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Free radical release and HSP70 expression in two human immune-relevant cell lines after exposure to 1800 MHz radiofrequency radiation.

Radiation research · 2006 · No effect · Low evidence

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No effectLow evidencePaper 5146

In Mono Mac 6 cells, heat (40°C) and PMA significantly increased superoxide radical anions and ROS compared with sham/incubator controls. Across multiple 1800 MHz RF EMF signals (continuous-wave and GSM modulations) at SAR 0.5–2.0 W/kg, no significant differe…

Study snapshot

PublicationRadiation research · 2006
Study typein_vitro
Reported directionNo effect
Evidence ratingLow

Abstract

The goal of this study was to investigate whether radiofrequency (RF) electromagnetic-field (EMF) exposure at 1800 MHz causes production of free radicals and/or expression of heat-shock proteins (HSP70) in human immune-relevant cell systems. Human Mono Mac 6 and K562 cells were used to examine free radical release after exposure to incubator control, sham, RF EMFs, PMA, LPS, heat (40 degrees C) or co-exposure conditions. Several signals were used: continuous-wave, several typical modulations of the Global System for Mobile Communications (GSM): GSM-non DTX (speaking only), GSM-DTX (hearing only), GSM-Talk (34% speaking and 66% hearing) at specific absorption rates (SARs) of 0.5, 1.0, 1.5 and 2.0 W/kg. Heat and PMA treatment induced a significant increase in superoxide radical anions and in ROS production in the Mono Mac 6 cells when compared to sham and/or incubator conditions. No significant differences in free radical production were detected after RF EMF exposure or in the respective controls, and no additional effects on superoxide radical anion production were detected after co-exposure to RF EMFs+PMA or RF EMFs+LPS. The GSM-DTX signal at 2 W/kg produced a significant difference in free radical production when the data were compared to sham because of the decreasing sham value. This difference disappeared when data were compared to the incubator controls. To determine the involvement of heat-shock proteins as a possible inhibitor of free radical production, we investigated the HSP70 expression level after different RF EMF exposures; no significant effects were detected.

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 cell lines (Mono Mac 6 and K562; immune-relevant)
Sample sizeNot supplied
ExposureRF · 1800 MHz · 2 W/kg
Evidence strengthLowConfidence: 78% · Peer reviewed: yes

Main findings

In Mono Mac 6 cells, heat (40°C) and PMA significantly increased superoxide radical anions and ROS compared with sham/incubator controls. Across multiple 1800 MHz RF EMF signals (continuous-wave and GSM modulations) at SAR 0.5–2.0 W/kg, no significant differences in free radical production were detected versus controls, and no additional effects were seen with co-exposures (RF+PMA or RF+LPS). HSP70 expression showed no significant changes after RF EMF exposure.

Outcomes measured

  • Free radical production (superoxide radical anions, ROS)
  • HSP70 expression

Limitations

  • Sample size not reported in abstract
  • In vitro cell-line model; generalizability to humans not addressed in abstract
  • One reported significant difference (GSM-DTX at 2 W/kg vs sham) was attributed to a decreasing sham value and disappeared vs incubator controls
View raw extracted JSON
{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": "GSM/mobile phone-like signal",
    "frequency_mhz": 1800,
    "sar_wkg": 2,
    "duration": null
  },
  "population": "Human cell lines (Mono Mac 6 and K562; immune-relevant)",
  "sample_size": null,
  "outcomes": [
    "Free radical production (superoxide radical anions, ROS)",
    "HSP70 expression"
  ],
  "main_findings": "In Mono Mac 6 cells, heat (40°C) and PMA significantly increased superoxide radical anions and ROS compared with sham/incubator controls. Across multiple 1800 MHz RF EMF signals (continuous-wave and GSM modulations) at SAR 0.5–2.0 W/kg, no significant differences in free radical production were detected versus controls, and no additional effects were seen with co-exposures (RF+PMA or RF+LPS). HSP70 expression showed no significant changes after RF EMF exposure.",
  "effect_direction": "no_effect",
  "limitations": [
    "Sample size not reported in abstract",
    "In vitro cell-line model; generalizability to humans not addressed in abstract",
    "One reported significant difference (GSM-DTX at 2 W/kg vs sham) was attributed to a decreasing sham value and disappeared vs incubator controls"
  ],
  "evidence_strength": "low",
  "confidence": 0.78,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "1800 MHz",
    "radiofrequency",
    "RF EMF",
    "GSM",
    "specific absorption rate",
    "SAR",
    "free radicals",
    "reactive oxygen species",
    "ROS",
    "superoxide",
    "HSP70",
    "Mono Mac 6",
    "K562",
    "PMA",
    "LPS",
    "sham exposure",
    "incubator control"
  ],
  "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: 10.1667/rr3476.1
PubMed: 16392966

Read the original paper →

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