NQO1 is one of the two major quinone reductases in mammalian systems. Established roles of NQO1 include its ability to prevent certain quinones from one electron redox cycling but its role in quinone detoxification is dependent on the redox stability of the hydroquinone generated by two-electron reduction.
What is the NRF2 gene?
NF-E2–related factor 2 (Nrf2) is an essential transcription factor that regulates an array of detoxifying and antioxidant defense gene expression in the liver. It is activated in response to oxidative stress and induces the expression of its target genes by binding to the antioxidant response element (ARE).
What is quinone oxidoreductase?
NAD(P)H:quinone oxidoreductase 1 (NQO1) is a two-electron reductase responsible for detoxification of quinones and also bioactivation of certain quinones.
What is NQO1 enzyme?
NQO1 is a xenobiotic metabolizing cytosolic enzyme that catalyzes the reduction of two- or four-electron of numerous exogenous and endogenous quinones by utilizing flavin adenine dinucleotide (FAD) as a cofactor.
What chromosome is Nrf2 on?
Human Nrf2 is located on human chromosome 2, harbors 5 exons, and the transcript (variant 1, 2856 bp) encodes a protein containing 605 amino acid residues. Nrf2 protein consists of 6 highly conserved Neh domains.
What induces Nrf2?
Under stress (electrophiles or ROS or endoplasmic reticulum (ER) stress) conditions, Nrf2 is released from Keap1-Cul3-RBX1 complex and translocates into the nucleus wherein it heterodimerizes with small Maf proteins (sMaf) and binds to the antioxidant response elements (AREs), leading to the transcription of ARE-driven …
What is quinone in chemistry?
The quinones are a class of organic compounds that are formally “derived from aromatic compounds [such as benzene or naphthalene] by conversion of an even number of –CH= groups into –C(=O)– groups with any necessary rearrangement of double bonds, resulting in “a fully conjugated cyclic dione structure”. …
Is quinone an enzyme?
2 Na+-Translocating NADH:Quinone Oxidoreductase (Na+-NQR) Na+-NQR is an enzyme effecting the respiratory transmembrane sodium transport in mitochondria and bacteria coupled to the NADH oxidation and ubiquinone reduction.
What is the Nrf2 pathway?
A major mechanism in the cellular defense against oxidative or electrophilic stress is activation of the Nrf2-antioxidant response element signaling pathway, which controls the expression of genes whose protein products are involved in the detoxication and elimination of reactive oxidants and electrophilic agents …
What is the function of NQO1?
NQO1 is localized to Bergmann glia in the cerebellum and a subset of the oligodendrocytes throughout the brain, and a role is suggested for NQO1 in myelination in the central nervous system or in the insulating/wrapping function of glial cells. Dynamics of NADPH diaphorase activity in raphe neurons during chronic treatment with opiates
Does Nrf2 and NQO1 expression predict prognosis in NSCLC patients?
NQO1 is a potential drug target for host directed therapy for tuberculosis. These results indicate that dual-negative expression of Nrf2 and NQO1 is predictive of a better prognosis in NSCLC patients.
Does a ketogenic diet increase NQO1 activation?
NQO1 activation has a hypotensive effect mediated by eNOS activation via cellular NAD (+)/NADH ratio modulation in an animal model. The nuclear factor Nrf2 target, NAD (P)H:quinone oxidoreductase (NQO1), exhibits increased activity in both hippocampus and liver after 3 weeks of a ketogenic diet.
Is nrf2/nqo1 an independent risk factor for endocrine-resistant breast cancer recurrence?
Overexpression of Nrf2/Nqo1 was also associated with multiple intrahepatic recurrences (P = .0073) and was an independent risk factor for poor prognosis (P = .0031). The effects of Plumbagin (PLB) in endocrine-resistant breast cancer cells is dependent on NQO1’s activity.
