在缺乏多巴胺载体的小鼠中,对可卡因和安非他胺的超运动和冷漠
1Howard Hughes Medical Institute Laboratories, Department of Cell Biology, Duke University Medical Center, Durham, North Carolina 27710, USA.
Nature
|February 15, 1996
概括
缺乏多巴胺转运基因的小鼠由于长时间的多巴胺信号传递而表现出过度活跃. 这突显了传递器在调节神经传递和精神刺激作用中的关键作用.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 药理学 药理学是指药理学的学科.
背景情况:
- 多巴胺转运体 (DAT) 调节细胞外多巴胺水平,影响神经传递.
- DAT是可卡因和安非他胺等精神刺激药物的关键目标.
研究的目的:
- 研究DAT基因破坏对小鼠行为和多巴胺系统调节的影响.
- 阐明DAT在精神刺激作用中的作用.
主要方法:
- 产生和分析具有破坏多巴胺载体基因的小鼠.
- 评估运动活动和细胞外多巴胺水平.
- 在这些小鼠身上测试可卡因和安非他胺的影响.
主要成果:
- 没有DAT的小鼠表现出自发的超运动.
- 细胞外多巴胺水平显著升高 (增加100倍以上).
- 在DAT-null小鼠中,精神兴奋剂对发动机活动和多巴胺释放/吸收丧失了作用.
结论:
- 多巴胺转运体对于调节细胞外多巴胺和正常的运动运动活动至关重要.
- DAT 干扰解释了高多巴胺类表型和对精神刺激剂缺乏反应.
- 这项研究强调了DAT在多巴胺平衡和药物作用中的关键作用.
相关概念视频
01:25Adrenergic Agonists: Indirect-Acting Agents
Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...
01:24CNS Stimulants: Cocaine, Amphetamines and Cannabinoids
CNS stimulants, such as cocaine, amphetamines, and cannabinoids, have varying structures and mechanisms of action that lead to different therapeutic effects and side effects. Cocaine, with its molecular formula C17H21NO4, is a tropane alkaloid and a tertiary amino compound. It has two chemical forms: the hydrochloride salt and the "freebase." The former is in powder form, while the latter involves removing the hydrochloride salt to create a form that can be smoked. Cocaine exerts its effects by...