The Beck Depression Inventory is frequently used to detect depression and its severity because depression is a prevalent mood disorder and is commonly treated by prescription of selective serotonin-reuptake inhibitors such as Prozac. The importance of serotonin (5-HT) in the treatment of major depression is evident but the nature of this involvement is unclear. In this study, the characteristics of platelets are employed as a peripheral model of the neuron to estimate central serotonergic activity, which is a consequence of numerous factors including 5-HT2 receptor sensitivity. The greater the sensitivity of the platelet serotonin receptors, the lower the concentration of serotonin required to mobilise a particular amount of calcium from internal stores through serotonin stimulation. Hence, Platelet 5-HT2 receptor sensitivity is inferred from the concentration of serotonin that is required to produce half maximal intracellular calcium mobilisation (EC50). In the present study, the correlation of –.422 between scores on the Beck Depression Inventory and EC50 in a sample of 49 university students was significant, implying that mood is significantly related to 5-HT2 receptor sensitivity, such that increases in depressed mood are accompanied by increases in 5-HT2 receptor sensitivity.
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