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Off-Target Influences of Arch-Mediated Axon Terminal Inhibition on Network Activity and Behavior.

Author(s): Lafferty CK, Britt JP

Front Neural Circuits. 2020;14:10 Authors: Lafferty CK, Britt JP

Article GUID: 32269514
Nucleus Accumbens Cell Type- and Input-Specific Suppression of Unproductive Reward Seeking.

Author(s): Lafferty CK, Yang AK, Mendoza JA, Britt JP

Cell Rep. 2020 Mar 17;30(11):3729-3742.e3 Authors: Lafferty CK, Yang AK, Mendoza JA, Britt JP

Article GUID: 32187545
Hippocampal Input to the Nucleus Accumbens Shell Enhances Food Palatability.

Author(s): Yang AK, Mendoza JA, Lafferty CK, Lacroix F, Britt JP

Biol Psychiatry. 2019 Sep 19;: Authors: Yang AK, Mendoza JA, Lafferty CK, Lacroix F, Britt JP

Article GUID: 31699294
Cue-Evoked Dopamine Neuron Activity Helps Maintain but Does Not Encode Expected Value.

Author(s): Mendoza JA, Lafferty CK, Yang AK, Britt JP

Cell Rep. 2019 Nov 05;29(6):1429-1437.e3 Authors: Mendoza JA, Lafferty CK, Yang AK, Britt JP

Article GUID: 31693885
Coordinated Reductions in Excitatory Input to the Nucleus Accumbens Underlie Food Consumption.

Author(s): Reed SJ, Lafferty CK, Mendoza JA, Yang AK, Davidson TJ, Grosenick L, Deisseroth K, Britt JP

Neuron. 2018 Sep 19;99(6):1260-1273.e4 Authors: Reed SJ, Lafferty CK, Mendoza JA, Yang AK, Davidson TJ, Grosenick L, Deisseroth K, Britt JP

Article GUID: 30146308
Title:Off-Target Influences of Arch-Mediated Axon Terminal Inhibition on Network Activity and Behavior.
Authors:Lafferty CK,  Britt JP
Link:https://www.ncbi.nlm.nih.gov/pubmed/32269514?dopt=Abstract
DOI:10.3389/fncir.2020.00010
Category:Front Neural Circuits
PMID:32269514
Dept Affiliation: CSBN
1 Department of Psychology, McGill University, Montreal, QC, Canada.
2 Center for Studies in Behavioral Neurobiology, Concordia University, Montreal, QC, Canada.

Description:

Off-Target Influences of Arch-Mediated Axon Terminal Inhibition on Network Activity and Behavior.

Front Neural Circuits. 2020;14:10

Authors: Lafferty CK, Britt JP

Abstract

Archaerhodopsin (ArchT)-mediated photoinhibition of axon terminals is commonly used to test the involvement of specific long-range neural projections in behavior. Although sustained activation of this opsin in axon terminals has the unintended consequence of enhancing spontaneous vesicle release, it is unclear whether this desynchronized signaling is consequential for ArchT's behavioral effects. Here, we compare axon terminal and cell body photoinhibition of nucleus accumbens (NAc) afferents to test the utility of these approaches for uncovering pathway-specific contributions of neural circuits to behavior. First, in brain slice recordings we confirmed that ArchT photoinhibition of glutamatergic axons reduces evoked synaptic currents and increases spontaneous transmitter release. A further consequence was increased interneuron activity, which served to broadly suppress glutamate input via presynaptic GABAB receptors. In vivo, axon terminal photoinhibition increased feeding and reward-seeking behavior irrespective of the afferent pathway targeted. These behavioral effects are comparable to those obtained with broad inhibition of NAc neurons. In contrast, cell body inhibition of excitatory NAc afferents revealed a pathway-specific contribution of thalamic input to feeding behavior and amygdala input to reward-seeking under extinction conditions. These findings underscore the off-target behavioral consequences of ArchT-mediated axon terminal inhibition while highlighting cell body inhibition as a valuable alternative for pathway-specific optogenetic silencing.

PMID: 32269514 [PubMed - in process]