Cited by 131Circadian rhythm and melatoninmelanin and skin pigmentationSleep and Wakefulness Research

Melatonin in mice: rhythms, response to light, adrenergic stimulation, and metabolism

Kennaway, D. J., Voultsios, A., Varcoe, T. J., Moyer, R. W.·2002·American Journal of Physiology-Regulatory, Integrative and Comparative Physiology

Abstract

There has been relatively little research conducted on pineal melatonin production in laboratory mice, in part, due to the lack of appropriate assays. We studied the pineal and plasma rhythm, response to light, adrenergic stimulation, and metabolism of melatonin in CBA mice. With the use of a sensitive and specific melatonin RIA, melatonin was detected in the pineal glands at all times of the day >21 fmol/gland in CBA mice but not in C57Bl mice. Both plasma and pineal melatonin levels peaked 2 h before dawn in a 12:12-h light-dark photoperiod (162 ± 31 pM and 1,804 ± 514 fmol/gland, respectively). A brief light pulse (200 lx/15 min), 2 h before lights on, suppressed both plasma and pineal melatonin to near basal levels within 30 min. Exposure to light pulses 4 h after lights off or 2 h before lights on resulted in delays and advances, respectively, in the early morning decline of plasma and pineal melatonin on the next cycle. Administration of the β-adrenergic agonist isoproterenol (20 mg/kg) 2 and 4 h after lights on in the morning resulted in a fivefold increase in plasma and pineal melatonin 2.5 to 3 h after the first injection. In the mouse, unlike the rat, melatonin was shown to be metabolized almost exclusively to 6-glucuronylmelatonin rather than 6-sulphatoxymelatonin. These studies have shown that the appropriate methodological tools are now available for studying melatonin rhythms in mice.

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Crossref · 10.1152/ajpregu.00360.2001

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Authors
Kennaway, D. J., Voultsios, A., Varcoe, T. J., & Moyer, R. W.
Affiliations
Adelaide University (AU)
Venue
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
Published
2002-02-01
Volume
282
Issue
2
Pages
R358-R365
ISSN
  • 0363-6119 (ISSN-L)
  • 1522-1490
OpenAlex
W2113772589
Cited by
131
References
37
Citations by year
2026: 6 · 2025: 3 · 2024: 6 · 2023: 6 · 2022: 7 · 2021: 10 · 2020: 4 · 2019: 9 · 2018: 7 · 2017: 4 · 2016: 8 · 2015: 6 · 2014: 5 · 2013: 8 · 2012: 7
FWCI
1.26
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (publishedVersion)
  • PubMed (publishedVersion)
  • Adelaide Research & Scholarship (AR&S) (University of Adelaide) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › melanin and skin pigmentation
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
Keywords
melatonin, pineal gland, circadian rhythm, light response, adrenergic stimulation, isoproterenol, beta-adrenergic agonists, melatonin metabolism, 6-sulfatoxymelatonin, plasma melatonin, CBA mice, C57BL mice, photoperiod
MeSH terms
Adrenergic beta-Agonists, Animals, Circadian Rhythm, Isoproterenol, Lighting, Male, Melatonin, Mice, Inbred BALB C, Mice, Inbred CBA, Mice, Inbred C57BL, Pineal Gland, Radioimmunoassay, Species Specificity, Photoperiod, Mice

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