Wetenschappelijk nieuws

Exposure to 900MHz electromagnetic fields activates the mkp-1/ERK pathway and causes blood-brain barrier damage and cognitive impairment in rats

 

PubMed - Brain Res. 2015 Jan

 

Abstract - With the rapid increase in the number of mobile phone users, the potential adverse effects of the electromagnetic field radiation emitted by a mobile phone has become a serious concern. This study demonstrated, for the first time, the blood-brain barrier and cognitive changes in rats exposed to 900MHz electromagnetic field (EMF) and aims to elucidate the potential molecular pathway underlying these changes. (...) We found that the frequency of crossing platforms and the percentage of time spent in the target quadrant were lower in rats exposed to EMF for 28 days than in rats exposed to EMF for 14 days and unexposed rats. Moreover, 28 days of EMF exposure induced cellular edema and neuronal cell organelle degeneration in the rat. In addition, damaged BBB permeability, which resulted in albumin and HO-1 extravasation were observed in the hippocampus and cortex. Thus, for the first time, we found that EMF exposure for 28 days induced the expression of mkp-1, resulting in ERK dephosphorylation. Taken together, these results demonstrated that exposure to 900MHz EMF radiation for 28 days can significantly impair spatial memory and damage BBB permeability in rat by activating the mkp-1/ERK pathway.

 

 

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Self-Reporting of Symptom Development From Exposure to Radiofrequency Fields of Wireless Smart Meters in Victoria, Australia

 

PubMed - In 2006, the government in the state of Victoria, Australia, mandated the rollout of smart meters in Victoria, which effectively removed a whole population's ability to avoid exposure to human-made high-frequency nonionizing radiation. This issue appears to constitute an unprecedented public health challenge for Victoria. By August 2013, 142 people had reported adverse health effects from wireless smart meters by submitting information on an Australian public Web site using its health and legal registers.

 

Results - The most frequently reported symptoms from exposure to smart meters were (1) insomnia, (2) headaches, (3) tinnitus, (4) fatigue, (5) cognitive disturbances, (6) dysesthesias (abnormal sensation), and (7) dizziness. The effects of these symptoms on people's lives were significant.

 

Conclusions - Review of some key studies, both recent and old (1971), reveals that the participants' symptoms were the same as those reported by people exposed to radiofrequency fields emitted by devices other than smart meters. Interestingly, the vast majority of Victorian cases did not state that they had been sufferers of electromagnetic hypersensitivity syndrome (EHS) prior to exposure to the wireless meters, which points to the possibility that smart meters may have unique characteristics that lower people's threshold for symptom development.

 

 

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'Personal exposure meters' onderschatten de werkelijke blootstelling

 

Personal exposure meters underestimate the exposure of humans to non-ionizing radiation in indoor environments.

de Miguel-Bilbao et al. Assessment of human body influence on exposure measurements of electric field in indoor enclosures. Bioelectromagnetics. 2014 Nov 14. (PubMed)

Personal exposure meters (PEMs) used for measuring exposure to electromagnetic fields (EMF) are typically used in epidemiological studies. As is well known, these measurement devices cause a perturbation of real EMF exposure levels due to the presence of the human body in the immediate proximity. This paper aims to model the alteration caused by the body shadow effect (BSE) in motion conditions and in indoor enclosures at the Wi-Fi frequency of 2.4 GHz.

It has been found that the influence of the presence of the human body can be characterized as an angle of shadow that depends on the dimensions of the indoor enclosure.

 

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Low intensity radiofrequency radiation: a new oxidant for living cells

 

ScopeMed (Open Access)

 

Extract: "A number of experimental studies demonstrate metabolic effects induced by low intensity RFR  [15-17]. Notwithstanding the non-ionizing nature of RFR, profound mutagenic effects and features of significant oxidative stress in living cells under low  intensity RFR exposure were detected using various biological models [18, 19]. Some of the papers however still show an absence of biological effects [20]. To clarify the picture, we analyzed peer-reviewed publications on oxidative effects of RFR and found altogether 80 currently available papers, of which a remarkable part, 76 papers (92.5%), reported the detection of significant oxidative stress..."

 

"Whatever the particular first-step molecular mechanisms, it is clear that the substantial overproduction of ROS in living cells under low intensity RFR exposure could cause a broad spectrum of health disorders and diseases, including cancer in
humans. Undoubtedly, this calls for the further intensive research in the area, as well as to a precautionary approach in routine usage of wireless devices."

 

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Voltage-gated calcium channels: replace ICNIRP’s “fictional” heating limits

 

Professor Pall’s important 2013 review (J Cell Mol Med.), showing one mechanism by which EM exposure affects cells, is on the list of Global Medical Discoveries of 2nd March. Pall’s new paper advocates improving microwave exposure limits in two ways: (a) reduce exposure levels by 100 to 1,000 times immediately; (b) introduce biologically-based safety tests. Over 20,000 studies show EM effects below current heating-based safety limits. Fictional heating limits are no longer relevant.

 

Bron: ES-UK Newsletter November 2014

 

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Reliability of Swedish Brain Tumor Data Questioned

 

microwavenews.com - Are Rates Actually Increasing?

 

Some leading epidemiologists have been saying that cell phones don’t pose a brain tumor risk because cancer rates are not going up. Now comes word that Swedish cancer registry data are in disarray and official statistics may be masking a disquieting trend.

Since 2008, there has been a close to 30% increase in patients with a brain tumor of an “unknown nature” and that increase is not reflected in the national cancer registry, according to a new analysis by Mona Nilsson, a Swedish journalist and the chairman of the Swedish Radiation Protection Foundation.

 

Nilsson reports that the number of Swedes who died of a brain tumor of an unknown nature rose by 157% between 2008 and 2013. And among those younger than 70, the increase was even “more pronounced” — there were 82 such deaths in 2013, compared to only 7 in 2008. Yet, Nilsson adds, “the number of patients reported dead of brain tumors with a confirmed diagnosis declined” during that same period.

 

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