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Updated: Aug 5, 2026
Three-dimensional Confocal Analysis of Microglia/macrophage Markers of Polarization in Experimental Brain Injury
Published on: September 4, 2013
CSF-1 promotes microglial proliferation and ameliorates ischemic brain injury
Shiji Deng1, Qi Li1, Pinyi Liu2
1Department of Neurology, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, China; The State Key Laboratory of Pharmaceutical Biotechnology, Division of Immunology, Medical School, Nanjing University, Nanjing, China.
Colony-stimulating factor 1 (CSF-1) administration improved outcomes in a mouse model of ischemic stroke by promoting microglial proliferation and reducing inflammation. This suggests CSF-1 is a potential therapeutic for mitigating brain injury.
Area of Science:
- Neuroscience
- Immunology
- Cell Biology
Background:
- Microglia are crucial in ischemic stroke pathophysiology, but many die after cerebral ischemia.
- Colony-stimulating factor 1 receptor (CSF1R) ligands, CSF-1 and IL-34, are vital for microglial survival.
Purpose of the Study:
- To investigate if CSF-1 and IL-34 promote microglial proliferation and improve outcomes post-ischemic stroke.
- To explore the effects of CSF-1 on microglial phenotype and inflammatory responses.
Main Methods:
- Used a mouse model of middle cerebral artery occlusion (MCAO) to study ischemic stroke.
- Administered CSF-1 and IL-34, and analyzed microglial morphology, proliferation (Ki67), and inflammatory markers.
- Conducted in vitro studies using oxygen-glucose deprivation (OGD) and co-cultures to assess neuronal apoptosis.
Main Results:
- Endogenous CSF-1 levels changed dynamically within 24 hours post-ischemia.
- CSF-1 treatment significantly improved neurological outcomes and reduced infarct volume in MCAO mice.
- CSF-1 induced a less reactive, homeostatic microglial phenotype with reduced pro-inflammatory cytokine production and phagocytosis.
Conclusions:
- CSF-1, but not IL-34, demonstrated neuroprotective effects in ischemic stroke models.
- CSF-1 promotes microglial proliferation and a shift towards an anti-inflammatory phenotype.
- CSF-1 is a promising therapeutic agent for ischemic brain injury by modulating microglial responses.
