Cocaine Place Conditioning Strengthens Location-Specific Hippocampal Coupling to the Nucleus Accumbens

Neuron. 2018 Jun 6;98(5):926-934.e5. doi: 10.1016/j.neuron.2018.04.015. Epub 2018 May 10.

Abstract

Conditioned place preference (CPP) is a widely used model of addiction-related behavior whose underlying mechanisms are not understood. In this study, we used dual site silicon probe recordings in freely moving mice to examine interactions between the hippocampus and nucleus accumbens in cocaine CPP. We found that CPP was associated with recruitment of D2-positive nucleus accumbens medium spiny neurons to fire in the cocaine-paired location, and this recruitment was driven predominantly by selective strengthening of coupling with hippocampal place cells that encode the cocaine-paired location. These findings provide in vivo evidence suggesting that the synaptic potentiation in the accumbens caused by repeated cocaine administration preferentially affects inputs that were active at the time of drug exposure. This provides a potential physiological mechanism by which drug use becomes associated with specific environmental contexts.

Keywords: Cocaine; accumbens; addiction; conditioned place preference; corticostriatal; hippocampus; plasticity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • CA1 Region, Hippocampal / cytology
  • CA1 Region, Hippocampal / metabolism*
  • CA1 Region, Hippocampal / physiology
  • Cocaine*
  • Cocaine-Related Disorders*
  • Conditioning, Classical / physiology*
  • Disease Models, Animal
  • Dopamine Uptake Inhibitors*
  • Hippocampus / cytology
  • Hippocampus / metabolism
  • Hippocampus / physiology
  • Interneurons / metabolism
  • Mice
  • Neural Pathways
  • Neurons / metabolism*
  • Nucleus Accumbens / cytology
  • Nucleus Accumbens / metabolism*
  • Nucleus Accumbens / physiology
  • Pyramidal Cells / metabolism
  • Receptors, Dopamine D2 / metabolism

Substances

  • DRD2 protein, mouse
  • Dopamine Uptake Inhibitors
  • Receptors, Dopamine D2
  • Cocaine