Stress-Induced Changes in the Expression of the Clock Protein PERIOD1 in the Rat Limbic Forebrain and Hypothalamus: Role of Stress Type, Time of Day, and Predictability
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Stressful events can disrupt circadian rhythms in mammals but mechanisms underlying this disruption remain largely unknown. One hypothesis is that stress alters circadian protein expression in the forebrain, leading to functional dysregulation of the brain circadian network and consequent disruption of circadian physiological and behavioral rhythms. Here we characterized the effects of several different stressors on the expression of the core clock protein, PER1 and the activity marker, FOS in select forebrain and hypothalamic nuclei in rats. We found that acute exposure to processive stressors, restraint and forced swim, elevated PER1 and FOS expression in the paraventricular and dorsomedial hypothalamic nuclei and piriform cortex but suppressed PER1 and FOS levels exclusively in the central nucleus of the amygdala (CEAl) and oval nucleus of the bed nucleus of the stria terminalis (BNSTov). Conversely, systemic stressors, interleukin-1β and 2-Deoxy-D-glucose, increased PER1 and FOS levels in all regions studied, including the CEAl and BNSTov. PER1 levels in the suprachiasmatic nucleus (SCN), the master pacemaker, were unaffected by any of the stress manipulations. The effect of stress on PER1 and FOS was modulated by time of day and, in the case of daily restraint, by predictability. These results demonstrate that the expression of PER1 in the forebrain is modulated by stress, consistent with the hypothesis that PER1 serves as a link between stress and the brain circadian network. Furthermore, the results show that the mechanisms that control PER1 and FOS expression in CEAl and BNSTov are uniquely sensitive to differences in the type of stressor. Finally, the finding that the effect of stress on PER1 parallels its effect on FOS supports the idea that Per1 functions as an immediate-early gene. Our observations point to a novel role for PER1 as a key player in the interface between stress and circadian rhythms.
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Forced activity does not affect the clock in the suprachiasmatic nucleus.
“This finding is consistent with work indicating that FA does not affect the clock in the suprachiasmatic nucleus (25).”
From Oxalic acid and diacylglycerol 36:3 are cross-species markers of sleep debt (2015) · cites this paper as [25]
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Glucocorticoids and Stress-Induced Changes in the Expression of PERIOD1 in the Rat
Al-Safadi, S., Branchaud, M., Rutherford, S., & Amir, S. (2015)
Self-citationOpiol, H. (2019) · Spectrum Research Repository (Concordia University)
(2018) · Elsevier eBooks · doi:10.1016/b978-0-12-811351-6.00026-7
Daily Rhythms in Clock Gene mRNA Expression in Serotonergic Brain Regions of Adult Male Rats
Strnad, H. K., & Spencer, R. L. (2026) · Journal of Biological Rhythms · doi:10.1177/07487304261427042
- Authors
- Al-Safadi, S., Al-Safadi, A., Branchaud, M., Rutherford, S., Dayanandan, A., Robinson, B., & Amir, S.
- Affiliations
- Concordia University (CA)
- Corresponding author
- Al-Safadi, Sherin
- Al-Safadi, Aya
- Branchaud, Marie
- Rutherford, Spencer
- Dayanandan, Arun
- Robinson, Barry
- Amir, Shimon
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2014-10-22
- Volume
- 9
- Issue
- 10
- Pages
- e111166
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC4206498
- OpenAlex
- W2076665414
- Cited by
- 31
- References
- 79
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2021: 3 · 2019: 3 · 2018: 4 · 2017: 6 · 2016: 4 · 2015: 7
- FWCI
- 2.76
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Spectrum Research Repository (Concordia University) (acceptedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Concordia University
- Natural Sciences and Engineering Research Council of Canada
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
- Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
- Keywords
- Per1, circadian rhythm, stress, clock genes, FOS, limbic forebrain, hypothalamus, central amygdala, bed nucleus of the stria terminalis, suprachiasmatic nucleus, restraint stress, forced swim test, IL-1β, 2-deoxyglucose, time of day, immediate early genes
- MeSH terms
- Animals, Corticosterone, Gene Expression Regulation, Hypothalamus, Male, Septal Nuclei, Stress, Physiological, Time Factors, Prosencephalon, Proto-Oncogene Proteins c-fos, Rats, Period Circadian Proteins
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