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Stress affects expression of the clock gene Bmal1 in the suprachiasmatic nucleus of neonatal rats via glucocorticoid‐dependent mechanism
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SYSNO ASEP 0489285 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Stress affects expression of the clock gene Bmal1 in the suprachiasmatic nucleus of neonatal rats via glucocorticoid‐dependent mechanism Author(s) Olejníková, Lucie (FGU-C)
Polidarová, Lenka (FGU-C) RID, ORCID
Sumová, Alena (FGU-C) RID, ORCIDArticle number e13020 Source Title Acta Physiologica. - : Wiley - ISSN 1748-1708
Roč. 223, č. 1 (2018)Number of pages 15 s. Language eng - English Country US - United States Keywords clock genes ; development ; glucocorticoids ; mifepristone ; restricted feeding ; stress ; suprachiasmatic nuclei Subject RIV ED - Physiology OECD category Physiology (including cytology) R&D Projects GA16-03932S GA ČR - Czech Science Foundation (CSF) Institutional support FGU-C - RVO:67985823 UT WOS 000429694100003 EID SCOPUS 85040675043 DOI 10.1111/apha.13020 Annotation The reactivity of the circadian clock in the suprachiasmatic nuclei (SCN) to stressful stimuli has been controversial but most studies have confirmed the resilience of the SCN to stress. We tested the hypothesis that during a critical period shortly after birth, the developing SCN clock is affected by glucocorticoids. Mothers of 2 rat strains with different sensitivities to stress, that is Wistar rats and spontaneously hypertensive rats (SHR), and their pups were exposed to stressful stimuli every day from delivery, and clock gene expression profiles were detected in the 4‐day‐old pups’ SCN. Levels of glucocorticoids in plasma were measured by LC‐MS/MS. The glucocorticoid receptors antagonist mifepristone was administered to pups to block the effect of the glucocorticoids. The glucocorticoid receptors were detected at the mRNA and protein levels in the SCN of 4‐day‐old pups. The exposure of mothers to stressful stimuli elevated their plasma glucocorticoid levels. In Wistar rat pups, combination of daily maternal stress with their manipulation increased the plasma glucocorticoid levels and shifted the Bmal1 rhythm in the SCN which was completely blocked by mifepristone. In contrast, in SHR pups, maternal stress on its own caused phase shift of the Bmal1 expression rhythm in the SCN but the effect was mediated via glucocorticoid‐independent mechanism. The Per1 and Per2 expression profiles remained phase‐locked to the light/dark cycle. The results demonstrate that the SCN is sensitive to stressful stimuli early after birth in pups maintained under light/dark conditions and the effect is mediated via glucocorticoid‐dependent pathways. Workplace Institute of Physiology Contact Lucie Trajhanová, lucie.trajhanova@fgu.cas.cz, Tel.: 241 062 400 Year of Publishing 2019
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