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• W3204106422 abstract "Stress-induced release of dynorphins (Dyn) activates kappa opioid receptors (KOR) in serotonergic neurons to produce dysphoria and potentiate drug reward; however, the circuit mechanisms responsible for this effect are not known. In male mice, we found that conditional deletion of KOR from Slc6a4 (SERT)-expressing neurons blocked stress-induced potentiation of cocaine conditioned place preference (CPP). Within the dorsal raphe nucleus (DRN), two overlapping populations of KOR-expressing neurons: Slc17a8 (VGluT3) and SERT, were distinguished functionally and anatomically. Optogenetic inhibition of these SERT+ neurons potentiated subsequent cocaine CPP, whereas optical inhibition of the VGluT3+ neurons blocked subsequent cocaine CPP. SERT+/VGluT3− expressing neurons were concentrated in the lateral aspect of the DRN. SERT projections from the DRN were observed in the medial nucleus accumbens (mNAc), but VGluT3 projections were not. Optical inhibition of SERT+ neurons produced place aversion, whereas optical stimulation of SERT+ terminals in the mNAc attenuated stress-induced increases in forced swim immobility and subsequent cocaine CPP. KOR neurons projecting to mNAc were confined to the lateral aspect of the DRN, and the principal source of dynorphinergic (Pdyn) afferents in the mNAc was from local neurons. Excision of Pdyn from the mNAc blocked stress-potentiation of cocaine CPP. Prior studies suggested that stress-induced dynorphin release within the mNAc activates KOR to potentiate cocaine preference by a reduction in 5-HT tone. Consistent with this hypothesis, a transient pharmacological blockade of mNAc 5-HT1B receptors potentiated subsequent cocaine CPP. 5-HT1B is known to be expressed on 5-HT terminals in NAc, and 5-HT1B transcript was also detected in Pdyn+, Adora2a+ and ChAT+ (markers for direct pathway, indirect pathway, and cholinergic interneurons, respectively). Following stress exposure, 5-HT1B transcript was selectively elevated in Pdyn+ cells of the mNAc. These findings suggest that Dyn/KOR regulates serotonin activation of 5HT1B receptors within the mNAc and dynamically controls stress response, affect, and drug reward." @default.
• W3204106422 created "2021-10-11" @default.
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• W3204106422 date "2021-09-25" @default.
• W3204106422 modified "2023-10-16" @default.
• W3204106422 title "Stress decreases serotonin tone in the nucleus accumbens in male mice to promote aversion and potentiate cocaine preference via decreased stimulation of 5-HT1B receptors" @default.
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• W3204106422 doi "https://doi.org/10.1038/s41386-021-01178-0" @default.
• W3204106422 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34564712" @default.
• W3204106422 hasPublicationYear "2021" @default.
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