纳米二氧化钛对雄性小鼠生殖系统的影响

目的:研究纳米二氧化钛(TiO2)对雄性小鼠的在体作用,主要观察其对雄性小鼠生殖系统的影响。方法:45只6周龄的雄性ICR小鼠随机均分3组,实验组隔日腹腔注射纳米TiO2(200mg/kg或500mg/kg),对照组注射等体积生理盐水,共给药5次。停药1周后,测量心脏、肝、肾、脾、睾丸和附睾的脏器系数,血清生化指标、睾酮和雌二醇水平;显微镜下观察附睾精子数量、活率、畸形率和睾丸内精子计数;主要脏器作病理切片和HE染色,TUNEL法检测睾丸生殖细胞凋亡。结果:与对照组相比,给药200mg/kg纳米TiO2组上述指标均无明显改变(P>0.05);给药500mg/kg组小鼠的心、肝和肾质量系数显著降低(P<0.05);丙氨酸氨基转移酶(ALT)、丙氨酸氨基转移酶/天门冬氨酸氨基转移酶(ALT/AST)、尿素氮(BUN)均显著升高(P均<0.05);附睾精子数、精子活率以及睾丸内精子计数均显著降低,精子畸形率增高,睾丸生殖细胞凋亡明显增多(P均<0.05)。肝、肾、脾、睾丸和附睾的病理切片观察未见明显改变。结论:小剂量的纳米TiO2对雄性小鼠无明显影响,较大剂量的纳米TiO2对雄性小鼠肝、肾功能有轻度影响,对小鼠精子生成和精子功能有明显影响,并诱导睾丸生殖细胞凋亡。

Effects of Nanosized Titanium Dioxide on the Reproductive System of Male Mice

Objective:To investigate the in vivo effects of nanosized titanium dioxide (TiO2) on the main organs, particularly the reproductive system, of male mice. Methods: Forty-five male ICR mice aged 6 weeks were equally and randomly divided into 2 experimental groups and a control group, intraperitoneally injected with 200 and 500 mg/kg nanosized TiO2 and equal volume of saline, respectively, every other day for 5 times. One week after drug cessation, we obtained the coefficients of the main organs, serum biochem...