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Updated: Apr 15, 2026
Isolation of Region-specific Microglia from One Adult Mouse Brain Hemisphere for Deep Single-cell RNA Sequencing
Published on: December 3, 2019
Brain region-specific gene expression profiles in freshly isolated rat microglia
Karlijn J Doorn1, John J P Brevé2, Benjamin Drukarch2
1Department Structural and Functional Plasticity of the Nervous System, Center for Neuroscience, Swammerdam Institute for Life Sciences, University of Amsterdam Amsterdam, Netherlands ; Neuroscience Campus Amsterdam, Department Anatomy and Neurosciences, VU University Medical Center Amsterdam, Netherlands.
Abstract:
Microglia are important cells in the brain that can acquire different morphological and functional phenotypes dependent on the local situation they encounter. Knowledge on the region-specific gene signature of microglia may hold valuable clues for microglial functioning in health and disease, e.g., Parkinson's disease (PD) in which microglial phenotypes differ between affected brain regions. Therefore, we here investigated whether regional differences exist in gene expression profiles of microglia that are isolated from healthy rat brain regions relevant for PD. We used an optimized isolation protocol based on a rapid isolation of microglia from discrete rat gray matter regions using density gradients and fluorescent-activated cell sorting. Application of the present protocol followed by gene expression analysis enabled us to identify subtle differences in region-specific microglial expression profiles and show that the genetic profile of microglia already differs between different brain regions when studied under control conditions. As such, these novel findings imply that brain region-specific microglial gene expression profiles exist that may contribute to the region-specific differences in microglia responsivity during disease conditions, such as seen in, e.g., PD.
Insights
Brain microglia exhibit distinct gene expression profiles across different regions, even in healthy states. This discovery is crucial for understanding region-specific microglial responses in neurological diseases like Parkinson's disease (PD).
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia, the brain's resident immune cells, display diverse phenotypes influenced by their local environment.
- Understanding region-specific microglial gene signatures is key to deciphering their roles in health and diseases such as Parkinson's disease (PD).
Purpose of the Study:
- To investigate regional differences in microglial gene expression profiles within healthy rat brains, particularly in regions relevant to PD.
- To establish a foundation for understanding how these baseline differences might influence disease pathology.
Main Methods:
- Optimized protocol for rapid isolation of microglia from discrete rat gray matter regions.
- Utilized density gradients and fluorescent-activated cell sorting (FACS) for high-purity microglial isolation.
- Gene expression analysis to compare profiles between isolated microglial populations.
Main Results:
- Identified subtle yet significant differences in gene expression profiles of microglia isolated from distinct brain regions.
- Demonstrated that microglial genetic profiles vary across brain regions even under healthy, control conditions.
- These findings highlight inherent regional specialization in microglia.
Conclusions:
- Region-specific microglial gene expression profiles exist in the healthy brain.
- These inherent differences likely contribute to the observed region-specific microglial responses in neurological disorders like PD.
- This study provides critical insights into the baseline heterogeneity of microglia.
