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• W2028121897 abstract "Hypocretin has been identified as a regulator of metabolic and endocrine systems. Several brain regions involved in the central regulation of autonomic and endocrine processes or attention are targets of extensive hypocretin projections. The most dense arborization of hypocretin axons in the brainstem was detected in the locus coeruleus (LC). Multiple labeling immunocytochemistry revealed a massive synaptic innervation of catecholaminergic LC cells by hypocretin axon terminals in rats and monkeys. In both species, all tyrosine hydroxylase-immunopositive cells in the LC examined by electron microscopy were found to receive asymmetrical (excitatory) synaptic contacts from multiple axons containing hypocretin. In parallel electrophysiological studies with slices of rat brain, all LC cells showed excitatory responses to the hypocretin-2 peptide. Hypocretin-2 uniformly increased the frequency of action potentials in these cells, even in the presence of tetrodotoxin, indicating that receptors responding to hypocretin were expressed in LC neurons. Two mechanisms for the increased firing rate appeared to be a reduction in the slow component of the afterhyperpolarization (AHP) and a modest depolarization. Catecholamine systems in other parts of the brain, including those found in the medulla, zona incerta, substantia nigra or olfactory bulb, received significantly less hypocretin input. Comparative analysis of lateral hypothalamic input to the LC revealed that hypocretin-containing axon terminals were substantially more abundant than those containing melanin-concentrating hormone. The present results provide evidence for direct action of hypothalamic hypocretin cells on the LC noradrenergic system in rats and monkeys. Our observations suggest a signaling pathway via which signals acting on the lateral hypothalamus may influence the activity of the LC and thereby a variety of CNSfunctions related to noradrenergic innervation, including vigilance, attention, learning, and memory. Thus, the hypocretin innervation of the LC may serve to focus cognitive processes to compliment hypocretin-mediated activation of autonomic centers already described. J. Comp. Neurol. 415:145–159, 1999. © 1999 Wiley-Liss, Inc." @default.
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• W2028121897 date "1999-12-13" @default.
• W2028121897 modified "2023-10-17" @default.
• W2028121897 title "Hypocretin (orexin) activation and synaptic innervation of the locus coeruleus noradrenergic system" @default.
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• W2028121897 doi "https://doi.org/10.1002/(sici)1096-9861(19991213)415:2<145::aid-cne1>3.0.co;2-2" @default.
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