染氟大鼠生精细胞凋亡和血清雌二醇水平的关系

Relationship between spermatogenic cell apoptosis and serum estradiol level in rats exposed to fluoride

目的探讨染氟大鼠生精细胞凋亡和血清雌二醇水平的关系。方法雄性Wistar大鼠30只,随机分为6组,即对照28d组、低剂量染毒28d组、高剂量染毒28d组、对照38d组、低剂量染毒38d组和高剂量染毒38d组。通过腹腔注射NaF溶液的方法建立氟中毒模型,采用酸浸-氟离子选择电极法测定睾丸氟含量,放射免疫的方法检测血清雌二醇水平,采用TUNEL方法检测凋亡的生精细胞。结果随着染毒剂量加大和时间延长,染氟大鼠血清雌二醇水平显著下降(P<005),睾丸氟含量显著升高(P<005),生精细胞凋亡率显著升高(P<005),且血清雌二醇水平与睾丸氟含量和生精细胞凋亡率均呈负相关(P<005)。结论氟在一定剂量和作用时间内可致血清雌二醇水平紊乱,是导致生精细胞凋亡的重要原因之一。

Objective To observe the relationship between spermatogenic cell apoptosis and serum estradiol level in rats exposed to fluoride. Methods A total of 30 male Wistar rats were allocated into six groups randomly. The six experimental groups were 28-day control group, 28-day low-dose fluoride treatment group, 28-day high-dose fluoride treatment group, 38-day control group, 38-day low-dose fluoride treatment group, and 38-day high-dose fluoride treatment group. The fluorosis model was acquired by subcutaneous injection of NaF solution. The content of NaF in testis was measured by using fluorine selective electrode. The serum estradiol level was radioimmunochemically detected. And the apoptotic spermatogenic cells were quantitatively measured by TUNEL. Results The content of NaF in testis and the ratio of apoptotic spermatogenic cell in fluoride treatment groups significantly increased with increased experimental dosage and prolonged experimental period (P<0.05). Meanwhile, the serum estradiol level significantly decreased (P<0.05), which was negatively correlated with the content of NaF in testis as well as the ratio of apoptotic spermatogenic cell (P<0.05). Conclusion Excessive fluoride could lead disturbance to serum estradiol level during some range of dose and time, which is an important factor to spermatogenic cell apoptosis.