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Expression of HSP72 after ELF-EMF exposure in three cell lines.

Bioelectromagnetics · 2007 · Mixed · Low evidence

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MixedLow evidencePaper 5065

Across exposure schemes (2 µT to 4 mT, 50 Hz, 15–30 min), no significant effects were observed on HSP72 protein levels in HL-60 or Girardi heart cells. HSP72 mRNA transcription could be induced to some extent with one parameter combination in all three tested…

Study snapshot

PublicationBioelectromagnetics · 2007
Study typein_vitro
Reported directionMixed
Evidence ratingLow

Abstract

It has been reported that magnetic fields with flux densities ranging from microT to mT are able to induce heat shock factor, HSP72 mRNA or heat shock proteins in various cells. In this study we investigated changes in the HSP72 mRNA transcription level in three cell lines (HL-60, H9c2, and Girardi heart cells) and in the intracellular HSP72 protein content in two cell lines (HL-60 and Girardi heart cells) after treatment schemes using electromagnetic fields with a flux density of 2 microT to 4 mT, a frequency of 50 Hz and exposure times from 15 to 30 min. None of the treatments or modalities showed any significant effect on the HSP72 protein level, although HSP72 mRNA could be induced, at least to some extent, with one of the parameter combinations in all cell lines tested. Obviously, HSP72 mRNA transcription and translation are not necessarily coupled in certain cells. This leads to the conclusion that electromagnetic field effects on HSP72 mRNA levels are not indicative for downstream effects unless increased mRNA levels can be correlated with increased HSP72 protein levels as well.

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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 directionmixed
PopulationNot supplied
Sample sizeNot supplied
ExposureELF · 0.05 MHz · 15–30 min
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Across exposure schemes (2 µT to 4 mT, 50 Hz, 15–30 min), no significant effects were observed on HSP72 protein levels in HL-60 or Girardi heart cells. HSP72 mRNA transcription could be induced to some extent with one parameter combination in all three tested cell lines (HL-60, H9c2, Girardi heart cells).

Outcomes measured

  • HSP72 mRNA transcription level
  • Intracellular HSP72 protein content

Limitations

  • In vitro cell-line study; findings may not generalize beyond the tested cell lines and conditions.
  • HSP72 protein content was assessed only in two of the three cell lines.
  • mRNA induction was reported only 'to some extent' and tied to one parameter combination; details of that combination are not provided in the abstract.
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 0.05,
    "sar_wkg": null,
    "duration": "15–30 min"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "HSP72 mRNA transcription level",
    "Intracellular HSP72 protein content"
  ],
  "main_findings": "Across exposure schemes (2 µT to 4 mT, 50 Hz, 15–30 min), no significant effects were observed on HSP72 protein levels in HL-60 or Girardi heart cells. HSP72 mRNA transcription could be induced to some extent with one parameter combination in all three tested cell lines (HL-60, H9c2, Girardi heart cells).",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro cell-line study; findings may not generalize beyond the tested cell lines and conditions.",
    "HSP72 protein content was assessed only in two of the three cell lines.",
    "mRNA induction was reported only 'to some extent' and tied to one parameter combination; details of that combination are not provided in the abstract."
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "ELF-EMF",
    "50 Hz",
    "magnetic field",
    "2 µT",
    "4 mT",
    "HSP72",
    "heat shock protein",
    "mRNA transcription",
    "protein expression",
    "HL-60",
    "H9c2",
    "Girardi heart cells"
  ],
  "suggested_hubs": []
}
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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.20327
PubMed: 17508393

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