Prophylactic Effects of Radiofrequency Electromagnetic Field on Pulmonary Ischemia-Reperfusion via HIF-1α/eNOS Pathway and BCL2/BAX Signaling.

Abstract

This study aimed to investigate the vascular effects of a radiofrequency electromagnetic field (RF-EMF) applied in the lung ischemia and reperfusion (IR) model on the hypoxia-inducible factor 1 alpha (Hif-1α)/endothelial nitric oxide synthase (eNOS) pathway and B cell lymphoma 2 (BCL2)/BCL-2 associated X protein (BAX signaling. Forty male Wistar rats were randomly divided into four groups, each consisting of 10 rats: Sham, IR, IR + RF-EMF, and RF-EMF. IR was applied to rats by 60 min of clamping hilus of left lungs and 60 min of reperfusion. Rats were kept in the RF-EMF unit for 60 min with or without activation. After sacrification, lung tissues were excised for histopathological, immunohistochemical, biochemical, and genetic analyses. IR injury led to increased damage-related emphysematous findings, significant hyperemia, and increased septal tissue thickness, as observed histopathologically, and immunoexpression levels of tumor necrosis factor-alpha and caspase-3. In addition, it was noted that the biochemical parameters total oxidant status, oxidative stress index, and genetic parameters Hif 1 α, eNOS, BAX increased, and BCL2 decreased due to IR damage. In the IR-RF-EMF group, improvement has been detected in all parameters. RF-EMF applied in the IR model exerts antioxidant, antiapoptotic, and anti-inflammatory effects on lung tissue damage through the Hif-1α/eNOS pathway and BCL-2/BAX signaling. The use of RF-EMF in IR damage is promising, as models that examine the long-term effects of RF-EMF at different frequencies.

AI evidence extraction

Main findings

In a rat lung ischemia-reperfusion model, IR increased histopathologic damage, TNF-alpha and caspase-3 immunoexpression, oxidative stress markers (total oxidant status, oxidative stress index), and Hif-1α/eNOS/BAX, while decreasing BCL2. In the IR + RF-EMF group, improvement was detected across these parameters, and the authors conclude RF-EMF had antioxidant, antiapoptotic, and anti-inflammatory effects via Hif-1α/eNOS and BCL2/BAX signaling.

Outcomes measured

• Histopathology (emphysematous findings, hyperemia, septal tissue thickness)
• Immunohistochemistry/immunoexpression (TNF-alpha, caspase-3)
• Biochemical oxidative stress markers (total oxidant status, oxidative stress index)
• Genetic parameters/expression (Hif-1α, eNOS, BAX, BCL2)

Limitations

• RF-EMF frequency not reported in abstract
• SAR/dose metrics not reported in abstract
• Short exposure and acute model; long-term effects not assessed (authors note need for long-term models at different frequencies)
• Animal model; generalizability to humans not established

{
    "study_type": "animal",
    "exposure": {
        "band": "RF",
        "source": "other",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "60 min"
    },
    "population": "Male Wistar rats",
    "sample_size": 40,
    "outcomes": [
        "Histopathology (emphysematous findings, hyperemia, septal tissue thickness)",
        "Immunohistochemistry/immunoexpression (TNF-alpha, caspase-3)",
        "Biochemical oxidative stress markers (total oxidant status, oxidative stress index)",
        "Genetic parameters/expression (Hif-1α, eNOS, BAX, BCL2)"
    ],
    "main_findings": "In a rat lung ischemia-reperfusion model, IR increased histopathologic damage, TNF-alpha and caspase-3 immunoexpression, oxidative stress markers (total oxidant status, oxidative stress index), and Hif-1α/eNOS/BAX, while decreasing BCL2. In the IR + RF-EMF group, improvement was detected across these parameters, and the authors conclude RF-EMF had antioxidant, antiapoptotic, and anti-inflammatory effects via Hif-1α/eNOS and BCL2/BAX signaling.",
    "effect_direction": "benefit",
    "limitations": [
        "RF-EMF frequency not reported in abstract",
        "SAR/dose metrics not reported in abstract",
        "Short exposure and acute model; long-term effects not assessed (authors note need for long-term models at different frequencies)",
        "Animal model; generalizability to humans not established"
    ],
    "evidence_strength": "low",
    "confidence": 0.7800000000000000266453525910037569701671600341796875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "radiofrequency electromagnetic field",
        "RF-EMF",
        "ischemia-reperfusion",
        "lung",
        "pulmonary",
        "HIF-1α",
        "eNOS",
        "BCL2",
        "BAX",
        "oxidative stress",
        "TNF-alpha",
        "caspase-3",
        "Wistar rats"
    ],
    "suggested_hubs": []
}

Comments

Log in to comment.

No comments yet.