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[Effects of different dose microwave radiation on protein components of cultured rabbit lens]

Wang KJ, Yao K, Lu DQ. · 2007

Studying gene expression profile of rat neuron exposed to 1800MHz radiofrequency electromagnetic fields with cDNA microassay.

Zhao R, Zhang S, Xu Z, Ju L, Lu D, Yao G. · 2007

Researchers investigated whether 1800 MHz radiofrequency electromagnetic fields could influence gene expression in rat neurons. Among 1200 candidate genes, 24 were up-regulated and 10 were down-regulated after 24 hours of intermittent exposure at a SAR of 2 W/kg. The researchers concluded that gene expression in rat neurons could be altered by exposure to radiofrequency electromagnetic fields under their experimental conditions.

Effect of an acute 900 MHz GSM exposure on glia in the rat brain: A time-dependent study

Brillaud E, Piotrowski A, de Seze R · 2007

Researchers measured GFAP expression in rat brains 2, 3, 6, and 10 days after a single 15-minute 900 MHz GSM exposure at a brain averaged SAR of 6 W/kg. A statistically significant increase in GFAP stained surface area was observed 2 days after exposure in the frontal cortex and the caudate putamen. A smaller statistically significant increase was noted 3 days after exposure in those same areas and in the cerebellum cortex. The researchers concluded this was a temporary effect, probably due to a hypertrophy of glial cells, and noted that whether the effect could be harmful remains to be studied.

Mobile phone 'talk-mode' signal delays EEG-determined sleep onset.

Hung CS, Anderson C, Horne JA, McEvoy P · 2007

Researchers exposed 10 healthy young adults to talk, listen, standby, or sham signal modes for 30 minutes, then gave them a 90-minute sleep opportunity. Sleep latency after talk mode was markedly and significantly delayed beyond listen and sham modes. This condition effect was also evident in 1–4 Hz EEG frontal power, a frequency range described as particularly sensitive to sleep onset. There was no condition effect for subjective sleepiness.

Mobile phone radiation and the developing brain: behavioral and morphological effects in juvenile rats.

Kumlin T et al. · 2007

Researchers exposed young male Wistar rats to a 900 MHz mobile phone signal for 2 h/day on 5 days/week. After 5 weeks of exposure at whole-body average specific energy absorption rates of 0.3 or 3.0 W/kg or sham exposure, rats were assessed for behavioral and morphological changes. No degenerative changes, dying neurons, or effects on blood-brain barrier leakage were detected, and no group differences appeared in the open-field, plus maze, or acoustic startle response tests. In the water maze test, significantly improved learning and memory were detected in rats exposed to RF fields.

Effects of 900-MHz electromagnetic field emitted from cellular phone on brain oxidative stress and some vitamin levels of guinea pigs.

Meral I et al. · 2007

In brain tissue, the MDA level increased and GSH level and CAT enzyme activity decreased in EMF-exposed guinea pigs, while vitamins A, E, and D3 levels did not change. In blood, MDA, vitamins A, D3, and E levels, and CAT enzyme activity increased, while GSH level decreased in the EMF-exposed guinea pigs.

Mobile phone ‘talk-mode’ signal delays EEG-determined sleep onset.

Hung CS, Anderson C, Horne JA, McEvoy P. · 2007

Researchers exposed sleep-deprived people to mobile phone signals for 30 minutes, then monitored their brain waves during sleep. Active phone transmissions during "talk mode" significantly delayed deep sleep onset compared to other phone modes, suggesting cell phone use can disrupt natural sleep patterns.

Exposure to radiofrequency radiation induces oxidative stress in duckweed Lemna minor L.

Tkalec M, Malarić K, Pevalek-Kozlina B. · 2007

Researchers exposed duckweed (Lemna minor) to radiofrequency electromagnetic fields at 400 and 900 MHz, at field strengths of 10, 23, 41, and 120 V m−1, for 2 hours, and also tested a longer 4-hour exposure and modulated fields. After exposure, the researchers measured lipid peroxidation, H2O2 content, antioxidative enzyme activities and isoenzyme patterns, and HSP70 expression. At 900 MHz, almost all exposure treatments significantly increased lipid peroxidation and H2O2 content, mostly decreased PPX activity, and did not affect CAT activity. No differences in isoenzyme patterns of antioxidative enzymes or HSP70 level were found between control and exposed plants at either frequency.

