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• W1967025304 endingPage "1103" @default.
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• W1967025304 abstract "The embryonal carcinoma-derived cell line, ATDC5, differentiates into chondrocytes in response to insulin/insulin-like growth factor-I (IGF-I) stimulation. In the present study, we examined whether insulin/IGF-I stimulation caused activation of the phosphoinositide 3-kinase (PI3K)/protein kinase B (PKB) pathway in ATDC5 cells. We also determined whether the insulin-stimulated differentiation of ATDC5 cells into chondrocytes could be mimicked by activation of the PKB pathway alone. ATDC5 cells produced phosphatidylinositol 3,4,5-trisphosphate and the pleckstrin homology domain of PKB was recruited to the plasma membrane in response to insulin stimulation. This was probably a result of activation of PI3K because the PI3K inhibitors, wortmannin and LY294002, inhibited both responses, although the effective concentrations were as high as 10 μM. Insulin stimulation caused the chondrogenic differentiation of ATDC5 cells as assessed by chondrogenic nodule staining with alcian blue. The addition of wortmannin or LY294002, PI3K inhibitors, suppressed the staining, and the suppression was reversible, indicating the effect of the inhibitors is not toxic. Finally, we exogenously expressed a constitutively-activated from of PKB (myristoylated PKB, myr-PKB) in ATDC5 cells, and found the chondrogenic differentiation of ATDC5 cells to form nodules occurred in the absence of insulin stimulation. The kinase-negative mutant of myr-PKB did not caused differentiation, indicating that kinase activity is required. These results support the hypothesis that the PI3K/PKB signaling pathway is involved in the chondrogenic differentiation of ATDC5 cells in response to insulin/IGF-I stimulation. This is the first report that demonstrates the involvement of phosphoinositide signaling in the induction of chondrogenesis from undifferentiated cells." @default.
• W1967025304 created "2016-06-24" @default.
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• W1967025304 date "2001-11-01" @default.
• W1967025304 modified "2023-10-17" @default.
• W1967025304 title "Involvement of the phosphoinositide 3-kinase/protein kinase B signaling pathway in insulin/IGF-I-induced chondrogenesis of the mouse embryonal carcinoma-derived cell line ATDC5" @default.
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• W1967025304 doi "https://doi.org/10.1016/s1357-2725(01)00067-x" @default.
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