Oxidative mechanisms of biological activity of low-intensity radiofrequency radiation

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DOI: 10.3109/15368378.2015.1043557 · Source: PubMed
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Abstract
This review aims to cover experimental data on oxidative effects of low-intensity radiofrequency radiation (RFR) in living cells. Analysis of the currently available peer-reviewed scientific literature reveals molecular effects induced by low-intensity RFR in living cells; this includes significant activation of key pathways generating reactive oxygen species (ROS), activation of peroxidation, oxidative damage of DNA and changes in the activity of antioxidant enzymes. It indicates that among 100 currently available peer-reviewed studies dealing with oxidative effects of low-intensity RFR, in general, 93 confirmed that RFR induces oxidative effects in biological systems. A wide pathogenic potential of the induced ROS and their involvement in cell signaling pathways explains a range of biological/health effects of low-intensity RFR, which include both cancer and non-cancer pathologies. In conclusion, our analysis demonstrates that low-intensity RFR is an expressive oxidative agent for living cells with a high pathogenic potential and that the oxidative stress induced by RFR exposure should be recognized as one of the primary mechanisms of the biological activity of this kind of radiation.
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ISSN: 1536-8378 (print), 1536-8386 (electronic)
Electromagn Biol Med, Early Online: 1–16
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2015 Informa Healthcare USA, Inc. DOI: 10.3109/15368378.2015.1043557
REVIEW ARTICLE
Oxidative mechanisms of biological activity of low-intensity
radiofrequency radiation
Igor Yakymenko
1
, Olexandr Tsybulin
2
, Evgeniy Sidorik
1
, Diane Henshel
3
, Olga Kyrylenko
4
and Sergiy Kyrylenko
5
1
Institute of Experimental Pathology, Oncology and Radiobiology of NAS of Ukraine, Kyiv, Ukraine,
2
Department of Biophysics, Bila Tserkva National
Agrarian University, Bila Tserkva, Ukraine,
3
School of Public and Environmental Affairs, Indiana University Bloomington, Bloomington, IN, USA,
4
A.I.Virtanen Institute, University of Eastern Finland, Kuopio, Finland, and
5
Department of Structural and Functional Biology, University of
Campinas, Campinas, SP, Brazil
Abstract
This review aims to cover experimental data on oxidative effects of low-intensity radio-
frequency radiation (RFR) in living cells. Analysis of the currently available peer-reviewed
scientific literature reveals molecular effects induced by low-intensity RFR in living cells; this
includes significant activation of key pathways generating reactive oxygen species (ROS),
activation of peroxidation, oxidative damage of DNA and changes in the activity of antioxidant
enzymes. It indicates that among 100 currently available peer-reviewed studies dealing with
oxidative effects of low-intensity RFR, in general, 93 confirmed that RFR induces oxidative
effects in biological systems. A wide pathogenic potential of the induced ROS and their
involvement in cell signaling pathways explains a range of biological/health effects of low-
intensity RFR, which include both cancer and non-cancer pathologies. In conclusion, our
analysis demonstrates that low-intensity RFR is an expressive oxidative agent for living cells
with a high pathogenic potential and that the oxidative stress induced by RFR exposure should
be recognized as one of the primary mechanisms of the biological activity of this kind of
radiation.
Keywords
Cellular signaling, cancer, free radicals,
oxidative stress, radiofrequency radiation,
reactive oxygen species
History
Received 10 January 2015
Accepted 12 April 2015
Published online 7 July 2015
Introduction
Intensive development of wireless technologies during the last
decades led to a dramatic increase of background radio-
frequency radiation (RFR) in the human environment. Thus,
the level of indoor background RFR in industrialized
countries increased 5,000-fold from 1985 to 2005 (Maes,
2005). Such significant environmental changes may have a
serious impact on human biology and health. As a proof of
such impact, a series of epidemiological studies on the
increased risk of tumorigenesis in ‘‘heavy’’ users of wireless
telephony exists (Hardell et al., 2007, 2011; Sadetzki et al.,
2008; Sato et al., 2011). Some studies indicate that long-term
RFR exposure in humans can cause various non-cancer
disorders, e.g., headache, fatigue, depression, tinnitus, skin
irritation, hormonal disorders and other conditions (Abdel-
Rassoul et al., 2007; Buchner & Eger, 2011; Chu et al., 2011;
Johansson, 2006; Santini et al., 2002; Yakymenko et al.,
2011). In addition, convincing studies on hazardous effects of
RFR in human germ cells have been published (Agarwal
et al., 2009; De Iuliis et al., 2009).
All abovementioned studies dealt with the effects of low-
intensity RFR. This means that the intensity of radiation was
far below observable thermal effects in biological tissues, and
far below safety limits of the International Commissions on
Non-Ionizing Radiation Protection (ICNIRP) (ICNIRP,
1998). To date, molecular mechanisms of non-thermal effects
of RFR are still a bottleneck in the research on the biological/
health effects of low-intensity RFR, although recently many
studies have been carried out on metabolic changes in living
cells under low-intensity RFR, and comprehensive reviews
were published (Belyaev, 2010; Consales et al., 2012; Desai
et al., 2009; Yakymenko et al., 2011). In the present work, we
analyze the results of molecular effects of low-intensity RFR
in living cells and model systems, with a special emphasis on
oxidative effects and free radical mechanisms. It might seem
paradoxical that, despite being non-ionizing, RFR can induce
significant activation of free radical processes and overpro-
duction of reactive oxygen species (ROS) in living cells. We
believe that the analysis of recent findings will allow
recognition of a general picture of the potential health effects
of already ubiquitous and ever-increasing RFR.
Radiofrequency radiation
RFR is a part of electromagnetic spectrum with frequencies
from 30 kHz to 300 GHz. RFR is classified as non-ionizing,
Address correspondence to Prof. Igor Yakymenko, Laboratory of
Biophysics, Institute of Experimental Pathology, Oncology and
Radiobiology of NAS of Ukraine, Vasylkivska str. 45, Kyiv, 03022
Ukraine. E-mail: iyakymen@gmail.com
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which means that it does not carry sufficient energy for
ionization of atoms and molecules. A part of RFR with the
highest frequencies (300 MHz to 300 GHz) is referred to as
microwaves (MWs). MW is RFR with the highest energy,
which can potentially generate the highest thermal effects in
the absorbing matter.
The main indexes of RFR are (i) frequency (Hz); (ii) inten-
sity or power density (PD) of radiation (W/m
2
or mW/cm
2
); (iii)
its modulated or non-modulated nature; and (iv) continuous or
discontinuous pattern of radiation. For the absorbed RFR
energy, a parameter of specific absorption rate (SAR) is used
(W/kg). The most common digital standard of RFR for mobile
communication is still GSM (Global System for Mobile
communication), which utilizes frequencies at about 850, 900,
1800 and 1900 MHz. This radiation is frequency modulated,
with channel rotation frequency of 217 Hz, and belongs to the
radiation of the pulsed mode (Hyland, 2000).
As to the international safety limits, the ICNIRP recom-
mendations restrict intensity of RFR to 450–1000 mW/cm
2
(depending on the frequency of radiation) and the SAR value
to 2 W/kg, as calculated for human heads and torsos (ICNIRP,
1998). These indexes were adopted by ICNIRP based on the
behavioral response of laboratory rats, which were exposed to
gradually increased intensities of RFR to determine the point
at which the animals became thermally distressed
(Gandhi et al., 2012).
Low-intensity RFR is referred to as radiation with
intensities which do not induce significant thermal effects in
biological tissues. Accordingly, any intensity of RFR under
the ICNIRP limits can be referred to as low-intensity. In this
paper we will analyze only the effects of low-intensity RFR.
Physical/biophysical effects of low-intensity RFR
in living cells
RFR, especially MW, can produce thermal effects in matter
due to interaction with charged particles, including free
electrons, ions or polar molecules, inducing their oscillations
in electromagnetic field. The thermal effect of MW can be seen
when warming food in the microwave. The effect strongly
depends on the intensity of radiation and is mostly negligible
under low-intensity RFR conditions. On the other hand, energy
of RFR/MW is insufficient not only for the ionization
of molecules, but even for activation of orbital electrons.
Hence, RFR was often assessed as a factor producing only
thermal effects. Nevertheless, evident biological effects of
low-intensity RFR promoted research on physical mechanisms
of non-thermal biological effects of this kind of radiation.
A biophysical model of a forced-vibration of free ions on
the surface of a cell membrane due to external oscillating
electromagnetic field (EMF) was proposed (Panagopoulos
et al., 2000, 2002). According to the authors, this vibration of
electric charges can cause disruption of the cellular electro-
chemical balance and functions.
