电磁脉冲辐射对小鼠睾丸间质细胞结构和功能的影响

目的 :探讨电磁脉冲 (EMP)辐射对小鼠睾丸间质细胞结构和功能的影响。　方法 :6～ 8周龄二级昆明雄性小鼠 1 1 4只 ,随机分为辐射组 (1 0 8只 )和对照组 (6只 )。辐射组小鼠分别接受 8× 1 0 3、2× 1 0 4 、6× 1 0 4 V/m 3种不同场强EMP 5次重复全身辐射 ,并于辐射后 6h、1d、3d、7d、1 4d和 2 8d应用光镜、电镜观察睾丸间质细胞组织学及超微结构的改变 ,放射免疫法检测小鼠血清睾酮 (T)、黄体生成素 (LH)及雌二醇 (E2 )的浓度。　结果 :3种不同场强EMP辐射后 2 8d内小鼠睾丸间质细胞主要病变表现为细胞水肿和空泡变性 ,胞质线粒体肿胀、数目减少 ,内质网扩张 ,脂滴增多 ,大多数脂滴着色变浅 ,部分或完全排空 ;血清T与对照组相比较均呈不同程度的降低 ,分别在辐射后 6h～ 1 4d、6h～ 7d、1～ 2 8d时显著降低 (P <0 .0 5或P <0 .0 1 ) ,而LH和E2均未发生明显改变。　结论 :睾丸间质细胞是EMP辐射敏感的靶细胞之一 ,EMP辐射可引起小鼠睾丸间质细胞结构和功能的损伤 ,既有早期影响 ,又表现为持续效应 ,可能影响性功能和生精过程

Effect of Electromagnetic Pulse Irradiation on Structure and Function of Leydig Cells in Mice

OBJECTIVE: To explore the effect of electromagnetic pulse (EMP) irradiation on structure and function of Leydig cells in mice. METHODS: One hundred and fourteen male Kunming mice were randomly divided into irradiated and control group, the former radiated generally by 8 x 10(3) V/m, 2 x 10(4) V/m and 6 x 10(4) V/m EMP respectively five times within two minutes. Pathological changes of Leydig cells were observed by light and electron microscope. Serum testosterone (T), luteinizing hormone (LH) and estradiol (E2) were measured dynamically by radioimmunoassay at 6 h, 1 d, 3 d, 7 d, 14 d and 28 d after irradiation. RESULTS: Main pathological changes were edema and vacuolation, swelling of cytoplasmic mitochondria, reduce of lipid droplets, pale staining of most of lipid droplets, and partial or complete cavitation of lipid droplets in Leydig cells within 28 days after EMP radiation. Compared with normal controls, serum T decreased in all in different degrees within 28 days, and dropped significantly at 6 h-14 d, 6 h-7 d and 1 d-28 d after 8 x 10(3) V/m, 2 x 10(4) V/m and 6 x 10(4) V/m EMP irradiation(P < 0.05 or P < 0.01). EMP irradiation caused no significant changes in serum LH and E2. CONCLUSIONS: Leydig cells are among those that are the most susceptible to EMP irradiation. EMP irradiation may cause significant injury in structure and function of Leydig cells in mice, whose earlier and continuous effect is bound to affect sexual function and sperm production.