Journal of Molecular Neuroscience

, Volume 47, Issue 3, pp 546–553

Inactivation of PKMζ in the NAc Shell Abolished Cocaine-Conditioned Reward

Article

DOI: 10.1007/s12031-011-9671-7

Cite this article as:
Shabashov, D., Shohami, E. & Yaka, R. J Mol Neurosci (2012) 47: 546. doi:10.1007/s12031-011-9671-7

Abstract

Preventing relapse to drug use is a major challenge for the treatment of drug addiction. Environmental cues are among the major determinants of relapse in abstinent cocaine users. The protein kinase M ζ (PKMζ) is involved in the generation and maintenance of long-term potentiation and is critical in memory storage. Here we show that inhibition of PKMζ in the nucleus accumbens (NAc) shell, a major component of the reward system that plays an important role in mediating drug craving and relapse, by a selective inhibitor ζ inhibitory peptide (ZIP), abolished cocaine-induced conditioned place preference (CPP). However, the injection of ZIP into the NAc core resulted in earlier onset of CPP extinction. Finally, we found that the levels of PKMζ and GluR2 in the NAc remained unchanged, while the GluR1 levels were elevated following CPP and fully reversed by ZIP injection. Together, our results suggest that inactivation of PKMζ in the NAc may result in the dissociation between the rewarding properties of the drug and the drug-related environment and may serve as a novel target for the treatment of drug relapse.

Keywords

Addiction Memory PKMζ Cocaine Conditioned place preference GluR1 GluR2 ZIP 

Abbreviations

PKMζ

Protein kinase Mζ

ZIP

ζ Inhibitory peptide

CPP

Conditioned place preference

NAc

Nucleus accumbens

DA

Dopamine

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Institute for Drug Research (IDR), School of Pharmacy, Faculty of MedicineThe Hebrew University of JerusalemJerusalemIsrael
  2. 2.Department of Pharmacology, School of Pharmacy, Faculty of MedicineThe Hebrew University of JerusalemJerusalemIsrael