The FOXO transcription factor DAF-16 bypasses ire-1 requirement to promote endoplasmic reticulum homeostasis.

The FOXO transcription factor DAF-16 bypasses ire-1 requirement to promote endoplasmic reticulum homeostasis.
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FOXO转录因子DAF-16绕过ire-1促进内质网稳态

DOI:
10.1016/j.cmet.2014.09.006
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发表时间:
2014
期刊:
影响因子:
29
通讯作者:
S. Henis- Korenblit
S. Henis- Korenblit
中科院分区:
生物学1区
文献类型:
--
作者:
M. Safra;R. Fickentscher;M. Levi-Ferber;Y.M. Danino;A. Haviv- Chesner;M. Hansen;T. Juven-Gershon;M. Weiss ;S. Henis- Korenblit

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未折叠蛋白反应(UPR)允许细胞调整内质网(ER)的容量以适应ER相关任务的负载。我们发现,当UPR功能失调时,秀丽隐杆线虫转录因子DAF-16及其人类同源物FOXO3的激活可以恢复分泌蛋白代谢。我们发现DAF-16建立了替代的内质网相关降解系统,可以独立于内质网应激感受器-1和内质网相关E3泛素连接酶复合物self -11/ self -1降解错误折叠的蛋白质。这是通过激活自噬介导的降解和增加skr-5的水平来实现的,skr-5是er相关泛素连接酶复合物的组成部分。这些降解系统可以与保守的UPR一起作用,以改善内质网稳态和内质网抗逆性,超过野生型水平。由于内质网中没有激活DAF-16以响应内质网应激的传感器,激活DAF-16的自然或人工干预可能是维持内质网稳态的有效治疗方法。
The unfolded protein response (UPR) allows cells to adjust the capacity of the endoplasmic reticulum (ER) to the load of ER-associated tasks. We show that activation of theCaenorhabditis eleganstranscription factor DAF-16 and its human homolog FOXO3 restore secretory protein metabolism when the UPR is dysfunctional. We show that DAF-16 establishes alternative ER-associated degradation systems that degrade misfolded proteins independently of the ER stress sensorire-1and the ER-associated E3 ubiquitin ligase complexsel-11/sel-1. This is achieved by enabling autophagy-mediated degradation and by increasing the levels ofskr-5, a component of an ER-associated ubiquitin ligase complex. These degradation systems can act together with the conserved UPR to improve ER homeostasis and ER stress resistance, beyond wild-type levels. Because there is no sensor in the ER that activates DAF-16 in response to intrinsic ER stress, natural or artificial interventions that activate DAF-16 may be useful therapeutic approaches to maintain ER homeostasis.
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Hosokawa N、Wada I、Hasekawa K、Yorihuzi T、Tremblay L O、Herscovics A、Nagata K.:“一种新型 ER α-甘露糖苷酶样蛋白加速 ER 相关降解”EMBO 报告。
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