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Updated: Jul 1, 2026
Identification of Disease-related Spatial Covariance Patterns using Neuroimaging Data
Published on: June 26, 2013
Dual association patterns between microglial activation and neuronal health in Alzheimer's disease: a whole-brain
Yaoyu Zhang1,2,3, Xiao-Hang Qian4,5, Huixiang Zhuang1
1Department of Nuclear Medicine, Ruijin Hospital, School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Introduction:
Microglial activation can either support neuronal function or exacerbate damage, contributing to Alzheimer's disease (AD) progression. We investigated spatial relationships among microglial activation, neuronal health, and amyloid beta (Aβ) in the AD spectrum.
Methods:
Forty healthy controls, 37 patients with mild cognitive impairment (MCI), and 62 patients with AD underwent whole-brain high-resolution 1H-magnetic resonance spectroscopic imaging (MRSI), [1 8F]DPA-714, and [1 8F]AV-45 positron emission tomography (PET). Regional and voxel-wise analyses assessed changes and associations of microglial activation with N-acetylaspartate (NAA) and Aβ.
Results:
MCI and AD patients showed higher microglial activation and lower NAA, correlating with cognitive decline. In controls and MCI, microglial activation correlated positively with NAA and Aβ in early amyloid-accumulating regions. Conversely, negative correlations with NAA emerged in the hippocampus in MCI and extended to temporal and occipital regions in AD.
Discussion:
For the first time, we identified two distinct spatial association patterns between [1 8F]DPA-714 PET and NAA, shedding light on the complex interplay between neuroinflammation and neuronal health in AD.
Insights
Microglial activation in Alzheimer's disease (AD) spectrum shows distinct spatial patterns with neuronal health. Early stages link inflammation to neuronal markers and amyloid beta, while later stages show inflammation negatively impacting neuronal health.
Area of Science:
- Neuroscience
- Neurology
- Radiology
Background:
- Microglial activation plays a dual role in neuronal function and damage, impacting Alzheimer's disease (AD) progression.
- Understanding the spatial interplay between neuroinflammation, neuronal health, and amyloid beta (Aβ) is crucial for AD research.
Purpose of the Study:
- To investigate the spatial relationships among microglial activation, neuronal health (measured by N-acetylaspartate, NAA), and Aβ deposition across the AD spectrum.
- To identify distinct patterns of neuroinflammation and neuronal integrity in healthy controls, mild cognitive impairment (MCI), and AD patients.
Main Methods:
- Utilized whole-brain high-resolution 1H-magnetic resonance spectroscopic imaging (MRSI) and positron emission tomography (PET) with tracers [18F]DPA-714 (for microglial activation) and [18F]AV-45 (for Aβ).
- Analyzed regional and voxel-wise data from 40 healthy controls, 37 MCI patients, and 62 AD patients.
- Assessed associations between microglial activation, NAA levels, and Aβ burden.
Main Results:
- MCI and AD patients exhibited increased microglial activation and reduced NAA, correlating with cognitive decline.
- In controls and MCI, microglial activation positively correlated with NAA and Aβ in early amyloid-accumulating areas.
- Negative correlations between microglial activation and NAA were observed in the hippocampus in MCI, extending to temporal and occipital regions in AD.
Conclusions:
- This study reveals two distinct spatial association patterns between microglial activation ([18F]DPA-714 PET) and neuronal health (NAA) in the AD spectrum.
- These findings elucidate the complex interplay between neuroinflammation and neuronal integrity in the progression of Alzheimer's disease.
