摘要
目的:探讨纳米硫化镉(Nano-Cd S)和硫化镉(Cd S)的雄性生殖毒性作用机制并比较其生殖毒性效应。方法:将36只SPF级雄性ICR小鼠随机分为对照组、Nano-Cd S组和Cd S组,每组各12只。两个染毒组经口灌胃染毒,每天灌胃1次,染毒剂量均为50 mg/kg,对照组给予等体积的生理盐水,连续45 d。采用石墨炉原子吸收光谱法检测小鼠睾丸组织中镉元素积累水平,显微镜下观察小鼠精子畸形率,采用酶联免疫吸附法(ELISA)检测小鼠血清睾酮水平,采用荧光实时定量PCR检测P450scc和P450-17αm RNA表达水平。结果:镉元素含量分析结果显示,Nano-Cd S和Cd S组小鼠睾丸组织中的镉元素含量分别为(425.46±73.89)和(183.59±32.46)ng/g,均高于对照组的(80.18±13.29)ng/g(P<0.05)。精子畸形率检测结果显示,Cd S组小鼠(2.28%)显著高于对照组(1.48%)(P<0.05),Nano-Cd S组(1.73%)也有所升高。ELISA检测结果显示,Nano-Cd S和Cd S组小鼠血清睾酮浓度分别为(12.31±1.10)和(15.88±5.41)ng/d L,均明显低于对照组的(68.41±11.36)ng/d L(P<0.05)。荧光实时定量PCR检测结果显示,Nano-Cd S和Cd S组P450scc m RNA的表达水平分别为0.50±0.11和0.84±0.48;P450-17αm RNA的表达水平分别为0.51±0.13和0.72±0.06,除Cd S组P450scc m RNA表达水平外,其他各组均明显低于对照组(P<0.05)。结论:Nano-Cd S和Cd S均能导致小鼠睾丸中镉元素的积累,一定程度上诱导精子畸形率的升高,并能显著降低血清睾酮水平以及抑制P450scc和P450-17αm RNA的表达水平。
OBJECTIVE:To compare the effects of normal cadmium sulfide (CdS) and Nano-CdS on the male reproductive system of mice,and to investigate the mechanisms of reproductive toxicity. METHODS:36 male ICR mice were randomly divided into control group,and two experimental groups which were exposed to 50 mg/kg Nano-CdS and CdS,respectively. Mice in control group were exposed to same volume of physiological saline . After 45 days,levels of cadmium accumulation in testis were determined directly by GF AAS. The rate of sperm abnormality was also calculated. Serum testosterone levels were measured by enzyme-linked immunosorbent assay (ELISA),expression levels of P450scc and P450-17α mRNA were determined by real-time PCR. RESULTS:Contents of cadmium in Nano-CdS and CdS groups were (425.46±73.89) and (183.59±32.46) ng/g,respectively,and were higher than the control (80.18±13.29) (P〈0.05). Sperm deformity rate in CdS group (2.28%) was significantly higher than the control (1.48%) (P〈0.05),Nano-CdS group (1.73%) was also increased. Concentrations of testosterone in CdS and Nano-CdS groups were(12.31±1.10) and (15.88±5.41) ng/dL,respectively,and were significantly lower than control group (68.41±11.36) ng/dL (P〈0.05). Expression levels of P450scc mRNA in Nano-CdS and CdS groups were (0.50±0.11) and (0.84±0.48),respectively, expression levels of P450-17αmRNA were (0.51±0.13) and (0.72±0.06),respectively. Except P450scc mRNA in CdS group,the mRNA expression levels in experimental groups were significantly lower than control group (P〈0.05). CONCLUSION:Content of cadmium accumulation in testis and sperm deformity rate were increased by exposure to Nano-CdS and CdS,with a significant reduction in serum testosterone levels and expression levels of P450scc and P450-17αmRNA.
出处
《癌变.畸变.突变》
CAS
CSCD
2014年第6期441-445,共5页
Carcinogenesis,Teratogenesis & Mutagenesis
基金
天津市应用基础与前沿技术研究计划项目(14JCYBJC29700)
天津市疾病预防控制中心科技基金项目(ZXPTJF-ZC-2014-DLS-002)