Extinction of Cocaine Memory Depends on a Feed-Forward Inhibition Circuit Within the Medial Prefrontal Cortex

Cocaine-associated environments (i.e., contexts) evoke persistent memories of cocaine reward and thereby contribute to the maintenance of addictive behavior in cocaine users. From a therapeutic perspective, enhancing inhibitory control over cocaine-conditioned responses is of pivotal importance but...

Full description

Saved in:
Bibliographic Details
Published in:Biological psychiatry (1969) Vol. 91; no. 12; pp. 1029 - 1038
Main Authors: Visser, Esther, Matos, Mariana R., Mitrić, Miodrag M., Kramvis, Ioannis, van der Loo, Rolinka J., Mansvelder, Huibert D., Smit, August B., van den Oever, Michel C.
Format: Journal Article
Language:English
Published: United States Elsevier Inc 15-06-2022
Subjects:
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Cocaine-associated environments (i.e., contexts) evoke persistent memories of cocaine reward and thereby contribute to the maintenance of addictive behavior in cocaine users. From a therapeutic perspective, enhancing inhibitory control over cocaine-conditioned responses is of pivotal importance but requires a more detailed understanding of the neural circuitry that can suppress context-evoked cocaine memories, e.g., through extinction learning. The ventral medial prefrontal cortex (vmPFC) and dorsal medial prefrontal cortex (dmPFC) are thought to bidirectionally regulate responding to cocaine cues through their projections to other brain regions. However, whether these mPFC subregions interact to enable adaptive responding to cocaine-associated contextual stimuli has remained elusive. We used antero- and retrograde tracing combined with chemogenetic intervention to examine the role of vmPFC-to-dmPFC projections in extinction of cocaine-induced place preference in mice. In addition, electrophysiological recordings and optogenetics were used to determine whether parvalbumin-expressing inhibitory interneurons and pyramidal neurons in the dmPFC are innervated by vmPFC projections. We found that vmPFC-to-dmPFC projecting neurons are activated during unreinforced re-exposure to a cocaine-associated context, and selective suppression of these cells impairs extinction learning. Parvalbumin-expressing inhibitory interneurons in the dmPFC receive stronger monosynaptic excitatory input from vmPFC projections than local dmPFC pyramidal neurons, consequently resulting in disynaptic inhibition of pyramidal neurons. In line with this, we show that chemogenetic suppression of dmPFC parvalbumin-expressing inhibitory interneurons impairs extinction learning. Our data reveal that vmPFC projections mediate extinction of a cocaine-associated contextual memory through recruitment of feed-forward inhibition in the dmPFC, thereby providing a novel neuronal substrate that promotes extinction-induced inhibitory control.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0006-3223
1873-2402
DOI:10.1016/j.biopsych.2021.08.008