期刊
SCHIZOPHRENIA BULLETIN
卷 47, 期 2, 页码 505-516出版社
OXFORD UNIV PRESS
DOI: 10.1093/schbul/sbaa128
关键词
1H-MRS/PET/antipsychotic response; treatment resistance/schizophrenia
类别
资金
- Medical Research Council (MRC) UK, Stratified Medicines Initiative [MR/L011794/1]
- Department of Health via the National Institute for Health Research (NIHR) Specialist Biomedical Research Center for Mental Health
- Maudsley NHS Foundation Trust (SLaM)
- Institute of Psychiatry, Psychology and Neuroscience at King's College London
- MRC [MR/L011794/1, G0701127] Funding Source: UKRI
Variability in the response to antipsychotic medication in schizophrenia may be related to differences in neurobiology between patients. Studies suggest that elevated ACC glutamate levels may be associated with a poorer therapeutic response. Further research is needed to explore the potential impact of ACC glutamate levels on treatment outcomes.
The variability in the response to antipsychotic medication in schizophrenia may reflect between-patient differences in neurobiology. Recent cross-sectional neuroimaging studies suggest that a poorer therapeutic response is associated with relatively normal striatal dopamine synthesis capacity but elevated anterior cingulate cortex (ACC) glutamate levels. We sought to test whether these measures can differentiate patients with psychosis who are antipsychotic responsive from those who are antipsychotic nonresponsive in a multicenter cross-sectional study. H-1-magnetic resonance spectroscopy (H-1-MRS) was used to measure glutamate levels (Glu(corr)) in the ACC and in the right striatum in 92 patients across 4 sites (48 responders [R] and 44 nonresponders [NR]). In 54 patients at 2 sites (25 R and 29 NR), we additionally acquired 3,4-dihydroxy-6-[18F]fluoro-l-phenylalanine (18F-DOPA) positron emission tomography (PET) to index striatal dopamine function (K-i(cer), min(-1)). The mean ACC Glu(corr) was higher in the NR than the R group after adjustment for age and sex (F-1(,80) = 4.27; P = .04). This was associated with an area under the curve for the group discrimination of 0.59. There were no group differences in striatal dopamine function or striatal Glu(corr). The results provide partial further support for a role of ACC glutamate, but not striatal dopamine synthesis, in determining the nature of the response to antipsychotic medication. The low discriminative accuracy might be improved in groups with greater clinical separation or increased in future studies that focus on the antipsychotic response at an earlier stage of the disorder and integrate other candidate predictive biomarkers. Greater harmonization of multicenter PET and H-1-MRS may also improve sensitivity.
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