Marjanovic AM, Pavicic I, Trosic I, · 2015
Researchers evaluated the influence of a modulated radiofrequency field of 1800 MHz, strength of 30 V/m on oxidation-reduction processes within the cell. V79 cell line samples were irradiated for 10, 30, and 60 minutes, with a specific absorption rate calculated to be 1.6 W/kg. ROS levels significantly increased after 10 minutes of exposure, then decreased after 30 minutes, which researchers associated with antioxidant defence mechanism activation. Metabolic activity and total protein content in exposed cells did not differ significantly from control samples.
Marjanovic AM, Pavicic I, Trosic I · 2015
Scientists exposed hamster cells to cell phone radiation (1800 MHz) for 10-60 minutes. Even brief 10-minute exposures significantly increased harmful molecules called reactive oxygen species that can damage cells, showing that phone radiation disrupts cellular balance.
Maskey D, Kim MJ · 2014
Researchers exposed mice to radiofrequency radiation at 1.6 W/kg (similar to cell phone levels) and examined brain proteins that protect auditory neurons. They found significant decreases in two protective proteins (BDNF and GDNF) in the superior olivary complex, a brain region crucial for hearing and sound processing. This suggests RF exposure may harm the brain's auditory system by reducing proteins that normally keep hearing neurons healthy.
Maskey D, Kim MJ · 2014
Researchers applied radiofrequency at a specific absorption rate of 1.6 W/kg or 0 W/kg to mice to study the distribution of BDNF and GDNF in the nuclei of the superior olivary complex. In the exposed group, significant reductions in BDNF immunoreactivity were noted in the lateral superior olive, medial superior olive, superior paraolivary nucleus, and medial nucleus of the trapezoid body. GDNF immunoreactivity was also significantly decreased (p < 0.001) in all superior olivary complex nuclei of the exposed group. The researchers suggested that the decrease in these neurotrophic factors in the superior olivary complex suggests a detrimental effect of RF exposure in the auditory nuclei.
Luo Q, Jiang Y, Jin M, Xu J, Huang HF. · 2013
Researchers exposed pregnant volunteers at about 50 days gestation to cell phone EMF at 1.6 to 8.8 W/kg for one hour. They used two-dimensional electrophoresis to examine protein profile changes and found up to 15 spots with significant 2- to 2.5-fold changes compared to sham-exposed group. Twelve proteins were identified, including procollagen-proline, eukaryotic translation elongation factor 1 delta, and others.
Banaceur S, Banasr S, Sakly M, Abdelmelek H · 2013
Researchers studied the effects of 2.4 GHz radiofrequency signals on wildtype mice and triple transgenic mice bred to develop Alzheimer's-like cognitive impairment. Mice were exposed two hours per day during one month at a Specific Absorption Rate of 1.60 W/kg. The researchers reported that radiofrequency exposure improved cognitive behavior in the 3xTg-AD mice.
Banaceur S, Banasr S, Sakly M, Abdelmelek H. · 2013
Researchers exposed mice with Alzheimer's-like symptoms to WiFi signals (2.4 GHz) for two hours daily over a month at levels similar to cell phone exposure. Surprisingly, the WiFi exposure actually improved cognitive performance and memory in the Alzheimer's mice compared to unexposed mice. This unexpected finding suggests radiofrequency radiation might have therapeutic potential for certain brain conditions, though the mechanism remains unclear.
Aldad TS, Gan G, Gao XB, Taylor HS · 2012
Researchers used a mouse model to examine whether in-utero radiofrequency exposure from cellular telephones affects adult behavior. Mice exposed in the womb were hyperactive and had impaired memory, as measured using the object recognition, light/dark box, and step-down assays. The exposed mice also had dose-responsive impaired glutamatergic synaptic transmission onto layer V pyramidal neurons of the prefrontal cortex.
Maskey D, Kim HJ, Kim HG, Kim MJ. · 2012
Researchers exposed mice to 835 MHz radiofrequency at SAR values of 1.6 W/kg and 4.0 W/kg for one month to study effects in the hippocampus. Compared with a sham control group, both exposed groups showed decreased calbindin D28-k and calretinin, loss of immunoreactive cells, and increased GFAP with hypertrophic cytoplasmic processes. The group exposed at 4.0 W/kg showed a more prominent decrease in calbindin and calretinin, and more prominent GFAP immunoreactivity, than the group exposed at 1.6 W/kg.
Maskey D, Kim HJ, Kim HG, Kim MJ · 2012
Researchers exposed mice to cell phone frequency radiation (835 MHz) for one month at power levels similar to heavy phone use. They found significant damage to brain cells in the hippocampus, including loss of protective calcium-binding proteins and signs of brain injury that worsened at higher exposure levels. This suggests that prolonged radiofrequency exposure may harm critical brain regions involved in memory and learning.
Maskey D et al. · 2010
Researchers exposed mice to cell phone radiation (835 MHz) for one month and found almost complete loss of brain cells in the hippocampus, the region responsible for memory and learning. This suggests cell phone radiation may disrupt brain function and potentially affect memory formation.
Maskey D et al. · 2010
Researchers measured calbindin (CB) and calretinin (CR) expression in the hippocampus of mice after exposure to 835 MHz electromagnetic fields at various durations and absorption rates. Exposure conditions included 1 hour per day for 5 days at a specific absorption rate of 1.6 W/kg, 1 hour per day for 5 days at 4.0 W/kg, 5 hours per day for 1 day at 1.6 W/kg, 5 hours per day for 1 day at 4.0 W/kg, and daily exposure for 1 month at 1.6 W/kg. Exposure for 1 month produced almost complete loss of pyramidal cells in the CA1 area. Body weights did not change significantly across the exposure groups.
