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Glutamatergic dysfunction is strongly implicated in schizophrenia and mood disorders. GluA1 knockout (KO) mice display schizophrenia- and depression-related abnormalities. Here, we asked whether GluA1 KO show mania-related abnormalities. KO were tested for behavior in approach/avoid conflict tests, responses to repeated forced swim exposure, and locomotor responses under stress and after psychostimulant treatment. The effects of rapid dopamine depletion and treatment with lithium or a GSK-3β inhibitor (SB216763) on KO locomotor hyperactivity were tested. Results showed that KO exhibited novelty- and stress-induced locomotor hyperactivity, reduced forced swim immobility and alterations in approach/avoid conflict tests. Psychostimulant treatment and dopamine depletion exacerbated KO locomotor hyperactivity. Lithium, but not SB216763, treatment normalized KO anxiety-related behavior and partially reversed hyperlocomotor behavior, and also reversed elevated prefrontal cortex levels of phospho-MARCKS and phospho-neuromodulin. Collectively, these findings demonstrate mania-related abnormalities in GluA1 KO and, combined with previous findings, suggest this mutant may provide a novel model of features of schizoaffective disorder.

Original publication

DOI

10.1016/j.nbd.2010.08.005

Type

Journal article

Journal

Neurobiol Dis

Publication Date

12/2010

Volume

40

Pages

608 - 621

Keywords

Animals, Antimanic Agents, Behavior, Animal, Central Nervous System Stimulants, Disease Models, Animal, Gene Deletion, Lithium Compounds, Mice, Mice, Inbred C57BL, Mice, Knockout, Phenotype, Psychotic Disorders, Receptors, AMPA