Abstract
Rationale
Cocaine produces significant aversive/anxiogenic actions whose underlying neurobiology remains unclear. A possible substrate contributing to these actions is the serotonergic (5-HT) pathway projecting from the dorsal raphé (DRN) to regions of the extended amygdala, including the bed nucleus of the stria terminalis (BNST) which have been implicated in the production of anxiogenic states.
Objectives
The present study examined the contribution of 5-HT signaling within the BNST to the anxiogenic effects of cocaine as measured in a runway model of drug self-administration.
Methods
Male Sprague–Dawley rats were fitted with bilateral infusion cannula aimed at the BNST and then trained to traverse a straight alley once a day for a single 1 mg/kg i.v. cocaine infusion delivered upon goal-box entry on each of 16 consecutive days/trials. Intracranial infusions of CP 94,253 (0, 0.25, 0.5, or 1.0 μg/side) were administered to inhibit local 5-HT release via activation of 5-HT1B autoreceptors. To confirm receptor specificity, the effects of this treatment were then challenged by co-administration of the selective 5-HT1B antagonist NAS-181.
Results
Intra-BNST infusions of the 5-HT1B autoreceptor agonist attenuated the anxiogenic effects of cocaine as reflected by a decrease in runway approach-avoidance conflict behavior. This effect was reversed by the 5-HT1B antagonist. Neither start latencies (a measure of the subject’s motivation to seek cocaine) nor spontaneous locomotor activity (an index of motoric capacity) were altered by either treatment.
Conclusions
Inhibition of 5-HT1B signaling within the BNST selectively attenuated the anxiogenic effects of cocaine, while leaving unaffected the positive incentive properties of the drug.
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Acknowledgements
The authors wish to thank Dr. Kerisa Shelton for her assistance throughout the project. This work was funded by NIDA grant DA03370 awarded to AE.
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Klein, A.K., Brito, M.A., Akhavan, S. et al. Attenuation of the anxiogenic effects of cocaine by 5-HT1B autoreceptor stimulation in the bed nucleus of the stria terminalis of rats. Psychopharmacology 234, 485–495 (2017). https://doi.org/10.1007/s00213-016-4479-3
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DOI: https://doi.org/10.1007/s00213-016-4479-3