@article{oai:repo.qst.go.jp:00044015,
 author = {Takanashi, Junichi and Ikehira, Hiroo and Tanada, Shuji and Yoshitome, Eiji and et.al and 高梨 潤一 and 池平 博夫 and 棚田 修二 and 吉留 英二},
 issue = {2},
 journal = {Neurology},
 month = {Jan},
 note = {Obfective:To assess alterations in brain metabolites of patients with Pelizaeus-Merzbacher disease (PMD) with the proteolipid protein gene 1 (PLP1) duplications using quantitative proton MRS. Methods:Five unrelated male Japanese patients with PMD with PLP1 duplications were analyzed using automated proton brain examination with the point resolved spectroscopy technique (repetition and echo time of 5,000 and 30 msec). Localized spectra in the posterior portion of the centrum semiovale were acquired, and absolute metabolite concentrations were calculated using the LCModel. Results:Absolute concentrations of N-acetylaspartate (NAA),creatine (Cr),and 
myoinositol(MI) were increased by 16%(p<0.01),and 43%(p<0.001),and 31%(p<0.01)in patients with PMD as compared with age-matched controls,There was no statistical difference in choline concentration. Conclusion:The increased concentration of NAA,which could not be detected by previous relative quantitation methods, suggests two possibilities: axonal involvement secondary to dysmyelination, or increased cell population of oligoddendrocyte progenitors. Elevated Cr and MI concentrations may reflect the reactive astrocytic gliosis. Our study thus emphasizes the importance of absolute quantitation of metabolites to investigate the disease mechanism of the dysmyelinating disorders of the CNS.},
 pages = {237--241},
 title = {Brain N-aetylaspartate is elevated in Pelizaeus-Merzbacher disease with PLP1 duplication},
 volume = {58},
 year = {2002}
}