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Published on: January 7, 2014
Depletion of CD169+ border-associated macrophages induces Parkinson's disease-like behavior
Takuto Ohki1, Kai Kitamura2, Katsuhiro Tokutake1
1Department of Hand Surgery, Nagoya University School of Medicine, Nagoya, Japan.
Abstract:
Parkinson's disease (PD) and Alzheimer's disease (AD) present with complex behavioral symptoms that can arise in the absence of overt structural brain damage. Recent evidence suggests that border-associated macrophages (BAMs) located at the brain's interfaces regulate central nervous system function, yet the specific roles of distinct BAM subsets remain largely undefined. By reanalyzing single-nucleus RNA sequencing data from postmortem PD brains, we identified a BAM subset expressing CD169 that was significantly reduced in patients compared with controls. To examine their function, we employed CD169-DTR mice to selectively ablate CD169+ BAMs and evaluated behavioral and histological changes. Depletion of CD169+ BAMs induced tremors, abnormal hindlimb reflexes, and heightened anxiety-like behavior without dopaminergic neuron loss. Histological analysis revealed a pronounced reduction of mitral and tufted cells in the olfactory bulb, indicating disruption of olfactory-limbic circuitry. These findings demonstrate that CD169+ BAMs are critical for maintaining neural network stability and motor function, and that their loss can elicit PD-like phenotypes in the absence of classical dopaminergic neurodegeneration. This work establishes a novel mouse model linking brain-border immune cell dysfunction to Parkinsonian pathology and highlights a neuroimmune mechanism that may contribute to the onset of PD-like disorders.
Insights
Loss of specific brain immune cells, CD169+ border-associated macrophages (BAMs), triggers Parkinson's disease-like behaviors without neurodegeneration. This discovery highlights a novel neuroimmune link to Parkinsonian pathology.
Area of Science:
- Neuroimmunology
- Neuroscience
- Pathology
Background:
- Parkinson's disease (PD) and Alzheimer's disease (AD) exhibit complex behavioral symptoms without apparent structural brain damage.
- Border-associated macrophages (BAMs) at brain interfaces regulate central nervous system (CNS) function, but distinct subset roles are unclear.
- Specific roles of BAM subsets in neurodegenerative diseases require further investigation.
Purpose of the Study:
- To identify specific BAM subsets involved in Parkinson's disease (PD) pathology.
- To investigate the functional role of CD169+ BAMs in the CNS.
- To establish a novel model linking immune cell dysfunction to Parkinsonian phenotypes.
Main Methods:
- Reanalysis of single-nucleus RNA sequencing data from postmortem PD brains.
- Utilized CD169-DTR mice for selective ablation of CD169+ BAMs.
- Evaluated behavioral and histological changes following BAM depletion.
Main Results:
- A subset of CD169+ BAMs was significantly reduced in PD patients.
- Depletion of CD169+ BAMs induced tremors, abnormal reflexes, and anxiety-like behavior.
- Histological analysis showed reduced mitral and tufted cells in the olfactory bulb, disrupting olfactory-limbic circuitry, without dopaminergic neuron loss.
Conclusions:
- CD169+ BAMs are crucial for neural network stability and motor function.
- Loss of CD169+ BAMs can induce Parkinsonian phenotypes independent of dopaminergic neurodegeneration.
- This study reveals a neuroimmune mechanism contributing to PD-like disorders.
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