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MKP-1 regulates the inflammatory activation of microglia against Alzheimer's disease
Junhua Li1,2, Lin Wang3, Qinhua Zeng1,2
1Institute of Neuroscience, Basic Medical College, Chongqing Medical University, Chongqing, China.
Background:
Alzheimer's disease (AD) is one of the most common neurodegenerative diseases leading to dementia in elderly people. Microglia-mediated neuroinflammation plays an important role in AD pathogenesis, so modulation of neuroinflammation has emerged as an essential therapeutic method to improve AD. The current study aims to investigate whether MKP-1 can regulate microglia phenotype and inflammatory factor release in AD and explore its possible mechanisms.
Methods:
Amyloid precursor protein/PS1 double transgenic mice and wild-type mice were selected to study the locations of microglia and amyloid-β (Aβ) plaques in different regions of mice brains. Changes in MKP-1 of microglia were detected using AD model mice and AD model cells. Changes in phenotype and the release of inflammatory factors within immortalized BV2 murine microglia were investigated by regulating the expression of MKP-1.
Results:
The distribution of microglia and Aβ plaques in the AD brain was region-specific. MKP-1 expression was downregulated in AD mice, and in vitro, with increasing Aβ concentrations, MKP-1 expression was reduced. MKP-1 over-expression increased M2 microglia but decreased M1 microglia accompanied by changes in inflammatory factors and inhibition of MKP-1 yielded the opposite result.
Conclusion:
MKP-1 regulated microglia phenotype and inflammatory factor release in AD through modulation of the p38 signaling pathway.
Insights
MKP-1 (mitogen-activated protein kinase phosphatase-1) regulates microglia, key cells in Alzheimer's disease (AD) inflammation. Boosting MKP-1 may reduce harmful inflammatory responses in AD.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Alzheimer's disease (AD) is a leading cause of dementia in the elderly.
- Microglia-mediated neuroinflammation is a critical factor in AD pathogenesis.
- Modulating neuroinflammation is a promising therapeutic strategy for AD.
Purpose of the Study:
- To investigate the role of MKP-1 in regulating microglia phenotype in AD.
- To determine if MKP-1 influences inflammatory factor release in AD.
- To explore the underlying mechanisms of MKP-1's action in AD.
Main Methods:
- Utilized amyloid precursor protein/PS1 double transgenic mice and wild-type controls.
- Examined microglia and amyloid-beta (Aβ) plaque distribution in brain regions.
- Assessed MKP-1 expression in microglia from AD models (mice and cells).
- Investigated microglia phenotype and inflammatory factor release by manipulating MKP-1 expression in BV2 cells.
Main Results:
- Microglia and Aβ plaque distribution showed region-specific patterns in AD brains.
- MKP-1 expression was found to be downregulated in AD mice and decreased with increasing Aβ concentrations in vitro.
- Overexpression of MKP-1 promoted an M2 microglia phenotype and reduced M1 microglia, altering inflammatory factor release.
- Inhibition of MKP-1 produced opposite effects on microglia phenotype and inflammation.
Conclusions:
- MKP-1 plays a significant role in modulating microglia phenotype and inflammatory factor release in the context of Alzheimer's disease.
- The p38 signaling pathway is implicated as a key mechanism through which MKP-1 exerts its regulatory effects in AD.
- Targeting MKP-1 represents a potential therapeutic avenue for managing neuroinflammation in Alzheimer's disease.
