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Brain & Nervous System115 citations

900-MHz microwave radiation promotes oxidation in rat brain.

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Kesari KK, Kumar S, Behari J. · 2011

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Cell phone radiation at near-regulatory limits caused measurable oxidative stress and antioxidant disruption in rat brains after 45 days of exposure.

Plain English Summary

Summary written for general audiences

Researchers exposed young rats to cell phone radiation (900 MHz) for two hours daily over 45 days. The study found increased harmful molecules and reduced protective antioxidants in brain tissue, suggesting cell phone radiation may cause oxidative stress that could contribute to neurological problems.

Why This Matters

This study adds important evidence to our understanding of how cell phone radiation affects brain chemistry at the cellular level. The SAR level of 0.9 W/kg used in this research is close to the maximum allowed for cell phones in many countries (2.0 W/kg), making these findings directly relevant to everyday phone use. The researchers documented multiple markers of oxidative stress - essentially cellular 'rusting' that can damage brain cells over time. What makes this research particularly significant is that it measured not just one effect, but a cascade of related changes including disrupted antioxidant enzymes, reduced protective melatonin, and increased cellular damage markers. The 45-day exposure period, while relatively short, showed clear biological impacts that suggest cumulative effects from regular phone use. These findings align with a growing body of research showing that RF radiation can trigger oxidative stress in brain tissue, even at exposure levels considered 'safe' by current regulations.

Exposure Details

SAR
0.9 W/kg
Source/Device
900 MHz
Exposure Duration
2 h per day for a duration of 45 days

Exposure Context

This study used 0.9 W/kg for SAR (device absorption):

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.9 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern rangeFCC limit is 2x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 900 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to observe 900-MHz microwave radiation promotes oxidation in rat brain

35-day old Wistar rats were exposed to a mobile phone for 2 h per day for a duration of 45 days wher...

Our observations indicate a significant decrease (P < 0.05) in the level of glutathione peroxidase, ...

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.

Cite This Study
Kesari KK, Kumar S, Behari J. (2011). 900-MHz microwave radiation promotes oxidation in rat brain. Electromagn Biol Med. 30(4):219-234, 2011.
Show BibTeX
@article{kk_2011_900mhz_microwave_radiation_promotes_540,
  author = {Kesari KK and Kumar S and Behari J.},
  title = {900-MHz microwave radiation promotes oxidation in rat brain.},
  year = {2011},
  doi = {10.3109/15368378.2011.587930},
  url = {https://www.tandfonline.com/doi/abs/10.3109/15368378.2011.587930},
}
DOI: 10.3109/15368378.2011.587930

Cited By (115 papers)

View all 115 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, a 2011 study found that exposing young rats to 900 MHz cell phone radiation for 2 hours daily over 45 days significantly increased harmful reactive oxygen species while reducing protective antioxidants like glutathione peroxidase and superoxide dismutase in brain tissue.
Research shows that 900 MHz cell phone radiation exposure significantly decreased pineal melatonin levels in rat brains after 45 days of 2-hour daily exposure sessions, suggesting this frequency may disrupt the brain's natural melatonin production and sleep regulation mechanisms.
A study found that 2 hours of daily 900 MHz radiation exposure for 45 days significantly decreased protein kinase levels in both the hippocampus and whole brain of young rats, indicating potential impacts on memory and learning centers.
After 45 days of 900 MHz radiation exposure, rat brains showed decreased glutathione peroxidase and superoxide dismutase (protective antioxidants), increased catalase activity, and elevated caspase 3 and creatine kinase levels, indicating cellular stress and potential damage pathways.
Yes, the 2011 study found significantly increased caspase 3 levels in rat brains after 45 days of 900 MHz exposure. Caspase 3 is a key enzyme involved in programmed cell death, suggesting chronic radiation may trigger brain cell death pathways.