Narp Regulates Long-Term Aversive Effects of Morphine Withdrawal

Irving M. Reti, Hans S. Crombag, Kogo Takamiya, Jeffrey M. Sutton, Ning Guo, Megan L. Dinenna, Richard L. Huganir, Peter C. Holland, Jay M. Baraban

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Although long-lasting effects of drug withdrawal are thought to play a key role in motivating continued drug use, the mechanisms mediating this type of drug-induced plasticity are unclear. Because Narp is an immediate early gene product that is secreted at synaptic sites and binds to alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors, it has been implicated in mediating enduring forms of synaptic plasticity. In previous studies, the authors found that Narp is selectively induced by morphine withdrawal in the extended amygdala, a group of limbic nuclei that mediate aversive behavioral responses. Accordingly, in this study, the authors evaluate whether long-term aversive effects of morphine withdrawal are altered in Narp knockout (KO) mice. The authors found that acute physical signs of morphine withdrawal are unaffected by Narp deletion. However, Narp KO mice acquire and sustain more aversive responses to the environment conditioned with morphine withdrawal than do wild type (WT) controls. Paradoxically, Narp KO mice undergo accelerated extinction of this heightened aversive response. Taken together, these studies suggest that Narp modulates both acquisition and extinction of aversive responses to morphine withdrawal and, therefore, may regulate plasticity processes underlying drug addiction.

Original languageEnglish (US)
Pages (from-to)760-768
Number of pages9
JournalBehavioral Neuroscience
Issue number4
StatePublished - Aug 2008


  • AMPA
  • Naltrexone
  • amygdala
  • immediate early gene
  • place aversion

ASJC Scopus subject areas

  • Behavioral Neuroscience


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