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Published on: April 13, 2017
Microglia in the context of multiple sclerosis
Xue Zhang1, Fang Chen1, Mingyue Sun1
1Department of Neurology, Binzhou Medical University Hospital, Binzhou, China.
Abstract:
Multiple sclerosis (MS) is an inflammatory and neurodegenerative disease that commonly results in nontraumatic disability in young adults. The characteristic pathological hallmark of MS is damage to myelin, oligodendrocytes, and axons. Microglia provide continuous surveillance in the CNS microenvironment and initiate defensive mechanisms to protect CNS tissue. Additionally, microglia participate in neurogenesis, synaptic refinement, and myelin pruning through the expression and release of different signaling factors. Continuous activation of microglia has been implicated in neurodegenerative disorders. We first review the lifetime of microglia, including the origin, differentiation, development, and function of microglia. We then discuss microglia participate in the whole processes of remyelination and demyelination, microglial phenotypes in MS, and the NF-κB/PI3K-AKT signaling pathway in microglia. The damage to regulatory signaling pathways may change the homeostasis of microglia, which would accelerate the progression of MS.
Insights
Microglia play a key role in multiple sclerosis (MS) by responding to central nervous system (CNS) damage. Dysregulation of microglial signaling pathways can accelerate MS progression.
Area of Science:
- Neuroimmunology
- Neurodegeneration
- Central Nervous System (CNS) Biology
Background:
- Multiple sclerosis (MS) is a primary cause of nontraumatic disability in young adults, characterized by inflammation and neurodegeneration.
- Pathological hallmarks of MS include damage to myelin, oligodendrocytes, and axons within the CNS.
- Microglia, the resident immune cells of the CNS, are crucial for surveillance, defense, neurogenesis, and synaptic plasticity.
Purpose of the Study:
- To review the comprehensive lifecycle of microglia, from origin and development to their diverse functions.
- To elucidate the multifaceted role of microglia in both demyelination and remyelination processes observed in MS.
- To examine specific microglial phenotypes and the involvement of the NF-κB/PI3K-AKT signaling pathway in MS pathogenesis.
Main Methods:
- Literature review focusing on microglial biology and their involvement in multiple sclerosis.
- Analysis of microglial roles in CNS homeostasis and disease states.
- Exploration of signaling pathways implicated in microglial activation and function.
Main Results:
- Microglia are essential for CNS maintenance and respond dynamically to injury.
- Microglial activation and specific phenotypes are implicated in the progression of MS.
- Disruptions in regulatory signaling pathways, such as NF-κB/PI3K-AKT, can alter microglial homeostasis and exacerbate MS.
Conclusions:
- Understanding microglial biology is critical for comprehending MS.
- Microglial dysfunction and aberrant signaling contribute significantly to MS pathology.
- Targeting microglial pathways offers potential therapeutic strategies for managing MS.
