高功率微波对家兔视网膜睫状神经营养因子蛋白表达的影响

目的探讨高功率微波（HPM）急性辐照后,家兔视网膜组织睫状神经营养因子（CNTF）的蛋白表达量在不同时间的变化以及CNTF的分布,寻找HPM急性辐照后CNTF蛋白的变化规律。方法采用免疫组化以及半定量检测的方法检测90 W／cm^2、15 min辐照后0、3、6、12、24、72 h各个不同时相点家兔视网膜组织CNTF的蛋白表达变化及分布。结果CNTF在视网膜全层均有表达,主要分布于视网膜组织的细胞膜和胞浆中,而胞核染色不明显。CNTF蛋白表达在HPM辐照后有不同程度的变化,辐照后即刻下降约14％,而在6 h表达上调22％,并达到峰值水平,随后维持在对照水平。结论HPM急性辐照能即刻影响家兔视网膜CNTF蛋白的表达,其表达量与损伤时间之间存在时效关系。HPM辐照引起的CNTF表达变化可能参与了微波辐照所致的家兔视网膜组织损伤,为利用外源型CNTF治疗微波辐照所致的家兔视网膜组织损伤提供理论依据。

Effects of high power microwave exposure on cholinergic neurotrophic factors protein in rabbit retina

Objective To investigate the changes of cholinergic neurotrophic factors(CNTF) protein at different time points and the distribution of CNTF in rabbit retina after exposure to high power microwave (HPM), in order to determine the changes rule of CNTF protein. Methods The rabbits were irradiated by HPM (peak power 90 W/cm2) for 15 min respectively, and then killed at 0, 3, 6, 12, 24 and 72 h after irradiation. The changes of CNTF protein were investigated by immunohistrochemistry and semi-quantity analysis. Results CNTF protein was distributed in full retinal layers, special in the cell membrane and cytoplasm. HPM irradiation could immediately down-regulated CNTF protein expression at 0 h, up-regulated and arrived at peak level at 6 h(P<0.05 vs 0h group), and then kept control level. Conclusion HPM may cause acute retinal injure and change the expression of CNTF protein in rabbit retina. These effects show the time-dependent feature. These results suggest that CNTF activation plays a central role in the retinal injures induced by HPM, and supplies a therapy method by using foreign-aid CNTF to remedy the retinal injure induced by HPM.