Related Experiment Video
Updated: Jun 9, 2025
10:52
Correlative Light and Electron Microscopy to Study Microglial Interactions with β-Amyloid Plaques
Published on: June 1, 2016
11.3K
Three-dimensional view of microglia-amyloid plaque interactions
Maria Gotkiewicz1, Janne Capra2, Pasi O Miettinen1
1University of Eastern Finland, A.I. Virtanen Institute, Kuopio, Finland.
Glia
|October 22, 2024
Summary
Microglia exhibit distinct morphologies when interacting with amyloid plaques in Alzheimer's disease models. These cellular changes, including "snowplower" end-feet and CD68-filled structures, suggest active plaque compaction and phagocytosis.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Gene expression studies identify ~10 microglial states, some linked to Alzheimer's-like amyloid pathology.
- The morphological correlates of microglial interaction with amyloid plaques remain poorly understood.
Purpose of the Study:
- To investigate the detailed morphological features of microglia interacting with amyloid plaques.
- To understand how microglial morphology relates to amyloid plaque structure and composition.
Main Methods:
- Utilized optimized confocal microscopy in APP/PS1 transgenic mice.
- Analyzed microglia-amyloid plaque interactions, focusing on process extension and end-feet morphology.
Main Results:
- Microglial contacts varied significantly between diffuse and fibrillar amyloid plaques.
- Identified "snowplower" microglia with enlarged, CD68-positive end-feet engulfing plaque cores.
- Observed Apolipoprotein E (ApoE) surrounding fibrillar cores and larger diffuse plaques, positioned between amyloid and microglial end-feet.
- Found amyloid within perinuclear vesicles of some microglia, suggesting phagocytosis.
Conclusions:
- Microglial morphology reflects active engagement with amyloid plaques, including compaction and phagocytosis.
- Apolipoprotein E (ApoE) may guide microglial interactions with amyloid plaques, potentially playing a chemotactic role.
