Assessment of the neurotoxic potential of exposure to 50Hz extremely low frequency electromagnetic fields (ELF-EMF) in naïve and chemically stressed PC12 cells

Neurotoxicology · 2014 · No effect · Low evidence

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No effectLow evidencePaper 2746

Study snapshot

PublicationNeurotoxicology · 2014

Study typein_vitro

Reported directionNo effect

Evidence ratingLow

Abstract

Increasing exposure to extremely low frequency electromagnetic fields (ELF-EMF), generated by power lines and electric appliances, raises concern about potential adverse health effects of ELF-EMF. The central nervous system is expected to be particularly vulnerable to ELF-EMF as its function strongly depends on electrical excitability. We therefore investigated effects of acute (30min) and sub-chronic (48h) exposure to 50Hz ELF-EMF on naïve and chemically stressed pheochromocytoma (PC12) cells. The latter have higher levels of iron and/or reactive oxygen species (ROS) and display increased vulnerability to environmental insults. Effects of ELF-EMF on Ca(2+)-homeostasis, ROS production and membrane integrity were assessed using Fura-2 single cell fluorescence microscopy, H2-DCFDA and CFDA assays, respectively. Our data demonstrate that acute exposure of naïve PC12 cells to 50Hz ELF-EMF up to 1000μT fails to affect basal or depolarization-evoked [Ca(2+)]i. Moreover, sub-chronic ELF-EMF exposure up to 1000μT has no consistent effects on Ca(2+)-homeostasis in naïve PC12 cells and does not affect ROS production and membrane integrity. Notably, in chemically stressed PC12 cells both acute and sub-chronic ELF-EMF exposure also failed to exert consistent effects on Ca(2+)-homeostasis, ROS production and membrane integrity. Our combined findings thus indicate that exposure to 50Hz ELF-EMF up to 1000μT, i.e. 10,000 times above background exposure, does not induce neurotoxic effects in vitro, neither in naïve nor in chemically stressed PC12 cells. Though our data require confirmation, e.g. in developing neuronal cells in vitro or (developing) animals, it appears that the neurotoxic risk of ELF-EMF exposure is limited.

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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

PopulationPC12 (pheochromocytoma) cells; naïve and chemically stressed (higher iron and/or ROS)

Sample sizeNot supplied

ExposureELF · acute (30 min) and sub-chronic (48 h)

Evidence strengthLowConfidence: 86% · Peer reviewed: yes

Main findings

Acute (30 min) and sub-chronic (48 h) exposure to 50 Hz ELF-EMF up to 1000 μT did not produce consistent effects on Ca(2+) homeostasis in naïve PC12 cells and did not affect ROS production or membrane integrity. In chemically stressed PC12 cells, both acute and sub-chronic exposures also failed to exert consistent effects on Ca(2+) homeostasis, ROS production, or membrane integrity.

Outcomes measured

Ca(2+) homeostasis (basal and depolarization-evoked [Ca(2+)]i)
ROS production
Membrane integrity

Limitations

In vitro model (PC12 cells) may not generalize to developing neuronal cells or animals
Authors note findings require confirmation in other models (e.g., developing neuronal cells in vitro or (developing) animals)
Exposure metrics beyond field strength (e.g., detailed dosimetry) not described in abstract
Sample size and replication details not reported in abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": "power lines and electric appliances",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "acute (30 min) and sub-chronic (48 h)"
  },
  "population": "PC12 (pheochromocytoma) cells; naïve and chemically stressed (higher iron and/or ROS)",
  "sample_size": null,
  "outcomes": [
    "Ca(2+) homeostasis (basal and depolarization-evoked [Ca(2+)]i)",
    "ROS production",
    "Membrane integrity"
  ],
  "main_findings": "Acute (30 min) and sub-chronic (48 h) exposure to 50 Hz ELF-EMF up to 1000 μT did not produce consistent effects on Ca(2+) homeostasis in naïve PC12 cells and did not affect ROS production or membrane integrity. In chemically stressed PC12 cells, both acute and sub-chronic exposures also failed to exert consistent effects on Ca(2+) homeostasis, ROS production, or membrane integrity.",
  "effect_direction": "no_effect",
  "limitations": [
    "In vitro model (PC12 cells) may not generalize to developing neuronal cells or animals",
    "Authors note findings require confirmation in other models (e.g., developing neuronal cells in vitro or (developing) animals)",
    "Exposure metrics beyond field strength (e.g., detailed dosimetry) not described in abstract",
    "Sample size and replication details not reported in abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.86,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "ELF-EMF",
    "50 Hz",
    "PC12 cells",
    "neurotoxicity",
    "calcium homeostasis",
    "reactive oxygen species",
    "membrane integrity",
    "chemical stress",
    "iron",
    "1000 μT"
  ],
  "suggested_hubs": [
    {
      "slug": "occupational-exposure",
      "weight": 0.2,
      "reason": "Discusses ELF-EMF from power lines/electric appliances; potential relevance to higher-exposure contexts, though study is in vitro."
    }
  ]
}

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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.neuro.2014.07.009
PubMed: 25111744

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