6,486 Studies Reviewed. 85.2% of Original Studies Found Biological Effects. The Evidence is Clear.
Shield Your Body

Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

Cellular Effects

The Heat-Shock Factor is not Activated in Mammalian Cells Exposed to Cellular Phone Frequency Microwaves.

No Effects Found

Laszlo, A., Moros, E. G., Davidson, T., Bradbury, M., Straube, W. and Roti Roti, J. · 2005

View Original Abstract
Share:

Cell phone radiation up to 5 W/kg did not activate cellular stress responses in this study, but other biological pathways remain under investigation.

Plain English Summary

Summary written for general audiences

Researchers tested whether cell phone radiation triggers the cellular stress response in mammalian cells by measuring heat-shock factor activation, a key protein that responds to cellular stress. They exposed hamster, mouse, and human cells to both low (0.6 W/kg) and high (5 W/kg) levels of cell phone frequency radiation but found no activation of this stress response pathway. This suggests that cell phone radiation at these levels does not trigger the specific cellular stress mechanism that some scientists theorized could contribute to cancer development.

Why This Matters

This study addresses a specific proposed mechanism by which cell phone radiation might contribute to cancer development through cellular stress pathways. The researchers tested exposure levels ranging from 0.6 W/kg (below typical phone use) to 5 W/kg (well above the 2 W/kg SAR limit for phones). While finding no stress response activation might seem reassuring, it's important to understand this examines just one potential pathway among many. The science demonstrates that EMF exposure can affect cells through multiple mechanisms beyond heat-shock protein activation. What this means for you is that while this particular stress pathway may not be triggered at these exposure levels, it doesn't rule out other biological effects that numerous studies have documented at similar or lower intensities.

Exposure Details

SAR
0.6, 5 W/kg

Exposure Context

This study used 0.6, 5 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: 0.6, 5 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)FCC limit is 3 times higher than this level

Study Details

The determination of whether nonthermal effects of radiofrequency electromagnetic radiation contribute to the process leading to malignancy is an important task. One proposed pathway to malignancy involves the induction of the stress response by exposures to cell phone frequency microwaves.

The first step in the induction of the stress response is the activation of the DNA-binding activity...

The DNA-binding activity of HSF was monitored using a gel shift assay; the calibration of this assay...

Our results do not support the notion that the stress response is activated as a consequence of exposure to microwaves of frequencies associated with mobile communication devices.

Cite This Study
Laszlo, A., Moros, E. G., Davidson, T., Bradbury, M., Straube, W. and Roti Roti, J. (2005). The Heat-Shock Factor is not Activated in Mammalian Cells Exposed to Cellular Phone Frequency Microwaves. Radiat. Res. 164, 163-172, 2005.
Show BibTeX
@article{laszlo_2005_the_heatshock_factor_is_3181,
  author = {Laszlo and A. and Moros and E. G. and Davidson and T. and Bradbury and M. and Straube and W. and Roti Roti and J.},
  title = {The Heat-Shock Factor is not Activated in Mammalian Cells Exposed to Cellular Phone Frequency Microwaves.},
  year = {2005},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/16038587/},
}
PubMed: 16038587

Cited By (34 papers)

Quick Questions About This Study

No, cell phone radiation does not activate heat shock factor in mammalian cells. A 2005 study exposed hamster, mouse, and human cells to both 0.6 W/kg and 5 W/kg levels of cell phone frequencies but found no activation of this cellular stress response pathway.
Mobile phone frequencies do not trigger cellular stress response even at high 5 W/kg exposure levels. Researchers found no activation of heat shock factor, a key stress protein, in cultured mammalian cells exposed to cell phone radiation frequencies.
Researchers tested both low (0.6 W/kg) and high (5 W/kg) SAR levels for heat shock protein activation. Neither exposure level activated the heat shock factor stress response in hamster, mouse, or human cells exposed to mobile communication frequencies.
The gel shift assay could detect approximately 10% increases in heat shock factor activation after just 1 degree Celsius temperature rise. Despite this high sensitivity, no activation was detected in any mammalian cells exposed to mobile phone frequencies.
Cell phone radiation does not support the stress response cancer theory. The 2005 study found no activation of heat shock factor in exposed cells, contradicting the hypothesis that cellular stress responses contribute to cancer development from mobile phone radiation.