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Orexin-A (hypocretin-1), a neuropeptide with stimulatory actions on arousal and appetite, was originally shown to be specifically expressed in the hypothalamus. We studied expression of orexin-A and orexin receptors in the kidney and the presence of orexin-A-like immunoreactivity in human urine. Immunocytochemistry showed that orexin-A-like immunoreactivity and two types of orexin receptors (types...
Orexins are neuropeptides that are mostly expressed in the posterior and lateral hypothalamus, and related to the central control of appetite, arousal, and antinociception. Orexin neurons projected to the tuberomammillary nucleus and orexins may release histamine from the histamine neurons in this nucleus. Histamine is known to cause hypernociception. The roles of histamine H1 and H2 receptors in...
Orexin-A (hypocretin-1), a neuropeptide produced in hypothalamus, stimulates arousal. We studied plasma concentrations of orexin-A-like immunoreactivity (orexin-A-LI) in 156 patients with sleep apnea hypopnea syndrome (SAHS) and 22 control subjects. Plasma orexin-A-LI levels were significantly decreased in 156 patients with SAHS (4.4±0.15pmol/l, mean±S.E.) as compared with controls (5.3±0.45pmol/l)...
Regional distribution of orexin-A-like immunoreactivity in the human brain and pituitary, and the presence of orexin-A-like immunoreactivity in the tumor tissues of pheochromocytomas, ganglioneuroblastomas and neuroblastomas were studied by radioimmunoassay. Expression of orexin mRNA was studied by reverse transcriptase polymerase chain reaction (PCR) method. Orexin-A-like immunoreactivity was detected...
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