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- W1966763915 abstract "The tumor-promotor phorbol dibutyrate (PDBt) increases the binding of a neoglycoprotein containing mannose 6-phosphate (Man6P) and of insulin-like growth factor II (IGF-II) to the Man6P/IGF-II receptor at the cell surface. This effect is dependent on time and concentration and is also seen with synthetic 1-oleoyl-2-acetyl-sn-glycerol, but not with 4α-phorbol, an inactive tumor-promoter. The increase is due to a 3–4 fold increase in the number of cell-surface, receptors, accompanied by a 1.6-fold increase in ligand-binding affinity. The internalization rate of the Man6P/IGF-II receptor is not affected by PDBt, suggesting that the redistribution of these receptors to the cell surface is due to an accelerated externalization rate. The redistribution of Man6P/IGF-II receptors did not impair the sorting of newly synthesized Man6P-containing ligands while uptake of these ligands is 2–4-fold increased. Inactivation or down regulation of protein kinase C decreased the binding of the Man6P-containing neoglycoprotein to 65% of controls. Incubation of cells with Man6P, IGF-I, IGF-II or epidermal growth factor induces a rapid redistribution of Man6P/IGF-II receptors to the plasma membrane [Braulke, T., Tippmer, S., Neher, E. & von Figura, K. (1989) EMBO J. 8, 681–686]. Incubation with PDBt prevented the effect of growth factors but not that of Man6P on receptor redistribution. Inactivation of protein kinase C did not affect the Man6P/IGF-II receptor redistribution induced by Man6P and growth factors. These data suggest that Man6P, growth factors and activation of protein kinase C by phorbol esters and diacylglycerols modulate Man6P/IGF-II receptor cell-surface binding by at least two independent mechanisms, receptor redistribution as well as an increase of binding affinity, which might be involved in regulation of endocytosis of ligands." @default.
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- W1966763915 date "1990-05-01" @default.
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- W1966763915 title "Regulation of mannose 6-phosphate/insulin-like growth factor II receptor distribution by activators and inhibitors of protein kinase C" @default.
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- W1966763915 doi "https://doi.org/10.1111/j.1432-1033.1990.tb15529.x" @default.
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