A ‘‘moving charge interaction’’ model was proposed for
low-frequency EMF (Blank and Soo, 2001). The authors
explained activation of genes and synthesis of stress proteins
under EMF exposure due to interaction of the field with
moving electrons in DNA (Blank and Soo, 2001; Goodman
and Blank, 2002). They also demonstrated that EMF
increased electron transfer rates in cytochrome oxidase and
accelerated charges in the Na,K-ATPase reaction. Moreover,
they demonstrated acceleration of the oscillating Belousov–
Zhabotinski reaction in homogeneous solutions due to the
application of low-frequency EMF (Blank and Soo, 2003).
An ability of low-strength magnetic fields to trigger onset-
and offset-evoked potentials was demonstrated (Marino et al.,
2009). Effectiveness of a rapid magnetic stimulus (0.2 ms) has
led the authors to a conclusion on direct interaction between
the field and ion channels in plasma membrane. A plausible
mechanism of overproduction of free radicals in living cell
due to electron spin flipping in confined free radical pairs in
magnetic field of RFR was proposed (Georgiou, 2010).
A significant effect of low-intensity RFR on ferritin, an
iron cage protein present in most living organisms from
bacteria to humans, was revealed (Ce
´
spedes and Ueno, 2009).
Exposure of ferritin solution to low-intensity RFR signifi-
cantly, up to threefold, reduced iron chelation with ferrozine.
The authors explained that magnetic field of RFR plays a
principle role in the observed effect, and that this effect is
strongly non-thermal. The non-thermal mechanism of the
interaction of RFR magnetic fields with ferritin is supposedly
mediated by an inner super-paramagnetic nanoparticle
(9H
2
O 5Fe
2
O
3
with up to 4500 iron ions), which is a
natural phenomenon intrinsic to the cells. It results in
reduction of input of iron chelates into the ferritin cage.
The authors underlined the potential role of ferritin malfunc-
tion for oxidative processes in living cell due to the
participation of Fe
2+
ions in the Fenton reaction, which
produces hydroxyl radicals. In this respect, it is interesting to
point to the results of an in vitro study with RFR exposure of
rat lymphocytes treated by iron ions (Zmys
´
lony et al., 2004).
Although RFR exposure (930 MHz) did not induce detectable
intracellular ROS overproduction, the same exposure in the
presence of FeCl
2
in the lymphocyte suspensions induced a
significant overproduction of ROS.
Another set of studies indicates on a possibility of changes
in protein conformation under RFR exposure. Thus, low-
intensity 2.45 MHz RFR accelerated conformational changes
in b-lactoglobulin through excitation of so-called collective
intrinsic modes in the protein (Bohr and Bohr, 2000a, 2000b),
which suggests a principal ability of RFR to modulate the
non-random collective movements of entire protein domains.
Similarly, a frequency-dependent effect on intrinsic flexibility
in insulin structure due to applied oscillating electric field was
demonstrated (Budi et al., 2007). Moreover, macromolecular
structure of cytoskeleton was significantly altered in fibro-
blasts of Chinese hamster after the exposure to modulated
RFR of the GSM standard (Pavicic and Trosic, 2010). Thus, a
3 h exposure of fibroblasts to modulated RFR (975 MHz) led
to significant changes in the structure of microtubules and
actin microfilaments, which have polar cytoskeleton struc-
tures, while non-polar vimentin filaments reportedly stayed
unchanged. Taking into account an extensive regulatory
potential of cytoskeleton on cell homeostasis, these data could
obviously add to the nature of the biological effects of RFR.
It was shown that ornithine decarboxylase (ODC) can
significantly change its activity under low-intensity RFR
exposure (Byus et al., 1988; Hoyto et al., 2007; Litovitz et al.,
1993, 1997; Paulraj et al., 1999).
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In addition, so-called ‘‘calcium effects’’ under RFR
exposure in living cells have been demonstrated (Dutta
et al., 1989; Paulraj et al., 1999; Rao et al., 2008), which
include a significant increase in intracellular Ca
2+
spiking.
Taking into account that calcium is a ubiquitous regulator of
cellular metabolism, these data point to a possibility that non-
thermal RFR can activate multiple Ca
2+
-dependent signaling
cascades.
Finally, an ability of low-intensity MW to dissociate water
molecules was demonstrated in model experiments years ago
(Vaks et al., 1994). In these experiments, MW of 10 GHz with
radiated power 30 mW produced a significant level of H
2
O
2
in
deionized water (and also in MgSO
4
solution) under stable
temperature conditions. According to the authors, a kinetic
excitation of liquid water associates C(H
2
O) upon the
absorption of MW leads to subsequent viscous losses due to
friction between moving clusters of water molecules. It results
in partial irreversible decomposition of water, including
breaks of intramolecular bonds (H–OH) due to a mechan-
ochemical reaction, and generation of H
;OH
;H
+
and OH
groups. Among these, the hydroxyl radical (OH
) is the most
aggressive form of ROS, which can break any chemical bond
in surrounding molecules (Halliwell, 2007). The authors
assessed that this type of mechanochemical transformation in
water could be responsible for 10
4
–10
8
relative parts of the
total MW energy absorbed. Given the fact that the water
molecules are ubiquitous in living cells, even a subtle chance
for dissociation of water molecules under low-intensity
RFR exposure could have a profound effect on tissue
homeostasis. It is of note here that one OH
radical can
initiate irreversible peroxidation of many hundreds of macro-
molecules, e.g. lipid molecules (Halliwell, 1991). Taken
together, these data show that non-thermal RFR can be
absorbed by particular charges, molecules and cellular
structures, and in this way can potentially induce substantial
modulatory effects in living cell.
Generation of reactive oxygen species under RFR
exposure in living cells
NADH oxidase of cellular membrane was suggested as a
primary mediator of RFR interaction with living cells
(Friedman et al., 2007). Using purified membranes from
HeLa cells, the authors experimentally proved that the
exposure to RFR of 875 MHz, 200 mW/cm
2
for 5 or 10 min
significantly, almost threefold, increased the activity of
NADH oxidase. NADH oxidases are membrane-associated
enzymes that catalyze one-electron reduction of oxygen into
superoxide radical using NADH as a donor of electron, thus
producing powerful ROS. This enzyme has been tradition-
ally known due to its role in induction of oxidative burst in
phagocytes as a part of immune response. Yet, later the
existence of non-phagocytic NAD(P)H oxidases was
revealed in various types of cells, including fibroblasts,
vascular and cardiac cells (Griendling et al., 2000).
Obviously, the presence of superoxide-generating enzyme
in many types of non-phagocytic cells points to the
considerable regulatory roles of ROS in living cells. On
the other hand, an ability of low-intensity RFR to modulate
the activity of the NADH oxidase automatically makes this
factor a notable and potentially dangerous effector of cell
metabolism. Notably, the authors pointed out that the
acceptor of RFR is different from the peroxide-generating
NADPH oxidases, which are also found in plasma mem-
branes (Low et al., 2012).
The other powerful source of ROS in cells is mitochondrial
electron transport chain (ETC), which can generate super-
oxide due to breakdowns in electron transport (Inoue et al.,
2003). It was demonstrated that generation of ROS by
mitochondrial pathway can be activated under RFR exposure
in human spermatozoa (De Iuliis et al., 2009). The authors
revealed a dose-dependent effect of 1.8 GHz RFR exposure on
ROS production in spermatozoa, particularly in their
mitochondria. The significantly increased level of total ROS
in spermatozoa was detected under RFR with SAR ¼ 1 W/kg,
which is below the safety limits accepted in many countries. It
was demonstrated recently in our laboratory that the exposure
of quail embryos in ovo to extremely low-intensity RFR
(GSM 900 MHz, 0.25 mW/cm
2
) during the initial days of
embryogenesis resulted in a robust overproduction of super-
oxide and nitrogen oxide radicals in mitochondria of embry-
onic cells (Burlaka et al., 2013). It is not clear yet which
particular part of ETC is responsible for the interaction with
RFR. To date, three possible sites of generation of superoxide
in ETC have been shown: the ETC complex I (Inoue et al.,
2003), complex II (Liu et al., 2002), and complex III (Guzy
and Schumacker, 2006). A significant inverse correlation
between mitochondrial membrane potential and ROS levels in
living cell was found (Wang et al., 2003). As the authors
underlined, such a relationship could be due to two mutually
interconnected phenomena: ROS causing damage to the
mitochondrial membrane, and the damaged mitochondrial
membrane causing increased ROS production.
In addition to the well-established role of the mitochondria
in energy metabolism, regulation of cell death is a second
major function of these organelles. This, in turn, is linked to
their role as the powerful intracellular source of ROS.
