Abstract
Two central regulators, nuclear factor-erythroid 2 p45-related factor 2 (NRF2) and heat shock factor 1 (HSF1), control the KEAP1/NRF2/ARE pathway and the heat shock response, two essential cellular defense mechanisms. Both systems are highly inducible under conditions of stress. Many small molecules, including certain phytochemicals, such as isothiocyanates and phenylpropanoids, and/or their metabolites, have the capacity to induce the KEAP1/NRF2/ARE pathway. Recent results suggest that a common signal that is sensed through cysteine modification(s) within Kelch-like ECH-associated protein 1 (KEAP1) and HSF1, or possibly within a negative regulator of HSF1, is responsible for triggering both pathways. Celastrol, withaferin A, gedunin, curcumin, and sulforaphane are examples of structurally diverse phytochemicals with a common chemical signature: reactivity with sulfhydryl groups. This reactivity underlies their biological activities as multitarget agents for which protective effects have been documented in numerous animal models of human disease and which include induction of large networks of transcriptional programs regulated by transcription factors NRF2 and HSF1.
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The authors are extremely grateful to the Biotechnology and Biological Sciences Research Council (BBSRC, Project Grant BB/J007498/1) and Research Councils UK for financial support.
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Dinkova-Kostova, A., Zhang, Y., Naidu, S., Kostov, R., Pheely, A., Calabrese, V. (2013). Sulfhydryl-Reactive Phytochemicals as Dual Activators of Transcription Factors NRF2 and HSF1. In: Gang, D. (eds) 50 Years of Phytochemistry Research. Recent Advances in Phytochemistry, vol 43. Springer, Cham. https://doi.org/10.1007/978-3-319-00581-2_6
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