Nuclear factor-erythroid 2-related factor 1 regulates expression of proteasome genes in hepatocytes and protects against endoplasmic reticulum stress and steatosis in mice.

Nuclear factor-erythroid 2-related factor 1 regulates expression of proteasome genes in hepatocytes and protects against endoplasmic reticulum stress and steatosis in mice.
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核因子 - 果皮2相关因子1调节肝细胞中蛋白酶体基因的表达,并预防小鼠内质网应激和脂肪变性。

DOI:
10.1111/febs.12350
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发表时间:
2013-08
期刊:
The FEBS journal
影响因子:
--
通讯作者:
Chan JY
Chan JY
中科院分区:
其他
文献类型:
--
作者:
Lee CS;Ho DV;Chan JY

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泛素蛋白酶体系统(UPS)在维持蛋白质稳态中起重要作用。NFE 2相关因子1(Nrf1)是帽“n”领(CNC)碱性亮氨酸拉链家族中的转录因子,调节细胞保护基因的表达。以前的研究表明,肝脏特异性敲除Nrf1(Nrf1LKO)可导致肝细胞死亡、脂肪性肝炎和癌症。然而,这些病理的机制尚不清楚。在这里,我们报告说,Nrf1是关键的蛋白酶体基因在肝脏中的表达。肝脏特异性敲除Nrf1导致蛋白酶体基因的基础和诱导表达受损,以及肝细胞中蛋白酶体活性降低。此外,我们的研究结果表明,ER应激信号通路也在Nrf1LKO肝脏中被激活。蛋白酶体活性的抑制导致Nrf1缺陷肝细胞中的ER应激,促进肝脏脂肪变性的发展。我们的研究结果表明,Nrf1在维持肝细胞蛋白酶体功能和预防肝脂肪变性发展中起着不可或缺的作用。此外,这些结果突出了蛋白酶体功能障碍、ER应激和脂肪变性之间的关联。
The ubiquitin proteasome system (UPS) is important in maintaining protein homeostasis. NFE2-related factor 1 (Nrf1), a transcription factor in the cap “n” collar (CNC) basic leucine zipper family, regulates expression of cytoprotective genes. It was previously shown that liver-specific knockout of Nrf1 (Nrf1LKO) leads to hepatic cell death, steatohepatitis and cancer. However, the mechanisms underlying these pathologies are not clear. Here, we report that Nrf1 is critical for proteasome gene expression in the liver. Liver-specific knockout of Nrf1 results in impaired basal and induced expression of proteasome genes, and diminished proteasome activity in hepatocytes. In addition, our findings demonstrated that ER stress signaling pathway was also activated in Nrf1LKO livers. Inhibition of proteasome activity leads to ER stress in Nrf1-deficient hepatocytes, prompting the development of steatosis in the liver. Our results indicate that Nrf1 plays an integral role in the maintenance of proteasome function in hepatocytes and in the prevention of liver steatosis development. Moreover, these results highlight an association between proteasome dysfunction, ER stress and steatosis.
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