RF-039Original text reviewed

Cell-specific γH2AX response with no sustained functional injury

Xu et al. · 2013 · PLoS ONE

The reported finding

After 24 h, γH2AX foci increased in Chinese hamster lung and human skin fibroblasts, but not four other cell types. Comet, TUNEL, proliferation and viability did not show corresponding sustained abnormalities in fibroblasts.

Reading it carefully

γH2AX marks DNA-damage signalling; it does not establish irreversible strand breakage or clinical injury. Multiple assays and small replicate counts; downstream functional effects were largely absent.

Inside the study

Exposure conditions

1,800 MHz GSM-like 217 Hz modulation; cell-monolayer SAR 3.0 W/kg for 1 or 24 h, 5 min on/10 min off. Dual R18 waveguides; sham isolation >60 dB; medium-specific dosimetry; air 37±0.1°C and culture temperature rise <0.1°C.

Design & controls

Six cell types; blinded exposure and assay teams; approximately 200 cells/sample; at least four independent experiments for foci; 4NQO positive controls. Orthogonal DNA-damage and functional assays in human skin fibroblasts.

Statistics

Mean foci/cell: CHL 4.30±0.37 versus 3.10±0.30, P=.022; fibroblasts 6.21±0.44 versus 4.54±0.22, P=.011. A small cell-cycle shift at 6 h was absent at 12 h; ROS increase was nonsignificant.

Related research & shared cohorts

Zhejiang University/IT'IS study, distinct from Vienna REFLEX RF-016. ETH repository DOI 10.3929/ethz-b-000064177 is a version of the same work.

The protection question raised

When does DNA-damage signalling indicate lasting injury? The lack of corresponding sustained abnormalities in other assays makes this a cell-specific response question rather than an established genotoxic disease mechanism.

Source verification

Original full methods, results and supplemental descriptions reviewed through PMC XML; Scite abstract and metadata corroborated.

Where to find the result

Exposure System; Cell Exposure Protocol; Figure 1; Figures 2-6; Figure S1; Funding Statement.

Editorial notices

No editorial notice surfaced in the Scite/primary-record checks used for this record; this is not a comprehensive clean-bill certification.

Funding

Chinese Ministry of Science and Technology 2011CB503702; NSFC 81102094/30872082; Zhejiang 5Y205458; doctoral and central-university grants; author career awards. Funders reported no role.

Conflicts of interest

Authors declare no competing interests. IT'IS/Zurich dosimetry coauthors participated.

Original publication

Shanshan Xu; Guangdi Chen; Chunjing Chen; Chuan Sun; Danying Zhang; Manuel Murbach; Niels Kuster; Qunli Zeng; Zhengping Xu. Cell Type-Dependent Induction of DNA Damage by 1800 MHz Radiofrequency Electromagnetic Fields Does Not Result in Significant Cellular Dysfunctions. PLoS ONE. 2013;8(1):e54906. doi:10.1371/journal.pone.0054906.

Plain-text record