A microRNA miR-34a-regulated bimodal switch targets Notch in colon cancer stem cells.
A microRNA miR-34a-regulated bimodal switch targets Notch in colon cancer stem cells.
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DOI:
10.1016/j.stem.2013.03.002
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发表时间:
2013-05-02
期刊:
影响因子:
23.9
通讯作者:
Shen, Xiling
中科院分区:
文献类型:
--
作者:
Bu, Pengcheng;Chen, Kai-Yuan;Chen, Joyce Huan;Wang, Lihua;Walters, Jewell;Shin, Yong Jun;Goerger, Julian P.;Sun, Jian;Witherspoon, Mavee;Rakhilin, Nikolai;Li, Jiahe;Yang, Herman;Milsom, Jeff;Lee, Sang;Zipfel, Warren;Jin, Moonsoo M.;Guemues, Zeynep H.;Lipkin, Steven M.;Shen, Xiling
microRNAs regulate developmental cell fate decisions, tissue homeostasis and oncogenesis in distinct ways relative to proteins. Here, we show that the tumor suppressor microRNA miR-34a is a cell fate determinant in early stage dividing colon cancer stem cells (CCSCs). In pair-cell assays, miR34a distributes at high levels in differentiating progeny, while low levels of miR34a demarcate self renewing CCSCs. Moreover, miR34a loss of function and gain of function alters the balance between self-renewal and differentiation both in vitro and in vivo. Mechanistically, miR34a sequesters Notch1 mRNA to generate a sharp threshold response where a bimodal Notch signal specifies the choice between self-renewal versus differentiation. In contrast, the canonical cell fate determinant Numb regulates Notch levels in a continuously graded manner. Taken together, our findings highlight a unique microRNA regulated mechanism that converts noisy input into a toggle switch for robust cell fate decisions in CCSCs.
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