Genotoxic Effects in Human Fibroblasts Exposed to Microwave Radiation.

Abstract

In the last decades, technological development has led to an increasing use of devices and systems based on microwave radiation. The increased employment of these devices has elicited questions about the potential long-term health consequences associated with microwave radiation exposure. From this perspective, biological effects of microwave radiation have been the focus of many studies, but the reported scientific data are unclear and contradictory. The aim of this study is to evaluate the potential genotoxic and cellular effects associated with in vitro exposure of human fetal and adult fibroblasts to microwave radiation at the frequency of 25 GHz. For this purpose, several genetic and biological end points were evaluated. Results obtained from comet assay, phosphorylation of H2AX histone, and antikinetochore antibody (CREST)-negative micronuclei frequency excluded direct DNA damage to human fetal and adult fibroblasts exposed to microwaves. No induction of apoptosis or changes in prosurvival signalling proteins were detected. Moreover, CREST analysis showed for both the cell lines an increase in the total number of micronuclei and centromere positive micronuclei in exposed samples, indicating aneuploidy induction due to chromosome loss.

AI evidence extraction

Main findings

In vitro exposure of human fetal and adult fibroblasts to 25 GHz microwaves showed no evidence of direct DNA damage by comet assay, γH2AX, or CREST-negative micronuclei, and no induction of apoptosis or changes in prosurvival signalling proteins. However, exposed samples showed an increase in total micronuclei and centromere-positive micronuclei, interpreted as aneuploidy due to chromosome loss.

Outcomes measured

• DNA damage (comet assay)
• H2AX histone phosphorylation (γH2AX)
• Micronuclei frequency (CREST-negative and centromere-positive)
• Apoptosis
• Prosurvival signalling proteins
• Aneuploidy / chromosome loss

Limitations

• Exposure metrics (e.g., SAR, power density) not reported in the abstract
• Exposure duration not reported in the abstract
• In vitro study; relevance to long-term human health outcomes not addressed in the abstract

Suggested hubs

• 5g-policy (0.55)
  Exposure frequency is 25 GHz, within mmWave/upper microwave range relevant to some 5G discussions; study assesses biological/genotoxic endpoints.

{
    "study_type": "in_vitro",
    "exposure": {
        "band": "microwave",
        "source": null,
        "frequency_mhz": 25000,
        "sar_wkg": null,
        "duration": null
    },
    "population": "Human fetal and adult fibroblasts (cell lines)",
    "sample_size": null,
    "outcomes": [
        "DNA damage (comet assay)",
        "H2AX histone phosphorylation (γH2AX)",
        "Micronuclei frequency (CREST-negative and centromere-positive)",
        "Apoptosis",
        "Prosurvival signalling proteins",
        "Aneuploidy / chromosome loss"
    ],
    "main_findings": "In vitro exposure of human fetal and adult fibroblasts to 25 GHz microwaves showed no evidence of direct DNA damage by comet assay, γH2AX, or CREST-negative micronuclei, and no induction of apoptosis or changes in prosurvival signalling proteins. However, exposed samples showed an increase in total micronuclei and centromere-positive micronuclei, interpreted as aneuploidy due to chromosome loss.",
    "effect_direction": "mixed",
    "limitations": [
        "Exposure metrics (e.g., SAR, power density) not reported in the abstract",
        "Exposure duration not reported in the abstract",
        "In vitro study; relevance to long-term human health outcomes not addressed in the abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "microwave radiation",
        "25 GHz",
        "human fibroblasts",
        "genotoxicity",
        "comet assay",
        "γH2AX",
        "micronuclei",
        "CREST",
        "aneuploidy",
        "chromosome loss",
        "apoptosis"
    ],
    "suggested_hubs": [
        {
            "slug": "5g-policy",
            "weight": 0.5500000000000000444089209850062616169452667236328125,
            "reason": "Exposure frequency is 25 GHz, within mmWave/upper microwave range relevant to some 5G discussions; study assesses biological/genotoxic endpoints."
        }
    ]
}

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