Moisescu MG, Leveque P, Bertrand JR, Kovacs E, Mir LM · 2008
Researchers designed a device for continuous microscopic observation of cells exposed to modulated EMF similar to mobile phone signals. The system allowed follow-up of cell progression into mitosis under controlled temperature and CO2 environment. Cells exposed to 900 MHz modulated EMF for 1 hour at 30 degrees C and 2.2 W/kg showed increased endocytosis rate but no alteration in mitosis progression or duration. The exposure system was validated by cell endocytosis measurements.
Zeni O et al. · 2008
Masuda H et al. · 2007
Researchers exposed the heads of rats for four weeks (60 min/day, 5 days/week) to RF-EMF at 2.4 W/kg of brain averaged specific absorption rate (BASAR). They measured blood-brain barrier permeability, leukocyte behavior, and plasma velocity using a closed cranial window method. No extravasation of dyes from pial venules was found, no significant changes in endothelial-adhering leukocytes occurred, and plasma velocity remained constant within the physiological range. These findings suggest that there were no effects on the cerebral microcirculation under the given RF-EMF exposure conditions.
Xu S, Ning W, Xu Z, Zhou S, Chiang H, Luo J. · 2006
The study assessed the effects of microwave exposure on cultured rat hippocampal neurons using whole cell patch-clamp analysis combined with immunocytochemistry. Chronic exposure for 15 minutes per day over 8 days to GSM 1800-MHz microwaves at a SAR of 2.4 W/kg selectively reduced the amplitude of AMPA miniature excitatory postsynaptic currents, while the frequency of AMPA mEPSCs and the amplitude of NMDA mEPSCs did not change. The same exposure decreased the expression of postsynaptic density 95 (PSD95) in the cultured neurons.
Billaudel B, Taxile M, Ruffie G, Veyret B, Lagroye I. · 2009
Researchers exposed murine L-929 fibroblasts to DAMPS and GSM signals at various SARs using different exposure set-ups and measured ODC activity via 14CO2 generation from 14C-labeled L-ornithine. Exposure to 50 Hz-modulated DAMPS-835 at 2.5 W/kg for one hour in TEM cells and at 6 W/kg with temperature control showed no significant alteration in ODC activity. In the second part, no alteration of ODC activity was detected with 217 Hz modulated GSM-900 (wire-patch antenna) or GSM-1800 (waveguides) when cells were lysed before measurement. The researchers concluded that under their exposure conditions, DAMPS-835 and GSM signals have no influence on ODC activity in L-929 cells.
Sanchez S et al. · 2008
Researchers investigated heat shock protein expression in hairless rat skin exposed to GSM-900 and GSM-1800 signals. They studied Hsc70, Hsp25, and Hsp70 using immunolabeling of epidermal skin slices. Single exposures were 2 hours at 0 and 5 W/kg; repeated exposures were 2 hours per day, 5 days per week for 12 weeks at 0, 2.5, and 5 W/kg. Neither single nor repeated exposures altered HSP expression regardless of GSM signal or SAR.
Sanchez S et al. · 2006
Researchers exposed five-week-old female hairless rats to GSM-900 or -1800 signals for 2 hours per day, 5 days a week, for 12 weeks. Skin thickness showed no significant difference between exposed and sham-exposed groups. Cellular proliferation measured by Ki-67 remained within normal range in exposed epidermis. Levels of filaggrin, collagen, and elastin did not differ significantly among groups.
Penafiel LM, Litovitz T, Krause D, Desta A, Mullins JM · 1997
Litovitz TA, Krause D, Penafiel M, Elson EC, Mullins JM, · 1993
The study investigated the role of coherence time in the effect of microwaves on ornithine decarboxylase activity. Amplitude-modulated 915 MHz microwaves at SAR 2.5 W/kg modulated at 55, 60, or 65 Hz approximately doubled ornithine decarboxylase activity after 8 h, and switching modulation frequencies at coherence times of 1.0 s or less abolished the enhancement while times of 10 s or longer provided full enhancement.
Stan Neuder · 1979
Nylund R, Leszczynski D · 2006
Finnish researchers exposed human blood vessel cells to mobile phone radiation for one hour and found that genes and proteins changed differently in each cell type. This suggests that cellular response to phone radiation depends on the specific genetic makeup of cells, potentially explaining conflicting research results.
Nylund R, Leszczynski D. · 2006
Researchers examined in vitro cell response to mobile phone radiation using two variants of a human endothelial cell line: EA.hy926 and EA.hy926v1. Gene expression changes were examined using cDNA Expression Arrays and protein expression changes were examined using 2-DE and PDQuest software. Gene and protein expression were altered in both examined cell lines after one hour of exposure at an average specific absorption rate of 2.8 W/kg, but the same genes and proteins were differently affected in each line.
Lameth J et al. · 2017
Researchers investigated whether a 2-hour head-only exposure to GSM-1800 MHz could affect a neuroinflammatory reaction triggered by lipopolysaccharide in 2-week-old or adult rats. In developing rats, 24 hours after exposure, cortical interleukin-1β and NOX2 NADPH oxidase transcripts were reduced by 50 to 60% compared with sham-exposed animals. Adult rats showed a 50% reduction in IL1β mRNA but no NOX2 suppression and displayed a significant growth response of microglial cell processes. GSM exposure decreased phosphorylation at two residues on the GluA1 AMPA receptor subunit (serine 831 and 845). The changes in gene expression, microglia, and GluA1 phosphorylation did not persist 72 hours after exposure and were absent without LPS pretreatment.
