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Regular feeding plays an important role in cholesterol homeostasis through the liver circadian clock. | LitMetric

AI Article Synopsis

  • The study investigates the role of the liver's internal clock in regulating cholesterol levels and its connection to circadian rhythms in mammals.
  • Researchers implemented a specific feeding schedule with high-cholesterol meals and observed that the rats developed high cholesterol levels and disrupted liver clock gene expression.
  • The findings highlight that meal timing, alongside the type and amount of food, significantly impacts health, particularly concerning cholesterol metabolism.

Article Abstract

Rationale: Peripheral clock control and the relevance of the circadian rhythm to physiology and disease are major questions in mammalian circadian biology.

Objective: We examined the physiological functions of the liver clock.

Methods And Results: We established a suppressed feeding schedule regimen constituting a high-cholesterol diet delivered every 6 hours without changes in energy and cholesterol intake. We found that rats exposed to this regimen developed hypercholesteremia. In the liver, the rhythmicity of expression of several clock genes was disrupted. Furthermore, the nocturnal expression of the CYP7A1 gene, which encodes the rate-limiting enzyme for the conversion of cholesterol to bile acids, was shifted to a diurnal pattern. Indeed, suppression of a regular feeding rhythm increased the secretion rate of very-low-density lipoprotein cholesterol from the liver and decreased the excretion of fecal bile acids.

Conclusions: Our results demonstrated that not only the amount and quality of food but also the timing of meals has crucial health implications.

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Source
http://dx.doi.org/10.1161/CIRCRESAHA.109.199034DOI Listing

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