Regulation of KLF4 turnover reveals an unexpected tissue-specific role of pVHL in tumorigenesis.
Regulation of KLF4 turnover reveals an unexpected tissue-specific role of pVHL in tumorigenesis.
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DOI:
10.1016/j.molcel.2011.11.031
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发表时间:
2012-01-27
期刊:
影响因子:
16
通讯作者:
Wan, Yong
中科院分区:
文献类型:
--
作者:
Gamper, Armin M.;Qiao, Xinxian;Kim, Jennifer;Zhang, Liyong;DeSimone, Michelle C.;Rathmell, W. Kimryn;Wan, Yong
The transcription factor Krüppel-like factor 4 (KLF4) is an important regulator of cell fate decision, including cell cycle regulation, apoptosis, and stem cell renewal, and plays an ambivalent role in tumorigenesis as a tissue specific tumor suppressor or oncogene. Here we report that the Von Hippel-Lindau gene product, pVHL, physically interacts with KLF4 and regulates its rapid turnover observed in both differentiated and stem cells. We provide mechanistic insights into KLF4 degradation and show that pVHL depletion in colorectal cancer cells leads to cell cycle arrest concomitant with increased transcription of the KLF4-dependent p21 gene. Finally, immunohistochemical staining revealed elevated pVHL and reduced KLF4 levels in colon cancer tissues. We therefore propose that unexpectedly pVHL, via the degradation of KLF4, is a facilitating factor in colorectal tumorigenesis.
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