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Effects on protein kinase C and gene expression in a human mast cell line, HMC-1, following microwave exposure.

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Harvey C, French PW. · 2000

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Microwave radiation altered gene expression and cellular signaling in human immune cells at non-thermal exposure levels, affecting genes linked to cancer and cell death.

Plain English Summary

Summary written for general audiences

Researchers exposed human immune cells (mast cells) to microwave radiation at 864.3 MHz for 20 minutes daily over a week, using power levels that kept the cells cooler than body temperature. They found that this non-thermal exposure altered the activity of protein kinase C (a key cellular signaling molecule) and changed the expression of three genes, including one linked to cancer development and another associated with cell death.

Why This Matters

This study demonstrates that microwave radiation can trigger biological effects in human cells even when temperatures remain well below what would cause heat damage. The researchers used a SAR of 7 W/kg, which is higher than typical cell phone exposures (around 1-2 W/kg) but within ranges that can occur with some wireless devices held close to the body. What makes this research particularly significant is that it shows EMF exposure can alter fundamental cellular processes like gene expression and protein signaling pathways that control cell growth and death. The fact that a proto-oncogene (c-kit) was among the affected genes raises important questions about long-term cancer risk, while changes to apoptosis-related genes suggest EMF may interfere with the body's natural ability to eliminate damaged cells. This adds to the growing body of evidence that biological effects from wireless radiation extend far beyond simple heating.

Exposure Details

SAR
7 W/kg
Source/Device
864.3 MHz
Exposure Duration
20-min duration daily for 7 days

Exposure Context

This study used 7 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: 7 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 864.3 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 864.3 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

The aim of this study is to investigate Effects on protein kinase C and gene expression in a human mast cell line, HMC-1, following microwave exposure.

We used a resonant cavity which delivered a continuous wave exposure at 864.3 MHz at an average spec...

The temperature of the cell culture medium during the exposure fell to 26.5 degrees C. Effects were ...

We conclude that low-power microwave exposure may act on HMC-1 cells by altering gene expression via a mechanism involving activation of protein kinase C, and at temperatures well below those known to induce a heat shock response.

Cite This Study
Harvey C, French PW. (2000). Effects on protein kinase C and gene expression in a human mast cell line, HMC-1, following microwave exposure. Cell Biol Int. 2000;23(11):739-48. doi: 10.1006/cbir.1999.0436. PMID: 10736198.
Show BibTeX
@article{c_2000_effects_on_protein_kinase_1066,
  author = {Harvey C and French PW.},
  title = {Effects on protein kinase C and gene expression in a human mast cell line, HMC-1, following microwave exposure.},
  year = {2000},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/10736198/},
}
PubMed: 10736198

Cited By (56 papers)

View all 56 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, researchers found that 864.3 MHz microwave radiation altered protein signaling and gene expression in human mast cells at temperatures well below body temperature (26.5°C). The exposure changed three genes including one linked to cancer development, demonstrating non-thermal biological effects.
A 2000 study found that 864.3 MHz microwave exposure for 20 minutes daily over one week altered the expression of three genes in human mast cells, including the proto-oncogene c-kit and genes associated with cell death and metabolism.
Protein kinase C is a key cellular signaling molecule that helps control cell functions. Research showed that 864.3 MHz microwave radiation altered protein kinase C activity in human immune cells, potentially explaining how non-thermal EMF exposure affects gene expression.
Researchers found that 20-minute daily exposures to 864.3 MHz microwave radiation over one week were sufficient to alter gene expression and protein signaling in human mast cells, suggesting relatively rapid cellular responses to EMF exposure.
Out of 588 genes screened, three were affected by 864.3 MHz exposure: the cancer-linked proto-oncogene c-kit, the metabolic gene nucleoside diphosphate kinase B, and the cell death-associated gene DAD-1. Stress response genes were also variably upregulated.