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Low-frequency electromagnetic fields do not alter responses of inflammatory genes and proteins in human monocytes and immune cell lines.

Bioelectromagnetics · 2012 · No effect · Low evidence

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No effectLow evidencePaper 3219

Exposure of immune cells to a complex multiple waveform field or a 50 Hz sine wave did not result in significant effects on inflammation-related gene expression or cytokine protein levels in the studied cells. Additional experiments in non-immune cells also s…

Study snapshot

PublicationBioelectromagnetics · 2012
Study typein_vitro
Reported directionNo effect
Evidence ratingLow

Abstract

The effects of low frequency electromagnetic fields (LF EMF) on human health are the subject of on-going research and serious public concern. These fields potentially elicit small effects that have been proposed to have consequences, either positive or negative, for biological systems. To reveal potentially weak but biologically relevant effects, we chose to extensively examine exposure of immune cells to two different signals, namely a complex multiple waveform field, and a 50 Hz sine wave. These immune cells are highly responsive and, in vivo, modulation of cytokine expression responses can result in systemic health effects. Using time course experiments, we determined kinetics of cytokine and other inflammation-related genes in a human monocytic leukemia cell line, THP-1, and primary monocytes and macrophages. Moreover, cytokine protein levels in THP-1 monocytes were determined. Exposure to either of the two signals did not result in a significant effect on gene and protein expression in the studied immune cells. Also, additional experiments using non-immune cells showed no effects of the signals on cytokine gene expression. We therefore conclude that these LF EMF exposure conditions are not expected to significantly modulate innate immune signaling.

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 directionno_effect
PopulationHuman monocytic leukemia cell line (THP-1), primary human monocytes and macrophages; additional non-immune cells (not specified).
Sample sizeNot supplied
ExposureELF
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Exposure of immune cells to a complex multiple waveform field or a 50 Hz sine wave did not result in significant effects on inflammation-related gene expression or cytokine protein levels in the studied cells. Additional experiments in non-immune cells also showed no effects on cytokine gene expression.

Outcomes measured

  • Cytokine and other inflammation-related gene expression (time course)
  • Cytokine protein levels in THP-1 monocytes
  • Cytokine gene expression in non-immune cells (additional experiments)

Limitations

  • Exposure parameters (field strength, duration) not provided in the abstract
  • Sample sizes and statistical details not reported in the abstract
  • Non-immune cell types not specified in the abstract
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": "Human monocytic leukemia cell line (THP-1), primary human monocytes and macrophages; additional non-immune cells (not specified).",
  "sample_size": null,
  "outcomes": [
    "Cytokine and other inflammation-related gene expression (time course)",
    "Cytokine protein levels in THP-1 monocytes",
    "Cytokine gene expression in non-immune cells (additional experiments)"
  ],
  "main_findings": "Exposure of immune cells to a complex multiple waveform field or a 50 Hz sine wave did not result in significant effects on inflammation-related gene expression or cytokine protein levels in the studied cells. Additional experiments in non-immune cells also showed no effects on cytokine gene expression.",
  "effect_direction": "no_effect",
  "limitations": [
    "Exposure parameters (field strength, duration) not provided in the abstract",
    "Sample sizes and statistical details not reported in the abstract",
    "Non-immune cell types not specified in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "low frequency electromagnetic fields",
    "ELF EMF",
    "50 Hz",
    "multiple waveform field",
    "THP-1",
    "primary monocytes",
    "macrophages",
    "cytokines",
    "inflammation",
    "gene expression",
    "protein expression",
    "innate immune signaling"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.25,
      "reason": "Study examines 50 Hz/low-frequency EMF, which can be relevant to power-frequency exposure contexts, though no specific occupational setting is described."
    }
  ]
}
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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: 10.1002/bem.20695
PubMed: 22389196

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