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Advances in Brief |
1 Cancer Therapeutics Branch,
2 Cell and Cancer Biology Branch, and
3 Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, NIH, Bethesda, Maryland, and
4 Lovelace Respiratory Research Institute, Albuquerque, New Mexico
The role of the phosphatidylinositol 3'-kinase (PI3K)/Akt pathway during tobacco carcinogen-induced transformation is unknown. To address this question, we evaluated this pathway in isogenic immortalized or tumorigenic human bronchial epithelial cells in vitro, as well as in progressive murine lung lesions induced by a tobacco-specific carcinogen, 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone. Compared with immortalized cells, tumorigenic cells had greater activation of the PI3K/Akt pathway, enhanced survival, and increased apoptosis in response to inhibition of the pathway. In vivo, increased activation of Akt and mammalian target of rapamycin was observed with increased phenotypic progression. Collectively, these results support the hypothesis that maintenance of Akt activity is necessary for survival of preneoplastic as well as transformed lung epithelial cells and suggest that inhibition of the PI3K/Akt pathway might be a useful approach to arrest lung tumorigenesis.
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