[3H]Imipramine binding and [3H]5HT uptake in human blood platelets: changes after one week chlorimipramine treatment.
In platelets of normal volunteers taking chlorimipramine (50 mg/day) for one week, the saturable uptake of [3H]5HT was fully inhibited at day 8, but returned to control values at day 15. The Bmax of [3H]imipramine binding was decreased by 65% at day 8 and remained significantly below control values at day 15. If the present findings can be extrapolated to other antidepressants, the reported decreases in [3H]imipramine binding in depression may partly reflect residual treatment effects. It cannot be excluded that, in depression, the platelet [3H]imipramine receptor already is down-regulated maximally which would preclude a further down-regulation due to antidepressant drug therapy.
D000328:Adult; D001792:Blood Platelets / Q000378:metabolism*; D002352:Carrier Proteins; D002997:Clomipramine / Q000494:pharmacology*; D005260:Female; D006801:Humans; D007099:Imipramine / Q000097:blood*; D066298:In Vitro Techniques; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D011955:Receptors, Drug; D017981:Receptors, Neurotransmitter / Q000032:analysis; D012701:Serotonin / Q000097:blood*; D014316:Tritium
D002352:Carrier Proteins; D011955:Receptors, Drug; D017981:Receptors, Neurotransmitter; C027775:imipramine receptor; D014316:Tritium; D012701:Serotonin; D002997:Clomipramine; D007099:Imipramine