Mitochondria-generated ROS play an important role in the
release of cytochrome c and other pro-apoptotic proteins,
which can trigger caspase activation and apoptosis (Ott et al.,
2007). A few reports indicate on activation of apoptosis due to
low-intensity RFR exposure. In human epidermoid cancer KB
cells, 1950 MHz RFR induced time-dependent apoptosis (45%
after 3 h) that is paralleled by 2.5-fold decrease of the
expression of ras and Raf-1 and of the activity of ras and Erk-
1/2 (Caraglia et al., 2005). Primary cultured neurons and
astrocytes exposed to GSM 1900 MHz RFR for 2 h demon-
strated up-regulation of caspase-2, caspase-6 and Asc (apop-
tosis associated speck-like protein containing a card) (Zhao
et al., 2007). Up-regulation in neurons occurred in both "on"
and "stand-by" modes, but in astrocytes only in the "on"
mode. We should underline that, in that study an extremely
high biological sensitivity to RFR was demonstrated, as a cell
phone in the ‘‘stand-by’’ position emits negligibly low-
intensity of radiation (up to hundredths mW/cm
2
).
Based on the analysis of available literature data, we
identified altogether 100 experimental studies in biological
models which investigated oxidative stress due to low-
intensity RFR exposures. From these 100 articles, 93 studies
(93%) demonstrated significant oxidative effects induced by
DOI: 10.3109/15368378.2015.1043557 RFR as a powerful oxidative agent 3
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low-intensity RFR exposure (Table 1–3), while 7 studies (7%)
demonstrated the absence of significant changes (Table 4).
The total number includes 18 in vitro studies, 73 studies in
animals, 3 studies in plants and 6 studies in humans. Majority
of the research was done on laboratory rats (58 studies, with
54 positive results), while 4 studies out of 6 in humans were
positive. From the in vitro studies, 17 were positive (94.4%),
including 2 studies on human spermatozoa and 2 studies on
human blood cells.
Most of the studies utilized RFR exposure in MW range,
including a use of commercial or trial cell phones as sources
of radiation. The power densities of RFR applied in positive
studies varied from 0.1 mW/cm
2
(Oksay et al., 2014) to
680 mW/cm
2
(Jelodar et al., 2013) and SAR values varied
from 3 mW/kg (Burlaka et al., 2013) to the ICNIRP recom-
mended limit of 2 W/kg (Naziroglu et al., 2012a; Xu et al.,
2010). Exposure times in positive studies varied from 5 min
(Friedman et al., 2007) to 12.5 years, 29.6 h/month (Hamzany
et al., 2013).
The most often used indexes of oxidative stress analyzed in
the studies were ROS production, levels of lipid peroxidation
(LPO)/malondialdehyde (MDA), protein oxidation (PO),
nitric oxides (NO
x
), glutathione (GSH), activity of antioxidant
enzymes (superoxide dismutase (SOD), catalase (CAT),
glutathione peroxidase (GSH-Px)). It is important that some
studies directly pointed to induction of free radicals (super-
oxide radical, NO) as a primary reaction of living cells to
RFR exposure (Burlaka et al., 2013; Friedman et al., 2007).
As we pointed out earlier, direct activation of NADH oxidase
(Friedman et al., 2007) and the mitochondrial pathway of
superoxide overproduction (Burlaka et al., 2013; De Iuliis
et al., 2009) have been experimentally proven. Besides, a
significant overproduction of nitrogen oxide was revealed in
some studies (Avci et al., 2012; Bilgici et al., 2013; Burlaka
et al., 2013), although it is unclear whether an induction of
expression of NO-synthases or direct activation of the enzyme
took place. It is however clear that significantly increased
levels of these free radical species (superoxide and nitrogen
oxide) in cells due to RFR exposure result in an activation of
peroxidation and repression of activities of key antioxidant
enzymes. It is indicative that many studies demonstrated
effectiveness of different antioxidants to override oxidative
stress caused by RFR exposure. Such effects have been
reported for melatonin (Ayata et al., 2004; Lai and Singh,
1997; Oktem et al., 2005; Ozguner et al., 2006; Sokolovic
et al., 2008), vitamin E and C (Jelodar et al., 2013; Oral et al.,
2006), caffeic acid phenethyl ester (Ozguner et al., 2006),
selenium,
L-carnitine (Turker et al., 2011) and garlic (Avci
et al., 2012; Bilgici et al., 2013).
It is worthwhile to emphasize a strict non-thermal
character of ROS overproduction under RFR exposure
described in the cited reports. As low as 0.1 mW/cm
2
intensity
of RFR and absorbed energy (specific absorption rate, SAR)
of 0.3 mW/kg were demonstrated to be effective in inducing
significant oxidative stress in living cells (Burlaka et al.,
2013; Oksay et al., 2014). This observation is particularly
important as the modern international safety limits on RFR
exposure are based solely on the thermal effects of radiation
and only restrict RFR intensity to 450–1000 mW/cm
2
and
SAR to 2 W/kg (ICNIRP, 1998). Moreover, studies where
high (thermal) intensities of RFR have been used could not
reveal oxidative effects (Hong et al., 2012; Kang et al., 2013;
Luukkonen et al., 2009), which might point to the variety of
molecular mechanisms for different radiation intensities.
Taken together, the analysis of the contemporary scientific
literature on the biological effects of RFR persuasively proves
that the exposure to low-intensity RFR in living cells leads to
generation of significant levels of ROS and results in a
significant oxidative stress.
Oxidative damage of DNA under RFR exposure
To date more than hundred papers have been published on
mutagenic effects of RFR and most of them revealed signifi-
cant effects (Ruediger, 2009). There is a substantial number of
studies which demonstrated the formation of micronuclei
(Garaj-Vrhovac et al., 1992; Tice et al., 2002; Zotti-Martelli
et al., 2005) or structural anomalies of metaphase chromo-
somes (Garson et al., 1991; Kerbacher et al., 1990; Maes et al.,
2000) in living cells due to low-intensity RFR exposure.
However, majority of the studies on the mutagenic effects of
RFR successfully used a comet assay approach (Baohong et al.,
2005; Belyaev et al., 2006; Diem et al., 2005; Kim et al., 2008;
Lai and Singh, 1996; Liu et al., 2013a). Particular studies
identified specific marker of oxidative damage of DNA, 8-
hydroxy-2’-deoxyguanosine (8-OH-dG) (Burlaka et al., 2013;
De Iuliis et al., 2009; Guler et al., 2012; Khalil et al., 2012; Xu
et al., 2010). Thus, the level of 8-OH-dG in human
spermatozoa was shown to be significantly increased after
in vitro exposure to low-intensity RFR (De Iuliis et al., 2009).
Likewise, we demonstrated that the exposure of quail embryos
in ovo to GSM 900 MHz of 0.25 mW/cm
2
during a few days was
sufficient for a significant, two-threefold, increase of 8-OH-dG
level in embryonic cells (Burlaka et al., 2013).
It would be logical to assume that most mutagenic effects
due to the RFR exposure are caused by oxidative damage to
DNA, as the overproduction of ROS in living cells due to
RFR exposure was reliably documented. It is known that
superoxide itself does not affect DNA. The most aggressive
form of ROS, which is able to affect the DNA molecule
directly, is hydroxyl radical (Halliwell, 2007). The hydroxyl
radicals are generated in cell in the Fenton reaction (Fe
2+
+
H
2
O
2
-4 Fe
3+
+OH
+OH
) and in the Haber–Weiss
reaction (O
2

+H
2
O
2
-4 O
2
+OH
+OH
) (Valko et al.,
2006). On the other hand, increased concentration of NO in
addition to superoxide in the RFR-exposed cells can lead to
the formation of other aggressive form of ROS, peroxynitrite
(ONOO
), which can also cause DNA damage (Valko et al.,
2006).
Free radicals induced under the RFR exposure can
perturb cellular signaling
Taking into account the abovementioned data, we can state
that the exposure to RFR leads to overproduction of free
radicals/ROS in living cell. Certainly, free radicals can induce
harmful effects via direct damage due to oxidation of
biological macromolecules. To that, it becomes clear now-
adays that free radicals/ROS are an intrinsic part of the
cellular signaling cascades (Forman et al., 2014). Thus,
hydrogen peroxide appears as a second messenger both in
4 I. Yakymenko et al. Electromagn Biol Med, Early Online: 1–16
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insulin signaling and in growth factor-induced signalling
cascades (Sies, 2014). These species are also implicated in
biochemical mechanism of oxidation of ethanol and in other
metabolic processes (Oshino et al., 1975) and is also required
for initiation of wound repair (Enyedi and Niethammer,
2013). In addition, ROS at relatively low concentrations can
modulate inflammation via activation of NF-kB pathway
(Hayden and Ghosh, 2011). Therefore, even subtle exposures
to RFR with generation of hardly detectable quantities of free
radicals can have their meaningful biological consequences.
