Extremely Low Frequency Electromagnetic Fields Decrease Serum Levels of Interleukin-17, Transforming Growth Factor-β...

Area of Science:

• Immunology
• Environmental Health
• Electromagnetics

Background:

• Interleukin-17 (IL-17) and transforming growth factor-beta (TGF-β) are key cytokines for Th17 and regulatory T (Treg) cells.
• Retinoid-related orphan receptor γT and forkhead box P3 (Foxp3) are crucial transcription factors defining Th17 and Treg lineages, respectively.
• Extremely low frequency electromagnetic fields (ELF-EMFs) are ubiquitous, raising concerns about their biological effects.

Purpose of the Study:

• To investigate the impact of ELF-EMF exposure on IL-17 and TGF-β serum levels.
• To assess the effect of ELF-EMF exposure on the expression of Th17 (retinoid-related orphan receptor γT) and Treg (Foxp3) lineage-defining transcription factors.
• To determine dose-dependent effects of ELF-EMF exposure on these immune markers.

Main Methods:

• Eighty male rats were exposed to varying intensities of 50 Hz ELF-EMFs (1, 100, 500, 2,000 μT) or a control.
• Rats were immunized with human serum albumin after one month of exposure, with continued exposure for another month.
• Serum cytokine levels (IL-17, TGF-β) and splenic/thymic transcription factor expression (Foxp3) were measured.

Main Results:

• A significant decrease in thymus weight was observed at the highest intensity (2,000 μT).
• At lower intensities (1 and 100 μT), serum IL-17 and TGF-β levels were significantly reduced prior to immunization.
• Downregulation of Foxp3 expression was noted at 1 and 100 μT ELF-EMF exposure.

Conclusions:

• Low-intensity ELF-EMF exposure may suppress key immune responses mediated by Th17 and Treg cells.
• ELF-EMF exposure can alter cytokine profiles and transcription factor expression related to immune cell differentiation.
• Further research is warranted to understand the long-term immunological consequences of ELF-EMF exposure.