Deficiency in the nuclear-related factor erythroid 2 transcription factor (Nrf1) leads to genetic instability.

Deficiency in the nuclear-related factor erythroid 2 transcription factor (Nrf1) leads to genetic instability.
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DOI:
10.1111/febs.12005
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发表时间:
2012-11
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:
Oh DH;Rigas D;Cho A;Chan JY

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核因子红细胞衍生 2 相关因子 1 (Nrf1) 调节细胞应激反应基因,并且还被认为在其他细胞过程中发挥作用。我们之前证明,小鼠肝细胞特异性缺失 Nrf1 会导致自发性细胞凋亡、炎症和肝肿瘤的发展。在这里,我们发现源自 Nrf1 缺失的小鼠胚胎的成纤维细胞和带有条件 Nrf1 等位基因的成纤维细胞均表现出微核增加和异常细胞核的形成。慢病毒 shRNA 介导的 SAOS-2 细胞中 Nrf1 的敲低也导致微核增加、有丝分裂异常和多核细胞。中期分析显示 Nrf1-/- 胚胎成纤维细胞的非整倍性增加。 Nrf1缺陷细胞中的核缺陷与编码动粒和有丝分裂检查点蛋白的各种基因的表达减少有关。我们的研究结果表明,Nrf1 可能具有维持基因组完整性的功能,并且 Nrf1 失调可诱导肿瘤发生。
Nuclear factor erythroid-derived 2-related factor 1 (Nrf1) regulates cellular stress response genes, and has also been implicated to have a role in other cellular processes. We previously demonstrated that hepatocyte-specific deletion of Nrf1 in mice resulted in spontaneous apoptosis, inflammation, and development of liver tumors. Here, we showed that both fibroblasts derived from Nrf1-null mouse embryos, and fibroblasts bearing a conditional Nrf1 allele exhibited increased micronuclei and formation of abnormal nuclei. Lentiviral shRNA-mediated knockdown of Nrf1 in SAOS-2 cells also resulted in increased micronuclei, abnormal mitosis and multinucleated cells. Metaphase analyses showed increased aneuploidy in Nrf1-/- embryonic fibroblasts. Nuclear defects in Nrf1-deficient cells were associated with decreased expression of various genes encoding kinetochore and mitotic checkpoint proteins. Our findings suggest that Nrf1 may serve a function in maintaining genomic integrity, and Nrf1 dysregulation can induce tumorigenesis.
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