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  • Original Paper
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cbl-b inhibits epidermal growth factor receptor signaling

Abstract

The role of cbl-b in signaling by the epidermal growth factor receptor (EGFR) was studied and compared with c-cbl. We demonstrate in vivo, that cbl-b, like c-cbl, is phosphorylated and recruited to the EGFR upon EGF stimulation and both cbl proteins can bind to the Grb2 adaptor protein. To investigate the functional role of cbl proteins in EGFR signaling, we transfected cbl-b or c-cbl into 32D cells overexpressing the EGFR (32D/EGFR). This cell line is absolutely dependent on exogenous IL-3 or EGF for sustained growth. 32D/EGFR cells overexpressing cbl-b showed markedly inhibited growth in EGF compared to c-cbl transfectants and vector controls. This growth inhibition by cbl-b was the result of a dramatic increase in the number of cells undergoing apoptosis. Consistent with this finding, cbl-b overexpression markedly decreased the amplitude and duration of AKT activation upon EGF stimulation compared to either vector controls or c-cbl overexpressing cells. In addition, the duration of EGF mediated MAP kinase and Jun kinase activation in cells overexpressing cbl-b is shortened. These data demonstrate that cbl-b inhibits EGF-induced cell growth and that cbl-b and c-cbl have distinct roles in EGF mediated signaling.

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Acknowledgements

We would like to thank Silvio Gutkind for his advice, discussion and critical review of this manuscript. We would also like to thank Nelson Ellmore and Veena Kapoor for assistance with cell culture and flow cytometry.

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Ettenberg, S., Keane, M., Nau, M. et al. cbl-b inhibits epidermal growth factor receptor signaling. Oncogene 18, 1855–1866 (1999). https://doi.org/10.1038/sj.onc.1202499

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