期刊
ONCOGENE
卷 22, 期 6, 页码 853-857出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/sj.onc.1206188
关键词
IGF-II; lung cancer; CREB; transgenic model
Elevated levels of insulin-like growth factor (IGF)-II are associated with a poor prognosis in human pulmonary adenocarcinoma; however, a causal role for IGF-II in pulmonary adenocarcinoma has not been demonstrated. Here, we show that transgenic overexpression of IGF-II in lung epithelium induces lung tumors in 69% of mice older than 18 months of age. These tumors displayed morphological characteristics of human pulmonary adenocarcinoma such as their epithelial origin, tubulo-acinar architecture and expression of TTF-1, SP-B and proSP-C. Examination of signaling molecules downstream of the IGF-IR showed the activation of either the Erk1/Erk2 or p38 MAPK pathways, but not both, within the lung tumors. Notably, all lung tumors contained high levels of phosphorylated CREB, suggesting that both the Erk1/ Erk2 and p38 MAPK pathways converged on this transcription factor. Moreover, IGF-II induced proliferation and CREB phosphorylation in human lung cancer cell lines, suggesting that IGF-II and CREB also contribute to the growth of human lung tumors. Thus, IGF-II is an important genetic factor in the development of lung tumorigenesis, in which activation of CREB is a ubiquitous event. The MMTV-IGF-II transgenic mice provide a critical model for elucidating the role of IGF-II in this fatal human disease.
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