Age-dependent regulation of synaptic connections by dopamine D2 receptors.

Age-dependent regulation of synaptic connections by dopamine D2 receptors.
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DOI:
10.1038/nn.3542
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发表时间:
2013-11
影响因子:
25
通讯作者:
Li, Zheng
Li, Zheng
中科院分区:
医学1区
文献类型:
--
作者:
Jia, Jie-Min;Zhao, Jun;Hu, Zhonghua;Lindberg, Daniel;Li, Zheng

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多巴胺 D2 受体 (D2R) 是 G 蛋白偶联受体,可调节突触传递,在各种大脑功能中发挥重要作用,包括影响学习和工作记忆。 D2R 信号传导异常与精神分裂症等精神疾病有关。在这里,我们报告了 D2R 在树突棘形态发生中的新功能。 D2R 的激活通过小鼠中的 GluN2B 和 cAMP 依赖性机制减少脊柱数量。值得注意的是,这种调节仅发生在青春期。在此期间,由精神分裂症风险基因失调蛋白突变引起的 D2R 过度激活会导致脊柱缺陷、内嗅海马回路连接失调以及空间工作记忆受损。值得注意的是,这些缺陷可以通过青春期期间施用的 D2R 阻滞剂来改善。这些发现揭示了 D2R 在脊柱发育中的一种新的年龄依赖性功能,提供了青春期 D2R 功能障碍损害神经元回路和工作记忆的证据,并表明青少年对异常 D2R 活动的干预可以预防认知障碍。
Dopamine D2 receptors (D2R) are G protein–coupled receptors that modulate synaptic transmission and play an important role in various brain functions including affect learning and working memory. Abnormal D2R signaling has been implicated in psychiatric disorders such as schizophrenia. Here we report a new function of D2R in dendritic spine morphogenesis. Activation of D2R reduces spine number via GluN2B– and cAMP–dependent mechanisms in mice. Notably, this regulation takes place only during adolescence. During this period, D2R overactivation caused by mutations in the schizophrenia–risk–gene dysbindin leads to spine deficiency, dysconnectivity within the entorhinal–hippocampal circuit and impairment of spatial working memory. Notably, these defects can be ameliorated by D2R blockers administered during adolescence. These findings uncover a novel age–dependent function of D2R in spine development, provide evidence that D2R dysfunction during adolescence impairs neuronal circuits and working memory, and suggest that adolescent interventions of aberrant D2R activity protect against cognitive impairment.
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