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A microglia depletion deep dive
Vishal A Kanigicherla1, Eli M Levitt1, F Chris Bennett1
1Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA; Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA.
Neuron
|April 16, 2026
Summary
PLX5622 is a common tool for studying microglia. New research reveals it affects non-microglial cells, offering a better way to interpret microglia depletion studies.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- PLX5622 is a CSF1R inhibitor widely used to deplete microglia in research.
- Microglia play crucial roles in brain health and disease.
- Previous studies using PLX5622 have attributed observed phenotypes solely to microglia.
Purpose of the Study:
- To investigate the off-target effects of PLX5622.
- To identify non-microglial cells affected by PLX5622.
- To provide a framework for re-interpreting microglia depletion studies.
Main Methods:
- Utilized PLX5622 in a mouse model.
- Performed single-cell RNA sequencing (scRNA-seq) on brain tissue.
- Analyzed gene expression profiles to identify cellular responses.
Main Results:
- PLX5622 significantly impacts non-microglial cells, including astrocytes and endothelial cells.
- Observed phenotypes previously attributed to microglia depletion are partially driven by these non-microglial effects.
- Identified specific molecular pathways affected in non-microglial populations.
Conclusions:
- PLX5622 is not a specific microglia-depleting agent.
- Researchers must account for PLX5622's effects on other cell types.
- This study provides critical insights for the accurate interpretation of microglia research.
