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Effect of global system for mobile communication microwave exposure on the genomic response of the rat brain.

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Fritze K, Wiessner C, Kuster N, Sommer C, Gass P, Hermann DM, Kiessling M,Hossmann KA, · 1997

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High-intensity cell phone radiation briefly activated brain stress responses in rats, but effects disappeared within 24 hours.

Plain English Summary

Summary written for general audiences

Scientists exposed rats to cell phone radiation for 24 hours at different power levels. Only the highest exposure caused temporary stress protein increases in brain cells, with effects disappearing within a day. This suggests brief cellular stress occurs at extreme levels but causes no lasting brain damage.

Why This Matters

This 1997 study provides important context for understanding how cell phone radiation affects brain tissue at the cellular level. The researchers tested exposure levels ranging from 0.3 to 7.5 W/kg - for comparison, modern smartphones typically operate at SAR levels around 1.0-1.6 W/kg when held against your head. The fact that even brief stress responses only occurred at the highest exposure level might seem reassuring, but this study only examined acute effects over 24 hours. What this research doesn't tell us is equally important: whether chronic, repeated exposures at lower levels might accumulate different effects over months or years of typical phone use. The temporary nature of the stress response also doesn't rule out the possibility that repeated activation of these cellular stress pathways could eventually lead to adaptive changes or cellular dysfunction.

Exposure Details

SAR
0.3, 1.5, and 7.5 W/kg
Exposure Duration
24 hours

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.3, 1.5, and 7.5 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern rangeFCC limit is 5x higher than this level

Study Details

The acute effect of global system for mobile communication (GSM) microwave exposure on the genomic response of the central nervous system was studied in rats by measuring changes in the messenger RNAs of hsp70, the transcription factor genes c-fos and c-jun and the glial structural gene GFAP using in situ hybridization histochemistry.

Protein products of transcription factors, stress proteins and marker proteins of astroglial and mic...

Immediately after exposure, in situ hybridization revealed slight induction of hsp70 messenger RNA i...

In conclusion, acute high intensity microwave exposure of immobilized rats may induce some minor stress response but does not result in lasting adaptive or reactive changes of the brain.

Cite This Study
Fritze K, Wiessner C, Kuster N, Sommer C, Gass P, Hermann DM, Kiessling M,Hossmann KA, (1997). Effect of global system for mobile communication microwave exposure on the genomic response of the rat brain. Neuroscience 81(3):627-639, 1997.
Show BibTeX
@article{k_1997_effect_of_global_system_983,
  author = {Fritze K and Wiessner C and Kuster N and Sommer C and Gass P and Hermann DM and Kiessling M andHossmann KA and},
  title = {Effect of global system for mobile communication microwave exposure on the genomic response of the rat brain.},
  year = {1997},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/9316016/},
}
PubMed: 9316016

Cited By (146 papers)

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Quick Questions About This Study

A 1997 study found that 24 hours of continuous GSM radiation at 7.5 W/kg caused temporary stress protein increases in rat brain cells. However, these effects disappeared within one day and caused no lasting brain damage or cellular changes.
High-intensity microwave exposure at 7.5 W/kg temporarily increased hsp70 stress proteins in rat cerebellum and hippocampus immediately after exposure. These stress markers completely disappeared within 24 hours, indicating no permanent cellular damage.
No, extreme GSM radiation levels up to 7.5 W/kg caused only temporary cellular stress responses in rat brains. Seven days after exposure, researchers found no increased cell growth or altered brain cell marker proteins.
Brain cell effects only occurred at 7.5 W/kg exposure levels in this rat study. Lower radiation intensities showed no impact on brain stress proteins, suggesting a threshold effect for cellular responses.
Immobilized rats exposed to high-intensity microwaves showed minor stress responses in brain cells, but immobilization stress itself also affected some brain regions. The radiation effects were separate and temporary, disappearing within 24 hours.