Platelet serotonin-2A receptors: a potential biological marker for suicidal behavior

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Abstract
OBJECTIVE: Abnormalities in the serotonergic system have been implicated in suicidal behavior. Higher numbers of serotonin-2 (5-HT2) receptors have been reported in the post-mortem brain of suicide victims. In order to further examine the role of 5-HT2A receptors in suicidal behavior, the authors studied 5-HT2A receptors in platelets of suicidal and nonsuicidal patients as well as normal comparison subjects. METHOD: 5-HT2A receptor levels were determined by using [125I]LSD as a radioligand in platelets obtained from hospitalized psychiatric patients (N = 131) and nonhospitalized normal comparison subjects (N = 40) during a drug-free baseline period. Patients were diagnosed according to DSM-III-R criteria, and suicidal behavior was identified by using the Hamilton Depression Rating Scale. RESULTS: The mean maximum number of binding sites (Bmax) of platelet 5-HT2A receptors for all suicidal patients was significantly higher than for nonsuicidal patients or normal comparison subjects. This significant differ...