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- W2207347178 abstract "Orexins/hypocretins are two neuropeptides that influence many behaviours, such as feeding, sleep or arousal. Orexin A/hypocretin-1 (OXA) and orexin B/hypocretin-2 (OXB) bind to two metabotropic receptors, named the OX1 and OX2 receptors. The lateral geniculate complex of the thalamus is one of the many targets of orexinergic fibres derived from the lateral hypothalamus, although the impact of orexins on the ventrolateral geniculate nucleus (VLG) is poorly understood. The VLG, an important relay station of the subcortical visual system, is implicated in visuomotor and/or circadian processes. Therefore, in this study we evaluated the effects of orexins on single VLG neurons using a patch-clamp technique in vitro. Surprisingly, orexins depolarised the majority of the recorded neurons regardless of their localisation in the borders of the VLG. In addition, data presented in this article show that neurons synthesising NO were also affected by OXA. Moreover, immunohistochemical staining of OXB revealed the moderate density of orexinergic fibbers in the VLG. Our study using specific orexin receptor antagonists suggests that the OX2 receptor has a dominant role in the observed effects of OXA. To our knowledge, this article is the first to show orexinergic modulation of the VLG. These findings strengthen the postulated link between orexins and the circadian system, and propose a new role of these neuropeptides in the modulation of visuomotor functions." @default.
- W2207347178 created "2016-06-24" @default.
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- W2207347178 date "2016-04-01" @default.
- W2207347178 modified "2023-10-16" @default.
- W2207347178 title "Orexins excite ventrolateral geniculate nucleus neurons predominantly via OX2 receptors" @default.
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- W2207347178 doi "https://doi.org/10.1016/j.neuropharm.2015.12.008" @default.
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