Related Experiment Video
Updated: May 2, 2026
Detection of Neuritic Plaques in Alzheimer's Disease Mouse Model
Published on: July 26, 2011
Accelerated microglial pathology is associated with Aβ plaques in mouse models of Alzheimer's disease
Rona Baron1, Alicia A Babcock, Anna Nemirovsky
1The Shraga Segal Department of Microbiology and Immunology, Faculty of Health Sciences and the National Institute of Biotechnology in the Negev, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel.
Abstract:
Microglia integrate within the neural tissue with a distinct ramified morphology through which they scan the surrounding neuronal network. Here, we used a digital tool for the quantitative morphometric characterization of fine cortical microglial structures in mice, and the changes they undergo with aging and in Alzheimer's-like disease. We show that, compared with microglia in young mice, microglia in old mice are less ramified and possess fewer branches and fine processes along with a slightly increased proinflammatory cytokine expression. A similar microglial pathology appeared 6-12 months earlier in mouse models of Alzheimer's disease (AD), along with a significant increase in brain parenchyma lacking coverage by microglial processes. We further demonstrate that microglia near amyloid plaques acquire unique activated phenotypes with impaired process complexity. We thus show that along with a chronic proinflammatory reaction in the brain, aging causes a significant reduction in the capacity of microglia to scan their environment. This type of pathology is markedly accelerated in mouse models of AD, resulting in a severe microglial process deficiency, and possibly contributing to enhanced cognitive decline.
Insights
Aging and Alzheimer's disease impair microglia's ability to scan the brain. These immune cells lose their complex structures, reducing their surveillance capacity and potentially worsening cognitive decline.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are the primary immune cells in the central nervous system.
- They possess a ramified morphology essential for surveying the neuronal environment.
- Aging and neurodegenerative diseases like Alzheimer's disease (AD) are known to affect microglial function.
Purpose of the Study:
- To quantitatively characterize microglial morphology in aging and Alzheimer's-like disease mouse models.
- To investigate the impact of aging and AD on microglial surveillance capacity.
- To explore microglial phenotypes near amyloid plaques.
Main Methods:
- Quantitative morphometric analysis of cortical microglia using a digital tool.
- Comparison of microglial structures in young, aged, and AD model mice.
- Assessment of proinflammatory cytokine expression.
- Analysis of microglial process coverage of brain parenchyma.
Main Results:
- Aged mice exhibited reduced microglial ramification, fewer branches, and decreased fine processes compared to young mice.
- A similar, but accelerated, microglial pathology was observed in AD models.
- Microglia near amyloid plaques displayed altered phenotypes with reduced process complexity.
- Aging led to a significant reduction in microglial environmental scanning capacity, exacerbated in AD models.
Conclusions:
- Aging impairs microglial surveillance due to reduced process complexity and increased inflammation.
- This microglial pathology is accelerated in Alzheimer's disease models, leading to significant process deficiency.
- The findings suggest a link between impaired microglial function, chronic inflammation, and cognitive decline in aging and AD.
More Related Videos
Related Concept Videos
01:23Alzheimer Disease ll: Pathophysiology
01:29Alzheimer Disease l: Introduction
01:26Alzheimer's Disease: Overview
The clinical diagnosis of AD hinges on the presence of memory and other cognitive impairments. Biomarkers, such as changes in Aβ...