We could ascertain the signaling effects of moderate
levels of free radicals from our experiments in quail
embryos irradiated with the commercial cell phone. Thus,
we were able to show that the prolonged exposures of
embryos in ovo led to robust repression of their development
(Tsybulin et al., 2013), which was concomitant with
Table 1. Publications which reported positive findings on oxidative stress caused by RFR exposure of cells in vitro.
Reference
Biological system
exposed RFR exposure
Statistically significant effects
reported*
(Agarwal et al., 2009) Human spermatozoa Cell phone RFR, in talk mode,
for 1 h
Increase in reactive oxygen species
(ROS) level, decrease in sperm
motility and viability.
(Campisi et al., 2010) Rat astroglial cells 900 MHz (continuous or modu-
lated), electric field 10 V/m,
for5; 10; 20 min
Increase in ROS levels and DNA
fragmentation after exposure to
modulated RFR for 20 min.
(De Iuliis et al., 2009) Human spermatozoa 1.8 GHz, SAR ¼ 0.4–27.5 W/kg Increased amounts of ROS.
(Friedman et al., 2007) HeLa membranes 875 MHz, 200 mW/cm
2
, for 5 and
10 min
Increased NADH oxidase activity.
(Hou et al., 2014) Mouse embryonic
fibroblasts (NIH/3T3)
1800-MHz GSM-talk mode RFR,
SAR ¼ 2 W/kg, intermittent
exposure (5 min on/10 min off)
for 0.5–8 h
Increased intracellular ROS levels.
(Kahya et al., 2014) Cancer cell cultures 900 MHz RFR, SAR ¼ 0.36 W/kg,
for 1 h
Induced apoptosis effects through
oxidative stress, selenium counter-
acted the effects of RFR exposure.
(Lantow et al., 2006a) Human blood cells Continuous wave or GSM
signal,SAR ¼ 2 W/kg, for 30 or
45 min of continuous or 5 min
ON, 5 min OFF
After continuous or intermittent
GSMsignal a different ROS pro-
duction was detected in human
monocytes compared to sham.
(Lantow et al., 2006b) Human Mono Mac 6
and K562 cells
Continuous wave, GSM speaking
only, GSM hearing only, GSM
talk, SARs of 0.5, 1.0, 1.5 and
2.0 W/kg.
The GSM-DTX signal at 2 W/kg
produced difference in free radical
production compared to sham.
(Liu et al., 2013b) GC-2 cells 1800 MHz, SAR ¼ 1; 2 W/kg,5 min
ON, 10 min OFF for 24 h
In the 2 W/kg exposed cultures, the
level of ROS was increased.
(Lu et al., 2012) Human blood mononuclear cells 900 MHz, SAR ¼ 0.4 W/kg, for
1–8 h
The increased level of apoptosis
induced through the mitochondrial
pathway and mediated by activating
ROS and caspase-3.
(Marjanovic et al., 2014) V79 cells 1800 MHz, SAR ¼ 1.6 W/kg, for
10, 30 and 60 min
ROS level increased after 10 min of
exposure. Decrease in ROS level
after 30-min treatment indicating
antioxidant defense mechanism
activation.
(Naziroglu et al., 2012b) HL-60 cells 2450 MHz, pulsed, SAR ¼ 0.1–
2.5 W/kg,for 1; 2; 12 or 24 h
Lipid peroxide (LPO) levels were
increased at all exposure times.
(Ni et al., 2013) Human lens epithelial cells 1800 MHz, SAR ¼ 2; 3; 4 W/kg The ROS and malondialdehyde
(MDA) levels were increased.
(Pilla, 2012) Neuronal cells and
human fibroblasts
27.12 MHz, pulsed, electric field
41 V/m, 2 min prior to lipo-
polysaccharide administration
or for 15 min
Increased level of nitric oxide (NO).
(Sefidbakht et al., 2014) HEK293T cells 940 MHz, SAR ¼ 0.09 W/kg, for
15, 30, 45, 60 and 90 min
ROS generation increased in the
30 min exposed cells. A sharp rise
in catalase (CAT) and superoxide
dismutase (SOD) activity and ele-
vation of glutathione (GSH) during
the 45 min exposure.
(Xu et al., 2010) Primary cultured neurons 1800 MHz, pulsed, SAR ¼ 2 W/kg,
for 24 h
An increase in the levels of8-hydroxy-
2’-deoxyguanosine (8-OH-dG).
(Zmys
´
lony et al., 2004) Rat lymphocytes 930 MHz, PD of 500 mW/cm
2
,
SAR ¼ 1.5 W/kg, for 5 and
15 min
Intracellular ROS level increased in
exposed FeCl
2
treated cells com-
pared with unexposed FeCl
2
treated
cells.
*All effects were statistically significant (at least p50.05) as compared to control or sham exposed groups.
DOI: 10.3109/15368378.2015.1043557 RFR as a powerful oxidative agent 5
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Table 2. Publications which reported positive findings on oxidative stress caused by RFR exposure of animals and plants.
Reference Biological system exposed RFR exposure
Statistically significant effects
reported*
(Akbari et al., 2014) Rat whole body RFR from base transceiver station Glutathione peroxidase (GSH-Px),
SOD, and CAT activity
decreased and level of MDA
increased. Vitamin C reduced
the effect.
(Al-Damegh, 2012) Rat whole body Cell phone RFR, 15, 30, or 60 min/day
for 2 weeks
Levels of conjugated dienes, LPO
and CAT activities in serum and
testicular tissue increased, the
total serum and testicular tissue
GSH and GSH-Px levels
decreased.
(Avci et al., 2012) Rat whole body 1800 MHz, SAR ¼ 0.4 W/kg, 1 h/day
for 3 weeks
An increased level of protein oxi-
dation (PO) in brain tissue and
an increase in serum NO. Garlic
administration reduced protein
oxidation in brain tissue.
(Ayata et al., 2004) Rat whole body 900 MHz, 30 min/day for 10 days MDA and hydroxyproline levels
and activities of CAT and GSH-
Px were increased, andsuperox-
ide dismutase (SOD) activity
was decreased in skin.
Melatonin treatment reversed
effect.
(Aynali et al., 2013) Rat whole body 2450 MHz, pulsed, SAR ¼ 0.143 W/
kg,60 min/day for 30 days
LPO was increased, an adminis-
tration of melatonin prevented
this effect.
(Balci et al., 2007) Rat whole body ‘‘Standardized daily dose’’ of cell
phoneRFR for 4 weeks
In corneal tissue, MDA level and
CAT activity increased,
whereas SOD activity was
decreased. In the lens tissues,
the MDA level was increased.
(Bilgici et al., 2013) Rat whole body 850–950 MHz,SAR ¼ 1.08 W/kg,1 h/
day for 3 weeks
The serum NO levels and levels of
MDA and the PO in brain were
increased. An administration of
garlic extract diminished these
effects.
(Bodera et al., 2013) Rat whole body 1800 MHz, GSM, for 15 min Reduced antioxidant capacity both
in healthy animals and in those
with paw inflammation.
(Burlaka et al., 2013) Quail embryo in ovo GSM 900 MHz, power density (PD) of
0.25 mW/cm
2
,SAR¼ 3 mW/kg,
48 sec ON - 12 sec OFF, for 158–
360 h
Overproduction of superoxide and
NO, increased levels of thio-
barbituric acid reactive sub-
stances (TBARS) and 8-OH-
dG, decreased SOD and CAT
activities.
(Burlaka et al., 2014) Male rat whole body Pulsed and continuous MWin the
doses equivalent to the maximal
permitted energy load for the staffs
of the radar stations
Increased rates of superoxide pro-
duction, formation of the iron-
nitrosyl complexes and
decreased activity of NADH-
ubiquinone oxidoreductase
complex in liver, cardiac and
aorta tissues 28 days after the
exposure.
(Cenesiz et al., 2011) Guinea pig whole body 900; 1800 MHz RFR from base station
antennas, 4 h/day for 20 days
Difference in guinea pigs subjected
to 900 and 1800 MHz for
plasma oxidant status levels.
NO level changed in 900 MHz
subjected guinea pigs, as com-
pared to the control.
(Cetin et al., 2014) Pregnant rats and offspring 900; 1800 MHz RFR, 1 h/day during
pregnancy and neonatal
development
Brain and liver GSH-Px activities,
selenium concentrations in the
brain and liver vitamin A and
b-carotene concentrations
decreased in offspring.
(Dasdag et al., 2009) Head of rats 900 MHz, 2 h/day for 10 months The total antioxidant capacity and
CATactivity in brains were
higher than that in the sham
group.
(continued )
6 I. Yakymenko et al. Electromagn Biol Med, Early Online: 1–16
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Table 2. Continued
Reference Biological system exposed RFR exposure
Statistically significant effects
reported*
(Dasdag et al., 2012) Head of rats 900 MHz, cell-phones-like, 2 h/day for
10 months
Protein carbonyl level was higher
in the brain of exposedrats.
