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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

Radiofrequency radiation does not induce stress response in human T-lymphocytes and rat primary astrocytes.

No Effects Found

Lee JS, Huang TQ, Kim TH, Kim JY, Kim HJ, Pack JK, Seo JS. · 2006

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RF radiation at cell phone safety limits did not trigger cellular stress responses in immune and brain cells during short-term exposure.

Plain English Summary

Summary written for general audiences

Researchers exposed human immune cells and rat brain cells to cell phone-level radiofrequency radiation (1763 MHz) at power levels of 2 and 20 W/kg for up to one hour while carefully controlling temperature. They found no activation of cellular stress responses, including heat shock proteins and stress-signaling pathways that typically activate when cells are damaged. This suggests that RF radiation at these levels does not trigger the cellular alarm systems that respond to harmful stressors.

Why This Matters

This study provides important data on cellular stress responses, examining whether RF radiation triggers the same alarm bells in cells that other harmful agents do. The researchers used rigorous temperature controls to isolate non-thermal effects, testing at SAR levels of 2 W/kg (the current safety limit for cell phones) and 20 W/kg (ten times higher). The absence of stress protein activation suggests cells weren't detecting RF as a threat under these conditions. However, we should interpret these findings within the broader context of EMF research. While this study found no stress response in these specific cell types over short exposures, the scientific literature contains hundreds of studies documenting various biological effects from RF radiation, including DNA damage, oxidative stress, and neurological changes. The reality is that different cellular endpoints, exposure durations, and biological systems may respond differently to RF radiation.

Exposure Details

SAR
2 or 20 W/kg
Source/Device
763 MHz
Exposure Duration
30 min or 1 h

Exposure Context

This study used 2 or 20 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: 2 or 20 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)This level is 1 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 763 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 763 MHzPower lines50/60 HzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

In this study, we attempted to determine whether radiofrequency (RF) radiation is able to induce a non-thermal stress response.

Human T-lymphocyte Jurkat cells and rat primary astrocytes were exposed to 1763 MHz of RF radiation ...

No detectable difference was observed in the expression levels of HSP90, HSP70, and HSP27. The phosp...

These results indicate that 1763 MHz RF radiation alone did not elicit any stress response, nor did it have any effect on TPA-induced MAPK phosphorylation, under our experimental conditions.

Cite This Study
Lee JS, Huang TQ, Kim TH, Kim JY, Kim HJ, Pack JK, Seo JS. (2006). Radiofrequency radiation does not induce stress response in human T-lymphocytes and rat primary astrocytes. Bioelectromagnetics. 27(7):578-588, 2006.
Show BibTeX
@article{js_2006_radiofrequency_radiation_does_not_3189,
  author = {Lee JS and Huang TQ and Kim TH and Kim JY and Kim HJ and Pack JK and Seo JS.},
  title = {Radiofrequency radiation does not induce stress response in human T-lymphocytes and rat primary astrocytes.},
  year = {2006},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/16838270/},
}
PubMed: 16838270

Cited By (50 papers)

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Quick Questions About This Study

No, 1763 MHz radiofrequency radiation did not trigger stress responses in human T-lymphocytes or rat brain cells. The 2006 study found no activation of heat shock proteins or stress-signaling pathways even at high power levels of 20 W/kg for one hour.
Radiofrequency radiation at 1763 MHz did not activate heat shock proteins HSP70, HSP90, or HSP27 in human immune cells. Researchers found no detectable changes in expression levels even when combined with chemical stress agents like TPA.
Cell phone radiation at 1763 MHz did not enhance cellular damage from chemical stressors. When researchers combined RF exposure with TPA (a known cellular stressor), the radiation showed no additional effects on stress pathway activation in immune cells.
Rat astrocytes showed no stress response to 1763 MHz radiofrequency radiation exposure. The brain cells maintained normal stress protein levels and cellular signaling pathways, indicating no detectable cellular alarm activation from the RF radiation at tested power levels.
No MAPK signaling changes occurred from 1763 MHz radiation in human lymphocytes. The study found no significant alterations in ERK1/2, JNK1/2, or p38 phosphorylation status, indicating normal cellular communication pathways despite RF exposure up to 20 W/kg.