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Platelet markers of suicidality.
Annals of the New York Academy of Sciences
|January 1, 1986
Summary
Depressed patients with higher suicide ratings showed altered serotonin (5-HT) platelet measures, suggesting reduced presynaptic serotonergic activity. Low monoamine oxidase (MAO) activity was linked to suicide attempts in some patients.
Area of Science:
- Neuroscience
- Psychiatry
- Biochemistry
Background:
- Serotonergic system dysfunction is implicated in major depressive disorder.
- Platelet measures are often used as peripheral markers for central serotonergic activity.
Purpose of the Study:
- To investigate the relationship between specific blood platelet serotonergic measures and suicide ratings in psychiatric patients.
- To explore potential peripheral biomarkers for suicide risk in depression.
Main Methods:
- Measured six serotonergic parameters in blood platelets: serotonin (5-HT) uptake kinetics (Km, Vmax), 3H-imipramine binding (Kd, Bmax), 5-HT content, and monoamine oxidase (MAO) activity.
- Correlated these measures with Hamilton Depression Scale suicide ratings.
- Utilized multivariate analyses to identify significant predictors of suicide ratings.
Main Results:
- Platelet Km for 5-HT uptake was negatively correlated with suicide ratings.
- Platelet Kd for 3H-imipramine binding was positively correlated with suicide ratings.
- Km, Kd, Vmax, and MAO activity were significant predictors of suicide ratings; low MAO activity was observed in non-depressed females with suicide attempts.
Conclusions:
- Findings suggest diminished presynaptic serotonergic activity in psychiatric patients with higher suicide ratings.
- Platelet serotonergic measures may serve as potential indicators of suicide risk.
- Further research is needed to confirm the extrapolation of platelet findings to central 5-HT nerve terminals.