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Magn Reson Med. 1995 Jun;33(6):858-61.

Role of increased cerebral myo-inositol in the dementia of Down syndrome.

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Magnetic Resonance Spectroscopy Unit, Huntington Medical Research Institutes, Pasadena, CA 91105, USA.


The purpose of this study was to determine cerebral myo-inositol (mI) in adults with Down syndrome (DS), and to trace the chronobiology of DS to Alzheimer disease (AD). AD has characteristic neuropathology of neurofibrillary plaques and tangles; indirect evidence links this to earlier deposition of beta-amyloid. Elevated mI, which distinguishes AD from other common dementias, is also elevated in 23 young patients who have DS without dementia. In one patient who has DS with dementia, mI is elevated and N-acetylaspartate (NAA) decreased. The similarity to AD is striking and may suggest a progressive neurochemical disorder in which elevation of mI precede loss of NAA in both AD and DS.

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