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Related Experiment Video

Updated: Apr 18, 2026

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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
PubMed
Summary
This summary is machine-generated.

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.

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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.