Journal of Comparative Physiology A

, Volume 192, Issue 7, pp 769–775

Impaired daily glucocorticoid rhythm in Per1Brd mice

  • Robert Dallmann
  • Chadi Touma
  • Rupert Palme
  • Urs Albrecht
  • Stephan Steinlechner
Original Paper

DOI: 10.1007/s00359-006-0114-9

Cite this article as:
Dallmann, R., Touma, C., Palme, R. et al. J Comp Physiol A (2006) 192: 769. doi:10.1007/s00359-006-0114-9

Abstract

Biological clocks have evolved in all kinds of organisms in order to anticipate and adjust to the daily light–dark cycle. Within the last decade, the molecular machinery underlying the circadian system was unraveled. In the present study, the impact of the loss of the Per1 or Per2 genes, key components of the core clock oscillator, on body mass, food and water intake, glucose metabolism, and hypothalamic-pituitary-adrenal axis, was investigated in the Per1Brd and Per2Brd mouse models. The results reveal that the lack of Per1 but not Per2 has severe consequences for the regulation of these parameters. Specifically, in Per1Brd animals, we found an impaired daily glucocorticoid rhythm, with markedly elevated levels during the day compared to control animals. In addition, Per1Brd mice showed significant differences in body mass as well as food and water intake. Although the Per1Brd are lighter than wildtype mice, food and water intake per gram body mass is elevated. In addition, the Per1Brd mice exhibit an increased glucose metabolism after i.p. injection with glucose. In conclusion, our study presents first evidence for a link between an altered metabolism in Per1 and Per2 deficient mice, which in the case of the Per1Brd animals might be due to an impaired corticosterone rhythm.

Keywords

Adrenocortical activityCircadian rhythmClock geneFecal glucocorticoid metabolitesPeriod

Abbreviations

SCN

Suprachiasmatic nucleus

HPA axis

Hypothalamic-pituitary-adrenal axis

Per

Period

CM

Corticosterone metabolites

LD

Light/dark cycle

WT

Wildtype

GC

Glucocorticoid

AUC

Area under curve

Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Robert Dallmann
    • 1
    • 5
  • Chadi Touma
    • 2
  • Rupert Palme
    • 3
  • Urs Albrecht
    • 4
  • Stephan Steinlechner
    • 1
  1. 1.Institute of ZoologySchool of Veterinary Medicine HannoverHannoverGermany
  2. 2.Department of Behavioral NeuroendocrinologyMax Planck Institute of PsychiatryMunichGermany
  3. 3.Institute of Biochemistry, Department of Natural SciencesUniversity of Veterinary MedicineViennaAustria
  4. 4.Department of Medicine, Division of BiochemistryUniversity of FribourgFribourgSwitzerland
  5. 5.Department of Neurobiology University of Massachusetts Medical SchoolWorcesterUSA