase, H. (2008). Progress in matrix metalloproteinase research. Mol. Aspects Med. 29(5), 290-308. [4]Bonnans, C., Chou, J., and Werb, Z. (2014). Remodelling the extracellular matrix in development and disease. Nat. Rev. Mol. Cell Biol. 15(12), 786-801. [5]Hofman, K., Hall, B., Cleaver, H., &amp; Marshall, S. (2011): High-throughput quantification of hydroxyproline for determination of collagen. Analytical biochemistry, 417(2), 289-291. [6]Barranco, C. (2015): Osteoarthritis: activate autophagy to prevent cartilage degeneration? Nat. Rev. Rheumatol. 11, 127. [7]M.S. Radha and Dr. M.R. Gangadhar (2015), Serum enzyme of matrix metalloproteinase-3 in patients with knee osteoarthritis, International Journal of Recent Scientific Research Vol. 6, Issue, 6, pp.4457-4460, June, 2015. [8]Bassiouni, H. M., El-Deeb, M., Kenawy, N., Abdul-Azim, E., &amp; Khairy, M. (2011). Phonoarthrography, musculoskeletal ultrasonography, and biochemical biomarkers for the evaluation of knee cartilage in osteoarthritis. Modern rheumatology, 21(5), 500-508. [9]Ahmed, U., Anwar, A., Savage, R. S., Costa, M. L., Mackay, N., Filer, A., Raza, K., Watts, R. A., Winyard, P. G., Tarr, J., Haigh, R. C., Thornalley, P. J., and Rabbani, N. (2015). Biomarkers of early stage osteoarthritis, rheumatoid arthritis and musculoskeletal health. Sci. Rep. 5, 9259. Acknowledgments: We are indebted to Dr El Shaimaa Abdel Hakim, and Dr Asmaa Fouaad for their great help in this study Disclosure of Interests: None declared