A Novel Method for Achieving Precision and Reproducibility in a 1.8 GHz Radiofrequency Exposure

Bioengineering (Basel) · 2025 · Mixed · Low evidence

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MixedLow evidencePaper 66

Study snapshot

PublicationBioengineering (Basel) · 2025

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

A Novel Method for Achieving Precision and Reproducibility in a 1.8 GHz Radiofrequency Exposure System That Modulates Intracellular ROS as a Function of Signal Amplitude in Human Cell Cultures Dahon C, Aguida B, Lebon Y, Le Guen P, Dangremont A, Meyer O, Citerne J-M, Pooam M, Raad H, Thoradit T, et al. A Novel Method for Achieving Precision and Reproducibility in a 1.8 GHz Radiofrequency Exposure System That Modulates Intracellular ROS as a Function of Signal Amplitude in Human Cell Cultures. Bioengineering. 2025; 12(3):257. doi.org. Abstract Radiofrequency fields in the 1–28 GHz range are ubiquitous in the modern world, giving rise to numerous studies of potential health risks such as cancer, neurological conditions, reproductive risks and electromagnetic hypersensitivity. However, results are inconsistent due to a lack of precision in exposure conditions and vastly differing experimental models, whereas measured RF effects are often indirect and occur over many hours or even days. Here, we present a simplified RF exposure protocol providing a single 1.8 GHz carrier frequency to human HEK293 cell monolayer cultures. A custom-built exposure box and antenna maintained in a fully shielded anechoic chamber emits discrete RF signals which can be precisely characterized and modelled. The chosen amplitudes are non-thermal and fall within the range of modern telecommunication devices. A critical feature of the protocol is that cell cultures are exposed to only a single, short (15 min) RF exposure period, followed by detection of immediate, rapid changes in gene expression. In this way, we show that modulation of genes implicated in oxidative stress and ROS signaling is among the earliest cellular responses to RF exposure. Moreover, these genes respond in complex ways to varying RF signal amplitudes consistent with a hormetic, receptor-driven biological mechanism. We conclude that induction of mild cellular stress and reactive oxygen species (ROS) is a primary response of human cells to RF signals, and that these responses occur at RF signal amplitudes within the range of normal telecommunications devices. We suggest that this method may help provide a guideline for greater reliability and reproducibility of research results between labs, thereby help resolve existing controversy on underlying mechanisms and outcomes of RF exposure in the general population. Concluding Remarks and Future Perspectives We here describe an experimental RF exposure device and protocol that present fully characterized, defined RF signals to human cells in culture. Their effects are consistent with a biological receptor-driven mechanism whereby RF exposure modulates intracellular ROS and ROS signaling pathways. This provides a testable hypothesis for the many and varied effects of RF described in the literature. These cellular responses occur at RF signal amplitudes that are orders of magnitude below those needed to achieve thermal effects, and lie within the signal range of personal electronic devices and mobile phones. Because this human cell response to RF is not linear as a function of the RF signal amplitude, the relation between RF exposure conditions and a physiological outcome is not readily deducible; indeed a robust gene expression response may occur at one amplitude but be undetected at another signal amplitude, or even undergo the opposite response entirely (e.g., opposite expression of the same gene at different signal amplitudes). It is therefore necessary to assess physiological response to RF signal exposure at multiple signal amplitudes and wavelengths, and preferably by using a readout assay that is rapid and direct. This may help explain existing confusion and contradictions in the literature, as well as stimulate future studies on the nature of the biological reception mechanisms. Finally, although RF exposure from cell phones and telecommunications devices has not been proven harmful in any way, there is a definite physiological response in human beings to this signal range. Risk factors may therefore exist for susceptibility to RF exposure, for instance in individuals with reduced tolerance to oxidative stress and/or who are exposed to excessive stressors in their daily life. These additive or synergistic effects may contribute to certain poorly defined syndromes such as electromagnetic hypersensitivity (EHS) that have been linked to RF exposure in rare individuals in the past [29]. Open access paper: mdpi.com

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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

PopulationHuman HEK293 cell monolayer cultures

Sample sizeNot supplied

ExposureRF · 1800 MHz · Single short exposure (15 min)

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

The authors describe a custom-built, shielded 1.8 GHz RF exposure system and protocol using a single 15 min exposure followed by measurement of rapid gene expression changes. They report early modulation of genes implicated in oxidative stress and ROS signaling, with complex (non-linear) responses across different non-thermal signal amplitudes within the range of modern telecommunications devices.

Outcomes measured

Gene expression changes (immediate/rapid)
Oxidative stress-related gene modulation
ROS signaling pathway modulation
Intracellular ROS / mild cellular stress response

Limitations

In vitro model (HEK293 cell cultures) may not generalize to human health outcomes
No SAR (W/kg) or quantitative dosimetry values reported in the provided abstract text
Sample size and replication details not provided in the abstract
Exposure described as non-thermal and within telecom ranges, but specific amplitude levels are not provided in the abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "RF",
    "source": null,
    "frequency_mhz": 1800,
    "sar_wkg": null,
    "duration": "Single short exposure (15 min)"
  },
  "population": "Human HEK293 cell monolayer cultures",
  "sample_size": null,
  "outcomes": [
    "Gene expression changes (immediate/rapid)",
    "Oxidative stress-related gene modulation",
    "ROS signaling pathway modulation",
    "Intracellular ROS / mild cellular stress response"
  ],
  "main_findings": "The authors describe a custom-built, shielded 1.8 GHz RF exposure system and protocol using a single 15 min exposure followed by measurement of rapid gene expression changes. They report early modulation of genes implicated in oxidative stress and ROS signaling, with complex (non-linear) responses across different non-thermal signal amplitudes within the range of modern telecommunications devices.",
  "effect_direction": "mixed",
  "limitations": [
    "In vitro model (HEK293 cell cultures) may not generalize to human health outcomes",
    "No SAR (W/kg) or quantitative dosimetry values reported in the provided abstract text",
    "Sample size and replication details not provided in the abstract",
    "Exposure described as non-thermal and within telecom ranges, but specific amplitude levels are not provided in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "1.8 GHz",
    "radiofrequency",
    "RF exposure system",
    "anechoic chamber",
    "shielded exposure",
    "non-thermal",
    "HEK293",
    "gene expression",
    "oxidative stress",
    "reactive oxygen species",
    "ROS signaling",
    "hormesis"
  ],
  "suggested_hubs": [
    {
      "slug": "mechanisms-ros-oxidative-stress",
      "weight": 0.9,
      "reason": "Reports modulation of oxidative stress/ROS signaling genes as an early cellular response to 1.8 GHz RF exposure."
    },
    {
      "slug": "exposure-assessment-dosimetry",
      "weight": 0.75,
      "reason": "Focuses on a precisely characterized, reproducible RF exposure setup and protocol."
    }
  ]
}

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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: 10.3390/bioengineering12030257
PubMed: Not supplied

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