中国仓鼠卵巢细胞
表皮生长因子受体
表皮生长因子
磷酸化
生物
分子生物学
受体
酪氨酸磷酸化
细胞培养
转染
跨膜蛋白
癌基因
癌症研究
细胞表面受体
配体(生物化学)
细胞生物学
细胞
细胞周期
生物化学
遗传学
作者
Ruth Lupu,Rámón Colomer,Gerhard Zugmaier,Jay Sarup,Michael Shepard,Dennis J. Slamon,Marc E. Lippman
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:1990-09-28
卷期号:249 (4976): 1552-1555
被引量:279
标识
DOI:10.1126/science.2218496
摘要
The erb B2 oncogene encodes a 185-kilodalton transmembrane protein whose sequence is similar to the epidermal growth factor receptor (EGFR). A 30-kilodalton factor (gp30) secreted from MDA-MB-231 human breast cancer cells was shown to be a ligand for p185 erb B2 . An antibody to EGFR abolished the tyrosine phosphorylation induced by EGF and transforming growth factor-α (TGF-α) but only partially blocked that produced by gp30 in SK-BR-3 breast cancer cells. In two cell lines that overexpress erb B2 but do not express EGFR (MDA-MB-453 breast cancer cells and a Chinese hamster ovary cell line that had been transfected with erb B2), phosphorylation of p185 erb B2 was induced only by gp30. The gp30 specifically inhibited the growth of cells that overexpressed p185 erb B2 . An antibody to EGFR had no effect on the inhibition of SK-BR-3 cell colony formation obtained with gp30. Thus, it appeared that gp30 interacted directly with the EGFR and erb B2. Direct binding of gp30 to p185 erb B2 was confirmed by binding competition experiments, where gp30 was found to displace the p185 erb B2 binding of a specific antibody to p185 erb B2 . The evidence described here suggests that gp30 is a ligand for p185 erb B2 .
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