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Perry Barrett Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Elena Ivanova Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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E Scott Graham Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Alexander W Ross Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Dana Wilson Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Helene Plé Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Julian G Mercer Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Francis J Ebling Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Sandrine Schuhler Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Sandrine M Dupré Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Andrew Loudon Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Peter J Morgan Molecular Endocrinology Group, Division of Obesity and Metabolic Health and Aberdeen Centre for Energy Regulation and Obesity (ACERO), Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB21 9SB, UK
Faculty of Life Sciences, University of Manchester, Stopford Building, Oxford Road, Manchester M13 9PT, UK
School of Biomedical Sciences, University of Nottingham Medical School, Nottingham NG7 2UH, UK

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Tanycytes in the ependymal layer of the third ventricle act both as a barrier and a communication gateway between the cerebrospinal fluid, brain and portal blood supply to the pituitary gland. However, the range, importance and mechanisms involved in the function of tanycytes remain to be explored. In this study, we have utilized a photoperiodic animal to examine the expression of three unrelated gene sequences in relation to photoperiod-induced changes in seasonal physiology and behaviour. We demonstrate that cellular retinoic acid-binding protein 1 (CRBP1), a retinoic acid transport protein, GPR50, an orphan G-protein-coupled receptor and nestin, an intermediate filament protein, are down-regulated in short-day photoperiods. The distribution of the three sequences is very similar, with expression located in cells with tanycyte morphology in the region of the ependymal layer where tanycytes are located. Furthermore, CRBP1 expression in the ependymal layer is shown to be independent of a circadian clock and altered testosterone levels associated with testicular regression in short photo-period. Pinealectomy of Siberian hamsters demonstrates CRBP1 expression is likely to be dependent on melatonin output from the pineal gland. This provides evidence that tanycytes are seasonally responsive cells and are likely to be an important part of the mechanism to facilitate seasonal physiology and behaviour in the Siberian hamster.

Article Type:
Research Article
DOI:
https://doi.org/10.1677/joe.1.06929
Volume/Issue:
Volume 191: Issue 3
Free access
Perry Barrett
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Elena Ivanova
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E Scott Graham
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Alexander W Ross
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Dana Wilson
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Helene Plé
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Julian G Mercer
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Francis J Ebling
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Sandrine Schuhler
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Sandrine M Dupré
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Andrew Loudon
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Peter J Morgan
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Article Type:
Addendum
DOI:
https://doi.org/10.1677/joe.1.06929e
Volume/Issue:
Volume 203: Issue 2
Free access