Journal
CELL REPORTS
Volume 34, Issue 5, Pages -Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2021.108710
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Funding
- VILLUM Foundation [VKR023439]
- VILLUM Center for Bioanalytical Sciences [VKR023179]
- Lundbeckfonden [R44-A4342, R54-A5858]
- European Union [HEALTH-F2-2013-602222]
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This study investigates the diurnal regulation of whole-body lipid metabolism through time-series multi-omics analyses of liver and plasma, revealing that molecular oscillations are mainly entrained by adaptations to fasting, food intake, and the postprandial state. The research also highlights the key role of the hepatic phosphatidylethanolamine (PE) methylation pathway in diurnal regulation, leading to the production of two pools of oscillating phosphatidylcholine (PC) molecules in the circulation.
Diurnal regulation of whole-body lipid metabolism plays a vital role in metabolic health. Although changes in lipid levels across the diurnal cycle have been investigated, the system-wide molecular responses to both short-acting fasting-feeding transitions and longer-timescale circadian rhythms have not been explored in parallel. Here, we perform time-series multi-omics analyses of liver and plasma revealing that the majority of molecular oscillations are entrained by adaptations to fasting, food intake, and the postprandial state. By developing algorithms for lipid structure enrichment analysis and lipid molecular crosstalk between tissues, we find that the hepatic phosphatidylethanolamine (PE) methylation pathway is diurnally regulated, giving rise to two pools of oscillating phosphatidylcholine (PC) molecules in the circulation, which are coupled to secretion of either very low-density lipoprotein (VLDL) or high-density lipoprotein (HDL) particles. Our work demonstrates that lipid molecular timeline profiling across tissues is key to disentangling complex metabolic processes and provides a critical resource for the study of whole-body lipid metabolism.
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