In addition, activation of SK-channels by T-type Ca2+ channels was also observed in voltage-clamp experiments, suggesting that these channels find more could activate SK channels in other circumstances than during the mAHP, for example during synaptic activity. We wish to thank Professor Martin W. Wessendorf (University of Minnesota, Mineapolis, USA) and Melissa Doupagne and Laurence de Nijs (GIGA Neurosciences, University of Liège) for their advice regarding immunostaining of dorsal raphe neurons in thick slices, and Dr Stanislav Koulchitsky (GIGA Neurosciences, University of Liège) for his help with statistical analysis. We also acknowledge Professor J. Roeper (Goethe University, Frankfurt, Germany) for his

useful comments on an earlier version of the manuscript. This work was supported by grants nos 9.4560.03 and 3.4533.09 from the F.R.S.-FNRS (V.S.), PI3K inhibitor by a grant from the Belgian Science Policy (IAP P7/10) to V.S. and by a grant from the ‘Fonds Spéciaux de la Recherche’ of the University of Liège (V.S.). P.A. was supported by an ‘Assistant’ mandate of the University of Liège. C.A.C. is a Research Associate of the F.R.S.-FNRS of the French speaking Community of Belgium. The authors have no conflict of interest to declare. Abbreviations ACSF artificial cerebrospinal fluid BMI bicuculline methiodide DBHQ 2,5-di(tert-butyl)hydroquinone DRN dorsal raphe nucleus mAHP medium-duration afterhyperpolarization

PBS phosphate-buffered sucrose SK small-conductance Ca2+-activated (or

KCa2.x) TEA tetraethylammonium TPH tryptophan hydroxylase TTA-P2 3,5-dichloro-N-[1-(2,2-dimethyl-tetrahydro-pyran-4-ylmethyl)-4-fluoro-piperidin-4-ylmethyl]-benzamide “
“Previous research has shown that the basolateral amygdala (BLA) mediates stimulus-reward learning, including drug-cue associations, whereas the dorsolateral caudate putamen (dlCPu) primarily mediates stimulus-response (habit) learning. Recent evidence Avelestat (AZD9668) has indicated that the dlCPu may be critical in cocaine-seeking following extended self-administration, but it remains unknown whether the dlCPu plays a role in the early formation of drug-cue associations. The current study used a model of Pavlovian learning to compare the roles of the BLA and dlCPu in the consolidation of cocaine-cue associations that maintain cocaine-seeking during cue-induced reinstatement. Male Sprague-Dawley rats self-administered cocaine (0.2 mg/50 μL infusion, i.v.) in the absence of cues for 6 days (2 h/day). Immediately following a single 1-h classical conditioning session in which passive cocaine infusions were paired with a light/tone cue, animals received bilateral infusions of the GABA receptor agonists, baclofen/muscimol (1.0/0.1 mm), or vehicle into the BLA or dlCPu. Following additional cocaine self-administration (5 days) and subsequent extinction (no cocaine or cues, 7 days), the ability of the previously cocaine-paired cues to reinstate cocaine-seeking was assessed.