| Constant light housing attenuates circadian rhythms of mPer2 mRNA and mPER2 protein expression in the suprachiasmatic nucleus of mice. | |
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MedLine Citation:
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PMID: 14522008 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Constant light (LL) or constant dark (DD) environmental lighting conditions cause a free-running period and activity reduction in the rodent behavioral circadian rhythm. In order to understand the molecular process underlying behavioral rhythms in LL or DD housing conditions, we examined the circadian profile of mPer2 mRNA and mPER2 in the suprachiasmatic nucleus (SCN), a main oscillator, of free-running mice. The circadian expression rhythm of mPer2 in the SCN was dampened under 7-day LL conditions, whereas that of mPER2 protein was moderately attenuated and its expression peak delayed. The circadian expression of mPer2 and its product was slightly attenuated and advanced by 7-day DD conditions. With arrhythmic behavioral activity caused by long-term LL housing, mPER2 protein lost its rhythmicity in the SCN. On the other hand, LL or DD housing did not affect the mPer2 gene and its product in the cerebral cortex. The present results suggest that mPER2 circadian expression in the SCN corresponds well with behavioral circadian oscillation under LL or DD conditions. Thus, the behavioral circadian rhythm seems to correlate with molecular clock works in the SCN. |
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Authors:
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M Sudo; K Sasahara; T Moriya; M Akiyama; T Hamada; S Shibata |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Neuroscience Volume: 121 ISSN: 0306-4522 ISO Abbreviation: Neuroscience Publication Date: 2003 |
Date Detail:
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Created Date: 2003-10-02 Completed Date: 2003-12-19 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 7605074 Medline TA: Neuroscience Country: United States |
Other Details:
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Languages: eng Pagination: 493-9 Citation Subset: IM |
Affiliation:
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Department of Pharmacology and Brain Science, School of Human Sciences, Waseda University, Tokorozawa, Saitama 359-1164, Japan. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Analysis of Variance Animals Cell Cycle Proteins Cerebral Cortex / metabolism, radiation effects Circadian Rhythm / physiology, radiation effects* Darkness Gene Expression Regulation / radiation effects* Immunohistochemistry In Situ Hybridization Light* Male Mice Mice, Inbred BALB C Motor Activity / physiology, radiation effects Nuclear Proteins / genetics, metabolism* Period Circadian Proteins RNA, Messenger / metabolism Suprachiasmatic Nucleus / anatomy & histology, metabolism, radiation effects* Time Factors Transcription Factors |
| Chemical | |
Reg. No./Substance:
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0/Cell Cycle Proteins; 0/Nuclear Proteins; 0/Per2 protein, mouse; 0/Per3 protein, mouse; 0/Period Circadian Proteins; 0/RNA, Messenger; 0/Transcription Factors |
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