title: Serotonin uptake and efflux in blood platelets from untreated and neuroleptic-treated schizophrenics.
abstract: Earlier studies on platelet serotonin uptake in schizophrenia have given equivocal results. In this study, platelet serotonin uptake in diluted plasma was assessed in 23 drug-free and 19 neuroleptic-treated schizophrenics, compared to 70 controls. The maximal uptake rate, Vmax, was slightly but significantly lower in drug-free schizophrenics than in the controls. In neuroleptic-treated patients there was a nonsignificant trend in the same direction. The "affinity constant" Km was significantly elevated in neuroleptic-treated schizophrenics compared to both controls and drug-free patients. Assessment of serotonin uptake in platelets resuspended in an artificial medium gave no definite answer whether reduced Vmax in plasma is due to a plasmatic or a platelet abnormality. Spontaneous efflux of serotonin from preloaded platelets did not differ significantly between patients and controls.
mesh_terms: D000293:Adolescent; D000328:Adult; D014150:Antipsychotic Agents / Q000627:therapeutic use*; D001792:Blood Platelets / Q000378:metabolism*; D005260:Female; D006207:Half-Life; D006801:Humans; D008297:Male; D008875:Middle Aged; D012559:Schizophrenia / Q000097:blood / Q000188:drug therapy*; D012701:Serotonin / Q000097:blood*
chemical_list: D014150:Antipsychotic Agents; D012701:Serotonin