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Volume 16, Number 23, Issue of December 1, 1996 pp. 7768-7775
Copyright ©1996 Society for NeuroscienceDopamine and Spatial Working Memory in Rats and Monkeys: Pharmacological Reversal of Stress-Induced Impairment
Received June 28, 1996; revised Sept. 11, 1996; accepted Sept. 16, 1996.
Beth L. Murphy1, Amy F. T. Arnsten3, J. David Jentsch3, and Robert H. Roth1, 2 Departments of 1 Pharmacology and 2 Psychiatry, and 3 Section of Neurobiology, Yale Medical School, New Haven, Connecticut 06510-8001
The anxiogenic benzodiazepine inverse agonist FG7142 increases dopamine turnover in rodent prefrontal cortex but not in other dopamine terminal field areas. FG7142-induced increases in prefrontal cortical dopamine receptor stimulation impair prefrontal-dependent, but not nonprefrontal-dependent, cognitive tasks in rats and monkeys. The degree of impairment correlates with levels of prefrontal cortical dopamine turnover in rats and can be blocked in rats and monkeys with dopamine receptor antagonists, suggesting that increased dopamine turnover is directly related to the cognitive deficits.
The current study examined nondopaminergic drug effects on FG7142-perturbed biochemistry and cognition. Both the noradrenergic
-2 agonist clonidine and the glycine/NMDA antagonist (+)HA966 prevented the FG7142-induced increase in dopamine turnover in rodent prefrontal cortex. Infusion of (+)HA966 into the ventral tegmental area (VTA) also blocked this increase in dopamine turnover, indicating that critical modulatory effects of (+)HA966 on FG7142-induced changes in dopamine turnover are occurring at the level of mesoprefrontal dopamine neuron cell bodies. Systemic (+)HA966 and clonidine, but not propranolol or D-cycloserine, prevented FG7142-associated spatial working memory deficits in rats and monkeys. These results support the idea of a critical range of dopamine turnover for optimal prefrontal cortical cognitive functioning, with excessive dopamine turnover leading to cognitive impairment. These studies also provide evidence for the regulation of prefrontal cortical dopamine turnover and cognition by multiple neurotransmitter systems and suggest that the VTA is an important regulatory site for these effects.
Key words: rat; primate; FG7142; dopamine; clonidine; propranolol; norepinephrine; (+)HA-966; D-cycloserine; NMDA; prefrontal cortex; delayed alternation; delayed response; memory; cognition
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