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GFAP expression in the rat brain following sub-chronic exposure to a 900 MHz electromagnetic field signal.

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Ammari M, Gamez C, Lecomte A, Sakly M, Abdelmelek H, De Seze R. · 2010

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Chronic cell phone radiation exposure triggered lasting brain inflammation in rats at levels near current safety limits.

Plain English Summary

Summary written for general audiences

French researchers exposed rats to cell phone radiation for 8 weeks and found increased brain inflammation markers that lasted at least 10 days after exposure ended. This suggests chronic mobile phone use may trigger inflammatory brain responses similar to those seen in neurodegenerative diseases.

Why This Matters

This study provides compelling evidence that chronic exposure to cell phone radiation can trigger neuroinflammation in the brain. The researchers found increased GFAP expression across multiple brain regions, including the prefrontal cortex and hippocampus - areas critical for cognition and memory. What makes this particularly concerning is that the effects persisted for at least 10 days after exposure ended, suggesting the brain changes aren't simply a temporary response but may represent lasting damage. The exposure levels used (1.5 and 6 W/kg SAR) bracket the current safety limit of 2 W/kg, meaning one group experienced exposures within current guidelines while the other exceeded them. Both groups showed brain changes. The reality is that gliosis - the inflammatory response measured in this study - is associated with neurodegenerative diseases and brain injury. While we can't directly extrapolate from rats to humans, this research adds to a growing body of evidence suggesting that our current safety standards may not adequately protect the brain from chronic EMF exposure.

Exposure Details

SAR
6 W/kg
Source/Device
900-MHz
Exposure Duration
15 min/day for 5 days a week during an eight-week period

Exposure Context

This study used 6 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: 6 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern rangeFCC limit is 0x 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

This study aims at measuring the glial fibrillary acidic protein (GFAP) expression in 48 rat brains to evaluate reactive astrocytosis, three and 10 days after long-term head-only sub-chronic exposure to a 900 MHz electromagnetic field (EMF) signal, in male rats.

Sprague-Dawley rats were exposed for 45 min/day at a brain-averaged specific absorption rate (SAR) =...

Compared to the sham-treated rats, those exposed to the sub-chronic GSM (Global System for mobile co...

Our results show that sub-chronic exposures to a 900 MHz EMF signal for two months could adversely affect rat brain (sign of a potential gliosis).

Cite This Study
Ammari M, Gamez C, Lecomte A, Sakly M, Abdelmelek H, De Seze R. (2010). GFAP expression in the rat brain following sub-chronic exposure to a 900 MHz electromagnetic field signal. Int J Radiat Biol. 86(5):367-375, 2010.
Show BibTeX
@article{m_2010_gfap_expression_in_the_816,
  author = {Ammari M and Gamez C and Lecomte A and Sakly M and Abdelmelek H and De Seze R.},
  title = {GFAP expression in the rat brain following sub-chronic exposure to a 900 MHz electromagnetic field signal.},
  year = {2010},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/20397841/},
}
PubMed: 20397841

Cited By (51 papers)

View all 51 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, French researchers found that rats exposed to 900 MHz cell phone radiation for 8 weeks showed increased brain inflammation markers (GFAP) that persisted for at least 10 days after exposure ended, suggesting potential long-term inflammatory responses.
GFAP (glial fibrillary acidic protein) is a brain inflammation marker. This 2010 study found that 900 MHz GSM radiation at 1.5 or 6 W/kg increased GFAP levels across multiple brain regions, indicating inflammatory responses similar to neurodegenerative diseases.
Research suggests yes. Rats exposed to 900 MHz radiation for 2 months showed signs of potential gliosis (brain tissue scarring) with elevated inflammation markers persisting days after exposure, indicating chronic mobile phone use may trigger harmful brain responses.
According to this rat study, brain inflammation markers remained elevated for at least 10 days after stopping 900 MHz radiation exposure, suggesting that inflammatory brain responses from cell phone radiation may persist beyond the actual exposure period.
Yes, this study found brain inflammation at both 1.5 W/kg and 6 W/kg SAR levels from 900 MHz radiation. Both exposure levels caused increased GFAP markers across different brain areas, indicating dose-related inflammatory responses in rat brains.