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Updated: Jun 29, 2026
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Assessing Microglial Phagocytosis of Myelin Debris in vitro Under Repeated Magnetic Stimulation
Published on: June 17, 2025
Frequency-specific effects of pulsed magnetic field on BV2 microglial cell function
Anning Song1, Yaqing Zhao1, Shuaiju Wu1
1State Key Laboratory of Reliability and Intelligence of Electrical Equipment, School of Health Sciences and Biomedical Engineering, Hebei University of Technology, Tianjin, China.
Electromagnetic Biology and Medicine
|June 28, 2026
Summary
Pulsed magnetic field (PMF) stimulation enhanced microglial phagocytosis and migration without affecting viability. Specific frequencies (20Hz, 40Hz) reduced inflammatory markers, suggesting PMF as a potential therapeutic approach for neuroinflammation.
Area of Science:
- Neuroscience
- Biophysics
- Immunology
Background:
- Microglia play crucial roles in brain immunity and inflammation.
- Dysregulated microglial function contributes to neuroinflammatory diseases.
- Pulsed magnetic fields (PMF) offer a non-invasive method to modulate cellular functions.
Purpose of the Study:
- To investigate the impact of different PMF frequencies on microglial phagocytosis, migration, and inflammatory factor expression.
- To explore the underlying mechanisms involving NF-κB signaling and intracellular calcium.
Main Methods:
- BV2 microglia were exposed to PMF at various frequencies.
- Assessed cell viability, phagocytosis, and migration.
- Quantified mRNA and protein levels of TNF-α and IL-1β.
- Detected NF-κB p65 nuclear translocation and intracellular Ca2+ via immunofluorescence.
Main Results:
- PMF did not alter microglial viability across tested frequencies.
- All tested PMF frequencies enhanced microglial phagocytosis and migration.
- PMF at 20Hz and 40Hz decreased IL-1β and TNF-α mRNA levels.
- Only IL-1β protein levels were significantly reduced by 20Hz PMF.
- 20Hz and 40Hz PMF inhibited NF-κB p65 nuclear translocation and increased intracellular Ca2+.
Conclusions:
- Repetitive PMF stimulation modulates microglial inflammatory cytokine secretion and enhances phagocytosis/migration in a frequency-dependent manner.
- Observed variations in response may be associated with altered NF-κB activation and intracellular calcium levels.
- PMF demonstrates potential as a therapeutic tool for modulating microglial responses in neuroinflammatory conditions.
