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• W4380450159 abstract "ABSTRACT Objective Molecular clocks and daily feeding cycles support metabolism in peripheral tissues. Although the roles of local clocks and feeding is well defined at the transcriptional level, their impact on governing protein abundances in peripheral tissues is unclear. Here, we determine the relative contributions of the local molecular clock and daily feeding cycles on liver and muscle proteomes during feeding. Methods LC-MS/MS was performed on liver and skeletal muscle harvested four hours into the dark phase from wild-type (WT), Bmal1 knockout (KO), and liver- and muscle- Bmal1 -rescued (LMRE) mice housed under 12-h light/12-h dark cycles with either ad libitum feeding or nighttime-restricted feeding. Additional molecular and metabolic analyses were performed on liver and cultured hepatocytes. Results Feeding-fasting cycles had only minimal effects on liver and none on muscle. In contrast, Bmal1 KO altered the abundance of 674 proteins in liver, and 80 in muscle. Rescue of liver and muscle Bmal1 restored 50% of proteins in liver and 25% in muscle. These included proteins involved in carbohydrate metabolism in muscle and in fatty acid oxidation in liver. For liver, proteins involved in de novo lipogenesis were largely dependent on Bmal1 function in other tissues (i.e., the wider clock system). Proteins regulated by BMAL1 were enriched for secreted proteins; we determined that the maintenance of FGF1 abundance requires liver BMAL1, and that autocrine signaling through FGF1 is necessary and sufficient for mitochondrial respiration in hepatocytes. Conclusions BMAL1 in liver and muscle is a more potent regulator of dark phase proteomes than daily feeding cycles, highlighting the need to assess protein levels in addition to mRNA when investigating clock mechanisms. The proteome is more extensively regulated by BMAL1 in liver than in muscle, and numerous metabolic pathways in peripheral tissues are reliant on the function of the clock system as a whole." @default.
• W4380450159 created "2023-06-14" @default.
• W4380450159 creator A5013001058 @default.
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• W4380450159 date "2023-06-13" @default.
• W4380450159 modified "2023-10-16" @default.
• W4380450159 title "Impact of<i>Bmal1</i>rescue and time-restricted feeding on liver and muscle proteomes during the active phase in mice" @default.
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• W4380450159 doi "https://doi.org/10.1101/2023.06.12.544652" @default.
• W4380450159 hasPublicationYear "2023" @default.
• W4380450159 type Work @default.

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