Print Email Facebook Twitter Local and systemic inflammatory lipid profiling in a rat model of osteoarthritis with metabolic dysregulation Title Local and systemic inflammatory lipid profiling in a rat model of osteoarthritis with metabolic dysregulation Author de Visser, H.M. (University Medical Center Utrecht) Mastbergen, S. C. (University Medical Center Utrecht) Ravipati, S. (University of Nottingham) Welsing, P. M.J. (University Medical Center Utrecht) Pinto, F.C. (University of Nottingham) Lafeber, F.P.J.G. (University Medical Center Utrecht) Chapman, V. (University of Nottingham) Barrett, D. A. (University of Nottingham) Weinans, Harrie (TU Delft Biomaterials & Tissue Biomechanics; University Medical Center Utrecht) Date 2018 Abstract Objective Bioactive oxidised lipids (oxylipins) are important signalling mediators, capable of modulating the inflammatory state of the joint and anticipated to be of importance in joint homeostasis and status of osteoarthritis. The aim of this study was to quantify oxylipin levels in plasma and synovial fluid from rats with experimentally induced osteoarthritis to investigate the potential role of oxylipins as a marker in the disease process of early osteoarthritis. Design Forty rats were randomly allocated to a standard or high-fat diet group. After 12 weeks, local cartilage damage was induced in one knee joint in 14 rats of each diet group. The remaining 6 rats per group served as controls. At week 24, samples were collected. Oxylipin levels were quantified by liquid chromatography–mass spectrometry. Results Overall, 31 lipid-derived inflammatory mediators were detected in fasted plasma and synovial fluid. Principal component analysis identified four distinct clusters associated with histopathological changes. Diet induced differences were evident for 13 individual plasma oxylipins, as well as 5,6-EET in synovial fluid. Surgical-model induced differences were evident for three oxylipins in synovial fluid (15-HETE, 8,9-DHET and 17R-ResolvinD1) with a different response in lipid concentrations for synovial fluid and plasma. Conclusions We demonstrate the quantification of oxidised lipids in rat plasma and synovial fluid in a model of early experimental osteoarthritis. Oxylipins in the synovial fluid that were altered as.consequence of the surgically induced osteoarthritis were not represented in the plasma. Our findings suggest differential roles of the oxylipins in the local versus peripheral compartment. To reference this document use: http://resolver.tudelft.nl/uuid:db17bd09-c208-4967-aa5a-9a1ca0d074f2 DOI https://doi.org/10.1371/journal.pone.0196308 ISSN 1932-6203 Source PLoS ONE, 13 (4) Part of collection Institutional Repository Document type journal article Rights © 2018 H.M. de Visser, S. C. Mastbergen, S. Ravipati, P. M.J. Welsing, F.C. Pinto, F.P.J.G. Lafeber, V. Chapman, D. A. Barrett, Harrie Weinans Files PDF journal.pone.0196308.pdf 1.9 MB Close viewer /islandora/object/uuid:db17bd09-c208-4967-aa5a-9a1ca0d074f2/datastream/OBJ/view