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Comprehensive Autopsy Program for Individuals with Multiple Sclerosis

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Myelination- and immune-mediated MR-based brain network correlates.

Manuela Cerina¹, Muthuraman Muthuraman², Marco Gallus¹

¹Department of Neurology with Institute of Translational Neurology, Münster University Hospital, Münster, Germany.

Journal of Neuroinflammation

|June 14, 2020

Summary

This study reveals how magnetic resonance imaging (MRI) tracks demyelination in multiple sclerosis (MS). Brain network changes detected by MRI correlate with myelin loss and behavioral deficits, offering insights into neurodegeneration.

Keywords:

Demyelination MRI Modularity Network Dynamics Remyelination

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Area of Science:

Neuroscience
Immunology
Radiology

Background:

Multiple sclerosis (MS) is an autoimmune CNS disease with inflammatory and neurodegenerative processes.
The relationship between demyelination and neurodegeneration in MS is not fully understood.
Non-invasive tracking of these processes, particularly using MRI brain network characteristics, is an active research area.

Purpose of the Study:

To determine MRI-derived correlates of myelin dynamics.
To test if brain network characteristics from diffusion tensor imaging reflect microstructural reorganization.
To establish the histopathological basis for MRI-detected network changes in immune-mediated neurodegeneration.

Main Methods:

Utilized the cuprizone mouse model for induced demyelination and subsequent remyelination.
Performed longitudinal histological and diffusion tensor imaging (DTI) analyses.
Correlated imaging findings with behavioral tests assessing memory and anxiety.

Main Results:

Cuprizone-induced demyelination reduced myelin content by up to 52% in the corpus callosum and 35% in the neocortex.
DTI showed decreased fractional anisotropy (FA) and increased network modularity and clustering with demyelination.
MRI-detected network changes and FA reduction correlated with impaired memory and anxiety-like behaviors.

Conclusions:

Histological and MRI metrics demonstrated network-specific remyelination, correlating with improved function and reduced neuropsychiatric symptoms.
The study illustrates the histological basis for MRI network responses to demyelination, linking increased modularity to damage and abnormal behavior in MS.
Diffusion-based imaging of microstructural integrity and network characteristics quantitatively reflects in vivo myelination processes.