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• W2077054169 abstract "Adult mesenchymal stem cells (MSCs) are under investigation as an alternative cell source for the engineering of cartilage tissue in three-dimensional (3D) scaffolds. However, little is known about the intracellular mechanisms involved in the chondrogenic differentiation of MSCs. This study investigated the signaling pathways evoked by TGF-beta1 and IGF-1 that mediated chondrogenic differentiation in adult rat bone-marrow derived MSCs in (i) monolayer on plastic and (ii) a 3D collagen-GAG scaffold. The data demonstrated involvement of the p38 pathway, but not ERK1/2 or PI3K in TGF-beta1-induced chondrogenic differentiation in monolayer. Similarly, when the MSCs were seeded onto a collagen-GAG scaffold and treated with TGF-beta1, the chondrogenic differentiation was dependent upon p38. In contrast, IGF-1-induced chondrogenic differentiation in monolayer involved p38, ERK1/2, as well as PI3K. The phosphorylation of Akt occurred downstream of PI3K and phospho-Akt was found to accumulate in the nucleus of IGF-1-treated cells. When MSCs were seeded onto the collagen-GAG scaffold and exposed to IGF-1, PI3K was required for chondrogenesis. These findings highlight the respective and differential involvement of p38, ERK1/2 and PI3K in growth factor-induced chondrogenesis of MSCs and demonstrates that intracellular signaling pathways are similar when differentiation is stimulated in a 2D or 3D environment." @default.
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• W2077054169 date "2008-04-01" @default.
• W2077054169 modified "2023-10-09" @default.
• W2077054169 title "A comparison of the involvement of p38, ERK1/2 and PI3K in growth factor-induced chondrogenic differentiation of mesenchymal stem cells" @default.
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• W2077054169 doi "https://doi.org/10.1016/j.bbrc.2008.01.160" @default.
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