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J Immunol. 2016 Feb 15;196(4):1910-21. doi: 10.4049/jimmunol.1501165. Epub 2016 Jan 20.

Galectin-1 Couples Glycobiology to Inflammation in Osteoarthritis through the Activation of an NF-κB-Regulated Gene Network.

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Karl Chiari Lab for Orthopaedic Biology, Department of Orthopaedics, Medical University of Vienna, 1090 Vienna, Austria;
Karl Chiari Lab for Orthopaedic Biology, Department of Orthopaedics, Medical University of Vienna, 1090 Vienna, Austria;
Institute of Physiological Chemistry, Faculty of Veterinary Medicine, Ludwig-Maximilians-University Munich, 80539 Munich, Germany;
Department of Laboratory Medicine and Core Facility Genomics, Core Facilities, Medical University of Vienna, 1090 Vienna, Austria;
Center for Medical Statistics, Informatics, and Intelligent Systems, Medical University Vienna, 1090 Vienna, Austria; and.
B2 Scientific Group, 1180 Vienna, Austria.


Osteoarthritis is a degenerative joint disease that ranks among the leading causes of adult disability. Mechanisms underlying osteoarthritis pathogenesis are not yet fully elucidated, putting limits to current disease management and treatment. Based on the phenomenological evidence for dysregulation within the glycome of chondrocytes and the network of a family of adhesion/growth-regulatory lectins, that is, galectins, we tested the hypothesis that Galectin-1 is relevant for causing degeneration. Immunohistochemical analysis substantiated that Galectin-1 upregulation is associated with osteoarthritic cartilage and subchondral bone histopathology and severity of degeneration (p < 0.0001, n = 29 patients). In vitro, the lectin was secreted and it bound to osteoarthritic chondrocytes inhibitable by cognate sugar. Glycan-dependent Galectin-1 binding induced a set of disease markers, including matrix metalloproteinases and activated NF-κB, hereby switching on an inflammatory gene signature (p < 10(-16)). Inhibition of distinct components of the NF-κB pathway using dedicated inhibitors led to dose-dependent impairment of Galectin-1-mediated transcriptional activation. Enhanced secretion of effectors of degeneration such as three matrix metalloproteinases underscores the data's pathophysiological relevance. This study thus identifies Galectin-1 as a master regulator of clinically relevant inflammatory-response genes, working via NF-κB. Because inflammation is critical to cartilage degeneration in osteoarthritis, this report reveals an intimate relation of glycobiology to osteoarthritic cartilage degeneration.

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