Cholinergic interneurons mediate cocaine extinction in male mice through plasticity across medium spiny neuron subtypes

Weston Fleming, Junuk Lee, Brandy A. Briones, Scott S. Bolkan, Ilana B. Witten

Research output: Contribution to journalArticlepeer-review

Abstract

Cholinergic interneurons (ChINs) in the nucleus accumbens (NAc) have been implicated in the extinction of drug associations, as well as related plasticity in medium spiny neurons (MSNs). However, since most previous work relied on artificial manipulations, whether endogenous acetylcholine signaling relates to drug associations is unclear. Moreover, despite great interest in the opposing effects of dopamine on MSN subtypes, whether ChIN-mediated effects vary by MSN subtype is also unclear. Here, we find that high endogenous acetylcholine event frequency correlates with greater extinction of cocaine-context associations across male mice. Additionally, extinction is associated with a weakening of glutamatergic synapses across MSN subtypes. Manipulating ChIN activity bidirectionally controls both the rate of extinction and the associated plasticity at MSNs. Our findings indicate that NAc ChINs mediate drug-context extinction by reducing glutamatergic synaptic strength across MSN subtypes, and that natural variation in acetylcholine signaling may contribute to individual differences in extinction.

Original languageEnglish (US)
Article number110874
JournalCell Reports
Volume39
Issue number9
DOIs
StatePublished - May 31 2022

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)

Keywords

  • CP: Neuroscience
  • acetylcholine
  • cocaine
  • nucleus accumbens
  • plasticity

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