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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

5-Isothiocyanato-2-benzofuranyl-2-imidazoline (BU99006) an irreversible imidazoline(2) binding site ligand: in vitro and in vivo characterisation in rat brain.

5-Isothiocyanato-2-benzofuranyl-2-imidazoline (BU99006) is an irreversible ligand based on the highly selective I(2) binding site ligand 2BFI. In competition binding assays it has been shown to have high affinity and selectivity for the I(2) binding site and to irreversibly inhibit the binding of [(3)H]2BFI. In this present study we have sought to confirm and expand on these findings both in vitro and in vivo. In vitro pre-incubation of rat whole brain membranes with BU99006 (10 microM) was shown to reduce the specific binding of [(3)H]2BFI to 10% of the control values, an effect not seen using 2BFI or BU224. Pre-treatment of rat whole brain membranes by BU99006, or by the alpha(2)-adrenoceptor antagonists RX821002 or rauwolscine had no effect on the specific binding of [(3)H]RX821002. In vivo pre-treatment of rats with BU99006 (15 mg x kg(-1), i.v.) caused a substantial loss of [(3)H]2BFI specific binding in subsequent in vitro saturation analysis and autoradiography; this loss was shown to be dose dependent. These data indicate that BU99006 is selectively and irreversibly affecting I(2) binding sites both in vitro and in vivo and that it represents an invaluable tool in the further understanding of the I(2) binding site.[1]


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