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The present study reinvestigates the role of autoinhibition in dopamine (DA) release from mesoprefrontal and nigrostriatal DA neurons using improved methodology. Slices of rabbit prefrontal cortex (PFC) and striatum (STR) were labeled with [3H]DA and superfused in the presence of nomifensine (3 microM). Overflow was elicited by field stimulation with a(More)
This study explores the role of cyclic AMP in electrically evoked [3H]noradrenaline release and in the alpha 2-adrenergic modulation of this release in chick sympathetic neurons. Along with an increase in stimulation-evoked tritium overflow, applications of forskolin enhanced the formation of intracellular cyclic AMP. Both effects of forskolin were(More)
1. The release of previously incorporated [3H]-noradrenaline was investigated in cultures of dissociated chick or rat sympathetic neurones and in cerebrocortical slices from neonatal or adult rats. Noradrenaline, in the presence of 10 mumol l-1 of the uptake inhibitor, cocaine, or the selective alpha 2-adrenoceptor agonist,(More)
Whether amphetamine enhances noradrenergic activity by uptake blockade or a releasing action is still a matter of debate. In order to gain insight into the interaction of amphetamine with the noradrenaline transporter its cDNA was transfected into COS-7 cells (NAT-cells) or cotransfected with the cDNA of the vesicular monoamine transporter (NAT/VMAT-cells);(More)
N-methyl D-aspartate (NMDA)-antagonists decrease neurotoxicity by inhibiting Ca2+ influx which is of interest for the treatment of acute cerebrovascular insults and chronic neurodegenerative disorders. Currently, there is no surrogate marker for quantification of NMDA-receptor-mediated drug effects, which hampers dose-finding clinical studies. As prolactin(More)
1. COS-7 cells transfected with the cDNA of the human dopamine transporter (DAT cells) or the human noradrenaline transporter (NAT cells) were loaded with [3H]-dopamine or [3H]-noradrenaline and superfused with buffers of different ionic composition. 2. In DAT cells lowering the Na+ concentration to 0, 5 or 10 mM caused an increase in 3H-efflux. Cocaine (10(More)
Secretoneurin (SN) is a neuropeptide derived from secretogranin II that is found in brain and endocrine tissues. The aim of the present study was to determine the influence of this novel peptide on dopamine (DA) release from rat striatum using the microdialysis technique. Rat SN (1-30 mumol/L added to the dialysis buffer) enhanced DA outflow of awake rats(More)
In the present study a mixture of a full agonist (noradrenaline) and a full antagonist (yohimbine) was used to mimic the effects of a partial agonist (clonidine) on alpha 2-autoreceptor-mediated regulation of noradrenaline release in order to learn more about the shape of concentration-response curves in the absence and presence of spare receptors. The(More)
1. Rats received an intraperitoneal injection of 1.6 mg kg-1 N-ethoxycarbonyl-2-ethoxy-1,2-dihydroquinoline (EEDQ) to achieve an irreversible inactivation of presynaptic release-modulating alpha 2-autoreceptors. Cerebral cortex slices were prepared at different times after the injection (24, 48, 96, 192, 336, 774 h), incubated with [3H]-noradrenaline(More)
The aim of the present study was to determine the local concentrations of noradrenaline existing at presynaptic alpha 2-adrenoceptors during electrical pulse train stimulation of brain slices at different frequencies. The experiments are based on the assumption that the concentration of released noradrenaline at the alpha 2-adrenoceptors exerting a certain(More)