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

DNA & Genetic Damage

NF-kappaB or AP-1- dependent reporter gene expression is not altered in human U937 cells exposed to power- line frequency magnetic fields

No Effects Found

Authors not listed · 1999

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60 Hz magnetic fields up to 1300 times stronger than household levels failed to activate key cellular stress pathways in human immune cells.

Plain English Summary

Summary written for general audiences

Researchers exposed human leukemia cells to 60 Hz power-line frequency magnetic fields at various intensities to see if they would activate key cellular signaling pathways called NF-kappaB and AP-1. Despite testing multiple field strengths up to 1.3 mT, they found no changes in these important cellular communication systems that regulate gene expression and immune responses.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 60 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale
Cite This Study
Unknown (1999). NF-kappaB or AP-1- dependent reporter gene expression is not altered in human U937 cells exposed to power- line frequency magnetic fields.
Show BibTeX
@article{nf_kappab_or_ap_1_dependent_reporter_gene_expression_is_not_altered_in_human_u937_cells_exposed_to_power_line_frequency_magnetic_fields_ce4149,
  author = {Unknown},
  title = {NF-kappaB or AP-1- dependent reporter gene expression is not altered in human U937 cells exposed to power- line frequency magnetic fields},
  year = {1999},
  
  
}
PubMed: 10073669

Quick Questions About This Study

No, this study found that 60 Hz magnetic fields at intensities up to 1.3 mT did not activate NF-kappaB signaling pathways in human leukemia cells, despite testing multiple field strengths over extended periods.
Researchers tested magnetic field intensities of 0.08, 0.1, 1.0, and 1.3 mT (millitesla) on human U937 leukemia cells. These levels are hundreds to thousands of times stronger than typical household EMF exposure.
No, exposure to 60 Hz magnetic fields did not activate the AP-1 transcription factor pathway in this study, even at field strengths far exceeding those found near power lines or household appliances.
Scientists used reporter gene technology, introducing genes that produce detectable proteins when specific pathways activate. They measured chloramphenicol acetyltransferase (CAT) protein levels using specialized laboratory assays to track pathway activity.
These pathways control how cells respond to stress and regulate gene expression. If EMF could activate them, it might explain potential health effects. Their lack of response suggests 60 Hz fields don't trigger fundamental cellular stress mechanisms.