摘要
目的探讨石英对大鼠肺泡II型上皮细胞和成纤维细胞的增殖抑制及致hprt基因突变的差异。方法采用(MTT噻唑蓝)比色法检测大鼠肺成纤维细胞和肺泡II型上皮细胞的增殖抑制毒性。以含6-巯基鸟嘌呤(6-TG)的培养基筛选突变细胞克隆,检测hprt基因突变频率。结果在相同的染毒条件下,肺泡II型上皮细胞对石英刺激比成纤维细胞更易受损伤,上皮细胞半数增殖抑制浓度(IC50)约为140μg/cm2,成纤维细胞的IC50约为282μg/cm2。在致hprt基因突变方面,石英粉尘对两种细胞都有致突变作用。在同样剂量染毒条件下,肺泡Ⅱ型上皮细胞的hprt突变频率为84.2×10-6～156.6×10-6,较成纤维细胞(67.6×10-6～114.3×10-6)更容易发生hprt基因突变,差异有显著性(P<0.05)。结论石英对大鼠肺成纤维细胞和肺泡II型上皮细胞的细胞毒性及对hprt基因致突变作用强度存在明显差异。肺泡II型上皮细胞对石英刺激的反应敏感性高于成纤维细胞。
Objective To explore the differences of the silica-induced inhibition on cellular proliferation and hprt gene mutagenesis between lung fibroblasts and alveolar type II cells.Methods The proliferation in-hibitive cytotoxicity was detected by MTT(3-4,5-Dimethylthiazolzyl-2,5-Diphenyl Tetrazolium Bro mide)colori-metric method.Mutation in the hprt gene was screened by culture in the presence of the toxic purine analog,6-thioguanine(6-TG).Results Under the same circumstances of silica exposure,alveolar type II cells was more sensitive than lung fibroblasts for proliferation inhibition.The median proliferation inhibition concentration(IC 50 )of silica on epithelial was140μg/cm 2 ,whereas IC 50 of silica on fibroblasts was282μg/cm 2 .At the same doses of sili ca,the hprt gene mutation frequency in type II cells(84.2×10 -6 ～156.6×10 -6 )was statistically higher than that in fibroblasts(67.6×10 -6 ～114.3×10 -6 ,P<0.05).Con clu sion There were significant differences of both sili-ca-induced cell proliferation inhibition and hprt gene mutation between rat lung fibroblasts and type II epithelial cells.In vitro,cultured rat alveolar type II cells were more sensitive in cytotoxicity and hprt gene mutagenesis to silica dust than lung fibrob lasts were.[
出处
《中华劳动卫生职业病杂志》
CAS
CSCD
北大核心
2002年第3期177-179,共3页
Chinese Journal of Industrial Hygiene and Occupational Diseases
基金
国家自然科学基金资助项目(39870686)
