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Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
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Transcriptomic analysis of purified human cortical microglia reveals age-associated changes
Thais F Galatro1,2, Inge R Holtman1, Antonio M Lerario3
1Department of Neuroscience, Section Medical Physiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands.
Nature Neuroscience
|July 4, 2017
Summary
Human microglia gene expression is similar to mouse, but with unique immune genes. Age-associated changes differ between human and mouse microglia, indicating distinct aging processes.
Area of Science:
- Neuroscience
- Immunology
- Genetics
Background:
- Microglia are key immune cells in the central nervous system (CNS), crucial for maintaining brain health and function.
- They play significant roles in neurodegenerative diseases and the aging process of the brain.
Purpose of the Study:
- To characterize the gene expression profile of human microglia from cognitively intact individuals.
- To compare human microglial gene expression with mouse microglia and investigate age-associated changes in humans.
Main Methods:
- Purification of microglia from post-mortem parietal cortex samples of 39 human subjects.
- Analysis of gene expression profiles to identify expressed genes and compare them between species and age groups.
Main Results:
- Human microglia share core genes with mouse microglia (e.g., CX3CR1, P2RY12, ITGAM).
- Human microglia uniquely express abundant immune genes like TLR, Fcγ, SIGLEC receptors, and regulators TAL1 and IFI16.
- Age-associated changes in human microglia involve genes related to cell adhesion, axonal guidance, receptor expression, and actin dynamics.
Conclusions:
- Human and mouse microglia share fundamental similarities but exhibit species-specific immune gene expression.
- Microglial aging processes differ significantly between humans and mice, highlighting the need for caution when extrapolating findings from animal models.
- These findings provide insights into human microglial function and aging, relevant for neurodegeneration and brain health research.
