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Cell ; 178(3): 653-671.e19, 2019 07 25.
Artigo em Inglês | MEDLINE | ID: mdl-31348890

RESUMO

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.


Assuntos
Motivação/efeitos dos fármacos , Peptídeos Opioides/farmacologia , Recompensa , Área Tegmentar Ventral/metabolismo , Potenciais de Ação , Animais , Comportamento Animal/efeitos dos fármacos , Feminino , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Camundongos Transgênicos , Neurônios/fisiologia , Técnicas de Patch-Clamp , Precursores de Proteínas/genética , Receptores Opioides/agonistas , Receptores Opioides/deficiência , Receptores Opioides/genética , Receptor de Nociceptina , Nociceptina
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