Striatal Creatine and Glutamate/Glutamine in Attention-Deficit/Hyperactivity Disorder

• Published in: Journal of child and adolescent psychopharmacology Vol. 17; no. 1; pp. 11 - 17
• Main Authors: Carrey, Normand J., MacMaster, Frank P., Gaudet, Laura, Schmidt, Matthias H.
• Format: Journal Article
• Language: English
• Published: United States Mary Ann Liebert, Inc 01.02.2007
• Subjects: Attention Deficit Disorder with Hyperactivity - drug therapy; Attention Deficit Disorder with Hyperactivity - physiopathology; Attention deficit hyperactivity disorder; Boys; Brain; Central Nervous System Stimulants - therapeutic use; Child; Child psychology; Choline - metabolism; Comparative studies; Corpus Striatum - drug effects; Corpus Striatum - physiopathology; Creatine - metabolism; Dose-Response Relationship, Drug; Glutamic Acid - metabolism; Glutamine - metabolism; Humans; Inositol - metabolism; Magnetic Resonance Imaging; Magnetic Resonance Spectroscopy; Male; Methylphenidate - therapeutic use; Neural Pathways - drug effects; Neural Pathways - physiopathology; Neurology; Occipital Lobe - drug effects; Occipital Lobe - physiopathology; Pharmacology; Phosphocreatine - metabolism; Prefrontal Cortex - drug effects; Prefrontal Cortex - physiopathology; Reference Values; Spectrum analysis
• ISSN: 1044-5463; 1557-8992
• DOI: 10.1089/cap.2006.0008

The glutamatergic prefrontal-striatal pathway has been implicated previously in the neurobiology of attention-deficit/hyperactivity disorder (ADHD). We used short echo proton magnetic resonance spectroscopy (1H-MRS) to examine glutamate in the prefrontal cortex, left striatum, and, as a control area, the occipital lobe. Thirteen treatment-naïve ADHD children and 10 healthy comparison subjects participated. All were males between the ages of 6 to 11 years of age. Twelve ADHD subjects were scanned after 8 weeks of treatment. Striatal glutamate, glutamate/glutamine (Glx) and creatine concentrations were greater in the ADHD subjects at baseline as compared to controls. Only striatal creatine, not glutamate or Glx, was reduced after stimulant treatment in the ADHD patients. No significant differences between groups were noted in the remainder of the striatal metabolites or any of the occipital lobe or prefrontal cortex metabolites. These findings provide initial evidence of a striatal creatine/glutamatergic dysregulation in ADHD.