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- W2005171493 abstract "[125I]Iodobolpyramine is a novel 125I-ligand for histamine H1-receptors, synthesised using the 125I-Bolton Hunter reagent (2000 Ci/mmol) for acylation of an aminopentyl analogue of mepyramine. Its specific binding varied linearly with the concentration of guinea-pig cerebellar membranes and represented about 80% of the total. Selective interaction with H1-receptors was demonstrated by estimation of Ki values of known agonists and antagonists and confirmed by the low affinity of histamine H2- and H3-receptor antagonists and of non-histaminergic agents. At 25 degrees C, [125I]iodobolpyramine exhibited a slow association rate (180-240 min to reach equilibrium) and a slow dissociation rate (t1/2 = 201 min). Kinetic and saturation data yielded KD values of 0.05 and 0.15 nM, respectively, indicating that it is among the most potent H1-receptor antagonists known. The sensitivity for detecting H1-receptors in guinea-pig cerebellum using [125I]iodobolpyramine was increased 50-fold relative to use of [3H]mepyramine. Well-contrasted autoradiograms of guinea-pig brain, obtained after a short exposure time, confirmed previous H1-receptor localisation established with [3H]mepyramine and revealed new localisations, e.g. in cerebral cortex and nucleus accumbens." @default.
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- W2005171493 date "1986-01-01" @default.
- W2005171493 modified "2023-09-27" @default.
- W2005171493 title "[125I]iodobolpyramine, a highly sensitive probe for histamine H1-receptors in guinea-pig brain" @default.
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- W2005171493 doi "https://doi.org/10.1016/0014-2999(86)90535-2" @default.
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