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• W2079719270 abstract "RDC1 is a class A orphan G-protein coupled receptor of unknown function. The purpose of this study was to identify compound RDC1 agonists and use these as tools to determine the effect of RDC1 activation in human chondrocytes and cartilage explant tissue.Computational chemistry was employed to build a homology model of the RDC1 receptor. A virtual screen of in-house compounds was then performed and positive hits screened for their ability to invoke a Ca2+ response in a recombinant RDC1 HEK293 cell line, as measured by FLIPR. The effect of RDC1 activation on human chondrocytes and cartilage explant gene expression was determined by quantitative real-time polymerase chain reaction (PCR), and these effects validated as being mediated by RDC1 using siRNA antisense.Tissue expression profiling demonstrated that RDC1 expression was predominant in cartilage tissue. Treatment of human primary chondrocytes with RDC1 agonist induced a Ca2+ response, suggesting the receptor is active in this tissue type. Treatment for 24h with RDC1 agonist led to altered expression of a number of genes associated with chondrocyte hypertrophy and increased matrix degradation in human primary chondrocytes, and elevated total matrix metalloproteinase (MMP) activity in cartilage explant. Transfection with RDC1 siRNA caused a >90% reduction in human primary chondrocyte RDC1 expression and significantly reduced the impact of RDC1 agonist on the previously identified RDC1-regulated genes.RDC1 activation in human chondrocytes and cartilage explant leads to changes in gene expression and activity associated with chondrocyte hypertrophy, angiogenesis and increased matrix degradation, suggesting signalling via the RDC1 receptor may play an important role in the early development of osteoarthritis (OA)." @default.
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• W2079719270 date "2006-06-01" @default.
• W2079719270 modified "2023-10-01" @default.
• W2079719270 title "The orphan G-protein coupled receptor RDC1: evidence for a role in chondrocyte hypertrophy and articular cartilage matrix turnover" @default.
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• W2079719270 doi "https://doi.org/10.1016/j.joca.2006.01.007" @default.
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