Reduced brain glutamate in patients with Parkinson's disease
Identifieur interne : 000C81 ( Main/Exploration ); précédent : 000C80; suivant : 000C82Reduced brain glutamate in patients with Parkinson's disease
Auteurs : H. Randall Griffith [États-Unis] ; Ozioma C. Okonkwo [États-Unis] ; Timothy O'Brien [États-Unis] ; Jan A. Den Hollander [États-Unis]Source :
- NMR in Biomedicine [ 0952-3480 ] ; 2008-05.
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Abstract
An understanding of the role played by glutamate (Glu) in idiopathic Parkinson's disease (PD) has remained somewhat elusive. Animal models of PD suggest that over‐activity of Glu receptors complicates the motor symptoms of PD and that Glu blockade may be a pharmacologic target in PD, whereas patient autopsy studies have proved less convincing for changes in Glu. No previous 1H MRS patient studies have documented changes in glutamate. All but one of these previous studies were performed at 1.5 T. We performed 3 T 1H MRS of the posterior cingulate gyrus in 12 non‐demented patients with PD and 12 age‐matched, neurologically normal control participants. Glu, N‐acetylaspartate (NAA) and choline‐containing compounds (Cho) measured in reference to creatine + phosphocreatine (Cr) were determined from single‐voxel proton MR spectra measured by PRESS at TE of 80 ms. The results show that the Glu/Cr ratio was reduced in patients with PD compared with controls (t = 2.54; P = 0.019), whereas no differences were observed in NAA/Cr or Cho/Cr ratios. These findings suggest that a reduction in Glu occurs in the cerebral cortex of patients with PD. 1H MRS at 3 T should be investigated in future studies as a means of tracking the course of metabolic brain changes in association with progression of disease in patients with PD. Copyright © 2007 John Wiley & Sons, Ltd.
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DOI: 10.1002/nbm.1203
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Animal models of PD suggest that over‐activity of Glu receptors complicates the motor symptoms of PD and that Glu blockade may be a pharmacologic target in PD, whereas patient autopsy studies have proved less convincing for changes in Glu. No previous 1H MRS patient studies have documented changes in glutamate. All but one of these previous studies were performed at 1.5 T. We performed 3 T 1H MRS of the posterior cingulate gyrus in 12 non‐demented patients with PD and 12 age‐matched, neurologically normal control participants. Glu, N‐acetylaspartate (NAA) and choline‐containing compounds (Cho) measured in reference to creatine + phosphocreatine (Cr) were determined from single‐voxel proton MR spectra measured by PRESS at TE of 80 ms. The results show that the Glu/Cr ratio was reduced in patients with PD compared with controls (t = 2.54; P = 0.019), whereas no differences were observed in NAA/Cr or Cho/Cr ratios. These findings suggest that a reduction in Glu occurs in the cerebral cortex of patients with PD. 1H MRS at 3 T should be investigated in future studies as a means of tracking the course of metabolic brain changes in association with progression of disease in patients with PD. Copyright © 2007 John Wiley & Sons, Ltd.</div></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Alabama</li></region></list><tree><country name="États-Unis"><region name="Alabama"><name sortKey="Griffith, H Randall" sort="Griffith, H Randall" uniqKey="Griffith H" first="H. Randall" last="Griffith">H. Randall Griffith</name></region><name sortKey="Griffith, H Randall" sort="Griffith, H Randall" uniqKey="Griffith H" first="H. Randall" last="Griffith">H. Randall Griffith</name><name sortKey="Griffith, H Randall" sort="Griffith, H Randall" uniqKey="Griffith H" first="H. Randall" last="Griffith">H. Randall Griffith</name><name sortKey="Hollander, Jan A Den" sort="Hollander, Jan A Den" uniqKey="Hollander J" first="Jan A. Den" last="Hollander">Jan A. Den Hollander</name><name sortKey="O Brien, Timothy" sort="O Brien, Timothy" uniqKey="O Brien T" first="Timothy" last="O'Brien">Timothy O'Brien</name><name sortKey="Okonkwo, Ozioma C" sort="Okonkwo, Ozioma C" uniqKey="Okonkwo O" first="Ozioma C." last="Okonkwo">Ozioma C. Okonkwo</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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