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Published on: January 30, 2014
Microglia, major player in the brain inflammation: their roles in the pathogenesis of Parkinson's disease
1Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10021, USA. yok2001@med.cornell.edu
Abstract:
Inflammation, a self-defensive reaction against various pathogenic stimuli, may become harmful self-damaging process. Increasing evidence has linked chronic inflammation to a number of neurodegenerative disorders including Alzheimer's disease (AD), Parkinson's disease (PD), and multiple sclerosis. In the central nervous system, microglia, the resident innate immune cells play major role in the inflammatory process. Although they form the first line of defense for the neural parenchyma, uncontrolled activation of microglia may directly toxic to neurons by releasing various substances such as inflammatory cytokines (IL-1beta, TNF-alpha, IL-6), NO, PGE(2), and superoxide. Moreover, our recent study demonstrated that activated microglia phagocytose not only damaged cell debris but also neighboring intact cells. It further supports their active participation in self-perpetuating neuronal damaging cycles. In the following review, we discuss microglial responses to damaging neurons, known activators released from injured neurons and how microglia cause neuronal degeneration. In the last part, microglial activation and their role in PD are discussed in depth.
Insights
Chronic inflammation contributes to neurodegenerative diseases like Alzheimer's and Parkinson's. Activated microglia, immune cells in the brain, can harm neurons, exacerbating these conditions.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Inflammation is a defense mechanism that can become detrimental.
- Chronic inflammation is linked to neurodegenerative diseases such as Alzheimer's disease (AD), Parkinson's disease (PD), and multiple sclerosis.
- Microglia are the primary immune cells in the central nervous system, playing a key role in neuroinflammation.
Purpose of the Study:
- To review microglial responses to neuronal damage.
- To discuss activators released by injured neurons.
- To explore how microglia contribute to neuronal degeneration, with a focus on Parkinson's disease.
Main Methods:
- Literature review of microglial activation and neuroinflammation.
- Analysis of the role of microglia in neuronal damage.
- In-depth discussion of microglial involvement in Parkinson's disease.
Main Results:
- Uncontrolled microglial activation can be toxic to neurons.
- Microglia release inflammatory cytokines (e.g., IL-1beta, TNF-alpha, IL-6), nitric oxide (NO), PGE(2), and superoxide.
- Activated microglia phagocytose not only debris but also intact neighboring cells, perpetuating neuronal damage cycles.
Conclusions:
- Microglia are critical in neuroinflammation and neurodegenerative processes.
- Understanding microglial behavior is key to developing treatments for diseases like Parkinson's.
- Dysregulated microglial activity contributes significantly to neuronal loss in neurodegenerative disorders.
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