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Seasonal remodeling of the progenitor pool and its distribution in the ewe mediobasal hypothalamus

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Abstract

Recent studies have reported the presence of adult neurogenesis in the arcuate nucleus periventricular space (pvARH) and in the median eminence (ME), two structures involved in reproductive function. In sheep, a seasonal mammal, decreasing daylight in autumn induces a higher neurogenic activity in these two structures. However, the different types of neural stem and progenitor cells (NSCs/NPCs) that populate the arcuate nucleus and median eminence, as well as their location, have not been evaluated. Here, using semi-automatic image analyzing processes, we identified and quantified the different populations of NSCs/NPCs, showing that, during short days, higher densities of [SOX2 +] cells are found in pvARH and ME. In the pvARH, higher densities of astrocytic and oligodendrocitic progenitors mainly contribute to these variations. The different populations of NSCs/NPCs were mapped according to their position relative to the third ventricle and their proximity to the vasculature. We showed that [SOX2 +] cells extended deeper into the hypothalamic parenchyma during short days. Similarly, [SOX2 +] cells were found further from the vasculature in the pvARH and the ME, at this time of year, indicating the existence of migratory signals. The expression levels of neuregulin transcripts (NRGs), whose proteins are known to stimulate proliferation and adult neurogenesis and to regulate progenitor migration, as well as the expression levels of ERBB mRNAs, cognate receptors for NRGs, were assessed. We showed that mRNA expression changed seasonally in pvARH and ME, suggesting that the ErbB-NRG system is potentially involved in the photoperiodic regulation of neurogenesis in seasonal adult mammals.

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Abbreviations

ARH:

Arcuate nucleus

LP:

Long photoperiod

MBH:

Mediobasal hypothalamus

ME:

Median eminence

NRGs:

Neuregulins

NSCs/NPCs:

Neural stem and progenitor cells

NSCs:

Neural stem cells

pvARH:

Periventricular space of the arcuate nucleus

[SOX2-HuC/D +]:

Cells immunonegative for SOX2 and immunopositive for HuC/D

[SOX2-Olig2 +]:

Cells immunonegative for SOX2 and immunopositive for Olig2

[SOX2 +] cells:

Neural stem and progenitor cells expressing SOX2

[SOX2 + HuC/D +]:

SOX2 + population densities that co-express HuC/D identifying neuron progenitor cells

[SOX2 + Olig2 +]:

SOX2 + population densities that co-express Olig2 identifying neoligodendrocyte progenitor cells

[SOX2 + S100 +]:

SOX2 + population densities that co-express S100 identifying astrocyte progenitor cells

[SOX2-S100 +]:

Cells immunonegative for SOX2 and immunopositive for S100

SGZ:

Subgranular zone of the hippocampal dentate gyrus

SP:

Short photoperiod

SVZ:

Subventricular zone of the lateral ventricles

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Acknowledgements

The authors thank the PAO experimental unit No. 1297 (EU0028; INRAE Val de Loire) for taking care of the animals.

Funding

This work was funded by the Agence Nationale de la Recherche ANR-16-CE37-0006 (to Martine Migaud). Pierre-Marie Chevillard received a grant from The Ministry of Higher Education, Research and Innovation (MESRI).

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Correspondence to Martine Migaud.

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This article does not contain any studies with human participants. Animals were handled and cared for in accordance with the EC Directive of 24 November 1986 (86/609/EEC) and with authorization A37110 from the French Ministry of Agriculture. All procedures were approved by the Regional Ethics Committee (Comité Régional d’Ethique pour l’Expérimentation Animale, Centre-Limousin region (CREEA)).

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The authors declare no competing interests.

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Chevillard, PM., Batailler, M., Dubois, JP. et al. Seasonal remodeling of the progenitor pool and its distribution in the ewe mediobasal hypothalamus. Cell Tissue Res 392, 745–761 (2023). https://doi.org/10.1007/s00441-023-03745-x

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