| Circadian rhythm and light responsiveness of BMAL1 expression, a partner of mammalian clock gene Clock, in the suprachiasmatic nucleus of rats. | |
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MedLine Citation:
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PMID: 9875535 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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To clarify whether BMAL1 is involved in the photic signal transduction in the mammalian circadian clock, we examined the effects of a single light pulse on the level of BMAL1 mRNA in the suprachiasmatic nucleus (SCN) of rats by in situ hybridization. Rats were exposed to 30 min light of ca. 300 lux at six different phases in constant darkness and decapitated 60 min later. BMAL1 transcripts in the SCN of the control animals showed a robust circadian oscillation with the highest expression at ZT (Zeitgeber time) 18 and the lowest at ZT2. The light pulse slightly increased the level of BMAL1 transcripts in the SCN. However, the increment did not depend on the phase of light pulse. There was no significant change in the BMAL1 mRNA level up to 120 min after a light pulse at ZT14 and ZT22. These results indicate that BMAL1 transcription is not involved in the photic signal transduction responsible for non-parametric entrainment of the circadian clock in rats. |
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Authors:
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H Abe; S Honma; M Namihira; Y Tanahashi; M Ikeda; K Honma |
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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: Neuroscience letters Volume: 258 ISSN: 0304-3940 ISO Abbreviation: Neurosci. Lett. Publication Date: 1998 Dec |
Date Detail:
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Created Date: 1999-03-11 Completed Date: 1999-03-11 Revised Date: 2009-11-19 |
Medline Journal Info:
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Nlm Unique ID: 7600130 Medline TA: Neurosci Lett Country: IRELAND |
Other Details:
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Languages: eng Pagination: 93-6 Citation Subset: IM |
Affiliation:
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Department of Physiology, Hokkaido University School of Medicine, Sapporo, Japan. hiroabe@med.hokudai.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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ARNTL Transcription Factors Animals Basic Helix-Loop-Helix Transcription Factors Cerebral Cortex / metabolism Circadian Rhythm* Image Processing, Computer-Assisted In Situ Hybridization Light* Male Photoperiod RNA, Messenger / metabolism Rats Rats, Wistar Suprachiasmatic Nucleus / metabolism* Time Factors Transcription Factors / genetics* |
| Chemical | |
Reg. No./Substance:
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0/ARNTL Transcription Factors; 0/Basic Helix-Loop-Helix Transcription Factors; 0/RNA, Messenger; 0/Transcription Factors |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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