Mohammadi F, Ghanati F, Sharifi M, Chashmi NA · 2018
Exposure to the static magnetic field delayed the G1 to S transition in the cell cycle, accompanied by a decrease in cyclin-dependent kinase A and D-type cyclin. The static magnetic field also increased levels of nitric oxide, hydrogen peroxide, and salicylic acid compared to the control group.
Mahmoudinasab H, Saadat M. · 2018
Researchers measured the effects of morphine and EMF, in combination with β-lapachone, on cell growth inhibition and expression of antioxidant genes in SH-SY5Y cells. The study used 0.50 mT intensity of 50 Hz EMF under two exposure conditions: "15 min field-on/15 min field-off" and "30 min field-on continuously." Under the "15 min field-on/15 min field-off" condition, NQO1 mRNA level decreased while NQO2 expression increased. Multiple linear regression analysis indicated that NQO1 mRNA levels were associated positively with β-lapachone and negatively with EMF.
Consales C et al. · 2018
Unknown authors · 2017
Sanie-Jahromi F, Saadat M · 2017
Unknown authors · 2017
Researchers exposed Salmonella Hadar to a 200 mT static magnetic field for 3, 6, and 9 hours and measured gene expression using RT-PCR. No significant differences were found in plsB, cdsA, pgpA, pgsA, and psd expression across exposure times. Significant increases occurred in g3pd and pssA after 6 hours and in cls after 3 hours, but no variation was seen after 9 hours.
Luukkonen J et al. · 2017
Researchers pre-exposed human SH-SY5Y neuroblastoma cells to a 50 Hz, 100 μT magnetic field for 24 hours before treating them with menadione for 1 or 3 hours. They measured DNA damage response proteins using immunoblotting, DNA damage with the alkaline Comet assay, and cell cycle distribution with SYTOX Green staining and flow cytometry. The main findings were decreased p21 protein levels after 1-hour menadione treatment and increased G1 phase cells with decreased S phase cells after 3-hour menadione treatment. These effects were also observed without menadione. The authors concluded that magnetic field exposure can alter the G1 checkpoint response and that p21 may be involved in early responses to magnetic field exposure.
Unknown authors · 2017
Researchers exposed isolated Agrobacterium tumefaciens to square amplitude modulated waves at different extremely low frequencies to find a resonance frequency that inhibits growth. The carrier was a 10 MHz sine wave at ±10 Vpp modulated with ±2 Vpp depth at a constant field strength of 200 V/m and 28 °C. Exposure to 1.0 Hz QAMW for 90 minutes inhibited bacterial growth by 49.2%. Antibiotics became more effective against the bacteria after exposure. In tomato plants, crown gall symptoms were more aggressive with non-exposed bacteria than with exposed bacteria.
Unknown authors · 2017
Researchers investigated the effect of 1950 MHz Universal Mobile Telecommunication System radiofrequency exposure on Chinese hamster lung fibroblast V79 cells. Genotoxic and cytotoxic effects were measured using the cytokinesis-block micronucleus assay after 20-hour exposures at SAR values of 0.15, 0.3, 0.6, and 1.25 W/kg. Exposure at 0.15 and 0.3 W/kg significantly increased micronucleus frequency without cytotoxicity, while 0.6 and 1.25 W/kg had no effect. Pre-exposure at 1.25 W/kg for 20 hours before MMC treatment significantly reduced micronucleus frequency compared to MMC alone, indicating an adaptive response, whereas pre-exposure at 0.3 W/kg did not.
Suzuki S et al. · 2017
The purpose of this study was to evaluate the effects of 3rd-generation (3G) cellular phone radiofrequency-electromagnetic wave (RF-EMW) exposure on fertilization and embryogenesis in mice. Oocytes and spermatozoa were exposed to 1.95 GHz RF-EMWs at 2 mW/g for 60 minutes or sham exposure. After RF-EMW exposure, in vitro fertilization and intracytoplasmic sperm injection were performed. Groups compared were both exposed, both non-exposed, one exposed, and the other non-exposed. Fertilization, embryogenesis, and blastocyst formation rates did not change significantly across the four groups.
