TY  - JOUR
T1  - ELevated striatal dopamine function linked to prodromal signs of schizophrenia
AU  - Howes OD, Montgomery AJ, Asselin M, et al
Y1  - 2009/01/01
N1  - 10.1001/archgenpsychiatry.2008.514
JO  - Archives of General Psychiatry
SP  - 13
EP  - 20
VL  - 66
IS  - 1
N2  - Context 
    A major limitation on the development of biomarkers and novel interventions for schizophrenia is that its pathogenesis is unknown. Although elevated striatal dopamine activity is thought to be fundamental to schizophrenia, it is unclear when this neurochemical abnormality develops in relation to the onset of illness and how this relates to the symptoms and neurocognitive impairment seen in individuals with prodromal symptoms of schizophrenia.Objectives 
    To determine whether striatal dopamine function is elevated in individuals with prodromal symptoms of schizophrenia before the onset of psychosis and to assess how this relates to the symptoms and neurocognitive impairment.Design 
    Case-control study of in vivo striatal dopaminergic function.Setting 
    Academic research.Patients 
    Patients were recruited from a community mental health service. Twenty-four patients having prodromal symptoms of schizophrenia were compared with 7 patients having schizophrenia and with 12 matched healthy control subjects from the same community.Main Outcome Measure 
    Striatal 6-fluoro–L-dopa F 18–dopa uptake measured using positron emission tomographic 18F-dopa imaging.Results 
    Striatal 18F-dopa uptake was elevated in patients with prodromal symptoms of schizophrenia (effect size, 0.75) to an intermediate degree compared with that in patients with schizophrenia (effect size, 1.25). The elevation was localized in the associative striatum in both groups. Moreover, striatal 18F-dopa uptake in patients with prodromal symptoms of schizophrenia was correlated with the severity of prodromal psychopathologic and neuropsychological impairment but not with the severity of anxiety or depressive symptoms.Conclusions 
    These findings indicate that dopamine overactivity predates the onset of schizophrenia in individuals with prodromal psychotic symptoms, is predominantly localized in the associative striatum, and is correlated with the severity of symptoms and neurocognitive dysfunction.
SN  - 0003-990X
M3  - doi: 10.1001/archgenpsychiatry.2008.514
UR  - http://dx.doi.org/10.1001/archgenpsychiatry.2008.514
ER  -