Cited by 39Circadian rhythm and melatoninHypothalamic control of reproductive hormonesPregnancy-related medical research

Circadian myometrial and endocrine rhythms in the pregnant rhesus macaque: Effects of constant light and timed melatonin infusion

Matsumoto, Toshihiko, Hess, David L., Kaushal, Kanchan M., Valenzuela, Guillermo J., Yellon, Steven M., Ducsay, Charles A.·1991·American Journal of Obstetrics and Gynecology

Abstract

Six chronically catheterized rhesus macaques maintained on a 12-hour-light/dark cycle (lights on from 7 AM to 7 PM) showed a nocturnal uterine activity rhythm with peak contractile events between 9 and 11 PM (p less than 0.05). In blood samples collected at 3-hour intervals over a 24-hour period, we determined that plasma melatonin and progesterone concentrations were elevated at night whereas estradiol, estrone, and cortisol reached peak concentrations in the early morning (p less than 0.05). Lights were then left on for the remainder of the study. After 12 days in constant light, daily rhythms in uterine activity and plasma steroid levels were relatively unchanged, whereas melatonin concentrations were suppressed. Animals then received a timed infusion of melatonin (0.2 mg/kg/hr each day from 7 PM to 6 AM daily until delivery). The nocturnal uterine activity rhythm and the rhythms in plasma steroid concentrations were maintained. We conclude that the 24-hour patterns in maternal uterine activity and plasma steroid hormone levels are circadian rhythms generated by an endogenous biologic clock and do not appear to be driven by the pattern of melatonin in circulation.

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Crossref · 10.1016/0002-9378(91)90032-m

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  • Exposing pregnant non-human primates to constant light suppresses the emergence of melatonin and body temperature rhythms in their offspring following birth, suggesting that maternal rhythms are important for the early brain development of fetal circadian systems.

    “Exposing pregnant NHPs to constant light suppresses the emergence of melatonin and body temperature rhythms in their offspring following birth42–44, suggesting that maternal rhythms are important for the early brain development of fetal circadian systems45.”

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Authors
Matsumoto, T., Hess, D. L., Kaushal, K. M., Valenzuela, G. J., Yellon, S. M., & Ducsay, C. A.
Affiliations
Loma Linda University (US)
Corresponding author
Ducsay, Charles A.
Venue
American Journal of Obstetrics and Gynecology
Publisher
Elsevier BV
Published
1991-12
Volume
165
Issue
6
Pages
1777-1784
ISSN
0002-9378 (ISSN-L)
OpenAlex
W2016656607
Cited by
39
References
34
Citations by year
2025: 2 · 2022: 1 · 2018: 1 · 2015: 1 · 2014: 1 · 2013: 1 · 2012: 1
FWCI
2.84
Type
journal article
Language
en
Open access
closed
Locations
  • American Journal of Obstetrics and Gynecology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r29hd022865-04)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD 22865, HD 18185)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Pregnancy-related medical research
Keywords
circadian rhythm, uterine contractility, melatonin, progesterone, estradiol, cortisol, endocrine rhythms, constant light, rhesus monkeys, pregnancy, biological clock, steroid secretion
MeSH terms
Animals, Circadian Rhythm, Estradiol, Estrogens, Estrone, Female, Hydrocortisone, Macaca mulatta, Melatonin, Pregnancy, Progesterone, Uterine Contraction

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