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Csk-binding protein (Cbp) negatively regulates epidermal growth factor-induced cell transformation by controlling Src activation

Abstract

Epidermal growth factor receptor (EGFR) and Src tyrosine kinase cooperate in regulating EGFR-mediated cell signaling and promoting cell transformation and tumorigenesis in pathological conditions. Activation of Src is tightly regulated by the C-terminal Src kinase (Csk). The Csk-binding protein (Cbp) is a ubiquitously expressed transmembrane protein. Its functions include suppression of T-cell receptor activation through recruiting Csk and inhibiting Src family kinase (SFK). However, a potential role of Cbp in EGF-induced cell activities has not been investigated. Here, we report that EGF-stimulation-induced Cbp tyrosine phosphorylation followed by Cbp–Csk association, in a SFK-dependent manner. Expression of wild-type (wt) Cbp remarkably suppressed EGF-induced activation of Src, ERK1/2, and Akt-1 enzymes, and NIH3T3 cell transformation, as well as colony formation of a breast cancer cell line (MDA-MB-468) in soft agar. In contrast, expression of CbpY317F or knockdown endogenous Cbp in NIH3T3 cells by RNA interference significantly enhanced EGF-induced activation of these enzymes and cell transformation. In addition, overexpression of multiple receptor tyrosine kinases (RTKs)-induced Cbp tyrosine phosphorylation. These results demonstrate that Cbp functions as a negative regulator of cell transformation and tumor cell growth through downregulation of Src activation, suggesting that Cbp might be broadly involved in RTKs-activated signaling pathways and tumorigenesis.

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Acknowledgements

We thank Dr Axel Ullrich for providing the plasmids and cell lines as mentioned in Materials and methods. This work was supported by the grants from National Natural Science Foundation of China (No. 30270335) and from the Ministry of Science and Technology, China (No. 2001AA233031 and No. 2001CB510205) and also from Shanghai-Anson Research Foundation (SHARF).

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Correspondence to Z Chen.

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Jiang, L., Feng, X., Zhou, W. et al. Csk-binding protein (Cbp) negatively regulates epidermal growth factor-induced cell transformation by controlling Src activation. Oncogene 25, 5495–5506 (2006). https://doi.org/10.1038/sj.onc.1209554

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