Kumar S, Kesari KK, Behari J. · 2011
Researchers exposed male Wistar rats to a 2.45 GHz microwave field for two hours per day over 60 days. They also applied a 100 Hz pulsed electromagnetic field to some groups, either alone or combined with the microwave exposure. Microwave exposure significantly increased caspase and creatine kinase levels and decreased testosterone and melatonin. Pulsed electromagnetic field exposure relieves the effect of microwave exposure by inducing Faraday currents.
Imai N, Kawabe M, Hikage T, Nojima T, Takahashi S, Shirai T. · 2011
Researchers exposed male Sprague-Dawley rats to a 1.95 GHz W-CDMA signal for 5 hours per day, 7 days a week for 5 weeks at whole-body SARs of 0.4 and 0.08 W/kg. There were no differences in body weight gain or weights of the testis, epididymis, seminal vesicles, and prostate among the groups. The number of sperm in the testis and epididymis were not decreased in the EMF exposed groups, and the testicular sperm count was significantly increased with the 0.4 SAR. Abnormalities of sperm motility or morphology and the histological appearance of seminiferous tubules, including the stage of the spermatogenic cycle, were not observed. Thus, under the present exposure conditions, no testicular toxicity was evident.
Unknown authors · 2011
Unknown authors · 2011
This 2011 review examined animal studies on extremely low frequency (ELF) magnetic fields like those from power lines, focusing on potential health risks to children. Researchers found that while childhood leukemia shows consistent association with ELF exposure in human studies, animal experiments have provided limited supporting evidence, partly because most didn't use appropriate leukemia models or expose animals during the critical pregnancy period when childhood leukemia may originate.
Unknown authors · 2011
Researchers exposed human SH-SY5Y neuroblastoma cells to 50 Hz magnetic fields at 100 µT for 24 hours followed by chemical exposure for 3 hours. The chemicals used were menadione and methyl methanesulphonate to induce DNA damage and micronucleus formation. Pre-treatment with magnetic fields enhanced menadione-induced DNA damage, DNA repair rate, and micronucleus formation. Similar effects were seen with methyl methanesulphonate but were not statistically significant. No effects were observed from magnetic field exposure alone.
Unknown authors · 2011
Researchers exposed human brain cancer cells to 50 Hz magnetic fields (the same frequency as power lines) for 24 hours, then treated them with a DNA-damaging chemical called menadione. The magnetic field pre-exposure made the chemical cause significantly more DNA damage and genetic mutations than the chemical alone. This suggests that power line frequency magnetic fields may make cells more vulnerable to other cancer-causing agents.
Ciejka E, Kleniewska P, Skibska B, Goraca A · 2011
Researchers exposed rats to 40 Hz magnetic fields at 7 mT (milliTesla) for either 30 or 60 minutes daily over 10 days to study brain cell damage. They found that shorter exposures (30 minutes) increased harmful oxidative stress markers in the brain, while longer exposures (60 minutes) triggered protective adaptation responses. This suggests that magnetic field exposure duration significantly affects how the brain responds to electromagnetic stress.
Ciejka E, Kleniewska P, Skibska B, Goraca A. · 2011
Researchers exposed rats to magnetic fields similar to therapeutic devices for 30 or 60 minutes daily. Thirty minutes caused brain cell damage, but sixty minutes activated protective responses. This shows exposure duration determines whether magnetic fields harm or help the brain adapt.
Emre M, Cetiner S, Zencir S, Unlukurt I, Kahraman I, Topcu Z · 2011
Researchers investigated the effect of extremely low-frequency electromagnetic field exposure with pulse trains on lipid peroxidation and oxidative stress in rat liver tissue. The study used 30 adult male Wistar rats and measured plasma enzyme and protein levels, as well as apoptotic and necrotic cell percentages in kidney extracts. Oxidative stress indicators increased, and necrotic cell percentages were significantly lower in exposed animals compared to unexposed or sham control groups, though DNA ladder analyses did not differentiate between the groups.
