Effects of 50 Hz magnetic field exposure on the rate of RNA synthesis by normal human fibroblasts.

International journal of radiation biology · 1999 · No effect · Low evidence

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No effectLow evidencePaper 4036

Across a 5 h period, [3H]uridine incorporation into total RNA and mRNA increased over time in all cells, but 50 Hz magnetic field exposure (2 microT to 20 mT) had no detectable effect on the synthesis rate of total or messenger RNA compared with controls.

Study snapshot

PublicationInternational journal of radiation biology · 1999

Study typein_vitro

Reported directionNo effect

Evidence ratingLow

Abstract

PURPOSE: To investigate whether exposure to magnetic fields can affect the rate of RNA synthesis, a broad measure of cellular activity. MATERIALS AND METHODS: Normal human fibroblasts were exposed to 50 Hz magnetic fields at a range of flux densities between 2 microT and 20 mT. The rate of synthesis of total RNA was determined by following the incorporation of [3H]uridine into macromolecular material. In addition, polyadenylated RNA was isolated and used to estimate the rate of synthesis of mRNA. RESULTS: Incorporation of [3H]uridine into both total and messenger RNA increased progressively throughout the 5 h exposure period in all cells. However, magnetic field exposure had no detectable effect on the rate of synthesis of either total or messenger RNA when compared with controls. CONCLUSIONS: These findings indicate that under the conditions examined, gross transcription rates are not affected by exposure to power frequency magnetic fields. Taken together with previous data, this suggests that if magnetic fields do alter cellular activity, the effect is likely to be extremely subtle.

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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

PopulationNormal human fibroblasts (cell culture)

Sample sizeNot supplied

ExposureELF · 0.05 MHz · 5 h

Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

Outcomes measured

Rate of total RNA synthesis ([3H]uridine incorporation)
Rate of mRNA synthesis (polyadenylated RNA)

Limitations

Sample size not reported in abstract
Only gross transcription rates assessed (total RNA and mRNA synthesis)
Exposure duration limited to 5 h
In vitro model (normal human fibroblasts) may not generalize to in vivo effects

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "ELF",
    "source": null,
    "frequency_mhz": 0.05,
    "sar_wkg": null,
    "duration": "5 h"
  },
  "population": "Normal human fibroblasts (cell culture)",
  "sample_size": null,
  "outcomes": [
    "Rate of total RNA synthesis ([3H]uridine incorporation)",
    "Rate of mRNA synthesis (polyadenylated RNA)"
  ],
  "main_findings": "Across a 5 h period, [3H]uridine incorporation into total RNA and mRNA increased over time in all cells, but 50 Hz magnetic field exposure (2 microT to 20 mT) had no detectable effect on the synthesis rate of total or messenger RNA compared with controls.",
  "effect_direction": "no_effect",
  "limitations": [
    "Sample size not reported in abstract",
    "Only gross transcription rates assessed (total RNA and mRNA synthesis)",
    "Exposure duration limited to 5 h",
    "In vitro model (normal human fibroblasts) may not generalize to in vivo effects"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "50 Hz",
    "extremely low frequency",
    "magnetic field",
    "human fibroblasts",
    "RNA synthesis",
    "mRNA",
    "transcription",
    "[3H]uridine",
    "in vitro"
  ],
  "suggested_hubs": [
    {
      "slug": "el f-power-frequency",
      "weight": 0.86,
      "reason": "Study examines 50 Hz (power-frequency) magnetic field exposure effects 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: 10.1080/095530099140294
PubMed: 10374947

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