The effect of Wi-Fi on elastic and collagen fibres in the blood vessel wall of the chorioallantoic membrane

Abstract

Category: Experimental Biology Tags: Wi-Fi, electromagnetic fields, collagen, elastic fibers, blood vessel wall, chorioallantoic membrane, cardiovascular risk DOI: 10.2754/avb202594020137 URL: actavet.vfu.cz Overview This study investigates the impact of Wi-Fi radiation on the structural fibers that compose large blood vessel walls in the chorioallantoic membrane (CAM) of chicken embryos. Experimental groups were exposed continuously (24 hours per day) to Wi-Fi at a frequency of 2.4 GHz and an average power density of 300 μW/m2 for either 9 or 14 embryonic days. Findings - Traditional haematoxylin and eosin staining did not reveal significant structural differences in large blood vessel walls between control and Wi-Fi-exposed embryos. - Special staining techniques, however, demonstrated marked changes in fibrous vessel wall components after Wi-Fi exposure: - The optical density (OD) of elastic fibers significantly decreased from 0.294 ± 0.025 (control) to 0.197 ± 0.022 (Wi-Fi) at day 9, and from 0.706 ± 0.028 (control) to 0.271 ± 0.031 (Wi-Fi) at day 14. - The OD of collagen fibers increased at day 9 (from 0.178 ± 0.023 to 0.334 ± 0.020), but showed a significant decrease by day 14 (from 0.418 ± 0.033 to 0.327 ± 0.031). Conclusion The results of this open access study indicate that Wi-Fi can alter the balance and composition of fibrous elements in the large vessel wall, potentially playing a role in the development of cardiovascular disorders. This supports concerns that electromagnetic fields such as those from Wi-Fi may adversely affect biological tissue and vascular health.

AI evidence extraction

Main findings

Continuous 2.4 GHz Wi‑Fi exposure (average power density 300 μW/m²) did not show significant differences in large vessel wall structure on H&E staining versus controls. Special stains showed decreased optical density of elastic fibers at embryonic day 9 and day 14 in exposed embryos. Collagen fiber optical density increased at day 9 but decreased by day 14 compared with controls.

Outcomes measured

• Histological structure of large blood vessel wall (H&E staining)
• Optical density of elastic fibers in vessel wall
• Optical density of collagen fibers in vessel wall

Limitations

• Sample size not reported in the provided abstract/metadata
• Exposure metric reported as average power density; SAR not reported
• Only histological/optical density endpoints reported in the abstract; functional cardiovascular outcomes not described
• Details of randomization/blinding and statistical methods not provided in the abstract

{
    "study_type": "animal",
    "exposure": {
        "band": "RF",
        "source": "wi-fi",
        "frequency_mhz": 2400,
        "sar_wkg": null,
        "duration": "Continuous (24 h/day) exposure for 9 or 14 embryonic days"
    },
    "population": "Chicken embryos (chorioallantoic membrane, CAM)",
    "sample_size": null,
    "outcomes": [
        "Histological structure of large blood vessel wall (H&E staining)",
        "Optical density of elastic fibers in vessel wall",
        "Optical density of collagen fibers in vessel wall"
    ],
    "main_findings": "Continuous 2.4 GHz Wi‑Fi exposure (average power density 300 μW/m²) did not show significant differences in large vessel wall structure on H&E staining versus controls. Special stains showed decreased optical density of elastic fibers at embryonic day 9 and day 14 in exposed embryos. Collagen fiber optical density increased at day 9 but decreased by day 14 compared with controls.",
    "effect_direction": "mixed",
    "limitations": [
        "Sample size not reported in the provided abstract/metadata",
        "Exposure metric reported as average power density; SAR not reported",
        "Only histological/optical density endpoints reported in the abstract; functional cardiovascular outcomes not described",
        "Details of randomization/blinding and statistical methods not provided in the abstract"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "Wi-Fi",
        "2.4 GHz",
        "radiofrequency",
        "electromagnetic fields",
        "power density",
        "chorioallantoic membrane",
        "chicken embryo",
        "blood vessel wall",
        "elastic fibers",
        "collagen fibers",
        "histology"
    ],
    "suggested_hubs": []
}

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