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• W2091898082 abstract "1. The effects of sibutramine (0.25 - 10 mg kg-1, i.p.) on extracellular noradrenaline concentration in the frontal cortex of halothane-anaesthetized rats were compared with those of d-amphetamine (1 - 3 mg kg-1, i.p.) using in vivo microdialysis. The role of presynaptic alpha2-adrenoceptors in modulating the effects of these drugs on extracellular noradrenaline concentration were also investigated by pretreating rats with the selective alpha2-adrenoceptor antagonist, RX821002. 2. Sibutramine induced a gradual and sustained increase in extracellular noradrenaline concentration. The dose-response relationship was described by a bell-shaped curve with a maximum effect at 0.5 mg kg-1. In contrast, d-amphetamine induced a rapid increase in extracellular noradrenaline concentration, the magnitude of which paralleled drug dose. 3. Pretreatment with the alpha2-adrenoceptor antagonist, RX821002 (dose 3 mg kg-1, i.p.) increased by 5 fold the accumulation of extracellular noradrenaline caused by sibutramine (10 mg kg-1) and reduced the latency of sibutramine to reach its maximum effect from 144 - 56 min. 4. RX821002-pretreatment increased by only 2.5 fold the increase in extracellular noradrenaline concentration caused by d-amphetamine alone (10 mg kg-1) and had no effect on the latency to reach maximum. 5. These findings support evidence that sibutramine acts as a noradrenaline uptake inhibitor in vivo and that the effects of this drug are blunted by indirect activation of presynaptic alpha2-adreno-ceptors. In contrast, the rapid increase in extracellular noradrenaline concentration induced by d-amphetamine is consistent with this being mainly due to an increase in Ca2+-independent release of noradrenaline." @default.
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• W2091898082 date "1999-08-01" @default.
• W2091898082 modified "2023-10-16" @default.
• W2091898082 title "Comparison of changes in the extracellular concentration of noradrenaline in rat frontal cortex induced by sibutramine or d -amphetamine: modulation by α2 -adrenoceptors" @default.
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• W2091898082 doi "https://doi.org/10.1038/sj.bjp.0702720" @default.
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