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Exposure to 835 MHz radiofrequency electromagnetic field induces autophagy in hippocampus but not in brain stem of mice.

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Kim JH, Yu DH, Kim HJ, Huh YH, Cho SW, Lee JK, Kim HG, Kim HR. · 2017

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Cell phone radiation triggered cellular stress responses in the brain's memory center at twice current safety limits.

Plain English Summary

Summary written for general audiences

Researchers exposed mice to cell phone radiation (835 MHz) for 12 weeks and found it triggered cellular changes specifically in the hippocampus, the brain region controlling memory and learning. The brainstem remained unaffected, suggesting some brain areas are more vulnerable to radiofrequency exposure than others.

Why This Matters

This study adds important evidence to our understanding of how radiofrequency radiation affects the brain at the cellular level. The researchers used an SAR of 4.0 W/kg, which is twice the current FCC safety limit of 1.6 W/kg for cell phones in the US. What's particularly significant is that the effects were region-specific, occurring only in the hippocampus, which is crucial for memory formation and learning. The fact that autophagy was triggered suggests the brain cells were responding to stress from the RF exposure. While autophagy can be protective in the short term, chronic activation may indicate ongoing cellular damage. The science demonstrates that RF radiation isn't biologically inert as wireless industry claims suggest, and the hippocampus appears to be a particularly vulnerable target.

Exposure Details

SAR
4 W/kg
Source/Device
835 MHz
Exposure Duration
12 weeks

Exposure Context

This study used 4 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: 4 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 835 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 835 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

In the present study, we explored whether autophagy is triggered in the hippocampus or brain stem after RF-EMF exposure.

C57BL/6 mice were exposed to 835 MHz RF-EMF with specific absorption rates (SAR) of 4.0 W/kg for 12 ...

Quantitative real-time polymerase chain reaction (qRT-PCR) analysis demonstrated that several autoph...

These results could suggest that among the various adaptation processes to the RF-EMF exposure environment, autophagic degradation is one possible mechanism in specific brain regions.

Cite This Study
Kim JH, Yu DH, Kim HJ, Huh YH, Cho SW, Lee JK, Kim HG, Kim HR. (2017). Exposure to 835 MHz radiofrequency electromagnetic field induces autophagy in hippocampus but not in brain stem of mice. Toxicol Ind Health. 2017 Jan 1:748233717740066. doi: 10.1177/0748233717740066.
Show BibTeX
@article{jh_2017_exposure_to_835_mhz_1103,
  author = {Kim JH and Yu DH and Kim HJ and Huh YH and Cho SW and Lee JK and Kim HG and Kim HR.},
  title = {Exposure to 835 MHz radiofrequency electromagnetic field induces autophagy in hippocampus but not in brain stem of mice.},
  year = {2017},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/29166827/},
}
PubMed: 29166827

Cited By (26 papers)

Quick Questions About This Study

Yes, researchers found that 835 MHz radiofrequency radiation triggered autophagy (cellular cleanup process) in mouse hippocampus after 12 weeks of exposure. This suggests cell phone frequencies can activate specific cellular responses in memory-related brain regions, though the brainstem remained unaffected.
The 2017 study showed that 835 MHz radiation at 4.0 W/kg specifically triggered autophagy in the hippocampus while leaving the brainstem unchanged. This indicates certain brain regions may be more vulnerable to radiofrequency exposure than others, possibly due to structural differences.
Exposure to 835 MHz radiation increased autophagic genes, LC3B-II proteins, and p62 levels specifically in the hippocampus. Researchers also observed more autophagosomes and autolysosomes in hippocampal neurons, indicating enhanced cellular cleanup activity in this memory-critical brain region.
Yes, 12 weeks of 835 MHz exposure significantly changed crucial autophagy proteins LC3B-II and p62 in mouse hippocampus. The study found these protein changes occurred alongside increased autophagic gene expression, suggesting prolonged radiofrequency exposure can modify brain protein function.
Research indicates that 835 MHz radiation at 4.0 W/kg SAR triggers autophagy as a potential brain adaptation mechanism. The study suggests this cellular cleanup process may represent how specific brain regions like the hippocampus respond to radiofrequency electromagnetic field exposure environments.