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Erschienen in: Brain Structure and Function 1/2018

01.01.2018 | Original Article

Seasonal reorganization of hypothalamic neurogenic niche in adult sheep

verfasst von: Lucile Butruille, Martine Batailler, Danièle Mazur, Vincent Prévot, Martine Migaud

Erschienen in: Brain Structure and Function | Ausgabe 1/2018

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Abstract

Neurogenesis is the process by which new neurons are generated. This process, well established during development, persists in adulthood owing to the presence of neural stem cells (NSCs) localized in specific brain areas called neurogenic niches. Adult neurogenesis has recently been shown to occur in the hypothalamus, a structure involved in the neuroendocrine regulation of reproduction and metabolism, among others. In the adult sheep—a long-lived mammalian model—we have previously reported the existence of such a neurogenic niche located in the hypothalamic arcuate nucleus and the median eminence. In addition, in this seasonal species, the proliferation as well as neuroblasts production varies depending on the time of the year. In the present study, we provide a better characterization of the hypothalamic neurogenic niche by identifying the main components (NSCs, migrating cells, glial cells and blood vessels) using immunohistochemistry for validated markers. Then, we demonstrate the strong sensitivity of these various neurogenic niche components to the season, particularly in the arcuate nucleus. Further, using an electron microscopic approach, we reveal the cellular and cytoarchitectural reorganization of the arcuate nucleus niche following exposure to contrasting seasons. This study provides evidence that the arcuate nucleus and the median eminence contain two independent niches that react differently to the season. In addition, our results support the view that the cytoarchitectural organization of the sheep arcuate nucleus share comparable features with the structure of the subventricular zone in humans and non-human primates.
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Metadaten
Titel
Seasonal reorganization of hypothalamic neurogenic niche in adult sheep
verfasst von
Lucile Butruille
Martine Batailler
Danièle Mazur
Vincent Prévot
Martine Migaud
Publikationsdatum
01.01.2018
Verlag
Springer Berlin Heidelberg
Erschienen in
Brain Structure and Function / Ausgabe 1/2018
Print ISSN: 1863-2653
Elektronische ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-017-1478-z

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