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
Wan, Yong
中科院分区:
生物学1区
文献类型:
--
作者:
Gamper, Armin M.;Qiao, Xinxian;Kim, Jennifer;Zhang, Liyong;DeSimone, Michelle C.;Rathmell, W. Kimryn;Wan, Yong

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Krüppel样转录因子4(KLF 4)是细胞命运决定的重要调节因子,包括细胞周期调节、细胞凋亡和干细胞更新,并且作为组织特异性肿瘤抑制因子或癌基因在肿瘤发生中起着矛盾的作用。在这里,我们报告说,冯希佩尔-林道基因产物,pVHL,物理相互作用与KLF 4和调节其快速营业额中观察到的分化和干细胞。我们提供了KLF 4降解机制的见解,并表明大肠癌细胞中的pVHL耗竭导致细胞周期停滞,伴随着KLF 4依赖性p21基因转录的增加。最后,免疫组化染色显示结肠癌组织中pVHL升高,KLF 4水平降低。因此,我们提出,出乎意料的pVHL,通过降解KLF 4,是一个促进因素,在结直肠肿瘤的发生。
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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