Evaluating the combinative effects on human lymphocyte DNA damage induced by ultraviolet ray C plus 1.8GHz microwaves using comet assay in vitro.

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.

Effect of whole-body exposure to high-frequency electromagnetic field on the brain cortical and hippocampal activity in mouse experimental model

Barcal J, Vozeh F · 2007

ECoG evaluation showed a distinct shift to lower frequency components in wild type mice but only gentle differences in Lurcher mutant mice. Hippocampal rhythmicity showed gentle changes with increase of higher frequencies and changes in theta oscillations in both healthy and mutant mice.

Exposure to cell phone radiation up-regulates apoptosis genes in primary cultures of neurons and astrocytes

Zhao TY, Zou SP, Knapp PE. · 2007

Researchers exposed primary cultured neurons and astrocytes to GSM cell phone emissions at 1900 MHz for 2 hours. Neurons showed up-regulation of caspase-2, caspase-6, and Asc genes in both 'on' and 'stand-by' modes. Astrocytes showed up-regulation of the same genes only in 'on' mode and also up-regulated the Bax gene.

Effect of whole-body exposure to high-frequency electromagnetic field on the brain cortical and hippocampal activity in mouse experimental model.

Barcal J, Vozeh F. · 2007

Researchers measured brain activity in mice while exposing them to 900 MHz radiofrequency radiation (the same frequency used by cell phones). They found that this exposure caused measurable changes in brain wave patterns in both the cortex and hippocampus - key brain regions involved in thinking and memory. The changes were most pronounced in healthy mice, suggesting that cell phone-frequency radiation can directly alter normal brain function.

Genotoxic effects of exposure to radiofrequency electromagnetic fields (RF-EMF) in cultured mammalian cells are not independently reproducible.

Speit G, Schütz P, Hoffmann H. · 2007

Researchers exposed ES1 cells to 1800 MHz RF-EMF at 2 W/kg SAR with intermittent exposure and tested for DNA damage using the alkaline comet assay and micronucleus test. They also tested V79 Chinese hamster cells and found no genotoxic effect in either assay. Quality control measures were used to rule out test performance issues, exposure failure, or evaluation bias.

Effects of subchronic exposure to a 1439 MHz electromagnetic field on the microcirculatory parameters in rat brain.

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.

Effects of electromagnetic radiation from a cellular phone on human sperm motility: an in vitro study.

Erogul O et al. · 2006

Researchers enrolled 27 men and divided each semen sample into two parts, exposing one to 900 MHz cellular phone radiation. Exposure caused a subtle decrease in rapid and slow progressive sperm movement and an increase in non-motile sperm. Sperm concentration did not differ significantly between exposed and unexposed samples.

Exposure of rat brain to 915 MHz GSM microwaves induces changes in gene expression but not double stranded DNA breaks or effects on chromatin conformation.

Belyaev IY et al. · 2006

Researchers exposed rats to 915 MHz GSM microwaves for 2 hours at a SAR of 0.4 mW/g and then examined brain cells for DNA damage and gene expression changes. In the cerebellum, 11 genes were upregulated in a range of 1.34 to 2.74 fold and one gene was downregulated 0.48-fold (P < .0025). The exposure did not induce detectable DNA double strand breaks or changes in chromatin conformation.

Exposure of rat brain to 915 MHz GSM microwaves induces changes in gene expression but not double stranded DNA breaks or effects on chromatin conformation.

Belyaev IY et al. · 2006

Scientists exposed rats to cell phone radiation at 915 MHz for 2 hours and found it changed gene activity in the brain without causing DNA breaks. The radiation altered the expression of 12 genes involved in brain functions like neurotransmitter regulation, the blood-brain barrier, and melatonin production. This suggests that even brief cell phone exposure can trigger biological changes in brain cells, even when DNA damage isn't detectable.

Protective effects of melatonin and caffeic acid phenethyl ester against retinal oxidative stress in long-term use of mobile phone: A comparative study.

