The Effect of 1800 MHz Radio Frequency Electromagnetic Field Exposure on the Expression of GFAP，NCAM and GABA Receptors in Hippocampus of Rats
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摘要:
目的 探究 1800 MHz射频电磁场对大鼠的体重和海马体胶原纤维酸性蛋白（GFAP）、神经细胞黏附分子（NCBA）和γ-氨基丁酸（GABA）受体表达的影响。方法 购买SD大鼠14只，分为暴露组和对照组，暴露组雌雄比例3∶4，对照组雌雄比例4∶3。暴露频率 1800 MHz，强度0.5 mW/cm2。全身暴露3周，每天12 h（20:00～08:00）。暴露结束后，对2组老鼠分别称重。应用免疫组织化学技术对大鼠海马组织切片GFAP、NCBA、GABA受体进行染色，并测定GFAP、NCBA和GABA受体在海马CA1、CA3和DG区的表达变化。结果 暴露组与对照组体重指标无明显不同（P > 0.05）；暴露组海马CA1区、DG区GFAP的表达下降（ P < 0.05），其他各组比较无明显不同（ P > 0.05）。 结论 在 1800 MHz，0.5 mW/cm2射频电磁场使SD大鼠暴露3周，大鼠海马CA1和DG区GFAP表达下降，可能对某些脑部疾病有所影响。Abstract:Objective To explore the effects of 1800 MHz radio frequency electromagnetic fields on the body weight and expression of Glial fibrillary acidic protein （GFAP）, Neural Cell Adhesion Molecule （NCAM） and Gamma-Amino Butyric Acid （GABA） receptors in hippocampus of rats.Methods 14 SD rats were divided into the exposure group and the control group and the ratio of male to female was 3∶4 in the exposure group and 4∶3 in the control group. Exposure frequency 1800 MHz, intensity of 0.5 mW/cm2 RF field. Systemic exposure to three weeks, 12 hours a day （20:00-08:00）. After the exposure, the rats in the two groups were weighed respectively. Immunohistochemical techniques hippocampus GFAP stained sections, and GFAP NCAM and GABA receptors expression was measured in the hippocampus CA1, CA3 and DG （dentate gyrus）regions.Results The exposure group and the control group showed no significant difference in the body weight （P > 0.05）; the expression of GFAP in the CA1 and DG areas of the hippocampus decreased （ P < 0.05）, and there was no statistical significance in the other groups （ P > 0.05）. Conclusion At a frequency of 1800 MHz, an intensity of 0.5 mW/cm2 RF electromagnetic field SD rats are exposed for 3 weeks in rat hippocampal CA1 region and DG GFAP expression decreased, which may affect certain brain diseases.-
Key words:
- Radiofrequency electromagnetic field /
- Physiological growth /
- Hippocampus
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图 1 GFAP在大鼠海马各区的表达（SP法染色，×400）
A：GFAP在暴露组大鼠海马CA1区表达；B：GFAP在暴露组大鼠海马CA3区表达；C：GFAP在暴露组大鼠海马DG区表达；D：GFAP在对照组大鼠海马CA1区表达；E：GFAP在对照组大鼠海马CA3区表达；F：GFAP在对照组大鼠海马DG区表达。
Figure 1. Expression of GFAP in rat hippocampus（SP，×400）
图 2 NCAM在大鼠海马各区的表达（免疫组化SP法染色，×400）
A：NCAM在暴露组大鼠海马CA1区表达；B：NCAM在暴露组大鼠海马CA3区表达；C：NCAM在暴露组大鼠海马DG区表达；D：NCAM在对照组大鼠海马CA1区表达；E：NCAM在对照组大鼠海马CA3区表达；F：NCAM在对照组大鼠海马DG区表达。
Figure 2. The expression of NCAM in rat hippocampus（SP，×400）
图 3 GABA在大鼠海马各区表达（免疫组化SP法染色，×400）
A：GABA在暴露组大鼠海马CA1区表达；B：GABA在暴露组大鼠海马CA3区表达；C：GABA在暴露组大鼠海马DG区表达；D：GABA在对照组大鼠海马CA1区表达；E：GABA在对照组大鼠海马CA3区表达；F：GABA在对照组大鼠海马DG区表达。
Figure 3. The expression of GABA in rat hippocampus（SP，×400）
表 1 大鼠一般情况分析（ $ \bar x \pm s $）
Table 1. General situation analysis of rat （ $ \bar x \pm s $）
分组 动物数（n） 性别（雌/雄） 体重（g） t/P 暴露组 7 3/4 223.50 ± 35.94 t= −0.49 对照组 7 4/3 215.57 ± 34.51 P= 0.633 
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表 2 大鼠海马不同区域的GFAP表达MOD值（ $ \bar x \pm s $）
Table 2. MOD value of GFAP expression in different regions of rat hippocampus （ $ \bar x \pm s $）
分组 动物数（n） CA1区 CA3 DG区 暴露组 7 0.07 ± 0.06* 0.11 ± 0.05 0.07 ± 0.06* 对照组 7 1.50 ± 0.52 0.05 ± 0.06 1.50 ± 0.51 t = −3.349 t = −1.894 t = −3.809 P = 0.006 P = 0.083 P = 0.002 与对照组相比，*P < 0.05。
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表 3 大鼠海马不同区域的NCAM表达MOD值（ $ \bar x \pm s $）
Table 3. MOD value of NCAM expression in different regions of rat hippocampus（ $ \bar x \pm s $）
分组 动物数（n） CA1区 CA3 DG区 暴露组 7 0.05 ± 0.03 0.03 ± 0.02 0.05 ± 0.02 对照组 7 0.04 ± 0.03 1.50 ± 0.52 0.06 ± 0.03 t = 0.591 t = −0.200 t = −1.100 P = 0.565 P = 0.854 P = 0.293
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表 4 大鼠海马不同区域的GABA表达MOD值（ $ \bar x \pm s $）
Table 4. MOD value of GABA expression in different regions of rat hippocampus （ $ \bar x \pm s $）
分组 动物数（n） CA1区 CA3 DG区 暴露组 7 0.07 ± 0.04 0.07 ± 0.03 0.03 ± 0.02 对照组 7 0.05 ± 0.04 0.04 ± 0.02 0.05 ± 0.05 t = 0.550
t = 1.662 t = −0.870 P = 0.593 P = 0.131 P = 0.402
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