NRF2 regulates core and stabilizing circadian clock loops, coupling redox and timekeeping in Mus musculus

ELife
Ryan S WibleThomas R Sutter

Abstract

Diurnal oscillation of intracellular redox potential is known to couple metabolism with the circadian clock, yet the responsible mechanisms are not well understood. We show here that chemical activation of NRF2 modifies circadian gene expression and rhythmicity, with phenotypes similar to genetic NRF2 activation. Loss of Nrf2 function in mouse fibroblasts, hepatocytes and liver also altered circadian rhythms, suggesting that NRF2 stoichiometry and/or timing of expression are important to timekeeping in some cells. Consistent with this concept, activation of NRF2 at a circadian time corresponding to the peak generation of endogenous oxidative signals resulted in NRF2-dependent reinforcement of circadian amplitude. In hepatocytes, activated NRF2 bound specific enhancer regions of the core clock repressor gene Cry2, increased Cry2 expression and repressed CLOCK/BMAL1-regulated E-box transcription. Together these data indicate that NRF2 and clock comprise an interlocking loop that integrates cellular redox signals into tissue-specific circadian timekeeping.

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Datasets Mentioned

BETA
AB80588

Methods Mentioned

BETA
nuclear translocation
immunoprecipitation-PCR
ChIP-PCR
immunoprecipitation
transfection
two-hybrid
PCR
ELISA
scraping
Assay

Software Mentioned

Actimetrics
JASPAR
LumiCycle Analysis
Scramble

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