Longitudinal Functional Magnetic Resonance Spectroscopy Study in Subjects with Mild Cognitive Impairment and Alzheimer’s Disease

Author(s): Soo-Hyun Cho, Hak Y. Rhee, Janghoon Oh, Jin S. Lee, Soonchan Park, Won C. Shin, Jong-Woo Paik, Chang-Woo Ryu, Key C. Park, Geon-Ho Jahng*

Journal Name: Current Alzheimer Research

Volume 18 , Issue 4 , 2021


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Abstract:

Background: Longitudinal changes of brain metabolites during a functional stimulation are unknown in amnestic mild cognitive impairment (aMCI) and Alzheimer’s disease (AD) subjects.

Objective: This study was to evaluate the longitudinal changes of brain metabolites using proton magnetic resonance spectroscopy (1H MRS) in response to treatment during a memory task in the subjects of cognitive normal (CN), aMCI, and AD.

Methods: We acquired functional magnetic resonance spectroscopy (fMRS) data from 28 CN elderly, 16 aMCI and 12 AD subjects during a face-name association task. We measured fMRS metabolite ratios over 24 months in the 8-month apart, determined the temporal changes of the metabolites, and evaluated the differences among the three groups under the three different conditions (base, novel, repeat).

Results: The results of comparisons for the three subject groups and the three-time points showed that tNAA/tCho and tCr/tCho were statistically significant among the three subject groups in any of the three conditions. The dynamic temporal change measurements for the metabolites for each condition showed that Glx/tCho and Glu/tCho levels at the third visit increased significantly compared with in the first visit in the novel condition in the AD group.

Conclusion: We found declines in tNAA/tCho and tCr/tCho in the aMCI and AD subjects with increasing disease severity, being highest in CN and lowest in AD. The Glx/tCho level increased temporally in the AD subjects after they took an acetylcholine esterase inhibitor. Therefore, Glx may be suitable to demonstrate functional recovery after treatment.

Keywords: Longitudinal study, functional magnetic resonance spectroscopy, Alzheimer's disease, mild cognitive impairment, glutamine and glutamate complex (Glx), total N-acetylaspartate (tNAA).

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Article Details

VOLUME: 18
ISSUE: 4
Year: 2021
Published on: 08 September, 2021
Page: [335 - 346]
Pages: 12
DOI: 10.2174/1567205018666210708145924
Price: $65

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