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Project 21

Microglia turnover in neurogenic areas of the nervous system

New neurons are continuously added to three select areas of the adult nervous system, i.e. the olfactory neuroepithelium, the olfactory bulb and the hippocampus. In our research, we are particularly interested in cross-talk between the immune and nervous system in those neurogenic areas. Microglia are important in the phagocytosis of dying cells from the brain. Chronic inflammation of the brain and neurodegenerative diseases impair the neurogenesis process. Thus, to maintain a favourable environment for neuronal replacement, inflammation needs to be prevented upon microglia activation. In the lab, we use a transgenic mouse line in which the marker gene green fluorescent protein (GFP) is selectively expressed in all cells derived from the monocytic lineage, including brain microglia. Using GFP as a marker for brain microglia, this project aims to study activation dynamics and turnover of monocytic cells in neurogenic brain areas where cell death and replacement are naturally occurring.

To study microglia turnover, we are using mouse chimaeras in which the bone marrow of lethally-irradiated mice was reconstituted with that of CX3CR1+/GFP mice, i.e. all monocytic cells derived from the donor bone marrow will express GFP. A comparative analysis of the number of GFP-positive cells within the olfactory epithelium, bulb, subventricular zone and hippocampus will be performed at various time points after transplantation.

Techniques include: Genotyping, tissue processing, immunohistochemistry, image acquisition and analysis, etc.

For more information or other potential projects, please feel free to contact: Marc Ruitenberg (phone: 6488 7513 or email: mruitenberg@anhb.uwa.edu.au)

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