Striatal dopamine D1 receptor is essential for contextual fear conditioning.

Striatal dopamine D1 receptor is essential for contextual fear conditioning.
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DOI:
10.1038/srep03976
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发表时间:
2014-02-05
期刊:
影响因子:
4.6
通讯作者:
Mishina M
Mishina M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ikegami M;Uemura T;Kishioka A;Sakimura K;Mishina M

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恐惧记忆对于动物触发对潜在威胁刺激的行为适应性反应至关重要,而过多或不适当的恐惧可能会导致精神问题。大量研究表明杏仁核、海马和内侧前额叶皮层在巴甫洛夫恐惧条件反射中起重要作用。最近,我们发现当非条件刺激较弱时,纹状体神经元参与听觉恐惧记忆的形成。在这里,我们发现,选择性消融纹状体神经元强烈地减少了上下文的恐惧条件反射的强度无关的足电击。此外,在纹状体特异性多巴胺D1受体敲除小鼠中,背景恐惧条件反射强烈减少。另一方面,纹状体特异性多巴胺D2受体敲除小鼠表现出与对照小鼠相当的冻结反应。这些结果表明,纹状体D1受体是必不可少的上下文恐惧条件反射。
Fear memory is critical for animals to trigger behavioural adaptive responses to potentially threatening stimuli, while too much or inappropriate fear may cause psychiatric problems. Numerous studies have shown that the amygdala, hippocampus and medial prefrontal cortex play important roles in Pavlovian fear conditioning. Recently, we showed that striatal neurons are required for the formation of the auditory fear memory when the unconditioned stimulus is weak. Here, we found that selective ablation of striatal neurons strongly diminished contextual fear conditioning irrespective of the intensity of footshock. Furthermore, contextual fear conditioning was strongly reduced in striatum-specific dopamine D1 receptor knockout mice. On the other hand, striatum-specific dopamine D2 receptor knockout mice showed freezing responses comparable to those of control mice. These results suggest that striatal D1 receptor is essential for contextual fear conditioning.
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