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Updated: Apr 10, 2026
Rat Model of Widespread Cerebral Cortical Demyelination Induced by an Intracerebral Injection of Pro-Inflammatory Cytokines
Published on: September 21, 2021
Anatomical Distribution of Cuprizone-Induced Lesions in C57BL6 Mice
Johannes Goldberg1, Tim Clarner1, Cordian Beyer1
1Institute of Neuroanatomy, Faculty of Medicine, RWTH Aachen University, 52074, Aachen, Germany.
Abstract:
Although multiple sclerosis (MS) has been considered a white matter disease, MS lesions occur frequently in the gray matter parts of the brain. Gray matter demyelination and atrophy are found during earliest disease stages, and a growing body of evidence demonstrates a positive correlation between gray matter pathology and various measures of motor disability and cognitive impairment. The cuprizone model is classically regarded as white matter demyelination model. However, recent evidence suggests that different gray matter areas are also affected. In this study, we address the vulnerability of white and gray matter forebrain regions in the cuprizone model. While the corpus callosum as interhemispheric white matter tract is affected in this model, other white matter tracts such as the mammillo-thalamic tract, the columns of the fornix, the stria terminalis, the optic tract, or hippocampal fimbria do not present overt demyelination after 5-week cuprizone intoxication. In contrast, gray matter demyelination is widespread in this model. Furthermore, vulnerable white matter tracts display extensive acute axonal damage. These results highlight the relevance of the cuprizone model to study MS-related gray matter pathology and neurodegeneration.
Insights
The cuprizone model, used to study multiple sclerosis (MS), shows significant gray matter demyelination, not just white matter damage. This model is relevant for understanding MS-related neurodegeneration and gray matter pathology.
Area of Science:
- Neuroscience
- Pathology
- Demyelinating Diseases
Background:
- Multiple sclerosis (MS) is increasingly recognized to affect gray matter, not solely white matter.
- Gray matter pathology in MS correlates with motor and cognitive impairments.
- The cuprizone model is a common tool for studying demyelination.
Purpose of the Study:
- To investigate the vulnerability of both white and gray matter regions in the forebrain using the cuprizone model.
- To assess the extent of demyelination and axonal damage in specific white and gray matter tracts.
Main Methods:
- Administration of the toxin cuprizone to mice for 5 weeks.
- Histological analysis of brain tissue to identify demyelination and axonal damage.
- Comparative assessment of white matter tracts (e.g., corpus callosum, mammillo-thalamic tract) and gray matter regions.
Main Results:
- Widespread gray matter demyelination was observed in the cuprizone model.
- While the corpus callosum showed demyelination, other white matter tracts were less affected.
- Significant acute axonal damage was found in vulnerable white matter tracts.
- The cuprizone model demonstrates susceptibility of gray matter regions to demyelination.
Conclusions:
- The cuprizone model is suitable for studying gray matter pathology in MS.
- Gray matter demyelination and axonal damage are key features observed in this model.
- This model offers insights into neurodegeneration relevant to multiple sclerosis.
