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• W2313238879 abstract "Previous studies have shown that nicotine modulates GABAergic transmission onto dopaminergic (DAergic) neurons in the substantia nigra pars compacta (SNc) mainly via presynaptic mechanisms. However, nicotinic modulation of postsynaptic GABAA receptor function in SNc DAergic neurons is unknown. Employing patch-clamp recording technique in single putative DAergic neurons freshly dissociated from rat SNc, we found that functional α4β2-nAChRs were well expressed on majority (77%) of putative SNc DAergic neurons recorded (type ID neurons), while functional α7-nAChRs were only detected in 23% of recorded putative SNc DAergic neurons (type IID neurons). Smoking relevant concentration of nicotine reversibly increased the amplitude of GABAA receptor-mediated wholecellcurrents in 63% of type ID neurons expressing α4β2-nAChRs, but not in those type IID neurons expressing α7-nAChRs, which suggests that postsynaptic GABAA receptors on putative SNc DAergic neurons that contain nAChR α4β2 subunits are significantly modulated by nicotine. Interestingly, nicotine at concentrations from 1 nM to 10 μM produced concentration-independent enhancement effects on GABAA receptor-mediated currents. There was no significant influence of pretreatment with either DHβE (a selective α4β2-nAChR antagonist) or 500 nM nicotine over the nicotinic modulation. In addition, 500 nM nicotine did not affect glutamate or glycine-induced current under our experimental conditions. Collectively, our results suggest that nicotine directly boosts the function of postsynapticGABAA receptors, which in turn results in hyperpolarization and reduced excitability of putative SNc DAergic neurons through novel α4β2-nAChR-dependent pathways and/or additional postsynaptic mechanisms." @default.
• W2313238879 created "2016-06-24" @default.
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• W2313238879 date "2013-01-01" @default.
• W2313238879 modified "2023-10-16" @default.
• W2313238879 title "Nicotinic Modulation of GABAA Receptor Function in Single Dopaminergic Neurons Freshly-Dissociated from Rat Substantia Nigra Pars Compacta" @default.
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• W2313238879 doi "https://doi.org/10.4172/2167-0501.s1-003" @default.
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