Metabolic stress-induced joint inflammation and osteoarthritis

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Metabolic stress-induced joint inflammation and osteoarthritis A. Courties, O. Gualillo, F. Berenbaum, J. Sellam  Osteoarthritis and Cartilage  Volume 23, Issue 11, Pages 1955-1965 (November 2015) DOI: 10.1016/j.joca.2015.05.016 Copyright © 2015 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Major metabolic stress inducing inflammation in chondrocytes. We hypothesize that, in the metabolic OA phenotype, several pathways and metabolic stress factors are involved: (1) obesity activates chondrocytes through mechanical signals but also through adipokines (i.e., leptin and visfatin) (2) insulin resistance limits pro-anabolic effects of insulin and enhances FFA production which is also responsible for chondrocyte activation via TLR-4 (3) at end-stage, diabetes mellitus induces ROS and cytokine production triggered by hyperglycemia and AGE. All these stresses induce ROS and pro-inflammatory cytokines which both play a major role in joint inflammation, proteolytic enzymes production and subsequent cartilage degradation. RAGE: receptor for AGE; Ob-R: receptor for leptin. Osteoarthritis and Cartilage 2015 23, 1955-1965DOI: (10.1016/j.joca.2015.05.016) Copyright © 2015 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 How chronic inflammation related to obesity and metabolic syndrome could lead to osteoarthritis pain; the vicious circle of pain. Osteoarthritis and Cartilage 2015 23, 1955-1965DOI: (10.1016/j.joca.2015.05.016) Copyright © 2015 Osteoarthritis Research Society International Terms and Conditions