Neurotoxic effects of 3.5 GHz GSM-like RF exposure on cultured DRG neurons: a mechanistic insight into oxidative and apoptotic pathways.

Abstract

PURPOSE: This study investigated whether strictly non-thermal, GSM-like 3.5 GHz radiofrequency electromagnetic fields (RF-EMF)-overlapping in frequency with bands used by 5 G networks but not employing a 5 G NR waveform-disrupt redox homeostasis and activate apoptotic signaling in peripheral sensory neurons. MATERIALS AND METHODS: Primary mouse dorsal root ganglion (DRG) cultures were exposed in a GTEM-based setup to pulsed 3.5 GHz RF-EMF (217 Hz, ∼12.5% duty) for 1-24 h at 37 °C with <0.1 °C temperature difference between groups. Dosimetry confirmed non-thermal exposure with localized peaks consistent with IEEE/IEC guidance. Cell viability, reactive oxygen species (ROS), mitochondrial-apoptotic markers (Bax, Bcl-2, cytochrome c, caspase-3), and p75^NTR were quantified by blinded confocal analysis. RESULTS: RF-EMF caused a significant, time-dependent reduction in viability with robust ROS elevations; increased Bax and caspase-3; decreased Bcl-2; and cytochrome c release, with maximal effects at 12-24 h. p75^NTR upregulation indicated maladaptive neurotrophin signaling. CONCLUSIONS: Under non-thermal conditions, 3.5 GHz RF-EMF perturbs redox balance and triggers mitochondria-dependent apoptosis in DRG neurons, highlighting peripheral neuronal vulnerability to mid-band exposures. These findings provide a mechanistic link between RF exposure and oxidative/apoptotic pathways and warrant in vivo studies assessing long-term and interventional outcomes.

AI evidence extraction

Main findings

In primary mouse DRG cultures, pulsed 3.5 GHz GSM-like RF-EMF exposure under non-thermal conditions was associated with a significant time-dependent reduction in cell viability and increased ROS. The study reports increased Bax and caspase-3, decreased Bcl-2, cytochrome c release, and upregulation of p75^NTR, with maximal effects at 12–24 h.

Outcomes measured

• Cell viability
• Reactive oxygen species (ROS)
• Bax
• Bcl-2
• Cytochrome c release
• Caspase-3
• p75^NTR expression

Limitations

• In vitro model (primary mouse DRG cultures) may not generalize to in vivo or human outcomes
• No sample size reported in abstract
• Specific exposure waveform described as GSM-like and not 5G NR; relevance to real-world 5G exposures may be limited
• Exposure duration limited to acute (up to 24 h); long-term effects not assessed

Suggested hubs

• 5g-policy (0.4)
  Exposure frequency overlaps mid-band used by 5G networks (3.5 GHz), though waveform is not 5G NR.

{
    "study_type": "in_vitro",
    "exposure": {
        "band": "RF",
        "source": null,
        "frequency_mhz": 3500,
        "sar_wkg": null,
        "duration": "1–24 h"
    },
    "population": "Primary mouse dorsal root ganglion (DRG) neuron cultures",
    "sample_size": null,
    "outcomes": [
        "Cell viability",
        "Reactive oxygen species (ROS)",
        "Bax",
        "Bcl-2",
        "Cytochrome c release",
        "Caspase-3",
        "p75^NTR expression"
    ],
    "main_findings": "In primary mouse DRG cultures, pulsed 3.5 GHz GSM-like RF-EMF exposure under non-thermal conditions was associated with a significant time-dependent reduction in cell viability and increased ROS. The study reports increased Bax and caspase-3, decreased Bcl-2, cytochrome c release, and upregulation of p75^NTR, with maximal effects at 12–24 h.",
    "effect_direction": "harm",
    "limitations": [
        "In vitro model (primary mouse DRG cultures) may not generalize to in vivo or human outcomes",
        "No sample size reported in abstract",
        "Specific exposure waveform described as GSM-like and not 5G NR; relevance to real-world 5G exposures may be limited",
        "Exposure duration limited to acute (up to 24 h); long-term effects not assessed"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "3.5 GHz",
        "RF-EMF",
        "GSM-like",
        "non-thermal",
        "DRG neurons",
        "mouse",
        "oxidative stress",
        "ROS",
        "apoptosis",
        "mitochondrial pathway",
        "Bax",
        "Bcl-2",
        "cytochrome c",
        "caspase-3",
        "p75NTR",
        "GTEM"
    ],
    "suggested_hubs": [
        {
            "slug": "5g-policy",
            "weight": 0.40000000000000002220446049250313080847263336181640625,
            "reason": "Exposure frequency overlaps mid-band used by 5G networks (3.5 GHz), though waveform is not 5G NR."
        }
    ]
}

Comments

Log in to comment.

No comments yet.