Abstract
Since 2007, resonant coupling wireless power transfer (WPT) technology has been attracting attention and has been widely researched for practical use. Moreover, dosimetric evaluation has also been discussed to evaluate the potential health risks of the electromagnetic field from this WPT technology based on the International Commission on Non-Ionizing Radiation Protection (ICNIRP) guidelines. However, there has not been much experimental evaluation of the potential health risks of this WPT technology. In this study, to evaluate whether magnetic resonant coupling WPT induces cellular stress, we focused on heat shock proteins (Hsps) and determined the expression level of Hsps 27, 70 and 90 in WI38VA13 subcloned 2RA human fibroblast cells using a western blotting method. The expression level of Hsps under conditions of magnetic resonant coupling WPT for 24 h was not significantly different compared with control cells, although the expression level of Hsps for cells exposed to heat stress conditions was significantly increased. These results suggested that exposure to magnetic resonant coupling WPT did not cause detectable cell stress.
Highlights
Wireless power transfer (WPT) is useful technology for supplying power without cables connected to a power source, and will lead to downsizing, battery-less operation and enhanced mobility
We evaluated the expression of heat shock proteins (Hsps) 27, 70 and 90 in WI38VA13 subcloned 2RA
The increase in expression of Hsps is related to the activation of the heat shock transcription factor (HSF), which regulates the expression of Hsps, and binds to the heat shock element (HSE) on heat shock genes
Summary
Wireless power transfer (WPT) is useful technology for supplying power without cables connected to a power source, and will lead to downsizing, battery-less operation and enhanced mobility. In 2007, Kurs et al [2] suggested a new WPT technology using the resonant coupling phenomenon This new WPT technology transfers power between two pairs of coils with electromagnetic fields (EMFs), similar to electromagnetic induction technology, but can extend the power transfer distance at only the resonant frequency of the coils, and has been experimentally demonstrated to transfer power to a 60-W light bulb across a distance of 2 m with approximately 40% efficiency using self-resonant helical coils at approximately a 10-MHz resonant frequency. Induction heating cookers and mobile phones, which are primary examples of EMF-related technology, have been studied extensively using both dosimetric and experimental methods to evaluate their potential health risks [6,7,8,9,10,11]. Hsps 27, 70 and 90 under the conditions of magnetic resonant coupling WPT with 12.5-MHz resonant coupling frequency to investigate whether exposure to magnetic resonant coupling WPT induces cellular stress
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