Journal
CANCER RESEARCH
Volume 71, Issue 20, Pages 6475-6484Publisher
AMER ASSOC CANCER RESEARCH
DOI: 10.1158/0008-5472.CAN-11-1702
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Funding
- NIH NIDDK [R01 DK080031, DK080031-02S1]
- University of Pennsylvania Center for Molecular Studies in Digestive and Liver Diseases (NIH NIDDK) [P30 DK050306]
- NIH NCI [P01 CA098101]
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Squamous cell cancers account for more than half of all human cancers, and esophageal cancer is the sixth leading cause of cancer death worldwide. The majority of esophageal squamous cell carcinomas have identifiable p53 mutations, yet the same p53 mutations are found at comparable frequencies in precancerous dysplasia, indicating that transformation requires additional somatic changes yet to be defined. Here, we show that the zinc finger transcription factor Kruppel-like factor 5 (KLF5) transactivates NOTCH1 in the context of p53 mutation or loss. KLF5 loss limited NOTCH1 activity and was sufficient on its own to transform primary human keratinocytes harboring mutant p53, leading to the formation of invasive tumors. Restoration of NOTCH1 blocked transformation of KLF5-deficient and p53-mutant keratinocytes. Although human dysplastic epithelia accumulated KLF5, KLF5 expression was lost concurrently with NOTCH1 in squamous cell cancers. Taken together, these results define KLF5 loss as a critical event in squamous cell transformation and invasion. Our findings suggest that KLF5 may be a useful diagnostic and therapeutic target in esophageal squamous carcinomas and possibly more generally in other cancers associated with p53 loss of function. Cancer Res; 71(20); 6475-84. (C) 2011 AACR.
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