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• W3136389921 abstract "Across sleep and wakefulness, brain function requires inter-neuronal interactions lasting beyond seconds. Yet, most studies of neural circuit connectivity focus on millisecond-scale interactions mediated by the classic fast transmitters, GABA and glutamate. In contrast, neural circuit roles of the largest transmitter family in the brain–the slow-acting peptide transmitters–remain relatively overlooked, or described as “modulatory.” Neuropeptides may efficiently implement sustained neural circuit connectivity, since they are not rapidly removed from the extracellular space, and their prolonged action does not require continuous presynaptic firing. From this perspective, we review actions of evolutionarily-conserved neuropeptides made by brain-wide-projecting hypothalamic neurons, focusing on lateral hypothalamus (LH) neuropeptides essential for stable consciousness: the orexins/hypocretins. Action potential-dependent orexin release inside and outside the hypothalamus evokes slow postsynaptic excitation. This excitation does not arise from modulation of classic neurotransmission, but involves direct action of orexins on their specific G-protein coupled receptors (GPCRs) coupled to ion channels. While millisecond-scale, GABA/glutamate connectivity within the LH may not be strong, re-assessing LH microcircuits from the peptidergic viewpoint is consistent with slow local microcircuits. The sustained actions of neuropeptides on neuronal membrane potential may enable core brain functions, such as temporal integration and the creation of lasting permissive signals that act as “eligibility traces” for context-dependent information routing and plasticity. The slowness of neuropeptides has unique advantages for efficient neuronal processing and feedback control of consciousness." @default.
• W3136389921 created "2021-03-29" @default.
• W3136389921 creator A5031535677 @default.
• W3136389921 creator A5058990653 @default.
• W3136389921 date "2021-03-11" @default.
• W3136389921 modified "2023-10-16" @default.
• W3136389921 title "Neuropeptides as Primary Mediators of Brain Circuit Connectivity" @default.
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• W3136389921 doi "https://doi.org/10.3389/fnins.2021.644313" @default.
• W3136389921 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7991401" @default.
• W3136389921 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33776641" @default.
• W3136389921 hasPublicationYear "2021" @default.
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