摘要
目的探讨微米和纳米级SiO2对雄性大鼠生殖功能的影响。方法将Wistar大鼠随机分为5组[7.5mg/ml纳米级SiO2组、1.5mg/ml纳米级SiO2组、7.5mg/ml微米级SiO2组、1.5mg/ml微米级SiO2组、对照组(生理盐水)],采用非暴露式气管内注入法,按1ml/kg体重染毒5周后,称重,计算睾丸、附睾的脏器系数,检测睾丸组织及血清中氧化和抗氧化指标[丙二醛(MDA)、超氧化物歧化酶(SOD)、还原型谷胱甘肽(GSH)、谷胱甘肽过氧化物酶(GSH-Px)]。结果各染毒组睾丸组织中,MDA、GSH含量均高于对照组,SOD、GSH-Px活力均低于对照组。7.5mg/ml纳米级SiO2组血清中,MDA含量高于对照组,差异有统计学意义(P<0.05);其余各组GSH含量和SOD、GSH-Px活力与对照组比较,差异均无统计学意义(P>0.05)。相同剂量纳米组与微米组各指标间比较,差异均无统计学意义(P>0.05)。结论微米和纳米级SiO2对大鼠睾丸组织产生氧化损伤作用;与微米级SiO2相比,纳米级SiO2的损伤作用更为严重。
Objective To study the oxidative damage on testis of male rats induced by micro-nano-scale SiO2. Methods Male Wistar rats were exposed to nanometer SiO2(20-40 nm) and micro-meter SiO2(1-10 μm)by intratracheal injection once two days. The rats were killed after 5 weeks of exposure. Some indicators related to the oxidative damage in the serum and the testis were determined. Results The activity of GSH-Px and SOD in the high dose groups decreased significantly and the MDA levels increased compared to the control group;The MDA levels of nano-silicon dioxide high dose group increased in the serum. Conclusion Nano-silicon dioxide may cause lipid peroxidation in the testis with a tendency of higher toxicity than that of micro-SiO2 at the same exposed level,the detail mechanism needs further discussion.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2007年第8期574-576,共3页
Journal of Environment and Health
基金
国家自然科学基金项目(90406024)
国家高技术研究发展规划(863)项目(2006AA03Z330)
