1. Academic Validation
  2. Neurogranin in the nucleus accumbens regulates NMDA receptor tolerance and motivation for ethanol seeking

Neurogranin in the nucleus accumbens regulates NMDA receptor tolerance and motivation for ethanol seeking

  • Neuropharmacology. 2018 Mar 15;131:58-67. doi: 10.1016/j.neuropharm.2017.12.008.
Ashlie N Reker 1 Alfredo Oliveros 2 John M Sullivan 3rd 1 Lailun Nahar 1 David J Hinton 2 Taehyun Kim 2 Robert C Bruner 2 Doo-Sup Choi 2 Nicholas E Goeders 1 Hyung W Nam 3
Affiliations

Affiliations

  • 1 Department of Pharmacology, Toxicology, and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA.
  • 2 Department of Molecular Pharmacology and Experimental Therapeutics, Mayo Clinic College of Medicine, Rochester, MN 55905, USA.
  • 3 Department of Pharmacology, Toxicology, and Neuroscience, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA. Electronic address: [email protected].
Abstract

Dysfunction of N-methyl-d-aspartate receptor (NMDAR) signaling in the nucleus accumbens (NAc) has been implicated in the pathophysiology of alcohol use disorders (AUD). Neurogranin (Ng), a calmodulin-binding protein, is exclusively expressed in the post-synapse, and mediates NMDAR driven synaptic plasticity by regulating the calcium-calmodulin (Ca2+-CaM) pathway. To study the functional role of Ng in AUD, we administrated behavior tests including Pavlovian instrument transfer (PIT), operant conditioning, and rotarod test using Ng null mice (Ng-/- mice). We used adeno-associated virus (AAV)-mediated Ng expression and pharmacological manipulation to validate behavioral responses in Ng-/- mice. The results from our multidisciplinary approaches demonstrated that deficit of Ng increases tolerance to NMDAR inhibition and elicit faster cue reactivity during PIT without changes in ethanol reward. Operant conditioning results demonstrated that Ng-/- mice self-administered significantly more ethanol and displayed reduced sensitivity to aversive motivation. We identified that ethanol exposure decreases mGluR5 (metabotropic glutamate receptor 5) expression in the NAc of Ng-/- mice and pharmacological inhibition of mGluR5 reverses NMDAR desensitization in Ng-/- mice. Together these findings specifically suggest that accumbal Ng plays an essential role in the counterbalance between NMDAR and mGluR5 signaling; which alters NMDAR resistance, and thereby altering aversive motivation for ethanol and may ultimately contribute to susceptibility for alcohol addiction.

Keywords

Ethanol; Glutamate receptors; Motivation; Neurogranin; Nucleus accumbens; Operant conditioning.

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