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. 1999 Oct;90(10):1096–1103. doi: 10.1111/j.1349-7006.1999.tb00683.x

Epidermal Growth Factor‐dependent Dissociation of CrkII Proto‐oncogene Product from the Epidermal Growth Factor Receptor in Human Glioma Cells

Haruko Katayama 1, Yuko Hashimoto 1, Etsuko Kiyokawa 1, Mie Nakaya 2, Atsuhiko Sakamoto 3, Rikuo Machinami 3, Takeshi Kurata 1, Naoki Mochizuki 2, Michiyuki Matsuda 2,✉
PMCID: PMC5926002  PMID: 10595738

Abstract

Human glioma cells frequently overexpress epidermal growth factor receptor (EGFR). We found that the CrkII proto‐oncogene product was associated with the EGFR in human glioma cells in the absence of epidermal growth factor (EGF). EGF stimulation of glioma cells induced the phosphorylation of tyrosine 221 of the CrkII protein, which correlates with its dissociation from the EGFR. By contrast, Shc and Grb2 were inducibly associated with the EGFR in response to EGF stimulation of glioma cells. In A431 cells, epidermoid carcinoma cells which overexpress EGFR, CrkII was tyrosine‐phosphorylated and associated with the EGFR in an EGF‐dependent manner. Therefore, the dissociation of CrkII from the EGFR upon stimulation with EGF appears to be specific to glioma cells. The Cbl oncogene product was also tyrosine‐phosphorylated in U87MG glioma cells upon EGF stimulation. However, unlike in other cell lines, CrkII was not inducibly bound to Cbl in U87MG glioma cells. Thus, EGF‐dependent binding of CrkII to phosphotyrosine‐containing proteins appears to be suppressed in glioma cells. To evaluate the physiological role of dissociation of CrkII from EGFR, we expressed the CrkII‐23 mutant in glioma cells. CrkII‐23 mutant, which was isolated as a suppressor gene of the EGF‐dependent transformation of NRK cells, binds constitutively to EGFR. We found that expression of CrkII‐23 inhibited the anchorage‐independent growth of the glioma cells in the presence of EGF. Taken together, these data implicate EGF‐dependent dissociation of CrkII from EGFR in the oncogenicity of human glioma cells.

Keywords: Adaptor protein, Crk, Epidermal growth factor, Glioma, Tyrosine kinase

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