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• W2124178069 startingPage "3775" @default.
• W2124178069 abstract "The midbrain ventral tegmental area (VTA) contains neurons largely with either a dopaminergic (DAergic) or GABAergic phenotype. Physiological and pharmacological properties of DAergic neurons have been determined using tyrosine hydroxylase (TH) immunohistochemistry but many properties overlap with non-DAergic neurons presumed to be GABAergic. This study examined properties of GABAergic neurons, non-GABAergic neurons and TH-immunopositive neurons in VTA of GAD67-GFP knock-in mice. Ninety-eight per cent of VTA neurons were either GAD-GFP or TH positive,with the latter being five times more abundant. During cell-attached patch-clamp recordings, GAD-GFP neurons fired brief action potentials that could be completely distinguished from those of non-GFP neurons. Pharmacologically, the μ-opioid agonist DAMGO inhibited firing of action potentials in 92% of GAD-GFP neurons but had no effect in non-GFP neurons. By contrast, dopamine invariably inhibited action potentials in non-GFP neurons but only did so in 8% of GAD-GFP neurons. During whole-cell recordings, the narrower width of action potential in GAD-GFP neurons was also evident but there was considerable overlap with non-GFP neurons. GAD-GFP neurons invariably failed to exhibit the potassium-mediated slow depolarizing potential during injection of positive current that was present in all non-GFP neurons. Under voltage-clamp the cationic current, I(h), was found in both types of neurons with considerable overlap in both amplitude and kinetics. These distinct cellular properties may thus be used to confidently discriminate GABAergic and DAergic neurons in VTA during in vitro electrophysiological recordings." @default.
• W2124178069 created "2016-06-24" @default.
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• W2124178069 date "2011-07-28" @default.
• W2124178069 modified "2023-10-16" @default.
• W2124178069 title "Distinct cellular properties of identified dopaminergic and GABAergic neurons in the mouse ventral tegmental area" @default.
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• W2124178069 doi "https://doi.org/10.1113/jphysiol.2011.210807" @default.
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