Cited by 27Circadian rhythm and melatoninNeuropeptides and Animal PhysiologyAdrenal Hormones and Disorders

Altered Rhythm of Adrenal Clock Genes, StAR and Serum Corticosterone in VIP Receptor 2-Deficient Mice

Fahrenkrug, Jan, Georg, Birgitte, Hannibal, Jens, Jørgensen, Henrik Løvendahl·2012·Journal of Molecular Neuroscience

Abstract

The circadian time-keeping system consists of clocks in the suprachiasmatic nucleus (SCN) and in peripheral organs including an adrenal clock linked to the rhythmic corticosteroid production by regulating steroidogenic acute regulatory protein (StAR). Clock cells contain an autonomous molecular oscillator based on a group of clock genes and their protein products. Mice lacking the VPAC2 receptor display disrupted circadian rhythm of physiology and behaviour, and therefore, we using real-time RT-PCR quantified (1) the mRNAs for the clock genes Per1 and Bmal1 in the adrenal gland and SCN, (2) the adrenal Star mRNA and (3) the serum corticosterone concentration both during a light/dark (L/D) cycle and at constant darkness in wild type (WT) and VPAC2 receptor-deficient mice (VPAC2-KO). We also examined if PER1 and StAR were co-localised in the adrenal steroidogenic cells. Per1 and Bmal1 mRNA showed a 24-h rhythmic expression in the adrenal of WT mice under L/D and dark conditions. During a L/D cycle, the adrenal clock gene rhythm in VPAC2-KO mice was phase-advanced by approximately 6 h compared to WT mice and became arrhythmic in constant darkness. A significant 24-h rhythmic variation in the adrenal Star mRNA expression and circulating corticosterone concentration was similarly phase-advanced during the L/D cycle. The loss of adrenal clock gene rhythm in the VPAC2 receptor knockout mice after transfer into constant darkness was accompanied by disappearance of rhythmicity in Star mRNA expression and serum corticosterone concentration. Double immunohistochemistry showed that the PER1 protein and StAR were co-localised in the same steroidogenic cells. Circulating corticosterone plays a role in the circadian timing system and the misaligned corticosterone rhythm in the VPAC2 receptor knockout mice could be involved in their abnormal rhythms of physiology.

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Crossref · 10.1007/s12031-012-9804-7

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  • Under a 12:12 light-dark cycle, VPAC2-KO mice adrenal clock gene rhythm and corticosterone rhythm was phase-advanced compared to wild-type mice, and when lighting was changed to constant darkness, the adrenal clock genes and corticosterone secretion became arrhythmic.

    “Under a 12:12 LD cycle, the VPAC2-KO mice adrenal clock gene rhythm and corticosterone rhythm was phase-advanced compared to WT mice and when the lighting was changed to constant darkness, the adrenal clock genes and corticosterone secretion became arrhythmic173.”

    From Circadian rhythm disruption and mental health (2020) · cites this paper as [173]

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Authors
Fahrenkrug, J., Georg, B., Hannibal, J., & Jørgensen, H. L.
Affiliations
University of Copenhagen (DK)
Corresponding author
Fahrenkrug, Jan
Venue
Journal of Molecular Neuroscience
Published
2012-05-24
Volume
48
Issue
3
Pages
584-596
ISSN
  • 0895-8696 (ISSN-L)
  • 1559-1166
OpenAlex
W2038668908
Cited by
27
References
61
Citations by year
2026: 2 · 2025: 1 · 2024: 1 · 2022: 1 · 2021: 3 · 2020: 2 · 2019: 1 · 2018: 6 · 2017: 2 · 2016: 3 · 2014: 3 · 2013: 2
FWCI
1.74
Type
book chapter
Language
en
Open access
closed
Locations
  • Journal of Molecular Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • Research at the University of Copenhagen (University of Copenhagen) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
Keywords
VPAC2 receptor, circadian rhythm, corticosterone, steroidogenic acute regulatory protein, Per1, Bmal1, suprachiasmatic nucleus, steroidogenesis, constant darkness, phase advance
MeSH terms
Steroidogenic Acute Regulatory Protein, Adrenal Cortex, Adrenal Medulla, Animals, Circadian Rhythm, Corticosterone, Darkness, Gene Expression Regulation, Light, Male, Mice, Inbred C57BL, Phosphoproteins, RNA, Messenger, Suprachiasmatic Nucleus, In Situ Hybridization, Mice, Knockout, Receptors, Vasoactive Intestinal Peptide, Type II, Mice, ARNTL Transcription Factors, Period Circadian Proteins, Real-Time Polymerase Chain Reaction

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