Ozguner F, Bardak Y, Comlekci S. · 2006

Researchers compared how well melatonin and caffeic acid phenethyl ester (CAPE) protected rat retinas from oxidative stress caused by exposure to 900 MHz mobile-phone radiation. Melatonin and CAPE were administered daily for 60 days to the rats prior to their EMR exposure. Retinal levels of the oxidative stress markers NO and MDA increased in EMR-exposed rats, while both melatonin and CAPE caused a significant reduction in those levels. Antioxidant enzyme activities (SOD, GSH-Px, and CAT) decreased in EMR-exposed animals, but both treatments significantly increased those activities.

Protective effects of melatonin and caffeic acid phenethyl ester against retinal oxidative stress in long-term use of mobile phone: A comparative study.

Ozguner F, Bardak Y, Comlekci S · 2006

Researchers exposed rats to 900 MHz mobile phone radiation (the same frequency used by many cell phones) for 60 days and found it caused significant oxidative stress in eye tissue. The radiation increased harmful compounds and decreased protective antioxidant enzymes in the retina. However, rats given melatonin or caffeic acid supplements before exposure were largely protected from this damage, suggesting these antioxidants might help shield eye tissue from cell phone radiation effects.

Mobile phone radiation causes changes in gene and protein expression in human endothelial cell lines and the response seems to be genome- and proteome-dependent.

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.

Mobile phone radiation causes changes in gene and protein expression in human endothelial cell lines and the response seems to be genome- and proteome-dependent.

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.

Endometrial Apoptosis Induced by a 900-MHz Mobile Phone: Preventive Effects of Vitamins E and C.

Oral B et al. · 2006

Researchers examined oxidative stress from a 900-MHz mobile phone and the possible protective effects of vitamins E and C on endometrial tissue in rats. Rats were divided into a sham control group, a 900-MHz EMF-exposed group (30 minutes daily for 30 days), and an EMF-exposed group treated with vitamins E and C before each exposure. Malondialdehyde, a marker of lipid peroxidation, and the proteins Bcl-2, Bax, caspase-3, and caspase-8 were measured in endometrial tissue. The EMF-exposed rats showed increased malondialdehyde levels and apoptosis, while vitamins E and C ameliorated oxidative tissue injury and apoptosis through free radical scavenging and antioxidant properties.

Endometrial Apoptosis Induced by a 900-MHz Mobile Phone: Preventive Effects of Vitamins E and C.

Oral B et al. · 2006

Turkish researchers exposed female rats to 900-MHz radiation (similar to older cell phones) for 30 minutes daily over 30 days and found it caused cell death and oxidative damage in the endometrium, the tissue lining the uterus. However, when rats were given vitamins E and C before exposure, these protective antioxidants significantly reduced the harmful effects. This suggests that cell phone radiation may damage reproductive tissues through oxidative stress, but antioxidants might offer some protection.

Characterization of the electromagnetic near-field absorption in layered biological tissue in the frequency range from 30 MHz to 6000 MHz Phys.

Christ A, Samaras T, Klingenböck A, Kuster N. · 2006

The study investigated electromagnetic near-field absorption in layered biological tissue from 30 MHz to 6000 MHz. Two effects can increase SAR in layered tissue versus homogeneous liquid: standing wave effects at larger distances depending on frequency and fat thickness, and high local skin absorption from reactive E-fields in the very close near-field. A conservative exposure estimate can be obtained by applying a multiplication factor of 1 to 3 to current dosimetric values.

ROS release and Hsp70 expression after exposure to 1,800 MHz radiofrequency electromagnetic fields in three model cell lines.

Unknown authors · 2006

PMA treatment significantly increased ROS production in both cell types compared to sham or incubator controls. GSM-DTX exposure showed significantly different ROS production in monocytes compared to sham, but this was due to lowered ROS release during sham exposure. No ROS differences were detected in lymphocytes compared to sham or incubator control. Hsp70 expression in monocytes at 0, 1, and 2 hours post-exposure to GSM-DTX at 2 W/kg for 1 hour did not differ from incubator or sham controls.