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Published in: Brain Structure and Function 6/2016

01-07-2016 | Original Article

Sensitivity to the photoperiod and potential migratory features of neuroblasts in the adult sheep hypothalamus

Authors: Martine Batailler, Laura Derouet, Lucile Butruille, Martine Migaud

Published in: Brain Structure and Function | Issue 6/2016

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Abstract

Adult neurogenesis, a process that consists in the generation of new neurons from adult neural stem cells, represents a remarkable illustration of the brain structural plasticity abilities. The hypothalamus, a brain region that plays a key role in the neuroendocrine regulations including reproduction, metabolism or food intake, houses neural stem cells located within a hypothalamic neurogenic niche. In adult sheep, a seasonal mammalian species, previous recent studies have revealed photoperiod-dependent changes in the hypothalamic cell proliferation rate. In addition, doublecortin (DCX), a microtubule-associated protein expressed in immature migrating neurons, is highly present in the vicinity of the hypothalamic neurogenic niche. With the aim to further explore the mechanism underlying adult sheep hypothalamic neurogenesis, we first show that new neuron production is also seasonally regulated since the density of DCX-positive cells changes according to the photoperiodic conditions at various time points of the year. We then demonstrate that cyclin-dependant kinase-5 (Cdk5) and p35, two proteins involved in DCX phosphorylation and known to be critically involved in migration processes, are co-expressed with DCX in young hypothalamic neurons and are capable of in vivo interaction. Finally, to examine the migratory potential of these adult-born neurons, we reveal the rostro-caudal extent of DCX labeling on hypothalamic sagittal planes. DCX-positive cells are found in the most rostral nuclei of the hypothalamus, including the preoptic area many of which co-expressed estrogen receptor-α. Thus, beyond the confirmation of the high level of neuron production during short photoperiod in sheep, our results bring new and compelling elements in support of the existence of a hypothalamic migratory path that is responsive to seasonal stimuli.
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Metadata
Title
Sensitivity to the photoperiod and potential migratory features of neuroblasts in the adult sheep hypothalamus
Authors
Martine Batailler
Laura Derouet
Lucile Butruille
Martine Migaud
Publication date
01-07-2016
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function / Issue 6/2016
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-015-1101-0

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