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• W3176728633 abstract "In the brain, extrasynaptically expressed ionotropic, δ subunit-containing γ-aminobutyric acid A-type receptors (δ-GABA A Rs) have been implicated in drug effects at both neuronal and behavioral levels. These alterations are supposed to be caused via drug-induced modulation of receptor ionophores affecting chloride ion-mediated inhibitory tonic currents. Often, a transgenic mouse model genetically lacking the δ-GABA A Rs (δ-KO) has been used to study the roles of δ-GABA A Rs in brain functions, because a specific antagonist of the δ-GABA A Rs is still lacking. We have previously observed with these δ-KO mice that activation of δ-GABA A Rs is needed for morphine-induced conditioning of place preference, and others have suggested that δ-GABA A Rs act as targets selectively for low doses of ethanol. Furthermore, activation of these receptors via drug-mediated agonism induces a robust increase in the slow-wave frequency bands of electroencephalography (EEG). Here, we tested δ-KO mice (compared to littermate wild-type controls) for the pharmaco-EEG responses of a broad spectrum of pharmacologically different drug classes, including alcohol, opioids, stimulants, and psychedelics. Gaboxadol (THIP), a known superagonist of δ-GABA A Rs, was included as the positive control, and as expected, δ-KO mice produced a blunted pharmaco-EEG response to 6 mg/kg THIP. Pharmaco-EEGs showed notable differences between treatments but also differences between δ-KO mice and their wild-type littermates. Interestingly mephedrone (4-MMC, 5 mg/kg), an amphetamine-like stimulant, had reduced effects in the δ-KO mice. The responses to ethanol (1 g/kg), LSD (0.2 mg/kg), and morphine (20 mg/kg) were similar in δ-KO and wild-type mice. Since stimulants are not known to act on δ-GABA A Rs, our findings on pharmaco-EEG effects of 4-MMC suggest that δ-GABA A Rs are involved in the secondary indirect regulation of the brain rhythms after 4-MMC." @default.
• W3176728633 created "2021-07-05" @default.
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• W3176728633 date "2021-06-21" @default.
• W3176728633 modified "2023-09-25" @default.
• W3176728633 title "Mice Lacking GABAA Receptor δ Subunit Have Altered Pharmaco-EEG Responses to Multiple Drugs" @default.
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• W3176728633 doi "https://doi.org/10.3389/fphar.2021.706894" @default.
• W3176728633 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8255781" @default.
• W3176728633 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34234684" @default.
• W3176728633 hasPublicationYear "2021" @default.
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