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Glial response during cuprizone-induced de- and remyelination in the CNS: lessons learned
Viktoria Gudi1, Stefan Gingele1, Thomas Skripuletz1
1Department of Neurology, Hannover Medical School Hannover, Germany.
Abstract:
Although astrogliosis and microglia activation are characteristic features of multiple sclerosis (MS) and other central nervous system (CNS) lesions the exact functions of these events are not fully understood. Animal models help to understand the complex interplay between the different cell types of the CNS and uncover general mechanisms of damage and repair of myelin sheaths. The so called cuprizone model is a toxic model of demyelination in the CNS white and gray matter, which lacks an autoimmune component. Cuprizone induces apoptosis of mature oligodendrocytes that leads to a robust demyelination and profound activation of both astrocytes and microglia with regional heterogeneity between different white and gray matter regions. Although not suitable to study autoimmune mediated demyelination, this model is extremely helpful to elucidate basic cellular and molecular mechanisms during de- and particularly remyelination independently of interactions with peripheral immune cells. Phagocytosis and removal of damaged myelin seems to be one of the major roles of microglia in this model and it is well known that removal of myelin debris is a prerequisite of successful remyelination. Furthermore, microglia provide several signals that support remyelination. The role of astrocytes during de- and remyelination is not well defined. Both supportive and destructive functions have been suggested. Using the cuprizone model we could demonstrate that there is an important crosstalk between astrocytes and microglia. In this review we focus on the role of glial reactions and interaction in the cuprizone model. Advantages and limitations of as well as its potential therapeutic relevance for the human disease MS are critically discussed in comparison to other animal models.
Insights
The cuprizone model reveals that microglia clear myelin debris, supporting remyelination in the central nervous system (CNS). Astrocytes and microglia interactions are crucial for understanding demyelinating diseases like multiple sclerosis (MS).
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Astrogliosis and microglia activation are hallmarks of central nervous system (CNS) lesions, including multiple sclerosis (MS).
- The precise roles of these glial cells in CNS damage and repair remain incompletely understood.
- Animal models are essential for dissecting the complex cellular interactions in the CNS.
Purpose of the Study:
- To investigate the roles of astrocytes and microglia in demyelination and remyelination using the cuprizone model.
- To elucidate the cellular and molecular mechanisms underlying myelin repair independently of autoimmune responses.
- To explore the crosstalk between astrocytes and microglia during the demyelination-remyelination cycle.
Main Methods:
- Utilizing the cuprizone model, a toxic demyelination paradigm in rodents.
- Analyzing glial activation (astrocytes and microglia) and oligodendrocyte apoptosis.
- Assessing myelin debris clearance and remyelination processes.
- Investigating the interactions between astrocytes and microglia.
Main Results:
- Cuprizone induces oligodendrocyte apoptosis, leading to significant demyelination and activation of astrocytes and microglia.
- Microglia play a key role in phagocytosing myelin debris, a critical step for remyelination.
- Evidence of significant crosstalk between astrocytes and microglia was observed.
- Regional heterogeneity in glial responses was noted between white and gray matter.
Conclusions:
- The cuprizone model effectively dissects basic mechanisms of de- and remyelination, particularly glial roles.
- Microglia are essential for clearing myelin debris and signaling for remyelination.
- Astrocytes exhibit complex, potentially dual roles in de- and remyelination.
- Understanding astrocyte-microglia interactions is vital for potential therapeutic strategies in MS.
