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• W13638220 abstract "Previously it was reported (Bremer, E.G., Schlessinger, J., and Hakomori, S.-I. (1986) J. Biol. Chem. 261, 2434-2440) that ganglioside GM3 inhibited epidermal growth factor (EGF)-stimulated phosphorylation of the EGF receptor in Triton X-100-treated preparations of human epidermoid carcinoma (A431) cell membranes. In addition, these authors reported that GM3 inhibited the growth of A431 cells. In contrast, a modified ganglioside, de-N-acetyl GM3, enhanced the EGF-dependent tyrosine kinase activity of the EGF receptor. In this work and in subsequent studies (Hanai, N., Dohi, T., Nores, G. A., and Hakomori, S.-I. (1988) J. Biol. Chem. 263, 6296-6301), the tyrosine kinase activity of the receptor from A431 cell membranes was assayed in the presence of Triton X-100. In this report, we confirm that GM3 inhibited and de-N-acetyl GM3 stimulated EGF receptor autophosphorylation in the presence of Triton X-100. However, in the absence of detergents, ganglioside GM3 inhibited EGF-stimulated receptor autophosphorylation, whereas de-N-acetyl GM3 had no effect on EGF-stimulated receptor autophosphorylation. The effects of these gangliosides on receptor autophosphorylation were measured in both A431 cell plasma membranes and in 3T3 cell membranes permeabilized to [32P]ATP by a freeze-thaw procedure, in intact A431 cells permeabilized with alamethicin, and in intact A431 cells grown in the presence of [32P]orthophosphate. Thus, the inhibitory effect of GM3 on receptor autophosphorylation was demonstrated in the presence and in the absence of detergent; the stimulatory effect of de-N-acetyl GM3 was observed only in the presence of detergent. We also demonstrate that ganglioside GM3 inhibited EGF-stimulated growth of transfected murine fibroblasts (3T3) that express the gene for human EGF receptor (Velu, T. J., Beguinot, L., Vass, W. C., Zhang, K., Pastan, I., and Lowy, D. R. (1989) J. Cell. Biochem. 39, 153-166). De-N-acetyl ganglioside GM3 had no effect on the growth of these cells. Growth of control fibroblasts, which lack endogenous EGF receptors (Pruss, R. M., and Herschman, H. R. (1977) Proc. Natl. Acad. Sci. U.S.A. 74, 3918-3921), was not affected by the presence of either ganglioside. Similarly, ganglioside GM3, but not de-N-acetyl ganglioside GM3, inhibited the EGF-dependent incorporation of [3H]thymidine into DNA by transfected fibroblasts. Incorporation of labeled thymidine into DNA of control fibroblasts was not affected by the presence of either ganglioside. These studies indicate that ganglioside GM3, but not its deacetylated analogue, can affect EGF receptor kinase activity in intact membranes.(ABSTRACT TRUNCATED AT 400 WORDS)" @default.
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• W13638220 date "1991-06-01" @default.
• W13638220 modified "2023-09-27" @default.
• W13638220 title "Effects of gangliosides GM3 and De-N-acetyl GM3 on epidermal growth factor receptor kinase activity and cell growth" @default.
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• W13638220 doi "https://doi.org/10.1016/s0021-9258(18)99206-9" @default.
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