A Paranigral VTA Nociceptin Circuit that Constrains Motivation for Reward

Kyle E. Parker, Christian E. Pedersen, Adrian M. Gomez, Skylar M. Spangler, Marie C. Walicki, Shelley Y. Feng, Sarah L. Stewart, James M. Otis, Ream Al-Hasani, Jordan G. McCall, Kristina Sakers, Dionnet L. Bhatti, Bryan A. Copits, Robert W. Gereau, Thomas Jhou, Thomas J. Kash, Joseph D. Dougherty, Garret D. Stuber, Michael R. Bruchas

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

Nociceptin and its receptor are widely distributed throughout the brain in regions associated with reward behavior, yet how and when they act is unknown. Here, we dissected the role of a nociceptin peptide circuit in reward seeking. We generated a prepronociceptin (Pnoc)-Cre mouse line that revealed a unique subpopulation of paranigral ventral tegmental area (pnVTA) neurons enriched in prepronociceptin. Fiber photometry recordings during progressive ratio operant behavior revealed pnVTAPnoc neurons become most active when mice stop seeking natural rewards. Selective pnVTAPnoc neuron ablation, inhibition, and conditional VTA nociceptin receptor (NOPR) deletion increased operant responding, revealing that the pnVTAPnoc nucleus and VTA NOPR signaling are necessary for regulating reward motivation. Additionally, optogenetic and chemogenetic activation of this pnVTAPnoc nucleus caused avoidance and decreased motivation for rewards. These findings provide insight into neuromodulatory circuits that regulate motivated behaviors through identification of a previously unknown neuropeptide-containing pnVTA nucleus that limits motivation for rewards.

Original languageEnglish
Pages (from-to)653-671.e19
JournalCell
Volume178
Issue number3
DOIs
StatePublished - Jul 25 2019

Keywords

  • NOPR
  • motivation
  • neuropeptide
  • nociceptin
  • opioid
  • optogenetics
  • orphanin FQ
  • photometry
  • reward
  • ventral tegmental area

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