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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Haraguchi, Shogo Hatori, Megumi Hirota, Tsuyoshi Iitsuka, Michiko Sato, Ryuichiro Tsutsui, Kazuyoshi Nakai, Akira Fukada, Yoshitaka Kurabayashi, Nobuhiro Kokame, Koichi Miyata, Toshiyuki |
| Description | Author Affiliation: Hatori M ( Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan.); |
| Abstract | The circadian clock is phase-delayed or -advanced by light when given at early or late subjective night, respectively. Despite the importance of the time-of-day-dependent phase responses to light, the underlying molecular mechanism is poorly understood. Here, we performed a comprehensive analysis of light-inducible genes in the chicken pineal gland, which consists of light-sensitive clock cells representing a prototype of the clock system. Light stimulated expression of 62 genes and 40 ESTs by >2.5-fold, among which genes responsive to the heat shock and endoplasmic reticulum stress as well as their regulatory transcription factors heat shock factor (HSF)1, HSF2, and X-box-binding protein 1 (XBP1) were strongly activated when a light pulse was given at late subjective night. In contrast, the light pulse at early subjective night caused prominent induction of E4bp4, a key regulator in the phase-delaying mechanism of the pineal clock, along with activation of a large group of cholesterol biosynthetic genes that are targets of sterol regulatory element-binding protein (SREBP) transcription factor. We found that the light pulse stimulated proteolytic formation of active SREBP-1 that, in turn, transactivated E4bp4 expression, linking SREBP with the light-input pathway of the pineal clock. As an output of light activation of cholesterol biosynthetic genes, we found light-stimulated pineal production of a neurosteroid, 7 -hydroxypregnenolone, demonstrating a unique endocrine function of the pineal gland. Intracerebroventricular injection of 7 -hydroxypregnenolone activated locomotor activities of chicks. Our study on the genome-wide gene expression analysis revealed time-of-day-dependent light activation of signaling pathways and provided molecular connection between gene expression and behavior through neurosteroid release from the pineal gland. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 12 |
| Volume Number | 108 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2011-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Circadian Rhythm Physiology DNA-Binding Proteins Metabolism Gene Expression Regulation Heat-Shock Proteins Signal Transduction Sterol Regulatory Element Binding Protein 1 Transcription Factors 17-alpha-Hydroxypregnenolone Analogs & Derivatives Pharmacology Animals Behavior, Animal Drug Effects Radiation Effects Cholesterol Biosynthesis Endoplasmic Reticulum Genome-Wide Association Study Locomotion Molecular Sequence Data Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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