(Dasdag et al., 2008) Rat whole body 900 MHz, PD of 78 mW/cm
2
, 2 h/days
for10 months.
Increased levels of MDA and total
oxidative status in liver tissue.
(Deshmukh et al., 2013) Rat whole body 900 MHz, 2 h/day, 5 days a week for
30 days
The levels of LPO and PO were
increased.
(Esmekaya et al., 2011) Rat whole body 900 MHz, pulsed, modulated,
SAR ¼ 1.2 W/kg, 20 min/day for
3 weeks
The increased level of MDA and
NOx, and decreased levels of
GSH in liver, lung, testis and
heart tissues.
(Furtado-Filho et al., 2014) Rat whole body 950 MHz, SAR ¼ 0.01–0.88 W/
kg,30 min/day for 21 days during
pregnancy (or additionally 6 or
15 days of postnatal period)
Neonatal rats exposed in utero had
decreased levels of CAT and
lower LPO, and genotoxic
effect.
(Guler et al., 2012) Rabbit infant whole body GSM 1800 MHz, 15 min/day for 7
days (females) or 14 days (males)
LPO levels in the liver tissues of
females and males increased,li-
ver 8-OH-dG levels of females
were increased.
(Guney et al., 2007) Rat whole body 900 MHz, 30 min/day for 30 days Endometrial levels of NO and
MDA increased,endometrial
SOD, CAT and GSH-Px activ-
ities were decreased.Vitamin E
and C treatment prevented these
effects.
(Gu
¨
rler et al., 2014) Rat whole body 2450 MHz, 3.68 V/m, 1 h/day for
30 days
Increased 8-OH-dG level in both
plasma and brain tissue whereas
it increased PO level only in
plasma. Garlic prevented the
increase of 8-OH-dG level in
brain tissue and plasma PO
levels.
(Ilhan et al., 2004) Rat whole body 900 MHz, from cell phone,1 h/day for
7days
Increase in MDA, NO levels,
andxanthine oxidase (XO)
activity, decrease in SOD and
GSH-Px activities in brain.
These effects were prevented by
Ginkgo bilobaextract treatment.
(Jelodar, et al., 2013) Rat whole body 900 MHz, PD of 680 mW/cm
2
, 4 h/day
for 45 days,
The concentration of MDA was
increased and activities of SOD,
GSH-Px and CAT were
decreased in rat eyes. An
administration of vitamin C
prevented these effects.
(Jelodar et al., 2013) Rat whole body 900 MHz, daily for 45 days Increased level of MDA and
decreased antioxidant enzymes
activity in rat testis.
(Jing et al., 2012) Rat whole body Cell phone RFR, SAR ¼ 0.9 W/kg,3 x
10; 30 or 60 min for 20 days during
gestation
After 30 and 60 min the level of
MDA was increased, the activ-
ities of SOD and GSH-Pxwere
decreased.
(Kerman & Senol, 2012) Rat whole body 900 MHz, 30 min/day for 10 days Tissue MDA levels were
increased, SOD, CAT and GSH-
Pxactivities were reduced.
Melatonin treatment reversed
these effects.
(Kesari et al., 2010) Male rat whole body Cell phone RFR, SAR ¼ 0.9 W/kg,2 h/
day for 35 days
Reduction in protein kinase activ-
ity, decrease in sperm count and
increase in apoptosis.
(Kesari et al., 2011) Rat whole body 900 MHz, pulsed, SAR ¼ 0.9 W/
kg,2 h/day for 45 days
Increase in the level of ROS,
decrease in the activities of
SOD and GSH-Px,and in the
level of pineal melatonin.
(Kesari et al., 2013) Rat whole body 2115 MHz, SAR ¼ 0.26 W/kg,2 h/day
for 60 days
The level of ROS, DNA damage
and theapoptosis rate were
increased.
(Khalil et al., 2012) Rat whole body 1800 MHz, electric field 15–20 V/m,
for2 h
Elevations in the levels of 8-OH-
dG in urine.
(continued )
DOI: 10.3109/15368378.2015.1043557 RFR as a powerful oxidative agent 7
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Table 2. Continued
Reference Biological system exposed RFR exposure
Statistically significant effects
reported*
(Kismali et al., 2012) Rabbit whole body (non-
pregnant and pregnant)
1800 MHz, GSM modulation,
15 min/day for 7 days
Creatine kinases levels changes.
(Koc et al., 2013) Male rat whole body Cell phone RFR at calling or stand-by Oxidative stress detected at both
calling and stand-by exposures.
(Koylu et al., 2006) Rat whole body 900 MHz The levels of LPO in the brain
cortex and hippocampus
increased.These levels in the
hippocampus were decreased by
melatonin administration.
(Koyu et al., 2009) Rat whole body 900 MHz The activities of XO, CAT and
level of LPO increased in
liver.XO, CAT activities and
LPO levels were decreased by
caffeic acid phenethyl ester
(CAPE) administration.
(Kumar et al., 2014) Rat whole body Cell phone 1910.5 MHz RFR, 2 h/day
for 60 days day (6 days a week).
Increase in LPO, damage in sperm
cells and DNA damage.
(Lai & Singh, 1997) Rat whole body 2450 MHz, pulsed, PD ¼ 2 mW/cm
2
,
SAR ¼ 1.2 W/kg
Melatonin or spin-trap compound
blocked DNA strand breaks
induced by RFR exposure in rat
brain cells.
(Luo et al., 2014) Rat whole body 900 MHz imitated cell phone RFR,
4 h/day for 12 days
Contents of liver MDA and Nrf2
protein increased, contents of
liver SOD and GSH decreased.
(Mailankot et al., 2009) Rat whole body 900/1800 MHz,GSM,1 h/day for 28
days
Increase in LPO and decreased
GSH content in the testis and
epididymis.
(Manta et al., 2013) Drosophila whole body 1880–1900 MHz, DECT modulation,
SAR ¼ 0.009 W/kg, for 0.5–96 h
Increase in ROS levels in male and
female bodies, a quick response
in ROS increase in ovaries.
(Marzook et al., 2014) Rat whole body 900 MHz from cellular tower, 24 h/day
for 8 weeks
SOD and CAT activities were
reduced in blood, sesame oil
reversed the effect
(Meena et al., 2013) Rat whole body 2450 MHz, PDof 210 mW/cm
2
,
SAR ¼ 0.14 W/kg, 2 h/day for
45 days
Increased level of MDA and ROS
in testis. Melatonin prevented
oxidative stress.
(Megha et al., 2012) Rat whole body 900; 1800 MHz, PD of 170 mW/cm
2
,
SAR ¼ 0.6 mW/kg, 2 h/day, 5 days/
week for 30 days
The levels of the LPO and PO were
increased; the level of GSH was
decreased.
(Meral et al., 2007) Guinea pig whole body 890–915 MHz,from cell phone,
SAR ¼ 0.95 w/kg, 12 h/day for
30 days (11 h 45 min stand-by and
15 min spiking mode)
MDA level increased, GSH level
and CAT activity werede-
creased in the brain. MDA,
vitamins A, D
3
and E levels and
CAT enzyme activity increased,
and GSH level was decreased in
the blood.
(Motawi et al., 2014) Rat whole body Test cellphone RFR, SAR ¼ 1.13
W/kg, 2 h/day for 60 days
Increments in conjugated dienes,
protein carbonyls, total oxidant
status and oxidative stress index
along with a reduction of total
antioxidant capacity levels.
(Naziroglu & Gumral, 2009) Rat whole body 2450 MHz,60 min/day for 28 days Decrease of the cortex brain vita-
min A, vitamin C and vitamin E
levels.
(Naziroglu et al., 2012a) Rat whole body 2450 MHz, 60 min/day for 30 days LPO, cell viability and cytosolic
Ca
2+
values in dorsal root gan-
glion neurons were increased.
(Oksay et al., 2014) Rat whole body 2450 MHz, pulsed, PD of0.1 mW/cm
2
,
SAR ¼ 0.1 W/kg, 1 h/day for 30
days
LPO was higher in exposed ani-
mals. Melatonin treatment
reversed the effect.
(Oktem et al., 2005) Rat whole body 900 MHz, 30 min/day for 10 days Renal tissue MDA level increased,
SOD, CAT and GSH-Px activ-
ities were reduced. Melatonin
treatment reversed these effects.
(Oral et al., 2006) Rat whole body 900 MHz, 30 min/day for 30 days Increased MDA levels and apop-
tosis in endometrial
tissue.Treatment with vitamins
E and C diminished these
changes.
