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Furthermore, our previous studies showed that histamine N-methyltransferase (HNMT), a histamine-metabolizing enzyme, is important for regulating brain histamine concentration. However, the effects of pharmacological HNMT inhibition on mouse behavior, including the sleep\u2013wake cycle and cataplexy, in a mouse model of narcolepsy have not yet been investigated. In the present study, we investigated the effects of metoprine, an HNMT inhibitor with high blood-brain barrier permeability, in wild-type (WT) and orexin-deficient (OxKO) narcoleptic mice. Metoprine increased brain histamine concentration in a time- and dose-dependent manner without affecting peripheral histamine concentrations. Behavioral tests showed that metoprine increased locomotor activity in both novel and familiar environments, but did not alter anxiety-like behavior. Sleep analysis showed that metoprine increased wakefulness and decreased non-rapid eye movement (NREM) sleep through the activation of the histamine H1 receptor (H1R) in WT mice. In contrast, the reduction of rapid eye movement (REM) sleep by metoprine occurred independent of H1R. In OxKO mice, metoprine was found to prolong wakefulness and robustly suppress cataplexy. In addition, metoprine has a greater therapeutic effect on cataplexy than pitolisant, which induces histamine release in the brain and has been approved for patients with narcolepsy. These data demonstrate that HNMT inhibition has a strong effect on wakefulness, demonstrating therapeutic potential against cataplexy in narcolepsy.<\/jats:p>","DOI":"10.1093\/sleep\/zsae244","type":"journal-article","created":{"date-parts":[[2024,10,23]],"date-time":"2024-10-23T15:03:49Z","timestamp":1729695829000},"source":"Crossref","is-referenced-by-count":5,"title":["Pharmacological inhibition of histamine <i>N<\/i>-methyltransferase extends wakefulness and suppresses cataplexy in a mouse model of narcolepsy"],"prefix":"10.1093","volume":"48","author":[{"given":"Fumito","family":"Naganuma","sequence":"first","affiliation":[{"name":"Department of Neuropharmacology, Hokkaido University Graduate School of Medicine , Hokkaido ,","place":["Japan"]},{"name":"Department of Pharmacology, Tohoku University Graduate School of Medicine , Miyagi ,","place":["Japan"]},{"name":"Division of Pharmacology, Faculty of Medicine, Tohoku Medical and Pharmaceutical University , Miyagi 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