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• W1985444891 abstract "A selective competitive binding assay for the determination of the affinity of compounds to the human σ(2) receptor using 96-well multiplates and a solid state scintillator was developed. In the assay system, [(3)H]ditolylguanidine (DTG) was used as radioligand and membrane homogenates from human RT-4 cells physiologically expressing σ(2) receptors served as receptor material. In order to block the interaction of the unselective radioligand [(3)H]DTG with σ(1) receptors, all experiments were performed in the presence of the σ(1) selective ligand (+)-pentazocine. The density of σ(2) receptors of the cells was analyzed by a saturation experiment with [(3)H]DTG. The radioligand [(3)H]DTG was bound to a single, saturable site on human σ(2) receptors, resulting in a B(max) value of 2108±162fmol/mg protein and K(d)-value of 8.3±2.0nM. The expression of competing σ(1) receptors was evaluated by performing a saturation experiment using the σ(1) selective radioligand [(3)H](+)-pentazocine, which resulted in a B(max) value of 279±40fmol/mg protein and K(d) value of 13.4±1.6nM. For validation of the σ(2) binding assay, the K(i)-values of four σ(2) ligands (ditolylguanidine, haloperidol, rimczole and BMY-14802) were determined with RT-4 cell membrane preparations. The K(i) values obtained from these experiments are in good accordance with the K(i)-values obtained with rat liver membrane preparations as receptor material and with K(i) values given in the literature." @default.
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• W1985444891 date "2011-07-01" @default.
• W1985444891 modified "2023-09-25" @default.
• W1985444891 title "Expression of σ receptors of human urinary bladder tumor cells (RT-4 cells) and development of a competitive receptor binding assay for the determination of ligand affinity to human σ2 receptors" @default.
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• W1985444891 doi "https://doi.org/10.1016/j.jpba.2011.03.044" @default.
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