Su L, Wei X, Xu Z, Chen G · 2017
Researchers exposed neurogenic A172, U251, and SH-SY5Y cells to 1800 MHz RF-EMF at 4.0 W/kg intermittently for 1, 6, or 24 hours. DNA damage was measured by quantifying γH2AX foci, an early marker of DNA double-strand breaks. Cell cycle progression, proliferation, and viability were assessed using flow cytometry, hemocytometer, and cell counting kit-8 assay. Exposure did not significantly induce γH2AX foci formation or cause abnormal cell cycle progression, proliferation, or viability. Prolonged incubation up to 48 hours after exposure also did not significantly affect cellular behavior.
Ghatei N et al. · 2017
Researchers exposed pregnant BALB/c mice to mobile phone jammer radiation at 900 and 1800 MHz on the 19th day of pregnancy. After birth, offspring were divided into four exposure groups and examined at 8-10 weeks of age. Cerebellar expression of bax, bcl-2, p21, and p53 was measured by real-time RT-PCR. Radiation did not change bcl-2 or p53 expression (P>0.05). Radiation decreased bax expression and increased p21 expression compared to controls (P<0.05).
Danese E et al. · 2017
Researchers exposed blood samples from 14 healthy volunteers to 900 MHz radiofrequency from a commercial mobile phone for 30 minutes. A control sample was kept away from radiofrequency sources. DNA integrity was measured by analyzing γ-H2AX foci in lymphocytes using immunofluorescence staining. No measure of γ-H2AX foci was significantly influenced by the exposure, and the odds ratio for genetic damage ranged from 0.27 to 1.00.
Villarini M et al. · 2017
Researchers exposed SH-SY5Y5 and SK-N-BE-2 neuroblastoma cells to 50 Hz magnetic fields at 0.01, 0.1, or 1 mT, aluminum chloride at 4 or 40 µM, or both together for 1 hour continuously or 5 hours intermittently. They measured DNA damage with the comet assay, redox status via GSH/GSSG ratio, and Hsp70 expression by western blot and real-time RT-PCR. Neither the magnetic field nor aluminum alone caused DNA damage, altered the GSH/GSSG ratio, or changed Hsp70 levels, and combined exposure showed no synergistic toxic effect.
Qureshi ST, Memon SA, Abassi AR, Sial MA, Bughio FA. · 2017
Researchers exposed dry chickpea seeds to GSM cell phone radiation at 900 MHz and laptop radiation at 3.31 GHz for 24 and 48 hours. Untreated seeds served as a negative control and gamma rays at 250 Gray served as a positive control. All radiofrequency treatments inhibited seed germination, with the 48-hour laptop exposure showing the strongest negative effect. Mitotic index decreased and abnormality index increased as exposure duration and frequency increased. Cell membrane damage, nuclear membrane damage, and ghost cells were observed only after 48 hours of exposure.
Mokarram P, Sheikhi M, Mortazavi SMJ, Saeb S4 Shokrpour N · 2017
Exposure to RF radiation altered the ERα gene methylation pattern compared to non-exposed controls. A subsequent gamma-ray challenge dose did not induce an adaptive response in ERα methylation. The study concluded that GSM mobile phone RF radiation can lead to epigenetic detrimental changes in ERα promoter methylation.
Ibitayo AO et al. · 2017
Researchers divided young male rats into four groups, with three groups exposed to 2.5 Ghz radiation for 30, 45, or 60 consecutive days. DNA damage was detected using agarose gel electrophoresis, and histomorphometry showed perivascular congestion and tissue damage.
D'Silva MH, Swer RT, Anbalagan J, Rajesh B. · 2017
Fertilized chick embryos were incubated in four groups: 2G exposed (60 eggs), 3G exposed (60 eggs), sham exposed control (60 eggs), and control (48 eggs). After the scheduled exposure duration, embryos were collected for histological analysis of liver structure and alkaline comet assay for DNA damage. Exposure of developing chick embryos to 2G and 3G cell phone radiations caused structural changes in liver including dilated sinusoidal spaces with haemorrhage, increased vacuolations in cytoplasm, increased nuclear diameter and karyorrhexis. DNA damage was significantly increased in embryos exposed to 2G and 3G radiation. The changes were more pronounced in the 3G experimental group.
de Oliveira FM, Carmona AM2 Ladeira C. · 2017
To test whether mobile phone-associated EMF exposure affects micronucleus frequency in exfoliated buccal cells, the researchers obtained cell smears from the left and right inner cheeks of 86 healthy mobile phone users aged 18-30 who completed a characterization survey. No relationship was observed between micronucleus frequency and duration of mobile phone use in daily calls. Cells on the same side as phone use did not show a statistically significantly higher micronucleus frequency compared to cells on the opposite side. A highly statistically significant increase in micronucleus frequency was found in subjects reporting regular exposure to genotoxic agents.
