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- W4200103632 abstract "Dysfunction of the central dopamine D2-receptor-related network has been proposed to play a critical role in dopamine-related diseases, such as schizophrenia and drug dependence. Generally, the stimulation of dopamine D2-receptors on medium spiny neurons (MSN) induces several behavioral effects, such as sedation, hallucination, aversion and motivation. Furthermore, such physiological responses through dopamine D2-receptor-containing MSN (D2-MSN) may be synchronized with the activity of dopamine D1-receptor-containing MSN (D1-MSN), or both may exhibit dual agonistic/antagonistic innervation. In the present study, we characterized the discriminative stimulus effect of the selective dopamine D2-receptor agonist quinpirole to further investigate the D1/D2-MSN interaction using dopamine-related agents, hallucinogens and sedatives in rats. Among dopamine receptor agonists, only selective dopamine D2-receptor agonists substituted for the discriminative stimulus effects of quinpirole. Neither the δ-opioid receptor agonist SNC80 nor the adenosine A2A-receptor antagonist istradefylline, both of which may act on D2-MSNs, substituted for the discriminative stimulus effects of quinpirole. Interestingly, the dopamine D1-receptor antagonist SCH23390 and the GABAB-receptor agonist baclofen, but not hallucinogens or sedatives, substituted for the discriminative stimulus effects of quinpirole. These results suggest that stimulation of central dopamine D2-receptors exerts a distinct discriminative stimulus effect, and blockade of dopamine D1-receptors and agonistic modulation of GABAB-receptors may share the discriminative stimulus effect via the activation of central dopamine D2-receptors." @default.
- W4200103632 created "2021-12-31" @default.
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- W4200103632 date "2022-02-01" @default.
- W4200103632 modified "2023-09-27" @default.
- W4200103632 title "Characterization of the discriminative stimulus effect of quinpirole: Further evidence for functional interaction between central dopamine D1/D2-receptors" @default.
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- W4200103632 doi "https://doi.org/10.1016/j.pbb.2021.173314" @default.
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