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Metabotropic glutamate 2/3 receptors (mGluR2/3) are emerging targets for the reduction of stress that contributes to drug relapse. The effect of a history of cocaine escalation on stress reactivity during abstinence and the role of mGlu2/3 receptors in stress in these animals were tested. Experiment 1-Rats trained to self-administer cocaine, under short(More)
Major precipitating factors for relapse to drug use are stress and exposure to drug-related environmental stimuli. Group II (mGlu(2/3)) metabotropic glutamate receptors (mGluRs) are densely expressed within circuitries mediating the motivating effects of stress and drug cues and, therefore, may participate in regulating drug-seeking linked to both of these(More)
In a previous study, intracerebroventricular calcium-dependent protein kinase (PKC) inhibition attenuated cocaine place conditioning. This suggested the hypothesis that intra-nucleus accumbens (NAc) injections of the PKC inhibitor NPC 15437 may block place conditioning produced by NAc injections of amphetamine. An unbiased conditioned place preference(More)
The bed nucleus of the stria terminalis (BNST) has been implicated in autonomic and hormonal reactions to fearful stimuli, but its role in behavioral reactions to these stressors is less clear. This is puzzling, because 2 closely related areas, the septum and the amygdala, have been repeatedly implicated in fear behaviors. To investigate further, the(More)
Recent findings implicate the prefrontal cortex (PFC) and, in particular, frontocortical dopamine acting at D1-like receptors, in working memory. However, the mechanisms underlying this function of dopamine remain unknown. The present studies evaluated the hypothesis that dopamine contributes to working memory through its action on the 2nd messenger cyclic(More)
The co-abuse of marijuana with cocaine is widespread, but it has not been until recently that the relationship between the behavioral effects of cannabinoids and cocaine has begun to be unveiled in animal models. Male Wistar rats were trained to intravenously self-administer cocaine until a stable baseline was reached. Rats then were subjected to a 5-day(More)
Anxiety is a key consequence of ethanol withdrawal and important risk factor for relapse. The neuropeptide nociceptin/orphanin FQ (N/OFQ) or agonists at this peptide's receptor (NOP) exert anxiolytic-like and antistress actions. N/OFQ dysfunction has been linked to both a high-anxiety behavioral phenotype and excessive ethanol intake. Recent studies suggest(More)
Previously we reported that systemic administration of the dopamine D3 receptor-preferring partial agonist BP 897 blocked the expression, but not the acquisition, of amphetamine-conditioned activity. This suggested the hypothesis that BP 897 would block the expression, but not the acquisition, of amphetamine-conditioned place preference (CPP). Thus, during(More)
Contextual stimuli present during a single lifetime cocaine self-administration experience acquire occasion-setting actions sufficient to persistently elicit cocaine-seeking behavior in rats, with effects lasting nearly 1 year. The goal of this study was to identify neural substrates mediating the acquisition of drug-related conditioning taking place during(More)
Growing evidence suggests a role for sigma(1) (sigma(1)) receptors in cognitive function, anxiety, depression, regulation of stress responses, and, recently, the appetitive effects of cocaine as measured by conditioned place preference. This study was designed to extend understanding of the role of sigma(1) receptors in addiction-relevant conditioned(More)