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900-MHz microwave radiation promotes oxidation in rat brain

Electromagn Biol Med · 2011 · Harm · Low evidence

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HarmLow evidencePaper 4433

In 35-day-old Wistar rats exposed to 900-MHz mobile phone radiation at SAR 0.9 W/kg for 2 h/day over 45 days, the exposed group showed significant decreases in glutathione peroxidase, superoxide dismutase, protein kinase C, and pineal melatonin, with signific…

Study snapshot

PublicationElectromagn Biol Med · 2011
Study typeanimal
Reported directionHarm
Evidence ratingLow

Abstract

Recently, there have been several reports referring to detrimental effects due to radio frequency electromagnetic fields (RF-EMF) exposure. Special attention was given to investigate the effect of mobile phone exposure on the rat brain. Since the integrative mechanism of the entire body lies in the brain, it is suggestive to analyze its biochemical aspects. For this, 35-day old Wistar rats were exposed to a mobile phone for 2 h per day for a duration of 45 days where specific absorption rate (SAR) was 0.9 W/Kg. Animals were divided in two groups: sham exposed (n = 6) and exposed group (n = 6). Our observations indicate a significant decrease (P < 0.05) in the level of glutathione peroxidase, superoxide dismutase, and an increase in catalase activity. Moreover, protein kinase shows a significant decrease in exposed group (P < 0.05) of hippocampus and whole brain. Also, a significant decrease (P < 0.05) in the level of pineal melatonin and a significant increase (P < 0.05) in creatine kinase and caspase 3 was observed in exposed group of whole brain as compared with sham exposed. Finally, a significant increase in the level of ROS (reactive oxygen species) (P < 0.05) was also recorded. The study concludes that a reduction or an increase in antioxidative enzyme activities, protein kinase C, melatonin, caspase 3, and creatine kinase are related to overproduction of reactive oxygen species (ROS) in animals under mobile phone radiation exposure. Our findings on these biomarkers are clear indications of possible health implications.

Machine Enhanced Logic

AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeanimal
Effect directionharm
Population35-day-old Wistar rats
Sample size12
ExposureRF · 900 MHz · 0.9 W/kg · 2 h/day for 45 days
Evidence strengthLowConfidence: 97% · Peer reviewed: yes

Main findings

In 35-day-old Wistar rats exposed to 900-MHz mobile phone radiation at SAR 0.9 W/kg for 2 h/day over 45 days, the exposed group showed significant decreases in glutathione peroxidase, superoxide dismutase, protein kinase C, and pineal melatonin, with significant increases in catalase activity, creatine kinase, caspase 3, and ROS compared with sham-exposed rats. The authors interpreted these changes as indicating oxidative stress in the brain under exposure conditions.

Outcomes measured

  • glutathione peroxidase
  • superoxide dismutase
  • catalase activity
  • protein kinase C
  • pineal melatonin
  • creatine kinase
  • caspase 3
  • reactive oxygen species (ROS)
  • oxidative stress biomarkers in hippocampus and whole brain

Limitations

  • Animal study
  • Small sample size (n=6 per group)
  • Abstract does not report randomization or blinding
  • Biochemical endpoints only; no direct clinical outcomes reported
View raw extracted JSON
{
  "study_type": "animal",
  "exposure": {
    "band": "RF",
    "source": "mobile phone",
    "frequency_mhz": 900,
    "sar_wkg": 0.9,
    "duration": "2 h/day for 45 days"
  },
  "population": "35-day-old Wistar rats",
  "sample_size": 12,
  "outcomes": [
    "glutathione peroxidase",
    "superoxide dismutase",
    "catalase activity",
    "protein kinase C",
    "pineal melatonin",
    "creatine kinase",
    "caspase 3",
    "reactive oxygen species (ROS)",
    "oxidative stress biomarkers in hippocampus and whole brain"
  ],
  "main_findings": "In 35-day-old Wistar rats exposed to 900-MHz mobile phone radiation at SAR 0.9 W/kg for 2 h/day over 45 days, the exposed group showed significant decreases in glutathione peroxidase, superoxide dismutase, protein kinase C, and pineal melatonin, with significant increases in catalase activity, creatine kinase, caspase 3, and ROS compared with sham-exposed rats. The authors interpreted these changes as indicating oxidative stress in the brain under exposure conditions.",
  "effect_direction": "harm",
  "limitations": [
    "Animal study",
    "Small sample size (n=6 per group)",
    "Abstract does not report randomization or blinding",
    "Biochemical endpoints only; no direct clinical outcomes reported"
  ],
  "evidence_strength": "low",
  "confidence": 0.97,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "900 MHz",
    "microwave radiation",
    "RF-EMF",
    "mobile phone",
    "rat brain",
    "Wistar rats",
    "oxidative stress",
    "ROS",
    "melatonin",
    "caspase 3",
    "protein kinase C",
    "antioxidant enzymes"
  ],
  "suggested_hubs": []
}
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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.3109/15368378.2011.587930
PubMed: 22047460

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