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• W2610576732 abstract "Pulsatile secretion of gonadotrophin-releasing hormone (GnRH)/luteinising hormone is indispensable for the onset of puberty and reproductive activities at adulthood in mammalian species. A cohort of neurones expressing three neuropeptides, namely kisspeptin, encoded by the Kiss1 gene, neurokinin B (NKB) and dynorphin A, localised in the hypothalamic arcuate nucleus (ARC), so-called KNDy neurones, comprises a putative intrinsic source of the GnRH pulse generator. Synchronous activity among KNDy neurones is considered to be required for pulsatile GnRH secretion. It has been reported that gap junctions play a key role in synchronising electrical activity in the central nervous system. Thus, we hypothesised that gap junctions are involved in the synchronised activities of KNDy neurones, which is induced by NKB-NK3R signalling. We determined the role of NKB-NK3R signalling in Ca2+ oscillation (an indicator of neuronal activities) of KNDy neurones and its synchronisation mechanism among KNDy neurones. Senktide, a selective agonist for NK3R, increased the frequency of Ca2+ oscillations in cultured Kiss1-GFP cells collected from the mediobasal hypothalamus of the foetal Kiss1-green fluorescent protein (GFP) mice. The senktide-induced Ca2+ oscillations were synchronised in the Kiss1-GFP and neighbouring glial cells. Confocal microscopy analysis of these cells, which have shown synchronised Ca2+ oscillations, revealed close contacts between Kiss1-GFP cells, as well as between Kiss1-GFP cells and glial cells. Dye coupling experiments suggest cell-to-cell communication through gap junctions between Kiss1-GFP cells and neighbouring glial cells. Connexin-26 and -37 mRNA were found in isolated ARC Kiss1 cells taken from adult female Kiss1-GFP transgenic mice. Furthermore, 18β-glycyrrhetinic acids and mefloquine, which are gap junction inhibitors, attenuated senktide-induced Ca2+ oscillations in Kiss1-GFP cells. Taken together, these results suggest that NKB-NK3R signalling enhances synchronised activities among neighbouring KNDy neurones, and that both neurone-neurone and neurone-glia communications via gap junctions possibly contribute to synchronised activities among KNDy neurones." @default.
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• W2610576732 date "2017-06-01" @default.
• W2610576732 modified "2023-10-14" @default.
• W2610576732 title "Evidence of involvement of neurone-glia/neurone-neurone communications via gap junctions in synchronised activity of KNDy neurones" @default.
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• W2610576732 doi "https://doi.org/10.1111/jne.12480" @default.
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