Refeeding after fasting elicits insulin-dependent regulation of per2 and Rev-erbα with shifts in the liver clock

Yu Tahara, Makiko Otsuka, Yuta Fuse, Akiko Hirao, Shigenobu Shibata

研究成果: Article査読

84 被引用数 (Scopus)

抄録

The mammalian circadian clock is known to be entrained by both a daily light-dark cycle and daily feeding cycle. However, the mechanisms of feeding-induced entrainment are not as fully understood as those of light entrainment. To elucidate the first step of entrainment of the liver clock, we identified the circadian clock gene(s) that show both phase advance and acute change of gene expression during the early term of the daytime refeeding schedule in mice. The expressions of liver Per2 and Rev-erbα genes were phase-advanced within 1 day of refeeding. Additionally, the upregulation of Per2 mRNA and down-regulation of Rev-erbα mRNA were induced within 2 hours, not only by food intake but also by insulin injection in intact mice. These expression changes by food intake were not revealed in streptozotocin-treated insulin-deficient mice, but insulin injection was able to recover the impairment of Per2 and Rev-erbα gene expression. Furthermore, we demonstrated using an ex vivo luciferase monitoring system that insulin injection during the daytime causes a phase advance of liver Per2 expression rhythm in Per2::luciferase knock-in mice. In embryonic fibroblasts from Per2::luciferase knock-in mice, insulin infusion caused an acute increase of Per2 gene expression and a similar phase advance of Per2 expression rhythm. Our results indicate that an acute change of Per2 and Rev-erbα gene expression mediated by refeeding-induced insulin secretion is a critical step mediating the early phase of feeding-induced entrainment of the liver clock.

本文言語English
ページ(範囲)230-240
ページ数11
ジャーナルJournal of Biological Rhythms
26
3
DOI
出版ステータスPublished - 2011 6

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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