Abstract

CNC proteins consist of Bach1, Bach2 and 4 homologous transcription factors: Nrf1, Nrf2, Nrf3 and p45NF-E2. Transcription factors belonging to this group of proteins play a crucial role in protection of cells against oxidative stress. Under physiological conditions, they remain in the cytoplasm in the inactive form or are degraded. However, in oxidative stress conditions, they are translocated to the nucleus, and bind to DNA in the ARE sequence. Consequently, there is transcription of genes encoding cytoprotective proteins, such as phase II enzymes, or low molecular weight antioxidant proteins (i.e., thioredoxin, ferritin, metallothionein) responsible for protecting cells from reactive oxygen species (ROS) action. The activity of transcriptional proteins depends directly on the redox state of the cell. ROS as second messenger signals, control inhibitors of cytoplasmic CNC proteins or potentiate the activity of kinases (MAPK, PKC, PI3K, PERK), leading to phosphorylation of transcription factors. This is conducive to translocation of these molecules into the nucleus and to formation of complexes that initiate the gene expression. Disorders of regulation of the activity of transcription factors belonging to the CNC proteins caused by gene mutations, epigenetic modifications or increased activity of p62, p21, or k-Ras, B-Raf and c-Myc oncogenes, induce changes in the level of ARE-dependent gene expression, which can lead even to the development of carcinogenesis. On the other hand, Nrf transcription factors, inducing the expression of antioxidants and enzymes responsible for the detoxification of xenobiotics, can be considered as a potential target of the action of chemopreventive factors in anticancer therapy.

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