Nrf1 Is Endowed with a Dominant Tumor-Repressing Effect onto the Wntβ-Catenin-Dependent and Wntβ-Catenin-Independent Signaling Networks in the Human Liver Cancer
Joint Authors
Zhang, Y.
Xiang, Yuancai
Chen, Jiayu
Wang, Meng
Ru, Xufang
Ren, Yonggang
Liu, Xiping
Qiu, Lu
Source
Oxidative Medicine and Cellular Longevity
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-28, 28 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-03-23
Country of Publication
Egypt
No. of Pages
28
Main Subjects
Abstract EN
Our previous work revealed that Nrf1α exerts a tumor-repressing effect because its genomic loss (to yield Nrf1α-/-) results in oncogenic activation of Nrf2 and target genes.
Interestingly, β-catenin is concurrently activated by loss of Nrf1α in a way similar to β-catenin-driven liver tumor.
However, a presumable relationship between Nrf1 and β-catenin is not yet established.
Here, we demonstrate that Nrf1 enhanced ubiquitination of β-catenin for targeting proteasomal degradation.
Conversely, knockdown of Nrf1 by its short hairpin RNA (shNrf1) caused accumulation of β-catenin so as to translocate the nucleus, allowing activation of a subset of Wnt/β-catenin signaling responsive genes, which leads to the epithelial-mesenchymal transition (EMT) and related cellular processes.
Such silencing of Nrf1 resulted in malgrowth of human hepatocellular carcinoma, along with malignant invasion and metastasis to the lung and liver in xenograft model mice.
Further transcriptomic sequencing unraveled significant differences in the expression of both Wnt/β-catenin-dependent and Wnt/β-catenin-independent responsive genes implicated in the cell process, shape, and behavior of the shNrf1-expressing tumor.
Notably, we identified that β-catenin is not a target gene of Nrf1, but this CNC-bZIP factor contributes to differential or opposing expression of other critical genes, such as CDH1, Wnt5A, Wnt11A, FZD10, LEF1, TCF4, SMAD4, MMP9, PTEN, PI3K, JUN, and p53, each of which depends on the positioning of distinct cis-regulatory sequences (e.g., ARE and/or AP-1 binding sites) in the gene promoter contexts.
In addition, altered expression profiles of some Wnt/β-catenin signaling proteins were context dependent, as accompanied by decreased abundances of Nrf1 in the clinic human hepatomas with distinct differentiation.
Together, these results corroborate the rationale that Nrf1 acts as a bona fide dominant tumor repressor, by its intrinsic inhibition of Wnt/β-catenin signaling and relevant independent networks in cancer development and malignant progression.
American Psychological Association (APA)
Chen, Jiayu& Wang, Meng& Xiang, Yuancai& Ru, Xufang& Ren, Yonggang& Liu, Xiping…[et al.]. 2020. Nrf1 Is Endowed with a Dominant Tumor-Repressing Effect onto the Wntβ-Catenin-Dependent and Wntβ-Catenin-Independent Signaling Networks in the Human Liver Cancer. Oxidative Medicine and Cellular Longevity،Vol. 2020, no. 2020, pp.1-28.
https://search.emarefa.net/detail/BIM-1204739
Modern Language Association (MLA)
Chen, Jiayu…[et al.]. Nrf1 Is Endowed with a Dominant Tumor-Repressing Effect onto the Wntβ-Catenin-Dependent and Wntβ-Catenin-Independent Signaling Networks in the Human Liver Cancer. Oxidative Medicine and Cellular Longevity No. 2020 (2020), pp.1-28.
https://search.emarefa.net/detail/BIM-1204739
American Medical Association (AMA)
Chen, Jiayu& Wang, Meng& Xiang, Yuancai& Ru, Xufang& Ren, Yonggang& Liu, Xiping…[et al.]. Nrf1 Is Endowed with a Dominant Tumor-Repressing Effect onto the Wntβ-Catenin-Dependent and Wntβ-Catenin-Independent Signaling Networks in the Human Liver Cancer. Oxidative Medicine and Cellular Longevity. 2020. Vol. 2020, no. 2020, pp.1-28.
https://search.emarefa.net/detail/BIM-1204739
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1204739