Cited by 47Circadian rhythm and melatoninSleep and Wakefulness ResearchHypothalamic control of reproductive hormones

The DOI matches its Crossref record.

Entrainment of Syrian hamster circadian activity rhythms by neonatal melatonin injections

Grosse, J., Velickovic, A., Davis, F. C.·1996·American Journal of Physiology-Regulatory, Integrative and Comparative Physiology

Abstract

The circadian rhythms of fetal and neonatal rodents are entrained by their mother. This entrainment is dependent upon the maternal suprachiasmatic nucleus (SCN), but the mechanism of entrainment is unknown. Administration of the pineal hormone melatonin to pregnant, SCN-lesioned female Syrian hamsters entrains the activity rhythms of their hamster pups. The aim of this study was to determine whether melatonin injected directly in neonatal Syrian hamsters is able to entrain circadian rhythms and, if so, for how long this effect persists during development. Injection of melatonin in two groups of hamster pups at opposite phases on postnatal days 1-5 entrained the onset of activity rhythms on the day of weaning to two phases 10.67 h apart. Melatonin injection did not entrain activity rhythms to opposite phases on either postnatal days 6-10 or 21-25. Vehicle injection did not entrain animals to opposite phases at any of the ages studied. These results demonstrate that melatonin is able to act directly on the neonate to cause entrainment and that this effect disappears after postnatal day 6.

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Crossref · 10.1152/ajpregu.1996.270.3.r533

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Authors
Grosse, J., Velickovic, A., & Davis, F. C.
Affiliations
Northeastern University (US)
Venue
American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
Published
1996-03-01
Volume
270
Issue
3
Pages
R533-R540
ISSN
  • 0363-6119 (ISSN-L)
  • 1522-1490
OpenAlex
W2200251599
Cited by
47
References
0
Citations by year
2022: 1 · 2017: 1 · 2016: 1 · 2015: 2 · 2014: 1 · 2012: 1
FWCI
1.96
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Physiology-Regulatory, Integrative and Comparative Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD 18686)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
Keywords
melatonin, circadian entrainment, neonatal development, golden hamster, activity rhythms, suprachiasmatic nucleus, pineal gland, postnatal development, weaning
MeSH terms
Animals, Animals, Newborn, Circadian Rhythm, Female, Cricetinae, Male, Melatonin, Mesocricetus, Pregnancy, Suprachiasmatic Nucleus

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