| A c-fos-monomeric red fluorescent protein 1 fusion transgene is differentially expressed in rat forebrain and brainstem after chronic dehydration and rehydration. | |
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MedLine Citation:
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PMID: 23350545 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We have previously shown that an acute osmotic stimulation induces the expression of a c-fos and monomeric red fluorescent protein 1 (mRFP1) fusion transgene in osmosensitive rat brain areas, including the supraoptic (SON) and paraventricular nuclei (PVN). However, the effects of chronic stimuli, such as dehydration, have not been investigated. In the present study, the expression patterns of the c-fos-mRFP1 fusion gene in the forebrain and the brainstem of male and female transgenic rats were studied in seven experimental groups - ad libitum water (euhydration), water deprivation for 12 h, 24 h or 48 h (dehydration) and water deprivation for 46 h plus ad libitum water for 2 h, 6 h or 12 h (rehydration). The number of cells that express nuclear mRFP1 fluorescence was quantified in the hypothalamus, the circumventricular organs and the brainstem. Compared to the euhydrated state, the number of transgene expressing cells significantly increased in all forebrain areas and in the rostral ventrolateral medulla after dehydration and 2 h rehydration. In the nucleus of the solitary tract and area postrema, the number of mRFP1 fluorescent cells was markedly increased after 2 h rehydration. Although the number of mRFP1 fluorescent cells in the organum vasculosum laminae terminalis, median preoptic nucleus and subfornical organ remained significantly increased after 6 h rehydration, reaching control levels after 12 h of rehydration, the number of mRFP1 fluorescent cells in the SON and the PVN reached control levels after 6 h rehydration. There were no significant differences between male and female rats. These results show that the expression of the c-fos-mRFP1 fusion gene changes in the forebrain and the brainstem not only after acute osmotic stimulation, but also chronic osmotic stimulation. Interestingly, these studies reveal differential activation of different neuronal groups over the time course of dehydration and rehydration. © 2013 British Society for Neuroendocrinology. |
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Authors:
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Mitsuhiro Yoshimura; Junichi Okubo; Akiko Katoh; Motoko Ohno; Toru Ishikura; Tetsuya Kakuma; Hironobu Yoshimatsu; David Murphy; Yoichi Ueta |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2013-1-27 |
Journal Detail:
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Title: Journal of neuroendocrinology Volume: - ISSN: 1365-2826 ISO Abbreviation: J. Neuroendocrinol. Publication Date: 2013 Jan |
Date Detail:
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Created Date: 2013-1-28 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8913461 Medline TA: J Neuroendocrinol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© 2013 British Society for Neuroendocrinology. |
Affiliation:
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Department of Physiology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, 807-8555, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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