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• W2129152034 abstract "The insulin-like growth factors (IGFs) have paradoxical effects on skeletal myoblast differentiation. While low concentrations of IGF stimulate myoblast differentiation, high concentrations of IGF induce a progressive decrease in myoblast differentiation. The mechanism of this inhibition is unknown. Using a retroviral expression vector, we developed a subline of mouse P2 mouse myoblasts (P2-LISN) which expressed 7.5 times higher levels of type-1 IGF receptors than control (P2-LNL6) myoblasts, which were infected with a virus lacking the type-1 IGF receptor sequence. Overexpression of the type-1 IGF receptor caused the IGF dose-response curves of stimulation and progressive inhibition of differentiation to shift to the left. Additionally, at high insulin and IGF-I concentrations, complete inhibition of P2-LISN myoblast differentiation occurred. These results suggest that inhibition of differentiation at high ligand concentrations was not due to the primary involvement of other species of receptors for IGF. Type-1 IGF receptor downregulation as a mechanism for inhibition of differentiation was also ruled out since P2-LISN myoblasts constitutively expressed high levels of type-1 IGF receptors. Additionally, inhibition of differentiation at high concentrations of IGF-I was not correlated with overt stimulation of proliferation or with IGF binding protein (IGF-BP) release into the culture medium. These results indicate that the type-1 IGF receptor mediates two conflicting signal pathways in myogenic cells, differentiation-inducing and differentiation-inhibitory, which predominate at different ligand concentrations. © 1993 Wiley-Liss, Inc." @default.
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• W2129152034 date "1993-09-01" @default.
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• W2129152034 title "Ligand-dependent inhibition of myoblast differentiation by overexpression of the type-1 insulin-like growth factor receptor" @default.
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• W2129152034 doi "https://doi.org/10.1002/jcp.1041560304" @default.
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