[Effect of low-intensity 900 MHz frequency electromagnetic radiation on rat liver and blood serum enzyme activities].

Abstract

The comparative analysis of the rat liver and blood serum creatine kinase, alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase and purine nucleoside phosphorylase post-radiation activity levels after a total two-hour long single and fractional exposure of the animals to low-intensity 900 MHz frequency electromagnetic field showed that the most sensitive enzymes to the both schedules of radiation are the liver creatine kinase, as well as the blood serum creatine kinase and alkaline phosphatase. According to the comparative analysis of the dynamics of changes in the activity level of the liver and blood serum creatine kinase, alanine aminotransferase, aspartate aminotransferase and purine nucleoside phosphorylase, both single and fractional radiation schedules do not affect the permeability of a hepatocyte cell membrane, but rather cause changes in their energetic metabolism. The correlation analysis of the post-radiation activity level changes of the investigated enzymes did not reveal a clear relationship between them. The dynamics of post-radiation changes in the activity of investigated enzyme levels following a single and short-term fractional schedules of radiation did not differ essentially.

AI evidence extraction

Main findings

After low-intensity 900 MHz EMF exposure (single vs fractional schedules; total 2 hours), the most sensitive enzymes were liver creatine kinase and blood serum creatine kinase and alkaline phosphatase. The reported enzyme activity dynamics suggested no effect on hepatocyte membrane permeability, but changes consistent with altered energetic metabolism. Post-radiation enzyme activity changes did not show a clear correlation across enzymes, and dynamics were not essentially different between single and fractional exposure schedules.

Outcomes measured

• Liver enzyme activity (creatine kinase, alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, purine nucleoside phosphorylase)
• Blood serum enzyme activity (creatine kinase, alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, purine nucleoside phosphorylase)
• Hepatocyte cell membrane permeability (inferred from enzyme dynamics)
• Energetic metabolism changes (inferred from enzyme dynamics)

Limitations

• No sample size reported in abstract
• Exposure intensity described as 'low-intensity' without quantitative dosimetry (e.g., SAR)
• No details on control/sham conditions provided in abstract
• Outcome interpretation (membrane permeability, energetic metabolism) is indirect based on enzyme activity dynamics

{
    "study_type": "animal",
    "exposure": {
        "band": "RF",
        "source": null,
        "frequency_mhz": 900,
        "sar_wkg": null,
        "duration": "total two-hour long; single and fractional exposure schedules"
    },
    "population": "rats",
    "sample_size": null,
    "outcomes": [
        "Liver enzyme activity (creatine kinase, alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, purine nucleoside phosphorylase)",
        "Blood serum enzyme activity (creatine kinase, alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, purine nucleoside phosphorylase)",
        "Hepatocyte cell membrane permeability (inferred from enzyme dynamics)",
        "Energetic metabolism changes (inferred from enzyme dynamics)"
    ],
    "main_findings": "After low-intensity 900 MHz EMF exposure (single vs fractional schedules; total 2 hours), the most sensitive enzymes were liver creatine kinase and blood serum creatine kinase and alkaline phosphatase. The reported enzyme activity dynamics suggested no effect on hepatocyte membrane permeability, but changes consistent with altered energetic metabolism. Post-radiation enzyme activity changes did not show a clear correlation across enzymes, and dynamics were not essentially different between single and fractional exposure schedules.",
    "effect_direction": "mixed",
    "limitations": [
        "No sample size reported in abstract",
        "Exposure intensity described as 'low-intensity' without quantitative dosimetry (e.g., SAR)",
        "No details on control/sham conditions provided in abstract",
        "Outcome interpretation (membrane permeability, energetic metabolism) is indirect based on enzyme activity dynamics"
    ],
    "evidence_strength": "low",
    "confidence": 0.7399999999999999911182158029987476766109466552734375,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "900 MHz",
        "radiofrequency",
        "electromagnetic field",
        "rats",
        "liver",
        "blood serum",
        "enzyme activity",
        "creatine kinase",
        "alkaline phosphatase",
        "alanine aminotransferase",
        "aspartate aminotransferase",
        "purine nucleoside phosphorylase"
    ],
    "suggested_hubs": []
}

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