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Updated: Sep 30, 2026
Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
Published on: January 30, 2014
Local proliferation of microglia cells in response to neocortical injury in vitro
David A Eliason1, Seth A Cohen, Janie Baratta
1Department of Anatomy and Neurobiology, College of Medicine, University of California, Irvine, Irvine, CA , USA.
Abstract:
Studies examined whether increased numbers of microglia following neural damage result from induced mitotic activity of resident microglia in situ. Organotypic slice cultures of neocortex were maintained for 1 week prior to placement of lesions. Increased numbers of OX-6 or tomato lectin labeled microglial cells were detected 1-8 days following lesions. Administration of BrdU to the cultures demonstrated lectin and BrdU double labeled microglial cells, conclusively demonstrating that a portion of the microglial cells were generated by local mitotic activity in situ.
Insights
Following neural damage, resident microglia (immune cells in the brain) can multiply through cell division in situ. This study confirms local mitotic activity contributes to increased microglia numbers after injury.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Neural damage triggers an increase in microglia, the brain's resident immune cells.
- The origin of these increased microglia numbers (proliferation vs. recruitment) has been debated.
Purpose of the Study:
- To investigate whether increased microglia numbers after neural damage result from local cell division (mitosis) of resident microglia.
- To provide conclusive evidence for in situ microglial proliferation.
Main Methods:
- Organotypic neocortical slice cultures were used.
- Lesions were induced in the cultures.
- Bromodeoxyuridine (BrdU) labeling was administered to track cell proliferation.
- Immunohistochemistry was performed using markers for microglia (OX-6, tomato lectin) and BrdU.
Main Results:
- Increased numbers of microglia (labeled with OX-6 or tomato lectin) were observed 1-8 days post-lesion.
- A significant population of microglia were found to be double-labeled for both lectin and BrdU.
- This dual labeling confirmed that a portion of the microglia population underwent cell division within the brain slices.
Conclusions:
- Resident microglia in the central nervous system can proliferate in response to neural injury.
- Local mitotic activity of microglia contributes to the cellular response following brain damage.
- This finding clarifies the source of increased microglia in damaged brain tissue.
