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Proteomic Analysis of Human Macrophage Polarization Under a Low Oxygen Environment
Published on: January 7, 2019
Macrophages under low oxygen culture conditions respond to ion parametric resonance magnetic fields - biomed 2011
Spencer J Fox1, Henery O Owegi, Stephane J-P Egot-Lemaire
1Rose-Hulman Institute of Technology, Terre Haute, Indiana.
Abstract:
Macrophages, when entering inflamed tissue, encounter low oxygen tension due to the impairment of blood supply and/or the massive infiltration of cells that consume oxygen. Previously, we showed that such macrophages release more bacteriotoxic hydrogen peroxide (H2O2) when exposed in vitro to low oxygen than when cultured at usual ambient oxygen conditions. In this study, we use this low-oxygen, inflammatory macrophage model to test the macrophages response to low-frequency magnetic fields. Low-frequency fields are clinically used for bone and wound healing and are emerging as therapy for inflammatory diseases. The acceptance of these non-invasive therapies is slow due to the lack of knowledge of the cellular targets for magnetic fields. One possible target is biologically relevant ions. The Ion Parametric Resonance (IPR) concept predicts that specific externally applied AC and DC magnetic fields will resonate with the cyclotron motion of ions. This concept is supported by experimental evidence, especially on a neuronal cell line. Using our macrophage model, we tested AC and DC magnetic fields at the amplitude ratio and frequency predicted by the IPR model for resonance with hydrogen, magnesium and manganese ions. Under these conditions, we found a significant increase in H2O2 release compared to control cells. Magnetic field exposure conditions in which parameters differed from the predictions of the IPR model showed no, or a smaller difference, with respect to the control cultures. These data indicate that magnetic fields can enhance H2O2 release of inflammatory macrophages, which is consistent with the predictions of the IPR model.
Insights
Low-frequency magnetic fields significantly increase hydrogen peroxide (H2O2) release from inflammatory macrophages. This effect aligns with the Ion Parametric Resonance (IPR) model, suggesting a potential therapeutic mechanism for inflammatory diseases.
Area of Science:
- Immunology
- Biophysics
- Cell Biology
Background:
- Inflammation leads to low oxygen conditions in tissues, affecting macrophage function.
- Macrophages in low oxygen environments release more bacteriotoxic hydrogen peroxide (H2O2).
- Low-frequency magnetic fields are explored for treating inflammatory diseases, but cellular targets remain unclear.
Purpose of the Study:
- To investigate the effect of low-frequency magnetic fields on macrophages in a low-oxygen, inflammatory model.
- To test the Ion Parametric Resonance (IPR) concept as a mechanism for magnetic field interaction with macrophages.
- To determine if specific magnetic field parameters enhance H2O2 release from macrophages.
Main Methods:
- Utilized a macrophage model simulating low-oxygen, inflammatory conditions.
- Applied specific alternating current (AC) and direct current (DC) magnetic fields predicted by the IPR model.
- Measured H2O2 release from macrophages under varying magnetic field conditions.
Main Results:
- Magnetic field exposure, consistent with IPR predictions for hydrogen, magnesium, and manganese ions, significantly increased H2O2 release.
- Deviations from IPR-predicted magnetic field parameters resulted in no or diminished increases in H2O2 release.
- Demonstrated a correlation between IPR-specific magnetic fields and enhanced macrophage H2O2 production.
Conclusions:
- Low-frequency magnetic fields can enhance H2O2 release from inflammatory macrophages.
- The findings support the Ion Parametric Resonance (IPR) model as a potential explanation for magnetic field effects on macrophages.
- This research suggests a cellular mechanism for the therapeutic application of magnetic fields in inflammatory conditions.
