Effects of extremely low-frequency electromagnetic fields (ELF-EMF) exposure on B6C3F1 mice

Abstract

Objective: Long-term exposure study was conducted to investigate the effects of extremely low-frequency electromagnetic field on the tumor promotion process and fertility. Methods: Ten pregnant C57BL/6NCrj mice were exposed to 50 Hz field 500 mG for 1 week (12 h per day), and 24 male and 42 female B6C3F1mice born from them were further exposed up to 15.5 months. As a control group, 10 pregnant mice were bred without exposure, and 30 produced male and 32 female mice were observed without exposure for the same period. Results: Mean body weights of exposed groups of male and female mice were decreased significantly than those of the control groups. In exposed mice, there was no increased incidence of liver and lung tumor. In female mice, the incidence of chronic myeloid leukemia [3/42 (7%)] in the exposed group was significantly greater than in the control group. The size of seminiferous tubules in the EMF exposed groups were significantly less than the control group. Conclusions: These data support the hypothesis that long-term exposure of 50 Hz magnetic fields is a significant risk factor for neoplastic development and fertility in mice.

AI evidence extraction

Main findings

Male and female exposed mice had significantly decreased mean body weights versus controls. Exposed mice did not show increased incidence of liver or lung tumors; however, female mice had a significantly higher incidence of chronic myeloid leukemia (3/42; 7%) than controls. Seminiferous tubule size was significantly smaller in EMF-exposed groups than controls.

Outcomes measured

• Body weight
• Liver tumor incidence
• Lung tumor incidence
• Chronic myeloid leukemia incidence (female mice)
• Seminiferous tubule size (male fertility-related outcome)
• Tumor promotion process
• Fertility

Limitations

• Exposure source/context not specified beyond field frequency and intensity
• Details of statistical methods and effect sizes (beyond stated significant differences) not provided in abstract
• Only certain tumor types explicitly reported (liver, lung, chronic myeloid leukemia)

Suggested hubs

• animal-studies (0.9)
  Long-term ELF magnetic-field exposure experiment in mice assessing tumors and fertility-related endpoints.

{
    "study_type": "animal",
    "exposure": {
        "band": "ELF",
        "source": null,
        "frequency_mhz": 0.05000000000000000277555756156289135105907917022705078125,
        "sar_wkg": null,
        "duration": "Pregnant mice: 1 week, 12 h/day; offspring: up to 15.5 months"
    },
    "population": "B6C3F1 mice (offspring of C57BL/6NCrj pregnant mice)",
    "sample_size": 128,
    "outcomes": [
        "Body weight",
        "Liver tumor incidence",
        "Lung tumor incidence",
        "Chronic myeloid leukemia incidence (female mice)",
        "Seminiferous tubule size (male fertility-related outcome)",
        "Tumor promotion process",
        "Fertility"
    ],
    "main_findings": "Male and female exposed mice had significantly decreased mean body weights versus controls. Exposed mice did not show increased incidence of liver or lung tumors; however, female mice had a significantly higher incidence of chronic myeloid leukemia (3/42; 7%) than controls. Seminiferous tubule size was significantly smaller in EMF-exposed groups than controls.",
    "effect_direction": "mixed",
    "limitations": [
        "Exposure source/context not specified beyond field frequency and intensity",
        "Details of statistical methods and effect sizes (beyond stated significant differences) not provided in abstract",
        "Only certain tumor types explicitly reported (liver, lung, chronic myeloid leukemia)"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "ELF-EMF",
        "50 Hz",
        "magnetic field",
        "500 mG",
        "mouse",
        "B6C3F1",
        "tumor",
        "chronic myeloid leukemia",
        "fertility",
        "seminiferous tubules",
        "long-term exposure"
    ],
    "suggested_hubs": [
        {
            "slug": "animal-studies",
            "weight": 0.90000000000000002220446049250313080847263336181640625,
            "reason": "Long-term ELF magnetic-field exposure experiment in mice assessing tumors and fertility-related endpoints."
        }
    ]
}

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