(continued )
8 I. Yakymenko et al. Electromagn Biol Med, Early Online: 1–16
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Table 2. Continued
Reference Biological system exposed RFR exposure
Statistically significant effects
reported*
(Ozguner et al., 2005a) Rat whole body 900 MHz, 30 min/day for 10 days Heart tissue MDA and NO levels
increased, SOD, CAT and GSH-
Px activities were reduced.
CAPE treatment reversed these
effects.
(Ozguner et al., 2006) Rat whole body 900 MHz, from cell phone Retinal levels of NO and MDA
increased, SOD, GSH-Px and
CAT activities were
decreased.Melatonin and CAPE
treatment prevented effects.
(Ozguner et al., 2005b) Rat whole body 900 MHz Renal tissue MDA and NO levels
increased, the activities of SOD,
CAT and GSH-Px were
reduced. CAPE treatment
reversed these effects.
(Ozgur et al., 2010) Guinea pig whole body 1800 MHz,GSM, SAR ¼ 0.38 W/kg,
10 or 20 min/day for 7 days
Increases in MDA and total NO(x)
levels and decreases in activ-
ities of SOD, myeloperoxidase
and GSH-Px in liver. Extent of
oxidative damage was propor-
tional to the duration of
exposure.
(Ozgur et al., 2013) Rabbit whole body 1800 MHz, pulsed, 15 min/day for
7 days in pregnant animals, for 7 or
15 days in infants
The amount of LPO was increased
in the prenatal exposure group.
(O
¨
zorak et al., 2013) Rat whole body 900; 1800; 2450 MHz, pulsed, PD of
12 mW/cm
2
.SAR ¼ 0.18; 1.2 W/kg,
60 min/day during gestation and
6 weeks following delivery
At the age of six weeks, an
increased LPO in the kidney
and testis, and decreased level
of GSH and total antioxidant
status.
(Qin et al., 2014) Male mouse whole body 1800 MHz, 208 mW/cm
2
,30or
120 min/d for 30 days
Decreased activities of CAT and
GSH-Px and increasedlevel of
MDA in cerebrum. Nano-sel-
enium decreased MDA level,
and increased GSH-Px and CAT
activities.
(Ragy, 2014) Rat whole body Cell phone 900 MHz RFR, 1 h/d for
60 days
Increase in MDA levels and
decrease total antioxidant cap-
acity levels in brain, liver and
kidneys tissues. These alter-
ations were corrected by with-
drawal of RFR exposure during
30 days.
(Saikhedkar et al., 2014) Rat whole body Cell phone 900 MHz RFR, 4 h/d for
15 days
A significant change in level of
antioxidant enzymes and non-
enzymatic antioxidants, and an
increase in LPO.
(Shahin et al., 2013) Mouse whole body 2450 MHz, PD of 33.5 mW/cm
2
,
SAR ¼ 23 mW/kg, 2 h/day for
45 days
An increase in ROS, decrease in
NO and antioxidant enzymes
activities.
(Sharma et al., 2009) Plant(mung bean) whole
body
900 MHz, from cell phone, PD of
8.55 mW/cm
2
; for 0.5; 1; 2, and 4 h
Increased level of MDA,H
2
O
2
accumulation and root oxidiz-
ability, upregulation in the
activities of SOD, CAT, ascor-
bate peroxidases, guaiacol per-
oxidases and GSHreductases in
roots.
(Singh et al., 2012) Plant (mung bean)
whole body
900 MHz,from cell phone The increased level of MDA,
hydrogen peroxide and proline
content in hypocotyls.
(Sokolovic et al., 2008) Rat whole body RFR from cell phone, SAR ¼ 0.043–
0.135 W/kg, for 20, 40 and 60 days
An increase in the brain tissue
MDA and carbonyl group con-
centration. Decreased activity
of CAT and increased activity
of xanthine oxidase (XO).
Melatonin treatment prevented
the effects.
(continued )
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significant overproduction of superoxide radical and NO
radical, increased rates of lipid peroxidation and oxidative
damage of DNA (Burlaka et al., 2013; Tsybulin et al.,
2012). Notably, shorter exposures instead led to enhance-
ment in embryonic development (Tsybulin et al., 2012,
2013). We demonstrated the favorable effects of shorter
exposures also on the molecular level. Thus, after the short-
time RFR exposure the DNA comets in embryonic cells
were significantly shorter than in the control non-irradiated
embryos, pointing to activation of mechanisms maintaining
the integrity of DNA. The ‘‘beneficial’’ consequences of the
irradiation could be explained by hormesis effect (Calabrese,
2008). However, one could hypothesize that the ‘‘benefi-
cial’’ effects of the irradiation could be explained by the
signaling action of free radicals induced at levels below the
damaging concentrations. Obviously, any seemingly benefi-
cial effect of external environmental impact should be
treated with caution and possibly minimized before careful
evaluation of the long-term consequences. Altogether,
this gives a clear warning of the adverse health effects of
Table 2. Continued
Reference Biological system exposed RFR exposure
Statistically significant effects
reported*
(Sokolovic et al., 2013) Rat whole body 900 MHz, SAR ¼ 0,043–0.135 W/
kg,4 h/day for 29; 40 or 60 days,
The level of LPO and PO, activ-
ities of CAT, XO, number of
apoptotic cells were increased
in thymus tissue. An adminis-
tration of melatonin prevented
these effects.
(Suleyman et al., 2004) Rat whole body Cell phoneRFR,SAR ¼ 0.52 W/
kg,20 min/day for 1 month
MDA concentration was increased
in brains.
(Tkalec et al., 2007) Plant Lemna minor
(duckweed)
400 and 900 MHz, 10, 23, 41 and
120 V/m, for 2 or 4 h
LPO and H
2
O
2
content increased:
CAT activity increased, pyro-
gallol peroxidase decreased.
(Tkalec et al., 2013) Earthworm whole body 900 MHz, PD of 30–3800 mW/cm
2
,
SAR ¼ 0.13–9.33 mW/kg, for 2 h
The protein carbonyl content was
increased in all exposures above
30 mWc/m
2
. The level of MDA
was increased at 140mW/cm
2
.
(To
¨
k et al., 2014) Rat whole body 2450 MHz, Wi-Fi RFR, 60 min/day for
30 days
Decreased GSH-Px activity. GSH-
Px activity and GSH values
increased after melatonin
treatment.
(Tomruk et al., 2010) Rabbit whole body 1800 MHz, GSM-like signal,
15 min/day for a week
Increase of MDA and ferrous oxi-
dation in xylenol orange levels.
(Tsybulin et al., 2012) Quail embryo in ovo 900 MHz, fromcell phone, GSM, PD
of 0.024–0.21 mW/cm
2
, intermittent
for 14 days
Increased level of TBARS in
brains and livers of hatchlings.
(Turker et al., 2011) Rat partial body 2450 MHz, pulsed,
SAR ¼ 0.1 W/kg,1 h/day for 28
days
The increased level of LPO, the
decreased concentrations of
vitamin A, vitamin C and vita-
min E. There was a protective
effect of selenium and L-
carnitine.
(Tu
¨
redi et al., 2014) Pregnant rat whole body 900 MHz, 13.7 V/m, 50 mW/cm
2
,
1 h/day for 13–21 days of
pregnancy
MDA, SOD and CAT values
increased, GSH values
decreased in exposed pups.
(Yurekli et al., 2006) Rat whole body 945 MHz, GSM, PD of 367 mW/cm
2
,
SAR ¼ 11.3 mW/kg
MDA level and SOD activity
increased, GSH concentration
was decreased.
*All effects were statistically significant (at least p50.05) as compared to control or sham exposed groups.
Table 3. Publications which reported positive findings on oxidative stress caused byRFR exposure of humans.
Reference Biological system exposed RFR exposure
Statistically significant effects
reported*
(Abu Khadra et al., 2014) Human male head GSM 1800 MHz from cell phone,
SAR ¼ 1.09 W/kg, for 15 and
30 min
SOD activity in saliva increased.
(Garaj-Vrhovac et al., 2011) Human whole body 3; 5.5; 9.4 GHz, pulsed, from radars Increased level of MDA, decreased
level of GSH.
(Hamzany et al., 2013) Human head/whole body RFR from cell phone a mean time
of 29.6 h/month for 12.5 years
Increase in all salivary oxidative
stress indices.
(Moustafa et al., 2001) Human male body Cell phone in a pocket in standby
position, for 1; 2 or 4 h
Plasma level of LPO was
increased, activities of SOD and
GSH-Px in erythrocytes decreased.
*All effects were statistically significant (at least p50.05) as compared to control or sham-exposed groups.
10 I. Yakymenko et al. Electromagn Biol Med, Early Online: 1–16
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low-intensity RFR, which could be evoked both by the direct
oxidative damage and by disturbed cellular signaling.
