RF Safe

Effects of exposure to extremely low-frequency electromagnetic fields on the differentiation of Th17 T cells and regulatory T cells.

General physiology and biophysics · 2016 · Mixed · Low evidence

← Research stream
MixedLow evidencePaper 4816

In CD4+ T cells exposed to 60 Hz 0.3 mT EMF, IFN-γ and IL-2 production and cell proliferation were not altered. Th17-associated gene expression and IL-17A effector cytokine production increased, along with increased SMAD3 phosphorylation; Treg differentiation…

Study snapshot

PublicationGeneral physiology and biophysics · 2016
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

The potential risks that electromagnetic fields (EMF) pose to human physiology have been debated for several decades, especially considering that EMF is almost omnipresent and some occupations involve regular exposure to particularly strong fields. In the present study, the effects of 60 Hz 0.3 mT EMF on CD4+ T cells were evaluated. Production of T cell related cytokines, IFN-γ and IL-2, was not altered in CD4+ T cells that were exposed to EMF, and cell proliferation was also unaffected. The expression of genes present in a subset of Th17 cells was upregulated following EMF exposure, and the production of effector cytokines of the IL-17A subset also increased. To determine signaling pathways that underlie these effects, phosphorylation of STAT3 and SMAD3, downstream molecules of cytokines critical for Th17 induction, was analyzed. Increased SMAD3 phosphorylation level in cells exposed to EMF, suggesting that SMAD3 may be at least in part causing the increased Th17 cell production. Differentiation of Treg, another CD4+ T cell subset induced by SMAD3 signaling, was also elevated following EMF exposure. These results suggest that 60 Hz 0.3 mT EMF exposure amplifies TGF-β signaling and increases the generation of specific T cell subsets.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typein_vitro
Effect directionmixed
PopulationCD4+ T cells
Sample sizeNot supplied
ExposureELF · 6e-05 MHz
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In CD4+ T cells exposed to 60 Hz 0.3 mT EMF, IFN-γ and IL-2 production and cell proliferation were not altered. Th17-associated gene expression and IL-17A effector cytokine production increased, along with increased SMAD3 phosphorylation; Treg differentiation was also elevated following EMF exposure.

Outcomes measured

  • CD4+ T cell cytokine production (IFN-γ, IL-2)
  • CD4+ T cell proliferation
  • Th17-related gene expression
  • IL-17A effector cytokine production
  • STAT3 phosphorylation
  • SMAD3 phosphorylation
  • Regulatory T cell (Treg) differentiation
  • Th17 differentiation

Limitations

  • Exposure duration not reported in abstract
  • Sample size not reported in abstract
  • In vitro study; generalizability to humans not addressed in abstract
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 6e-05,
    "sar_wkg": null,
    "duration": null
  },
  "population": "CD4+ T cells",
  "sample_size": null,
  "outcomes": [
    "CD4+ T cell cytokine production (IFN-γ, IL-2)",
    "CD4+ T cell proliferation",
    "Th17-related gene expression",
    "IL-17A effector cytokine production",
    "STAT3 phosphorylation",
    "SMAD3 phosphorylation",
    "Regulatory T cell (Treg) differentiation",
    "Th17 differentiation"
  ],
  "main_findings": "In CD4+ T cells exposed to 60 Hz 0.3 mT EMF, IFN-γ and IL-2 production and cell proliferation were not altered. Th17-associated gene expression and IL-17A effector cytokine production increased, along with increased SMAD3 phosphorylation; Treg differentiation was also elevated following EMF exposure.",
  "effect_direction": "mixed",
  "limitations": [
    "Exposure duration not reported in abstract",
    "Sample size not reported in abstract",
    "In vitro study; generalizability to humans not addressed in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "extremely low-frequency electromagnetic fields",
    "ELF-EMF",
    "60 Hz",
    "0.3 mT",
    "CD4+ T cells",
    "Th17",
    "Treg",
    "IL-17A",
    "IFN-γ",
    "IL-2",
    "STAT3",
    "SMAD3",
    "TGF-β signaling"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.25,
      "reason": "Abstract notes some occupations involve regular exposure to strong fields, though the study itself is in vitro."
    }
  ]
}
AI can be wrong. Always verify against the paper.

AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.4149/gpb_2016011
PubMed: 27527723

Read the original paper →

Related papers

← Back to the Research Library