Abstract:
:Mutational activation of KRas is the first and most frequently detected genetic lesion in pancreatic ductal adenocarcinoma (PDAC). However, the precise role of oncogenic KRas in the pathogenesis of PDAC is not fully understood. Here, we report that the endogenous expression of oncogenic KRas suppresses premature senescence in primary pancreatic duct epithelial cells (PDEC). Oncogenic KRas-mediated senescence bypass is conferred by the upregulation of the basic helix-loop-helix transcription factor Twist that in turn abrogates p16(INK4A) induction. Moreover, the KRas-Twist-p16(INK4A) senescence bypass pathway is employed in vivo to prevent inflammation-associated senescence of pancreatic ductal epithelium. Our findings indicate that oncogenic KRas could contribute to PDAC initiation by protecting cells from entering a state of permanent growth arrest.
journal_name
Cancer Celljournal_title
Cancer cellauthors
Lee KE,Bar-Sagi Ddoi
10.1016/j.ccr.2010.10.020subject
Has Abstractpub_date
2010-11-16 00:00:00pages
448-58issue
5eissn
1535-6108issn
1878-3686pii
S1535-6108(10)00422-8journal_volume
18pub_type
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