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Transcriptomic Analysis Divulges Differential Expressions of Microglial Genes After Microglial Repopulation in Mice.
Muhammad Tariq Hafeez1, Hao Gao1, Furong Ju1
1Gansu Key Laboratory of Biomonitoring and Bioremediation for Environmental Pollution, School of Life Sciences, Lanzhou University, Lanzhou 730000, China.
International Journal of Molecular Sciences
|February 26, 2025
Summary
Microglial depletion triggers rapid repopulation, with significant gene expression changes related to cell proliferation and activation observed within days. Understanding these transcriptomic shifts is crucial for unraveling microglial renewal mechanisms in CNS diseases.
Area of Science:
- Neuroscience
- Immunology
- Genomics
Background:
- Microglia are essential immune cells in the central nervous system (CNS), maintaining homeostasis.
- While microglia rapidly repopulate after depletion, the underlying gene expression and signaling pathways are not fully understood.
Purpose of the Study:
- To investigate the transcriptomic changes and signaling pathways involved in microglial repopulation following depletion.
- To elucidate the regulatory mechanisms of microglial activation and renewal.
Main Methods:
- Utilized a conditional genetic microglial depletion model (CX3CR1CreER/+ system) in mice.
- Performed RNA sequencing (RNA-Seq) to profile the transcriptome of depleted CNS tissue.
- Conducted differential gene expression (DGE) and Gene Ontology (GO) analyses.
- Performed histological analysis to confirm microglial proliferation and activation.
Main Results:
- Identified 1226 differentially expressed genes (up- and downregulated) in microglia-depleted tissue compared to controls.
- Observed significant gene regulation on day 3 post-depletion, with a reduction by day 7.
- GO analysis revealed enrichment of genes involved in cell proliferation, activation, and cytokine/chemokine production.
- Histological data confirmed microglial proliferation and activation between days 3 and 7 post-depletion.
Conclusions:
- Transcriptomic alterations during microglial depletion are critical for microglial renewal and activation.
- The findings provide insights into the regulatory mechanisms of microglial activation, relevant to CNS disease conditions.
