The rise of antioxidant signaling--the evolution and hormetic actions of Nrf2

Toxicology and Applied Pharmacology
Jonathan Maher, Masayuki Yamamoto

Abstract

Organisms have evolved sophisticated and redundant mechanisms to manage oxidative and electrophilic challenges that arise from internal metabolism or xenobiotic challenge for survival. NF-E2-related factor 2 (Nrf2) is a transcription factor that has evolved over millennia from primitive origins, with homologues traceable back to invertebrate Caenorhabditis and Drosophila species. The ancestry of Nrf2 clearly has deep-seated roots in hematopoiesis, yet has diversified into a transcription factor that can mediate a multitude of antioxidant signaling and detoxification genes. In higher organisms, a more sophisticated means of tightly regulating Nrf2 activity was introduced via the cysteine-rich kelch-like ECH-associated protein 1 (Keap1), thus suggesting a need to modulate Nrf2 activity. This is evidenced in Keap1(-/-) mice, which succumb to juvenile mortality due to hyperkeratosis of the gastrointestinal tract. Although Nrf2 activation protects against acute toxicity and prevents or attenuates several disease states, constitutive activation in some tumors leads to poor clinical outcomes, suggesting Nrf2 has evolved in response to a multitude of selective pressures. The purpose of this review is to examine the origins of Nrf2, whi...Continue Reading

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