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- W2094295295 abstract "Fast-scan cyclic voltammetry was used to simultaneously measure increases in dopamine concentration and decreases in O2 concentration evoked by brief electrical stimulation (two pulses at 10 Hz) in slices of rat caudate nucleus. Dopamine concentration began increasing immediately after the first pulse and reached a maximum within 200 ms of stimulation. The O2 concentration began to decrease 300–700 ms after onset of stimulus. Responses for both dopamine and O2 were dependent on external Ca2+ and were Cd2+ and tetrodotoxin sensitive. Only the O2 response was sensitive to CN− (0.15 mM). At short times after exposure to 50 μM ouabain, electrically stimulated dopamine overflow was increased by 150% and electrically stimulated changes in O2 concentration were unaffected. Maximum dopamine concentration was increased 28% by sulpiride (2 μM), 78% byl-DOPA (60 μM), 105% by nomifensine (10 μM) and unaffected by nialamide (10 μM). Maximum decrease in O2 concentration was increased by 25% by sulpiride and unaffected by nialamide,l-DOPA, or nomifensine. The decreases in O2 concentration are indicative of increased O2 consumption and are a measure of oxidative energy production evoked by electrical stimulation. The increase in dopamine is due to the release of dopamine balanced by uptake and serves as an indication of neurotransmitter activity. The results indicate that increases in oxidative energy production following electrical stimulation are dependent on external Ca2+ entry through Cd2+-sensitive channels. Possible mechanisms for this coupling are discussed." @default.
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- W2094295295 date "1992-04-01" @default.
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- W2094295295 title "Simultaneous measurement of oxygen and dopamine: Coupling of oxygen consumption and neurotransmission" @default.
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- W2094295295 doi "https://doi.org/10.1016/0306-4522(92)90169-3" @default.
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