RF Safe

ROS release and Hsp70 expression after exposure to 1,800 MHz radiofrequency electromagnetic fields in primary human monocytes and lymphocytes.

Radiation and environmental biophysics · 2006 · No effect · Low evidence

← Research stream
No effectLow evidencePaper 5136

PMA (positive control) significantly increased ROS in monocytes and lymphocytes versus sham/incubator controls. After GSM-DTX exposure at 2 W/kg, monocytes showed a statistically significant difference versus sham, but the authors attribute this to lowered RO…

Study snapshot

PublicationRadiation and environmental biophysics · 2006
Study typeother
Reported directionNo effect
Evidence ratingLow

Abstract

The aim of this study is to investigate if 1,800 MHz radiofrequency electromagnetic fields (RF-EMF) can induce reactive oxygen species (ROS) release and/or changes in heat shock protein 70 (Hsp70) expression in human blood cells, using different exposure and co-exposure conditions. Human umbilical cord blood-derived monocytes and lymphocytes were used to examine ROS release after exposure to continuous wave or different GSM signals (GSM-DTX and GSM-Talk) at 2 W/kg for 30 or 45 min of continuous or intermittent (5 min ON/5 min OFF) exposure. The cells were exposed to incubator conditions, to sham, to RF-EMF, or to chemicals in parallel. Cell stimulation with the phorbol ester phorbol-12-myristate-13-acetate (PMA; 1 microM) was used as positive control for ROS release. To investigate the effects on Hsp70 expression, the human monocytes were exposed to the GSM-DTX signal at 2 W/kg for 45 min, or to heat treatment (42 degrees C) as positive control. ROS production and Hsp70 expression were determined by flow cytometric analysis. The data were compared to sham and/or to control values and the statistical analysis was performed by the Student's t-test (P<0.05). The PMA treatment induced a significant increase in ROS production in human monocytes and lymphocytes when the data were compared to sham or to incubator controls. After continuous or intermittent GSM-DTX signal exposure (2 W/kg), a significantly different ROS production was detected in human monocytes if the data were compared to sham. However, this significant difference appeared due to the lowered value of ROS release during sham exposure. In human lymphocytes, no differences could be detected if data were compared either to sham or to incubator control. The Hsp70 expression level after 0, 1, and 2 h post-exposure to GSM-DTX signal at 2 W/kg for 1 h did not show any differences compared to the incubator or to sham control.

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 typeother
Effect directionno_effect
PopulationPrimary human umbilical cord blood-derived monocytes and lymphocytes
Sample sizeNot supplied
ExposureRF · 1800 MHz · 2 W/kg · 30 or 45 min (continuous or intermittent 5 min ON/5 min OFF); Hsp70 arm: GSM-DTX exposure (reported as 45 min and also 1 h) with assessment at 0, 1, 2 h post-exposure
Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

PMA (positive control) significantly increased ROS in monocytes and lymphocytes versus sham/incubator controls. After GSM-DTX exposure at 2 W/kg, monocytes showed a statistically significant difference versus sham, but the authors attribute this to lowered ROS during sham exposure; lymphocytes showed no differences versus sham or incubator control. Hsp70 expression in monocytes showed no differences versus incubator or sham controls at 0, 1, or 2 h post-exposure.

Outcomes measured

  • Reactive oxygen species (ROS) release/production
  • Heat shock protein 70 (Hsp70) expression

Limitations

  • Sample size not reported in abstract
  • Significant ROS difference in monocytes versus sham may be driven by unusually low sham values (as noted by authors)
  • Exposure duration for Hsp70 arm is inconsistently reported (45 min vs 1 h) in the abstract
  • Statistical approach described only as Student's t-test; limited detail on multiple comparisons or variability
View raw extracted JSON
{
  "study_type": "other",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 1800,
    "sar_wkg": 2,
    "duration": "30 or 45 min (continuous or intermittent 5 min ON/5 min OFF); Hsp70 arm: GSM-DTX exposure (reported as 45 min and also 1 h) with assessment at 0, 1, 2 h post-exposure"
  },
  "population": "Primary human umbilical cord blood-derived monocytes and lymphocytes",
  "sample_size": null,
  "outcomes": [
    "Reactive oxygen species (ROS) release/production",
    "Heat shock protein 70 (Hsp70) expression"
  ],
  "main_findings": "PMA (positive control) significantly increased ROS in monocytes and lymphocytes versus sham/incubator controls. After GSM-DTX exposure at 2 W/kg, monocytes showed a statistically significant difference versus sham, but the authors attribute this to lowered ROS during sham exposure; lymphocytes showed no differences versus sham or incubator control. Hsp70 expression in monocytes showed no differences versus incubator or sham controls at 0, 1, or 2 h post-exposure.",
  "effect_direction": "no_effect",
  "limitations": [
    "Sample size not reported in abstract",
    "Significant ROS difference in monocytes versus sham may be driven by unusually low sham values (as noted by authors)",
    "Exposure duration for Hsp70 arm is inconsistently reported (45 min vs 1 h) in the abstract",
    "Statistical approach described only as Student's t-test; limited detail on multiple comparisons or variability"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "1800 MHz",
    "RF-EMF",
    "GSM",
    "GSM-DTX",
    "GSM-Talk",
    "continuous wave",
    "intermittent exposure",
    "SAR 2 W/kg",
    "human monocytes",
    "human lymphocytes",
    "umbilical cord blood",
    "ROS",
    "oxidative stress",
    "Hsp70",
    "heat shock protein 70",
    "flow cytometry"
  ],
  "suggested_hubs": []
}
AI can be wrong. Always verify against the paper.

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: 10.1007/s00411-006-0038-3
PubMed: 16552570

Read the original paper →

Related papers

← Back to the Research Library