, Volume 232, Issue 20, pp 3753–3761 | Cite as

Cortical GluN2B deletion attenuates punished suppression of food reward-seeking

  • Anna K. Radke
  • Kazu Nakazawa
  • Andrew Holmes
Original Investigation



Compulsive behavior, which is a hallmark of psychiatric disorders such as addiction and obsessive-compulsive disorder, engages corticostriatal circuits. Previous studies indicate a role for corticostriatal N-methyl-d-aspartate receptors (NMDARs) in mediating compulsive-like responding for drugs of abuse, but the specific receptor subunits controlling reward-seeking in the face of punishment remain unclear.


The current study assessed the involvement of corticostriatal GluN2B-containing NMDARs in measures of persistent and punished food reward-seeking.


Mice with genetic deletion of GluN2B in one of three distinct neuronal populations, cortical principal neurons, forebrain interneurons, or striatal medium spiny neurons, were tested for (1) sustained food reward-seeking when reward was absent, (2) reward-seeking under a progressive ratio schedule of reinforcement, and (3) persistent reward-seeking after a footshock punishment.


Mutant mice with genetic deletion of GluN2B in cortical principal neurons demonstrated attenuated suppression of reward-seeking during punishment. These mice performed normally on other behavioral measures, including an assay for pain sensitivity. Mutants with interneuronal or striatal GluN2B deletions were normal on all behavioral assays.


Current findings offer novel evidence that loss of GluN2B-containing NMDARs expressed on principal neurons in the cortex results in reduced punished food reward-seeking. These data support the involvement of GluN2B subunit in cortical circuits regulating cognitive flexibility in a variety of settings, with implications for understanding the basis of inflexible behavior in neuropsychiatric disorders including obsessive-compulsive disorders (OCD) and addictions.


Addiction NMDA Prefrontal cortex Motivation Striatum Interneuron Alcohol Drug 



We are grateful to Munisa Bachu, Shaun Flynn, and Adrina Kocharian for technical assistance and to Dr. Jonathan Brigman for the cartoons of the behavioral procedures. This research was supported by the NIAAA Intramural Research Program and NIMH grant K22MH099164.


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Copyright information

© Springer-Verlag Berlin Heidelberg (outside the USA) 2015

Authors and Affiliations

  1. 1.Laboratory of Behavioral and Genomic Neuroscience, National Institute on Alcohol Abuse and AlcoholismNIHBethesdaUSA
  2. 2.Department of Psychiatry and Behavioral NeurobiologyUniversity of Alabama at BirminghamBirminghamUSA
  3. 3.RockvilleUSA

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