Related Experiment Video
Updated: Oct 10, 2025
Primary Microglia Isolation from Mixed Glial Cell Cultures of Neonatal Rat Brain Tissue
Published on: August 15, 2012
Treatment With the CSF1R Antagonist GW2580, Sensitizes Microglia to Reactive Oxygen Species
Katiria Soto-Diaz1, Mario Vailati-Riboni2, Allison Y Louie1
1Neuroscience Program, University of Illinois at Urbana-Champaign, Urbana, IL, United States.
Abstract:
Microglia activation and proliferation are hallmarks of many neurodegenerative disorders and may contribute to disease pathogenesis. Neurons actively regulate microglia survival and function, in part by secreting the microglia mitogen interleukin (IL)-34. Both IL-34 and colony stimulating factor (CSF)-1 bind colony stimulating factor receptor (CSFR)1 expressed on microglia. Systemic treatment with central nervous system (CNS) penetrant, CSFR1 antagonists, results in microglia death in a dose dependent matter, while others, such as GW2580, suppress activation during disease states without altering viability. However, it is not known how treatment with non-penetrant CSF1R antagonists, such as GW2580, affect the normal physiology of microglia. To determine how GW2580 affects microglia function, C57BL/6J mice were orally gavaged with vehicle or GW2580 (80mg/kg/d) for 8 days. Body weights and burrowing behavior were measured throughout the experiment. The effects of GW2580 on circulating leukocyte populations, brain microglia morphology, and the transcriptome of magnetically isolated adult brain microglia were determined. Body weights, burrowing behavior, and circulating leukocytes were not affected by treatment. Analysis of Iba-1 stained brain microglia indicated that GW2580 treatment altered morphology, but not cell number. Analysis of RNA-sequencing data indicated that genes related to reactive oxygen species (ROS) regulation and survival were suppressed by treatment. Treatment of primary microglia cultures with GW2580 resulted in a dose-dependent reduction in viability only when the cells were concurrently treated with LPS, an inducer of ROS. Pre-treatment with the ROS inhibitor, YCG063, blocked treatment induced reductions in viability. Finally, GW2580 sensitized microglia to hydrogen peroxide induced cell death. Together, these data suggest that partial CSF1R antagonism may render microglia more susceptible to reactive oxygen and nitrogen species.
Insights
GW2580, a colony stimulating factor receptor 1 (CSF1R) antagonist, alters microglia morphology and survival pathways without affecting body weight or behavior. This suggests partial CSF1R antagonism sensitizes microglia to oxidative stress.
Area of Science:
- Neuroscience
- Immunology
- Pharmacology
Background:
- Microglia, the brain's immune cells, are implicated in neurodegenerative diseases.
- Interleukin-34 (IL-34) and colony stimulating factor-1 (CSF-1) regulate microglia survival and function via CSF1R.
- The effects of non-CNS-penetrant CSF1R antagonists on normal microglia physiology are not well understood.
Purpose of the Study:
- To investigate the impact of the non-penetrant CSF1R antagonist GW2580 on microglia function and physiology in healthy mice.
- To determine if GW2580 affects microglia viability, morphology, or gene expression.
- To assess the susceptibility of GW2580-treated microglia to oxidative stress.
Main Methods:
- C57BL/6J mice were treated with GW2580 (80mg/kg/d) or vehicle for 8 days.
- Assessed body weight, burrowing behavior, circulating leukocytes, and microglia morphology (Iba-1 staining).
- Analyzed microglia transcriptome via RNA-sequencing and tested viability in primary cultures with LPS and ROS inhibitors.
Main Results:
- GW2580 treatment did not alter body weight, burrowing behavior, or circulating leukocytes.
- Microglia morphology was altered, but cell numbers remained unchanged.
- RNA-sequencing revealed suppressed genes related to reactive oxygen species (ROS) regulation and survival.
- GW2580 reduced microglia viability when combined with LPS (ROS inducer) and sensitized them to hydrogen peroxide-induced death.
Conclusions:
- Partial CSF1R antagonism with GW2580 alters microglia morphology and gene expression related to ROS and survival.
- GW2580 treatment alone does not reduce microglia viability but sensitizes them to oxidative and nitrosative stress.
- These findings suggest that targeting CSF1R with non-penetrant antagonists may influence microglia's response to inflammatory and oxidative conditions.
