期刊
SCHIZOPHRENIA RESEARCH
卷 140, 期 1-3, 页码 136-142出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.schres.2012.06.039
关键词
Schizophrenia; Hippocampus; fMRI; MRS; NAA; Glutamate
类别
资金
- National Institute of Health [R01 MH081014, R01 NS053998, U01 NS058634, MH081014]
- National Institute of Mental Health [R01 MH081014]
Background: Studies have shown that individuals with schizophrenia suffer from memory impairments. In this study, we combined proton magnetic resonance spectroscopy (H-1-MRS) and functional magnetic resonance imaging (fMRI) to clarify the neurobiology of memory deficits in schizophrenia. Methods: We used single-voxel MRS acquired in the left hippocampus and fMRI during performance of a memory task to obtain measures of neurochemistry and functional response in 28 stable, medicated participants with schizophrenia (SZ) and 28 matched healthy controls (HC). Results: The SZ group had significantly decreased blood oxygen level-dependent (BOLD) signal in left inferior frontal gyrus (IFG) during encoding and in the anterior cingulate cortex (ACC) and superior temporal gyrus (STG) during retrieval. We did not find significant differences in N-acetylaspartate/creatine (NAA/Cr) or glutamate+glutamine (Glx/Cr) levels between the groups, but did find a significant positive correlation between NAA/Cr and Glx/Cr in the HC group thatwas absent in the SZ group. Therewere no significant correlations between BOLD and MRS measured in the hippocampus. Further analyses revealed a negative correlation between left IFG BOLD and task performance in the SZ group. Finally, in the HC group, the left IFG BOLD was positively correlated with Glx/Cr. Conclusions: We replicated findings of reduced BOLD signal in left IFG and of an altered relationship between IFG BOLD response and task performance in the SZ. The absence of correlation between NAA/Cr and Glx/Cr levels in patients might suggest underlying pathologies of the glutamate-glutamine cycle and/or mitochondria. (C) 2012 Elsevier B. V. All rights reserved.
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