Metabolomics with severity of radiographic knee osteoarthritis and early phase synovitis in middle-aged women from the Iwaki Health Promotion Project: a cross-sectional study

• Published in: Arthritis research & therapy Vol. 24; no. 1; pp. 1 - 145
• Main Authors: Sasaki, Eiji, Yamamoto, Hiroyuki, Asari, Toru, Matsuta, Rira, Ota, Seiya, Kimura, Yuka, Sasaki, Shizuka, Ishibashi, Kyota, Yamamoto, Yuji, Kami, Kenjiro, Ando, Masataka, Tsuda, Eiichi, Ishibashi, Yasuyuki
• Format: Journal Article
• Language: English
• Published: London BioMed Central Ltd 17.06.2022; BioMed Central; BMC
• Subjects: Analysis; Arthritis; Biomarkers; Capillary electrophoresis; Care and treatment; Cohort analysis; Cohort study; Cross-sectional studies; Diagnosis; Disease; Etiology; Health aspects; Health care; Health promotion; Knee osteoarthritis; Magnetic resonance imaging; Metabolism; Metabolites; Metabolome analysis; Metabolomics; Methods; Middle age; Middle aged women; Orthopedics; Osteoarthritis; Plasma; Preventive medicine; Public health; Radiographic osteoarthritis; Risk factors; Synovitis; Time-of-flight mass spectrometry; Women; Womens health; Japan
• ISSN: 1478-6362; 1478-6354; 1478-6362
• DOI: 10.1186/s13075-022-02830-w

Abstract Background Osteoarthritis (OA) is one of the costliest and most disabling forms of arthritis, and it poses a major public health burden; however, its detailed etiology, pathophysiology, and metabolism remain unclear. Therefore, the purpose of this study was to investigate the key plasma metabolites and metabolic pathways, especially focusing on radiographic OA severity and synovitis, from a large sample cohort study. Methods We recruited 596 female volunteers who participated in the Iwaki Health Promotion Project in 2017. Standing anterior-posterior radiographs of the knee were classified by the Kellgren-Lawrence (KL) grade. Radiographic OA was defined as a KL grade of ≥ 2. Individual effusion-synovitis was scored according to the Whole-Organ Magnetic Resonance Imaging Scoring System. Blood samples were collected, and metabolites were extracted from the plasma. Metabolome analysis was performed using capillary electrophoresis time-of-flight mass spectrometry. To investigate the relationships among metabolites, the KL grade, and effusion-synovitis scores, partial least squares with rank order of groups (PLS-ROG) analyses were performed. Results Among the 82 metabolites examined in this assay, PLS-ROG analysis identified 42 metabolites that correlated with OA severity. A subsequent metabolite set enrichment analysis using the significant metabolites showed the urea cycle and tricarboxylic acid cycle as key metabolic pathways. Moreover, further PLS-ROG analysis identified cystine ( p = 0.009), uric acid ( p = 0.024), and tyrosine ( p = 0.048) as common metabolites associated with both OA severity and effusion-synovitis. Receiver operating characteristic analyses showed that cystine levels were moderately associated with radiographic OA ( p < 0.001, area under the curve 0.714, odds ratio 3.7). Conclusion Large sample metabolome analyses revealed that cystine, an amino acid associated with antioxidant activity and glutamate homeostasis, might be a potential metabolic biomarker for radiographic osteoarthritis and early phase synovitis.