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Toxicologic Pathology, Vol. 35, No. 4, 459-473 (2007)
DOI: 10.1080/01926230701311344
© 2007 Society of Toxicologic Pathology

Reviews

Invited Review: Emerging Role of Nrf2 in Protecting Against Hepatic and Gastrointestinal Disease

Lauren M. Aleksunes

Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut 06269, USA

José E. Manautou

Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut 06269, USA, jose.manautou{at}uconn.edu

Transcription factor NF-E2-related factor 2 (Nrf2) belongs to the basic region-leucine zipper family and is activated in response to electrophiles and reactive oxygen species. Nrf2 coordinately regulates the constitutive and inducible transcription of a wide array of genes involved in drug metabolism, detoxification, and antioxidant defenses. During periods of oxidative stress, Nrf2 is released from sequestration in the cytoplasm and translocates to the nucleus. Nrf2 binds antioxidant response elements (AREs) in the regulatory regions of target genes and activates transcription. Genetically modified mice lacking Nrf2 serve as a useful tool for identifying new ARE-regulated genes and assessing the ability of Nrf2 to confer protection against a variety of pathologies in numerous organs including the liver, intestine, lung, skin, and nervous system. With regards to the liver and gastrointestinal tract, Nrf2 knockout mice are more susceptible to acetaminophen-induced hepatocellular injury, benzo[a]pyrene-induced tumor formation and Fas-and TNF{alpha}-mediated hepatocellular apoptosis. The higher sensitivity of Nrf2 knockout mice to chemical toxicity is due in part to reduced basal and inducible expression of detoxification enzymes. Nrf2 may also be important in protecting against liver fibrosis, gallstone development, and formation of aberrant crypt foci. Research of Nrf2 has opened up new opportunities in understanding how antioxidant defense pathways are regulated, how oxidative stress contributes to disease progression and may serve as a novel target for designing therapies to prevent and treat diseases in which oxidative stress is implicated.

Key Words: Nrf2 • liver • gastrointestinal • ARE • Keap1 • oxidative stress.

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