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Oxidative Stress165 citations

Melatonin reduces oxidative stress induced by chronic exposure of microwave radiation from mobile phones in rat brain.

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Sokolovic D, Djindjic B, Nikolic J, Bjelakovic G, Pavlovic D, Kocic G, Krstic D, Cvetkovic T, Pavlovic V. · 2008

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Mobile phone radiation caused brain oxidative damage at levels below current safety limits, but melatonin provided significant protection.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to mobile phone radiation for 20 to 60 days and found it caused oxidative damage in brain tissue, measured by increased levels of harmful molecules and decreased protective enzyme activity. When the rats were also given melatonin (a natural hormone), it significantly prevented some of this brain damage. This suggests that mobile phone radiation can harm brain cells through oxidative stress, but melatonin may offer some protection.

Why This Matters

This study adds important evidence to the growing body of research showing that mobile phone radiation can cause biological harm at levels well below current safety limits. The SAR levels used (0.043-0.135 W/kg) are actually lower than the maximum allowed for phones sold in the US (1.6 W/kg), yet still produced measurable oxidative damage in brain tissue after just 20 days of exposure. What makes this research particularly significant is that it demonstrates a clear biological mechanism - oxidative stress - by which RF radiation damages cells. The fact that melatonin provided partial protection suggests the damage is real and preventable, not just a measurement artifact. While this was an animal study, the biological processes involved are fundamentally similar in humans. The science demonstrates that chronic exposure to mobile phone radiation, even at supposedly 'safe' levels, can accumulate cellular damage over time.

Exposure Details

SAR
0.043-0.135 W/kg
Exposure Duration
20, 40 and 60 days

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.043-0.135 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Severe Concern rangeFCC limit is 37x higher than this level

Study Details

The aim of the study was to evaluate the intensity of oxidative stress in the brain of animals chronically exposed to mobile phones and potential protective effects of melatonin in reducing oxidative stress and brain injury.

Experiments were performed on Wistar rats exposed to microwave radiation during 20, 40 and 60 days. ...

A significant increase in the brain tissue malondialdehyde (MDA) and carbonyl group concentration wa...

We demonstrated two important findings; that mobile phones caused oxidative damage biochemically by increasing the levels of MDA, carbonyl groups, XO activity and decreasing CAT activity; and that treatment with the melatonin significantly prevented oxidative damage in the brain.

Cite This Study
Sokolovic D, Djindjic B, Nikolic J, Bjelakovic G, Pavlovic D, Kocic G, Krstic D, Cvetkovic T, Pavlovic V. (2008). Melatonin reduces oxidative stress induced by chronic exposure of microwave radiation from mobile phones in rat brain. J Radiat Res (Tokyo). 49(6):579-586, 2008.
Show BibTeX
@article{d_2008_melatonin_reduces_oxidative_stress_572,
  author = {Sokolovic D and Djindjic B and Nikolic J and Bjelakovic G and Pavlovic D and Kocic G and Krstic D and Cvetkovic T and Pavlovic V.},
  title = {Melatonin reduces oxidative stress induced by chronic exposure of microwave radiation from mobile phones in rat brain.},
  year = {2008},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/18827438/},
}
PubMed: 18827438

Cited By (165 papers)

View all 165 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, research shows melatonin can provide partial protection. A 2008 study found that rats given melatonin while exposed to mobile phone radiation had significantly reduced brain damage markers compared to those without melatonin treatment, though protection wasn't complete for all damage types.
Yes, studies demonstrate that chronic mobile phone radiation exposure increases oxidative stress in brain tissue. Research on rats exposed for 20-60 days showed elevated harmful molecules and decreased protective enzyme activity, indicating cellular damage from radiation exposure.
Mobile phone radiation significantly increases malondialdehyde (MDA) and carbonyl group levels in brain tissue, both indicators of cellular damage. The radiation also decreases catalase enzyme activity while increasing xanthine oxidase activity, disrupting the brain's natural protective systems.
Brain damage from mobile phone radiation becomes measurable within 20 days of exposure. Research shows oxidative stress markers continue increasing through 40-60 days of chronic exposure, with some enzyme changes persisting even after longer exposure periods.
Catalase enzyme activity significantly decreases in brain tissue after mobile phone radiation exposure. This 2008 study found reduced catalase activity persisted after 40-60 days of exposure, weakening the brain's ability to neutralize harmful hydrogen peroxide molecules.