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Updated: Mar 27, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Complement receptor 3 (CR3)-dependent microglial synapse elimination drives Parkinson's disease pathogenesis in
Lei Cai1,2, Yihe Zhang1, Jiayi Li1
1Jiangsu Key Laboratory of Neurodegeneration, Department of Pharmacology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu, China.
Abstract:
Although systemic inflammation has been implicated in PD pathogenesis, the underlying mechanisms remain poorly understood. In this study, we investigate the pathological events in a systemic inflammation-induced PD mouse model. We demonstrate that synaptic loss in the midbrain occurs as early as 1 day after the final lipopolysaccharide (LPS) administration, preceding dopaminergic (DA) neuron degeneration, which was observed only at later stages (14 days). Early microglial activation in the midbrain is detected, accompanied by excessive synaptic engulfment, suggesting a critical role of microglia-dependent synapse elimination in PD pathogenesis. Furthermore, we identify the complement receptor 3 (CR3) as a key mediator of microglial synaptic engulfment, revealing that its inhibition rescues synaptic integrity and prevents neurodegeneration. Our results contribute to a deeper understanding of early events of PD progression driven by systemic inflammation and provide early intervention strategies targeting microglial complement signaling to halt PD progression.
Insights
Systemic inflammation triggers early synaptic loss in Parkinson's disease (PD) models, preceding neuron death. Targeting microglial complement signaling, specifically complement receptor 3 (CR3), offers a potential early intervention for PD.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Systemic inflammation is linked to Parkinson's disease (PD) pathogenesis.
- The precise mechanisms driving PD progression due to systemic inflammation are not fully understood.
Purpose of the Study:
- To investigate the pathological events in a mouse model of systemic inflammation-induced PD.
- To elucidate the role of microglia and synaptic changes in early PD development.
Main Methods:
- Utilized a lipopolysaccharide (LPS)-induced systemic inflammation mouse model.
- Monitored synaptic loss, dopaminergic (DA) neuron degeneration, and microglial activation over time.
- Investigated the role of complement receptor 3 (CR3) in microglial synaptic engulfment.
Main Results:
- Synaptic loss in the midbrain occurred rapidly (1 day post-LPS), preceding DA neuron degeneration (14 days post-LPS).
- Early microglial activation and excessive synaptic engulfment were observed.
- Inhibition of CR3 prevented synaptic loss and neurodegeneration.
Conclusions:
- Microglia-dependent synapse elimination is a critical early event in PD pathogenesis driven by systemic inflammation.
- CR3 is a key mediator of this microglial synaptic engulfment.
- Targeting microglial complement signaling presents a promising early intervention strategy for PD.
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