Cholinergic Signaling Alters Stress-Induced Sensitization of Hippocampal Contextual Learning

Post-traumatic stress disorder (PTSD) has a profound contextual component, and has been demonstrated to alter future contextual learning. However, the mechanism by which a single traumatic event affects subsequent contextual experiences has not been isolated. Acetylcholine (ACh) is an important modu...

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Bibliographic Details
Published in:	Frontiers in neuroscience Vol. 13; p. 251
Main Authors:	Hersman, Sarah, Hoffman, Ann N, Hodgins, Liliann, Shieh, Shannon, Lam, Jamie, Parikh, Ashen, Fanselow, Michael S
Format:	Journal Article
Language:	English
Published:	Switzerland Frontiers Research Foundation 19-03-2019 Frontiers Media S.A
Subjects:	acetylcholine Acetylcholine receptors Acetylcholine receptors (muscarinic) amygdala Fear fear learning Hippocampus Hyperactivity Learning Memory Neuroscience Neurosciences Post traumatic stress disorder Scopolamine sensitization stress-enhanced fear learning Trauma Los Angeles California United States > US California amygdala stress-enhanced fear learning hippocampus fear learning acetylcholine sensitization scopolamine
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Summary:	Post-traumatic stress disorder (PTSD) has a profound contextual component, and has been demonstrated to alter future contextual learning. However, the mechanism by which a single traumatic event affects subsequent contextual experiences has not been isolated. Acetylcholine (ACh) is an important modulator of hippocampus-dependent learning such as contextual memory strength. Using Stress-Enhanced Fear Learning (SEFL), which models aspects of PTSD in rats, we tested whether muscarinic acetylcholine receptors (mAChR) in dorsal hippocampus (DH) are required during trauma for the effect of trauma on subsequent contextual fear learning. We infused scopolamine or vehicle into DH immediately before stress, and tested fear in both the trauma context and a novel context after a mild stressor. The results show that during learning, ACh acting on mAChR within the DH is required for sensitization of future contextual fear learning. However, this effect is selective for contextual learning, as this blockade leaves discrete cue sensitization intact. Rather than simply sensitizing the BLA, as previous studies have suggested, SEFL requires cholinergic signaling in DH for contextual sensitization.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 This article was submitted to Neuropharmacology, a section of the journal Frontiers in Neuroscience Reviewed by: Dayan Kessler Knox, University of Delaware, United States; Luke R. Johnson, University of Tasmania, Australia Edited by: Juan J. Canales, University of Tasmania, Australia
ISSN:	1662-4548 1662-453X 1662-453X
DOI:	10.3389/fnins.2019.00251