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Lack of seasonal variation in platelet tritiated imipramine binding in humans


, : Lack of seasonal variation in platelet tritiated imipramine binding in humans. Biological Psychiatry 21(10): 876-882

The Bmax of [3H]imipramine (IMI) binding has been reported to be reduced in platelets of depressed untreated patients as compared with normal controls. However, it has also been suggested that this difference could be related to the failure to take into account seasonal variations in the binding parameters for [3H]IMI recognition sites in platelets. For this reason, [3H]IMI binding was studied throughout 1 year in platelet membranes from 11 control volunteers, with blood samples collected once a month. The Bmax and Kd values of [3H]IMI binding showed no significant variation throughout the 12-month period of the study. These results indicate that in the control population, the platelet [3H]IMI binding parameters remain stable, and that the decrease in Bmax observed in depressed untreated patients reflects a genuine difference, which may be considered to be a biological marker in depression.

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