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Acute low-dose administration of the N-methyl-D-aspartate (NMDA) receptor antagonist, ketamine, produces rapid and sustained antidepressant-like effects in humans and rodents. Recently, we found that the long-lasting effect of ketamine on the forced swim test requires ventral hippocampal (vHipp) activity at the time of drug administration. The medial prefrontal cortex (mPFC), a target of the vHipp dysregulated in depression, is important for cognitive flexibility and response strategy selection. Deficits in cognitive flexibility, the ability to modify thoughts and behaviors in response to changes in the environment, are associated with depression. We have shown that chronic stress impairs cognitive flexibility on the attentional set-shifting test (AST) and induces a shift from active to passive response strategies on the shock-probe defensive burying test (SPDB).

psychopharmacology/psychopharmacologia

Antidepressant-like cognitive and behavioral effects of acute ketamine administration associated with plasticity in the ventral hippocampus to medial prefrontal cortex pathway