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Circadian Rhythms of Melatonin, Cortisol, and Clock Gene Expression During Simulated Night Shift Work
Open accessAbstract
STUDY OBJECTIVES: The synchronization of peripheral circadian oscillators in humans living on atypical sleep/wake schedules is largely unknown. In this night shift work simulation, we evaluate clock gene expression in peripheral blood mononuclear cells (PBMCs) relative to reliable markers of the central circadian pacemaker. DESIGN: Participants were placed on a 10-hr delayed sleep/wake schedule simulating nighttime work followed by a daytime sleep episode. SETTING: Baseline, intermediate and final circadian evaluations were performed in the temporal isolation laboratory. PARTICIPANTS: Five healthy candidates, 18-30 years. INTERVENTIONS: Polychromatic white light of (mean +/-SEM) 6,036 +/-326 lux (approximately 17,685 +/-955 W/m2) during night shifts; dim light exposure after each night shift; an 8-hr sleep/darkness episode beginning 2 hrs after the end of each night shift. MEASUREMENTS: Melatonin and cortisol in plasma; clock genes HPER1, HPER2 and HBMAL1 RNA in PBMCs. RESULTS: Following 9 days on the night schedule, hormonal rhythms were adapted to the shifted schedule. HPER1 and HPER2 expression in PBMCs displayed significant circadian rhythmicity, which was in a conventional relationship with the shifted sleep/wake schedule. Changes in the pattern of clock gene expression were apparent as of 3 days on the shifted sleep/wake schedule. CONCLUSIONS: This preliminary study is the first documentation of the effects of a shifted sleep/wake schedule on the circadian expression of both peripheral circadian oscillators in PBMCs and centrally-driven hormonal rhythms. In light of evidence associating clock gene expression with tissue function, the study of peripheral circadian oscillators has important implications for understanding medical disorders affecting night shift workers.
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“Previous studies in both simulated (10, 11) and real-world (12, 13) shift work have shown that the rhythms of these circadian markers are resistant to phase shifting, indicating that the endogenous SCN rhythm is slow to adapt to shift work schedules.”
From Separation of circadian- and behavior-driven metabolite rhythms in humans provides a window on peripheral oscillators and metabolism (2018) · cites this paper as [11]
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Metadata
- Authors
- James, F. O., Cermakian, N., & Boivin, D. B.
- Affiliations
- Douglas Mental Health University Institute (CA)
- Corresponding author
- Boivin, Diane B.
- Venue
- Sleep
- Publisher
- Oxford University Press (OUP)
- Published
- 2007-11
- Volume
- 30
- Issue
- 11
- Pages
- 1427-1436
- ISSN
- 0161-8105 (ISSN-L)
- 1550-9109
- PMC
- PMC2082093
- OpenAlex
- W2122143410
- Cited by
- 135
- References
- 49
- Citations by year
- 2026: 5 · 2025: 4 · 2024: 8 · 2023: 6 · 2022: 6 · 2021: 8 · 2020: 7 · 2019: 11 · 2018: 8 · 2017: 7 · 2016: 8 · 2015: 2 · 2014: 9 · 2013: 10 · 2012: 11
- FWCI
- 2.72
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- SLEEP (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Transport Canada
- Servier
- Canadian Institutes of Health Research
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
- Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
- Keywords
- night shift work, circadian rhythm, melatonin, cortisol, clock gene expression, peripheral circadian oscillators, circadian adaptation, peripheral blood mononuclear cells, light exposure, shift work
- MeSH terms
- Adolescent, Adult, Circadian Rhythm, Employment, Female, Humans, Hydrocortisone, Leukocytes, Mononuclear, Light, Male, Melatonin, Wakefulness, Gene Expression, DNA Primers
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