Many dietary phytochemicals exhibit health-beneficial effects including preven-tion of diseases such as cancer,as well as neurological,cardiovascular,inflam-matory,and metabolic diseases.Evolutionarily,herbivorous and omnivorousanimals have been ingesting plants.This interaction between“animal-plant”ecosystems has resulted in an elaborate system of detoxification and defensemechanisms evolved by animals including humans.Mammalian cells,includinghuman cells,respond to these dietary phytochemicals by“non-classical receptorsensing”mechanisms of electrophilic chemical-stress typified by“thiol-modu-lated”cellular signaling events primarily leading to the gene expression of phar-macologically beneficial effects,but sometimes unwanted cytotoxicity also.Ourlaboratory has been studying two groups of dietary phytochemical cancer-chemopreventive compounds (isothiocyanates and polyphenols),which areeffective in chemical-induced,as well as genetically-induced,animal carcinogen-esis models.These compounds typically generate“cellular stress”and modulategene expression of phase Ⅱ detoxifying/antioxidant enzymes.Electrophiles,reac-tive oxygen species,and reactive nitrogen species are known to act as secondmessengers in the modulation of many cellular signaling pathways leading togene expression changes and pharmacological responses.Redox-sensitive tran-scription factors such as nuclear factor-E2-related factor 2 (Nrf2),AP-1,NF-κB,tocite a few examples,sense and transduce changes in the cellular redox status andmodulate gene expression responses to oxidative and electrophilic stresses,pre-sumably via sulfhydryl modification of critical cysteine residues found on theseproteins and/or other upstream redox-sensitive molecular targets.In the currentreview,we will explore dietary cancer chemopreventive phytochemicals,discussthe link between oxidative/electrophilic stresses and the redox circuitry,and con-sider different redox-sensitive transcription factors.We will also discuss thekelch-like erythroid Cap’n’Collar homologue-associated protein 1 (Keap 1)-Nrf2axis in redox signaling of induction of phase Ⅱ detoxifying/antioxidant defensemechanisms,an important target and preventive strategy for normal cells againstcarcinogenesis,and the converse inhibition of cell growth/inflammatory signalingpathways that would confer therapeutic intervention in many types of cancers.Finally,we will summarize the Nrf2 paradigm in gene expression,the pharma-cotoxicogenomic relevance of redox-sensitive Nrf2,and the redox regulation ofcell death mechanisms. Many dietary phytochemicals exhibit health-beneficiaries including preven-tion of diseases such as cancer, as well as neurological, cardiovascular, inflam-matory, and metabolic diseases. Evolutionarily, herbivorous and omnivorous animals have been ingesting plants. This interaction between “animal- plant ”ecosystems has resulted in an elaborate system of detoxification and defense mechanisms evolved by animals including humans. Mammalian cells, including human cells, respond to these dietary phytochemicals by “ non-classical receptorsensing ”mechanisms of electrophilic chemical-stress typified by thiol-modu-lated “cellular signaling adjectives leading to the gene expression of phar-maccy beneficial effects, but sometimes unwanted cytotoxicity also. Our laboratory has been studying two groups of dietary phytochemical cancer-chemopreventive compounds (isothiocyanates and polyphenols), which areeffective in chemical-induced, as well as genetically-induced, animal carcinogen-esis models se compounds typically generate ”cellular stress " and modulate gene expression of phase II detoxifying / antioxidant enzymes. Electrophiles, reac-tive oxygen species, and reactive nitrogen species are known to act as second messengers in the modulation of many cellular signaling pathways leading to gene expression changes and pharmacological responses. Redox-sensitive tran-scription factors such as nuclear factor-E2-related factor 2 (Nrf2), AP-1, NF- κB, tocite a few examples, sense and transduce changes in the cellular redox status and gene gene expression responses to oxidative and electrophilic stresses, pre-sumably via sulfhydryl modification of critical cysteine ​​residues found on these proteins and / or other upstream redox-sensitive molecular targets. the current review, we will explore dietary cancer chemopreventive phytochemicals, discussthe link between oxidative / electrophilic stresses and the redox circuitry, and con-sider different redox-sensitive transcription factors. We will also discuss thekelch-like erythroid Cap’n’Collar homologue-associated protein 1 (Keap 1) -Nrf2axis in redox signaling of induction of phase II detoxifying / antioxidant defense mechanisms, an important target and preventive strategy for normal cells againstcarcinogenesis, and the converse inhibition of cell growth / inflammatory signalingpathways that would confer therapeutic intervention in many types of cancers. Finaally, we will summarize the Nrf2 paradigm in gene expression, the pharma-cotoxicogenomic relevance of redox-sensitive Nrf2, and the redox regulation of cell death mechanisms.