Antioxidant response element (ARE) (ARE)

The Antioxidant Response Element (ARE) is a critical cis-acting regulatory DNA sequence, typically characterized by the consensus motif 5'-TGACnnnGC-3', located in the promoter regions of genes encoding phase II detoxification enzymes and antioxidant proteins [Nguyen et al., 2009, J Biol Chem]. It serves as the primary genomic binding site for the transcription factor Nuclear factor erythroid 2-related factor 2 (Nrf2), which acts as the master regulator of the cellular adaptive response to oxidative and electrophilic stress [Ma, 2013, Annu Rev Pharmacol Toxicol]. Under normal physiological conditions, Nrf2 is sequestered in the cytoplasm by Keap1 and targeted for proteasomal degradation; however, oxidative stress or pharmacological intervention triggers Nrf2 translocation to the nucleus, where it binds to the ARE to initiate the transcription of cytoprotective genes such as NQO1, HO-1, and GCLC [Tonelli et al., 2018, Antioxid Redox Signal]. This pathway is a major therapeutic target for conditions involving oxidative damage and inflammation, leading to the development of drugs like dimethyl fumarate for multiple sclerosis and omaveloxolone for Friedreich's ataxia [FDA, 2023, Skyclarys Label]. While activating the ARE pathway provides neuroprotection and reduces inflammation, its chronic overactivation in established tumors can promote cancer cell survival and resistance to therapy, a phenomenon known as the "Nrf2 paradox" [Jaramillo & Zhang, 2013, Genes Dev]. Consequently, therapeutic strategies must balance the benefits of cytoprotection with the risks of promoting malignancy in susceptible populations.

Other names

Electrophile response elementEpRENrf2-binding site

Induction of gene expression through the recruitment of Nrf2-Maf heterodimers to the ARE sequence in response to oxidative stress or pharmacological activators.