伏隔核中多巴胺介导的记忆模块形成,用于目标导向导航。
Dopamine-mediated formation of a memory module in the nucleus accumbens for goal-directed navigation.
机构信息
Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, MD, USA.
Max Planck Florida Institute for Neuroscience, Jupiter, FL, USA.
出版信息
Nat Neurosci. 2024 Nov;27(11):2178-2192. doi: 10.1038/s41593-024-01770-9. Epub 2024 Sep 27.
Spatial memories guide navigation efficiently toward desired destinations. However, the neuronal and circuit mechanisms underlying the encoding of goal locations and its translation into goal-directed navigation remain unclear. Here we demonstrate that mice rapidly form a spatial memory of a shelter during shelter experiences, guiding escape behavior toward the goal location-a shelter-when under threat. Dopaminergic neurons in the ventral tegmental area and their projection to the nucleus accumbens (NAc) encode safety signals associated with the shelter. Optogenetically induced phasic dopamine signals are sufficient to create a place memory that directs escape navigation. Converging dopaminergic and hippocampal glutamatergic inputs to the NAc mediate the formation of a goal-related memory within a subpopulation of NAc neurons during shelter experiences. Artificial co-activation of this goal-related NAc ensemble with neurons in the dorsal periaqueductal gray was sufficient to trigger memory-guided, rather than random, escape behavior. These findings provide causal evidence of cognitive circuit modules linking memory with goal-directed action.
空间记忆有效地引导导航前往期望的目的地。然而,目标位置编码及其转化为目标导向导航的神经元和电路机制仍不清楚。在这里,我们证明了小鼠在避难所体验期间会迅速形成对避难所的空间记忆,当受到威胁时,这种记忆会引导其向目标位置——避难所——进行逃避行为。腹侧被盖区中的多巴胺能神经元及其投射到伏隔核(NAc)的投射编码与避难所有关的安全信号。光遗传学诱导的多巴胺信号足以产生一个位置记忆,从而指导逃避导航。在避难所体验期间,会聚的多巴胺能和海马谷氨酸能输入到 NAc 介导了 NAc 神经元亚群中与目标相关的记忆的形成。与背侧脑桥被盖外侧部的神经元人工共同激活这个与目标相关的 NAc 集合足以触发记忆引导的、而非随机的逃避行为。这些发现提供了认知电路模块将记忆与目标导向行动联系起来的因果证据。
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