Document Detail

Increased N-Acetylaspartate/creatine ratio in the medial prefrontal cortex among unmedicated obsessive-compulsive disorder patients.
MedLine Citation:
PMID:  20923427     Owner:  NLM     Status:  MEDLINE    
AIMS: Changes in the fronto-striato-thalamo-cortical-circuit loop have been suggested in the pathogenesis of obsessive-compulsive disorder (OCD), and have been studied using (1)H magnetic resonance spectroscopy ((1)H MRS) with interesting findings. However, whether neural metabolites are abnormal in the medial prefrontal cortex in patients with OCD is unknown. The purpose of the present study was to investigate neural metabolites in this brain region in a sample of patients with OCD.
METHODS: Subjects were 21 unmedicated OCD patients, including 10 who were drug-naïve, and 19 healthy controls. Single-voxel (1)H MRS was used to study the medial prefrontal cortex for each subject. Levels of N-acetylaspartate (NAA), choline-containing compounds and myoinositol were measured in terms of their ratios with creatine (Cr).
RESULTS: The NAA/Cr ratio was significantly higher among OCD patients than among healthy controls (F = 4.76, P = 0.037). However, it did not correlate with patients' symptoms or with their illness durations. The NAA/Cr ratio also did not differ between drug-naïve and previously medicated patients. No significant group differences were found between OCD patients and normal controls for the choline-containing compounds/Cr or myoinositol/Cr ratios. In addition, a significant correlation between the NAA/Cr ratio and trait anxiety scores on the State-Trait Anxiety Inventory was found among the controls (r = 0.639, P = 0.010).
CONCLUSIONS: The N-Acetylaspartate level relative to creatine in the medial prefrontal cortex was increased among unmedicated OCD patients. This cannot be attributed to the effect of medications. The possible significance of this finding in the pathophysiology of OCD is discussed.
Qing Fan; Ling Tan; Chao You; Jijun Wang; Colin A Ross; Xuemei Wang; Tianhong Zhang; Jianqi Li; Kemin Chen; Zeping Xiao
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Psychiatry and clinical neurosciences     Volume:  64     ISSN:  1440-1819     ISO Abbreviation:  Psychiatry Clin. Neurosci.     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-06     Completed Date:  2011-01-21     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9513551     Medline TA:  Psychiatry Clin Neurosci     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  483-90     Citation Subset:  IM    
Copyright Information:
© 2010 Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine. Psychiatry and Clinical Neurosciences © 2010 Japanese Society of Psychiatry and Neurology.
Shanghai Mental Health Center, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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MeSH Terms
Aspartic Acid / analogs & derivatives*,  metabolism
Choline / metabolism
Creatine / metabolism*
Diagnostic and Statistical Manual of Mental Disorders
Inositol / metabolism
Interview, Psychological
Magnetic Resonance Imaging
Middle Aged
Neuropsychological Tests
Obsessive-Compulsive Disorder / metabolism*,  psychology
Prefrontal Cortex / metabolism*
Young Adult
Reg. No./Substance:
56-84-8/Aspartic Acid; 57-00-1/Creatine; 62-49-7/Choline; 6917-35-7/Inositol; 997-55-7/N-acetylaspartate

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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