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  • Title: Characterization of [3H]paroxetine binding to rat cortical membranes.
    Author: Habert E, Graham D, Tahraoui L, Claustre Y, Langer SZ.
    Journal: Eur J Pharmacol; 1985 Nov 26; 118(1-2):107-14. PubMed ID: 2935409.
    Abstract:
    Paroxetine is a selective and potent inhibitor of 5-hydroxytryptamine uptake into serotonergic neurons. The specific binding of [3H]paroxetine to rat cortical membranes at 22 degrees C was examined in this study. Our results indicate the presence of a single saturable high affinity binding component for [3H]paroxetine. Scatchard analysis revealed a Kd of 0.15 +/- 0.01 nM, and a Bmax of 549 +/- 36 fmol/mg protein. The kinetically derived dissociation constant was 0.034 +/- 0.008 nM. [3H]Paroxetine binding was inhibited selectively by 5-HT uptake blockers, and a good correlation was demonstrated between the potency of various drugs to inhibit [3H]paroxetine binding and [3H]5-hydroxytryptamine uptake. Also, lesions performed with the neurotoxin, 5,7-dihydroxytryptamine resulted in a 94% decrease in endogenous 5-hydroxytryptamine levels and concomitantly, a 90% reduction in [3H]paroxetine binding when compared to sham controls. These results indicate that the binding site labelled by [3H]paroxetine is associated with the neuronal 5-hydroxytryptamine transporter complex.
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