Exposing 24-hour cycles in bile acids of male humans

Adesola T. Bello, Magali H. Sarafian, Elizabeth A. Wimborne, Benita Middleton, Victoria L. Revell, Florence I. Raynaud, Namrata R. Chowdhury, Daan R. Veen, Debra J. Skene and Jonathan R. Swann ()
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Adesola T. Bello: Imperial College London
Magali H. Sarafian: Bioaster Microbiology Technology Institute
Elizabeth A. Wimborne: University of Southampton
Benita Middleton: Guildford
Victoria L. Revell: Guildford
Florence I. Raynaud: The Institute of Cancer Research
Namrata R. Chowdhury: Guildford
Daan R. Veen: Guildford
Debra J. Skene: Guildford
Jonathan R. Swann: Imperial College London

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Bile acids are trans-genomic molecules arising from the concerted metabolism of the human host and the intestinal microbiota and are important for digestion, energy homeostasis and metabolic regulation. While diurnal variation has been demonstrated in the enterohepatic circulation and the gut microbiota, existing human data are poorly resolved, and the influence of the host circadian system has not been determined. Using entrained laboratory protocols, we demonstrate robust daily rhythms in the circulating bile acid pool in healthy male participants. We identify temporal relationships between bile acids and plasma lipids and show that these relationships are lost following sleep deprivation. We also highlight that bile acid rhythmicity is predominantly lost when environmental timing cues are held constant. Here we show that the environment is a stronger determinant of these temporal dynamics than the intrinsic circadian system of the host. This has significance for the intimate relationship between circadian timing and metabolism.

Date: 2024
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DOI: 10.1038/s41467-024-53673-9

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