Low-Dose Dose-Response for In Vitro Nrf2-ARE Activation in Human HepG2 Cells

Dose-response : a Publication of International Hormesis Society
Kenneth T Bogen

Abstract

Kelch-like ECH-associated protein 1 (Keap1), nuclear factor erythroid 2-like factor 2-related factor 2 (Nrf2), and the antioxidant response element (ARE) are interacting components of a master regulatory signaling pathway that coordinates redox homeostasis, cytoprotective responses, and shifts in stem cell state. This study reexamined detailed dose-response (DR) data reported for in vitro Nrf2-ARE activation in human hepatoblastoma HepG2 cell lines containing either a ARE-bla or ARE-luc reporter at 12 different concentrations of each of 15 chemicals. The normalized study data were combined among chemicals exhibiting a positive response, yielding n = 531 (179) DR data for 9 (7) chemicals using the ARE-bla (ARE-luc) assay. Three-parameter linear/kth-power regression fits obtained to each combined set of ARE-bla- or ARE-luc-assay response data provided good fits (R(2) = .99 or .91, respectively, Pfit > .99) that each incorporate a highly significant negative initial linear slope (P = 4 × 10(-5) or .00025) and an overall J-shaped DR pattern. Results from this reanalysis of high-resolution ARE response data support the hypothesis that nonlinear ARE-mediated adaptive cellular responses to oxidative stress are governed by an ultrasens...Continue Reading

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Citations

Apr 25, 2017·Risk Analysis : an Official Publication of the Society for Risk Analysis·Kenneth T Bogen
Mar 6, 2021·Pharmacological Research : the Official Journal of the Italian Pharmacological Society·Edward J Calabrese, Walter J Kozumbo
Jul 16, 2021·Dose-response : a Publication of International Hormesis Society·Shizuyo SutouUNKNOWN Collaborative Study Group of Thresholds for Mutagens

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