Differential entrainment of peripheral clocks in the rat by glucocorticoid and feeding

Endocrinology. 2012 May;153(5):2277-86. doi: 10.1210/en.2011-1794. Epub 2012 Mar 20.

Abstract

The suprachiasmatic nucleus is the master circadian clock and resets the peripheral clocks via various pathways. Glucocorticoids and daily feeding are major time cues for entraining most peripheral clocks. However, recent studies have suggested that the dominant timing factor differs among organs and tissues. In our current study, we reveal differences in the entrainment properties of the peripheral clocks in the liver, kidney, and lung through restricted feeding (RF) and antiphasic corticosterone (CORT) injections in adrenalectomized rats. The peripheral clocks in the kidney and lung were found to be entrained by a daily stimulus from CORT administration, irrespective of the meal time. In contrast, the liver clock was observed to be entrained by an RF regimen, even if daily CORT injections were given at antiphase. These results indicate that glucocorticoids are a strong zeitgeber that overcomes other entrainment factors regulating the peripheral oscillators in the kidney and lung and that RF is a dominant mediator of the entrainment ability of the circadian clock in the liver.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adrenalectomy
  • Animals
  • Circadian Clocks / drug effects*
  • Circadian Clocks / physiology
  • Circadian Rhythm / drug effects
  • Circadian Rhythm / physiology
  • Corticosterone / pharmacology*
  • Feeding Behavior / physiology*
  • Gene Expression / drug effects
  • Glucocorticoids / pharmacology*
  • Kidney / drug effects
  • Kidney / metabolism
  • Liver / drug effects
  • Liver / metabolism
  • Lung / drug effects
  • Lung / metabolism
  • Male
  • Period Circadian Proteins / genetics
  • Period Circadian Proteins / metabolism
  • Rats
  • Rats, Wistar
  • Suprachiasmatic Nucleus / drug effects*
  • Suprachiasmatic Nucleus / physiology

Substances

  • Glucocorticoids
  • Period Circadian Proteins
  • Corticosterone