Mazor R et al. · 2008
Researchers exposed human blood cells to 800 MHz radiofrequency radiation (similar to cell phone frequencies) for 72 hours at power levels close to current safety limits. They found significant increases in chromosome damage called aneuploidy, where cells gained or lost whole chromosomes. Importantly, this damage occurred even when temperature was carefully controlled, suggesting the radiation itself caused genetic harm through non-thermal mechanisms.
Mazor R et al. · 2008
Researchers exposed human peripheral blood lymphocytes from 10 samples to radiofrequency electromagnetic fields at 800 MHz for 72 hours in a waveguide resonator at specific absorption rates of 2.9 and 4.1 W/kg. The study found increased levels of aneuploidy depending on the chromosome studied and the level of exposure, with chromosomal gains appearing to be the primary contributor. Temperature was tested over a range of 33.5–40°C for 72 hours and showed no statistically significant difference in aneuploidy levels compared to 37°C, suggesting the effect may not be due to heating.
Zhang KY et al. · 2017
Researchers exposed mouse spermatocyte-derived GC-1 cells to a 1950 MHz RF field at 3 W/kg SAR for 24 hours with or without 6 Gy X-ray irradiation. RF exposure alone did not change cell proliferation or apoptosis levels. When combined with X-ray, RF exposure significantly decreased proliferation and increased apoptotic rate compared to X-ray alone. The combined exposure also significantly decreased Bcl-2 protein expression and increased Bax protein expression.
Wang D et al. · 2015
Exposure significantly reduced progressive sperm motility and viability and increased sperm head defects. Early apoptosis was higher after exposure, while DNA methylation of the H19 ICR and KvDMR1 imprinting genes did not change significantly.
Xu S et al. · 2013
Baohong W et al. · 2007
Researchers exposed human lymphocytes to 1.8 GHz microwaves at a SAR of 3 W/kg, ultraviolet ray C (UVC), or both, then measured DNA damage using the comet assay. Microwave exposure alone did not produce significantly more DNA damage than the control group. When combined with UVC, microwave exposure was associated with reduced DNA damage at 1.5-hour incubation but increased DNA damage at 4-hour incubation, compared with UVC alone.
Zhang DY, Xu ZP, Chiang H, Lu DQ, Zeng QL. · 2006
Chinese researchers exposed hamster lung cells to cell phone radiation at 1800 MHz (the frequency used by GSM networks) for either 1 or 24 hours to see if it would damage DNA. They found that 24-hour exposure at high intensity (3.0 W/kg) significantly increased DNA damage markers compared to unexposed cells, while 1-hour exposure showed no effect. This suggests that prolonged exposure to cell phone-type radiation may harm cellular DNA.
Zhang DY, Xu ZP, Chiang H, Lu DQ, Zeng QL. · 2006
Researchers exposed hamster lung cells to 1800 MHz radiation from GSM cell phones for 1 or 24 hours. Twenty-four hour exposure significantly increased DNA damage in 37.9% of cells versus 28.0% in unexposed cells, showing duration matters for cellular harm.
Zhang DY, Xu ZP, Chiang H, Lu DQ, Zeng QL. · 2006
Researchers studied the effects of GSM 1800 MHz radiofrequency electromagnetic fields on DNA damage in Chinese hamster lung cells. Cells were intermittently exposed to GSM 1800 MHz RF EMF at a SAR of 3.0 W/kg for either 1 hour or 24 hours, using a pattern of 5 minutes on and 10 minutes off. After 24 hours of exposure, the percentage of gammaH2AX foci positive cells was 37.9 +/- 8.6%, significantly higher than the sham-exposed group at 28.0 +/- 8.4%. The 1-hour exposure showed no significant difference from sham exposure.
Thorlin et al. · 2006
Researchers exposed cultured astroglial and microglial cells to 900 MHz microwave radiation at various SARs and durations. They measured markers including interleukin 6, tumor necrosis factor-alpha, glial fibrillary acidic protein, total protein, and ED-1. No significant differences were found for any parameter at any time or radiation characteristic. Total protein levels remained constant and cell morphology appeared unaffected. The study concluded no evidence for effects on damage-related factors in glial cells.
Baohong Wang et al. · 2005
Researchers studied whether 1.8 GHz radiofrequency field radiation (RFR) at a SAR of 3 W/kg could interact with four chemical mutagens to damage DNA in human lymphocytes in vitro. DNA damage was detected using comet assay at two incubation times after treatment. RFR alone showed no difference in DNA damage compared to the control group, but co-exposure with MMC or 4NQO produced significantly greater DNA damage than those chemicals alone. Co-exposure with bleomycin or methyl methanesulfonate did not significantly increase DNA damage compared with those chemicals alone.
Baohong Wang et al. · 2005
Researchers exposed human immune cells to 1.8 GHz cell phone radiation (the same frequency used by many mobile phones) for 2-3 hours to see if it damages DNA. While the radiation alone didn't harm DNA, it significantly amplified the damage when cells were also exposed to certain toxic chemicals. This suggests cell phone radiation may make our cells more vulnerable to other environmental toxins.
