An inhibitory hippocampal-thalamic pathway modulates remote memory retrieval.

An inhibitory hippocampal-thalamic pathway modulates remote memory retrieval.
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抑制性海马-丘脑通路调节远程记忆检索。

DOI:
10.1038/s41593-021-00819-3
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发表时间:
2021-05
影响因子:
25
通讯作者:
Frankland PW
Frankland PW
中科院分区:
医学1区
文献类型:
--
作者:
Vetere G;Xia F;Ramsaran AI;Tran LM;Josselyn SA;Frankland PW

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记忆是由分布式的大脑皮层-丘脑-丘脑网络支持的,但对网络活动有贡献的大脑区域可能会随着记忆年龄的变化而变化。这个重组过程被称为系统巩固,以前的研究已经研究了不同海马,丘脑和皮质脑区域的激活与回忆时的记忆年龄之间的关系。随着记忆年龄的增长,一些大脑区域的激活会增加,而其他区域则会变得不那么活跃。在小鼠中,我们发现丘脑前背侧核(anterodoral thalamic nucleus)的主动脱离对于在遥远的时间点回忆是必要的,此外,哪些投射介导了这种抑制。具体来说,我们确定了一个稀疏的抑制性投射从CA 3丘脑前背核,在系统巩固过程中变得更加活跃,这样,它是必要的上下文恐惧记忆检索在远程,但不是最近,学习后的时间点。
Memories are supported by distributed hippocampal–thalamic–cortical networks, but the brain regions that contribute to network activity may vary with memory age. This process of reorganization is referred to as systems consolidation, and previous studies have examined the relationship between the activation of different hippocampal, thalamic, and cortical brain regions and memory age at the time of recall. While the activation of some brain regions increases with memory age, other regions become less active. In mice, here we show that the active disengagement of one such brain region, the anterodorsal thalamic nucleus, is necessary for recall at remote time-points and, in addition, which projection(s) mediate such inhibition. Specifically, we identified a sparse inhibitory projection from CA3 to the anterodorsal thalamic nucleus that becomes more active during systems consolidation, such that it is necessary for contextual fear memory retrieval at remote, but not recent, time-points post-learning.
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