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• W2007276710 abstract "1 We have provided evidence for a novel amine uptake process for which prazosin is a substrate in postsynaptic neurones, characterized by a paradoxical increase in accumulation of the radioligand when the concentration of the unlabelled drug is increased above 10−7 m. This increase is due to activation of a proton-dependent, vacuolar type-ATPase-linked uptake process which is blocked by desipramine but is resistant to reserpine. We have now examined the effects of tricyclic antidepressants on this uptake system in a cell line derived from hypothalamic peptidergic neurones, known to be innervated by noradrenergic nerve terminals in vivo. 2 [3H]-imipramine bound to the cells and was displaced by unlabelled imipramine, desipramine, amitriptyline and nortriptyline. The data fitted a single binding site model. This is the first demonstration of antidepressant binding sites in postsynaptic neurones. 3 There was no increase in the binding of [3H]-imipramine at high concentrations of unlabelled imipramine, suggesting that antidepressants inhibit uptake but are not themselves accumulated by peptidergic gonadotrophin releasing hormone neurones. 4 Accumulation of prazosin was competitively inhibited by antidepressants. Tertiary amines were slightly more potent than secondary amines and the presence of a nitrogen atom in the heterocyclic ring enhanced blocking activity. 5 The affinities of the antidepressants for the uptake process are within the range of plasma concentrations that are observed during therapeutic use of these compounds. Since it is likely that this uptake process has a physiological function, its inhibition by antidepressants may provide a new avenue for investigating the mechanism of action of these compounds." @default.
• W2007276710 created "2016-06-24" @default.
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• W2007276710 creator A5051902465 @default.
• W2007276710 date "1996-03-01" @default.
• W2007276710 modified "2023-09-24" @default.
• W2007276710 title "Binding and competitive inhibition of amine uptake at postsynaptic neurones (transport-P) by tricyclic antidepressants" @default.
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• W2007276710 doi "https://doi.org/10.1111/j.1476-5381.1996.tb15265.x" @default.
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