Kwon MS et al. · 2011
Researchers used positron emission tomography with an 18F-deoxyglucose tracer to investigate the effects of mobile phone radiation on cerebral glucose metabolism in humans. Thirteen young right-handed male subjects were exposed to a pulse-modulated 902.4 MHz Global System for Mobile Communications signal for 33 minutes while performing a simple visual vigilance task. The relative cerebral metabolic rate of glucose was significantly reduced in the temporoparietal junction and anterior temporal lobe of the right hemisphere, on the same side as the exposure. The exposure did not affect task performance, measured by reaction time and error rate.
Sannino A et al. · 2011
Researchers exposed human peripheral blood lymphocytes in G0, G1, or S-phase to 900 MHz RF at 1.25 W/kg for 20 hours, then treated them with mitomycin C. The incidence of micronuclei was evaluated to determine adaptive response. Cells exposed in S-phase showed an adaptive response, while those exposed in G0 or G1 did not.
Sakurai T et al. · 2011
The study used DNA microarray to examine gene expression in SVGp12 human glial cells after exposure to 2.45 GHz continuous-wave RF fields at SARs of 1, 5, and 10 W/kg for 1, 4, and 24 hours. Microarray analysis identified 23 assigned and 5 non-assigned gene spots as potentially altered. Follow-up RT-PCR analysis of Twenty-two genes showed no significant alterations in gene expression. The authors concluded that under their experimental conditions they found no evidence that RF field exposure affected gene expression in SVGp12 cells.
Sakurai T et al. · 2011
Japanese researchers exposed human brain cells (glial cells) to 2.45 GHz radiofrequency radiation at various power levels for up to 24 hours and examined whether this changed gene activity. Using advanced genetic analysis techniques, they found no significant changes in how genes were expressed in the exposed cells compared to unexposed controls. This suggests that RF radiation at these levels did not trigger detectable genetic responses in this type of brain cell.
Unknown authors · 2011
After 15 days, nine new proteins involved in cellular defense, organization, and proliferation appeared, including peroxiredoxin isoenzymes (2, 3, and 6), 3-mercaptopyruvate sulfurtransferase, actin cytoplasmatic 2, t-complex protein subunit beta, ropporin-1A, profilin-2, and spindlin-1. ELF-MF exposure altered proliferative status, cell growth pattern, and cytoskeletal organization, supporting a hypothesis that ELF radiation could trigger a shift toward a more invasive phenotype.
Cao Y, Xu Q, Jin ZD, Zhou Z, Nie JH, Tong J. · 2011
Adult male Kunming mice were exposed to 900 MHz radiofrequency fields at power intensities of 12, 120 and 1200 μW/cm(2) for 1 h/day for 14 days and then subjected to whole body gamma-irradiation. Compared with mice exposed to gamma-radiation alone, the RF pre-exposed mice showed a significant increase in survival time and a reduction in hematopoietic tissue damage. The researchers described this effect as appearing similar to the 'adaptive response' which is well documented in scientific literature.
Türker Y et al. · 2011
Thirty male Wistar Albino rats were divided into five groups, with three groups receiving 2.45-GHz radiation for 60 minutes per day over 28 days. Radiation exposure increased lipid peroxidation and decreased vitamins A, C, and E in heart tissue.
Türker Y et al. · 2011
Researchers exposed rats to 2.45-GHz radiation (the same frequency used by Wi-Fi and microwaves) for one hour daily over 28 days and found it caused oxidative stress in heart tissue. The study showed that supplements selenium and L-carnitine could partially protect against this damage by reducing harmful free radicals and supporting the body's natural antioxidant defenses. This suggests that common wireless frequencies may stress cardiovascular tissue at the cellular level.
