Extremely low frequency electromagnetic field exposure does not modulate toll-like receptor signaling in human peripheral blood mononuclear cells.

Cytokine · 2011 · No effect · Low evidence

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No effectLow evidencePaper 4476

Study snapshot

PublicationCytokine · 2011

Study typein_vitro

Reported directionNo effect

Evidence ratingLow

Abstract

The effects of extremely low frequency electromagnetic fields (ELF-EMF) on human health remain unclear. It has been reported that ELF-EMF may modulate the innate immune response to microorganisms in animal models and mammalian cell-lines. With the recently gained insight in innate immune signaling and the discovery of pattern recognition, we aim to study whether ELF-EMF modulates innate inflammatory signaling pathways. We used human peripheral blood mononuclear cells (PBMCs), isolated from blood from healthy volunteers, which we stimulated with specific TLR2 and TLR4 ligands, and with several microorganisms. The cells were subsequently exposed in B(dc)=3 μT to a highly controlled and standardized ELF-EMF signal (20-5000Hz, B(ac)=5 μT, 30 min) and cytokine production was measured at different time points after stimulation. No significant difference in immune response, as reflected by IL-1β, IL-6, TNFα, IL-8 and IL-10 production, could be detected after stimulation with LPS (TLR4 ligand), Pam3Cys (TLR2 ligand) or a panel of heat killed microorganisms: Mycobacterium tuberculosis, Salmonella typhimurium, Candida albicans, Aspergillus fumigatus and Staphylococcus aureus (multiple TLR ligands). We therefore conclude that under our experimental conditions, ELF-EMF does not modulate the innate immune response of human primary cells after TLR stimulation in vitro.

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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 peripheral blood mononuclear cells (PBMCs) from healthy volunteers

Sample sizeNot supplied

ExposureELF · 30 min

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

PBMCs stimulated with TLR2/TLR4 ligands (Pam3Cys, LPS) or heat-killed microorganisms showed no significant differences in IL-1β, IL-6, TNFα, IL-8, or IL-10 production after exposure to a controlled ELF-EMF signal (20–5000 Hz; B(dc)=3 μT; B(ac)=5 μT; 30 min). The authors conclude that under these experimental conditions ELF-EMF did not modulate the innate immune response of human primary cells in vitro.

Outcomes measured

Cytokine production (IL-1β, IL-6, TNFα, IL-8, IL-10) after TLR2/TLR4 ligand or microorganism stimulation
Innate immune response / TLR signaling (inferred from stimulation paradigm)

Limitations

In vitro study in isolated PBMCs; may not reflect in vivo immune responses
Sample size and donor characteristics not reported in abstract
Single exposure condition and duration reported (20–5000 Hz; 30 min; specified flux densities)

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "30 min"
  },
  "population": "Human peripheral blood mononuclear cells (PBMCs) from healthy volunteers",
  "sample_size": null,
  "outcomes": [
    "Cytokine production (IL-1β, IL-6, TNFα, IL-8, IL-10) after TLR2/TLR4 ligand or microorganism stimulation",
    "Innate immune response / TLR signaling (inferred from stimulation paradigm)"
  ],
  "main_findings": "PBMCs stimulated with TLR2/TLR4 ligands (Pam3Cys, LPS) or heat-killed microorganisms showed no significant differences in IL-1β, IL-6, TNFα, IL-8, or IL-10 production after exposure to a controlled ELF-EMF signal (20–5000 Hz; B(dc)=3 μT; B(ac)=5 μT; 30 min). The authors conclude that under these experimental conditions ELF-EMF did not modulate the innate immune response of human primary cells in vitro.",
  "effect_direction": "no_effect",
  "limitations": [
    "In vitro study in isolated PBMCs; may not reflect in vivo immune responses",
    "Sample size and donor characteristics not reported in abstract",
    "Single exposure condition and duration reported (20–5000 Hz; 30 min; specified flux densities)"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "ELF-EMF",
    "extremely low frequency",
    "PBMC",
    "toll-like receptor",
    "TLR2",
    "TLR4",
    "innate immunity",
    "cytokines",
    "IL-1β",
    "IL-6",
    "TNFα",
    "IL-8",
    "IL-10",
    "LPS",
    "Pam3Cys",
    "microorganisms"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.2,
      "reason": "Addresses health-related biological effects of ELF-EMF exposure, relevant to general EMF health guidance discussions."
    }
  ]
}

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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: 10.1016/j.cyto.2010.12.016
PubMed: 21239179

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