ABSTRACT
OBJECTIVE: Attention deficit/hyperactivity disorder (ADHD) is a common neurodevelopmental disorder. Thus, the present study aimed to determine the effects of a single dose of methylphenidate (Mph) on neurometabolite levels according to polymorphisms of the catechol-O-methyltransferase (COMT) gene. METHODS: This study evaluated the neurometabolite levels including N-acetylaspartate (NAA), creatine (Cr), and choline (Cho) of ADHD patients, before and after treatment with Mph (10 mg) according to the presence of COMT polymorphisms. The spectra were obtained from the dorsolateral prefrontal cortex (DLPFC), anterior cingulate cortex (ACC), cerebellum, and striatum. RESULTS: The NAA levels of the val/val and val genotype carriers (val/val and val/met genotypes) increased in the DLPFC and ACC, respectively, following Mph treatment. The NAA/Cr ratio was lower in the DLPFC of val carriers than in the met/met genotype carriers prior to Mph administration. The Cho levels of the val/met genotype and val carriers increased in the striatum following Mph treatment. Following Mph treatment, the Cr levels of the met/met genotype carriers were higher than those of the val/met genotype and val carriers. Additionally, after Mph treatment, there was a significant increase in Cr levels in the DLPFC of the met/met genotype carriers but a significant decrease in such levels in the striatum of val/val genotype carriers. CONCLUSION: These findings suggest that polymorphisms of the COMT gene can account for individual differences in neuro-chemical responses to Mph among ADHD patients. Therefore, further studies are needed to fully characterize the effects of the Val158met polymorphism of the COMT gene on treatment outcomes in patients with ADHD.
Subject(s)
Humans , Attention Deficit Disorder with Hyperactivity , Catechol O-Methyltransferase , Cerebellum , Choline , Creatine , Genotype , Gyrus Cinguli , Individuality , Magnetic Resonance Spectroscopy , Methylphenidate , Prefrontal CortexABSTRACT
OBJECTIVE: To investigate the usefulness of 1H-magnetic resonance spectroscopy (1H-MRS) for the early diagnosis of neuropsychiatric systemic lupus erythematosus (NPSLE). METHODS: Magnetic resonance image (MRI) and 1H-MRS were performed on fifteen normal volunteers (mean age, 29+/-6 years; age range, 24~40 years) and twenty seven patients with SLE: twelve (26+/-8 years; 16~42 years) with and fifteen (32+/-12 years; 13~57 years) without NPSLE. The localized 1H-MRS was performed by a GE 1.5T SIGNA MRI/MRS system (version 5.5) with active shielded gradients. For all spectra, a Stimulated Echo Acquisition Method (STEAM) localization sequence with three-pulse CHESS H2O suppression was used. The metabolite ratios of N-acetylaspartate (NAA) to creatine (Cr) and choline (Cho) to Cr measured on 1H-MRS of the basal ganglia (BG) and peritrigonal periventricular white matter (PWM). RESULTS: The level of disease activity makers (anti-dsDNA, C3, C4, SLEDAI score), autoantibodies (lupus anticoagulant, anticardiolipin antibody, antiribosomal-P), and EEG did not showed significant difference between the patients without NPSLE and with NPSLE (p>0.05). Thirteen percent (2/15) of patients without NPSLE and fifty percent (6/12) of patient with the NPSLE showed abnormality in MRI. 1H-MRS showed significantly decreased NAA/Cr ratio in BG and increased Cho/Cr ratio in PWM for the patients with NPSLE compared to the patients without NPSLE and normal volunteers (p0.05). But negative correlation was shown between NAA/Cr in BG and Cho/Cr ratio in PWM (r=-0.58, p<0.05). CONCLUSION: NAA/Cr ratio in BG was decreased and Cho/Cr in PWM was increased in NPSLE. The neurometabolite ratio measured by 1H-MRS may be useful in the early detection of NPSLE.
Subject(s)
Humans , Antibodies, Anticardiolipin , Autoantibodies , Basal Ganglia , Choline , Creatine , Early Diagnosis , Electroencephalography , Healthy Volunteers , Lupus Vasculitis, Central Nervous System , Magnetic Resonance Imaging , Spectrum AnalysisABSTRACT
OBJECTIVE: To investigate the usefulness of 1H-magnetic resonance spectroscopy (1H-MRS) for the early diagnosis of neuropsychiatric systemic lupus erythematosus (NPSLE). METHODS: Magnetic resonance image (MRI) and 1H-MRS were performed on fifteen normal volunteers (mean age, 29+/-6 years; age range, 24~40 years) and twenty seven patients with SLE: twelve (26+/-8 years; 16~42 years) with and fifteen (32+/-12 years; 13~57 years) without NPSLE. The localized 1H-MRS was performed by a GE 1.5T SIGNA MRI/MRS system (version 5.5) with active shielded gradients. For all spectra, a Stimulated Echo Acquisition Method (STEAM) localization sequence with three-pulse CHESS H2O suppression was used. The metabolite ratios of N-acetylaspartate (NAA) to creatine (Cr) and choline (Cho) to Cr measured on 1H-MRS of the basal ganglia (BG) and peritrigonal periventricular white matter (PWM). RESULTS: The level of disease activity makers (anti-dsDNA, C3, C4, SLEDAI score), autoantibodies (lupus anticoagulant, anticardiolipin antibody, antiribosomal-P), and EEG did not showed significant difference between the patients without NPSLE and with NPSLE (p>0.05). Thirteen percent (2/15) of patients without NPSLE and fifty percent (6/12) of patient with the NPSLE showed abnormality in MRI. 1H-MRS showed significantly decreased NAA/Cr ratio in BG and increased Cho/Cr ratio in PWM for the patients with NPSLE compared to the patients without NPSLE and normal volunteers (p0.05). But negative correlation was shown between NAA/Cr in BG and Cho/Cr ratio in PWM (r=-0.58, p<0.05). CONCLUSION: NAA/Cr ratio in BG was decreased and Cho/Cr in PWM was increased in NPSLE. The neurometabolite ratio measured by 1H-MRS may be useful in the early detection of NPSLE.