Oxidative effects and non-cancer health effects
of RFR
A new medical condition, so-called electrohypersensitivity
(EHS), in which people suffer due to RFR exposure, has been
described (Johansson, 2006). Typically, these persons suffer
from skin- and mucosa-related symptoms (itching, smarting,
pain, heat sensation), or heart and nervous system disorders
after exposure to computer monitors, cell phones and other
electromagnetic devices. This disorder is growing continu-
ously: starting from 0.06% of the total population in 1985, this
category now includes as much as 9–11% of the European
population (Hallberg and Oberfeld, 2006). In Sweden, for
example, EHS has become an officially recognized health
impairment.
To that, a high percentage, up to 18–43% of young people,
has recently been described to be suffering from headache/
earache during or after cell phone conversations (Chu et al.,
2011; Yakymenko et al., 2011). Likewise, a number of
psychophysical and preclinical disorders including fatigue,
irritation, headache, sleep disorders, hormonal imbalances
were detected in high percent of people living nearby cell
phone base transceiver stations (Buchner and Eger, 2011;
Santini et al., 2002).
An allergy reaction to RFR in humans has been confirmed
by a significant increase in the level of mast cells in skin of
persons under exposure to electromagnetic devices
(Johansson et al., 2001). Likewise, higher level of degranu-
lated mast cells in dermis of EHS persons has been detected
(Johansson, 2006). In turn, the activated mast cells can release
histamine and other mediators of such reactions which
include allergic hypersensitivity, itching, dermatoses, etc.
Importantly, an implication of ROS in allergic reactions is
rather clear nowadays. For example, in case of airway allergic
inflammation, the lung cells generate superoxide in nanomo-
lar concentrations following antigen challenges (Nagata,
2005). Then, mast cells generate ROS following aggregation
of Fc"RI, a high-affinity IgE receptor (Okayama, 2005). In
addition, pollen NADPH oxidases rapidly increase the level of
ROS in lung epithelium (Boldogh et al., 2005); and removal
of pollen NADPH oxidases from the challenge material
reduced antigen-induced allergic airway inflammation. Thus,
it seems plausible that EHS-like conditions can be attributed
at least partially to ROS overproduction in cells due to RFR
exposures.
Oxidative effects and potential carcinogenicity
of RFR
During recent years, a number of epidemiological studies
indicated a significant increase in incidence of various types
of tumors among long-term or ‘‘heavy’’ users of cellular
phones (Yakymenko et al., 2011). Briefly, reports pointed to
the increased risk in brain tumors (Cardis et al., 2010; Hardell
and Carlberg, 2009; Hardell et al., 2007), acoustic neuroma
(Hardell et al., 2005; Sato et al., 2011), tumors of parotid
glands (Sadetzki et al., 2008), seminomas (Hardell et al.,
2007), melanomas (Hardell et al., 2011) and lymphomas
(Hardell et al., 2005) in these cohorts of people. To that, a
significant increase in tumor incidence among people living
nearby cellular base transceiver stations was also reported
(Eger et al., 2004; Wolf and Wolf, 2007). Similarly, experi-
mental evidences of cancer expansion in rodents caused by
long-term low-intensity RFR exposure were published (Chou
et al., 1992; Repacholi et al., 1997; Szmigielski et al., 1982;
Toler et al., 1997). To that, activation of ODC was detected in
RFR-exposed cells (Hoyto et al., 2007). ODC is involved in
Table 4. Publications which reported no significant oxidative effectsafter RFR exposure.
Reference Biological system exposed RFR exposure Effects reported
(Hook et al., 2004) Mammalian cells in vitro 835.62 MHz (frequency-modulated
continuous-wave, FMCW) and
847.74 MHz (code division
multiple access, CDMA),
SAR ¼ 0.8 W/kg, for 20–22 h
FMCW- and CDMA-modulated RFR
did not alter parameters indicative of
oxidative stress.
(Ferreira et al., 2006a) Rat whole body 800–1800 MHz, from cell phone No changes in lipid and protein
damage, and in non-enzymatic anti-
oxidant defense in frontal cortex or
hippocampus.
(Ferreira et al., 2006b) Pregnant rat whole body RFR from cell phone No differences in oxidative parameter
of offspring blood and liver, but
increase in erythrocytes micronuclei
incidence in offspring.
(Dasdag et al., 2003) Rat whole body Cell phone RFR, SAR ¼ 0.52 W/kg,
20 min/day for 1 month
No alteration in MDA concentration.
(Demirel et al., 2012) Rat whole body 3G cell phone RFR, ‘‘standardized
daily dose’’ for 20 days
No difference in GSH-Px and CAT
activity in eye tissues, in MDA and
GSH levels in blood.
(Khalil et al., 2014) Human head/whole body Cell phone RFR (talking mode) for
15 or 30 min
No relationship between exposure and
changes in the salivary oxidant/anti-
oxidant profile.
(de Souza et al., 2014) Human head/whole body Cell phone RFR No difference in the saliva from the
parotid gland exposed to cell phone
RFR to the saliva from the opposite
gland of each individual.
DOI: 10.3109/15368378.2015.1043557 RFR as a powerful oxidative agent 11
Electromagn Biol Med Downloaded from informahealthcare.com by 178.54.177.229 on 07/07/15
For personal use only.
processes of cell growth and differentiation, and its activity is
increased in tumor cells. Although overexpression of ODC is
not sufficient for tumorigenic transformation, an increased
activity of this enzyme was shown to promote the develop-
ment of tumors from pre-tumor cells (Clifford et al., 1995).
Significant overproduction of ROS leads to oxidative stress
in living cells, induces oxidative damage of DNA and can
cause malignant transformation (Halliwell and Whiteman,
2004; Valko et al., 2007). It is known that in addition to
mutagenic effects, ROS play a role as a second messenger for
intracellular signaling cascades which can also induce
oncogenic transformation (Valko et al., 2006). Earlier we
hypothesized (Burlaka et al., 2013) that low-intensity RFR
exposure leads to dysfunctions of mitochondria, which result
in overproduction of superoxide and NO, and subsequently to
ROS-mediated mutagenesis. To that, it is well established that
oxidative stress is associated with carcinogenesis; for
instance, the oxidative stress elicited by Membrane-Type 1
Matrix Metalloproteinase is implicated in both the pathogen-
esis and progression of prostate cancer (Nguyen et al., 2011).
Similarly, a progressive elevation in mitochondrial ROS
production (chronic ROS) under both hypoxia and/or low
glucose, which leads to stabilization of cells via increased
HIF-2alpha expression, can eventually result in malignant
transformation (Ralph et al., 2010). These data, together with
the strong experimental evidences on activation of NADH
oxidase under RFR exposure (Friedman et al., 2007) suggest
that low-intensity RFR is a multifactorial stress factor for
living cell, significant feature of which is oxidative effects and
potential carcinogenicity as a result.
Conclusions
The analysis of modern data on biological effects of low-
intensity RFR leads to a firm conclusion that this physical
agent is a powerful oxidative stressor for living cell. The
oxidative efficiency of RFR can be mediated via changes in
activities of key ROS-generating systems, including mito-
chondria and non-phagocytic NADH oxidases, via direct
effects on water molecules, and via induction of conformation
changes in biologically important macromolecules. In turn, a
broad biological potential of ROS and other free radicals,
including both their mutagenic effects and their signaling
regulatory potential, makes RFR a potentially hazardous
factor for human health. We suggest minimizing the intensity
and time of RFR exposures, and taking a precautionary
approach towards wireless technologies in everyday
human life.
Acknowledgments
The authors are grateful to the unknown referees
for the valuable comments on the first version of the
manuscript.
Declaration of interest
The authors declare no conflicts of interest. This study was
supported by National Academy of Sciences of Ukraine (I.Y.,
E.S.) and by University of Campinas via PPVE (Programa
Professor Visitante do Exterior), Brazil (S.K.).
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  • ... There is a far-reaching history of research on the health effects of wireless radiation (Belpomme et al. 2018;Desai et al. 2009;Di Ciaula 2018;Doyon & Johansson 2017;Havas 2017;Kaplan et al. 2016;Kostoff & Lau 2013, 2017Lerchl et al. 2015;Levitt & Lai 2010;Miller et al. 2019;Pall 2016Pall , 2018Panagopoulos 2019;Panagopoulos et al. 2015;Russell 2018;Sage & Burgio 2018;Van Rongen et al. 2009;Yakymenko et al. 2016). Kostoff et al. (2020) summarize these findings reporting that exposure to radio frequency radiation below the American Federal Communications Commission guidelines can result in the genesis of several types of cancer, DNA and chromatin damage and/or dysfunction, mutagenesis, teratogenesis, neurodegenerative and neurocognitive disorders, reproductive problems, excessive reactive oxygen species/oxidative stress, inflammation, apoptosis, blood-brain barrier disruption, pineal gland/melatonin production dysfunction, sleep disturbance, headache, irritability, fatigue, concentration difficulties, depression, dizziness, tinnitus, burning and flushed skin, digestive disturbance, tremor, cardiac irregularities, and general dysfunction of the neural, circulatory, immune, endocrine, and skeletal systems. ...
