工频磁场诱导肺成纤维细胞膜受体聚簇及噪声磁场的干预作用

目的 研究50Hz工频磁场对细胞膜表皮生长因子(EGF)和肿瘤坏死因子(TNF)受体聚簇的可能诱导作用,进一步说明二频磁场生物效应细胞信号起始部位及噪声磁场可能存在的干预作用。方法 将中国仓鼠肺成纤维细胞分别用EGF、TNF、O．4mT的工频磁场、噪声磁场或工频磁场与噪声磁场叠加的复合磁场处理一定时间后,以免疫组化方法标记细胞膜EGF及TNF受体,并用激光共聚焦显微镜观察分析细胞膜EGF及TNF受体的聚簇程度。结果 细胞经EGF及TNF处理5min后即可诱导相应受体的聚簇,0.4mT工频磁场辐照5min后也可诱导细胞膜EGF及TNF受体的聚簇,并均在15min时达到最大程度。然而相同强度的噪声磁场不能诱导细胞膜受体的聚簇。当等强度的噪声磁场与工频磁场叠加后,可以抑制工频磁场诱导的细胞膜。EGF及TNF受体聚簇。结论 50Hz工频磁场与相应配体一样,能诱导细胞膜EGF及TNF受体的聚簇,膜受体是电磁场可能的信号耦合位点之一。等强度的噪声磁场可干预工频磁场对细胞膜受体聚簇的诱导。

Superposition of noise magnetic fields inhibits clustering of fibroblast membrane surface receptors induced by 50 Hz magnetic fields in Chinese hamster lungs

Objective To study the possible induction effect of exposure to 50 Hz magnetic field (MF) on clustering of cell membrane surface receptors for epidermal growth factor (EGF) and tumor necrosis factor (TNF), the starting site of signals of biological effects, and its possible intervention effect. Methods Lung fibroblasts of Chinese hamster (CHL) were exposed to EGF, TNF, 0.4 mT 50 Hz MF, 0.4 mT noise MF, and 0.4 mT 50 Hz MF combined with 0.4 mT noise MF.Respectively, for different durations, following the treatment, EGF and TNF receptors on the cell membrane were marked by corresponding antibodies with immunohistochemical method, then observed under a confocal microscope. Results Clustering of cell membrane receptors could be induced 5 min after treatment with EGF and TNF, as well as with 50 Hz MF at 0.4 mT, which reached the peak in 15 min. While noise MF with the same intensity did not induce clustering of cell membrane receptors. Superposition of noise MF with the same intensity could inhibit clustering of cell membrane receptors induced by 50 Hz MF. Conclusion Clustering of EGF and TNF receptors on the cell membrane could be induced by 50 Hz MF, suggesting that membrane receptors would be one of the sites where MF signals coupled, and noise MF with the same intensity could inhibit these effects.