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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
REVIEW
Wnt-beta-catenin signaling in the pathogenesis of osteoarthritis.
Nature Clinical Practice. Rheumatology 2008 October
Osteoarthritis (OA) is a progressively degenerative joint condition that is influenced by various metabolic and structural factors. The canonical Wnt-frizzled-beta-catenin pathway has been implicated in the pathogenesis of OA. Products of the Wnt, frizzled, secreted frizzled-related protein (sFRP), Dickkopf and LDL-receptor-related protein gene families have crucial roles in the development and maintenance of bone, cartilage and joints. Increased levels of beta-catenin have been observed in degenerative cartilage, suggesting that a diminished capacity to limit Wnt signaling might contribute to cartilage loss. Polymorphisms in genes involved in Wnt signaling-particularly in the gene encoding sFRP-3-are associated with an increased susceptibility to the development of OA. At least one of these polymorphisms in the gene encoding sFPR-3 is associated with a reduced ability to limit beta-catenin signaling. In addition, the canonical Wnt signaling pathway is influenced by local factors, including alterations in glycosaminoglycan sulfation, cartilage matrix content, transforming growth factor beta and vitamin D. A higher circulating level of the Wnt inhibitor Dickkopf-1, for instance, is associated with slowed progression of hip OA. Hence, the sum of local and systemic factors contributes to the outcome of the Wnt-frizzled pathways. Further investigation is needed to fully define the role of Wnt signaling in OA.
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