Alpha2C-adrenoceptor-overexpressing mice are impaired in executing nonspatial and spatial escape strategies.

Alpha2C-adrenoceptor-overexpressing mice are impaired in executing nonspatial and spatial escape strategies.
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Alpha2C-肾上腺素受体过度表达的小鼠在执行非空间和空间逃避策略方面受到损害。

DOI:
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发表时间:
1998
影响因子:
3.6
通讯作者:
P. Riekkinen
P. Riekkinen
中科院分区:
医学3区
文献类型:
--
作者:
M. Björklund;J. Sirviö;J. Puoliväli;J. Sallinen;P. Jäkälä;M. Scheinin;B. Kobilka;P. Riekkinen

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通过α2-肾上腺素能受体作用的药物通过额纹丘脑反馈环调节认知功能。Alpha2C-肾上腺素受体亚型在基底节、海马体和新皮质表达,这些区域与记忆和其他认知功能有关。α2C过表达(OE)小鼠在空间或非空间水迷宫(WM)实验中均受到损伤,α2拮抗剂治疗可完全逆转OE小鼠的WM逃避缺陷。然而,Alpha2C的过度表达并不影响开放领域和被动回避行为或皮层脑电觉醒,也不影响Alpha2激动剂或拮抗剂药物对这些功能的作用。我们的结果表明,α2C-肾上腺素受体可以调节导航到隐藏或可见的逃逸平台,而α2-肾上腺素能药物的许多其他作用,如镇静,不是通过α2C-肾上腺素受体介导的。因此,缺乏α2C-AR亲和力的α2激动剂或α2C-AR亚型选择性α2拮抗剂能够比目前的非选择性亚型药物更有效地调节额纹状体反馈环的功能。
Drugs acting via alpha2-adrenoceptors modulate cognitive functions mediated via frontostriatothalamic feedback loops. The alpha2C-adrenoceptor subtype is expressed in the basal ganglia, hippocampus, and neocortex, areas that are involved in memory and other cognitive functions. alpha2C-Overexpressing (OE) mice were impaired in spatial or nonspatial water maze (WM) tests, and alpha2 antagonist treatment fully reversed the WM escape defect in OE mice. However, alpha2C-overexpression did not influence open field and passive avoidance behaviors or cortical EEG arousal or the actions of alpha2 agonist or antagonist drugs on these functions. Our results suggest that alpha2C-adrenoceptors can modulate navigation to a hidden or visible escape platform, whereas many other actions of alpha2-adrenergic agents, such as sedation, are not mediated via alpha2C-adrenoceptors. Therefore, alpha2-agonists lacking alpha2C-AR affinity or alpha2C-AR subtype-selective alpha2 antagonists could modulate functioning of frontostriatothalamic feedback loops more effectively than the current subtype-nonselective drugs.
编码小鼠 α2c-肾上腺素受体同系物的基因的靶向失活。
DOI: --
发表时间: 1995
期刊: Molecular pharmacology.
影响因子: --
作者:
Link,RE;Stevens,MS;Kulatunga,M;Scheinin,M;Barsh,GS;Kobilka,BK
通讯作者: Kobilka,BK
克隆编码 α2-肾上腺素能受体亚型的两个小鼠基因,并鉴定小鼠 α2-C10 同源物中负责拮抗剂结合的种间变异的单个氨基酸。
DOI: --
发表时间: 1992
影响因子: 3.6
作者:
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通讯作者: Kobilka,B
配体诱导的组成型活性β2-肾上腺素受体的过度表达:转基因小鼠表型的药理学创造。
DOI: 10.1073/pnas.94.1.137
发表时间: 1997
影响因子: 11.1
作者:
Samama,P;Bond,RA;Rockman,HA;Milano,CA;Lefkowitz,RJ
通讯作者: Lefkowitz,RJ
DOI: 10.1126/science.2999977
发表时间: 1985-01-01
期刊: SCIENCE
影响因子: 56.9
作者:
ARNSTEN, AFT;GOLDMANRAKIC, PS
通讯作者: GOLDMANRAKIC, PS