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- Title
A new tumor suppressor role for the Notch pathway in bladder cancer.
- Authors
Rampias, Theodoros; Vgenopoulou, Paraskevi; Avgeris, Margaritis; Polyzos, Alexander; Stravodimos, Konstantinos; Valavanis, Christos; Scorilas, Andreas; Klinakis, Apostolos
- Abstract
The Notch signaling pathway controls cell fates through interactions between neighboring cells by positively or negatively affecting the processes of proliferation, differentiation and apoptosis in a context-dependent manner. This pathway has been implicated in human cancer as both an oncogene and a tumor suppressor. Here we report new inactivating mutations in Notch pathway components in over 40% of human bladder cancers examined. Bladder cancer is the fourth most commonly diagnosed malignancy in the male population of the United States. Thus far, driver mutations in fibroblast growth factor receptor 3 (FGFR3) and, less commonly, in RAS proteins have been identified. We show that Notch activation in bladder cancer cells suppresses proliferation both in vitro and in vivo by directly upregulating dual-specificity phosphatases (DUSPs), thus reducing the phosphorylation of ERK1 and ERK2 (ERK1/2). In mouse models, genetic inactivation of Notch signaling leads to Erk1/2 phosphorylation, resulting in tumorigenesis in the urinary tract. Collectively our findings show that loss of Notch activity is a driving event in urothelial cancer.
- Subjects
TUMOR suppressor proteins; BLADDER cancer; CELL proliferation; CELL differentiation; FIBROBLAST growth factor receptors; PHOSPHORYLATION; NEOPLASTIC cell transformation
- Publication
Nature Medicine, 2014, Vol 20, Issue 10, p1199
- ISSN
1078-8956
- Publication type
Article
- DOI
10.1038/nm.3678