Watilliaux A, Edeline JM, Lévêque P, Jay TM, Mallat M · 2011
Researchers exposed young rats on postnatal days 5, 15, or 35 to a GSM 1,800 MHz signal for 2 hours at 1.7–2.5 W/kg SAR and compared them to pseudo-exposed littermates. Western blotting measured heat shock proteins HSP60, HSC70, HSP90, serine racemase, glutamate transporters GLT1 and GLAST, and glial fibrillary acidic protein GFAP in total and soluble extracts. The GSM signal had no significant effect on any of these proteins, and immunohistochemical staining for CD68 showed no differences in microglial morphology or distribution.
Watilliaux A, Edeline JM, Lévêque P, Jay TM, Mallat M. · 2011
French researchers exposed developing rats to cell phone radiation (1800 MHz) for 2 hours at SAR levels of 1.7-2.5 W/kg to see if it would trigger stress responses or damage in brain cells. They found no evidence of cellular stress, inflammation, or damage to the glial cells that support brain function. This suggests that brief exposures to cell phone radiation at these levels may not cause immediate harm to developing brain tissue.
Osera C et al. · 2011
Researchers investigated the effects of an electromagnetic wave at 2 mT and 75 Hz on human neuroblastoma cells overexpressing amyloid precursor protein (APP). After prolonged electromagnetic treatment, lower mitochondrial activity and proliferation rate were observed, resulting in higher cellular quiescence. The treatment was also associated with an overall increase of HSP70 and superoxide dismutase-1 (SOD-1), and with increased expression of the enzyme ADAM10 and enhanced release of the neurotrophic factor sAPPα. The researchers suggested a possible use of this physical stimulation to improve the functional capability of cells to face noxae.
Sauter C et al. · 2011
Researchers tested 30 healthy young men exposed to GSM 900, WCDMA, and sham signals over nine study days. After correction for multiple testing, only time-of-day effects remained significant in two tests, resulting in faster reactions in the afternoon trials. Univariate comparisons revealed significant changes for GSM 900 only in the vigilance test. WCDMA exposure altered one parameter in vigilance and one in divided attention, while selective attention and the n-back task were not affected by either exposure.
Sauter C et al. · 2011
German researchers exposed 30 young men to mobile phone signals (GSM 900 and WCDMA) for over 7 hours to test effects on cognitive function including attention and working memory. While some minor changes appeared in vigilance tests, these effects disappeared when researchers properly accounted for statistical testing and time-of-day variations. The study found no evidence that extended mobile phone radiation exposure impairs cognitive performance.
Unknown authors · 2011
Researchers conducted a case-control study of 162 children with acute lymphocytic leukemia and 565 matched controls in São Paulo, Brazil. Exposure to extremely low frequency magnetic fields was assessed by measurements inside homes and distance to power lines. For 24-hour bedroom measurements, magnetic fields of 0.3 microtesla or higher showed no increased leukemia risk compared to levels below 0.1 microtesla (OR 1.09, 95% CI 0.33-3.61). Nighttime measurements gave an odds ratio of 1.52 (95% CI 0.46-5.01), while living within 200 meters of power lines gave an odds ratio of 1.67 (95% CI 0.49-5.75) and within 50 meters an odds ratio of 3.57 (95% CI 0.41-31.44).
Sirav B, Seyhan N · 2011
Researchers exposed male and female Wistar albino rats to 0.9 and 1.8 GHz continuous-wave radiofrequency radiation for 20 minutes to investigate effects on blood-brain barrier permeability. A significant increase in albumin was found in the brains of the RF-exposed male rats when compared to sham-exposed male brains. In female rats, no albumin extravasation was found in the brain after RFR exposure. The researchers noted that these results suggest that exposure at levels below the international limits can affect vascular permeability in the brain of male rats.
Unknown authors · 2011
Researchers studied mitotic spindle disturbances and apoptosis activation in V79 Chinese hamster cells exposed to continuous 2.45 GHz microwaves to investigate non-thermal cell damage. Exposure for 15 minutes significantly increased the proportion of aberrant spindles and apoptotic cells and decreased the mitotic index compared with untreated cells. Control heating experiments showed that spindle assembly was unaffected up to 41°C and apoptosis occurred only at 40°C, a temperature higher than that reached during microwave exposure.