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    A history of research on radio frequency radiation, and recent scant research on the newly emerging 5G suggests that the expansion of 5G poses a possible public health issue. The media play a decisive role in how the public responds to a public health issue, and what it knows about it. However, there is an increasing amount of misinformation on health topics in the media. The present case study investigated whether the Croatian news website Index.hr manipulates information on the health effects of 5G. We constructed one experimental corpus, containing all articles by Index.hr on health effects of 5G, and two control corpora, one with articles about health effects of 5G published by reliable mainstream media, and one with articles about science (but not 5G) published by Index.hr. We assessed the presence of references, scientific references, misinformation, opinion expression, and opinion subjectivity. Compared to Index.hr science articles, Index.hr 5G articles were 10.78 times likelier to contain no references, 4.20 times likelier to contain no scientific references, 10.78 times likelier to contain misinformation, 288.14 times likelier to express the author’s opinion on the issue, and 16.95 times likelier to express a subjective opinion. The simultaneous increase in misinformation and reduction in referencing suggests that misinformation doesn’t stem from other unreliable sources of information, but that the misinformation is produced within Index.hr. An increase in opinion expression, and opinion subjectivity in the context of misinformation suggests that Index.hr is manipulating the information on health effects of 5G. This is corroborated by the fact that the two types of misinformation identified in the present study included erroneous referencing, and denial of the existence of scientific literature on the topic. Furthermore, all articles on both 5G, and scientific topics were written by different authors, indicating that this phenomenon is systematic within Index.hr. We conclude that our data point to a manipulation of information on health effects of 5G by Index.hr. Still, the small sample size warrants a degree of caution.
  • ... A vast literature published over the past sixty years shows adverse effects from wireless radiation applied in isolation or as part of a combination with other toxic stimuli. Extensive reviews of wireless radiation-induced biological and health effects have been published (Kostoff andLau, 2013, 2017;Belpomme et al., 2018;Desai et al., 2009;Di Ciaula, 2018;Doyon and Johansson, 2017;Havas, 2017;Kaplan et al., 2016;Lerchl et al., 2015;Levitt and Lai, 2010;Miller et al., 2019;Pall, 2016Pall, , 2018Panagopoulos, 2019;Panagopoulos et al., 2015;Russell, 2018;Sage and Burgio, 2018;van Rongen et al., 2009;Yakymenko et al., 2016;Bioinitiative, 2012). In aggregate, for the high frequency (radiofrequency-RF) part of the spectrum, these reviews show that RF radiation below the FCC guidelines can result in: ...
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    This article identifies adverse effects of non-ionizing non-visible radiation (hereafter called wireless radiation) reported in the premier biomedical literature. It emphasizes that most of the laboratory experiments conducted to date are not designed to identify the more severe adverse effects reflective of the real-life operating environment in which wireless radiation systems operate. Many experiments do not include pulsing and modulation of the carrier signal. The vast majority do not account for synergistic adverse effects of other toxic stimuli (such as chemical and biological) acting in concert with the wireless radiation. This article also presents evidence that the nascent 5 G mobile networking technology will affect not only the skin and eyes, as commonly believed, but will have adverse systemic effects as well.
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    In the present lifestyle, we are continuously exposed to radiofrequency electromagnetic field (RF-EMF) radiation generated mainly by mobile phones (MP). Among other organs, our brain and hippocampus in specific, is the region where effect of any environmental perturbation is most pronounced. So, this study was aimed to examine changes in major parameters (oxidative stress, level of pro-inflammatory cytokines (PICs), hypothalamic-pituitary-adrenal (HPA) axis hormones, and contextual fear conditioning) which are linked to hippocampus directly or indirectly, upon exposure to mobile phone radiofrequency electromagnetic field (MP-RF-EMF) radiation. Exposure was performed on young adult male Wistar rats for 16 weeks continuously (2 h/day) with MP-RF-EMF radiation having frequency, power density, and specific absorption rate (SAR) of 1966.1 MHz, 4.0 mW/cm2, and 0.36 W/kg, respectively. Another set of animals kept in similar conditions without any radiation exposure serves as control. Towards the end of exposure period, animals were tested for fear memory and then euthanized to measure hippocampal oxidative stress, level of circulatory PICs, and stress hormones. We observed significant increase in hippocampal oxidative stress (p < 0.05) and elevated level of circulatory PICs viz. IL-1beta (p < 0.01), IL-6 (p < 0.05), and TNF-alpha (p < 0.001) in experimental animals upon exposure to MP-RF-EMF radiation. Adrenal gland weight (p < 0.001) and level of stress hormones viz. adrenocorticotropic hormone (ACTH) (p < 0.01) and corticosterone (CORT) (p < 0.05) were also found to increase significantly in MP-RF-EMF radiation-exposed animals as compared with control. However, alteration in contextual fear memory was not significant enough. In conclusion, current study shows that chronic exposure to MP-RF-EMF radiation emitted from mobile phones may induce oxidative stress, inflammatory response, and HPA axis deregulation. However, changes in hippocampal functionality depend on the complex interplay of several opposing factors that got affected upon MP-RF-EMF exposure.
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    The impact of electromagnetic waves on health has been clearly established by many studies in recent decades. No State, with the exception of Russia, takes any real precautions in terms of standards for the population. Conflicts of interest and political lies are used to hide the truth about the dangers of electromagnetic pollution. In addition, it would seem that other sources of radiation than the most well-known ones (mobile phones, digital enhanced cordless telecommunication (DECT) phones, bluetooth, base stations, Wi-Fi, 4G, 5G) come into play. A system such as HAARP (High-frequency Active Auroral Research Program), as well as directed wave beams (related to past and recent scandals) must be analyzed and considered in a comprehensive way to understand why the wave level is only increasing despite the considerable amount of scientific work demonstrating that the standards are not adequate to maintain public health. Thus, official documents show that the impact of electromagnetic waves is not only physical and biological. Indeed, the climate and the behavior of the population are also targeted.
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    Carcinogenesis is a complex, multistep process, involving accumulation of genetic and epigenetic alterations that confer a growth and/or survival advantage, through which cells gradually achieve unchecked growth and eventually become fully malignant and invasive. There are numerous sources of physical, chemical, and biological exposures that stem from endogenous and exogenous sources—including occupational settings—that can induce such genetic and epigenetic alterations. This damage is repaired through a high-fidelity DNA repair process that operates through multiple pathways, although the system is imperfect and varies by repair mechanism, potentially resulting in incorporation of DNA damage and epigenetic alterations. This chapter provides an introduction to mechanisms of environmental and occupational carcinogenesis and DNA repair, and provides examples of physical and chemical carcinogens and epigenetic effectors.
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    Purpose: Various sources of radiation including radiofrequency, electromagnetic radiation (EMR), low- dose X-radiation, low-level microwave radiation and ionizing radiation (IR) are indispensable parts of modern life. In the current review, we discussed the adaptive responses of biological systems to radiation with a focus on the impacts of radiation-induced oxidative stress (RIOS) and its molecular downstream signaling pathways. Materials and methods: A comprehensive search was conducted in Web of Sciences, PubMed, Scopus, Google Scholar, Embase, and Cochrane Library. Keywords included Mesh terms of “radiation”, “electromagnetic radiation”, “adaptive immunity”, “oxidative stress”, and “immune checkpoints”. Manuscript published up until December 2019 were included. Results: RIOS induces various molecular adaptors connected with adaptive responses in radiation exposed cells. One of these adaptors includes p53 which promotes various cellular signaling pathways. RIOS also activates the intrinsic apoptotic pathway by depolarization of the mitochondrial membrane potential and activating the caspase apoptotic cascade. RIOS is also involved in radiation-induced proliferative responses through interaction with mitogen-activated protein kinases (MAPks) including p38 MAPK, ERK, and c-Jun N-terminal kinase (JNK). Protein kinase B (Akt)/phosphoinositide 3-kinase (PI3K) signaling pathway has also been reported to be involved in RIOS-induced proliferative responses. Furthermore, RIOS promotes genetic instability by introducing DNA structural and epigenetic alterations, as well as attenuating DNA repair mechanisms. Inflammatory transcription factors including macrophage migration inhibitory factor (MIF), nuclear factor κB (NF-κB), and signal transducer and activator of transcription-3 (STAT-3) paly major role in RIOS-induced inflammation. Conclusion: In conclusion, RIOS considerably contributes to radiation induced adaptive responses. Other possible molecular adaptors modulating RIOS-induced responses are yet to be divulged in future studies.