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• W3047183072 endingPage "118815" @default.
• W3047183072 startingPage "118815" @default.
• W3047183072 abstract "Regulation of metabolism is emerging as a major output of circadian clock circuitry in mammals. Accordingly, mitochondrial oxidative metabolism undergoes both in vivo and in vitro daily oscillatory activities. In a previous study we showed that both glycolysis and mitochondrial oxygen consumption display a similar time-resolved rhythmic activity in synchronized HepG2 cell cultures, which translates in overall bioenergetic changes as here documented by measurement of the ATP level. Treatment of synchronized cells with specific metabolic inhibitors unveiled pyruvate as a major source of reducing equivalents to the respiratory chain with its oxidation driven by the rhythmic (de)phosphorylation of pyruvate dehydrogenase. Further investigation enabled to causally link the autonomous cadenced mitochondrial respiration to a synchronous increase of the mitochondrial Ca 2+ . The rhythmic change of the mitochondrial respiration was dampened by inhibitors of the mitochondrial Ca 2+ uniporter as well as of the ryanodine receptor Ca 2+ channel or the ADPR cyclase, indicating that the mitochondrial Ca 2+ influx originated from the ER store, likely at contact sites with the mitochondrial compartment. Notably, blockage of the mitochondrial Ca 2+ influx resulted in deregulation of the expression of canonical clock genes such as BMALl1 , CLOCK , NR1D1 . All together our findings unveil a hitherto unexplored function of Ca 2+ -mediated signaling in time keeping the mitochondrial metabolism and in its feed-back modulation of the circadian clockwork. • Synchronized HepG2 cells display autonomous rhythmic oscillation of OCR. • The AMP/ATP ratio undergoes oscillation in anti-phase with the rhythmic respiration. • PDH displays RR-sensitive rhythmic changes in the phosphorylation state. • OCR oscillation is sensitive to inhibitor of MCU, RyR Ca 2+ Channel and ADPR cyclase. • RR treatment deregulates the rhythmic expression of circadian clock-related genes." @default.
• W3047183072 created "2020-08-10" @default.
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• W3047183072 date "2020-11-01" @default.
• W3047183072 modified "2023-10-16" @default.
• W3047183072 title "Mitochondrial calcium drives clock gene-dependent activation of pyruvate dehydrogenase and of oxidative phosphorylation" @default.
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• W3047183072 doi "https://doi.org/10.1016/j.bbamcr.2020.118815" @default.
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