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Ras stabilization through aberrant activation of Wnt/β-catenin signaling promotes intestinal tumorigenesis.

Authors
 Saluja Kaduwal ; Hoguen Kim ; and Kang-Yell Choi ; Jong-Bok Yoon 
Citation
 Science Signaling, Vol.5(219) : ra30, 2012 
Journal Title
 Science Signaling 
ISSN
 1937-9145 
Issue Date
2012
Abstract
Although the guanosine triphosphate/guanosine diphosphate loading switch is a major regulatory mechanism that controls the activity of the guanosine triphosphatase Ras, we report a distinct mechanism for regulating Ras activity through phosphorylation-mediated degradation and describe the role of this second regulatory mechanism in the suppression of cellular transformation and tumors induced by Ras mutations. We found that negative regulators of Wnt/β-catenin signaling contributed to the polyubiquitin-dependent degradation of Ras after its phosphorylation by glycogen synthase kinase 3β (GSK3β) and the subsequent recruitment of β-TrCP-E3 ligase. We found a positive association between tumorigenesis and Ras stabilization resulting from the aberrant activation of Wnt/β-catenin signaling in adenomas from two mouse models of colon cancer, human colonic tumors from various stages, and colon polyps of patients with familial adenomatous polyposis. Our results indicated that GSK3β plays an essential role in Ras degradation and that inhibition of this degradation pathway by aberrant Wnt/β-catenin signaling may contribute to Ras-induced transformation in colorectal tumorigenesis
URI
http://ir.ymlib.yonsei.ac.kr/handle/22282913/91840
DOI
10.1126/scisignal.2002242
Appears in Collections:
1. 연구논문 > 1. College of Medicine > Dept. of Pathology
Yonsei Authors
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Link
 http://stke.sciencemag.org/content/5/219/ra30.long
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