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

Cellular Effects

Mobile phone base station‐emitted radiation does not induce phosphorylation of Hsp27

No Effects Found

Hirose H, Sakuma N, Kaji N, Nakayama K, Inoue K, Sekijima M, Nojima T, Miyakoshi J. · 2007

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Cell phone tower radiation up to 10 times public limits didn't trigger cellular stress proteins in lab studies.

Plain English Summary

Summary written for general audiences

Researchers exposed human brain and lung cells to cell phone tower radiation at levels up to 10 times higher than public safety limits to test whether it triggers heat shock proteins (cellular stress markers). After continuous exposure for up to 48 hours, they found no increase in these stress proteins compared to unexposed cells. This suggests that cell phone tower radiation at these levels doesn't cause detectable cellular stress responses.

Why This Matters

This study provides important data on cellular stress responses at the specific frequency used by many modern cell networks (2.1425 GHz). The researchers tested exposures up to 800 mW/kg, which is 10 times higher than the 80 mW/kg public exposure limit set by international guidelines. Heat shock proteins are well-established markers of cellular stress, so their absence suggests these RF levels don't trigger obvious stress pathways in these cell types. However, this represents just one biological endpoint in two cell lines. The science demonstrates that EMF effects can be highly specific to frequency, modulation, cell type, and exposure conditions. What this means for you is that while this study found no stress protein activation, it doesn't rule out other potential biological effects from cell tower radiation, and the research landscape on EMF health effects remains complex and evolving.

Exposure Details

SAR
0.08, 0.25, 0.8 W/kg
Source/Device
2.1425 GHz
Exposure Duration
continuous for 2, 24, or 48 h for A172 cells,2 or 28 h for IMR-90 cells,24 or 48 h for A172 cells and 28 h for IMR-90 cells

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.08, 0.25, 0.8 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Severe Concern range (Building Biology)FCC limit is 20 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.14 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.14 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

An in vitro study focusing on the effects of low‐level radiofrequency (RF) fields from mobile radio base stations employing the International Mobile Telecommunication 2000 (IMT‐2000) cellular system was conducted to test the hypothesis that modulated RF fields act to induce phosphorylation and overexpression of heat shock protein hsp27.

First, we evaluated the responses of human cells to microwave exposure at a specific absorption rate...

Under the RF field exposure conditions described above, no significant differences in the expression...

Our results confirm that exposure to low‐level RF field up to 800 mW/kg does not induce phosphorylation of hsp27 or expression of hsp gene family.

Cite This Study
Hirose H, Sakuma N, Kaji N, Nakayama K, Inoue K, Sekijima M, Nojima T, Miyakoshi J. (2007). Mobile phone base station‐emitted radiation does not induce phosphorylation of Hsp27 Bioelectromagnetics. 28(2):99-108, 2007.
Show BibTeX
@article{h_2007_mobile_phone_base_stationemitted_2762,
  author = {Hirose H and Sakuma N and Kaji N and Nakayama K and Inoue K and Sekijima M and Nojima T and Miyakoshi J.},
  title = {Mobile phone base station‐emitted radiation does not induce phosphorylation of Hsp27},
  year = {2007},
  doi = {10.1002/bem.20277},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/bem.20277},
}
DOI: 10.1002/bem.20277

Cited By (40 papers)

Quick Questions About This Study

A 2007 study found no evidence that cell phone tower radiation causes cellular stress. Researchers exposed human brain and lung cells to radiation levels up to 10 times higher than safety limits for 48 hours without triggering stress proteins that indicate cellular damage.
Research testing human brain cells exposed to cell tower radiation at high levels found no harmful cellular effects. The study measured stress proteins that indicate cell damage and found no increase compared to unexposed cells after continuous exposure.
A controlled in vitro study exposed human cells to W-CDMA cell tower signals at 2.1425 GHz and found no detectable cellular stress responses. Even at radiation levels 10 times higher than public safety limits, cells showed no increase in stress proteins or gene expression changes.
Laboratory research found no cellular stress risks from cell phone tower radiation at levels up to 800 mW/kg. Human brain and lung cells showed no activation of heat shock proteins, which are key indicators of cellular damage or stress.
A 2007 study found cell tower radiation doesn't impact normal cell function at tested levels. Researchers measured cellular stress markers in human brain and lung cells after 48-hour exposure and detected no significant changes in cellular responses.