Abstract
One of the current hypotheses on dopamine in the physiology of motivation posits that this neurotransmitter regulates filtering and selection of inputs to the nucleus accumbens. The effects of dopamine (100 microM) and the D1-receptor agonist SKF 38393 (20-50 microM) on GABAergic synaptic transmission between pairs of principal cells of rat nucleus accumbens were studied by using simultaneous dual patch-clamp recordings in acutely prepared brain slices. Both compounds attenuated postsynaptic responses induced by presynaptic firing and this effect was reversed by the D1-receptor antagonist SCH 23390 (25 microM). This attenuating effect of dopamine D1-receptors may act to diminish competitive interactions between single projection neurons or ensembles in the nucleus accumbens.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine / pharmacology
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Animals
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Benzazepines / pharmacology
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Dopamine / pharmacology
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Dose-Response Relationship, Drug
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Drug Interactions
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Functional Laterality / physiology*
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Lysine / analogs & derivatives*
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Lysine / metabolism
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Male
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Neural Inhibition / drug effects
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Neural Inhibition / physiology*
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Neurons / classification
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Neurons / drug effects
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Neurons / physiology*
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Nucleus Accumbens / cytology*
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Rats
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Rats, Wistar
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Receptors, Dopamine D1 / agonists
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Receptors, Dopamine D1 / antagonists & inhibitors
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Receptors, Dopamine D1 / physiology*
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Synaptic Transmission / drug effects
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Synaptic Transmission / physiology
Substances
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Benzazepines
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Receptors, Dopamine D1
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2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine
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biocytin
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Lysine
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Dopamine