Zothansiama, Zosangzuali M, Lalramdinpuii M, Jagetia GC. · 2017
The study compared 40 individuals living within 80 meters of mobile phone base stations with a control group living 300 meters away, matched for age, gender, diet, smoking, alcohol, and mobile phone use. Radiofrequency power density was significantly higher in the exposed group. The exposed group showed a significantly higher frequency of micronuclei. Plasma antioxidants glutathione, catalase, and superoxide dismutase were significantly reduced, and lipid peroxidation was increased in the exposed group. Multiple linear regression showed that higher RF power density was associated with lower antioxidant levels, higher micronuclei frequency, and higher lipid peroxidation.
Pandey N, Giri S, Das S, Upadhaya P. · 2017
Swiss albino mice were exposed to 900 MHz RFR for 4 hours and 8 hours per day for 35 days, with one group terminated after exposure and another kept for an additional 35 days post-exposure. RFR exposure caused mitochondrial membrane depolarization and redox imbalance, along with statistically significant increases in DNA damage index and sperm head defects. Flow cytometry showed a 2.5-fold increase in spermatogonia and decreased spermatids, with reduced turnover ratios indicating premeiotic arrest and low sperm count. Histological alterations included sloughing of immature germ cells, epithelium depletion, and maturation arrest, but all changes showed recovery to varied degrees after the post-exposure period.
Gulati S, Yadav A, Kumar N, Priya K, Aggarwal NK, Gupta R. · 2017
Researchers examined superoxide dismutase enzyme activity, catalase enzyme activity, lipid peroxidation, and functional polymorphisms of SOD and CAT antioxidant genes in a human population exposed to mobile tower radiation. Exposed subjects showed significantly lower manganese superoxide dismutase and catalase enzyme activities and higher lipid peroxidation than control subjects. Polymorphisms in the MnSOD and CAT genes significantly contributed to the observed phenotype.
Sun Y, Zong L, Gao Z, Zhu S, Tong J, Cao Y · 2017
Researchers exposed HL-60 human leukemia cells to continuous 900MHz radiofrequency fields at 120μW/cm² for 4 hours per day over 5 consecutive days. Exposed cells had significantly increased reactive oxygen species and decreased mitochondrial transcription factor A, mtDNA polymerase gamma, mtDNA transcripts, and mtDNA copy number compared to sham-exposed controls. Exposed cells also showed a significant increase in the oxidative damage marker 8-OHdG and a significant decrease in ATP. Pretreating cells with melatonin, a free radical scavenger, reversed the effects seen in RF-exposed cells.
Al-Serori H et al. · 2017
Researchers investigated whether UMTS radiofrequency signals cause micronucleus formation and other anomalies such as nuclear buds and nucleoplasmatic bridges in human glioblastoma cell lines. The experiments were conducted with human glioblastoma cell lines, U87 with wild-type p53 status and U251 with mutated p53 status, exposed to SAR doses of 0.25, 0.50, and 1.00 W/kg. The researchers found no evidence for induction of micronuclei or other anomalies, but observed apoptosis at the highest dose in U251 cells.
Manta AK et al. · 2017
Researchers exposed four-day-old adult female Drosophila melanogaster to mobile-phone radiation for 30 minutes at a SAR of 0.15 W/kg and a SAE of 270 J/kg. Reactive oxygen species levels in follicles of pre-choriogenic stages were found to increase by 1.6-fold immediately after the end of exposure. Sporadically generated apoptotic follicles showed an averaged 2-fold upregulation in their sub-population mass, 4 hours after irradiation. Microarray analysis revealed 168 genes being differentially expressed 2 hours after exposure, associated with processes such as basic metabolism, stress response, and apoptotic death.