Time of day and nutrients in feeding govern daily expression rhythms of the gene for sterol regulatory element-binding protein (SREBP)-1 in the mouse liver

Eriko Matsumoto, Akinori Ishihara, Saki Tamai, Ayako Nemoto, Katsuro Iwase, Takaki Hiwasa, Shigenobu Shibata, Masaki Takiguchi*

*この研究の対応する著者

研究成果: Article査読

44 被引用数 (Scopus)

抄録

Sterol regulatory element-binding protein-1 (SREBP-1) plays a central role in transcriptional regulation of genes for hepatic lipid synthesis that utilizes diet-derived nutrients such as carbohydrates and amino acids, and expression of SREBP-1 exhibits daily rhythms with a peak in the nocturnal feeding period under standard housing conditions of mice. Here, we report that the Srebp-1 expression rhythm shows time cue-independent and Clock mutation-sensitive circadian nature, and is synchronized with varied photoperiods apparently through entrainment of locomotor activity and food intake. Fasting caused diminution of Srebp-1 expression, while diabetic db/db and ob/ob mice showed constantly high expression with loss of rhythmicity. Time-restricted feedings during mid-light and mid-dark periods exhibited differential effects, the latter causing more severe damping of the oscillation. Therefore, "when to eat in a day (the light/dark cycle)," rather than "whenever to eat in a day," is a critical determinant to shape the daily rhythm of Srebp-1 expression. We further found that a high-carbohydrate diet and a high-protein diet, as well as a high-fat diet, cause phase shifts of the oscillation peak into the light period, underlining the importance of "what to eat." Daily rhythms of SREBP-1 protein levels and Akt phosphorylation levels also exhibited nutrient-responsive changes. Taken together, these findings provide a model for mechanisms by which time of day and nutrients in feeding shape daily rhythms of the Srebp-1 expression and possibly a number of other physiological functions with interindividual and interdaily differences in human beings and wild animals subjected to day-by-day changes in dietary timing and nutrients.

本文言語English
ページ(範囲)33028-33036
ページ数9
ジャーナルJournal of Biological Chemistry
285
43
DOI
出版ステータスPublished - 2010 10月 22

ASJC Scopus subject areas

  • 生化学
  • 分子生物学
  • 細胞生物学

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