Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
Heat shock protein induction in fetal mouse brain as a measure of stress after whole of gestation exposure to mobile telephony radiofrequency fields
Finnie JW, Chidlow G, Blumbergs PC, Manavis J, Cai Z · 2009
View Original AbstractFetal mouse brains showed no stress response to 4 W/kg cell phone radiation throughout pregnancy, suggesting resilience to high-level RF exposure.
Plain English Summary
Researchers exposed pregnant mice to 900 MHz cell phone radiation (at 4 W/kg) for one hour daily throughout pregnancy to see if it caused stress in developing fetal brains. They found no evidence of cellular stress responses when they examined the brain tissue using specialized markers called heat shock proteins. This suggests that this level of radiofrequency exposure during pregnancy may not trigger detectable stress responses in developing brain tissue.
Why This Matters
This study provides valuable data on prenatal RF exposure effects, examining stress responses in developing brain tissue at a relatively high SAR level of 4 W/kg. For context, this exposure level is roughly four times higher than the 1 W/kg limit for cell phones in Europe and significantly above typical phone usage levels. The absence of heat shock protein induction suggests that even at these elevated exposure levels, the fetal brain may not exhibit the cellular stress responses that often precede more serious biological effects. However, it's important to note that heat shock proteins represent just one marker of cellular stress. The science demonstrates that biological effects can occur through multiple pathways, and the absence of one stress marker doesn't rule out other potential impacts on the developing nervous system.
Exposure Details
- SAR
- 4 W/kg
- Source/Device
- 900 MHz
- Exposure Duration
- 60 min/day from day 1 to day 19 of gestation
Exposure Context
This study used 4 W/kg for SAR (device absorption):
- 10x above the Building Biology guideline of 0.4 W/kg
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 Details
To determine whether whole of gestation exposure of fetal mouse brain to mobile telephone radiofrequency fields produces a stress response detectable by induction of heat shock proteins (HSPs).
Using a purpose-designed exposure system at 900 MHz, pregnant mice were given a single, far-field, w...
There was no induction of HSP32 or 70 in any brains, while HSP25 expression was limited to two brain...
Whole of gestation exposure of fetal mouse brains to mobile phone radiofrequency fields did not produce any stress response using HSPs as an immunohistochemical marker.
Show BibTeX
@article{jw_2009_heat_shock_protein_induction_2753,
author = {Finnie JW and Chidlow G and Blumbergs PC and Manavis J and Cai Z},
title = {Heat shock protein induction in fetal mouse brain as a measure of stress after whole of gestation exposure to mobile telephony radiofrequency fields},
year = {2009},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0031302516320244},
}