Xu Chun, Krabbe Sabine, Gründemann Jan, Botta Paolo, Fadok Jonathan P, Osakada Fumitaka, Saur Dieter, Grewe Benjamin F, Schnitzer Mark J, Callaway Edward M, Lüthi Andreas
Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, 4058 Basel, Switzerland.
Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, 4058 Basel, Switzerland; University of Basel, 4003 Basel, Switzerland.
Cell. 2016 Nov 3;167(4):961-972.e16. doi: 10.1016/j.cell.2016.09.051. Epub 2016 Oct 20.
Memories about sensory experiences are tightly linked to the context in which they were formed. Memory contextualization is fundamental for the selection of appropriate behavioral reactions needed for survival, yet the underlying neuronal circuits are poorly understood. By combining trans-synaptic viral tracing and optogenetic manipulation, we found that the ventral hippocampus (vHC) and the amygdala, two key brain structures encoding context and emotional experiences, interact via multiple parallel pathways. A projection from the vHC to the basal amygdala mediates fear behavior elicited by a conditioned context, whereas a parallel projection from a distinct subset of vHC neurons onto midbrain-projecting neurons in the central amygdala is necessary for context-dependent retrieval of cued fear memories. Our findings demonstrate that two fundamentally distinct roles of context in fear memory retrieval are processed by distinct vHC output pathways, thereby allowing for the formation of robust contextual fear memories while preserving context-dependent behavioral flexibility.
关于感官体验的记忆与形成这些记忆的背景紧密相连。记忆情境化对于选择生存所需的适当行为反应至关重要,然而其潜在的神经回路却知之甚少。通过结合跨突触病毒追踪和光遗传学操作,我们发现腹侧海马体(vHC)和杏仁核这两个编码情境和情感体验的关键脑结构通过多条平行通路相互作用。从vHC到基底杏仁核的投射介导了由条件性情境引发的恐惧行为,而从vHC神经元的一个不同子集到中央杏仁核中投射至中脑的神经元的平行投射对于线索性恐惧记忆的情境依赖性检索是必要的。我们的研究结果表明,情境在恐惧记忆检索中的两个根本不同的作用是由不同的vHC输出通路处理的,从而在保持情境依赖性行为灵活性的同时,允许形成强大的情境恐惧记忆。