(1)H-MR spectroscopy differentiates mild cognitive impairment from normal brain aging

Area of Science:

• Neuroimaging and Neurochemistry
• Biomarkers for Neurodegenerative Diseases

Background:

• White matter integrity is crucial for cognitive function.
• Alzheimer's disease (AD) and mild cognitive impairment (MCI) involve white matter alterations.
• Understanding biochemical changes in white matter can aid in early diagnosis.

Purpose of the Study:

• To characterize the white matter biochemical profile in healthy elderly subjects, MCI patients, and early AD patients.
• To identify specific metabolic markers differentiating these groups using proton magnetic resonance spectroscopy ((1)H-MRS).
• To investigate the relationship between white matter biochemistry and cognitive status.

Main Methods:

• Proton magnetic resonance spectroscopy ((1)H-MRS) was employed.
• Measurements included myo-inositol, creatine, N-acetylaspartate (NAA), and choline.
• Analysis focused on the paratrigonal white matter bilaterally.

Main Results:

• A significantly higher myo-inositol/creatine ratio was observed in MCI and AD groups compared to controls.
• The NAA/creatine ratio was reduced in the left hemisphere of AD patients versus controls.
• No significant differences in the choline/creatine ratio were found among the groups.

Conclusions:

• MCI exhibits a distinct white matter biochemical profile compared to normal brain aging.
• The observed white matter metabolic pattern in MCI resembles that of early Alzheimer's disease.
• These findings suggest shared biochemical pathways in MCI and AD white matter.