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Neurochemical adaptation to cocaine abuse: reduction of N-acetyl aspartate in thalamus of human cocaine abusers

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Neurochemical adaptation to cocaine abuse: reduction of N-acetyl aspartate in thalamus of human cocaine abusers

Auteurs : Shi-Jiang Li [États-Unis] ; Yonker Wang [États-Unis] ; John Pankiewicz [États-Unis] ; Elliot A. Stein [États-Unis]

Source :

RBID : ISTEX:D70EFA9BCF79CC65D1C5ABCF3836DB2EAA93B029

English descriptors

Abstract

Abstract: Background: The aim of this study was to determine the existence of, and possible mechanisms for, chronic cocaine use-induced neurotoxicity in the human brain. Because in vivo magnetic resonance spectroscopy (MRS) provides a noninvasive way to detect biochemical and physiological changes in the brain, we sought to specifically determine the neurochemical adaptations in chronic cocaine-dependent subjects.Methods: Twenty-one cocaine users and 13 non–drug-using, age-matched normal volunteers were recruited for an in vivo proton MRS study. Following screening that included physical examination, histories, and blood testing, cocaine group subjects received a spectral scan on a 1.5-T GE Signa scanner. Spectra were obtained from the left basal ganglia and/or the left thalamus from subjects in both groups using an rf bird-cage type head coil with single-voxel localization.Results: The level of N-acetyl aspartate in the region of left thalamus was lower (17%) in the chronic cocaine user group but not in the region of left basal ganglia, compared with the control group.Conclusions: These results suggest that chronic cocaine use may induce abnormal neurochemical activity and a state of neuronal dysregulation and/or neurotoxicity. It will now be important to determine if these alterations are reversible during withdrawal and what the functional implications of this observation are with respect to cognitive function and drug relapse.

Url:
DOI: 10.1016/S0006-3223(98)00230-3

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ISTEX:D70EFA9BCF79CC65D1C5ABCF3836DB2EAA93B029

Le document en format XML

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<term>In vivo proton magnetic resonance spectroscopy</term>
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<term>creatine</term>
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<term>Acute cocaine administration</term>
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<term>Basal</term>
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<term>Biophysics research institute</term>
<term>Cerebral atrophy</term>
<term>Cerebral metabolites</term>
<term>Cerebral vasculitis</term>
<term>Chronic cocaine</term>
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<term>Normal volunteer</term>
<term>Polydrug abusers</term>
<term>Polysubstance abusers</term>
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<term>Present study</term>
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<term>Spgr images</term>
<term>Spgr surface coil image</term>
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<div type="abstract" xml:lang="en">Abstract: Background: The aim of this study was to determine the existence of, and possible mechanisms for, chronic cocaine use-induced neurotoxicity in the human brain. Because in vivo magnetic resonance spectroscopy (MRS) provides a noninvasive way to detect biochemical and physiological changes in the brain, we sought to specifically determine the neurochemical adaptations in chronic cocaine-dependent subjects.Methods: Twenty-one cocaine users and 13 non–drug-using, age-matched normal volunteers were recruited for an in vivo proton MRS study. Following screening that included physical examination, histories, and blood testing, cocaine group subjects received a spectral scan on a 1.5-T GE Signa scanner. Spectra were obtained from the left basal ganglia and/or the left thalamus from subjects in both groups using an rf bird-cage type head coil with single-voxel localization.Results: The level of N-acetyl aspartate in the region of left thalamus was lower (17%) in the chronic cocaine user group but not in the region of left basal ganglia, compared with the control group.Conclusions: These results suggest that chronic cocaine use may induce abnormal neurochemical activity and a state of neuronal dysregulation and/or neurotoxicity. It will now be important to determine if these alterations are reversible during withdrawal and what the functional implications of this observation are with respect to cognitive function and drug relapse.</div>
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