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The role of subcortical hippocampal inputs in contextual memory formation

Grayson VS, Han Y, Guedea AL, Jovasevic V, Gao C, Apkarian A, Radulovic JM (2019) The role of subcortical hippocampal inputs in contextual memory formation. Neuroscience 2019 Abstracts 786.03. Society for Neuroscience, Chicago, IL.

Summary: The role of cortical efferents to the hippocampus in the formation of episodic-like memory is well established, however, less is known about the contribution of subcortical memory circuits to memory. In the present study, we studied the roles of several subcortical inputs into the dorsal hippocampus in mouse models of contextual fear conditioning, extinction, and reinstatement. Fear conditioning was induced by a single exposure of mice to a context followed by foot shock. Subsequently, mice were exposed to daily extinction trials. After significant reduction of freezing, indicating successful extinction, mice were exposed to a brief reminder shock and re-tested in the conditioning context. Circuit manipulations were performed by chemogenetic silencing with the inhibitory designer receptor exclusively activated by designer drugs (DREADD) hM4(Gi) or targeted cholinergic depletion induced by 192 IgG-saporin, at different stages of fear conditioning, extinction, and reinstatement. We identified projection- and neurotransmitter-specific roles of discrete circuits, indicating complex regulation of fear-inducing memories by subcortical afferents.

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