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• W2020176800 abstract "We have used cocaine-conditioned locomotion in rats as an animal model for cocaine-conditioned responses that contribute to drug craving and relapse in human addicts. The purpose of the present study was to examine the ability of the GABA(B) agonist, baclofen, to attenuate such associative responses. First, experiments were conducted to identify a dose range of baclofen that did not impede exploratory or spontaneous behavior. This dose range was used during testing for conditioned locomotion specific to a flashing light and metronome, which were previously associated with administration of cocaine (PAIRED group) or saline (UNPAIRED group). At 2.0 mg/kg, baclofen attenuated conditioned locomotion in PAIRED subjects to the level of UNPAIRED subjects receiving saline or 2.0 mg/kg baclofen. Considering the importance of glutamate transmission in the nucleus accumbens (NAc) during associative responses to reward-related stimuli, the effect of baclofen on extracellular levels of glutamate in the NAc was tested with microdialysis. Baclofen (2.0 mg/kg) did not alter basal glutamate levels. However, baclofen pretreatment prevented the predatory odor, 2,5-dihydro-2,4,5-trimethylthiazoline, from increasing glutamate levels. This is the first report of baclofen modulating extracellular levels of glutamate in the NAc. Baclofen may prove to have general utility for suppressing stimulus-evoked increases in NAc glutamate levels. This could explain its ability to prevent cocaine-conditioned responses. In summary, our results suggest that enhancing GABA(B) transmission inhibits cocaine-conditioned responses, possibly by suppressing glutamate transmission in the NAc. A better understanding of interactions between GABA and glutamate transmission in the NAc may lead to the development of pharmacotherapies for cocaine craving." @default.
• W2020176800 created "2016-06-24" @default.
• W2020176800 creator A5022853815 @default.
• W2020176800 creator A5030222701 @default.
• W2020176800 date "2003-04-01" @default.
• W2020176800 modified "2023-10-10" @default.
• W2020176800 title "Baclofen attenuates conditioned locomotion to cues associated with cocaine administration and stabilizes extracellular glutamate levels in rat nucleus accumbens" @default.
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• W2020176800 doi "https://doi.org/10.1016/s0306-4522(02)00951-x" @default.
• W2020176800 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12676144" @default.
• W2020176800 hasPublicationYear "2003" @default.
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