Maskey D et al. · 2010
Researchers exposed mice to cell phone radiation (835 MHz) for three months and found brain cell death and inflammation in the hippocampus, the brain's memory center. This demonstrates that chronic exposure to radiofrequency levels similar to cell phones can damage critical brain areas.
Maskey D et al. · 2010
Researchers investigated the effect of 835-MHz radiofrequency exposure on rat hippocampus for 3 months using immunohistochemical methods. A decrease in calbindin immunoreactivity was observed in the exposed group, with loss of interneurons and pyramidal cells in the CA1 area and loss of granule cells. An overall increase in GFAP immunoreactivity was observed in the hippocampus of exposed rats, and apoptotic cells were detected in the CA1, CA3 areas and dentate gyrus.
Lee KS, Choi JS, Hong SY, Son TH, Yu K. · 2008
Researchers studied biological effects of mobile phone 835 MHz electromagnetic fields in Drosophila at SAR 1.6 W/kg and SAR 4.0 W/kg. At SAR 1.6 W/kg, more than 90% of flies remained viable even after the 30 h exposure, while at SAR 4.0 W/kg viability dropped from the 12 h exposure. Both exposure levels triggered a stress response, increased reactive oxygen species production, and activated ERK and JNK signaling, but not p38 kinase signaling. SAR 4.0 W/kg strongly activated JNK signaling, expression of apoptotic genes, and amplified the number of apoptotic cells in the fly brain.
Mashevich M et al. · 2003
Israeli researchers exposed human blood cells to cell phone radiation (830 MHz) for 72 hours and found that higher radiation levels caused increasing chromosomal damage, specifically abnormal chromosome numbers (aneuploidy). This type of genetic damage is known to increase cancer risk. The researchers confirmed this wasn't due to heating effects, proving the radiation itself damages DNA through non-thermal mechanisms.
Mashevich M et al. · 2003
Researchers examined whether in vitro exposure of human peripheral blood lymphocytes to continuous 830 MHz electromagnetic fields causes losses and gains of chromosomes, a condition called aneuploidy. Cells were irradiated at SAR levels ranging from 1.6 to 8.8 W/kg for 72 hours. A linear increase in chromosome 17 aneuploidy was observed as a function of the SAR value, which the researchers described as a genotoxic effect. Control experiments conducted without any RF radiation across a temperature range of 34.5 to 38.5 °C showed that elevated temperature was not associated with the increased aneuploidy or the changes in centromeric DNA replication seen after RF exposure.
Zeni et al. · 2003
Van Leeuwen GM et al. · 1999
Researchers evaluated 3D temperature rise in a realistic head model induced by a mobile phone. The power distributions had a maximum averaged SAR over a 10 g volume of approximately 1.6 W kg(-1). Simulations showed a maximum brain temperature rise of 0.11 degrees C for a 0.25 W antenna with indefinite exposure, and the authors noted that temperature rises are far too small to have lasting effects.
Mugunthan N, Anbalagan J, Meenachi S, Samy AS. · 2014
Mice were exposed to 2G ultra-high frequency radiation for 48 minutes per day over 30 to 180 days, with sham controls. In the exposed group, kidney weight and volume were significantly reduced in the first month, while kidney weight alone was significantly increased in the fifth month. Microscopic examination revealed dilated glomerular capillaries, increased urinary space, wider tubular lumens with reduced cell size, brush border interruption, vacuolated cytoplasm, pyknotic nuclei, and marked basal striations in distal tubules. The researchers concluded that chronic exposure to 2G cell phone radiation could cause microscopic changes in the glomerulus, proximal and distal convoluted tubules.
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.
Yamaguchi H et al. · 2003
Sprague-Dawley rats were exposed to pulsed 1439 MHz TDMA fields at a brain SAR of 7.5 W/kg for 1 hour daily over 4 days or 4 weeks. Other rats were exposed at a brain SAR of 25 W/kg for 45 minutes daily for 4 days. Rats exposed at 25 W/kg for 4 days showed statistically significant decreases in correct choices in a T-maze reversal task, while rats exposed at 7.5 W/kg for 4 days or 4 weeks showed no performance impairments. Intraperitoneal temperature increased only at the 25 W/kg exposure level. The authors concluded that TDMA fields at levels about four times higher than cell phone emissions do not affect learning and memory when no thermal effects occur.
Trunk A et al. · 2015
Researchers used a full factorial design with 25 participants performing a visual target detection task while recording reaction time and EEG. Target trials were divided into low and high probability sets based on the distance between consecutive targets. Caffeine further shortened reaction time in high-probability trials and decreased pre-target alpha amplitude, indicating higher arousal. UMTS exposure alone or combined with caffeine did not change reaction time or pre-stimulus oscillatory brain activity.
Trunk A et al. · 2014
Hungarian researchers studied whether mobile phone radiation affects brain activity during visual tasks, and whether caffeine changes this effect. They exposed 20 people to 3G phone signals at 1.75 watts per kilogram while measuring brain waves during a simple visual test. The mobile phone exposure had no detectable impact on brain activity or reaction times, either alone or combined with caffeine.
