Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.
Sekijima M, Takeda H, Yasunaga K, Sakuma N, Hirose H, Nojima T, Miyakoshi J. 2- GHz band CW and W-CDMA modulated radiofrequency fields have no significant effect on cell proliferation and gene expression profile in human cells
No Effects Found
Authors not listed · 2010
96-hour exposure to 3G cell phone frequencies showed no cellular damage in laboratory conditions.
Plain English Summary
Summary written for general audiences
Japanese researchers exposed human brain and lung cells to 2.1 GHz radiofrequency radiation (similar to 3G cell phone signals) for up to 96 hours at various power levels. They found no significant effects on cell growth, survival, or gene expression patterns. The study suggests that RF exposure within international safety guidelines doesn't trigger cellular stress responses in laboratory conditions.
Exposure Information
Cite This Study
Unknown (2010). Sekijima M, Takeda H, Yasunaga K, Sakuma N, Hirose H, Nojima T, Miyakoshi J. 2- GHz band CW and W-CDMA modulated radiofrequency fields have no significant effect on cell proliferation and gene expression profile in human cells.
Show BibTeX
@article{sekijima_m_takeda_h_yasunaga_k_sakuma_n_hirose_h_nojima_t_miyakoshi_j_2_ghz_band_cw_and_w_cdma_modulated_radiofrequency_fields_have_no_significant_effect_on_cell_proliferation_and_gene_expression_prof_ce3017,
author = {Unknown},
title = {Sekijima M, Takeda H, Yasunaga K, Sakuma N, Hirose H, Nojima T, Miyakoshi J. 2- GHz band CW and W-CDMA modulated radiofrequency fields have no significant effect on cell proliferation and gene expression profile in human cells},
year = {2010},
doi = {10.1269/JRR.09126},
}Quick Questions About This Study
No significant effects on cell proliferation or viability were observed in human brain and lung cells exposed to 2.1 GHz W-CDMA radiation for up to 96 hours, even at high SAR levels of 800 mW/kg.
Less than 1% of genes showed altered expression in human cells exposed to 2.1 GHz radiation. This minimal change was not considered biologically significant and fell within normal cellular variation ranges.
Researchers tested three specific absorption rates: 80, 250, and 800 mW/kg. The highest level (800 mW/kg) approaches but remains below typical cell phone SAR limits of 1.6-2.0 W/kg.
No differences were found between continuous wave (CW) and W-CDMA modulated signals at 2.1 GHz. Both signal types produced essentially identical results across all tested parameters in human cells.
Three human cell lines were studied: A172 glioblastoma (brain cancer cells), H4 neuroglioma (brain tumor cells), and IMR-90 fibroblasts (normal fetal lung cells). All showed similar resistance to RF effects.