Increased hippocampal glutamate and volumetric deficits in unmedicated patients with schizophrenia.

Abstract:

IMPORTANCE:Alterations in glutamatergic neurotransmission have been postulated to be a key pathophysiologic mechanism in schizophrenia. OBJECTIVE:To evaluate hippocampal volumetric measures and neurometabolites in unmedicated patients with schizophrenia and the correlations between these markers. Our a priori hypothesis was that glutamate levels would negatively correlate with hippocampal volume in schizophrenia. DESIGN, SETTING, AND PARTICIPANTS:Combined 3-T structural magnetic resonance imaging and single-voxel proton magnetic resonance spectroscopy study at the Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, of 27 unmedicated patients with schizophrenia and 27 healthy controls. MAIN OUTCOMES AND MEASURES:Hippocampal volumetric measures and neurometabolites, and the correlations between volumetric measurements and neurometabolites. RESULTS:Hippocampal volumetric deficits, increased ratios of hippocampal glutamate and glutamine to creatine (Glx/Cr), and a loss of correlation between hippocampal N-acetylaspartate (NAA)/Cr and Glx/Cr in patients with schizophrenia were found. Significant correlations between hippocampal volumetric measures and Glx/Cr were also found in patients with schizophrenia but not healthy controls. CONCLUSIONS AND RELEVANCE:Our findings support the theory that alterations in hippocampal glutamate levels potentially account for structural deficits in the hippocampus observed in schizophrenia neuroimaging studies.

journal_name

JAMA Psychiatry

journal_title

JAMA psychiatry

authors

Kraguljac NV,White DM,Reid MA,Lahti AC

doi

10.1001/jamapsychiatry.2013.2437

subject

Has Abstract

pub_date

2013-12-01 00:00:00

pages

1294-302

issue

12

eissn

2168-622X

issn

2168-6238

pii

1748839

journal_volume

70

pub_type

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