摘要
[目的]采用动式染尘控制系统建立大鼠矽肺模型。[方法]40只SD大鼠随机分为1d、3d、7d、2周、4周、8周、12周及对照组,每组5只;大鼠暴露的染尘浓度为170～190mg/m3,每天染尘2h,至各组相应的染尘时间段处死动物(对照组于12周末处死),称量体重与肺脏重量,计算肺脏器系数,检测肺组织羟脯氨酸(Hyp)含量并对肺组织进行病理组织学观察。[结果]染尘室浓度稳定持久。肺脏器系数随染尘时间延长而逐渐增加;1d组肺组织轻度充血、水肿;7d组血管周围可见较多炎细胞围绕,以单核细胞和淋巴细胞为主;2周组可见肺泡内有红染物及泡沫细胞;4周组巨噬细胞呈结节状,肺泡上皮细胞部分脱落,少量纤维组织增生;8周组纤维性增生更甚,同时可见肺泡II型上皮细胞腺管样增生;12周组出现纤维性结节,而对照组的大鼠肺部无明显异常。肺组织内Hyp含量随染尘时间延长而增加。[结论]采用动式染尘控制系统可建立大鼠矽肺模型。
[Objective]To establish a rat silicosis model by a dynamic silica dust exposure control system.[Methods] Forty SD rats were randomly divided into control group,and 1d,3d,7d,2-week,4-week,8-week,and 12-week groups,5 rats for each group.The rats were exposed to silica dust for 2h a day in a dynamic control system at the concentration of 170-190mg/m3.After the exposure,the animals were sacrificed according to the assigned group and the control group rats did after 12weeks.The body weight and lung weight were recorded to calculate lung/body coefficients.Hydroxy proline（Hyp） in the lung tissue was detected and pathological changes were observed.[Results]The concentration of silica dust in the exposure chamber was maintained stable.The lung coefficient gradually increased with the time of exposure.Mild congestion and edema were observed in the lung tissue in the 1d group;inflammatory cells around blood vessels were recorded in the 7d group,most of them were monocytes and lymphocytes.In the 2-week group,red dye and foam cells were found in the alveoli.In the 4-week group,dropped-off alveolar epithelial cells,phagocytes-formed nodules,and a small amount of fibrous tissue hyperplasia were identified.In the 8-week group,more fibrous hyperplasia were observed,plus the gland-like hyperplasia of type II alveolar epithelial cells.Fibrous nodules appeared in the 12-week group,and no abnormality in lung was identified in the control group.The level of Hyp in the lung tissue increased gradually along with the exposure duration to silica dust.[Conclusion]The rats silicosis model could be well established by the dynamic control system.
出处
《环境与职业医学》
CAS
北大核心
2013年第7期551-554,共4页
Journal of Environmental and Occupational Medicine
基金
教育部博士点基金(新教师)(编号:20100181120096)
四川省基础研究项目(编号:2011JY0019)
关键词
矽肺
动物模型
动式染毒
silicosis
animal model
dynamic exposure
