Abstract:
:Transcription factor Nrf2 (NF-E2-related factor 2) is essential for oxidative and electrophilic stress responses. While it has been well characterized that Nrf2 activity is tightly regulated at the protein level through proteasomal degradation via Keap1 (Kelch-like ECH-associated protein 1)-mediated ubiquitination, not much attention has been paid to the supply side of Nrf2, especially regulation of Nrf2 gene transcription. Here we report that manipulation of Nrf2 transcription is effective in changing the final Nrf2 protein level and activity of cellular defense against oxidative stress even in the presence of Keap1 and under efficient Nrf2 degradation, determined using genetically engineered mouse models. In excellent agreement with this finding, we found that minor A/A homozygotes of a single nucleotide polymorphism (SNP) in the human NRF2 upstream promoter region (rs6721961) exhibited significantly diminished NRF2 gene expression and, consequently, an increased risk of lung cancer, especially those who had ever smoked. Our results support the notion that in addition to control over proteasomal degradation and derepression from degradation/repression, the transcriptional level of the Nrf2 gene acts as another important regulatory point to define cellular Nrf2 levels. These results thus verify the critical importance of human SNPs that influence the levels of transcription of the NRF2 gene for future personalized medicine.
journal_name
Mol Cell Bioljournal_title
Molecular and cellular biologyauthors
Suzuki T,Shibata T,Takaya K,Shiraishi K,Kohno T,Kunitoh H,Tsuta K,Furuta K,Goto K,Hosoda F,Sakamoto H,Motohashi H,Yamamoto Mdoi
10.1128/MCB.00065-13subject
Has Abstractpub_date
2013-06-01 00:00:00pages
2402-12issue
12eissn
0270-7306issn
1098-5549pii
MCB.00065-13journal_volume
33pub_type
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