Oncogenic KRas suppresses inflammation-associated senescence of pancreatic ductal cells.

Oncogenic KRas suppresses inflammation-associated senescence of pancreatic ductal cells.
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DOI:
10.1016/j.ccr.2010.10.020
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发表时间:
2010-11-16
期刊:
影响因子:
50.3
通讯作者:
Bar-Sagi D
Bar-Sagi D
中科院分区:
医学1区
文献类型:
--
作者:
Lee KE;Bar-Sagi D

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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 which in turn abrogates p16INK4A induction. Moreover, the KRas - Twist - p16INK4A 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.
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