Characteristics of behavioral abnormalities in α_1d-adrenoceptors deficient mice

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• 作者：Mishima ; Kenichi ; Tanoue ; Akito ; Tsuda ; Masakazu ; Hasebe ; Nobuyoshi ; Fukue ; Yoshihiko ; Egashira ; Nobuaki ; et. al.
• 关键词：α ; _1d-Adrenergic receptor ; Attention ; Acoustic startle response ; NMDA receptor
• 刊名：Behavioural Brain Research
• 出版年：2004
• 出版时间：July 9, 2004
• 年：2004
• 卷：152
• 期：2
• 页码：365-373
• 全文大小：297 K

文摘

To investigate the functional role of α_1d-adrenergic receptor (α_1d-AR) in the CNS, we have generated mutant mice lacking the α_1d-AR using a gene targeting approach and examined in detail the effects of α_1d-AR knockout mice on motor function, sensory function, and learning and memory. α_1d-AR knockout mice showed better motor coordination at the highest rotating speed of the rotarod performance and stronger muscle tone using the traction meter, but their locomotor activity and swimming ability in the water maze were not affected. In the water maze requiring reference memory, α_1d-AR knockout mice showed normal spatial learning. In the Y-maze task requiring working memory or attention, α_1d-AR knockout mice displayed an impaired spontaneous alternation performance. The α_1d-AR knockout mice tended to display lower levels of acoustic startle responses than the wild-type group at lower pulse intensities, although the acoustic prepulse inhibition was not impaired in the α_1d-AR knockout mice. Furthermore, the NMDA receptor antagonist, MK-801-induced deficits of acoustic prepulse inhibition were not observed in the α_1d-AR knockout mice. These results clearly demonstrate that the α_1d-AR receptor plays an important role in the process of auditory sensory function, attention or working memory rather than reference memory, and the sensorimotor gating deficits induced by the NMDA receptor antagonist.