Reale Marcella, D'Angelo Chiara, Costantini Erica, Tata Ada Maria, Regen Francesca, Hellmann-Regen Julian
Department of Medical, Oral and Biotechnological Sciences, Unit of Immunodiagnostic and Molecular Pathology, University "G. D'Annunzio", Via dei Vestini, 31, 66123 Chieti, Italy.
CNS Neurol Disord Drug Targets. 2016;15(10):1203-1215. doi: 10.2174/1871527315666160920113407.
Exposure to environmental extremely low-frequency electromagnetic fields (ELF-EMF) in everyday life is increasing and it is a matter of great debate whether exposure to ELF-EMF can be harmful to human health. The neuropathology and symptoms of neurodegenerative disease depends on factors other than genetic predispositions, such as environmental exposure to disease-related risk factors. Research focusing on a possible contribution of ELF-EMF to cell injury and to the development of neurodegenerative disorders is characterized by conflicting data from epidemiological and animal studies. Due to lack of a direct link between neurodegenerative processes and ELF-EMF exposure, our goal was to investigate if ELF-EMF exposure may represent a possible risk factor. In the present study, using neuronal-like SH-SY5Y neuroblastoma cells, we show that the balance between generation and elimination of reactive oxygen species, as well as the balance between pro- and anti-inflammatory cytokines linked to oxidative stress, was maintained ensuring that cells respond properly to ELF-EMF (50Hz /1mT). In SH-SY5Y-exposed cells we observed increased intracellular 5-hydroxyindoleacetic acid/5-hydroxytryptamine ratio reflecting the rate of transmitter synthesis, catabolism and release, while matrix metalloproteinases that play critical roles in neuronal cell death were not significantly altered. The results presented here indicate that changes caused by short (1h-3h) and sub-chronic (48 h) exposure to 50Hz/1mT ELF-EMF in SH-SY5Y cells are minor in comparison to the neuronal cell damage expected to underlie neurodegeneration or cognitive impairment. Thus, these results are in accord with epidemiological studies that have provided little support for a link between ELF-EMFs and neurodegeneration.
在日常生活中,人们接触环境极低频电磁场(ELF - EMF)的情况日益增加,而ELF - EMF暴露是否会对人体健康有害是一个备受争议的问题。神经退行性疾病的神经病理学和症状取决于遗传易感性以外的因素,例如环境中接触与疾病相关的风险因素。聚焦于ELF - EMF对细胞损伤和神经退行性疾病发展可能影响的研究,其流行病学和动物研究数据相互矛盾。由于神经退行性过程与ELF - EMF暴露之间缺乏直接联系,我们的目标是研究ELF - EMF暴露是否可能是一个潜在风险因素。在本研究中,我们使用类神经元的SH - SY5Y神经母细胞瘤细胞,发现活性氧生成与清除之间的平衡,以及与氧化应激相关的促炎和抗炎细胞因子之间的平衡得以维持,确保细胞能对ELF - EMF(50Hz /1mT)做出适当反应。在暴露于ELF - EMF的SH - SY5Y细胞中,我们观察到细胞内5 - 羟吲哚乙酸/5 - 羟色胺比值升高,这反映了神经递质合成、分解代谢和释放的速率,而在神经元细胞死亡中起关键作用的基质金属蛋白酶没有显著变化。此处呈现的结果表明,与预期导致神经退行性变或认知障碍的神经元细胞损伤相比,SH - SY5Y细胞短期(1h - 3h)和亚慢性(48 h)暴露于50Hz/1mT ELF - EMF所引起的变化较小。因此,这些结果与流行病学研究一致,后者几乎没有为ELF - EMF与神经退行性变之间的联系提供支持。
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