Downregulation of Keap1 confers features of a fasted metabolic state

Elena V. Knatko, Michael H. Tatham, Ying Zhang, Cecilia Castro, Maureen Higgins, Sharadha Dayalan Naidu, Chiara Leonardi, Laureano de la Vega, Tadashi Honda, Julian L. Griffin, Ronald T. Hay, Albena T. Dinkova-Kostova (Lead / Corresponding author)

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Abstract

Transcription factor nuclear factor erythroid 2 p45-related factor 2 (Nrf2) and its main negative regulator, Kelch-like ECH associated protein 1 (Keap1), are at the interface between redox and intermediary metabolism, allowing adaptation and survival under conditions of oxidative, inflammatory and metabolic stress. Nrf2 is the principal determinant of redox homeostasis, and contributes to mitochondrial function and integrity, and cellular bioenergetics. Using proteomics and lipidomics, we show that genetic downregulation of Keap1 in mice, and the consequent Nrf2 activation to pharmacologically-relevant levels, leads to upregulation of carboxylesterase 1 (Ces1) and acyl-CoA oxidase 2 (Acox2), decreases triglycerides levels, and alters the lipidome. This is accompanied by downregulation of hepatic ATP-citrate lyase (Acly) and decreased levels of acetyl-CoA, a trigger for autophagy. These findings suggest that downregulation of Keap1 confers features of a fasted metabolic state, which is an important consideration in the drug development of Keap1-targeting pharmacologic Nrf2 activators.
Original languageEnglish
Article number101638
Number of pages48
JournaliScience
Volume23
Issue number10
Early online date6 Oct 2020
DOIs
Publication statusPublished - Oct 2020

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