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- W2064770982 abstract "Members of both the Wnt and bone morphogenetic protein (BMP) families of signaling molecules have been implicated in the regulation of cartilage development. A key component of the Wnt signaling pathway is the cytosolic protein, beta-catenin. We have recently shown that the chondrogenic activity of BMP-2 in vitro involves the action of the cell-cell adhesion protein, N-cadherin, which functionally complexes with beta-catenin. The aim of this study is to test the hypothesis that Wnts may be involved in BMP-2 induced chondrogenesis, using an in vitro model of high-density micromass cultures of the murine multipotent mesenchymal cell line, C3H10T1/2. Expression of a number of Wnt members was detected in these cultures, including Wnt-3A and Wnt-7A, whose levels were up- and downregulated, respectively, by BMP-2. To assess the functional involvement of Wnt signaling in BMP-2 induced chondrogenesis, cultures were treated with lithium chloride, a Wnt-7A mimetic that acts by inhibiting the serine/threonine phosphorylation activity of glycogen synthase kinase-3beta (GSK-3beta). Lithium treatment significantly inhibited BMP-2 stimulation of chondrogenesis as well as GSK-3beta enzymatic activity, and decreased the levels of N-cadherin protein and mRNA. Furthermore, lithium decreased BMP-2 upregulation of total and nuclear levels of LEF-1 and beta-catenin as well as their interaction during later chondrogenesis; similarly, the interaction of beta-catenin with N-cadherin was also decreased. Interestingly, lithium treatment did not affect the ability of BMP-2 to decrease ubiquitination of beta-catenin, although it did reduce the interaction of beta-catenin with GSK-3beta during late chondrogenesis (days 9-13). We suggest that the chondro-inhibitory effect of lithium on BMP-2 induced chondrogenesis indicates antagonism between lithium-like Wnts and BMP-2 during mesenchymal condensation." @default.
- W2064770982 created "2016-06-24" @default.
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- W2064770982 date "2002-01-01" @default.
- W2064770982 modified "2023-10-18" @default.
- W2064770982 title "Wnt signaling during BMP-2 stimulation of mesenchymal chondrogenesis" @default.
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- W2064770982 doi "https://doi.org/10.1002/jcb.10091" @default.
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