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Allosteric modulation of G protein-coupled receptors has recently been recognized as an alternative approach for selectivity in drug action. Allosteric modulators that enhance or diminish the effects of (endogenous) agonists or antagonists on a variety of G protein-coupled receptors are described in this review, with emphasis on the latest developments in(More)
Structure-affinity relationship (SAR) studies for the 5-HT1A receptor site are presented for two series of heterobicyclic phenylpiperazines with N4-aralkyl substituents: 4-aralkyl derivatives of 1-(2,3-dihydro-1,4-benzodioxin-5-yl)piperazine (3) and 1-(benzo[b]furan-7-yl)piperazine (4). Their affinities for 5-HT1A receptors range from 0.15 to 28 nM and thus(More)
The present paper reviews the evidence for anxiolytic activity of 5-HT(3) receptor antagonists in animal models of anxiety and in clinical trials in humans. Compared to the established anxiolytics (benzodiazepine receptor agonists and, to a lesser extent, 5-HT(1A) receptor agonists) 5-HT(3) receptor antagonists display a different anxiolytic profile. They(More)
GABA is the major inhibitory neurotransmitter in the brain and GABA re- uptake from the synaptic cleft is one important mechanism in the regulation of GABA activity. Inhibition of the re-uptake of GABA by potent and selective inhibitors of the GABA transporter enhances GABA activity. This property can be used therapeutically in for instance epilepsy or(More)
An overview is presented on progress made in research on 5-HT1A receptors and their ligands since their discovery in 1983. Molecular biology has offered new tools, for example cloned 5-HT1A receptors, their mutants and chimeras to study structure and function. Many compounds, belonging to different chemical classes, display high affinity and selectivity for(More)
An overview is presented on progress made in the research on neuronal transporters of serotonin, dopamine and norepinephrine in the central nervous system. Tools developed by molecular biology, such as expression of cloned transporters, their mutants and chimera in non-neuronal cells offered the opportunity to study the putative domains for binding of(More)
The electrostatic properties of adenosine-based agonists and xanthine-based antagonists for the adenosine A1 receptor were used to assess various proposals for their relative orientation in the unknown binding site. The electrostatic properties were calculated from distributed multipole representations of SCF wavefunctions. A range of methods of assessing(More)
Amiloride, a potassium sparing diuretic, inhibits adenosine A1 receptor-radioligand binding in calf and rat brain membranes in the low micromolar range. The drug interacted with the A1 receptor in a manner different from classical A1 ligands, but structure-activity relationship studies indicated that this inhibitory effect is not related to the ion(More)