Abstract
目的 探讨高功率微波(HPM)辐射后心脏β1肾上腺素能受体(β1-AR)和M2胆碱能受体(M2-AchR)表达的变化及其意义.方法采用平均功率密度为2～90mW/cm2的S波段HPM模拟源辐照150只Wistar雄性大鼠,应用光镜、免疫组织化学和图像分析技术,定量研究HPM辐照后大鼠心脏组织结构的改变及β1-AR和M2-AchR的表达变化规律.结果10 mW/cm2以上的HPM辐射后大鼠心肌纤维排列紊乱,出现颗粒变性甚至肌质凝聚,窦房结P细胞坏死,Purkinje纤维溶解等,且呈一定的剂量-效应关系(r=0.968,P＜0.05);于照后1 d大鼠左心室心内膜下及肌层心肌细胞膜和胞浆β1-AR表达增强,3 d达高峰,与假照射组相比,差异有统计学意义(P＜0.05),14 d逐渐恢复至正常水平;于照后1 d大鼠左心室心内膜下及肌层心肌细胞膜和胞浆M2-AchR表达明显增强并达高峰,与假照射组相比,差异有统计学意义(P＜0.01),14 d逐渐恢复至正常水平.结论一定功率密度的HPM辐射可造成大鼠心脏组织结构的损伤、左心室心内膜下及肌层心肌细胞β1-AR和M2-AchR表达增强,β1-AR和M2-AchR参与了HPM辐射所致心脏损伤的病理生理过程。
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