OBJECTIVE: To measure concentrations of the thrombin-cleaved isoform of osteopontin (OPN) in urine and plasma of patients with rheumatoid arthritis (RA), and to assess whether levels of thrombin-cleaved OPN are associated with measures of RA. METHODS: Subjects comprised 70 patients with RA, 20 patients with osteoarthritis (OA), and 46 healthy controls. RA disease activity was evaluated by tender joint count, swollen joint count, patient's global assessment of disease activity, erythrocyte sedimentation rate (ESR), and levels of C-reactive protein (CRP), matrix metalloproteinase-3 (MMP-3), and rheumatoid factor (RF), as well as 28-joint count Disease Activity Score (DAS28). OPN levels in plasma and urine were measured by ELISA. RESULTS: Median levels of thrombin-cleaved OPN in urine (U-half) were significantly higher in RA patients (143.5 pmol/mmol Cr) than in healthy controls (67.9 pmol/mmol Cr) or OA patients (69.8 pmol/mmol Cr). Thrombin-cleaved OPN was not detected in plasma. U-half levels correlated significantly with levels of CRP (r = 0.26, p = 0.03), ESR (r = 0.26, p = 0.03), and RF (r = 0.28, p = 0.03). Median U-half levels were significantly higher in patients with stage III (249.9 pmol/mmol Cr) and IV (251.6 pmol/mmol Cr) disease than in patients with stage I (98.6 pmol/mmol Cr) disease. CONCLUSION: Our results suggest that urine levels of the thrombin-cleaved isoform of OPN may reflect the severity of active inflammatory arthritis in patients with RA.
OBJECTIVE: To measure concentrations of the thrombin-cleaved isoform of osteopontin (OPN) in urine and plasma of patients with rheumatoid arthritis (RA), and to assess whether levels of thrombin-cleaved OPN are associated with measures of RA. METHODS: Subjects comprised 70 patients with RA, 20 patients with osteoarthritis (OA), and 46 healthy controls. RA disease activity was evaluated by tender joint count, swollen joint count, patient's global assessment of disease activity, erythrocyte sedimentation rate (ESR), and levels of C-reactive protein (CRP), matrix metalloproteinase-3 (MMP-3), and rheumatoid factor (RF), as well as 28-joint count Disease Activity Score (DAS28). OPN levels in plasma and urine were measured by ELISA. RESULTS: Median levels of thrombin-cleaved OPN in urine (U-half) were significantly higher in RApatients (143.5 pmol/mmol Cr) than in healthy controls (67.9 pmol/mmol Cr) or OApatients (69.8 pmol/mmol Cr). Thrombin-cleaved OPN was not detected in plasma. U-half levels correlated significantly with levels of CRP (r = 0.26, p = 0.03), ESR (r = 0.26, p = 0.03), and RF (r = 0.28, p = 0.03). Median U-half levels were significantly higher in patients with stage III (249.9 pmol/mmol Cr) and IV (251.6 pmol/mmol Cr) disease than in patients with stage I (98.6 pmol/mmol Cr) disease. CONCLUSION: Our results suggest that urine levels of the thrombin-cleaved isoform of OPN may reflect the severity of active inflammatory arthritis in patients with RA.
Authors: Devanshi Seth; Alastair Duly; Paul C Kuo; Geoffrey W McCaughan; Paul S Haber Journal: World J Gastroenterol Date: 2014-09-28 Impact factor: 5.742
Authors: Jani Luukkonen; Laia Mira Pascual; Christina Patlaka; Pernilla Lång; Sanna Turunen; Jussi Halleen; Tomi Nousiainen; Maarit Valkealahti; Juha Tuukkanen; Göran Andersson; Petri Lehenkari Journal: PLoS One Date: 2017-08-08 Impact factor: 3.240
Authors: Brian M Nolen; Lidiya S Orlichenko; Adele Marrangoni; Liudmila Velikokhatnaya; Denise Prosser; William E Grizzle; Kevin Ho; Frank J Jenkins; Dana H Bovbjerg; Anna E Lokshin Journal: PLoS One Date: 2013-05-28 Impact factor: 3.240