Redox regulation by Keap1 and Nrf2 controls intestinal stem cell proliferation in Drosophila.

Redox regulation by Keap1 and Nrf2 controls intestinal stem cell proliferation in Drosophila.
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DOI:
10.1016/j.stem.2010.12.006
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发表时间:
2011-02-04
期刊:
影响因子:
23.9
通讯作者:
Jasper H
Jasper H
中科院分区:
医学1区
文献类型:
--
作者:
Hochmuth CE;Biteau B;Bohmann D;Jasper H

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在果蝇中,肠道干细胞(ISCs)通过增加增殖率来应对氧化挑战和炎症。这种表型是再生反应的一部分,但可导致衰老动物的过度增殖和上皮变性。在这里,我们表明,Nrf2,细胞氧化还原状态的主调节器,专门控制ISCs的增殖活性,促进肠道内稳态。我们发现,Nrf2是组成性活跃的ISCs,和Nrf2的负调控因子Keap1的抑制是必需的ISC增殖。我们进一步表明,Nrf2和Keap1发挥这一功能,通过调节细胞内的氧化还原平衡在ISCs。因此,ISCs中Nrf2的缺失导致活性氧簇的积累并加速肠上皮的年龄相关性变性。我们的研究结果将Keap1和Nrf2确定为调节高周转组织中干细胞功能的关键氧化还原管理系统。
In Drosophila, intestinal stem cells (ISCs) respond to oxidative challenges and inflammation by increasing proliferation rates. This phenotype is part of a regenerative response, but can lead to hyperproliferation and epithelial degeneration in the aging animal. Here we show that Nrf2, a master regulator of the cellular redox state, specifically controls the proliferative activity of ISCs, promoting intestinal homeostasis. We find that Nrf2 is constitutively active in ISCs, and that repression of Nrf2 by its negative regulator Keap1 is required for ISC proliferation. We further show that Nrf2 and Keap1 exert this function in ISCs by regulating the intracellular redox balance. Accordingly, loss of Nrf2 in ISCs causes accumulation of reactive oxygen species and accelerates age-related degeneration of the intestinal epithelium. Our findings establish Keap1 and Nrf2 as a critical redox management system that regulates stem cell function in high-turnover tissues.
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