| Exposure of pregnant rats to restricted feeding schedule synchronizes the SCN clocks of their fetuses under constant light but not under a light-dark regime. | |
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MedLine Citation:
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PMID: 20876815 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The circadian clock in the suprachiasmatic nucleus (SCN) develops gradually during the prenatal and early postnatal period. In the rat, this period lasts from around the 15th day of gestation until the 10th day of postnatal development. The circadian system of fetuses and newborn pups is entrained mostly by nonphotic maternal cues during prenatal and early postnatal development. The aim of the present study was to ascertain whether exposure of pregnant rats to a restricted feeding (RF) regime was able to entrain the circadian clock in the SCN of their fetuses during the prenatal period. The potency of RF as an entraining cue was tested under conditions when pregnant rats were entrained to an external light/dark (LD) cycle as well as under conditions when the external timing signal was lacking, i.e., under constant light (LL). The control groups were fed ad libitum and the experimental groups had restricted access to food for 6 h during their resting time throughout pregnancy. Daily profiles of Avp and c-fos gene expression were examined by in situ hybridization in the SCN of 1-day-old pups. The data demonstrated that RF in pregnant rats kept under LD cycle did not notably affect the daily rhythms of c-fos and Avp expression in the SCN of pups. The SCN profiles of Avp and c-fos gene expression did not exhibit circadian rhythms in pups born to mothers maintained in LL and fed ad libitum, likely due to desynchrony among the pups within a litter. However, RF in the pregnant rats kept under LL restored the circadian rhythmicity of c-fos and Avp expression in the SCN of their newborn pups. The results suggest that the fetal SCN clock is dominantly entrained by rhythmic signals from the maternal SCN. However, under conditions when the rhythmic signaling might be lacking, such as LL, regular food intake of the mothers may also play an important role in synchronization of the fetal SCN clock during prenatal ontogenesis. |
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Authors:
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Marta Nováková; Martin Sládek; Alena Sumová |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of biological rhythms Volume: 25 ISSN: 1552-4531 ISO Abbreviation: J. Biol. Rhythms Publication Date: 2010 Oct |
Date Detail:
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Created Date: 2010-09-29 Completed Date: 2011-01-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8700115 Medline TA: J Biol Rhythms Country: United States |
Other Details:
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Languages: eng Pagination: 350-60 Citation Subset: IM |
Affiliation:
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Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Arginine Vasopressin / genetics, metabolism Biological Clocks / physiology* Circadian Rhythm / physiology* Eating* Female Fetus / anatomy & histology, physiology* Light* Motor Activity / physiology Photoperiod* Pregnancy Proto-Oncogene Proteins c-fos / genetics, metabolism Rats Suprachiasmatic Nucleus / embryology, growth & development, metabolism |
| Chemical | |
Reg. No./Substance:
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0/Proto-Oncogene Proteins c-fos; 113-79-1/Arginine Vasopressin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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