Hydrocortisone 21-acetate, Glucocorticoid anti-inflammatory agent

Supplementary information

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Nrf2 (Nuclear factor erythroid 2–related factor 2) is a transcription factor that plays an important role in regulating the expression of antioxidant proteins. It binds to antioxidant response elements (ARE) to activate genes involved in oxidative stress response. Nrf2 has an approximate mass of 66 kDa and is expressed in various tissues including the liver kidney muscle and brain. Some alternate names for Nrf2 include NFE2L2. This protein gets released from its cytoplasmic inhibitor Keap1 when oxidative stress occurs.

Biological function summary

Nrf2 regulates cellular defense against oxidative damage by activating transcription of genes encoding antioxidant enzymes. It is often part of a complex that includes Keap1 which serves as a sensor for oxidative stress. This interaction governs its nuclear translocation and subsequent gene activation. Nrf2's activity promotes the production of enzymes like glutathione S-transferase and heme oxygenase-1 which aid in detoxifying reactive substances and maintaining cellular redox homeostasis.

Pathways

Nrf2 functions significantly within the oxidative stress response and detoxification pathways. It connects closely with the MAPK (mitogen-activated protein kinase) pathway which influences its stabilization and activity. Moreover Nrf2 interplays with the PI3K/AKT pathway influencing downstream defensive responses against cellular stress. These pathways provide the necessary signals regulating the nuclear translocation of Nrf2 and subsequent modulation of antioxidant gene expression.

Nrf2 has a notable connection with neurodegenerative diseases and cancer. Its dysregulation often contributes to the pathogenesis of these conditions. In cancer excessive activation of Nrf2 can result in chemotherapy resistance by increasing the expression of detoxifying enzymes. Proteins like Keap1 which normally inhibit Nrf2 are frequently mutated in several tumors leading to persistent Nrf2 activation. Additionally in neurodegenerative diseases insufficient Nrf2 activity can lead to increased oxidative stress and neuronal damage marking its importance in disease management.