title: Changes in emotional behavior of mice in the hole-board test after olfactory bulbectomy.
abstract: The most consistent behavioral change caused by olfactory bulbectomy (OBX) is a hyperemotional response to novel environmental stimuli. The aim of this study was to characterize the emotional behavior of OBX mice using the hole-board test. After the olfactory bulbs were lesioned, sham and OBX mice were housed in single cages for 14 days. The number of head-dips in the hole-board test in single-housed OBX mice was significantly greater than that in single-housed sham mice. The head-dipping behaviors in single-housed sham and OBX mice were reversed by treatment with diazepam, a typical benzodiazepine anxiolytic. (+/-)-8-Hydroxy-2-(di-n-propylamino) tetraline hydrobromide (8-OH-DPAT), a selective 5-HT(1A)-receptor agonist that has a non-benzodiazepine anxiolytic-like effect, and (+)-4-[(aR)-a-((2S,5R)-4-allyl-2,5-dimethyl-1-piperazinyl)-3-methoxybenzyl]-N,N-diethyl benzamide (SNC80), a delta-opioid-receptor agonist, also significantly reversed the number of head-dips in single-housed sham and OBX mice. In conclusion, we suggest that the single-housed OBX mice showed heightened emotional behavior (e.g., increase in head-dipping behavior) in the hole-board test. In addition, we suggest that the hyperemotional behavior characterized by head-dipping behavior in OBX mice was selectively reversed by benzodiazepine and non-benzodiazepine anxiolytics.
authors.affiliation: Department of Pathophysiology & Therapeutics, School of Pharmacy and Pharmaceutical Sciences, Hoshi University, Tokyo, Japan. a-saitoh@hoshi.ac.jp
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Saitoh
authors.forename: Noritaka
authors.initials: N
authors.lastname: Hirose
authors.forename: Mitsuhiko
authors.initials: M
authors.lastname: Yamada
authors.forename: Misa
authors.initials: M
authors.lastname: Yamada
authors.forename: Chihiro
authors.initials: C
authors.lastname: Nozaki
authors.forename: Takuma
authors.initials: T
authors.lastname: Oka
authors.forename: Junzo
authors.initials: J
authors.lastname: Kamei
mesh_terms: D017371:8-Hydroxy-2-(di-n-propylamino)tetralin / Q000494:pharmacology; D000818:Animals; D014151:Anti-Anxiety Agents / Q000494:pharmacology*; D001522:Behavior, Animal / Q000187:drug effects*; D001549:Benzamides / Q000494:pharmacology; D003975:Diazepam / Q000494:pharmacology; D004305:Dose-Response Relationship, Drug; D004644:Emotions / Q000187:drug effects*; D005106:Exploratory Behavior / Q000187:drug effects*; D019416:Head Movements / Q000187:drug effects; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D009043:Motor Activity / Q000187:drug effects; D000857:Olfaction Disorders / Q000139:chemically induced / Q000523:psychology; D009830:Olfactory Bulb / Q000601:surgery*; D010879:Piperazines / Q000494:pharmacology; D011930:Reaction Time / Q000187:drug effects; D012934:Social Isolation; D019287:Zinc Sulfate
chemical_list: D014151:Anti-Anxiety Agents; D001549:Benzamides; D010879:Piperazines; C088464:4-(alpha-(4-allyl-2,5-dimethyl-1-piperazinyl)-3-methoxybenzyl)-N,N-diethylbenzamide; D019287:Zinc Sulfate; D017371:8-Hydroxy-2-(di-n-propylamino)tetralin; D003975:Diazepam