北京大学学报(医学版) ›› 2020, Vol. 52 ›› Issue (5): 821-827. doi: 10.19723/j.issn.1671-167X.2020.05.005
Di ZHOU,Zhang-jian CHEN,Gui-ping HU,Teng-long YAN,Chang-mao LONG,Hui-min FENG,Guang JIA()
摘要:
目的:评估纳米二氧化钛(titanium dioxide, TiO2)亚急性经口暴露对大鼠肝、小肠、大肠及血液等组织、脏器氧化/抗氧化生物标志和炎性因子的影响。方法:将24只4周龄清洁级Sprague Dawley(SD)雄性大鼠按体质量随机分为对照、低剂量、中剂量和高剂量4组,每组6只,以纳米TiO2每日灌胃,染毒剂量分别为0、2、10和50 mg/kg体质量,持续28 d。记录大鼠进食量、体质量和异常表现等一般情况,末次染毒后禁食12 h,取大鼠腹主动脉血,离心收集血清,取肝、小肠、大肠组织制备匀浆。采用酶联免疫吸附试验(enzyme linked immunosorbent assay, ELISA)及微板比色法测定氧化/抗氧化生物标志:总超氧化物歧化酶(superoxide dismutase, SOD)、还原型谷胱甘肽(glutathione, GSH)、谷胱甘肽过氧化物酶(glutathione peroxidase, GSH-Px)、总巯基(total mercapto, T-SH)、氧化型谷胱甘肽(glutathione disulfide, GSSG)和丙二醛(malomdialdehvde, MDA);测定炎性因子:白细胞介素-6(interleukin 6, IL-6)和肿瘤坏死因子-α(tumor necrosis factor alpha, TNF-α)。结果:与对照组相比,各组大鼠体质量、进食量、脏器系数均未见明显差异,血清、肝、小肠、大肠中GSH、GSH-Px、T-SH和IL-6无显著改变。与各自对照组相比,高剂量组大鼠血清中SOD活性显著上升,中、高剂量组小肠中GSSG浓度显著升高,低、高剂量组肝MDA浓度显著升高,中剂量组和高剂量组肝TNF-α浓度显著升高。结论:纳米TiO2亚急性经口暴露可造成大鼠血液组织抗氧化酶活性增加,肝和小肠氧化产物增加,肝脏炎性因子水平增高,肝对纳米TiO2经口暴露毒性最为敏感,随后依次为小肠和血液组织,大肠最不敏感。
中图分类号:
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