Impact of extremely low-frequency magnetic fields on neuroinflammation and synaptic protein development in prenatal and postnatal rat brains

Abstract

Brain development during prenatal and postnatal periods is critical, and external stressors such as electromagnetic fields can significantly influence this process. Although there are numerous studies on this topic, our understanding of how electromagnetic fields affect the central nervous system remains limited. In this study, we investigated the effects of extremely low-frequency magnetic fields (ELF-MF) on the developing brains of Sprague-Dawley rats. The rats were exposed to 50 Hz, 500 µT ELF-MF during prenatal, postnatal, or both periods. Using ELISA, we assessed inflammatory markers and synaptic protein levels in two brain regions. Combined prenatal and postnatal exposure to ELF-MF significantly increased IL-17A levels in the hippocampus and cortex and elevated IFN-γ levels in the cortex. However, there was no change in IL-4 levels. Additionally, in the combined prenatal and postnatal exposure group, ELF-MF significantly reduced PSD-95 levels in both the cortex and hippocampus, and Syn1 levels in the hippocampus. Our results suggest that ELF-MF may trigger inflammation in the brains of young rats, potentially impairing synaptic transmission, particularly in the hippocampus where reduced Syn1 may limit presynaptic neurotransmitter release. This study provides new insights into the impact of ELF-MF on brain development and underscores the need for further research in this field.

AI evidence extraction

Main findings

Combined prenatal and postnatal exposure to 50 Hz, 500 µT magnetic fields increased IL-17A in the hippocampus and cortex and IFN-γ in the cortex, while IL-4 was unchanged. In the combined-exposure group, PSD-95 decreased in both regions and Syn1 decreased in the hippocampus.

Outcomes measured

• IL-17A, IFN-γ, and IL-4 levels in the hippocampus and cortex
• PSD-95 levels in the hippocampus and cortex
• Syn1 levels in the hippocampus and cortex

Limitations

• Animal findings do not establish effects in humans.
• Sample size and exposure duration are not stated in the abstract.

{
    "study_type": "animal",
    "exposure": {
        "band": "ELF",
        "source": null,
        "frequency_mhz": 5.00000000000000023960868011929647991564706899225711822509765625e-5,
        "sar_wkg": null,
        "duration": null
    },
    "population": "Developing Sprague-Dawley rats exposed prenatally, postnatally, or during both periods",
    "sample_size": null,
    "outcomes": [
        "IL-17A, IFN-γ, and IL-4 levels in the hippocampus and cortex",
        "PSD-95 levels in the hippocampus and cortex",
        "Syn1 levels in the hippocampus and cortex"
    ],
    "main_findings": "Combined prenatal and postnatal exposure to 50 Hz, 500 µT magnetic fields increased IL-17A in the hippocampus and cortex and IFN-γ in the cortex, while IL-4 was unchanged. In the combined-exposure group, PSD-95 decreased in both regions and Syn1 decreased in the hippocampus.",
    "effect_direction": "harm",
    "limitations": [
        "Animal findings do not establish effects in humans.",
        "Sample size and exposure duration are not stated in the abstract."
    ],
    "evidence_strength": "low",
    "confidence": 0.939999999999999946709294817992486059665679931640625,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "extremely low-frequency magnetic fields",
        "ELF-MF",
        "50 Hz",
        "prenatal exposure",
        "postnatal exposure",
        "rat brain development",
        "neuroinflammation",
        "synaptic proteins"
    ],
    "suggested_hubs": []
}

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