Many studies showed that oxidative stress is a crucial cause for the damage of liver function in vivo or in cells induced by the exposure of electromagnetic fields 24 , Li et al. Emre et al. In this study, the activity of SOD in exposure group was increased significantly after exposure to SEF with intensity of Nevertheless, during exposure to SEF with intensity of It suggested that although the exposure to SEF induced a temporary oxidative stress response in liver, it did not result in an oxidative damage, which was consistent with the test results of liver function indices ALT and AST in this study.
A possible reason for this result is fact that the liver antioxidative capacity of mice was enhanced through the overcompensation of body, which prevented the liver from an obvious oxidative damage.
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Under further exposure to SEF with intensity of This hypothesis was consistent with the increase of SOD activity in mice after short-term exposure of SEF in this study. Destefanis et al.
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Wu et al. Iorio et al. Obviously, the exposure of electromagnetic field could change the mitochondrial membrane potential of different cells. Liu 38 showed that when the mitochondrial membrane potential exceeds a threshold, the cytochrome b can not be oxidized by b Of course, more experiments should be designed and be carried out to verify this biological mechanism. In this study, under exposure to SEF with intensities of Probably, the cause of this result is that SEF with intensities of However, Cieslar et al.
The difference of two results could be mainly attribute to the variance in experimental animals and daily exposure duration. The indirect influence of surface charges, such as piloerection and cutaneous stimulation, is another possible explanation of SEF biological effects When organisms were exposed to SEF, not only polarized charges will come into being on the surface of skin but also charged ions in body fluids will migrate directionally to the surface of skin.
With the increase of SEF intensity, surface charges including polarized charges and charged ions above will accumulate on the surface of skin. Ultimately, it will cause piloerection and cutaneous stimulation, and further lead to anxiety and other psychological effects. This phenomenon is evident in mice and other hirsute animals particularly The perception thresholds of different organisms for this stimulation caused by surface charges were different. Blondin et al. Creim et al. Mice and rats are both hirsute animals and their perception thresholds of SEF could be similar approximately.
Thus, the intensities of SEF of Of course, it should be noted that the lack of power in results of this study probably led to that non-significant difference between the exposure group and sham exposure group was false negative result. It could be further confirmed through additional animal experiments with a larger sample size. From three analyzed intensities of SEF, only exposure to highest intensity of Under exposure to SEF with lower intensities of Exposure to SEF with intensity of More experiments with a larger sample size should be designed to verify the effect of SEF exposure on liver function, especially on mitochondrial membrane potential and its threshold, with special regard to longer exposure time exceeding 35 days.
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The phorbol myristate acetate PMA -induced oxidative burst in rat peritoneal neutrophils is increased by a 0. FEBS Letters. Valberg, P. Radiation Research.
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