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|Title:||Basal Forebrain and Brainstem Cholinergic Neurons Differentially Impact Amygdala Circuits and Learning-Related Behavior.|
Hay, Y. Audrey
Phillips, Benjamin U.
Saksida, Lisa M.
Bussey, Tim J.
|Publisher:||Elsevier (Cell Press)|
|Citation:||Current Biology, 2018, 28 (16), pp. 2557-2569.e4|
|Abstract:||The central cholinergic system and the amygdala are important for motivation and mnemonic processes. Different cholinergic populations innervate the amygdala, but it is unclear how these projections impact amygdala processes. Using optogenetic circuit-mapping strategies in choline acetyltransferase (ChAT)-cre mice, we demonstrate that amygdala-projecting basal forebrain and brainstem ChAT-containing neurons can differentially affect amygdala circuits and behavior. Photo-activating ChAT terminals in vitro revealed the underlying synaptic impact of brainstem inputs to the central lateral division to be excitatory, mediated via the synergistic glutamatergic activation of AMPA and NMDA receptors. In contrast, stimulating basal forebrain inputs to the basal nucleus resulted in endogenous acetylcholine (ACh) release, resulting in biphasic inhibition-excitation responses onto principal neurons. Such response profiles are physiological hallmarks of neural oscillations and could thus form the basis of ACh-mediated rhythmicity in amygdala networks. Consistent with this, in vivo basal forebrain ChAT+ activation strengthened amygdala basal nucleus theta and gamma frequency rhythmicity, both of which continued for seconds after stimulation and were dependent on local muscarinic and nicotinic receptor activation, respectively. Activation of brainstem ChAT-containing neurons, however, resulted in a transient increase in central lateral amygdala activity that was independent of cholinergic receptors. In addition, driving these respective inputs in behaving animals induced opposing appetitive and defensive learning-related behavioral changes. Because learning and memory are supported by both cellular and network-level processes in central cholinergic and amygdala networks, these results provide a route by which distinct cholinergic inputs can convey salient information to the amygdala and promote associative biophysical changes that underlie emotional memories.|
|Embargo on file until:||9-Aug-2019|
|Rights:||Copyright © Elsevier (Cell Press) 2018. After an embargo period this version of the paper will be an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.|
|Description:||The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.|
|Appears in Collections:||Published Articles, Dept. of Neuroscience, Psychology and Behaviour|
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