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Characterization and Isolation of Mouse Primary Microglia by Density Gradient Centrifugation
Published on: February 16, 2018
Axonal lesion-induced microglial proliferation and microglial cluster formation in the mouse
L Dissing-Olesen1, R Ladeby, H H Nielsen
1Medical Biotechnology Center, University of Southern Denmark, Winsloewparken 25, 2, DK-5000 Odense, Denmark. ldolesen@health.sdu.dk
Neuroscience
|September 18, 2007
Summary
Microglia, the brain's immune cells, proliferate rapidly after axonal injury in mice, a process previously studied in rats. This study details their early proliferation, clustering, and surface marker expression following CNS injury.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are the primary immune cells of the central nervous system (CNS).
- Microglial proliferation is crucial for CNS immune responses during acute injury.
- Previous studies characterized microglial proliferation in rats, but not in mice.
Purpose of the Study:
- To investigate axonal-lesion-induced microglial proliferation in C57BL/6 mice.
- To analyze surface antigen expression on activated microglia post-axonal injury.
- To provide insights into early microglial activation dynamics and cluster formation in mice.
Main Methods:
- Induction of axonal injury via transection of the entorhino-dentate perforant path projection.
- Time-course analysis of microglial activation and proliferation.
- Immunohistochemistry using markers for microglia (macrophage antigen-1), proliferation (bromodeoxyuridine), intercellular adhesion molecule-1, and cluster of differentiation 34.
Main Results:
- Significant microglial proliferation observed within 24 hours post-lesion, peaking at 3 days.
- Lesion-reactive microglia constituted the majority of proliferating cells.
- Activated, proliferating microglia formed multicellular clusters and expressed intercellular adhesion molecule-1 and cluster of differentiation 34.
Conclusions:
- Axonal injury triggers rapid microglial proliferation in mice, similar to rats.
- Early microglial proliferation, clustering, and specific surface antigen expression are key features of the CNS response to injury in mice.
