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Published on: March 26, 2015
Myelin debris regulates inflammatory responses in an experimental demyelination animal model and multiple sclerosis
Tim Clarner1, Felix Diederichs, Katharina Berger
1Institute of Neuroanatomy, Faculty of Medicine, RWTH Aachen University, Aachen, Germany.
Abstract:
In multiple sclerosis (MS), gray matter pathology is characterized by less pronounced inflammation when compared with white matter lesions. Although regional differences in the cytoarchitecture may account for these differences, the amount of myelin debris in the cortex during a demyelinating event might also be contributory. To analyze the association between myelin debris levels and inflammatory responses, cortical areas with distinct and sparse myelination were analyzed for micro- and astrogliosis before and after cuprizone-induced demyelination in mice. In postmortem tissue of MS patients, leucocortical lesions were assessed for the type and level of inflammation in the cortical and white matter regions of the lesion. Furthermore, mice were injected intracerebrally with myelin-enriched debris, and the inflammatory response analyzed in white and grey matter areas. Our studies show that the magnitude of myelin loss positively correlates with microgliosis in the cuprizone model. In MS, the number of MHC class II expressing cells is higher in the white compared with the grey matter part of leucocortical lesions. Finally, direct application of myelin debris into the corpus callosum or cortex of mice induces profound and comparable inflammation in both regions. Our data suggest that myelin debris is an important variable in the inflammatory response during demyelinating events. Whether myelin-driven inflammation affects neuronal integrity remains to be clarified.
Insights
Myelin debris accumulation correlates with inflammation in multiple sclerosis (MS) gray matter. This study reveals myelin debris drives inflammation in both gray and white matter, impacting demyelinating disease progression.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Gray matter pathology in multiple sclerosis (MS) exhibits less inflammation than white matter lesions.
- Regional cytoarchitectural differences and myelin debris accumulation may explain this inflammatory disparity.
Purpose of the Study:
- To investigate the association between myelin debris levels and inflammatory responses in gray and white matter.
- To analyze the role of myelin debris in driving inflammation during demyelination.
Main Methods:
- Cuprizone-induced demyelination model in mice to assess microgliosis and astrogliosis in cortical areas.
- Analysis of postmortem MS patient tissue (leucocortical lesions) for inflammation in cortical and white matter regions.
- Intracerebral injection of myelin debris in mice to evaluate inflammatory responses in gray and white matter.
Main Results:
- Myelin loss magnitude positively correlates with microgliosis in the cuprizone model.
- Higher numbers of MHC class II expressing cells were observed in white matter compared to gray matter of leucocortical lesions in MS patients.
- Direct application of myelin debris induced comparable inflammation in both corpus callosum (white matter) and cortex (gray matter) of mice.
Conclusions:
- Myelin debris is a significant factor influencing the inflammatory response during demyelinating events.
- The presence of myelin debris can drive comparable inflammation in both gray and white matter.
- Further research is needed to determine if myelin-driven inflammation impacts neuronal integrity.
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