期刊
JOURNAL OF CELL BIOLOGY
卷 153, 期 5, 页码 1023-1033出版社
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.153.5.1023
关键词
Met; receptor tyrosine kinase signaling; tumorigenesis; transgenic mouse; cell adhesion
类别
资金
- NCI NIH HHS [CA44338] Funding Source: Medline
- NIDDK NIH HHS [P30 DK026743, 5P30 DK26743] Funding Source: Medline
Overexpression is the most common abnormality of receptor tyrosine kinases (RTKs) in human tumors It is presumed that overexpression leads to constitutive activation of RTKs, but the mechanism of that activation has been uncertain. Here we show that overexpression of the Met RTK allows activation of the receptor by cell attachment and that this form of activation can be tumorigenic. Transgenic mice that overexpressed Met in hepatocytes developed hepatocellular carcinoma (HCC), one of the human tumors in which Met has been implicated previously. The tumorigenic Met was activated by cell attachment rather than by ligand. Inactivation of the transgene led to regression of even highly advanced tumors, apparently mediated by apoptosis and cessation of cellular proliferation. These results reveal a previously unappreciated mechanism by which the tumorigenic action of RTKs can be mediated, provide evidence that Met may play a role in both the genesis and maintenance of HCC, and suggest that Met may be a beneficial therapeutic target in tumors that overexpress the receptor.
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